• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY The invention relates to a pneumatic percussion device (100, 200), comprising connecting means (156, 256) arranged for connection to a compressed air line (102, 202) of an external compressed air head, and according to percussion (105, 205), which percussion (105 , 205) comprises a percussion housing (210) and a percussion piston (230) arranged for forward and reciprocating movement in said percussion housing (210), which percussion piston (230) has a front piston portion (232) and a rear piston portion (236), in the percussion piston (230) and the percussion housing (210) together form a front space (240) and a rear space (250), used in said compressed air line (102, 202) arranged in air flow connection with the front space (240) via a second passage (242) in the percussion housing (210), at which second passage (242) a first valve member (246) is provided. The percussion piston (230) is designed so that a gap (260) is formed between the front piston portion (232) and the rear piston portion (236) and the percussion housing (210), arranged in guide means (280) are arranged to alternately be subjected to an air pressure of said rear space (250) and said intermediate space (260), respectively, during the forward and return movement of the percussion piston (230), and used in said control means (280) are arranged to control said first valve means (246) on the basis of said air pressure, in order to alternately supply compressed air to the front space (240) and effect a reciprocating movement of the percussion piston (230). The invention also relates to a method of a pneumatic percussion device (100, 200).
    公开号:SE1351298A1
    申请号:SE1351298
    申请日:2013-11-01
    公开日:2015-05-02
    发明作者:Thomas Lilja；Olof Östensson
    申请人:Tools Pc Ab Const；
    IPC主号:
    专利说明:

    TECHNICAL FIELD The present invention relates to a pneumatic percussion device. The invention also relates to a method of a pneumatic percussion device. 10 BACKGROUND Pneumatic percussion tools have existed for several decades and can be made of, for example, drilling machines with percussion effect, breaking machines or forming machines. The percussion tools can be operated by a operator by hand or arranged on a rig and they can be used vertically or horizontally.
    Regardless of the area of use, all percussion tools have in common that they include a percussion instrument with a percussion piston arranged in a percussion instrument housing. This is arranged for forward and return movement, by the influence of supplied compressed air. The percussion piston is moved forward by compressed air, and strikes at its forward position to an insert tool, such as a drill bit, a skewer or the like, and thus a carriage transfer is provided to the insert tool. After the impact on the insert tool, compressed air is supplied, so that the impact piston receives a recurring movement. The pressure build-up that takes place in the percussion device to accelerate and move the percussion piston generates reaction forces. These reaction forces affect the percussion housing and cause vibrations, which can be perceived as unpleasant for the operator. Today, there are restrictions on how much vibration an operator should be exposed to on a daily basis. Machines with high vibration levels can thus be used for a shorter time than machines with low vibration levels. It is undesirable to minimize the vibrations generated by the percussion tool and thus extend the time that an operator can work with the percussion tool without adverse effects. The vibrations of the percussion housing, the insert tool and venting of the compressed air also cause unwanted sound emissions, which can be perceived as disturbing the surroundings. Furthermore, the vibrations cause undesired fatigue loads on the percussion instrument.
    Various solutions to minimize the occurrence of vibrations and sound emissions exist on the market. According to a solution, the handle of the percussion tool is arranged with a spring suspension, which reduces the vibrations of the percussion tool. According to another solution, a sound-vaporizing housing is arranged around the percussion housing to reduce the sound emissions.
    Document SE383281 shows a percussion tool comprising a percussion piston movably arranged in a cylinder, which has a front and a rear cylinder space. In order to reduce the reaction forces arising from the percussion tool and the vibrations arising therefrom, compressed air is supplied with a substantially constant pressure to the rear cylinder space, which both accelerates the percussion piston forward and brakes the percussion piston as it moves backwards. Holes arranged at the percussion piston mean that pressurized air is fed to the front cylinder space and an accumulator chamber, which means that the percussion piston is moved backwards in the cylinder. Due to the limited size of the accumulator chamber, however, a pressure builds up in the front cylinder chamber during impact, which brakes the impact piston and impairs the impact action of the impact tool. The design of the percussion tool also entails throttling of the compressed air supply and thus the pressure drop when the percussion piston is to be accelerated. The pressure drops generate heat, which medic & a pre-assembled efficiency has the percussion tool.
    Despite well-known solutions in the field, there is a need to provide an ergonomic percussion tool that exhibits minimal vibration and sound emissions while generating the required impact force. SUMMARY OF THE INVENTION An object of the present invention is to provide a percussion device which minimizes the occurrence of vibrations.
    Another object of the invention is to provide a percussion device which is medic & minimal with sound emissions.
    Another object of the invention is to provide a percussion device which is ergonomic and user-friendly.
    A further object of the invention is to provide a percussion device which exhibits a high efficiency.
    Another object of the invention is to provide a percussion device which exhibits an optimum percussion energy.
    A further object of the invention is to provide a percussion device which entails a high machining shape.
    A further object of the invention is to provide a method of percussion device which involves minimal vibrations and sound emissions.
    A further object of the invention is to provide an alternative percussion device and an alternative method of a percussion device.
    Some of these objects are achieved with a pneumatic percussion device according to claim 1. Other jams are achieved with a method according to claim 12. Advantageous embodiments are stated in the dependent claims.
    According to an aspect of the invention, there is provided a pneumatic percussion device, comprising connecting means arranged for connection to a compressed air line of an external compressed air head, and a percussion instrument, which percussion instrument comprises a percussion housing and a percussion piston arranged for forward and reciprocating movement in said percussion piston housing. a front piston portion and a rear piston portion, where the front piston portion acts on an insert tool arranged with the percussion device, used in the percussion piston and the percussion housing together form a front space and a rear space, where the front space is delimited behind the front piston portion and the rear space is delimited forward of the rear piston portion, vane in said compressed air line is arranged in air flow connection with the rear space via a first passage in the percussion housing, and vane in said compressed air duct is arranged in liquefaction connection with the front space via a second passage in the percussion housing, in which other a first valve means is arranged, a vane in the percussion piston is designed so that a gap is formed between the front piston portion and the rear piston portion and the percussion housing, vane control means are arranged to alternately be subjected to an air pressure of said rear space and said intermediate space movement, and vane in said guide means are arranged to control said first valve means on the basis of said air pressure, in order alternately to supply compressed air to the front space and to provide a return movement of the percussion piston.
    The air pressure of the intermediate space preferably differs Than the air pressure of the rear space. The compressed air supplied to the rear space acts on the percussion piston so that it moves forward in the percussion housing. When the percussion piston reaches a forward position, the front piston portion of the insert tool strikes, resulting in an energy transfer. The compressed air supplied to the front space acts on the percussion piston so that it moves backwards in the percussion housing. By controlling the first valve means by means of control means on the basis of the air pressure of the rear space and the intermediate space, respectively, an optimal control of the supply of compressed air in the front space is obtained. In this way a percussion device is provided, which exhibits a high machining capacity and a high efficiency.
    Preferably, compressed air is fed into the rear space constantly using the percussion device of the present invention. In this way, a substantially constant air pressure acts on the rear piston portion, both with forward movement and backward movement of the percussion piston. By creating a substantially constant pressure in the rear space, the reaction forces acting on the percussion housing are reduced. In this way, a percussion device can be provided which minimizes the occurrence of vibrations.
    Valve means is defined as a means used to regulate or control an opening in a fluid system and thereby control the flow of gas or liquid. The valve means in the present invention can be constituted by a variety of valve types, for example a solenoid valve, ball valve, 3/2 valve or the like.
    According to one aspect of the present invention, the percussion housing is formed as a cylinder and has a front portion and a rear portion, the vane of the front portion having a larger inner diameter than the rear portion. At the diameter transition between the front portion and the rear portion, an abutment surface is formed. The contact surface can act as a mechanical stop for rearward movement of the percussion piston when the percussion device is switched off. Alternatively, said mechanical stop can be provided by the rear piston portion striking the rear end of the percussion housing.
    The percussion device preferably comprises a front piece with a bushing for connecting the insert tool to the percussion device. The front piece is aptly designed integrated with the front part of the percussion housing. Alternatively, the front piece is releasably arranged at the front portion of the percussion housing.
    At the rear part of the percussion housing the handles of the percussion device are preferably arranged. The handles can be arranged with a vibration-damping spring suspension, which further reduces the vibrations to which the operator is exposed. The handles may further be formed with a T-shape, D-shape, as a pistol grip or the like. In order to reduce the sound emissions emitted by the percussion device, a sound-damping housing is preferably arranged around the percussion housing. The sound-absorbing housing vaporizes both metallic sound emissions and sound emissions Than vent passages of the percussion device.
    According to one aspect of the present invention, the percussion piston is a differential piston, having different areas exposed to pressure.
    According to one aspect of the present invention, the percussion piston is designed so that the front piston portion comprises a first part and a second part, the first part having a large diameter of the second part. The second part of the front piston portion is arranged at the front of the percussion piston and closest to the insert tool. The first part of the front piston portion has substantially the same diameter as the inner diameter of the front portion of the percussion housing. The front space is thus bounded backwards by the first part of the front piston portion 20. The rear piston portion has a smaller diameter than the first part of the front piston portion. The rear piston portion has substantially the same diameter as the inner diameter of the rear portion of the percussion housing. Extending between the front piston portion and the rear piston portion is suitably a middle portion, which has a smaller diameter than the front part of the front piston portion and the rear piston portion.
    Preferably, the percussion piston is so designed that a percussion device is provided which results in a high machining capacity. Upon impact of the percussion piston on the insert tool, a shock wave is generated which generates a local compression of the insert tool. The voltage in the insert tool thus varies over time.
    The impact wagon is affected by the geometric shape of the percussion piston. A long piston of small diameter generates a shock wave with a low voltage level that operates for a long time. A short impact piston with a large diameter generates a shock wave with a high voltage level for a short time. When the percussion device is used in breaking applications, a certain lowest voltage level is required to break through the substrate. Too high a voltage level, however, wears out on the insert tool and thus short the service life of the insert tool. The percussion piston of the present invention is preferably formed with a longitudinal diameter ratio which results in a shock wave with a somewhat lower voltage level for a long time, compared to prior art.
    According to one aspect of the present invention, the front space, the intermediate space and the rear space are separated and recessed by circumferential gap seals between the front part of the front piston portion and the percussion housing and between the rear piston portion and the percussion housing. The clearance between the percussion piston and the percussion housing is suitably less than 60 micrometers.
    By using gap sealing, the friction between the percussion piston and the percussion housing is minimized. In this way, a percussion device is provided, which exhibits an optimized percussion effect.
    Alternatively, the front space, the intermediate space and the rear space 20 are separated and tapered by sealing means, for example O-rings or piston rings, arranged between the front part of the front piston portion and the percussion housing and between the rear piston portion and the percussion housing.
    According to one aspect of the present invention, the percussion device comprises a first vent passage arranged at said percussion housing, for maintaining atmospheric pressure at said intermediate space. Because the intermediate space is in constant connection with the atmosphere, the control means will be exposed to atmospheric pressure when the percussion piston is in such a position that the control means are in connection with the intermediate space. When the percussion piston is in such a position that the control means are in connection with the rear space, the control means are exposed to an air pressure which corresponds to the pressure of the compressed air supplied to the rear space. 8 The compressed air supplied to the rear space and the front space from the compressed air line has, for example, a pressure between 5-30 bar.
    According to one aspect of the present invention, the intermediate space exhibits an air pressure adjacent to atmospheric pressure. Alternatively, the intermediate space has an air pressure which differs from the atmospheric pressure and which differs from the air pressure in the rear space. The air pressure of the intermediate space is, for example, lower than the air pressure of the rear space.
    According to an aspect of the present invention, the control means comprise a control passage arranged at the percussion housing and a control line arranged between the control passage and the first valve means.
    According to one aspect of the present invention, the first valve means comprises a mechanically controlled valve with a first resting layer and a controlled second layer. The first valve means may comprise a spring device, which means that the first valve means in the resting layer is closed, and that the first valve means is opened under the influence of the spring device. The spring device may comprise a mechanical spring or an air spring. When the control passage is in communication with the rear space, it flows to the rear space supplying the compressed air via the control passage into the control line. The pressure in the control line 6 thus increases and acts on the mechanically controlled valve so that it switches to its second open bearing. When the percussion piston is in such a position that the guide passage is in communication with the intermediate space connected to the atmosphere, the pressure in the guide line decreases and the first valve member returns to its closed resting layer. Alternatively, the tip of the first valve member is in the resting layer and the rod in the second controlled layer.
    Alternatively, the first valve member consists of a mechanically controlled valve with a first controlled bearing and then a second controlled bearing. When the guide passage is connected to the rear space, it flows to the rear space supplying the compressed air 9 via the guide passage into the guide line. The pressure in the control line thus increases and the mechanically controlled valve is controlled to the first layer, so that it is opened. When the percussion piston is in such a position that the guide passage is connected to the intermediate space connected to the atmosphere, the pressure in the guide line drops and the first valve member is guided to the second closed layer.
    Alternatively, a guide means is also arranged at the percussion housing, so that it is in communication with the front space and the intermediate space, respectively, depending on the position of the percussion piston in the percussion housing. In this case, control of the first valve means with two separate control means, to a controlled open bearing and a controlled rod bearing, is possible.
    Alternatively, the control means comprise a pressure sensor arranged at the percussion housing and an electrical line arranged between the pressure sensor and the first valve means.
    Alternatively, the first valve member is an electrically controlled valve. When the pressure sensor is in communication with the rear space, the pressure sensor is exposed to an air pressure corresponding to the pressure of the compressed air supplied to the rear space. The pressure sensor then sends a first electrical signal via the electrical line to the first valve member, which is thus controlled to an open position. When the percussion piston is in such a position that the pressure sensor is in connection with the intermediate space, the pressure sensor is exposed to the air pressure of the intermediate space. The pressure sensor then sends a second signal to the electrically controlled valve, which is armed controlled to a rod bearing.
    According to an aspect of the present invention, the percussion device comprises a second vent passage, arranged at the percussion housing so that it communicates with the front space when the control means are in communication with the intermediate space. By arranging the second vent passage and the control means in relation to each other, so that the second vent passage can only be in connection with the front space when the control means are in connection with the intermediate drain and the first valve means is closed, it is avoided that the front space is vented as compressed air. is added to the front space. The percussion device is thus designed so that the front piston portion, when the percussion piston baked in the percussion housing is moved, has never passed the second vent passage before the rear piston portion has passed the control means. The first valve member and its guide are designed so that venting of the front space is slowed down in the forward movement of the percussion piston, so as not to slow down the forward movement of the percussion piston. In this way, a percussion device can be provided, which exhibits an optimal percussion energy.
    According to one aspect of the present invention, the second vent passage is arranged so far back of the percussion housing that the rear piston portion upon movement back in the percussion housing passes the control means before the front piston portion has passed the second vent passage. When the rear piston portion has passed the guide means, the first valve means is closed and the supply of compressed air into the front space is stopped. However, the already existing compressed air in the front space and the kinetic energy of the percussion piston means that the percussion piston continues to be moved backwards for some time after the first valve member has been closed. When the kinetic energy of the percussion piston 20 ceases and the substantially constant pressure in the rear space brakes the percussion piston, the percussion piston has been moved so far back that the second vent passage is in communication with the front space. Thereby, the front space is vented only after the energy of the air in the front space has been utilized to the maximum. In this way a percussion device is provided, which has a high efficiency. Because the air that is released into the front space has a pressure of atmospheric pressure, the sound emissions emitted by the percussion device are also reduced.
    Alternatively, the front space can be vented only through the first valve member, so as not to slow down the forward movement of the percussion piston. Alternatively, the percussion device comprises a plurality of vent passages, the vent passages being constituted by openings in the percussion housing, arranged at several different axial levels and / or surrounding the perimeter of the percussion housing.
    According to one aspect of the present invention, the percussion device comprises a supply line arranged in air flow connection with the compressed air line and the first valve means.
    According to one aspect of the present invention, the connecting means of the percussion device comprises a second valve means, arranged in connection with the compressed air line for regulating the supply of pressurized air. The second valve means is preferably arranged in connection with the supply line and the first passage. By arranging a second valve means in connection with the compressed air line, control of the compressed air flow from the compressed air line is achieved by both the first passage into the rear space and through the supply line to the first valve means.
    The second valve member is preferably a ball valve or the like and according to one aspect of the present invention is constant when the percussion device is in operation. This provides a substantially constant pressure of the rear space, which results in a substantially constant acceleration of the percussion piston. In the same way, the supply line is constantly pressurized when the percussion device is in operation. Pressure build-up which takes place in the percussion housing of conventional percussion devices at the rear water layer of the percussion piston entails as great reaction forces on the percussion housing as the pressure on the percussion piston. These reaction forces cause vibrations in the percussion housing. Because the second valve member is constant Open, the compressed air line acts as an accumulator when the percussion piston is moved backwards and the rear space is compressed. In order not to slow down the air in the rear space, the air in the rear space must be slowed down, and in order to reduce the pressure build-up in the rear space, the air in the rear space must be transferred to the accumulator as the piston moves backwards. When the percussion piston is pushed backwards in the percussion housing, the air in the rear space is thus forced into the compressed air line again. Since the accumulator in the form of the compressed air line has a much larger volume than the rear space, the accumulator can reduce the pressure build-up in the percussion and a substantially constant pressure of the rear space is obtained. This minimizes the reaction forces during acceleration of the piston in forward motion. In this way a percussion device is provided, which causes minimal vibration. Because the second valve member is constantly open during operation of the percussion device, air throttling which causes a drop in pressure when accelerating the percussion piston is also avoided. In this way a percussion device is provided, which shows a high efficiency.
    Alternatively, the connecting means of the percussion device comprises a connection for direct connection of the compressed air line to the first passage. In this way, compressed air is supplied to the rear space when the external pressure source is activated and begins to generate compressed air. To stop the supply of compressed air in the rear space, the external pressure source ay is shut off.
    According to one aspect of the present invention, the percussion device is switched off by interrupting the supply of compressed air to the percussion housing. Bleeding of the percussion housing is preferably achieved in true band with the supply of compressed air being stopped. Alternatively, the percussion device is switched off by interrupting the supply of compressed air to the rear space. Alternatively, the percussion device 25 can be switched off by blocking the control line, or blocking the vent passages. Alternatively, the percussion device can be switched off by stopping the supply of compressed air to the front space at the same time as venting of the front space is effected. When using a percussion device, a feed force is required to counteract the reaction forces generated. The feed force is, for example, the force that an operator can apply to the percussion device. In cases where the percussion device is used vertically downwards, the dead weight of the percussion device also forms part of the natural force. In order to provide an ergonomic and user-friendly percussion device, it is undesirable to reduce the required feed force that an operator must supply. The higher the power of the percussion device, the greater the feed force required.
    According to one aspect of the present invention, the percussion device comprises an external feed force skull, such as a robot, rig, hydraulic or pneumatic feed leg or the like.
    According to one aspect of the present invention, the second valve means comprises a venting function. When the second valve member has been closed, the rear space is vented through the vent function to minimize the amount of compressed air in the rear space at the next start of the percussion device. By venting the rear space, the demand for feed force is minimized at the usual start-up of the percussion device. Alternatively, the percussion device comprises a separate venting device arranged at the first passage for venting the rear space when the second valve member is closed. In this way a percussion device is provided, which is ergonomic and user-friendly.
    According to one aspect of the present invention, the percussion device comprises an actuating means arranged in connection with the second valve means, for manually effecting opening / closing of the second valve means. The actuating means may be a tap, which is turned manually to open and close the second valve means, respectively.
    According to an exemplary embodiment, the actuator is constituted by a servo valve. The servo valve can also be called a pilot valve. The servo valve entails a servo control of the second valve member, which facilitates the operation of the percussion device. The second valve member is subjected to a high pressure and the large river and bar, so as not to reduce the pressure, are formed with large conduit areas. Manually opening and closing the second valve member would therefore require great maneuvering power. The servo valve regulates a limited air flock, which is connected to the second valve member. The restricted air flow affects the second valve member so that it is opened or closed. In this way, minimal maneuvering power is required to activate / start the percussion device 5 and thus a percussion device is provided which is ergonomic and user-friendly.
    According to one aspect of the present invention, the percussion device comprises a venting device arranged for venting the outer space. In the case where the percussion device comprises a second deaeration passage, the front space is deaerated when the percussion piston is in such a position that the second deaeration passage is in communication with the front space. When the percussion piston has been moved forward and past the second venting passage so that the second venting passage is in communication with the intermediate space, the front space is preferably vented through a venting device.
    When the percussion piston is moved forward in the direction of impact, the front space is compressed and thus the air in the front space is also compressed. The compressed air can slow down the movement of the percussion piston forward. By venting the front space through the venting device during the forward movement of the percussion piston, the braking effect on the percussion piston is reduced. In this way, a percussion device is provided, which exhibits an optimal percussion energy.
    The venting device may preferably form part of the first valve means. Alternatively, the venting device consists of a separate unit arranged at the second passage. In the case where the venting device forms part of the first valve member, the first valve member is preferably designed so that the closed layer of the first valve member means that the venting device is open and deaerates the front space. In this way, the front space is vented as long as the first valve member is closed. The front space can thus be vented either through the second vent passage and the vent device, only through the second vent passage or only through the vent device.
    According to one aspect of the present invention, the percussion device comprises an intermediate block arranged between the insert tool connected to the percussion device and the front piston of the percussion piston. The front piston portion thus strikes the intermediate block at a forward position of the percussion piston. The kinetic energy of the percussion piston is transferred through the intermediate block to the insert tool, which thus receives an energy input. The intermediate block picks up reflectors from the insert tool 10 as the feed force is too high. In this way, the load on the insert tool is reduced. Furthermore, the intermediate block prevents dirt from penetrating into the front space of the percussion housing.
    Alternatively, the intermediate block is excluded and the front piston portion strikes directly on the insert tool. A sealing device is then arranged between the insert tool and the bushing. This ensures pressure build-up in the front space.
    According to one aspect of the present invention, the percussion device comprises a rotation mechanism for rotation of the insert tool. Rotation of the insert tool is preferably achieved by a rotation of the bushing in which the insert tool is arranged at the front piece of the percussion device. The rotation mechanism may comprise an external drive unit arranged at the percussion device. The external drive unit can, for example, consist of an electric motor, a hydraulic motor or a pneumatic motor. Alternatively, the rotation mechanism comprises so-called splines of the bushing and / or percussion piston, so that the rotation is effected by the reciprocating motion of the percussion piston.
    According to one aspect of the present invention, the pneumatic percussion device is the handheld. Alternatively, a carrier of the percussion device is mechanized. According to one aspect of the present invention, there is provided a vehicle equipped with the pneumatic percussion device. According to one aspect of the present invention, there is provided a rig, for example a drilling rig, equipped with the pneumatic percussion device. According to one aspect of the present invention, there is provided a stationary platform equipped with the pneumatic percussion device.
    According to one aspect of the present invention there is provided a method of a pneumatic percussion device, comprising connecting means arranged for connection to a compressed air line of an external compressed air head, and a percussion instrument, which percussion instrument comprises a percussion housing and a percussion piston arranged for forward and reciprocating movement in said percussion housing. , which percussion piston has a front piston portion and a rear piston portion, where the front piston portion acts on an insert tool arranged with the percussion device, used in the percussion piston and the percussion housing together form a front space and a rear space, where the front space is delimited baked by the front piston parity and the rear space is delimited at the front by the rear piston portion, the van in said compressed air line is arranged in air flow connection with the rear space via a first passage in the percussion housing, and the van in said compressed air line is arranged in air flow connection with the front space via a second passage in the percussion housing, in which second passage a first valve means is arranged, used in the method comprises the step of: - controlling the first valve means by means of control means, arranged to alternately be exposed to an air pressure of said rear space and an intermediate space formed between the percussion housing, the front piston portion and the the rear piston portion, in the forward and return movement of the percussion piston, used in the control means, control the said first valve means on the basis of said air pressure.
    According to one aspect of the present invention, there is provided a method of a pneumatic percussion device, comprising a compressed air line connected to a compressed air head and a percussion device having a percussion piston movably arranged in a percussion housing, which has a front piston portion and a rear piston portion 17 vane in the percussion piston and percussion housing together form a front space and a rear space, where the front space is delimited behind by the front piston parity and the rear space is delimited forward by the rear piston portion, the vane in the compressed air line is arranged in connection with a first passage arranged at the rear space and a in the front space arranged second passage, in which second passage a first valve means is arranged, usual in the method comprises the steps of: starting the percussion device; effect a movement of the percussion piston away from the percussion housing, by supplying compressed air via the first passage to the rear space; effecting a movement of the percussion piston baked in the percussion housing, by supplying compressed air via the first valve means and the second passage to the front space; and rod of the percussion device.
    According to one aspect of the present invention, the method comprises the step of starting the percussion device by activating the supply of compressed air to the rear space of the percussion housing. Activation of the supply of compressed air to the rear space is preferably achieved by an operator manually activating an innovation means, arranged in connection with a second valve means, which second valve means is arranged in connection with the compressed air line and the rear space. Through the maneuvering, the second valve member is opened and compressed air can flow into the rear space. The second valve means is suitably tipped the whole time the actuator is activated. In this way a substantially constant pressure is applied to the rear space during operation of the percussion device.
    According to one aspect of the present invention, the method comprises the step of effecting a reciprocating movement of the percussion piston, by controlling the first valve member so that it is opened and compressed air is supplied to the front space.
    The compressed air in the rear compartment presses substantially constantly on the rear piston portion so that the percussion piston moves forward. When the rear piston portion has passed 18 control means arranged at the percussion housing, so that the control means are in communication with the rear space and are subjected to the pressure in the rear space, the first valve means is controlled to an open bearing. When the first valve member is tipped, compressed air can be supplied to the front space via the compressed air line. In this way a pressure build-up is achieved in the front space, which pressure acts on the front piston part, so that the percussion piston is moved backwards in the percussion housing.
    According to one aspect of the present invention, the method comprises the step of controlling the reciprocating movement of the percussion piston, by controlling the first valve means so that it is shut off and the supply of compressed air to the front space is stopped. When the rear piston portion in its movement has passed the guide means, so that the guide means is in communication with a gap formed between the percussion housing, the front piston portion and the rear piston portion, and the arm is subjected to the pressure in the intermediate space, the first valve member is guided to a closed bearing. The interspace is preferably connected to the atmosphere. Alternatively, the intermediate space has an air pressure that differs from the atmospheric pressure and from the air pressure of the rear space. The air pressure of the intermediate space is preferably lower than the air pressure of the rear space. When the first valve member has been closed, the percussion piston continues to move backwards in the percussion housing by means of its own agitation energy, until the pressure of the rear space completely slows down the rearward movement of the percussion piston.
    According to one aspect of the present invention, the method comprises the step of venting the front space when the first valve member is closed, in order to minimize the braking effect when the percussion piston obtains a forward movement.
    According to one aspect of the present invention, the method comprises the step of switching off the percussion device by stopping the supply of compressed air to the percussion housing. Preferably, the percussion device is switched off by stopping the supply of compressed air to the rear space. Alternatively, the percussion device 19 can be switched off by blocking a vent line connected to the first valve means, or by means of venting passages arranged at the percussion housing. Alternatively, the percussion device can be switched off by stopping the supply of compressed air to the front space at the same time as venting of the front space is effected.
    According to one aspect of the present invention, the method comprises the step of venting the rear space when the percussion device is turned off. The rear space is vented, for example, by means of a venting function of the second valve member. Alternatively, the rear space is vented by means of a separate venting device.
    According to one aspect of the present invention, the method comprises venting the front space when the percussion device is turned off.
    Additional objects, advantages and novel features of the present invention will become apparent to those skilled in the art from the following details, as well as through the practice of the invention. While the invention is described below, it should be understood that the invention is not limited to the specific details described. Those skilled in the art having access to laroma hari will recognize additional applications, modifications, and embodiments in other fields which are within the scope of the invention. SUMMARY DESCRIPTION OF THE DRAWINGS For a more complete understanding of the present invention and further objects and advantages thereof, reference is now made to the following detailed description which is to be read in conjunction with the accompanying drawings in which like reference numerals refer to like parts in the various figures, and in which: Figure 1 schematically illustrates a percussion device, according to an embodiment of the invention; Figure 2 schematically illustrates a cross-sectional view of a percussion instrument of a percussion device, according to an embodiment of the invention; Figure 3a schematically illustrates a flow chart of a process, according to an embodiment of the invention; and Figure 3b schematically illustrates in further detail a flow chart of a method, according to an embodiment of the invention; DETAILED DESCRIPTION OF THE FIGURES When describing the figures, position concepts such as front, rear, front and rear are named. Forward is defined as a direction in the direction of impact, and thus baked as a direction opposite to the direction of impact.
    Figure 1 schematically illustrates a percussion device 100 according to an embodiment of the present invention. The percussion device 100 comprises T-shaped handles 126, a percussion device 105 and connecting means 156 for connection to a compressed air line 102 of an external pressure source (not shown). The percussion unit 10 comprises a percussion housing (not shown), a percussion piston (not shown) movably arranged at the percussion housing, and a front piece 120 for connecting an insert tool 124 to the percussion unit 105. In this embodiment the front piece 120 is integrated with the percussion housing and comprises a bushing / sleeve (not shown) for fitting with the insertion tool 124. The percussion piston can be moved axially along the extent of the percussion housing and strikes in a forward position to the insertion tool 124, which mediates an energy transfer to the insertion tool 124. The pressure source, which supplies compressed air to the percussion device, a compressor. The percussion device 100 also comprises a sound-absorbing housing 123, arranged around the percussion device 105.
    Figure 2 schematically shows a cross-sectional view of a percussion device 200 according to an embodiment of the present invention. The percussion device 200 comprises a percussion device 205. The percussion device 205 in turn comprises a percussion housing 210, in which a percussion piston 230 is arranged for a reciprocating movement along the extent of the percussion housing 210. The percussion housing 210 is designed as a cylinder and has a front portion 212 and a rear portion 214, used in the front portion 212 having a larger inner diameter and thus a larger exposed area of the rear portion 214. At the diameter transition between the front portion 212 and the abutment portion 214 forms an abutment surface 216. Integrated with the front portion 212 of the percussion housing 210 is a front piece 220 with a bushing 222 provided for connecting an insert tool 224 to the percussion device 200. At the rear portion 214 of the percussion housing 210 the handles 226 of the percussion device 200 are arranged . Between the percussion housing 210 and the front piece 220, an intermediate block 228 is arranged. When the percussion piston 230 moves forward to a front position, the percussion piston 230 strikes to the intermediate block 228. The intermediate block 228 thereby transfers the kinetic energy of the percussion piston 230 to the insert tool 224. The intermediate block 228 also prevents dirt from entering the percussion housing 210.
    The percussion piston 230 is formed with a front piston portion 232 and a rear piston portion 236, and a middle portion 238 extending therebetween. The front piston portion 232 acts at the front position of the percussion piston 230 on the insert tool 224 connected to the percussion device 200, so that an energy transfer is provided to the insert 22. The front piston portion 232 includes a first portion 233 and a second portion 234, the first portion 233 having a large diameter of the second portion 234. The second portion 234 of the front piston portion 232 is the portion abutting the intermediate block 228 upon impact. The first part 233 of the front piston portion 232 has substantially the same diameter as the inner diameter of the front portion 212 of the front of the percussion housing 210. The front piston portion 232 thus forms a front space 240 together with the percussion housing 210. The front space 240 is thus delimited backwards by the first part 233 of the front piston portion 232, and forward by the intermediate block 228 and the percussion housing 210. The rear piston portion 236 has a smaller diameter than the the first part 233 of the front piston portion 232. The rear piston portion 22 236 has substantially the same diameter as the inner diameters of the rear portion 214 of the rear portion of the percussion housing 210. The rear piston portion 236 forms a rear space 250 together with the percussion housing 210. The middle portion 238 of the percussion piston 230 has a smaller diameter than the front portion 233 of the front piston portion 232 and the rear piston portion 236, so that a gap 260 is formed between the percussion housing 210, the front the piston portion 232 and the rear piston portion 236. The front space 240, the intermediate space 260 and the rear space 250 are separated and tapered by slits 270 radially between the front portion 233 of the front piston portion 232 and the percussion housing 2 and between the rear piston portion 236 and the percussion housing 210. 270 between the percussion piston 230 and the percussion housing 210 is between 10-60 micrometers. By using gap seal 270, the friction between the percussion piston 230 and the percussion housing 210 is minimized. In this way, a percussion device 200 is provided, which has an optimized percussion effect.
    The percussion device 200 further comprises connecting means 256 for connection to a compressed air line 202 of an external compressed air head (not shown). The compressed air line 202, in the form of a hose, is arranged in air flow connection with the rear space 250 of the percussion housing 210 via a first passage 252 in the percussion housing 210 and the front space 240 of the percussion housing 210 via a second passage 242. At the second passage 242 a first valve means 246 arranged. The first valve means 246 is arranged to control the supply of pressurized air to the front space 240 via the second passage 242. The connecting means 256 comprise a second valve means 257 arranged to regulate the air flow between the compressed air line 202 and the rear space 250. Furthermore, a maneuvering means 258 in the form of a servo valve arranged in connection with the second valve member 257. The servo valve 258 is actuated manually by an operator, via for example a button, a control or the like (not shown), and in this way a servo control of the second valve member 257 is provided. By activating the servo valve 258, the second valve member 257 is opened and the percussion device 200 is started. When the servo valve 258 is deactivated, the second valve member 23 257 is closed and the percussion device 200 is stopped. As long as the servo valve 258 is activated, the second valve means 257 is kept open and compressed air is constantly supplied to the rear space 250 when using the percussion device 200. Between the second valve means 257 and the first valve means 246 a supply line 272 is further arranged, for feeding compressed air from the compressed air line 202 to the front space 240. When the servo valve 258 is activated and the second valve member 257 is open, the supply line 272 is substantially constantly pressurized. Furthermore, the percussion device 200 comprises control means 280 for controlling the first valve means 246 and thereby controlling the supply of compressed air to the front space 240. The control means 280 comprise a control passage 282 of the percussion housing 210 saint one between the control passage 282 and the first valve means 246 connected control line 284. Control line 284 consists of a hose. The guide passage 282 is arranged so that it alternates in connection with the rear space 250 and the intermediate space 260, respectively, depending on the position of the percussion piston 230 in the percussion housing 210. In this way, the guide passage 282 and the armed guide line 284 are alternately exposed to air pressure at the rear space 250 and air pressure of the intermediate space 260 at the reciprocating movement of the percussion piston 230, respectively. The first valve means 246 is controlled based on the air pressure to which the control means 280 is subjected.
    A first vent passage 290 is provided with the percussion housing 210 so that the intermediate space 260 is constantly connected to the air hazard. In this way, an atmospheric pressure was maintained in the intermediate space 260, regardless of the position of the percussion piston 230.
    A second vent passage 292 is further provided with the percussion housing 30 210 so that it communicates with the front space 240 only when the control means 280 is in communication with the intermediate space 260. 24 When an operator activates the servo valve 258, the second valve means 257 is opened, so that compressed air freely can flow between the compressed air line 202 and the rear space 250, via the first passage 252. The pressurized air in the rear space 250 acts on the rear piston portion 236 so that the piston 2 is pushed forward in the direction of impact. When the rear piston portion 236 has passed the guide passage 282 (as shown in the figure), the compressed air of the rear space flows into the guide line 284. The air in the guide line 284 then has the same pressure as the air of the rear space 250. The first valve member 246 is a mechanically controlled 3/2 valve that has a first rod resting bearing and a second controlled open bearing. In the resting layer, the valve 246 is closed against the front space 240 so that no compressed air can be supplied to the front space 240. The valve 246 comprises a venting device 248 in that in the resting layer it is also connected to the atmosphere. The rest layer thus means that the front space 240 is vented. When the pressure in the control line 284 increases to the same pressure as in the rear space 250, the compressed air directs the first valve member 246 to its second position. The controlled second layer means that the valve 246 is open to the front space 240 and the compressed air in the supply line 272 can be supplied to the front space 240 via the second passage 242. The location of the guide passage 282 is adapted so that the first valve member 246 does not switch and open. before the percussion piston 230 has reached the insert tool 224.
    When the first valve member 246 is open, the front space 240 is filled with compressed air at the same time as the rear space 250 is constantly supplied with compressed air. As the front part 233 of the front piston portion 232 has a larger diameter, and the armed area, of the rear piston portion 236, the percussion piston 230 is pressed back into the percussion housing 210. The volume of the rear space 250 thereby decreases and the air in the rear space 250 flows. thanks to the constantly open second valve means 257 back into the compressed air line 202 which in this way acts as an accumulator. The accumulator in the form of the compressed air line 202 is so much larger than the rear space 250 that the rear space 250 obtains a substantially constant pressure and thus a substantially constant acceleration of the percussion piston 230 is achieved both in its forward and reciprocating movement. The substantially constant pressure causes substantially constant reaction forces and thus minimizes the vibrations in the percussion 205.
    The percussion piston 230 is thus moved backwards in the percussion housing 210 and when the rear piston portion 236 has passed past the guide passage 282 the guide passage 282 and the guide line 284 in connection with the intermediate space 260 instead of the rear space 250. The intermediate clearance 260 is constantly connected to the atmosphere via the first vent passage 290, which causes the compressed air in the control line 284 to flow out to the atmosphere and the pressure in the control line 284 is substantially reduced to atmospheric pressure. When the pressure in the control line 284 is reduced, the first valve member 246 returns to its closed resting position and the supply of compressed air to the front space 2 is stopped. However, the percussion piston 230 is moved backwards in the percussion housing 210 as long as the energy of the air in the front space 240 and the kinetic energy in the percussion piston 230 is large than the pressure on the rear piston portion 236 in the rear space 250. Finally, the percussion piston 230 is moved backwards so far that the first part 233 of the front piston portion 232 is positioned behind the second vent passage 292, so that the second vent passage 292 communicates with the front space 240. In this way, the front space 240 is vented through the second vent passage 292. The air discharged through the second the vent passage 292 thus has a relatively low pressure and thus contains a lower energy. In this way, the sound emissions from the percussion device 200 are reduced and a high efficiency is obtained. When the compressed air in the rear space 250 acts on the percussion piston 230 and the percussion piston 230 is moved forward, the front space 240 is compressed. Because the front space 240 has been vented via the second vent passage 292, there is essentially no pressurized air which greatly slows the stroke of the percussion piston 230. The front space 240 is further vented via the venting device 248 of the first valve member 246 all the time the first valve member 246 is in its closed rest position, which 26 further reduces the braking of the forward piston 230. By designing the percussion device 200 according to the present invention, an optimal timing between the position of the percussion piston 230 and control of compressed air supply in the front space 240 is achieved, thus mechanical stopping of the percussion piston 230 when the percussion device 200 is in use is avoided.
    To shut off the percussion device 200, the servo valve 258 is deactivated and the second valve member 257 is closed. By throttling all supply of compressed air to the percussion device 200 during shutdown, the internal lacquer is minimized when the percussion device 200 is shut off. The second valve member 257 includes a vent function. Thus, when the second valve member 257 has been closed, the rear space 250 is vented through the vent function to minimize the amount of compressed air in the rear space 250 at the next start of the percussion device 200. By venting the rear space 250, the feed force requirement is minimized when the new device 200 is restarted. If the percussion device 200 is switched off, any movement of the percussion piston 230 is stopped by the first part 233 of the front piston portion 232 being occupied by the abutment surface 216 at the diameter transition of the percussion housing 210.
    Figure 3a shows a flow chart of a method of a pneumatic percussion device 200, according to an embodiment of the present invention. The percussion device 200 comprises connecting means 256 arranged for connection to a compressed air line 202 of an external compressed air head, and a percussion device 205. The percussion device 205 comprises a percussion housing 210 and a percussion piston 230 arranged for reciprocating movement in said percussion housing 210, which percussion piston 230 has a front piston portion 232 and a rear piston portion 236, where the front piston portion 232 acts on an insert tool 224 provided with the percussion device 200, used in the percussion piston 230 and the percussion housing 210 together form a front space 240 and a rear space 250, where the front space 240 is defined of the front piston parity 232 and the rear space 250 are delimited forward by the rear piston portion 236, used in said compressed air line 202 is arranged in airflow connection with the rear space 250 via a first passage 252 in the percussion housing 210, and used in said compressed air line 202 is arranged in air flow connection with the front space 240 vi a second passage 242 in the percussion housing 210, at which second passage 242 a first valve means 246 is arranged.
    The method comprises a first method step s301. The step s301 comprises controlling the first valve member 246 by means of guide means 280, arranged alternately exposed to an air pressure of said rear space 2 and an intermediate space 260 formed between the percussion housing 210, the front piston portion 232 and the rear piston portion 236, at the front and rear piston portions 230, respectively. return movement, accustomed to the control means 280, controls said first valve means 246 on the basis of said air pressure. After the procedure step s301, the procedure is terminated.
    Figure 3b shows a flow chart of a method of a pneumatic percussion device 200, according to an embodiment of the present invention. The percussion device 200 comprises connecting means 256 arranged for connection to a compressed air line 202 of an external compressed air head, and a percussion device 205. The percussion unit 205 comprises a percussion housing 210 and a percussion piston 230 arranged for forward and reciprocating movement in said percussion housing 210, which percussion piston 230 has piston portion 232 and a rear piston portion 236, where the front piston portion 232 acts on an insert tool 224 provided with the percussion device 200, used in the percussion piston 230 and the percussion housing 210 together form a front space 240 and a rear space 250, where the front space 240 is defined backed by the front piston parity 232 and the rear space 250 are bounded forward by the rear piston portion 236, said compressed air line 202 is arranged in air flow connection with the rear space 250 via a first passage 252 in the percussion housing 210, and van in said compressed air line 202 is arranged in air flow connection with the front space 240 via a second p assage 242 28 in the percussion housing 210, at which second passage 242 a first valve member 246 is provided.
    The process includes a first process step s310. Step s310 involves starting the percussion device 200 by activating the supply of compressed air to the rear space 250 of the percussion housing 210. After the process step s310, a subsequent process step s320 is performed.
    Procedure step s320 involves effecting a displacement of the percussion piston 230 in the percussion housing 210 toward a forward position of the percussion piston 230, at which the percussion piston 230 vibrates in an insert tool 224 provided with the percussion device 200. Following the process step s320, a subsequent procedure step is performed.
    Method step s330 involves effecting a reciprocating movement of the percussion piston 230, by controlling the first valve means 246 so that it opens and compressed air is supplied to the front space 240. When the rear piston portion 236 has passed to the percussion housing 210 arranged guide means 280, so that the control means 280 are in connection with the rear space 2 and thus subjected to the pressure in the rear space 250, the first valve member 246 is guided to an open position. In this way a pressure build-up is effected in the front space 240, which pressure acts on the front piston portion 232 so that the percussion piston 230 is moved backwards in the percussion housing 210. After the procedure step s330 a subsequent procedure step s340 is performed.
    Method step s340 involves controlling the return movement of the percussion piston 230, by controlling the first valve member 246 so that it is shut off and the supply of compressed air to the front space 240 is stopped. When the rear piston portion 236 in its movement has passed the guide means 280, said that the guide means 280 are in communication with a gap 260 formed between the percussion housing 210, the front piston portion 232 and the rear piston portion 236, and thus subjected to the pressure in the gap 260, 29 controls the first valve member 246 to a rod bearing. When the first valve member 246 has been closed, the percussion piston 230 continues to move backwards in the percussion housing 210 by means of its own agitation energy, until the pressure of the rear space 250 completely brakes the rearward movement of the percussion piston 230. After the process step s3, a subsequent process step s350 is performed.
    Process step s350 involves venting the outer space 240 when the first valve member 246 is closed, to minimize the braking effect when the percussion piston 230 is again pushed free. After the step step s350, a subsequent step step s360 is performed.
    Process step s360 involves switching off the percussion device 200 by interrupting the supply of compressed air to the percussion housing 210 and venting the percussion housing 210. After procedure step s360, the process is terminated.
    The foregoing description of the preferred embodiments of the present invention has been provided for the purpose of illustrating and describing the invention. It is not intended to be exhaustive or to limit the invention to the variations described. Obviously, many modifications and variations will occur to those skilled in the art. The embodiments were selected and described in order to best explain the principles of the invention and its practical applications, thereby enabling those skilled in the art to understand the invention for different embodiments and with the various modifications which are appropriate to the intended use.
    权利要求:
    Claims (15)
    [1]
    A pneumatic percussion device (100, 200), comprising connecting means (156, 256) arranged for connection to a compressed air line (102, 202) of an external compressed air head, and a percussion device (105, 205), which percussion device (105, 205) comprises a percussion housing (210) and a percussion piston (230) arranged for forward and reciprocating movement in said percussion housing (210), which percussion piston (230) has a front piston portion (232) and a rear piston portion (236), where the front piston portion (232) affects an insert tool (124, 224) arranged at the percussion device (200), used in the percussion piston (230) and the percussion housing (210) together form a front space (240) and a rear space (250), where the front space (240) is delimited baked by the front piston portion (232) and the rear space (250) is bounded forward by the rear piston portion (236), said compressed air duct (102, 202) being arranged in air flow communication with the rear space (250) via a first passage (252). ) in the percussion house (210), and used to said compressed air line (102, 202) is arranged in air flow connection with the front space (240) via a second passage (242) in the percussion housing (210), at which second passage (242) a first valve means (246) is arranged, characterized in that the percussion piston (230) is designed so that a gap (260) is formed between the front piston portion (232) and the rear piston portion (236) and the percussion housing (210), used in guide means (280) are arranged to alternately be subjected to an air pressure of said rear space (250) and said intermediate space (260), respectively, in the reciprocating movement of the percussion piston (230), and said control means (280) are arranged to control said first valve means (246) on the basis of said air pressure, to alternately supply compressed air to the front space (240) and effect a reciprocating motion of the percussion piston (230).
    [2]
    A pneumatic percussion device according to claim 1, comprising a first vent passage (290) disposed having said percussion housing (210), for maintaining atmospheric pressure having said intermediate space (260). 31
    [3]
    Pneumatic percussion device according to claim 1 or 2, used in the guide means (280) comprising a guide passage (282) arranged at said percussion housing (210) and a guide line (284) arranged between the guide passage (282) and the first valve means (246).
    [4]
    A pneumatic percussion device according to any one of the preceding claims, comprising a second vent passage (292) arranged at the percussion housing (210) so as to communicate with the outer outlet (240) when the guide means (280) communicates with the intermediate space (260).
    [5]
    A pneumatic percussion device according to any one of the preceding claims, comprising a supply line (272) arranged in air flow connection with the compressed air line (202) and the first valve means (246).
    [6]
    A pneumatic percussion device according to any one of the preceding claims, the connecting means (156, 256) comprising a second valve means (257), arranged in connection with the compressed air line (202) for regulating the supply of pressurized air.
    [7]
    A pneumatic percussion device according to claim 6, comprising an actuating means (258) arranged in connection with the second valve means (257), for manually effecting opening / closing of the second valve means (257).
    [8]
    A pneumatic percussion device according to claim 7, used in the actuator (258) is a servo valve.
    [9]
    A pneumatic percussion device according to any one of the preceding claims, comprising a venting device (248) arranged for venting said front space (240). 32
    [10]
    A pneumatic percussion device according to any one of the preceding claims, comprising a nnellan block (228) arranged nnellan the insert tool (224) and the front portion (232) of the percussion piston (230).
    [11]
    A pneumatic percussion device according to any one of the preceding claims, comprising a rotation mechanism for rotation of the insert tool (224).
    [12]
    A method of a pneumatic percussion device (100, 200), comprising connecting means (156, 256) arranged for connection to a compressed air line (102, 202) of an external compressed air head, and a percussion device (105, 205), which percussion device (105, 205) comprises a percussion housing (210) and a percussion piston (230) arranged for forward and reciprocating movement in said percussion housing (210), which percussion piston (230) further has a front piston portion (232) and a rear piston portion (236), there the front piston portion (232) acts on an insert tool (124, 224) arranged at the percussion device (200), the vane of the percussion piston (230) and the percussion housing (210) together form a front space (240) and a rear space (250), where the front space (240) is bounded backwards by the front piston portion (232) and the rear space (250) is bounded forward by the rear piston portion (236), used in said compressed air line (102, 202) being arranged in air flow connection with the rear space ( 250) via a first passage (252) in sla the factory housing (210), and used in said compressed air line (102, 202) is arranged in air flow connection with the front space (240) via a second passage (242) in the percussion housing (210), at which second passage (242) a first valve means ( 246) is arranged, the method comprising the step of: - controlling the first valve means (246) by means of control means (280), arranged alternately exposed to an air pressure of said rear space (250) and an intermediate space (260) formed between the percussion housing (210) ), the front piston portion (232) and the rear piston portion (236), at the reciprocating movement of the percussion piston (230), used in the guide means (280), control the said first valve member (246) on the basis of said air pressure. 33
    [13]
    A method of a pneumatic percussion device (100, 200) according to claim 12, further comprising the step of: - controlling said first valve means (246), so that it opens and Ulf & compressed air to said front space (240) reaches the percussion piston (230) is positioned so that the guide means (280) is in communication with the rear space (250), in order to effect a movement of the percussion piston (230) baked in the percussion housing (210).
    [14]
    A method of a pneumatic percussion device (100, 200) according to claim 12 or 13, further comprising the step of: - controlling said first valve means (246), such that it is closed when the percussion piston (230) is positioned so that the control means (280) star in connection with the intermediate space (260).
    [15]
    A method of a pneumatic percussion device (100, 200) according to any one of claims 12-14, further comprising the step of: - venting said front space (240) when the first valve member (246) is closed. 100
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1351298A|SE537608C2|2013-11-01|2013-11-01|Pneumatic impact device and method of pneumatic impact device|SE1351298A| SE537608C2|2013-11-01|2013-11-01|Pneumatic impact device and method of pneumatic impact device|
    EP14857160.7A| EP3062967B1|2013-11-01|2014-10-24|A pneumatic hammer device and a method pertaining to a pneumatic hammer device|
    CA2928578A| CA2928578C|2013-11-01|2014-10-24|A pneumatic hammer device and a method pertaining to a pneumatic hammer device|
    AU2014343102A| AU2014343102B2|2013-11-01|2014-10-24|A pneumatic hammer device and a method pertaining to a pneumatic hammer device|
    CN201480060004.7A| CN105705301B|2013-11-01|2014-10-24|Beche device and the method relevant with beche device|
    US15/033,786| US10414034B2|2013-11-01|2014-10-24|Pneumatic hammer device and a method pertaining to a pneumatic hammer device|
    PCT/SE2014/051256| WO2015065270A1|2013-11-01|2014-10-24|A pneumatic hammer device and a method pertaining to a pneumatic hammer device|
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