• 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:
    [Document Name] Abstract [Abstract] [Problen1to be Solved] To provide an air hammer tool which largelyreduces transmission of vibration to a worker, has a simple andlight-weight structure, can be manufactured.at a low cost, and canbe easily maintained. [Solution] ZM1airhammertoollAlun;asinglecoilspringšâ(elasticbody)externallyfitted
    公开号:SE1251242A1
    申请号:SE1251242
    申请日:2012-11-01
    公开日:2013-05-11
    发明作者:Yukio Watanabe
    申请人:Apuren Co Ltd；
    IPC主号:
    专利说明:

    Description of the invention Problem to be solved by the invention Since the constructions in the above-mentioned patent documents 1 to 4 are designed so that when a nozzle tool such as a chisel, which has received kinetic energy by being hit by the hammer, vibrates strongly in the main body of the tool. due to a counteracting vibration. Therefore, to prevent the air hammer tool from bouncing away or to prevent the tip tool from moving from the object to be struck, such as an object to be crushed, or to be able to transfer the force from the vibration of the tip tool effectively to the object to be struck so the worker must continuously hold the main body of the tool against the strong vibration. Transmission of strong vibrations to the worker causes the problem that prolonged use gives a high probability of causing damage to the worker's body such as vibration-induced white fingers. Furthermore, the noise caused by the work due to the vibrations of the tip tool, the impact between the tip tool and the hammer, or the like can cause a hearing loss in the worker and the people working in the vicinity of the workplace.
    The construction in the above-mentioned patent document 5 can solve the above-mentioned problems. However, the buffer chamber must be large to be able to fill the main body of the tool with an amount of buffer liquid which is large enough to achieve a sufficient buffer effect, and therefore the air hammer as a whole becomes large and its weight increases. Therefore, the problem arises that it is very difficult for the worker to handle the tool. Furthermore, since buffer liquid must be filled into the main body of the air hammer without leakage, the problem arises that the internal construction becomes very precise and complex, and that the manufacturing cost increases significantly. In addition, since the number of components in the air hammer tool also increases, the problems arise that a thorough cleaning becomes quite laborious and that maintenance cannot be performed in a simple manner. Due to the above reasons, the construction shown in patent document 5 is not very practical and it is not available on the market at present.
    Therefore, it is an object of the present invention to provide an air hammer tool which appreciably reduces the vibrations and noise transmitted to the worker, has a simple construction with low weight, can be manufactured at a low cost and can be easily maintained, and a method of pre-adjusting an impact force of the air hammer tool.
    The present invention relates to an air hammer tool comprising a cover body and a tip tool which extends forward from the cover body; and an impact force obtained by a gas which is pressurized and inserted into said cover body, which is applied to an object to be struck by said tip tool, said cover body having an inner space portion which is formed in the longitudinal direction, a portion for introducing gas pressure which is formed in the peripheral wall of the cover body for a pressurized and introduced gas, forwardly into the inner space portion, the inner space portion therein having a longitudinally slidable sliding body and an elastic body disposed between the outer peripheral surface of the slider body and the outer body of the cover body. said slider having a main body and a cylindrical portion which has a cylindrical shape and is arranged at a front end portion of the main body of the slider for projecting forwardly from said cover body, a gas introducing portion for guiding the pressurized and introduced gas into in said cover body into the cylindrical portion and a portion for inserting g as is formed in the peripheral wall of the cylindrical portion, a hammer is loaded in the cylindrical portion to be slidable in the longitudinal direction, a rear end portion of said tip tool is fixed to a front opening portion of the cylindrical portion to be able to hit with said hammer, when the gas is pressurized and inserted into said cover body through said gas pressure introducing portion, said slider body is moved forward in the cover body by the gas pressure while elastically deforming the elastic body, and the hammer reciprocates longitudinally within the cylindrical portion of the gas. inserted into said cylindrical portion through said gas insertion portion, and said hammer repeatedly strikes the rear end portion of said nozzle tool and thereby provides said impact force. As described above, the air hammer tool according to the present invention has a first feature in which the cover body and the sliding body into which the hammer which is to hit the tip tool is inserted are provided as individual bodies, and the elastic body is arranged between the cover body and the sliding body. In the above construction, since the shock caused by the impact between the hammer in the sliding body and the tip tool, and the inertia of the hammer performing the reciprocating movement are well absorbed by the elastic body, strong vibrations are prevented from being transmitted to the worker holding the cover body.
    In addition, in addition to the above features, the air hammer tool has a second feature so that the cylindrical portion and the tip tool are fixed to make the tip tool immovable relative to the cylindrical portion. In the above-mentioned construction, when the impact force is applied to the object to be hit to perform the work, the tip tool is put in contact with the object to be hit and the air hammer tool is in operation. Then, when the hammer in the cylindrical portion strikes the tip tool, the tip tool acts as a so-called chisel, and the impact force obtained by the inertia of the hammer is applied to the object to be hit by the tip tool.
    Therefore, compared to a conventional construction where the impact force is applied to the object to be hit by the vibration of the tip tool itself, the air hammer tool does not vibrate strongly, and no noise is caused by the vibration of the tip tool itself. Therefore, in conjunction with the benefits of the above-mentioned first features, the vibrations transmitted to the worker and the noise are significantly reduced, and an air hammer tool can be provided with regard to the worker's health and so on.
    Furthermore, the above-mentioned air hammer tool according to the invention has a third feature wherein the tip tool is in a forwardly projecting position with the forward movement of the firing body from the pressure of the introduced gas during work, and when the gas introduction is stopped to pause the work, the firing body is returned to its original position by said elastic force. body and the tip tool end up in a retracted position. That is, in order to pause the work, it is normally necessary for the worker to stop the introduction of gas and move the air hammer tool from the object to be hit in order to move the tip tool from the object to be hit.
    However, according to the present invention, the tip tool is returned backwards by itself to be moved from the object to be hit without intentionally moving the air hammer tool itself from the object to be hit. Therefore, for example, when the Air Hammer tool of the present invention is used to machine a plurality of workpieces (objects to be struck) one after the other, it is possible to replace the workpieces one after the other at each time the tip tool moves from the workpiece without moving the air hammer itself. the tool from the workpiece each time the work is paused.
    In the above construction it is proposed that the elastic body is a coil spring, the coil spring being arranged, in a longitudinal direction, between the front end surface of said sliding body and the inner peripheral surface of said cover body, wherein when the gas is pressurized and introduced into said cover body by said portion gas pressure to move said slider forward, the coil spring is elastically compressed to push the slider backwards. When the slider is moved forward, the coil spring which is elastically connected to push the slider backwards has both the function of absorbing the shock caused by the hammer in the slider and the tip. the inertia of the hammer which performs the movement back and forth and a function for returning the slider to the original position when the introduction of pressurized gas is stopped to pause the work. Furthermore, the air hammer tool in the above construction has an extremely simple inner construction because it uses an elastic body formed of a solid material which does not use a buffer liquid and does not require the addition of a particularly large mechanism other than the coil spring. Therefore, the increase in weight as a whole is reduced, and the whole tool becomes compact. This prevents deterioration of the handling properties and enables maintenance in an excellent way.
    Here, in the above-mentioned construction with only the coil spring arranged between the front end surface of the sliding body and the inner peripheral surface of the cover body, the vibrations transmitted to the worker are substantially reduced by the above-described function of the coil spring for shock absorption and the like.
    However, since the sliding body is maintained in a state when it is always pressed backwards by the reaction force from the coil spring when it is used, there is a possibility that the pressing force from the tip tool on the object to be hit decreases, so the whole impact force becomes weak, or if the supply of the introduced pressurized gas to push the firing body forward becomes unstable, then the firing body jumps into the cover body and a stable impact force cannot be achieved.
    Therefore, the following design is proposed for further improvement.
    That is, the coil spring as an elastic body is arranged, in a longitudinally directed and elastically compressed condition, between the rear end surface of said slider and the inner peripheral surface of the cover body, and the coil spring is designed to push the slider forward when the gas is pressurized into the cover body. of gas pressure to advance the slider.
    In the above construction, the coil spring, which is elastically compressed to push the slider forward as the slider moves forward, holds the slider in a suitable manner to suitably push the tip tool against the object to be hit and to enable the slider to be prevented. jumps. Thus, a stable impact force can be achieved.
    In addition, the present invention relates to a method of adjusting an impact force of the above-described air hammer tool, in which the coil spring disposed between the front end face of the slider and the inner peripheral surface of the cover body is disposed as a first coil spring, the coil spring disposed between the rear end the inner peripheral surface of said cover body is arranged as a second coil spring, and wherein a pressing force of the second coil spring relative to the sliding body is changed to adjust the impact force.
    For example, as the compressive force of the second coil spring against the push body increases, the impact force increases, and as the compressive force decreases, the impact force decreases. When the above construction is used, it becomes possible to easily fine-tune the impact force of the air hammer tool while preventing strong vibrations from being transmitted to the worker.
    Furthermore, the following construction can also be used. That is, it is a structure in which an air control body, to which a gas is supplied from the outside, is arranged in the rear of the cover body, the gas supplied from the outside is directed to the portion for introducing gas pressure which is arranged in the cover body, by operating the switch of the air control switch portion arranged on the air control body, and a cylindrical grip body is arranged externally on the outer periphery of the cover body and / or the outer periphery of the air control body in the longitudinal direction via an elastic member.
    The grip body is attached to the cover body or the air control body via the elastic member. Therefore, when the worker holds the gripping body to perform the work, vibrations in the longitudinal direction and the like caused by the cylindrical portion of the elastic member are absorbed, and the vibrations transmitted to the worker are therefore significantly reduced. For example, the worker grips the grip body attached to the cover body with one hand and the grip body attached to the air control body with the other hand to perform the work, thereby significantly reducing the load caused by vibrations.
    Effect of the Invention The air hammer tool of the present invention has the effect of significantly reducing vibrations and noise transmitted to the worker, and it can be manufactured at a low cost and easily maintained because it has a simple construction with low weight. Furthermore, the method of adjusting the impact force of the air hammer tool according to the present invention has the effect that the impact force can be fine-tuned in a simple manner.
    Brief Description of the Drawings Figure 1 is a vertical cross-section of an air hammer tool.
    Figure 2 is a vertical cross-section showing another condition of the air hammer tool.
    Figure 3 is a cross-section A-A according to Figure 1.
    Figure 4 is a partial view of a vertical cross section showing the inside of the cylindrical portion as an enlargement.
    Figure 5 is a table and graphs of vibration absorption performance showing a comparison between the air hammer tool of the present invention and a conventional product, where Figure 5A shows averages, Figure 5B shows a change in performance over time of the product of the present invention and Figure 5C shows a performance change over time for a conventional product.
    Figure 6 is a schematic diagram showing a measurement method.
    Figure 7 is a vertical cross-section of an air hammer tool according to another embodiment.
    Figure 8 is a vertical cross-section of an air hammer tool according to the second embodiment.
    Procedures for Carrying Out the Invention Embodiments of the air hammer of the present invention will be described below with reference to the accompanying drawings.
    For the sake of simplicity, the description considers that the tip direction of the air hammer is forward and that a direction towards the base end is backwards. However, this should not be construed as excluding the air hammer tool from use in an upward or downward direction. Furthermore, the air hammer tool of the present invention is not limited to the following embodiments, but all suitable design changes may be made without departing from the scope of the present invention.
    As shown in Figure 1, the air hammer tool 1A is a tool that uses compressed air and includes a cover body 2 into which the compressed air is introduced from the outside, and a tip tool 20 which extends forward from the cover body 2.
    The cover body 2 is made of a metal material and has a grip portion 3a which is gripped by a worker at work and a main body portion 3b which has a substantially cylindrical shape which is formed continuously from the top of the grip portion 3a to extend in the longitudinal direction.
    A release portion 4a is provided at the front surface portion 3a of the grip portion.
    Operation of the trigger portion 4a enables control of the supply of compressed air to the air hammer tool 1A. Furthermore, an opening for air supply 4b for introducing compressed air from the outside is formed at the lower end 3a of the grip portion.
    A well-known device is suitably used as a device for introducing compressed air, which introduces compressed air into the cover body 2 from the outside and enables a flexibly controlled inflow of compressed air through the release portion 4a. The main body portion 3b has an inner space portion 2a formed in the longitudinal direction. Furthermore, a portion for introducing gas pressure 6a for introducing the compressed air into the inner space portion 2a is formed in a peripheral wall at the rear end of the main body portion 3b. Furthermore, a valve 5 is arranged internally next to the portion for introducing gas pressure 6a. The compressed air introduced from the gripping portion 3a flows into the inner space portion 2a of the main body portion 3b through the valve 5.
    Furthermore, a gas discharge portion 6b is formed in a peripheral wall at the front end of the main body portion 3b, which enables the compressed air to be introduced into the main body portion 3b to be discharged therethrough.
    Furthermore, a sliding body 8 is arranged to be slidable in the longitudinal direction in the inner space portion 2a of the main body portion 3b. The slider 8 is made of a metal material and has a main body portion 10 having a large diameter cylindrical shape, and a cylindrical portion 11 having a cylindrical shape extending forward from the center of a front end surface 10a of the slider main body portion 10 as shown in Figure 1. In addition, the cylindrical portion 11 projects from the cover body 2 through an opening 6c for extending the cylindrical portion which opens at the front end of the main body portion 3b. A bearing member 17 is on the inside in contact with the inner edge of the opening 6c for extension of the cylindrical portion, and the cylindrical portion 11 is slidably supported by the bearing member 17.
    Furthermore, the outer peripheral surface 10 of the sliding body portion 10 is provided with a plurality of o-rings 12. Furthermore, the o-rings 12 are tightly attached to the inner peripheral surface of the main body portion 3b. Furthermore, in the inner space portion 2a of the main body portion 3b, a very airtight inflow chamber 7 for compressed air is formed between the rear end surface of the sliding body 8 and the inner peripheral surface of the main body portion 3b which is opposite the rear end surface.
    Furthermore, as shown in Figures 3 and 4, a plurality of gas passages are formed through the main body portion 10 of the slider. Further, among the plurality of gas passages, a gas discharge feed portion 13 is formed with the gas passage which is connected between the compressed air inlet chamber 7 and the main body portion 3b. a portion for introducing gas 14a consists of a gas duct which is connected between inflow chamber 7 for compressed air and the inside of the cylindrical portion 11. In addition, as shown in figure 4, the cylindrical portion 11 of the firing body 8 has an outer cylindrical portion 11a. Furthermore, a supply-blow-out changeover valve 14c is arranged at the base end portion of the outer cylindrical portion 11a. On the other hand, a fitting portion 18, which is formed by an inner thickening of a peripheral wall around a front opening portion 8a, is formed at the front end portion 8a of the outer cylindrical portion 11a, and the tip tool 20 is attached to the fitting portion 18 in such a manner that cannot be moved relative to the cylindrical portion 11.
    As shown in Figure 4, the tip tool 20 is made of a metal material, has a main body 22 and also has a pile-shaped chisel portion 20a which is attached to a tip end of the tip body 22 of the tip tool, a disc-shaped attachment 20b formed at the intermediate portion of the main body 22, and a rear end portion 20c which projects rearwardly from the center of the mounting portion 20b.
    Further, the rear end portion 20c of the tip tool 20 is inserted into the fitting portion 18 through the front opening portion 8a of the outer cylindrical portion 11a and extends into the cylindrical portion 11, and a surface of the mounting portion 20b is in contact with the end surface of the outer cylindrical portion 11a. Furthermore, this contact portion is covered by a lock-shaped clamping body 15 which has an insertion hole 15a for the tip tool formed at its center, through which hole the tip tool 20 is inserted. With the clamping body 15 mounted, the mounting portion 20b is held between the inner surface of the clamping body 15 and the tip end surface of the cylindrical portion 11a, and the clamping body 15 and the tip end surface of the cylindrical portion 11a are screwed into each other by an o-ring 15b attached to the outer peripheral portion 18. Thereby the tip tool 20 is fixed so that it does not fall off from the cylindrical portion 11. Incidentally, the clamping body 15 is removable from the cylindrical portion 11, therefore the tip tool 20 is replaceable.
    Next, the construction of the above-mentioned tip tool will be described in more detail.
    As shown in Figure 4, a shank portion 20e is continuously formed at the base end portion of the chisel portion 20a, and o-rings 20f are attached to the shank portion 20e. Furthermore, the shaft portion 20e is attached to and fixed to the front end of the main body 22 of the tip tool. The shaft portion 20e is removable from the main body 22 of the tip tool and the chisel portion 20a can therefore be replaced if necessary. Further, as shown in Figure 4, a portion at the front of the mounting portion 20b of the tip body 22 of the tip tool is formed to have a cylindrical shape. Furthermore, a buffer material 21 is made of a fibrous material such as felt (a needle felt which is not woven) consisting of polyester fiber filled in the main body 22 of the tip tool to reduce noise through the fibrous material. In addition, a plurality of heat radiation holes 20d for preventing the buffer material 21 from being subjected to an excessive temperature increase due to obtained heat energy are formed in the peripheral wall of the tip body 22 of the tip tool at the portion where the buffer material is 21 is filled.
    Next, the cylindrical portion 11 will be described in detail. A hammer 30 made of a metal material is slidably attached to the outer cylindrical portion 11a of the cylindrical portion 11. The hammer 30 has a suitably adapted optimal size and weight.
    In addition, as shown in Figure 1 and others, a single coil spring 9 (elastic body) is attached externally to the outer periphery of the cylindrical portion 11. In a further detail, the cover body 2 has an annular spring stop portion 16 which is arranged at the front end portion of the main body portion 3b, and the coil spring 9 is arranged, in a longitudinal direction, between the rear end surface 16a of the annular spring stop portion 16 and the front end portion 10 of the slider body 10. and acts as a compression tether.
    When the above air hammer tool 1A is used, the tip end of the tip tool 20 is pushed against an object to be hit (not shown) such as a stone or a concrete block, and the trigger portion 4a is operated. Then the compressed air is continuously introduced into the inflow chamber 7 for compressed air through the portion for introducing gas pressure 6a of the main body portion 3b while the valve 5 prevents opposite flow to the air supply portion 4b. Furthermore, the sliding body 8 reaches a state when it is pushed forward by the increase in pressure in the inflow chamber 7 for compressed air. When the sliding body 8 is pushed forward, as shown in Figure 2, the volume of the inflow chamber 7 for compressed air increases, and the coil spring 9 is elastically compressed between the spring stop portion 16 and the main body portion 10 of the sliding body, the sliding body 8 being pressed backwards.
    Further, the compressed air introduced into the main body portion 3b is discharged from the gas discharge portion 6b to the outside of the cover body 2 through a further supply portion 13 for gas discharge formed in the main body portion 10 of the sliding body. in the main body portion 3b into the cylindrical portion 11 through the portion for introducing gas 14a of the main body portion 10 of the slider, its flow direction being suitably controlled by the supply blow-out gear valve 14c to cause the hammer 30 to reciprocate longitudinally. direction. Furthermore, the hammer 30 moving back and forth will repeatedly strike the rear end portion 20c of the tip tool 20. Therefore, an impact force will be continuously applied to the object to be struck by the tip tool 20. A well-known mechanism is suitably used as the mechanism in which the hammer 30 moves back and forth in the cylindrical portion 11. For example, the well-known mechanism shown in JP -A-Hei 9-11156 is suitably used for the present air hammer tool 1A.
    In the above construction, the cover body 2 held by the worker's hand and the slider body 8 in which the hammer 30 intended to hit the tip tool 20 is inserted are provided as separate components, and the coil spring 9 is arranged between the cover body 2 and the slider body 8; therefore, the shock caused when the hammer 30 and the tip tool 20 strike each other and the inertia of the hammer 30 moving back and forth will be properly absorbed by the coil spring 9. Therefore, transmission of vibrations to the worker using the air hammer tool 1A is effectively prevented.
    Furthermore, the tip tool 20 is integrated with the firing body 8, and the impact force caused when the hammer 30 hits is transmitted only to the object to be hit. Therefore, strong vibrations are not transmitted to the grip portion 3a of the cover body 2. Therefore, the air hammer tool 1A causes much less vibration compared to how an air hammer tool where the tip tool has a conventional construction vibrates. As a result of using the air hammer tool with a conventional construction, serious problems such as vibration-induced white fingers or hearing loss, to which workers are exposed, can be prevented.
    In addition, the above air hammer tool 1A has a simple construction on the inside, a small number of parts, a compact overall construction and a low weight. Therefore, its manufacturing cost is reduced. Furthermore, since it is easy to disassemble, it also has the advantage that the maintenance work is facilitated.
    Furthermore, the air hammer tool 1A has the tip tool 20 which is moved to a forwardly projecting position during work (see Figure 1), but when the trigger 4a is operated to pause the operation, it is released from the pressure from the compressed air, the firing body 8 is returned to the original position by the coil spring. 9 and the tip tool 20 moves to a retracted position (see Figure 2).
    I.e. that when the work is paused to stop the introduction of compressed air into the hammer tool 1A, the tip tool 20 itself will be moved backwards to be moved from the object to be hit. Therefore, for example, it is not necessary to move the air hammer tool 1A itself from the work each time the work is paused as a plurality of workpieces (objects to be struck) are machined one after the other. This enables the workpieces to be replaced one after the other in response to, for example, the tip tool 20 being moved backwards.
    For reference, the noise measured for a prototype corresponding to the construction described above corresponds to about 90 dB, and the noise measured for a conventional general purpose product not provided with the coil spring 9 described above was about 95 dB (Sound level meter used: model SL-310 manufactured by Multi Measuring Instruments Sales Co., Ltd.).
    Furthermore, the air hammer tool of the present invention and the conventional product (not provided with coil spring 9) are compared with respect to the performance of vibration absorption with reference to Figs. 5. For measuring vibration, as shown in Fig. 6, vibrations are measured in three axes (longitudinal, vertical and lateral). at the rear end portion of the tool main body with a commercially available three-axis vibration meter.
    The pressure in the compressed air used for measurement was 0.25 MPa. Measurement time was 10 seconds (T). The tip tool 20 had a brush type. A vibration meter manufactured by Rion Co., Ltd. (model: UVO) was used. Measuring equipment manufactured by Yokogawa Meters & Instruments Corporation (model: DL750) was used. A piezoelectric acceleration microphone manufactured by Rion Co., Ltd. (model: PV-97C) was used. A vibration calibrator manufactured by Rion Co., Ltd. (model: VE-10) was used. As shown in Figure 5A, it was found from the measured results that the product of the present invention has excellent performance in vibration absorption in three axes compared to the conventional product. In particular, about 92% attenuation of the longitudinal vibration was achieved. Furthermore, the measured values obtained by the above-mentioned three-axis vibration meters were stable values with small scattering within the measuring time as shown in Figures 5B and 5C. As described above, it is also apparent from objective measurements that the air hammer tool of the present invention has an improved vibration damping performance.
    An air hammer tool 1B according to a second embodiment will be described below, however, the description of parts which are common to those in the first embodiment will be simplified or omitted, and the same reference numerals and symbols will be used in the figure.
    As shown in Figure 7, the air hammer tool 1B is provided with a first coil spring 91 and a second coil spring 92. The first coil spring 91 is arranged in a longitudinal direction between the front end surface 10a of the main body portion 10 of the slider 8 and an inner peripheral end surface 25a at the front of the cover body 2. On the other hand, the second coil spring 92 is arranged in a longitudinally directed state between the rear end surface 10b of the main body portion 10 of the slider 8 and an end surface 16b formed on the inner peripheral surface of the main body portion 3b arranged in the rear of the rear end surface 10b. Furthermore, in the above-fitted state, the second coil spring 92 is in an elastically compressed state and pushes the sliding body 8 forward.
    In addition, a support body 40 which is made of a well-known bearing member is arranged inside the cover body 2, and the support body 40 is in contact with the side surface portion of the slider body 8 to support the slider body 8 in a longitudinally movable manner, thereby preventing a gap for the slider body 8 in the above construction. , using the air hammer tool 1B, the trigger 4a is operated to continuously introduce the compressed air into the inflow chamber for compressed air 7. Then the slider 8 reaches a forward-pressed state while being supported by the support body 40 by the increased pressure inside the inflow chamber for compressed air 7. When the slider 8 is in the forwardly compressed state, the first coil spring 91 reaches the elastically compressed state and pushes the sliding body 8 backwards, and the second coil spring 92 in the elastically compressed state pushes the sliding body 8 forward.
    Furthermore, in the above state, the hammer 30 in the cylindrical portion 11 performs a reciprocating motion to strike the tip tool 20 repeatedly, and the impact force is continuously applied to the object to be struck by the tip tool 20. In the above construction, a vibration absorption effect and a noise reduction effect are achieved. through the first coil spring 91 on the front side. Furthermore, the pressure from the compressed air is supplemented by the second coil spring 92 on the rear side to push the sliding body 8 suitably forward, and the effect of stabilizing the impact force can thereby be achieved.
    As a reference, the impact force measured for a prototype corresponding to the above-mentioned second embodiment is improved by about 20-30% compared to the impact force of the prototype corresponding to the first embodiment not provided with the second helix 92. The impact force was measured by a measuring instrument which digitizes the kinetic energy transmitted from the tip tool 20 based on the acceleration.
    Here, since the second coil spring 92 is set to have a suitable spring constant, the impact force applied to the object to be struck can be adjusted while maintaining an optimal vibration absorption effect and noise reduction effect.
    For example, when it is desired to increase the impact force, the spring constant of the second coil spring 92 changes to increase the pressing force applied forward to the slider 8. Thus, when the slider 8 is suitably pressed forward, the tip tool 20 is accordingly suitably pressed against the object. to be hit, the slider 8 in the inner space portion 21 is prevented from jumping and the impact force is increased. On the other hand, when it is desired to reduce the impact force, the spring constant of the second coil spring 92 is changed to reduce the compressive force applied forward to the slider 8. Then the impact force decreases because the principle described above works in reverse. In addition to the above construction, an air hammer tool 1C according to another embodiment is proposed. Here, descriptions of parts common to those in the first and second embodiments are simplified or omitted, and the same reference numerals and symbols are used in the figure.
    As shown in Figure 8, an air control body 50 is provided in the rear of the cover body 2. The air control body 50 is provided with a main body 51 for the air control body. A gas passage 55 is formed longitudinally through the interior of the main body 51 of the air control body.
    Further, an air control switch portion 52 is provided on the outer surface of the main body 5 of the air control body. The air control switch portion 52 is provided with an operating portion 52A and an operating portion 52B. The operating portion 52A is made of a long and narrow plate member and its base end portion is rotatably supported by the side wall of the main body 5 of the air control body 51. Further, the operating portion 52B is made of a rod material projecting from the interior of the main body 51 of the air control body and its rear end the surface of the operating portion 52A. Further, when the operating portion 52A is in operation, the operating portion 52B is moved vertically along its axial direction. In addition, an on / off valve 54, which is built into the main body 51 of the air control body, is connected to the operating portion 52B. Furthermore, when the operating portion 52A is in operation, the on / off valve 54 is in operation adjacent to the operating portion 52B, and the gas duct 55 is opened or closed as appropriate. Well known techniques can be suitably used for the mechanism for the on / off valve 54. For example, the well known mechanism shown in JP-Y-3153805 can be used for the air hammer tool 1C.
    Furthermore, the portion for introducing gas pressure 6a of the cover body 2 and the gas duct 55 into the air control body 50 is airtight designed to communicate with each other between the air control body 50 and the cover body 2.
    Furthermore, a front grip body 74 with a cylindrical shape is attached externally to the outer periphery of the above-mentioned cover body 2 via o-rings 75 and 75 as elastic members. In this state, the o-rings 75 and 75 are tightly attached to the cover body 2 and the front grip body 74 in a state between them. In addition, the coil springs 78a and 78b are provided as elastic means in the front and in the rear of the front grip body 74. More specifically, a spring stop portion 76a with a flange shape is arranged around the front end portion of the cover body 2 and the coil spring 78a is arranged to cover the cover body 2 between the spring stop portion 76a and the front end surface of the front grip body 74. On the other hand, a spring stop portion 76b with a flange shape is arranged around the rear end portion of the cover body 2, and the coil spring 78b is arranged between spring spring and the rear end surface of the front grip body 74 to cover the cover body 2. The O-rings 75 have a vibration absorbing function to prevent vertical and lateral vibrations caused in the cover body 2 from being transmitted to the front grip body 74.
    Furthermore, the coil springs 78a and 78b have a vibration-absorbing function to prevent longitudinal vibration caused in the cover body 2 from being transmitted to the front grip body 74.
    In addition, a rear grip body 84 is attached to the rear portion of the above-mentioned air control portion 50. The rear grip body 84 is formed with a densely bottomed cylindrical member. Furthermore, the rear grip body 84 is attached externally to the air control body 50 with the o-rings 85 and 85 as elastic members arranged therebetween. Furthermore, the coil springs 94 and 94 are arranged as elastic means between the rear end surface of the air control body 50 and the bottom portion, in other words, the rear end portion of the rear grip body 84. The O-rings 85 have a vibration-absorbing function to prevent vertical and lateral vibrations transmitted to the air control body 50 are transmitted to the rear grip body 84. Furthermore, the coil springs 94 have a vibration absorbing function to prevent the longitudinal vibration transmitted to the air control body 50 from being transmitted to the rear grip body 84.
    An enlarged portion 58 of a large diameter is provided at the rear end portion of the main body portion 5 of the air control portion. In addition, an annular stop portion 86 is fixed to the front end of the rear grip body 84 with bolts 88 in the above construction, although the rear grip body 84 is suitable for falling backwards from the main body 51 of the air control body, the engagement of the stop portion 86 and the enlarged portion 58 prevents the grip body from falling. In addition, a compressed air introducing portion 96 is provided at the rear surface of the rear gripping body 84. The compressed air introduced from the outside through the compressed air introducing portion 96 passes through an air duct 89 in the rear gripping body 84 and is then controlled. to the gas duct 55 in the air regulator body 50. In the above construction, when the switch portion for air control 52 of the air regulator body 50 is in operation, the compressed air is first supplied to the gas duct 55 of the air regulator body 50 through the gas pressure introduction portion 6a of the cover body 2. the hammer 30 reciprocates in the longitudinal direction.
    Here, the front grip body 74 is arranged around the cover body 2, the rear grip body 84 is arranged near the switch portion for air control 52 and the worker can thereby grip the front grip body 74 with one hand and the rear grip body 84 with the other hand to perform the work.
    Having the above construction prevents the vibrations from being transmitted to the hand operating the air control switch portion 52 and the hand supporting the entire air hammer tool 1C, therefore the extremely high vibration absorption performance is achieved.
    In addition, according to the present invention, the cover body 2 and the tip tool 20 can be made of other materials. For example, in the first embodiment, the gripping portion 3a can be made of an elastic material such as rubber which can be gripped easily. Furthermore, the material of the hammer 30 can be suitably selected from well-known materials and can be formed with a core material and an outer shell covering the core material. Furthermore, the hammer 30 may suitably have a surface treatment. Furthermore, the hammer 30 can be formed by connecting a plurality of block bodies and the impact force and the weight composition of the hammer 30 can be adjusted on the basis of the number of block bodies. Furthermore, the elastic body made of a fibrous material can be filled in a desired position. Felt (a non-woven needle felt) consisting of polyester fiber can be used as the fibrous material. Furthermore, the fibrous material can be impregnated with oil to improve the durability of the fibrous material. Furthermore, the tip tool 20 may be, for example: a chisel for a rock drill, a concrete breaker or a chiseling machine; a nail, a rivet or a pile for a nail gun, a rivet machine or a pile machine; a ground leveling plate for a ground leveler, a packer, a cheerleader, a concrete slab, a road roller or a ground leveler; or a needle bundle for a jet chisel. Furthermore, the gas which is pressurized and introduced into the air hammer tool 1A to 1C is not limited to compressed air but may be a gas such as noble gas. 10
    权利要求:
    Claims (5)
    [1] 1. [Claim l] An air hammer tool, comprising: a cover body and a tip tool which is extended forward from thecover body; and an impact force obtained by a gas, which is pressured andinjected into said cover body, being applied to an object to beimpacted through said tip tool, wherein said cover body has an inner space portion which isformed along the longitudinal direction, a gas pressure-injectionportion which is formed in the peripheral wall of the cover bodyto a gas pressured and injected, forward into the inner spaceportion, the inner space portion has therein a longitudinallyslidable sliding body and an elastic body which is interposedbetween the outer peripheral surface of the sliding body and theinner peripheral surface of the cover body, said sliding body has a sliding body main body and a cylinderportion which has a cylindrical shape and is disposed at a frontend portion of the sliding body main body to protrude forward fromsaid cover body, a gas introduction portion for guiding the gas pressured andinjected, into said cover body into the cylinder portion and a gasintroduction portion is formed.ine1peripheral wall of the cylinderportion, a hammer is longitudinally slidably loaded.in the cylinderportion, a rear end portion of said.tip tool is fixed to a front-endopening portion of the cylinder portion to be impactable with saidhammer, when the gas is pressured and injected into said cover bodythrough said gas pressure-injection portion, said sliding body ismoved forward in the cover body by the pressure of the gas whileelastically deforming the elastic body, and the hammer is longitudinally reciprocated.within the cylinder portion by the gas 27 introducedi1nx>sardcylinderportionthroughsxnrígasintroductionportion ,and said hammer repeatedly impact against the rear endportion of said tip tool, thereby providing said impact force.
    [2] 2. [Claim 2] The air hammer tool according to Claim l, wherein said elastic body is a coil spring, the coil spring is interposed in a longitudinally orientedstate between a front end face of said sliding body and an innerperipheral surface of said cover body, when the gas is pressured and injected into said cover bodythrough said gas pressure-injection portion to move forward saidsliding body, the coil spring is elastically contracted to urgethe sliding body rearward.
    [3] 3. [Claim 3] The air hammer tool according to Claim 2, wherein a coil spring as the elastic body is also interposedin a longitudinally oriented and elastically contracted statebetween the rear end face of said sliding body and the innerperipheral surface of said cover body, and the coil spring urges the sliding body forward with saidsliding body in a forward moved state by the gas pressured andinjected, into said cover body through said gas pressure-injectionportion.
    [4] 4. [Claim 4] The air hammer tool according to any one of Claimsl to 3, wherein an air control body to which a gas is supplied froman outside is a cylindrical grip body is externally fitted to the outerperiphery of said cover body and/or the outer periphery of said air control body along the longitudinal direction via an elastic 28 member.
    [5] 5. [Claim 5] A method of adjusting an impact force of the airhammer tool according to Claim 3, wherein the coil spring interposed between the front end faceof said sliding body and the inner peripheral surface of said coverbody is provided as a first coil spring, the coil spring interposed between the rear end face of saidsliding body and the inner peripheral surface of said cover bodyis provided as a second coil spring, and an urging force of the second coil spring against said sliding body is changed to adjust said impact force. 29
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE3690814C2|1986-12-15|1990-12-20|Inst Gornogo Dela Sibirskogo O|Pneumatic device for single strokes|
    WO1993009919A1|1991-11-11|1993-05-27|Nauchno-Tekhnichesky Kooperativ 'tekhprogress'|Pneumatic instrument|
    WO1993020981A1|1992-04-10|1993-10-28|Nauchno-Tekhnichesky Kooperativ 'tekhprogress'|Pneumatic instrument|
    US5626199A|1995-07-05|1997-05-06|T.C. Service Company|Pneumatic impact tool having improved vibration and noise attenuation|
    SE510057C2|1997-08-07|1999-04-12|Wiklund Henry & Co|Outlet channel in pressure medium driven stroke mechanism|
    US6192997B1|2000-04-12|2001-02-27|Ten-Weng Tsai|Pneumatic hammer with buffers|
    US6691798B1|2002-06-19|2004-02-17|Steven James Lindsay|Variable hand pressure activated power tool|
    US6805272B1|2003-08-06|2004-10-19|Yang Sen-Mu|Pneumatic nail driver|
    TWM293826U|2006-01-10|2006-07-11|Shuen Tai Prec Entpr Co Ltd|Portable power hammer chisel having shock absorbing guiding sleeve|
    TWI350789B|2008-07-16|2011-10-21|
    TWI358351B|2008-12-01|2012-02-21|
    US8240394B2|2008-12-09|2012-08-14|Sp Air Kabushiki Kaisha|Hammer with vibration reduction mechanism|
    TWI358352B|2009-09-18|2012-02-21|
    TWI413579B|2009-09-22|2013-11-01|Basso Ind Corp|Power tool|KR102020252B1|2017-05-23|2019-09-10|두산중공업 주식회사|Automated slot-wedge assembly device|
    TWI637825B|2018-05-11|2018-10-11|欣特實業股份有限公司|Shock absorption structure of pneumatic tools|
    KR102027231B1|2018-06-27|2019-10-02|대모 엔지니어링 주식회사|Volume variable apparatus for gas chamber of hydraulic breaker|
    KR101971922B1|2018-09-19|2019-04-24|탐코리아 주식회사|Apparatus for grinding goods with mirror face by electric motor|
    KR102042439B1|2018-11-01|2019-11-08|재단법인대구경북과학기술원|Device for repairing drainpipe|
    CN111485096A|2020-06-02|2020-08-04|香河华美齿轮有限公司|By means for reducing stress in gear blanks|
    TWI746323B|2020-12-21|2021-11-11|馬頓企業股份有限公司|Pneumatic percussion device and its actuation method|
    KR102319659B1|2021-08-06|2021-11-01|탐코리아 주식회사|Apparatus for grinding goods with mirror face by pneumatic drive|
    法律状态:
    2015-03-31| NAV| Patent application has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011246970A|JP5082051B2|2011-02-05|2011-11-10|AIR HAMMER TOOL, AND METHOD OF ADJUSTING BATTLE FORCE OF THE AIR HAMMER TOOL|
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