• 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:
    IMPACT TOOL A technique for producing a vibration-proof handle while preventing an increase in size is provided in an impact tool. The impact tool has a hammer mechanism part (113,115) for driving a tool bit (119) in its axial direction, a motor (111) for driving the hammer mechanism part (113,115), a tool body ( 103) that houses the motor (111) and the impact mechanism part (113,115), an external casing housing (102) that covers part of the tool body (103), a handle (109) that is integrally formed to the housing outer casing (102) and extends transversely in the axial direction of the tool drill (119), a first handle end portion (109B) formed at an extended end of the handle (109), a second handle end portion ( 109C) formed on the other extended end of the handle (109), a first elastic element (131) that connects the first portion of the handle end (109B) and the tool body (103) for relative movement in the axial direction of the tool bit (119), and a second the elastic element (165) connecting the second handle end portion (109C) and the tool body (103) for relative movement in the axial direction of the tool bit (119).
    公开号:BR112012008577B1
    申请号:R112012008577-8
    申请日:2010-10-22
    公开日:2020-10-27
    发明作者:Masanori Furusawa；Yoshihiro Kasuya；Hajime Takeuchi
    申请人:Makita Corporation；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    The present invention relates to an impact hammer tool that performs a predetermined hammering operation causing a tool bit to move linearly in an axial direction of the tool bit. BACKGROUND OF THE INVENTION
    Patent Publication open to public inspection No. JP 2003-165073 features a vibration-proof housing structure for an impact tool in the form of an electric hammer. In this electric hammer, an external housing that forms an external envelope of the electric hammer and is fully equipped with a handle to be held by a user is connected by means of an elastic member to a tool body (an internal housing) that houses a part percussion mechanism to strike a hammer drill. With such a construction, the vibration caused during the hammering operation can be reduced.
    According to the construction described above, the transmission of vibration caused in the impact mechanism part to the handle can be reduced, however, with the construction in which the external housing entirely covers the internal housing, including the motor housing, the hammer electric is increased in size. At that point, further refinement is required. DESCRIPTION OF THE INVENTION OBJECT OF THE INVENTION
    Consequently, it is an object of the present invention to provide an impact tool that is perfected to reduce the size of the entire impact tool, while maintaining the vibration-proof effect of the handle. MEANS TO ACHIEVE THE OBJECT
    In order to achieve the object described above, according to a preferred embodiment of the present invention, an impact tool has a percussion mechanism part, a motor, a tool body, an external casing housing, a handle, first and foremost second handle end portions and first and second elastic elements. In addition, the “impact tool” in this invention suitably includes a hammer in which a tool bit is moved linearly in its axial direction, and a hammer bit in which the tool bit is moved linearly in its axial direction and rotates around its geometric axis.
    According to the preferred embodiment of this invention, the impact mechanism part strikes a tool bit in an axial direction of the tool bit. The motor drives the impact mechanism part and is arranged in such a way that a geometric axis of rotation of the motor crosses the axial direction of the tool bit. The tool body houses the motor and the impact mechanism part and has a front end region to which the tool bit is attached. The outer wrap housing covers part of the tool body. The "tool body part" here typically represents a region that houses the striking mechanism part of the tool body. The handle is integrally formed with the outer casing housing on the side opposite the tool drill. The way of "being integrally formed" here appropriately includes the way in which the handle and the outer envelope housing are integrally formed with each other and the way in which the outer envelope housing and the handle are separately formed and subsequently connected together. The first handle end portion is formed at one extended end of the handle, and the second handle end portion is formed at the other extended end of the handle. The first elastic element is disposed between the first handle end portion and the tool body and connects the first handle end portion and the tool body in such a way that the first handle end portion and the tool body can move in the axial direction of the tool bit with each other. The second elastic element is disposed between the second handle end portion and the tool body and connects the second handle end portion and the tool body in such a way that the second handle end portion and the tool body can move in the axial direction of the tool bit with each other. Each of the "first and second elastic elements" in this invention typically represents a compression coil spring, however, suitably includes a spring bundle, torsion spring or rubber.
    According to this invention, with the construction in which the handle integrally formed with the outer casing housing is connected to the tool body by means of the first and second elastic elements in such a way that the handle can move in relation to the housing of outer wrap, the handle integrated with the outer wrap housing can be made vibration proof. In addition, according to this invention, with the construction in which the outer casing housing covers part of the tool body, the impact tool can be reduced in size by reducing an area of a double housing structure, while providing the vibration-proof structure of the handle.
    According to a further embodiment of this invention, the impact tool also has a front end region of the outer wrap housing defined as a region of the outer wrap housing next to the tool bit, an auxiliary handle assembly part provided on an outer surface of the front end region of the outer wrap housing and an auxiliary handle that can be mounted to the auxiliary handle assembly part.
    According to this invention, the auxiliary handle that is supplied separately from the integrally formed handle with the outer casing housing can also have the same vibration-proof effect as the handle.
    According to a further embodiment of this invention, the first elastic element is located closer to a geometric axis of the tool bit than the second elastic element, and has a greater elastic constant than the second elastic element.
    The operation (hammering operation) using the impact tool is carried out with the tool bit pressed against a workpiece. Therefore, with the provision of the first elastic element located closer to the geometric axis of the tool bit and which has a greater elastic constant than the second elastic element, the operation of pressing the tool bit against the workpiece can be performed with stability.
    According to a further embodiment of this invention, the first and second elastic elements have the same specifications, and the first elastic element closest to the geometric axis of the tool drill is mounted under a heavier initial load than the second elastic element. With such a construction, as in the construction described above in which the first and second elastic elements have different spring constants, the operation of pressing the tool bit against the workpiece can be carried out with stability. The state of the elastic element "under initial load" here represents the state in which the elastic element is compressed by applying a load in the direction of compression in a fixed condition.
    According to a further embodiment of this invention, the impact tool also has a front end region of the outer wrap housing which is defined as a region of the outer wrap housing next to the tool bit, a front end region of the tool body which is defined as a region of the tool body covered by the front end region of the outer wrap housing, and a third elastic element which is disposed between an inner peripheral surface of the front end region of the outer wrap housing and a outer peripheral surface of the front end region of the tool body and connects the front end region of the outer wrap housing and the front end region of the tool body in such a way that they can move relative to each other. The "third elastic element" in this invention typically represents a member resembling an elastic ring, however, it also suitably includes a plurality of elastic elements arranged at predetermined intervals in the circumferential direction.
    According to this invention, the front end region of the outer envelope housing can be positioned in the radial direction with respect to the front end region of the tool body through the third elastic element.
    According to a further embodiment of this invention, the third elastic element comprises a plurality of elastic receptors that are arranged at predetermined intervals in a circumferential direction and are maintained in contact with an inner peripheral surface of the front end region of the outer envelope housing and an outer peripheral surface of the front end region of the tool body. The "plurality of elastic receptors" in this invention can be connected together in a ring shape, or can be arranged separately from each other. According to this invention, a communication passage can be formed between the adjacent elastic receptors in such a way that the spaces on both sides of the elastic element between the outer peripheral surface of the tool body and the inner peripheral surface of the outer casing housing communicate with each other in the longitudinal direction through the communication path. Specifically, according to this invention, the cooling air passage can be pivotally formed in such a way that air is admitted through an inlet or an open front end of the outer envelope housing and conducted backwards through the air passage. cooling air in order to cool the drive mechanism and the motor inside the tool body, while elasticly supporting the outer casing housing in relation to the tool body.
    According to a further embodiment of this invention, the impact tool also includes a controller for controlling the motor, and the tool body has a cover member that houses the controller that controls the motor. Specifically, in this invention, with the construction in which the tool body has the cover member and the controller that controls the motor is housed within the cover member, the cover member does not have to be provided with a space to prevent controller interference due to the relative movement of the tool body and the outer casing housing. Therefore, the cover member can be reduced in size, and the controller can be easily protected against vibration.
    According to a further embodiment of this invention, the impact tool also includes a dust collecting passage through which the dust generated by an operation is transferred downstream. In addition, the tool body has a motor housing part that houses the motor, and a cover member that is attached to the motor housing part and covers part of the motor housing part, and the dust collecting passage is arranged inside the motor housing part and the cover member.
    In accordance with this invention, the dust-collecting passage can be attached to the motor housing part and the cover member. Therefore, the motor housing part and the cover member do not need to be provided with a space to prevent interference in the dust collecting passage due to the relative movement of the tool body and the external casing housing. Therefore, the motor housing part and the cover member can be reduced in size.
    According to a further embodiment of this invention, the impact tool also has a first and a second member similar to the plate and a connector member that connects the first and second members similar to the plate in such a way that they can move with each other in a direction in which a distance between opposing plate-like members is changed. In addition, the second elastic element more distant from the tool drill's geometric axis than the first elastic element is arranged between the first and second plate-like members in advance, and the first and second plate-like members are connected by a connector member so that the assembly structure is formed. The mounting structure is arranged between the handle and the tool body, and the first and second members similar to the plate are attached to the handle and the tool body, respectively.
    According to this invention, by providing the second elastic element as a component of the assembly structure, the ease of assembly of the second elastic element to the tool body and the handle can be improved.
    According to a further embodiment of this invention, the impact tool also has a dust-collecting passage that is provided on the side of the tool body and through which the dust generated through an operation is transferred downstream, and a door dust discharge is provided on the side of the handle. In addition, the mounting frame has an opening that connects the dust collection passage and the dust discharge port. With such a construction in which the dust opening is provided in the mounting frame, the mounting frame can absorb the relative movement of the dust collecting passage on the side of the tool body and the dust discharge port on the side of the handle that is caused by vibration. EFFECT OF THE INVENTION
    In accordance with this invention, an impact tool is provided, which is optimized to reduce the size of the entire impact tool, while maintaining the vibration-proof effect of the handle. Other objects, resources and advantages of this invention will be readily understood after reading the following detailed description, along with the drawings and the attached claims. BRIEF DESCRIPTION OF THE DRAWINGS
    Figure 1 is a side view showing the entire structure of a hammer drill, according to an embodiment of this invention.
    Figure 2 is a side sectional view of the hammer drill.
    Figure 3 is a partially enlarged view of Figure 2.
    Figure 4 is a sectional view taken along line A-A in Figure 3.
    Figure 5 is a sectional view taken along line B-B in Figure 3. / X Figure 6 is a sectional view taken along line C-C in Figure 4.
    Figure 7 is an enlarged section view showing part (the front end side) of Figure 2.
    Figure 8 is a sectional view taken along line D-D in Figure 7.
    Figure 9 is a front view showing an assembly structure.
    Figure 10 is a sectional view taken along line E-E in Figure 9.
    Figure 11 is a partial section view showing a modification of an elastic ring. REPRESENTATIVE MODE OF THE INVENTION
    Each of the additional resources and additional method steps presented above and below can be used separately or in conjunction with other resources and method steps to provide improved impact tools and devices used here. Representative examples of this invention, such examples using many of these additional resources and method steps together, will now be described in detail with reference to the drawings. This detailed description is merely intended to teach one skilled in the art additional details to practice the preferred aspects of the present teachings and is not intended to limit the scope of the invention. Only the claims define the scope of the claimed invention. Thus, the combinations of features and steps presented in the following detailed description may not be necessary to practice the invention in the broadest sense, and are instead merely taught to describe particularly representative examples of the invention, with such a detailed description will now be provided with reference to the attached drawings.
    One embodiment of this invention is now described with reference to Figures 1 to 10. In that embodiment, an electric hammer drill is explained as a representative example of an impact tool. As shown in Figures 1 and 2, a hammer drill 101, according to this embodiment, mainly includes an outer housing 102, a body 103 that is partly covered by outer housing 102, a hammer drill 119 that is coupled in a manner detachable to a front end region (left, as seen in the drawings) of the body 103 by means of a hollow tool retainer 137 and a handle 109 which is connected to the outer housing 102 on the opposite side of the hammer drill 119 and designed for be held by a user. The hammer drill 119 is retained by the tool retainer 137 in such a way that it can move linearly in its axial direction with respect to the tool retainer. The outer housing 102, the body 103, the hammer drill 119 and the handle 109 are features that correspond to the “outer wrap housing”, the “tool body”, the “tool drill” and the “handle”, respectively according to this invention. Furthermore, for purposes of convenience of explanation, the side of the hammer drill 119 is seen with the front part and the handle side 109 as the rear part.
    As shown in Figure 2, the body 103 includes a motor housing 105 that houses a drive motor 111, and a gear housing 107 that includes a barrel 106 that houses a drive converter mechanism 113, a percussion mechanism 115 and a energy transmitting mechanism 117. Motor housing 105 and gear housing 107 are connected together by screws or other fastening means. The motor housing 105 is a feature that corresponds to the "motor housing part" according to this invention. The drive motor 111 is arranged in such a way that an output rod 112 (a geometric axis of rotation) of the motor travels in a vertical direction (vertically, as seen in Figure 2) substantially perpendicular to a longitudinal direction of the body 103 (a direction axis of the hammer drill 119). The drive converter mechanism 113 properly converts the torque of the drive motor 111 into linear drive and then transmits it to the percussion mechanism 115. Then, an impact force is generated in the axial direction of the hammer drill 119 (a horizontal direction, as seen in Figure 2) by means of the percussion mechanism 115. The movement converter mechanism 113 and the percussion mechanism 115 are features that correspond to the "percussion mechanism part" according to this invention. gear housing 107 which includes barrel 106 forms the "percussion mechanism part housing region". In addition, the energy transmitting mechanism 117 adequately reduces the torque speed of the drive motor 111 and transmits it to the hammer drill 119 through tool retainer 137, so that the hammer drill 119 is rotated in a circumferential direction . The drive motor 111 is activated when a user presses a trigger 109a disposed on the handle 109.
    As shown in Figure 2, the drive converter mechanism 113 mainly includes a crank mechanism. The crank mechanism includes a drive element in the form of a piston 129 that forms an end movable member of the crank mechanism. When the crank mechanism is pivoted by the drive motor 111, piston 135 is moved linearly in the axial direction of the hammer drill inside a cylinder 141. The energy transmitting mechanism 117 mainly includes a speed reduction mechanism of gear that has a plurality of gears and transmits the torque from the drive motor 111 to the tool retainer 137. In this way, the tool retainer 137 is rotated in a vertical plane and then the hammer drill 119 retained by the tool 137 is also rotated. In addition, the constructions of the drive converter mechanism 113 and the energy transmitting mechanism 117 are well known in the art and, therefore, their detailed description is omitted.
    The striking mechanism 115 mainly includes a striking element in the form of a striker 143 that is slidably disposed within the cylinder bore 141 next to piston 129, and an intermediate element in the form of an impact pin 145 that is disposed slidably inside the tool retainer 137. The striker 143 is driven by pneumatic spring action (pressure oscillations) of a cylinder air chamber 141 through the sliding movement of piston 129. The striker 143 then collides , with (strikes) the impact pin 145. As a result, a impact force caused by the collision is transmitted to the hammer drill 119 through the impact pin 145.
    The hammer drill 101 can be switched between hammer mode in which an operation is performed on a workpiece by applying only a percussive force to the hammer drill 119 in the axial direction, and hammer drill mode in which a operation is performed on a workpiece by applying a tapping force in the axial direction and a rotating force in the circumferential direction to the hammer drill 119. Switching the operating mode between hammer mode and hammer drill mode it is a known technique and is not directly related to this invention and, therefore, its detailed description is omitted.
    In the hammer drill 101 constructed as described above, when the drive motor 111 is driven, the rotating output of the motor is converted into linear motion by means of the drive converter mechanism 113 and then causes the hammer drill 119 to perform linear movement or impact movement in the axial direction by means of the impact mechanism 115. Furthermore, in addition to the impact movement described above, the rotation is transmitted to the hammer drill 119 by means of the energy transmitting mechanism 117 which is driven by the rotating outlet drive motor 111. Thus, hammer drill 119 is caused to rotate in the circumferential direction. Specifically, when operating in hammer drill mode, hammer drill 119 performs the percussion movement in the axial direction and the rotation in the circumferential direction, so that a hammer drill operation is performed on the workpiece. During hammer mode operation, the torque transmission of the energy transmitting mechanism 117 is interrupted by a clutch (not shown). Therefore, the hammer drill 119 is driven to make only the percussion movement in the axial direction so that a hammering operation is performed on the workpiece.
    During the hammering or hammer drill operation described above, in body 103, an impulsive and cyclic vibration is caused mainly in the axial direction of the hammer drill 119. A vibration-proof structure is now explained, which works to prevent or reduce the transmission of vibration from the body 103 to the handle 109.
    As shown in Figures 1 and 2, the outer housing 102 covers one of the body 103, or the barrel 106 and the gear housing 107, which house the percussion mechanism part. The outer housing 102 is divided into two parts, a front part 102F and a rear part 102R. The front 102F extends substantially horizontally in the axial direction of the hammer drill 119 and the rear 102R extends backwards from a rear end of the front 102F and has the handle 109 integrally formed at its rear end. A dividing line (compatible face) is shown and projected by L in Figure 1. In the following description, the front part 102F is referred to as a front housing part and the back part 102R as a rear housing part. In order to assemble the front and rear housing parts 102F, 102R, the compatible faces L (a rear surface of the front housing part 102F and a front surface of the rear housing part 102R) are contiguous with each other and, in that state, a plurality of front and rear connector protrusions 121a, 121b formed on the outer peripheries of the front and rear housing parts are secured and connected by screws 121. The front housing part 102F is configured as a hollow member that has open front and rear ends and a bottom that is opened at a location other than its front end region, and is arranged to cover barrel 106 and part of gear housing 107. In addition, rear housing part 102R is configured as a hollow member having front ends and rear open and an open bottom arranged to cover the gear housing 107.
    As shown in Figures 1 to 3, handle 109 is generally D-shaped, as seen from the side, and has a hollow cylindrical handle region 109A that extends in the vertical direction transverse to the axial direction of the hammer drill 119, and upper and lower connector regions 109B, 109C that extend substantially horizontally forwards from the upper and lower ends of the handle region 109A. The upper connector region 109B and the lower connector region 109C are features that correspond to the "first handle end portion" and the "second handle end portion", respectively, according to this invention.
    In the handle 109 constructed as described above, the upper connector region 109B is elastically connected to an upper portion of the rear surface of the gear housing 107 by means of a first vibration-proof compression coil spring 131, and the lower connector region 109C it is elastically connected to a back cover 108 of the motor housing 105 by means of a second vibration-proof compression coil spring 165. Furthermore, the front housing part 102F of the outer housing 102 is elastically connected to the barrel 106 by means of of an elastic ring 171 (see Figure 7). In this way, the outer housing 102 which includes handle 109 is elastically connected to body 103 at a total of three points, or upper and lower ends of the handle region 109A of handle 109 and a front end region of the front housing part 102F . With such a construction, the outer housing 102 can move in the axial direction of the hammer drill 119 in relation to the body 103. The first compression coil spring 131, the second compression coil spring 165 and the elastic ring 171 are features that correspond to the "first elastic element", the "second elastic element" and the "third elastic element", respectively, according to this invention.
    The structure of each of the elastic connector parts of the outer housing 102 is now explained. The elastic connector part of the upper connector region 109B of handle 109 includes mainly left and right slide guides 123 and first right and left compression coil springs 131. As shown in Figures 4 and 6, slide guides 123 are symmetrically arranged below the geometric axis of the hammer drill 119 in relation to that geometric axis. Each of the two right and left slide guides 123 includes a cylindrical guide 124 integrally formed on an internal surface of the upper connector region 109B, and a guide rod 125 provided on a fixed member 127 (a switch wrap to accommodate a switch for the operating mode switching) which is attached to gear housing 107 by screws 126. Guide rod 125 is slidably adjusted in a bore of cylindrical guide 124. The upper connector region 109B is supported by slide guide 123 in relation to the gear housing 107 and can slide in the axial direction of the hammer drill. A screw 128 is threadably inserted into the guide rod 125 in the longitudinal direction until a head of the screw 128 contacts an end surface of the cylindrical guide 124, so that the guide rod 125 is prevented from sliding out of the cylindrical guide 124.
    As shown in Figures 4 and 5, the first compression coil springs 131 are symmetrically arranged above the geometric axis of the hammer drill 119 in relation to that geometric axis. Each of the first right and left compression coil springs 131 is arranged in such a way that its central geometric axis extends substantially parallel in the axial direction of the hammer drill 119 and is elastically arranged between a spring receiver 133 formed in the member fixed 127 and a spring receiver 135 formed on the inner surface of the upper connector region 109B. Therefore, the first compression coil spring 131 applies a rear spring force to the handle 109. The spring constant of the first compression coil spring 131 is adjusted to be greater than that of the second compression coil spring 165 which is described below.
    An elastic connector portion of the lower connector region 109C of handle 109 includes mainly a slide guide 151 and a mounting structure 161 on which the second compression coil spring 165 is mounted in advance. As shown in Figure 3, the slide guide 151 includes a cylindrical guide rod 152 and a cylindrical guide 153. The cylindrical guide rod 152 is integrally formed on a front end surface of the lower connector region 109C and extends in the axial direction of the hammer drill 119. The cylindrical guide 153 is formed on the rear cover 108 of the motor housing 105 and the guide rod 152 is slidably adjusted on the cylindrical guide 153. The lower connecting region 109C is supported by the slide guide 151 in relation to to the rear cover 108 and can slide in the axial direction of the hammer drill. A screw 154 is threadably inserted into the guide rod 152 in the longitudinal direction until a head of the screw 154 contacts an end surface of the cylindrical guide 153 so that the guide rod 152 is prevented from sliding out of the cylindrical guide 153 Rear cover 108 is provided and configured as a member to cover a rear region of motor housing 105 and is detachably attached to motor housing 105 by screws 108a (see Figure 1). In addition, the back cover 108 houses a controller 155 to control the drive motor. Back cover 108 is a feature that corresponds to the "cover member" according to this invention.
    As shown in Figures 3, 9 and 10, the mounting structure 161 mainly includes generally rectangular front and rear plates 162, 163 which are opposite each other in the axial direction of the hammer drill 119 (in the longitudinal direction), a member similar to generally rectangular tubular bellows 164 that connects both plates 162, 163 in such a way that they can move relative to each other in one direction (the longitudinal direction) in which the distance between the opposite plates changes, and second compression coil springs right and left 165 that are arranged between the front and rear plates 162, 163. The front and rear plates 162, 163 and the bellows-like member 164 are features that correspond to the “first and second members similar to the plate” and to the “member connector ”, respectively, according to this invention.
    As shown in Figure 3, each of the second right and left compression coil springs 165 is received by cylindrical spring receivers 162a, 163a that are formed on opposite surfaces of the front and rear plates 162, 163, and applies a spring force to both plates 162, 163 in the direction that extends the distance between opposing plates 162, 163. In addition, as shown in Figures 9 and 10, a pair of upper and lower latch arms 167 is integrally formed with the rear plate 163 and protrudes towards the front plate 162 between the second right and left compression coil springs 165. A latch claw 167a formed at a projecting end of each latch arm 167 is loosely inserted through a hole 162b on the front plate 162 and engaged with the edge of the hole. In this way, the front and rear plates 162, 163 are mounted in a state where a maximum distance between the opposite plates is defined, while they are subjected to the spring force of the second compression coil spring 165. In addition, the front plates and posterior 162, 163 can move relative to each other in the direction that narrows the distance between the opposing plates by compressing the second compression coil spring 165. In order to assemble the mounting structure 161, the bellows-like member 164 is fitted over the outer edge of both plates 162, 163 in order to cover an outer peripheral region of the front and rear plates 162, 163 between which the second right and left compression coil springs 165 are arranged. The front and rear plates 162, 163 then assembled can move relative to each other by expanding and compressing the second right and left compression coil springs 165 and the bellows-like member 164. Furthermore, as shown in Figure 3 , the cylindrical spring receptacle holes 162a, 163a are designed as an installation space for the slide guide 151.
    A tube junction 169 is formed in the mounting frame 161 and forms part of a dust collection passage 175 which is described below. Tube junction 169 is formed on the front and rear plates 162, 163 and includes cylindrical front and rear parts 169a, 169b that are opposite each other at a predetermined spacing, and a flexible sleeve 169c. The flexible sleeve 169c is fitted on the front and rear cylindrical parts 169a, 169b and covers a region between the cylindrical parts in the circumferential direction. The tube junction 169 allows the front and rear plates 162, 163 to move relative to each other through elastic deformation of the sleeves 169c. Specifically, the mounting frame 161 is configured as an assembly that includes the second compression coil spring 165 and the pipe joint 169. The pipe joint 169 is a feature that corresponds to the “opening to connect the dust collecting passage and the dust discharge port ”according to this invention.
    The assembly structure 161 constructed, as described above, is arranged between the lower connector region 109C and the rear cover 108 of the motor housing 105. In order to assemble the assembly structure 161, one end (right end, as seen in Figure 3) of the bellows-like member 164 is fitted into a mounting opening 157 formed in the lower connector region 109C, and the other end of the bellows-like member 164 is fitted into a mounting opening 158 formed in the back cover 108. the slide guide 151, as shown in Figure 3, the guide rod 152 of the lower connector region 109C is inserted into the cylindrical guide hole 153 of the rear cover 108.
    The elastic connector portion of the front end region of the front housing part 102F includes mainly an elastic ring 171. As shown in Figures 7 and 8, a sleeve 173 is disposed between an inner surface of the front end region of the front housing part 102F the outer housing 102 and an outer surface of the front end region of the barrel 106. Sleeve 173 is retained in surface contact with the inner peripheral surface of the front end region of the front housing part 102F and is retained elastically in contact with the surface outer peripheral region of the front end of barrel 106 by means of elastic ring 171. Elastic ring 171 is produced from rubber and, as shown in Figure 8, elastic ring 171 has a plurality of elastic receptors 171a formed at predetermined intervals in the circumferential direction. The elastic receivers 171a project radially outwardly from an external surface of the elastic ring 171 and are retained in contact with an inner peripheral surface of the sleeve 173. The outer housing 102 is positioned in the radial direction (in the direction transverse to the axial direction of the hammer drill 119) relative to barrel 106 through elastic receptors 171a. In addition, the outer housing 102 is allowed to move relative to the barrel 106 through elastic deformation of the elastic receptors 171a in the axial direction of the hammer drill 119 and in the radial direction. In this way, the elastic ring 171 functions as a vibration-proof member in the axial direction of the hammer drill 119 and in the radial direction. An opening 172 is formed between adjacent elastic receptors between elastic receptors 171a and is surrounded by an outer surface of elastic ring 171, an inner surface of sleeve 173 and side surfaces of elastic receptors 171a. The spaces on both sides of the elastic ring 171 between the outer surface of the barrel 106 and the inner surface of the outer housing 102 that covers the barrel 106 communicate with each other in the longitudinal direction (the axial direction of the hammer drill) through the openings 172. Specifically, when a cooling fan 114 (see Figure 2) to cool the drive motor 111 is activated, air is admitted through an inlet in the form of an opening in the front end of the outer housing 102 that is opened in the side of the outer surface of barrel 106, and then air is conducted backward through space through openings 172. In this way, openings 172 form a cooling air passage. The air conducted through the inlet cools an area surrounding the barrel 106 and then I went back and cooled the drive motor 111. Subsequently, the air is discharged outside the motor housing 105. The front end region of the front housing part 102F and barrel front end region 106 are features that correspond to the "front end region of the outer casing housing" and the "front end region of the tool body", respectively, according to this invention . In addition, elastic receivers 171a can be configured to project radially inward from an internal surface of elastic ring 171.
    A circular side handle assembly part 183 is formed on the outer surface of the front end region of the front housing part 102F covering the front end region of the barrel 106, and a side handle 181 is detachably mounted to the mounting part. side handle 183. Side handle assembly part 183 and side handle 181 are features corresponding to the "auxiliary handle assembly part" and "auxiliary handle", respectively, according to this invention.
    In addition, the hammer drill, according to this modality, has a dust suction device to suck up the dust generated during the drilling operation in a workpiece. For convenience, in relation to the dust suction device, only one dust collector passage 175 is shown in Figures 2 and 3. The dust suction device mainly includes a dust suction unit (not shown) which is mounted to the front end region of the body 103 and sucks the dust generated by the drilling operation, and the dust collector passage 175 (see Figures 2 and 3) which is arranged inside the motor housing 105 in order to transfer the sucked dust by the dust suction unit.
    The dust collection passage 175 mainly includes a front tube 176 that has both ends open and extends into the motor housing 105 in a direction substantially parallel to the axial direction of the hammer drill 119, a rear tube (or a flexible tube) 177 connected to the front tube 176 and a dust discharge port 178 formed in the lower connector region of the handle 109. The front tube 176 is arranged to extend in the longitudinal direction through a space above the engine output rod 112 drive 111. A dust transfer part in the dust suction unit is connected to the front end opening of the front tube 176, and the rear tube 177 is connected to the opening of the rear end of the front tube 176.
    The rear tube 177 connected to the front tube 176 is arranged inside the rear cover 108 of the motor housing 105 and extends downwards and behind a controller 155. A lower end of the rear tube 177 is connected to a connector port (front ) of the pipe junction 169 of the mounting frame 161. In addition, the dust discharge port 178 is formed in the lower connector region 109C of the handle 109 and connected to a rear connector port of the pipe junction 169 when the mounting frame 161 it is mounted to the lower connector region 109C. In addition, a dust collector hose 179 (as shown by the two-point chain line in Figures 2 and 3) of a dust collector is connected to the dust discharge port 178 when the drilling operation is carried out.
    In this embodiment, the outer housing 102 covers the gear housing 107 which includes barrel 106 or the upper body region 103. Specifically, outer housing 102 is separate from motor housing 105, and motor housing 105 is exposed to the outside . With this construction, an area of a double housing structure is reduced so that the external shape size of the hammer drill 101 is reduced.
    Furthermore, in this embodiment, the handle 109 is integrally formed with the outer housing 102 and the side handle 181 is mounted on the front end region of the outer housing 102. The upper connecting region 109B of the handle 109 is elastically connected to the gear housing 107 through the first compression coil spring 131 and the lower connector region 109C is elastically connected to the back cover 108 of the motor housing 105 through the second compression coil spring 165. In addition, the front end of the outer housing 102 is elastically connected to barrel 106 through elastic ring 171. With such construction, the outer housing 102, the handle 109 and the side handle 181 are supported in such a way that they can move in the axial direction of the hammer drill 119 in relation to the body 103. Therefore , when the user grips handle 109 and side handle 181 and perform a hammering or hammer drill operation while pressing the hammer drill 119 against a workpiece, vibration is caused in the axial direction of hammer drill 119, however, the transmission of such vibration to handle 109 and side handle 181 can be reduced by the first compression coil spring 131, the second compression coil spring 165 and elastic ring 171.
    In this embodiment, the first compression coil spring 131 which is arranged in the upper connector region 109B close to the geometric axis of the hammer drill 119 is designed to have a greater spring constant than the second compression coil spring 165 arranged in the region bottom connector 109C and therefore has relatively high spring stiffness. Therefore, the handle 109 is prevented from oscillating in relation to the body 103 in a direction transverse to the longitudinal direction so that the operation of pressing the hammer drill 119 against the workpiece is carried out with stability and the usability of the impact tool is improved . In addition, the first rigid compression coil spring 131 which has a large spring constant is used in the upper connector region to which the large vibration is inserted and the second soft compression coil spring 165 which has a small spring constant is used in the lower connector region to which the small vibration is inserted so that the vibration can be prevented in an optimal way.
    In this modality, the controller that controls the motor 155 mounted on a fixed member of the drive motor 111 is housed inside the rear cover 108 attached to the motor housing 105 so that the controller 155 is integrated with the motor housing 105. In a construction , for example, where the rear cover 108 is integrally formed with the outer housing 102, a space must be provided in the rear cover 108 to prevent the rear cover 108 from interfering with controller 155 due to the relative movement of the motor housing 105 and the outer housing 102. In this embodiment, however, with the construction described above, it is not necessary to provide such space in the back cover 108 so that the impact tool can be reduced in size accordingly.
    In addition, in this modality, the front and rear tubes 176, 177 that form the dust collector passage 175 are housed inside the motor housing 105 and the rear cover 108 and are attached to the motor housing 105 or the rear cover 108. In a construction, for example, in which the back cover 108 is integrally formed with the outer housing 102, a space must be provided in the back cover 108 in order to prevent the back cover 108 from interfering with the front and rear tubes 176, 177 due to relative movement of the motor housing 105 and the external housing 102. In this embodiment, however, with the construction described above, it is not necessary to provide such space in the rear cover 108 so that the impact tool can be reduced in size. In addition, the front and rear tubes 176, 177 do not become misaligned in relation to each other so that the leakage of dust can be effectively prevented.
    In this embodiment, the second compression coil spring 165 and the pipe junction 169 for the dust collector passage 175 are assembled in advance on the assembly structure 161 as its components, and then the assembly structure 161 is assembled between the lower connector region 109C and back cover 108. Therefore, the second compression coil spring 165 and tube junction 169 can be easily assembled.
    In this embodiment, the elastic ring 171 has a plurality of elastic receptors 171a in the circumferential direction and the openings 172 between adjacent elastic receptors 171a are used as a cooling air passage, however, an O-ring 185, as shown in Figure 11 , can be used in place of elastic ring 171. Specifically, O-ring 185 is arranged to be retained in contact with both the outer peripheral surface of barrel 106 and the inner peripheral surface of outer housing 102 around them in the circumferential direction. . With such a construction, the space between barrel 106 and outer housing 102 is closed (sealed) in the longitudinal direction by the O-ring 185 in such a way that dust or the like can be prevented from entering the space from the outside.
    In addition, in this embodiment, elastic receptors 171a arranged at predetermined intervals in the circumferential direction are connected together in a ring shape, however, elastic receptors 171a can be arranged separately from each other in the circumferential direction.
    Furthermore, in this embodiment, the first compression coil spring 131 has a larger spring constant than the second compression coil spring 165. However, in place of such a construction, the first compression coil spring 131 and the second compression coil spring 165 can have the same specifications, and the first compression coil spring 131 can be mounted under a heavier initial load than the second compression coil spring 165 (in the state where the coil spring is compressed by applying a load in the direction of compression in a fixed condition).
    In addition, in this modality, the hammer drill is explained as a representative example of the impact tool, however, this invention can be applied to a hammer that causes the hammer drill 119 to perform only a percussion movement in the axial direction.
    In view of the invention described above, the above aspects can be provided. Aspect 1:
    "The impact tool, as defined in claim 1, in which the handle is integrally formed with the outer casing housing". Aspect 2:
    "The impact tool, as defined in claim 1 or (1), wherein the outer casing housing is divided into front and rear housing parts in the axial direction of the tool drill and the front and rear housing parts are integrally connected ". Aspect 3:
    "The impact tool, as defined in any one of claims 5 and 6 or (1) and (2), wherein the third elastic element connects the front end region of the outer wrap housing and the front end region of the body of tool in such a way that the front end region of the outer casing housing and the front end region of the tool body can move relative to each other in a direction transverse to the axial direction of the tool bit ". Aspect 4:
    "The impact tool, as defined in claim 5 or (3), wherein the third elastic element comprises an O-ring". Aspect 5:
    "The impact tool, as defined in claim 6, wherein an opening is formed between adjacent elastic receptors between the elastic receptors and the spaces between an outer peripheral surface of the tool body and an inner peripheral surface of the outer wrap housing communicate with each other with each other in the axial direction of the tool bit through the opening, and the opening forms a cooling air passage through which the air admitted through the front end region of the outer casing housing is directed backwards ". DESCRIPTION OF THE NUMBERS 101 hammer drill 102 outer housing (outer casing housing) 102F front housing part 102R rear housing part 103 body (tool body) 105 motor housing 106 barrel 107 gear housing 108 rear cover 108a screw 109 handle (handle) 109A handle handle region) handle) 109B upper connector region (first end portion of 109C lower connector region (second end of percussion end) elastic) 109a trigger 111 drive motor (motor) 112 output rod (shaft rotation mechanism) 113 drive converter mechanism (115 percussion mechanism part (percussion mechanism part) 117 energy transmitting mechanism 119 hammer drill (tool drill) 121 screw 121a, 121b connector protrusion 123 slide guide 124 cylindrical guide 125 guide rod 126 screw 127 fixed member 128 screw 129 piston 131 first coil spring compression (first element 133 spring receiver 135 spring receiver 137 tool retainer 141 cylinder 143 striker 145 impact pin 151 slide guide 152 guide rod 153 cylindrical guide 154 screw 155 controller 157, 158 mounting opening 161 mounting frame 162 plate front (plate-like member) 162a cylindrical spring receiver 162b orifice 163 rear plate (plate-like member) 163a cylindrical spring receiver 164 bellows-like member (connector member) 165 second compression coil spring (second elastic element) 167 coupling arm 167a coupling clamp 169 pipe junction (opening) 169a, 169b front and rear cylindrical part 169c sleeve 171 elastic ring (third elastic element) 171a elastic receiver 172 opening (cooling air passage) 173 sleeve 175 collecting passage dust 176 front tube 177 rear tube 178 dust discharge port 179 dust collection hose 181 side handle (auxiliary handle) 183 pa side handle mounting bracket (auxiliary handle assembly part) 185 O-ring
    权利要求:
    Claims (10)
    [0001]
    1. Impact tool (101) comprising: a impact mechanism part (113, 115) that strikes a tool bit (119) in an axial direction of the tool bit (119), a motor (111) that drives the part of the impact mechanism (113, 115) and is arranged in such a way that a geometric axis of rotation of the motor (111) crosses the axial direction of the tool bit (119), a tool body (103) including a part motor housing (105) which houses the motor (111) and a gear housing (107), including a barrel (106) which houses the impact mechanism part (113, 115), and the tool body (103 ) has a front end region to which the tool bit (119) is demountable, an outer casing housing (102) that covers part of the tool body (103), a handle (109) that is designed to be held by a user and fully formed with the outer wrap housing (102) on an opposite side of the tool bit (119) and extends transversely to the axial direction of the tool bit (119), a first handle end portion (109B) formed at an extended end of the handle (109), a second handle end portion (109C) formed at the other extended end of the handle (109), a first elastic element (131) which is disposed between the first handle end portion (109B) and the tool body (103) and connects the first end portion handle (109B) and the tool body (103) such that the first handle end portion (109B) and the tool body (103) can move in the axial direction of the tool bit (119) relative to one another, and a second elastic element (165) which is disposed between the second handle end portion (109C) and the tool body (103) and connects the second handle end portion (109C) and the handle body tool (103) such that the second well handle end section (109C) and the tool body (103) can move in the axial direction of the tool bit (119) relative to each other, FEATURED by the fact that the outer casing housing (102) is separated the motor housing part (105), and the motor housing part (105) is exposed to the outer surface.
    [0002]
    2. Impact tool (101) according to claim 1, CHARACTERIZED by the fact that it further comprises: a front end region of the outer casing housing (102F) defined as a region of the outer casing housing next to the drill bit tool (119), an auxiliary handle assembly part (183) provided on an outer surface of the front end region of the outer envelope housing (102F), and an auxiliary handle (181) that can be mounted to the assembly part of auxiliary handle (183).
    [0003]
    Impact tool (101) according to claim 1 or 2, CHARACTERIZED by the fact that the first elastic element (131) is located closer to a geometric axis of the tool drill (119) than the second element elastic (165), and has a greater elastic constant than the second elastic element (165).
    [0004]
    4. Impact tool (101), according to claim 1 or 2, CHARACTERIZED by the fact that the first and second elastic elements (131, 165) have the same specifications, and the nearest elastic element (131) to the geometric axis of the tool drill (119) than the second elastic element (165) is mounted under a heavier initial load than the second elastic element (165).
    [0005]
    Impact tool (101) according to any one of claims 1 to 4, CHARACTERIZED by the fact that it further comprises: a front end region of the outer casing housing (102F) which is defined as a region of the housing outer wrap next to the tool drill (119), a front end region of the tool body that is defined as a region of the tool body (103) covered by the front end region of the outer wrap housing (102F), a third elastic element (171) which is disposed between an inner peripheral surface of the front end region of the outer casing housing (102F) and an outer peripheral surface of the front end region of the tool body and connects the front end region of the tool housing outer wrap (102F) and the front end region of the tool body such that the front end region of the wrap housing external sensor (102F) and the tool body (103) move in relation to each other.
    [0006]
    6. Impact tool (101), according to claim 5, CHARACTERIZED by the fact that the third elastic element (171) comprises a plurality of elastic receptors (171a) that are arranged at predetermined intervals in a circumferential direction and retained in contact with an inner peripheral surface of the front end region of the outer casing housing (102F) and an outer peripheral surface of the front end region of the tool body.
    [0007]
    Impact tool (101) according to any one of claims 1 to 6, CHARACTERIZED by the fact that it additionally comprises a controller (155) to control the motor (111), in which the tool body (103) has a cover member (108) that houses the controller that controls the motor (155).
    [0008]
    8. Impact tool (101) according to any one of claims 1 to 7, CHARACTERIZED by the fact that it comprises a dust collector passage (175) through which the dust generated by an operation is transferred downstream, in which the tool body (103) includes a motor housing part (105) which houses the motor (111), and a cover member (108) which is attached to the motor housing part (105) and covers part of the part motor housing (105), and the dust collection passage (175) is arranged inside the motor housing part (105) and the cover member (108).
    [0009]
    Impact tool (101) according to any one of claims 1 to 8, CHARACTERIZED by the fact that it further comprises: first and second plate-like members (162, 163) opposite each other, and a connector member (164 ) that connects the first and second members similar to the plate (162, 163) in such a way that the members similar to the plate (162, 163) can move relative to each other in a direction where a distance between similar members to the opposing plate changes, where: the second elastic element (165) further from the geometric axis of the tool drill (119) than the first elastic element (131) is disposed between the first and second members similar to the plate (162 , 163) in advance, and the first and second plate-like members (162, 163) are connected by the connector member (164) so that a mounting frame (161) is formed, and on which the mounting frame is arranged between the handle (109) and the tool body (103) and the first and second members similar to the plate (162, 163) are attached to the handle (109) and the tool body (103), respectively.
    [0010]
    10. Impact tool (101) according to claim 9, CHARACTERIZED by the fact that it additionally comprises a dust collector passage (175) that is provided on the side of the tool body (103) and through which the generated dust by an operation it is transferred downstream, and a dust discharge port (178) provided on the side of the handle (109), in which the mounting structure (161) has an opening (169) that connects the dust collector passage ( 175) and the dust discharge port (178).
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    同族专利:
    公开号 | 公开日
    US9999967B2|2018-06-19|
    WO2011077824A1|2011-06-30|
    US20160001433A1|2016-01-07|
    CN102666029A|2012-09-12|
    RU2563417C2|2015-09-20|
    JP2011131364A|2011-07-07|
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    EP2468455A1|2012-06-27|
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    US20120279740A1|2012-11-08|
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    JP5502458B2|2014-05-28|
    EP2468455A4|2014-02-26|
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    法律状态:
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-10-01| B06U| Preliminary requirement: requests with searches performed by other patent offices: suspension of the patent application procedure|
    2020-06-02| B09A| Decision: intention to grant|
    2020-10-27| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 27/10/2020, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2009295405A|JP5502458B2|2009-12-25|2009-12-25|Impact tool|
    JP2009-295405|2009-12-25|
    PCT/JP2010/068749|WO2011077824A1|2009-12-25|2010-10-22|Striking tool|
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