JP6348337B2 - Reciprocating work tool - Google Patents

Description

  The present invention relates to a reciprocating work tool that performs a predetermined machining operation.

  Japanese Patent Application Laid-Open No. 2010-052115 describes a striking tool that drives a tool bit linearly in the long axis direction by a swing member. The impact tool is provided with a dynamic vibration absorber for reducing vibration generated when the impact tool is driven.

JP 2010-052115 A

  In a reciprocating work tool such as the above-described striking tool, the worker grips the handle and performs the striking work, and therefore vibrations generated during the striking work are transmitted to the worker. On the other hand, in order to improve workability, it is preferable that the vibration transmitted to the worker is small. Therefore, regarding the vibration reduction technology of the reciprocating work tool, not only a vibration reduction mechanism including a weight such as a dynamic vibration absorber is provided, but further improvement is desired. Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide an improved technique relating to vibration reduction of a reciprocating work tool.

The above problems are solved by the present invention. According to a preferred embodiment of the reciprocating work tool according to the present invention, a reciprocating work tool is constructed in which a tip tool moves linearly on a predetermined axis. The reciprocating work tool includes a motor, a drive mechanism that is driven by the motor and drives the tip tool, a main body housing that houses the drive mechanism, a handle that is coupled to the main body housing so as to be relatively movable, A biasing member that applies a biasing force between the housing and the handle, a weight housed in the main body housing and movable relative to the main body housing, and a weight drive that drives the weight so as to move relative to the main body housing A mechanism and a side handle mounting portion to which the side handle is mounted. The main body housing may house not only the drive mechanism but also a motor. As a reciprocating work tool, an electric hammer, an electric hammer drill, or the like as a hammering tool that performs a hammering operation by moving a hammer bit on a predetermined axis, or a cutting blade is moved by a saw blade on a predetermined axis. An electric jigsaw or reciprocating saw as a cutting tool is preferably included. The predetermined axis is set corresponding to the work tool, and typically, the predetermined axis is set as the long axis of the tool holder that holds the tip tool. Furthermore, it is preferable that the tip tool is configured as a long bit, and the predetermined axis is set to coincide with the long axis of the bit. Further, the weight is accommodated in the main body housing by being disposed in the main body housing.
The drive mechanism includes a first rotating shaft that is driven by a motor and a first rocking member that is rocked by the rotation of the first rotating shaft. Then, the drive mechanism linearly moves the tip tool by the swing of the first swing member.
On the other hand, the weight driving mechanism includes a second rotating shaft that is driven by a motor and a second swinging member that is swung by the rotation of the second rotating shaft. That is, a second swing member different from the first swing member is provided. The weight driving mechanism linearly moves the weight by the swing of the second swing member. The weight may be directly connected to the second swing member, or an interposition member such as an elastic member may be interposed between the weight and the second swing member.
In addition, the handle moves relative to the main body housing in a state where the urging force of the urging member is applied to the handle, so that vibration transmitted from the main body housing to the handle during operation is suppressed. That is, the handle is configured as an anti-vibration handle in which vibration transmitted from the main body housing is reduced by elastic deformation of the biasing member.
Further, the side handle mounting portion is configured to be movable relative to the main body housing.

  According to the present invention, the weight suppresses vibration generated in the main body housing during operation, and is transmitted from the main body housing to the handle by moving relative to the main body housing while the handle is biased by the biasing member. To suppress vibration. In other words, the reciprocating work tool according to the present invention has two vibration reduction mechanisms. Thereby, during the work, the vibration of the gripping part gripped by the worker is reduced. As a result, the operability of the reciprocating work tool is improved and the workability of the operator is improved. In addition, since the tip tool and the weight are individually driven by the two swing members, the relationship between the tip tool drive phase and the weight drive phase can be set rationally. That is, the vibration generated by driving the tip tool is effectively reduced by driving the weight.

In the reciprocating work tool according to the present invention, the first rotating shaft and the second rotating shaft are integrally formed coaxially. That is, typically, the first rotation axis and the second rotation axis are configured as a single axis. The first rotating shaft and the second rotating shaft may be configured as separate shafts connected coaxially. When the first rotation axis and the second rotation axis are configured as a single axis, a part of the single axis functions as the first rotation axis and the other part of the single axis is the first axis. It functions as a 2 rotation axis. Thereby, the 1st rotating shaft and the 2nd rotating shaft are rationally driven.
In the power tool according to or the invention, the first oscillating member, a first shaft portion extending from the first rotating portion and the first rotating portion which is rotated in a first rotational axis Have. On the other hand, the second rocking member has a second rotating part that is rotated by the second rotating shaft and a second shaft part that extends from the second rotating part. The first rotating part and the second rotating part are connected via a cam.

  According to the further form of the reciprocating tool according to the present invention, the drive of the first swing member and the drive of the second swing member are set so that the phases are different from each other. Specifically, the first oscillating member oscillates in parallel with a predetermined axis between the first position and the second position separated from the tip tool from the first position, with the first rotating shaft as a fulcrum. To do. On the other hand, the second oscillating member oscillates in parallel with a predetermined axis line between the third position and the fourth position spaced from the tip tool from the third position, with the second rotating shaft as a fulcrum. And when the 1st rocking member is located in the 1st position, the 2nd rocking member is constituted so that it may be located in positions other than the 3rd position. The first position is also referred to as a front position as a position on the tip tool side that is attached to the tip region of the main body housing in the movement range of the first swing member. The second position is also referred to as a rear position with respect to the first position. Similarly, the third position is also referred to as a front position in the movement range of the second swing member, and the fourth position is also referred to as a rear position with respect to the third position. Thus, the drive of the first swing member and the drive of the second swing member are set as different phases. When the drive of the first swing member and the drive of the second swing member are in phase, there is a possibility that the effect of reducing the vibration of the weight driven by the second swing member may not be sufficiently exhibited. Therefore, the driving of the first rocking member and the driving of the second rocking member are set as different phases, so that vibration reduction by the weight is efficiently achieved. Preferably, when the first swing member is located at the first position, the second swing member is located at a position close to the fourth position.

According to the further form of the reciprocating work tool which concerns on this invention , the 1st axial part and the 2nd axial part projected the 1st axial part and the 2nd axial part on the plane orthogonal to a predetermined axis line, respectively. The one projection line and the second projection line are arranged at a predetermined angle. Therefore, in the configuration in which the first swing member and the second swing member swing in the predetermined axial direction, interference between the first swing member and the second swing member is avoided.

  According to the further form of the reciprocating work tool according to the present invention, the weight is provided so as to move linearly in parallel with a predetermined axis. Thereby, the vibration generated by driving the tip tool that reciprocates on a predetermined axis is effectively reduced by the weight.

  According to the further form of the reciprocating work tool according to the present invention, the drive mechanism includes a piston driven by the first swing member and a cylinder that slidably accommodates the piston. Typically, the axial direction of the cylinder is set in parallel with a predetermined axial direction. The weight is disposed outside the cylinder with respect to the radial direction of the cylinder. Typically, the cylinder has a rotating cylinder portion that can be rotated together with the tip tool, and a fixed cylinder portion that rotatably holds the rotating cylinder with respect to the main body housing. Arranged outside. In the work tool, the space between the cylinder and the main body housing tends to be an empty space. Therefore, the weight is rationally arranged in the main body housing by arranging the weight outside the cylinder.

  According to the further form of the reciprocating work tool according to the present invention, the weight is formed so as to surround at least a part of the fixed cylinder portion in a cross section orthogonal to the axial direction of the cylinder. The weight may be formed in an annular shape so as to surround the entire circumference of the fixed cylinder portion. Since the weight surrounds the cylinder portion, the weight is guided and slid outside the cylinder portion. Therefore, when the weight driving mechanism moves the weight along the cylinder, the weight is rationally driven linearly. It is preferable to have a guide member that guides the movement of the weight. Note that the outer surface of the cylinder may function as a guide member, or a guide member other than the cylinder may be provided.

  According to the further form of the reciprocating work tool which concerns on this invention, a drive mechanism has a rotation transmission mechanism which transmits rotation of a motor to a tip tool, and rotates a tip tool. The reciprocating work tool includes a rotational drive mode in which the tip tool is rotated and a linear drive mode in which the tip tool is linearly driven on at least a predetermined axis. In the rotation drive mode, the tip tool is rotated by the rotation transmission mechanism. On the other hand, in the linear drive mode, the tip tool is linearly driven by the first rotating shaft. In the linear drive mode, the tip tool may be further rotated by the rotation transmission mechanism. Typically, the reciprocating work tool is configured as an impact tool. Therefore, the rotational drive mode is also called a drill mode, and the linear drive mode is also called a hammer mode. Furthermore, the reciprocating work tool has a mode switching device that switches between a rotational drive mode and a linear drive mode. The mode switching device cuts off power transmission between the first rotation shaft, the second rotation shaft, and the motor when the mode is switched from the linear drive mode to the rotation drive mode. In the rotational drive mode in which the tip tool is not driven linearly, it is less necessary to make the weight function as a counterweight. Therefore, in the rotational drive mode, power transmission between the motor and the first rotary shaft that drives the tip tool linearly is cut off, and power transmission between the second rotary shaft that drives the weight and the motor is also cut off. . Thereby, the second rotating shaft and the weight are rationally driven.

  According to the further form of the reciprocating work tool according to the present invention, the side handle mounting portion is coupled to the handle. The biasing member is configured to apply a biasing force between the main body housing and the handle and side handle mounting portion.

  According to the present invention, an improved technique relating to vibration reduction of a reciprocating work tool is provided.

It is a side view of the hammer drill concerning a 1st embodiment of the present invention. It is sectional drawing which shows the internal structure of a hammer drill. It is a side view which shows a part of internal structure of a hammer drill. It is a perspective view of the internal structure of the hammer drill in FIG. It is the VV sectional view taken on the line of FIG. FIG. 4 is a cross-sectional view of the internal structure of FIG. 3 switched to drill mode. It is an exploded side view of a hammer drill. It is the VIII-VIII sectional view taken on the line of FIG. It is the IX-IX sectional view taken on the line of FIG. It is a side view which shows the state in which a hand grip is located ahead. It is sectional drawing which shows a part of internal structure of the hammer drill which concerns on 2nd Embodiment of this invention. It is a side view which shows a part of internal structure of a hammer drill. It is a perspective view of the internal structure of the hammer drill in FIG. It is the XIV-XIV sectional view taken on the line of FIG.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The first embodiment will be described using a hammer drill as an example of a reciprocating work tool. As shown in FIG. 1, the hammer drill 100 according to the first embodiment has a hammer bit 119 mounted on the tip region of the main body 101, and the hammer bit 119 mounted is subjected to a striking operation in the major axis direction, so that the workpiece is processed. It is a reciprocating work tool that performs a chipping operation on (for example, concrete). The hammer bit 119 is detachably attached to the main body 101 via a cylindrical tool holder 131. The hammer bit 119 is inserted into the bit insertion hole of the tool holder 131 and is held with respect to the tool holder 131 in a state where relative rotation in the circumferential direction around the major axis direction of the tool holder 131 is restricted. The This hammer bit 119 is an implementation configuration example corresponding to the “tip tool” in the present invention. Further, the long axis of the tool holder 131 is an implementation configuration example corresponding to the “predetermined axis” in the present invention. Note that the long axis of the tool holder 131 coincides with the long axis of the hammer bit 119. A side grip 900 is detachably attached to the hammer drill 100. In the drawings other than FIGS. 1, 7, and 10, the side grip 900 is omitted for convenience.

  As shown in FIG. 2, the main body 101 is mainly configured by a main body housing 103 and a hand grip 109. The main body housing 103 includes a motor housing 103A and a gear housing 103B. The motor housing 103A accommodates the electric motor 110. In the electric motor 110, the motor shaft 111 is arranged in parallel with the long axis of the hammer bit 119. The gear housing 103 </ b> B houses the first motion conversion mechanism 120, the striking element 140, the rotation transmission mechanism 150, and the second motion conversion mechanism 220. The motor housing 103A and the gear housing 103B are joined to each other in the major axis direction of the hammer bit 119 and arranged in series. This main body housing 103 is an implementation structural example corresponding to the "main body housing" in this invention. Moreover, the electric motor 110 is an implementation structural example corresponding to the "motor" in this invention.

  A hand grip 109 is connected to the rear end region of the main body housing 103 opposite to the front end region. That is, the hand grip 109 is disposed on the opposite side of the main body housing 103 from the hammer bit 119 with respect to the longitudinal direction of the hammer bit 119. In the first embodiment, for convenience, with respect to the long axis direction of the hammer bit 119 (the long axis direction of the main body 101), the hammer bit 119 side is referred to as the front side, and the hand grip 109 side is referred to as the rear side. Accordingly, the left-right direction in FIGS. 1 to 3 corresponds to the front-rear direction of the hammer drill 100, and the up-down direction corresponds to the up-down direction of the hammer drill 100. Further, the left-right direction in FIG. 5 corresponds to the left-right direction of the hammer drill 100 orthogonal to the major axis direction of the hammer bit 119, and the vertical direction corresponds to the vertical direction of the hammer drill 100.

  The rotation of the electric motor 110 is transmitted to the first motion conversion mechanism 120, converted into a linear motion by the first motion conversion mechanism 120, then transmitted to the striking element 140, and the hammer is transmitted via the striking element 140. The bit 119 is hit in the long axis direction. The rotation of the electric motor 110 is transmitted to the tool holder 131 via the rotation transmission mechanism 150, and the hammer bit 119 is rotated around the major axis via the tool holder 131. Furthermore, after the rotation of the electric motor 110 is transmitted to the second motion conversion mechanism 220, it is converted into a linear motion by the second motion conversion mechanism 220 and transmitted to the counterweight 160 (see FIG. 5).

  As shown in FIG. 2, the first motion conversion mechanism 120 is mainly configured by an intermediate shaft 121, a first rotating body 123, a first swing member 125, a piston 127, and a cylinder 129. The intermediate shaft 121 is arranged in parallel with the motor shaft 111 and is rotated by being engaged with a pinion gear provided at the tip of the motor shaft 111. The first rotating body 123 can rotate integrally with the intermediate shaft 121 and is arranged coaxially with the intermediate shaft 121. As shown in FIG. 3, the first rotating body 123 includes a front engaging recess 123 a that can engage with a rotation transmitting member 157 for transmitting the rotation of the intermediate shaft 121 to the first rotating body 123, and a second rotation. A rear engagement recess 123b that can engage with the body 223 is formed. The front side engaging recess 123a is formed as a spline groove. Further, the rear engagement recess 123b is formed as a cam groove.

  As shown in FIG. 2, the 1st rocking | fluctuation member 125 is comprised by the axial part 125a and the rotary body connection part 125b. The rotating body connecting portion 125b and the first rotating body 123 can rotate relative to each other. Accordingly, when the first rotating body 123 is rotated by the intermediate shaft 121 via the rotation transmitting member 157, the shaft portion 125a connected to the rotating body connecting portion 125b swings in the long axis direction of the hammer bit 119. . That is, the first swing member 125 swings in the front-rear direction. A piston 127 is attached to the distal end portion of the shaft portion 125 a of the first swing member 125. The shaft portion 125a and the piston 127 are connected so as to be relatively rotatable. The piston 127 is slidably disposed in a cylinder 129 disposed coaxially with the tool holder 131. Thereby, the rotation of the motor shaft 111 is converted into a linear motion of the piston 127 in the long axis direction (front-rear direction) of the hammer bit 119, and the piston 127 reciprocates in the front-rear direction. That is, the piston 127 and the tip end portion of the shaft portion 125a of the first swing member 125 reciprocate between the front position and the rear position.

  The striking element 140 is mainly composed of a striker 143 as a striker and an impact bolt 145 as a meson. The striker 143 is slidably disposed inside the piston 127. When the first motion conversion mechanism 120 is driven, the piston 127 slides with respect to the cylinder 129, thereby causing the striker 143 to act via the action of the air spring (air fluctuation) of the air chamber 127 a formed inside the piston 127. Is driven. Thereby, the striker 143 collides with the impact bolt 145 and hits the hammer bit 119 via the impact bolt 145. This 1st motion conversion mechanism 120 and the striking element 140 are the implementation structural examples corresponding to the "drive mechanism" in this invention.

  The rotation transmission mechanism 150 is mainly composed of a first gear 151 and a second gear 153. The first gear 151 is attached to the intermediate shaft 121 and rotates integrally with the intermediate shaft 121. The second gear 153 is attached to the cylinder 129 and rotates integrally with the cylinder 129. The cylinder 129 is connected to the tool holder 131 so as to rotate integrally with the tool holder 131. The first gear 151 and the second gear 153 are engaged with each other, and the rotation of the first gear 151 is transmitted to the second gear 153. Thereby, the rotation of the intermediate shaft 121 (rotation of the motor shaft 111) is transmitted to the tool holder 131 via the cylinder 129, and the hammer bit 119 is rotated around the long axis. This rotation transmission mechanism 150 is an implementation configuration example corresponding to the “rotation transmission mechanism” in the present invention.

  As shown in FIG. 2, the second motion conversion mechanism 220 is disposed between the first motion conversion mechanism 120 and the electric motor 110 with respect to the major axis direction of the hammer bit 119. The second motion conversion mechanism 220 is mainly composed of an intermediate shaft 121, a second rotating body 223, and a second swing member 225. That is, the intermediate shaft 121 constitutes the rotation axis of the first motion conversion mechanism 120 and the rotation axis of the second motion conversion mechanism 220. The intermediate shaft 121 includes a first intermediate shaft as an intermediate shaft of the first motion conversion mechanism 120 and a second intermediate shaft as an intermediate shaft of the second motion conversion mechanism 220 different from the first intermediate shaft. The first intermediate shaft and the second intermediate shaft may be connected by connecting means. In this case, the first intermediate shaft and the second intermediate shaft may be arranged coaxially or in parallel.

  The second rotating body 223 can rotate integrally with the intermediate shaft 121 and is disposed coaxially with the intermediate shaft 121. As shown in FIG. 3, the second rotating body 223 is formed with an engaging convex portion 223 a that can be engaged with the rear engaging concave portion 123 b of the first rotating body 123. Therefore, the rear engagement concave portion 123b and the engagement convex portion 223a form a cam. Thereby, the rotation of the first rotating body 123 (the rotation of the intermediate shaft 121) is transmitted to the second rotating body 223 via the cam.

  As shown in FIGS. 2 and 5, the second swing member 225 includes a shaft portion 225a and a rotating body connecting portion 225b. The rotating body connecting portion 225b and the second rotating body 223 can be rotated relative to each other. Therefore, when the second rotating body 223 is rotated by the intermediate shaft 121 via the first rotating body 123 and the rotation transmitting member 157, the shaft portion 225a connected to the rotating body connecting portion 225b becomes the length of the hammer bit 119. Swings in the axial direction. That is, the second swing member 225 swings in the front-rear direction.

  As shown in FIG. 5, a counterweight 160 is rotatably connected to the distal end portion of the shaft portion 225 a of the second swing member 225. Therefore, the counterweight 160 is reciprocated linearly in the front-rear direction by the swing of the second swing member 225. That is, the tip end portion of the shaft portion 225a of the second swing member 225 reciprocates between the front position and the rear position. That is, the second motion conversion mechanism 220 drives the counterweight 160. The counter weight 160 and the second motion conversion mechanism 220 are implementation configuration examples corresponding to the “weight” and the “weight drive mechanism” in the present invention, respectively.

  As shown in FIGS. 2 to 5, a cylinder holding member 170 is provided in the gear housing 103 </ b> B. The cylinder holding member 170 is mainly composed of a first cylinder part 171, a second cylinder part 173, a guide part 175, and a housing connecting part 177.

  As shown in FIG. 2, the first cylinder portion 171 and the second cylinder portion 173 are formed in a substantially cylindrical shape and are arranged coaxially with the tool holder 131 and the cylinder 129. The internal space of the first cylinder portion 171 is configured as a moving region of the shaft portion 125 a of the first swing member 125. The second cylinder part 173 is provided in front of the first cylinder part 171 and has an outer diameter larger than the outer diameter of the first cylinder part 171. The outer peripheral portion of the second cylinder portion 173 is fixed to the gear housing 103B. A bearing 174 is provided on the inner peripheral portion of the second cylinder portion 173, and the rear end region of the cylinder 129 is rotatably held via the bearing 174. The cylinder 129 and the cylinder holding member 170 are an implementation configuration example corresponding to the “cylinder” in the present invention. Further, the cylinder 129 and the first cylinder portion 171 are implementation configuration examples corresponding to the “rotating cylinder portion” and the “fixed cylinder portion” in the present invention, respectively.

  As shown in FIGS. 4 and 5, the guide portion 175 is provided on the outer peripheral portion of the first cylinder portion 171 and is formed in a cylindrical shape along the first cylinder portion 171. The internal space of the guide portion 175 is configured as a moving region of the shaft portion 225a of the second swing member 225. As shown in FIG. 5, a counterweight 160 is disposed inside the guide portion 175. The counterweight 160 is configured as a long member having a predetermined length along the axis of the guide portion 175. The counter weight 160 is connected to the shaft portion 225a, and is moved in the long axis direction of the hammer bit 119 (the axial direction of the first cylinder portion 171) in the guide portion 175 by the swing of the second swing member 225. The Therefore, the counterweight 160 is disposed between the gear housing 103 </ b> B and the first cylinder portion 171 with respect to the radial direction of the first cylinder portion 171. Further, the counterweight 160 is disposed between the electric motor 110 and the first motion conversion mechanism 120 with respect to the long axis direction of the hammer bit 119. This guide part 175 is an implementation structural example corresponding to the "guide member" in this invention.

  As shown in FIG. 2, the housing connecting portion 177 is an area where the cylinder holding member 170 is connected to the main body housing 103B. The housing connecting part 177 is fixed to the main body housing 103B via an O-ring 177a. A bearing that supports the motor shaft 111 is attached to the housing connecting portion 177.

  The first swing member 125 connects the center of the intermediate shaft 121 and the center of the cylinder 129 (center of the first cylinder portion 171) in a cross section orthogonal to the long axis direction of the hammer drill 100 (long axis direction of the hammer bit 119). It extends on a straight line. That is, the first swing member 125 extends in the vertical direction of the hammer drill 100. On the other hand, the second swing member 225 extends on a straight line connecting the center of the intermediate shaft 121 and the center of the guide portion 175, as shown in FIG. In other words, the second swing member 225 extends in a direction inclined in the vertical direction of the hammer drill 100. In other words, since the guide part 175 is provided in the outer peripheral part of the 1st cylinder part 171, the 2nd rocking | swiveling member 225 (shaft part 225a) extends on the plane orthogonal to the major axis direction of the hammer drill 110. When a straight line and a straight line extending from the first swing member 125 (shaft portion 125a) are projected, the shaft portion 225a and the shaft portion 125a are set to form a predetermined angle (45 degrees in this embodiment). ing. Thus, with respect to the long axis direction of the hammer drill 100, the inner region of the first cylinder portion 171 is arranged so that the moving region of the shaft portion 125a of the first rocking member 125 and the moving region of the shaft portion 225a of the second rocking member 225 do not overlap. And set to the outside respectively. As a result, the first swing member 125 and the second swing member 225 are rationally arranged so as not to interfere with each other.

  Further, the first swing member 125 and the second swing member 225 are set so as to move in substantially opposite directions. In other words, the swing of the first swing member 125 and the swing of the second swing member 225 have different phases. That is, when the distal end portion of the shaft portion 125a of the first swing member 125 is located at the front position in the movement region of the distal end portion, the distal end portion of the shaft portion 225a of the second swing member 225 is the distal end portion. It is located at a position other than the front position in the movement area. Thereby, when the striker 143 moves forward by the action of the air chamber 127a in the piston 127, the counterweight 160 moves backward, and when the striker 143 moves backward, The driving of the first swing member 125 and the second swing member 225 is set so that the counterweight 160 moves forward.

  As shown in FIG. 1, the handgrip 109 is formed as a resin main handle for an operator to hold the hammer drill 100, and mainly includes a handle rear side portion 350 and a handle front side portion 355. . As shown in FIG. 7, the handle rear side portion 350 is mainly configured by a grip portion 351 held by an operator and a cylindrical housing portion 352 disposed in front of the grip portion 351. The grip part 351 has a grip part base end part 351A1 at the upper end of the grip part 351 connected to the rear end part of the housing part 352, and extends downward from the grip part base end part 351A1 so as to intersect the major axis direction of the hammer bit 119. It is provided to extend. The grip portion tip portion 351A2 at the lower end of the grip portion 351 is configured as a free end, and a power cable for supplying current to the electric motor 110 is provided. The grip portion 351 is provided with a trigger 309a. When the trigger 309a is operated, a current is supplied from the external power source to the electric motor 110, and the electric motor 110 is driven. Further, the housing portion 352 is provided with an engaging convex portion 353 projecting forward. This hand grip portion 109 is an implementation configuration example corresponding to the “handle” in the present invention.

  As shown in FIG. 7, the handle front side portion 355 mainly includes a side handle mounting portion 356 to which the side handle 900 is attached, and an extending portion 357 disposed behind the side handle mounting portion 356. The side handle mounting portion 356 is configured as an annular member surrounding the tip region (region on the hammer bit 119 side) of the gear housing 103B. In addition, the extending portion 357 is provided with an engaging concave portion 358 that can be engaged with the engaging convex portion 353.

  As shown in FIGS. 2 and 7 to 9, the motor housing 103 </ b> A is provided with a plurality of sliding guides 306. The plurality of sliding guides 306 are arranged at a plurality of positions on the outer periphery of the motor housing 103 </ b> A (electric motor 110) with respect to the circumferential direction around the major axis direction of the hammer bit 119. In addition, the sliding guide 306 is disposed at two locations on the front and rear sides with respect to the longitudinal direction of the hammer bit 119. That is, the front sliding guide 306 and the rear sliding guide 306 are respectively arranged at a plurality of positions on the outer periphery of the motor housing 103A (electric motor 110) with respect to the circumferential direction around the long axis direction of the hammer bit 119. . The sliding guide 306 is formed by a metal cover that covers a resin convex portion formed on the surface of the motor housing 103A. The metal cover is made of a metal such as carbon steel, aluminum, magnesium, or titanium. Further, a plurality of coil springs 360 are arranged on the outer periphery of the motor housing 103A.

  As shown in FIGS. 8 and 9, a plurality of concave portions 354 a corresponding to the respective sliding guides 306 and a plurality of pressing portions 354 b corresponding to the respective coil springs 360 are formed on the inner peripheral surface of the housing portion 352. Has been. The recess 354a is formed of a resin as a part of the housing part 352. The recess 354a (housing 352) is formed of a resin material such as PA6 nylon. Further, as shown in FIG. 2, a contact portion 354c that can contact the sliding guide 306 is formed at the rear end portion of the recess 354a. Furthermore, a contact portion 359a that can contact the front end portion of the gear housing 103B is formed at the front end portion of the side handle mounting portion 356.

  1, the handle rear side portion 350 is moved from the rear with respect to the main body housing 103 and the handle front side portion 355 is moved from the front with respect to the main body housing 103, as shown in FIG. By being connected by the convex portion 353 and the engaging concave portion 358, it is assembled to the outside of the main body housing 103. That is, the hand grip 109 is disposed so that the housing portion 352 covers the motor housing 103A, and the extending portion 357 is disposed along the gear housing 103B. At this time, the housing portion 352 is disposed outside the motor housing 103A so that the concave portion 354a engages with the sliding guide 306 and the pressing portion 354b presses the coil spring 360. That is, the coil spring 360 is supported in a state in which one end abuts on the motor housing 103 </ b> A and the other end abuts on the pressing portion 354 b of the housing portion 352 and urges the handle rear side portion 350. The handle rear side portion 350 is pressed rearward by the coil spring 360. At this time, the contact portion 359a of the handle front side portion 355 contacts the front end portion of the gear housing 103B. Thereby, the rearward movement of the hand grip 309 is restricted. This coil spring 360 is an implementation configuration example corresponding to the “biasing member” in the present invention.

  A bellows member 308 is disposed between the gear housing 103 </ b> B and the handle rear portion 350. The bellows member 308 is formed to be extendable and contractible in the long axis direction of the hammer bit 119. Thereby, relative movement of the handgrip 309 with respect to the gear housing 103B (main body housing 103) is allowed with respect to the major axis direction of the hammer bit 119. The bellows member 308 functions as a seal member that closes the gap between the main body housing 103 and the hand grip 109.

  The hammer drill 100 has a hammer drill mode and a drill mode. In the hammer drill mode, the hammer bit 119 performs a striking operation in the long axis direction and a rotating operation around the long axis direction. Thereby, a hammer drill operation is performed on the workpiece. In the drill mode, the hammer bit 119 does not perform the striking operation, but only performs the rotation operation around the major axis direction. Thereby, a drilling operation is performed on the workpiece. The hammer drill mode and the drill mode are implementation configuration examples corresponding to the “linear drive mode” and the “rotation drive mode” in the present invention, respectively.

  As shown in FIGS. 2, 3 and 6, switching between the hammer drill mode and the drill mode is performed by a mode switching mechanism 155. This mode switching mechanism 155 is mainly composed of a rotation transmission member 157 and a switching dial 159. The rotation transmitting member 157 is a substantially cylindrical member, and is movable in the axial direction of the intermediate shaft 121 with respect to the intermediate shaft 121. The rotation transmission member 157 is splined to the intermediate shaft 121 and rotates integrally with the intermediate shaft 121. Further, the rotation transmitting member 157 is formed with a first engagement portion 157a that can be engaged with the front engagement recess portion 123a of the first rotating body 123, and a second engagement portion 157b that can be engaged with the switching dial 159. ing. The first engagement portion 157a is formed as a spline groove on the inner peripheral surface of the rotation transmission member 157 that is splined with the front engagement recess portion 123a. The second engaging portion 157 b is formed as a cam groove extending in the circumferential direction of the rotation transmitting member 157 on the outer peripheral surface of the rotation transmitting member 157.

  The switching dial 159 is configured to be rotatable about an axis extending in the vertical direction of the hammer drill 100 orthogonal to the major axis direction of the hammer bit 119. The switching dial 159 has a knob portion 159 a that is manually operated by an operator, and an engaging convex portion 159 b that engages with the second engaging portion 157 b of the rotation transmitting member 157. The engaging projection 159b is formed in a conical shape centered on an axis that is offset (eccentric) from an axis that the switching dial 159 rotates. Therefore, when the knob portion 159 a is operated and the switching dial 159 is rotated, the engagement convex portion 159 b is moved in the front-rear direction of the hammer drill 100. Thereby, the rotation transmission member 157 engaged with the engagement convex part 159b is moved in the front-rear direction of the hammer drill 110. That is, the rotation transmission position 157 is moved between the front position and the rear position by the rotation of the switching dial 159. This mode switching mechanism 155 is an implementation configuration example corresponding to the “mode switching device” in the present invention.

  As shown in FIG. 2, when the rotation transmission member 157 is located at the rear position, the first engagement portion 157 a of the rotation transmission member 157 engages with the front engagement recess portion 123 a of the first rotation body 123. Accordingly, the rotation of the intermediate shaft 121 is transmitted to the first rotating body 123 via the rotation transmitting member 157. As a result, the first motion conversion mechanism 120 is driven. As a result, the striking element 140 is driven, and the hammer bit 119 is reciprocated in the long axis direction. Further, since the rotation of the intermediate shaft 121 is transmitted to the second gear 153 via the first gear 151, the tool holder 131 is rotated via the cylinder 129. Thereby, the hammer bit 119 is rotated around the major axis direction. Therefore, when the rotation transmitting member 157 is located at the rear position, a hammer drill operation is performed in which the hammer bit 119 performs the rotation operation and the striking operation as the hammer drill mode. In the hammer drill mode, the second motion conversion mechanism 220 is driven together with the first motion conversion mechanism 120.

  On the other hand, as shown in FIG. 6, when the rotation transmission member 157 is located at the front position, the first engagement portion 157a of the rotation transmission member 157 and the front engagement recess portion 123a of the first rotation body are not engaged. That is, the rotation of the intermediate shaft 121 is not transmitted to the first rotating body 123. Therefore, the first motion conversion mechanism 120 is not driven, and the hammer bit 119 is only rotated by the rotation transmission mechanism 150. That is, when the rotation transmitting member 157 is located at the front position, a drill operation is performed in which the hammer bit 119 performs only a rotation operation as the drill mode.

  The hammer drill 100 described above is driven when the electric motor 110 is energized when the trigger 309a is pulled by the operator. Thus, the machining operation is performed in the hammer mode or the hammer drill mode based on the drive mode selected by the mode switching mechanism 155. During the machining operation, vibration in the major axis direction of the hammer bit 119 is mainly generated in the main body housing 103. Since the hand grip 109 can be moved relative to the main body housing 103 in the long axis direction of the hammer bit 119, the hand grip 109 moves in the long axis direction of the hammer bit 119 in response to vibration generated during the machining operation.

  Specifically, as shown in FIGS. 1 and 10, the main body housing 103 and the hand grip 109 move relative to each other with respect to the longitudinal direction of the hammer bit 119. FIG. 1 shows a hammer drill 100 in which a hand grip 109 is positioned relatively rearward with respect to the main body housing 103. FIG. 10 shows the hammer drill 100 in which the hand grip 109 is positioned relatively forward with respect to the main body housing 103.

  As shown in FIG. 1, the hand grip 109 has a main body housing 103 formed by a rearward biasing force of a coil spring 360 (see FIGS. 7 and 8) and a contact between the contact portion 359 a and the front end portion of the gear housing 103 </ b> B. The (gear housing 103B) and the housing part 352 are arranged at a rear position separated by a distance D. That is, the bellows member 308 is held between the main body housing 103 and the housing portion 352 with a length D. At this time, since the side handle 900 is attached to the side handle mounting portion 356 that is a part of the hand grip 109, the side handle 900 is located at the rear position together with the hand grip 109.

  On the other hand, as shown in FIG. 10, the hand grip 109 is disposed at the front position against the urging force of the coil spring 360 while being urged by the coil spring 360. In this front position, the main body housing 103 (gear housing 103B) and the housing portion 352 are held at a distance D1 shorter than the distance D by the contact between the contact portion 354c and the rear end portion of the sliding guide 306. . That is, the bellows member 308 is held between the main body housing 103 and the housing portion 352 with a length D1. At this time, the side handle 900 is located at the front position together with the hand grip 109.

  As described above, the sliding guide 306 and the recess 354a are formed so as to extend in parallel with the major axis direction of the hammer bit 119. Thereby, the movement direction between the front position and the rear position of the handgrip 309 is parallel to the major axis direction of the hammer bit 119 due to the engagement of the sliding guide 306 of the motor housing 103A and the concave portion 354a of the handle rear side portion 350. Set to Further, the side handle mounting portion 356 slides with respect to the gear housing 103 </ b> B, so that the moving direction of the side handle mounting portion 356 is set parallel to the major axis direction of the hammer bit 119.

  The handgrip 109 moves relative to the main body housing 103 (motor housing 103A) via the coil spring 360 in the long axis direction of the hammer bit 119, so that vibration transmitted from the main body housing 103 to the handgrip 109 is coiled. Reduced by spring 360. That is, the kinetic energy of vibration is consumed by the deformation of the coil spring 360, and the vibration transmitted to the hand grip 109 is reduced.

  When the hammer drill mode is selected and the hammer drill 100 is driven, the second motion conversion mechanism 220 is driven. As the second swinging member 225 of the second motion conversion mechanism 220 swings, the counterweight 160 is reciprocated in the guide portion 175 in the front-rear direction of the hammer drill 100. The driving of the counterweight 160 is substantially opposite in phase to the driving of the striker 143 driven by the action of the air spring of the air chamber 127a of the piston 127. That is, when the striker 143 moves forward, the counterweight 160 moves backward, and when the striker 143 moves backward, the counterweight 160 moves forward. Thereby, the counterweight 160 suppresses the vibration in the front-rear direction generated in the main body housing 103 during the machining operation. Note that the drive of the counterweight 160 may be set substantially in reverse phase with respect to the drive of the impact bolt 145 driven by the action of the air spring of the air chamber 127a of the piston 127.

  As described above, according to the first embodiment, the hammer drill 100 includes the first anti-vibration device as the anti-vibration handle in which the hand grip 109 moves relative to the main body housing 103, and the second anti-vibration by the counterweight 160. Has a vibration device. Thereby, vibration generated during the machining operation is suppressed from being transmitted to the operator who holds the grip portion 351 of the hand grip 109. As a result, the operability of the hammer drill 100 is improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. The hammer drill 200 according to the second embodiment is different from the hammer drill 100 according to the first embodiment in the configuration of the counterweight and the guide member. Since the configuration other than the counterweight and the guide member is the same as the configuration of the hammer drill 100 of the first embodiment, the same reference numerals are given and description thereof is omitted. 11 to 14 mainly show a configuration corresponding to the gear housing 103B of the hammer drill 200 for convenience. Accordingly, illustrations of configurations corresponding to the motor housing 103A, the side grip 900, the hand grip 109, and the like are omitted. These configurations are the same as the hammer drill 100 of the first embodiment.

  As shown in FIG. 14, a counterweight 260 is rotatably connected to a distal end portion of the shaft portion 225 a of the second swing member 225 via a connecting pin 261. Therefore, the counterweight 260 is reciprocated linearly in the front-rear direction by the swing of the second swing member 225. As shown in FIGS. 12 to 14, the counterweight 260 is formed so as to surround at least a part of the first cylinder portion 271 of the cylinder holding member 270. The counterweight 260 may be formed in an annular shape so as to surround the entire circumference of the first cylinder portion 271.

  As shown in FIGS. 11 to 14, a cylinder holding member 270 is provided in the gear housing 103 </ b> B. The cylinder holding member 270 is mainly composed of a first cylinder part 271, a second cylinder part 273, guide shafts 275a and 275b, and a housing connecting part 277.

  As shown in FIG. 11, the first cylinder part 271 and the second cylinder part 273 are formed in a substantially cylindrical shape, and are arranged coaxially with the tool holder 131 and the cylinder 129. The internal space of the first cylinder part 271 is configured as a moving region of the shaft part 125 a of the first swing member 125. The second cylinder part 273 is provided in front of the first cylinder part 271 and has an outer diameter larger than the outer diameter of the first cylinder part 271. The outer peripheral portion of the second cylinder portion 273 is fixed to the gear housing 103B. Further, a bearing 274 is provided on the inner peripheral portion of the second cylinder portion 273, and the rear end region of the cylinder 129 is rotatably held via the bearing 274. The cylinder 129 and the cylinder holding member 270 are an implementation configuration example corresponding to the “cylinder” in the present invention. Further, the cylinder 129 and the first cylinder part 271 are implementation configuration examples corresponding to the “rotating cylinder part” and the “fixed cylinder part” in the present invention, respectively.

  As shown in FIGS. 12 to 14, the guide shafts 275 a and 275 b are provided in parallel to the central axis of the first cylinder 271 outside the first cylinder portion 271. The guide shafts 275a and 275b are configured as a pair of shafts respectively provided on the right side and the left side of the first cylinder portion 271 with respect to the left and right direction of the hammer drill 200 orthogonal to the major axis direction of the hammer bit 119. The guide shafts 275a and 275b are provided so as to penetrate the counterweight 260. Accordingly, the counterweight 260 slides with respect to the guide shafts 275a and 275b by the second swing member 225 and is moved in the long axis direction of the hammer bit 119 (the axial direction of the first cylinder portion 271). The guide shafts 275a and 275b are an implementation configuration example corresponding to the “guide member” in the present invention.

  As shown in FIG. 11, the housing connecting portion 277 is configured as a connecting region between the cylinder holding member 270 and the main body housing 103B. The housing connecting portion 277 is fixed to the main body housing 103B via an O-ring 277a. A bearing that supports the motor shaft 111 is attached to the housing connecting portion 277.

  Also in the second embodiment, as in the first embodiment, when the hammer drill mode is selected and the hammer drill 200 is driven, the second motion conversion mechanism 220 is driven. As the second swing member 225 of the second motion conversion mechanism 220 swings, the counterweight 260 is reciprocated in the front-rear direction of the hammer drill 100. The driving of the counterweight 260 is substantially opposite in phase to the driving of the striker 143 driven by the action of the air spring of the air chamber 127a of the piston 127. That is, when the striker 143 moves forward, the counterweight 260 moves backward, and when the striker 143 moves backward, the counterweight 260 moves forward. Thereby, the counterweight 260 suppresses the vibration in the front-rear direction generated in the main body housing 103 during the processing operation. Note that the drive of the counterweight 260 may be set substantially in reverse phase with respect to the drive of the impact bolt 145 driven by the action of the air spring of the air chamber 127a of the piston 127.

  As described above, according to the second embodiment, the hammer drill 200 includes the first anti-vibration device as the anti-vibration handle in which the handgrip 109 moves relative to the main body housing 103 and the second anti-vibration by the counterweight 260. Has a vibration device. Thereby, vibration generated during the machining operation is suppressed from being transmitted to the operator who holds the grip portion 351 of the hand grip 109. As a result, the operability of the hammer drill 200 is improved.

  In each of the embodiments described above, the driving of the counterweights 160 and 260 is set so as to be almost in phase with the driving of the striker 143 or the impact bolt 145, but is not limited thereto. Further, the phase of the first motion conversion mechanism 120 and the second motion conversion mechanism 220 is changed by changing the connection position of the first motion conversion mechanism 120 and the second motion conversion mechanism 220 with respect to the circumferential direction of the rotating shaft 121. be able to. That is, the phase of driving of striker 143 and / or impact bolt 145 and driving of counterweights 160 and 260 is appropriately set.

  Further, in each of the above embodiments, the counterweights 160 and 260 are connected so as to be moved integrally with the second swing member 225, but the present invention is not limited to this. For example, an elastic member or the like may be interposed between the second swing member 225 and the counterweights 160 and 260.

  In each of the above embodiments, the hammer drills 100 and 200 having the hammer drill mode and the drill mode have been described as the reciprocating work tools. However, the present invention is not limited to this. The present invention is applicable to a reciprocating work tool having a hammer mode in which at least the hammer bit 119 reciprocates linearly. For example, the reciprocating work tool is configured as an impact tool such as an electric hammer or an electric hammer drill.

  The reciprocating work tool is not limited to the impact tool, and the present invention can be applied to a work tool in which the tip tool reciprocates linearly. For example, the reciprocating work tool is configured as a cutting tool such as a jigsaw.

(Correspondence between each component of this embodiment and each component of the present invention)
The correspondence between each component of the present embodiment and each component of the present invention is as follows. In addition, this embodiment shows an example of the form for implementing this invention, and this invention is not limited to the structure of this embodiment.
The hammer drills 100 and 200 are an example of a configuration corresponding to the “reciprocating work tool” of the present invention.
The main body housing 103 is an example of a configuration corresponding to the “main body housing” of the present invention.
The hand grip 109 is an example of a configuration corresponding to the “handle” of the present invention.
The electric motor 110 is an example of a configuration corresponding to the “motor” of the present invention.
The first motion conversion mechanism 120 is an example of a configuration corresponding to the “drive mechanism” of the present invention.
The first swing member 125 is an example of a configuration corresponding to the “first swing member” of the present invention.
The striking element 140 is an example of a configuration corresponding to the “drive mechanism” of the present invention.
The rotation transmission mechanism 151 is an example of a configuration corresponding to the “rotation transmission mechanism” of the present invention.
The cylinder 129 is an example of a configuration corresponding to the “cylinder” of the present invention.
The cylinder 129 is an example of a configuration corresponding to the “rotating cylinder portion” of the present invention.
The mode switching mechanism 155 is an example of a configuration corresponding to the “mode switching device” of the present invention.
The counter weight 160 is an example of a configuration corresponding to the “weight” of the present invention.
The cylinder holding member 170 is an example of a configuration corresponding to the “cylinder” of the present invention.
The cylinder holding member 170 is an example of a configuration corresponding to the “fixed cylinder portion” of the present invention.
The guide portion 175 is an example of a configuration corresponding to the “guide member” of the present invention.
The second motion conversion mechanism 220 is an example of a configuration corresponding to the “weight drive mechanism” of the present invention.
The second swing member 225 is an example of a configuration corresponding to the “second swing member” of the present invention.
The counter weight 260 is an example of a configuration corresponding to the “weight” of the present invention.
The cylinder holding member 270 is an example of a configuration corresponding to the “cylinder” of the present invention.
The cylinder holding member 270 is an example of a configuration corresponding to the “fixed cylinder portion” of the present invention.
The guide shafts 275a and 275b are an example of a configuration corresponding to the “guide member” of the present invention.
The coil spring 360 is an example of a configuration corresponding to the “biasing member” of the present invention.

DESCRIPTION OF SYMBOLS 100 Hammer drill 101 Main body part 103 Main body housing 103A Motor housing 103B Gear housing 109 Hand grip 110 Electric motor 111 Motor shaft 119 Hammer bit 120 First motion conversion mechanism 121 Intermediate shaft 123 First rotating body 123a Front engagement recess 123b Rear engagement Concave portion 125 First swing member 125a Shaft portion 125b Rotating body connecting portion 127 Piston 127a Air chamber 129 Cylinder 131 Tool holder 140 Strike element 143 Strike 145 Impact bolt 150 Rotation transmission mechanism 151 First gear 153 Second gear 155 Mode switching mechanism 157 Rotation transmitting member 157a First engaging portion 157b Second engaging portion 159 Switching dial 159a Knob portion 159b Engaging convex portion 160 Counterweight 170 Cylinder holding member 171 First Cylinder portion 173 Second cylinder portion 174 Bearing 175 Guide portion 177 Housing connecting portion 177a O-ring 200 Hammer drill 220 Second motion conversion mechanism 223 Second rotating body 225 Second swing member 225a Shaft portion 225b Rotating body connecting portion 260 Counterweight 270 Cylinder holding member 271 First cylinder portion 273 Second cylinder portion 274 Bearing 275a Guide shaft 275b Guide shaft 277 Housing connecting portion 277a O-ring 306 Slide guide 308 Bellows member 350 Handle rear portion 351 Grip portion 351A1 Grip portion base end portion 351A2 Grip part front end part 352 Housing part 353 Engaging convex part 354a Concave part 354b Pressing part 354c Abutting part 355 Handle front side part 356 Side handle mounting part 357 Extending part 35 8 Engaging recess 359a Abutting portion 360 Coil spring 900 Side grip

Claims (10)

A reciprocating work tool in which a tip tool moves linearly on a predetermined axis,
A motor,
A drive mechanism that is driven by the motor and linearly moves the tip tool;
A body housing that houses the drive mechanism;
A handle connected to the main body housing so as to be relatively movable;
A biasing member that applies a biasing force between the main body housing and the handle;
A weight housed in the main body housing and movable relative to the main body housing;
A weight drive mechanism for driving the weight so as to move relative to the body housing;
A side handle mounting part to which the side handle is mounted;
Have
The drive mechanism is
A first rotating shaft driven by the motor and a first swinging member swinged by the rotation of the first rotating shaft are provided, and the tip tool is linearly moved by the swinging of the first swinging member. Configured as
The weight drive mechanism is
A second rotating shaft driven by the motor; and a second swinging member swinged by the rotation of the second rotating shaft, and the weight is attached to the main body housing by the swinging of the second swinging member. Are configured to move relative to each other,
The side handle mounting portion is configured to be relatively movable with respect to the main body housing ,
The first rotating shaft and the second rotating shaft are integrally formed coaxially,
The first rocking member has a first rotating portion that is rotated by the first rotating shaft and a first shaft portion that extends from the first rotating portion,
The second rocking member has a second rotating portion that is rotated by the second rotating shaft, and a second shaft portion that extends from the second rotating portion,
The reciprocating work tool, wherein the first rotating part and the second rotating part are connected via a cam . The reciprocating work tool according to claim 1 ,
The reciprocating work tool is characterized in that the drive of the first swing member and the drive of the second swing member are set so as to have different phases. The reciprocating work tool according to claim 1 or 2 ,
The first axis and the second axis are obtained by projecting the first axis and the second axis, respectively, onto the plane orthogonal to the predetermined axis. A reciprocating work tool characterized by being arranged at an angle. The reciprocating work tool according to any one of claims 1 to 3 ,
The reciprocating work tool is characterized in that the weight is provided so as to move linearly in parallel with the predetermined axis. The reciprocating work tool according to any one of claims 1 to 4 ,
The drive mechanism includes a piston driven by the first swing member, and a cylinder that slidably accommodates the piston,
2. The reciprocating work tool according to claim 1, wherein the weight is disposed outside the cylinder in the radial direction of the cylinder. The reciprocating work tool according to claim 5 ,
The cylinder includes a rotating cylinder portion that can rotate together with the tip tool, and a fixed cylinder portion that rotatably holds the rotating cylinder with respect to the main body housing,
A reciprocating work tool, wherein the weight is disposed outside the fixed cylinder portion. The reciprocating work tool according to claim 6 ,
The reciprocating work tool is characterized in that the weight is formed so as to surround at least a part of the fixed cylinder portion in a cross section orthogonal to the axial direction of the cylinder. The reciprocating work tool according to any one of claims 1 to 7 ,
A reciprocating work tool comprising a guide member for guiding the movement of the weight. The reciprocating work tool according to any one of claims 1 to 8 ,
The drive mechanism is
A rotation transmission mechanism for transmitting rotation of the motor to the tip tool to rotate the tip tool;
The reciprocating work tool is:
A rotational drive mode in which the tip tool is rotated;
A linear drive mode in which the tip tool is linearly driven on at least the predetermined axis, and
A mode switching device for switching between the rotational drive mode and the linear drive mode;
The mode switching device is configured to block power transmission between the first rotating shaft, the second rotating shaft, and the motor when the linear driving mode is switched to the rotational driving mode. Reciprocating work tool characterized by The reciprocating work tool according to any one of claims 1 to 9 ,
The side handle mounting portion is connected to the handle,
The urging member is configured to apply a urging force between the main body housing, the handle, and the side handle mounting portion.

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