JP6397337B2 - Electric tool - Google Patents

Description

  The present invention relates to an electric tool that performs a machining operation on a workpiece.

  Japanese Patent Laying-Open No. 2006-341339 discloses an electric hammer drill. In this hammer drill, a drill mode and a hammer drill mode are set as drive modes. In the drill mode, the stop pin regulates the backward movement of the tool holder. The stop pin is configured to abut on the rod-like member, and thereby an external force caused by the retreating operation of the tool holder acts on the rod-like member.

JP 2006-341339 A

  In the hammer drill described above, the rear end portion of the rod-shaped member that comes into contact with the stop pin is a motion conversion mechanism in the inner housing that partitions the gear housing on the front side (hammer bit side) and the motor housing on the rear side (grip side). Is attached to a region behind the swing member. The front end portion of the bar-like member extends forward from the swing member. Although this rod-shaped member can receive an external force acting on the stop pin, since the rod-shaped member is configured to extend from the rear to the front of the swing member, in the region where the rod-shaped member is arranged, The arrangement of other components will be limited. In this regard, there is room for further improvement in the configuration of the load receiving portion as the rod-shaped member from the viewpoint of increasing the degree of freedom regarding the arrangement of the other component members. This invention is made in view of said subject, and provides the improvement technique regarding the structure of the load receiving part which receives the load which acts on the tool holding part which is pressed by the workpiece and can move in an electric tool. This is the issue.

  The above problems are solved by the present invention. According to the preferable form of the electric power tool according to the present invention, the electric power tool that performs a predetermined processing operation on the workpiece is configured. This electric tool mainly includes a tool holding portion, a motor, an intermediate shaft, a drive mechanism, a clutch mechanism, an urging member, a first holding member, a second holding member, and an operation member. The tool holding unit holds the tip tool and is retreated in a direction away from the workpiece together with the tip tool when the tip tool is pressed by the workpiece. The intermediate shaft is driven by a motor to drive the drive mechanism. And a drive mechanism drives a tool holding part. Typically, the drive mechanism is mainly composed of a motion conversion mechanism that converts the rotation of the intermediate shaft into a linear motion.

  The clutch mechanism includes a first clutch member and a second clutch member. This clutch mechanism is provided between the intermediate shaft and the drive mechanism. The first clutch member and the second clutch member are biased so as to be separated from each other by a biasing member. Therefore, in the clutch mechanism, the first clutch member and the second clutch member are not engaged at all times. As a result, the clutch mechanism is set in a rotation transmission cut-off state in which the rotation transmission of the intermediate shaft from the intermediate shaft to the drive mechanism is cut off. The biasing member typically uses an elastic element such as a coil spring. On the other hand, one of the first clutch member and the second clutch member is moved against the urging force of the urging member by the backward movement of the tool holding portion, so that the first clutch member and the second clutch member are moved. Engage with each other. Thereby, the clutch mechanism is set to a rotation transmission state in which the rotation of the intermediate shaft is transmitted from the intermediate shaft to the drive mechanism. Therefore, the state of the clutch mechanism can be changed between the rotation transmission interrupted state and the rotation transmission state. In addition, one clutch member (for example, 1st clutch member) may be directly connected with the tool holding part, and may be indirectly connected via the interposition member. In this case, the other clutch member (for example, the second clutch member) may be formed integrally with the drive mechanism, or may be connected to the drive mechanism via another member.

  The first holding member is configured to hold the intermediate shaft. Therefore, the first holding member is also referred to as an intermediate shaft holding member. Note that the first holding member may hold one end side of the intermediate shaft, and another member may hold the other end side of the intermediate shaft. Moreover, the 2nd holding member is comprised so that a tool holding part may be hold | maintained. Therefore, the second holding member is also referred to as a tool holding unit holding member. This 2nd holding member hold | maintains a tool holding | maintenance part so that a movement is possible. Since the tool holding unit holds the tip tool attached to the tip region of the electric tool, the second holding member is provided closer to the tip tool than the first holding member. That is, the second holding member is provided closer to the tip tool than the first holding member. Typically, the second holding member is provided closer to the tip tool than at least some of the elements constituting the drive mechanism, and is connected to the first holding member. That is, the first holding member and the second holding member are formed as separate members and are integrally connected. The operation member is configured to be movable between a permissible position that is operated by an operator to allow the tool holder to move backward and a restriction position that restricts the tool holder backward movement. The operating member may be directly engaged with the tool holding part to restrict the backward movement of the tool holding part, or may be engaged with another member connected to the tool holding part to restrict the backward movement of the tool holding part. May be. Furthermore, the second holding member receives, via the operation member, a load resulting from the retreating operation of the tool holding unit when the tip tool is pressed against the workpiece in a state where the operation member is positioned at the restriction position. Has a load receiver. That is, the load receiving portion receives a force acting on the operation member by contacting the operation member. In addition, the load resulting from the backward movement of the tool holding unit is also referred to as a pressing force.

  According to this invention, the load receiving part which receives the load which arises by the press of the tool holding part with respect to a workpiece is provided in the 2nd holding member. For this reason, the second holding member has a function of receiving the load generated by the movement of the tool holding unit as well as a function of holding the tool holding unit movably. That is, since the second holding member has a plurality of functions, the number of parts of the electric power tool is reduced. Further, since the second holding member is disposed closer to the tip tool than the first holding member, it is necessary to dispose a component functioning as a load receiving portion between the first holding member and the second holding member. There is no. That is, the load receiving portion can be reasonably arranged. Furthermore, the space between the first holding member and the second holding member is effectively used.

According to the further form of the electric tool which concerns on this invention, a drive mechanism has a peristaltic member rocked by the intermediate shaft in the axial direction of the said intermediate shaft. The second holding member is disposed closer to the tip tool than the peristaltic member.

  According to the further form of the electric tool which concerns on this invention, the operation member and the load receiving part are comprised so that a line contact or a surface contact may be carried out. Typically, the load receiving portion is configured by a plane perpendicular to the moving direction of the tool holding portion. In this case, the operation member is formed in a flat plate shape or a cylindrical shape. Suitably, a load receiving part is comprised by the recessed part formed in the 2nd holding member. According to this aspect, since the operation member and the load receiving portion are in line contact or surface contact, the load acting on the operation member can be stably received by the load receiving portion.

  According to the further form of the electric tool which concerns on this invention, the output shaft of the motor and the said intermediate shaft are arrange | positioned at the cross shape. Further, a bevel gear that transmits the rotation of the output shaft of the motor to the intermediate shaft is provided. And the 1st holding member is comprised so that the gear accommodation space which accommodates a bevel gear may be formed. That is, a 1st holding member is provided with the wall part which forms a gear accommodation space. Thereby, the bevel gear is disposed so as to be covered by the wall portion of the first holding member. Therefore, the lubricant necessary for driving the bevel gear is held in the gear housing space.

  According to the further form of the electric tool which concerns on this invention, the bevel gear is comprised as a gear assembly body previously attached to the intermediate shaft. The gear assembly is configured to be attached to the first holding member. Typically, when viewed from the axial direction of the intermediate shaft, the bevel gear has a region overlapping the second holding member. In a state where the first holding member and the second holding member are connected, it is difficult to arrange the bevel gear in the gear housing space of the first holding member. Therefore, in this embodiment, after attaching the gear assembly body in which the intermediate shaft and the bevel gear are integrated in advance to the first holding member, the second holding member is attached to the first holding member, so that the bevel gear is attached to the gear housing space. Can be reasonably arranged.

  According to the further form of the electric tool which concerns on this invention, the drive mechanism is comprised by the rocking | swiveling member rock | fluctuated in the axial direction of the said intermediate shaft by the intermediate shaft. The gear accommodating space accommodates the swing member together with the bevel gear. Typically, the swing member is configured as a drive mechanism assembly that is pre-attached to the intermediate shaft together with the bevel gear. Therefore, after the drive mechanism assembly is attached to the first holding member, the second holding member is attached to the first holding member, so that the bevel gear and the swinging member are arranged in the gear housing space.

  According to the further form of the electric tool which concerns on this invention, one clutch member of the 1st clutch member and the 2nd clutch member is connected to the tool holding | maintenance part, and the other clutch member is a drive mechanism. It is connected. The biasing member biases the tool holding portion together with the one clutch member. Furthermore, the second holding member has a biasing member receiving portion that receives the biasing member. The urging member receiving portion is constituted by, for example, a convex portion or a concave portion that can hold a coil spring as the urging member.

  According to the further form of the electric tool which concerns on this invention, an intermediate shaft is hold | maintained at a 1st holding member via a bearing. A bearing retainer for fixing the bearing to the first holding member is attached to the first holding member. The bearing retainer is typically composed of a processed metal plate (also referred to as a sheet metal member), and is fixed to the first holding member by a fixing means such as a screw. Therefore, the bearing is securely held by the bearing retainer. That is, the bearing is prevented from dropping from the first holding member.

  According to the present invention, in the electric power tool, a load receiving portion that receives a load acting on a movable tool holding portion that is pressed by a workpiece is rationally configured.

It is sectional drawing which shows the hammer drill which concerns on typical embodiment of this invention. It is sectional drawing which shows the state which the tool holder was pressed and moved back in the hammer drill of FIG. It is a side view which shows the internal mechanism of a hammer drill. It is a perspective view of a change lever and an inner housing, and shows the state where hammer drill mode is selected. It is a perspective view of a change lever and an inner housing, and shows the state where drill mode is selected. It is a perspective view of a tool holder and an inner housing assembly, and shows a state where a hammer drill mode is selected. It is a perspective view of a tool holder and an inner housing assembly, and shows a state where a drill mode is selected.

  A representative embodiment of the present invention will be described with reference to FIGS. In the present embodiment, an electric hammer drill 100 will be described as an example of an electric tool. As shown in FIG. 1, the hammer drill 100 is composed mainly of a main body 101 as a tool main body that forms the outline of the hammer drill 100. The main body 101 is mainly configured by a main body housing 103 and a gear housing 105. In the present embodiment, for convenience of explanation, with respect to the major axis direction of the hammer bit 119, the gear housing 105 side (left side in FIG. 1) is the front side of the hammer drill 100, and the hand grip 104 side (right side in FIG. 1) is the hammer drill 100. Called the back side. Further, with respect to the extending direction of the hand grip 104, the long axis (also referred to as drive axis) side of the hammer bit 119 (upper side in FIG. 1) is the upper side of the hammer drill 100, and the battery 190 side (lower side in FIG. Called the lower side.

  As shown in FIG. 1, the gear housing 105 is disposed in the tip region (left side in FIG. 1) of the main body 101. The gear housing 105 accommodates the motion conversion mechanism 120, the striking element 140, the rotation transmission mechanism 150, and the tool holder 153 that constitute the drive mechanism. A hammer bit 119 is detachably attached to the tool holder 153. The hammer bit 119 is held so as to be relatively movable in the axial direction with respect to the tool holder 153 and to rotate integrally in the circumferential direction. The tool holder 153 is formed in a substantially cylindrical shape. This tool holder 153 is an implementation configuration example corresponding to the “tool holding portion” in the present invention.

  As shown in FIG. 1, the gear housing 105 holds the inner housing 107 in a fixed shape. A rear region of the inner housing 107 is accommodated in the main body housing 103. As shown in FIGS. 3 and 4, the inner housing 107 is configured by a rear-side intermediate shaft holding part 108 and a front-side tool holder holding part 109 being fixedly connected. Further, as shown in FIG. 1, a motor housing 110 a that houses the drive motor 110 is fixedly connected below the inner housing 107 (intermediate shaft holding portion 108). A biasing spring 106 is disposed between the inner housing 107 and the main body housing 103. As a result, the gear housing 105, the inner housing 107, and the motor housing 110a are movable relative to the main body housing 103 in a state where the biasing force of the biasing spring 106 is applied. Due to the elastic deformation of the biasing spring 106, vibration generated in the gear housing 105 is suppressed from being transmitted from the gear housing 105 to the main body housing 103.

  As shown in FIG. 1, a main body housing 103 is connected to the rear of the gear housing 105. The main body housing 103 accommodates the rear region of the inner housing 107 and the motor housing 110a. The drive motor 110 is disposed so that the output shaft 111 intersects the long axis of the hammer bit 119. In the present embodiment, the drive motor 110 is arranged so that the output shaft 111 is inclined with respect to the long axis of the hammer bit 119. The drive motor 110 may be arranged so that the output shaft 111 is orthogonal to the long axis of the hammer bit 119. This drive motor 110 is an implementation structural example corresponding to the "motor" in this invention.

  The main body housing 103 is formed with a hand grip 104 that is gripped by an operator. The hand grip 104 is provided in a rear region on the opposite side of the gear housing 105 with respect to the longitudinal direction of the hammer bit 119. The hand grip 104 is formed to extend in the vertical direction intersecting the major axis direction of the hammer bit 119. The hand grip 104 is provided with a trigger 104a operated by an operator. The trigger 104 a is provided on the long axis of the hammer bit 119 in the hand grip 104. In addition, a battery mounting portion to which the battery 190 is detachably mounted is provided at a lower end portion of the hand grip 104 away from the long axis of the hammer bit 119.

  As shown in FIG. 1, the drive motor 110 is accommodated in the motor housing 110a. A first bevel gear 112 is attached to the output shaft 111 of the drive motor 110. The output shaft 111 is disposed through an output shaft through opening 108B (see FIG. 4) formed in the intermediate shaft holding portion 108 of the inner housing 107, whereby the first bevel gear 112 is disposed inside the intermediate shaft holding portion 108. . Note that the intermediate shaft holding portion holds a bearing that rotatably supports the first bevel gear 112.

  The rotational motion of the output shaft 111 is transmitted to the striking element 140 after being converted into a linear motion by the motion conversion mechanism 120. The striking element 140 driven by the motion conversion mechanism 120 strikes the hammer bit 119 and causes the hammer bit 119 to generate an impact force (striking force) in the longitudinal direction of the hammer bit 119. The rotation of the output shaft 111 of the drive motor 110 is decelerated by the rotation transmission mechanism 150 and transmitted to the tool holder 153. Thereby, the hammer bit 119 held by the tool holder 153 is rotationally driven around the long axis of the hammer bit 119. The drive motor 110 is driven by being energized by a pulling operation of a trigger 104 a disposed on the hand grip 104. The motion conversion mechanism 120, the striking element 140, and the rotation transmission mechanism 150 are an implementation configuration example corresponding to the “drive mechanism” in the present invention.

  As shown in FIG. 1, the motion conversion mechanism 120 is mainly configured by a second bevel gear 121, an intermediate shaft 123, a swing member 125, and a cylinder 130. The second bevel gear 121 is connected to the intermediate shaft 123. The second bevel gear 121 rotates by engaging with the first bevel gear 112 to rotate the intermediate shaft 123. The intermediate shaft 123 is held by the intermediate shaft holding portion 108 via a bearing 123a. A bearing retainer 108a is disposed in front of the bearing 123a. The bearing retainer 108a is attached to the intermediate shaft holding portion 108. As a result, the bearing 123a is fixed to the intermediate shaft holding portion 108. The intermediate shaft 123 is held by the gear housing 105 via a front bearing 123b. In the space surrounded by the intermediate shaft holding portion 108, a lubricant for the first bevel gear 112 and the second bevel gear 121 is disposed. As described above, the intermediate shaft holding unit 108 includes (1) a function of holding the intermediate shaft 108 to which the second bevel gear 121 is attached, (2) a function of holding the first bevel gear 112, and (3) a first bevel gear 112. And a function of holding a lubricant for the second bevel gear 121. The intermediate shaft holding portion 108 is an implementation configuration example corresponding to the “first holding member” in the present invention. Further, the intermediate shaft 123 is an implementation configuration example corresponding to the “intermediate shaft” in the present invention. The second bevel gear 121 is an implementation configuration example corresponding to the “bevel gear” in the present invention.

  A spline groove 124 is formed in the intermediate shaft 123. Further, the intermediate shaft 123 is provided with a cylindrical transmission cam 165 coaxially with the intermediate shaft 123. The transmission cam 165 is slidable in the axial direction of the intermediate shaft 123 (the longitudinal direction of the hammer drill 100). Further, the transmission cam 165 engages with the spline groove 124 and can rotate integrally with the intermediate shaft 123.

  Furthermore, a rotating body 127 of the swing member 125 is disposed on the outer peripheral portion of the intermediate shaft 123 coaxially with the intermediate shaft 123. The rotating body 127 (swing member 125) is disposed behind the transmission cam 165. The swing member 125 is mainly composed of a rotating body 127, a steel ball 128, and a swing shaft 129. A driving cam portion is provided at the rear end portion of the transmission cam 165. A driven cam portion that can be engaged with the drive cam portion is provided at the front end portion of the rotating body 127. Therefore, when the transmission cam 165 and the rotating body 127 are engaged, the rotation of the intermediate shaft 123 is transmitted to the rotating body 127 and the rotating body 127 is rotationally driven around the axis of the intermediate shaft 123. The swing shaft 129 is swung in the front-rear direction of the hammer drill 100 through the steel ball 128 by the rotation of the rotating body 124. The drive cam portion of the transmission cam 165 and the driven cam portion of the rotating body 127 are an implementation configuration example corresponding to the “clutch mechanism” in the present invention.

  A cylinder 130 that is open at the front and closed at the rear is connected to the tip (upper end) of the swing member 125. The cylinder 130 is slidably disposed inside the tool holder 153. That is, the cylinder 130 reciprocates in the front-rear direction of the hammer drill 100 as the swing member 125 moves in the front-rear direction. Thereby, the rotational motion of the drive motor 110 is converted into the linear motion of the hammer bit 119 in the major axis direction. The tool holder 153 is held by the tool holder holding portion 109 of the inner housing 107 via the bearing 155. The tool holder 153 can rotate around the axial direction of the tool holder 153 (front and rear direction of the hammer drill 100) with respect to the inner housing 107 (tool holder holding portion 109), and can move in the axial direction of the tool holder 153. It is. Therefore, the swing member 125 is disposed in the inner housing 107, and the cylinder 130 is disposed in the tool holder 153 through the tool holder through opening 109A (see FIG. 4) through which the tool holder 153 passes. The swing member 125 is an example of an implementation corresponding to the “swing member” in the present invention. Moreover, the tool holder holding | maintenance part 109 is the implementation structural example corresponding to the "2nd holding member" in this invention.

  As shown in FIG. 1, the striking element 140 is composed mainly of a striker 141 and an impact bolt 143. The striker 141 is slidably disposed in the cylinder 130. The impact port 143 is slidably disposed in the tool holder 153 and is configured as an intermediate that transmits the kinetic energy of the striker 141 to the hammer bit 119. An air chamber 130 a is formed in the cylinder 130 behind the striker 141. That is, the striker 141 is driven by the pressure fluctuation of the air chamber 130 a based on the movement of the cylinder 130 and collides with the impact bolt 143. Thereby, the impact bolt 143 collides with the hammer bit 119, and a striking force in the major axis direction of the hammer bit 119 is generated.

  As shown in FIG. 1, the rotation transmission mechanism 150 is mainly configured by a spline groove 124 formed in the intermediate shaft 123 and a driven gear 151 that engages with the spline groove 124. The driven gear 151 is connected to the tool holder 153 coaxially with the tool holder 153. Therefore, the driven gear 151 is engaged with the spline groove 124, and the driven gear 151 and the tool holder 153 are integrally rotated by the intermediate shaft 123. Thereby, the hammer bit 119 is rotationally driven around the major axis.

  The rotation transmission mechanism 150 is driven by a driven gear 151 that is always engaged with the intermediate shaft 123. Therefore, when the trigger 104a is operated and the drive motor 110 rotates, the hammer bit 119 is rotationally driven, and drilling work is possible. On the other hand, as shown in FIG. 2, the motion conversion mechanism 120 is driven when the transmission cam 165 is moved rearward and the transmission cam 165 engages with the rotating body 127. Therefore, when the motion conversion mechanism 120 is driven, the hammer bit 119 is struck by the striking element 140, and hammering work is possible. The transmission cam 165 is moved rearward by the rearward movement of the tool holder 153 that occurs when the hammer bit 119 is pressed against the workpiece.

  As described above, when the transmission cam 165 is located at the front position (position shown in FIG. 1), the driving mode is set to the drill mode in which the drilling operation is performed. On the other hand, when the transmission cam 165 is located at the rear position (position shown in FIG. 2), the hammer drill mode in which the hammer drill operation is performed is set as the drive mode. Switching between the drill mode and the hammer drill mode is performed by the drive mode switching mechanism 160.

  When the drive mode is switched to the drill mode by the drive mode switching mechanism 160, the backward movement of the tool holder 153 is restricted. Thereby, the engagement between the transmission cam 165 and the rotating body 127 is disabled, and the drive of the motion conversion mechanism 120 is restricted. Therefore, the hammer bit 119 is rotationally driven around the long axis of the hammer bit 119 by the rotation transmission mechanism 150, and drilling is performed.

  On the other hand, when the drive mode is switched to the hammer drill mode by the drive mode switching mechanism 160, the tool holder 153 is allowed to move backward. The tool holder 153 is moved backward by pressing the hammer bit 119 against the workpiece. As a result, the transmission cam 165 is moved rearward, and the transmission cam 165 and the rotating body 127 are engaged. As a result, the motion conversion mechanism 120 is driven, and a striking force in the major axis direction of the hammer bit 119 is generated by the striking element 140. Therefore, the hammer bit 119 is driven by the motion conversion mechanism 120, the striking element 140, and the rotation transmission mechanism 150, and a hammer drill operation is performed.

  Specifically, as shown in FIGS. 1 and 3 to 7, the drive mode switching mechanism 160 is mainly composed of a slide plate 161, a coil spring 163, a transmission cam 165, a change lever 167, and a stopper pin 169. .

  The slide plate 161 is arranged on the outer periphery of the tool holder 153 so as to be movable in the axial direction of the tool holder 153 (long axis direction of the hammer bit 119) with respect to the tool holder 153. Further, the tool holder 153 can rotate with respect to the slide plate 161. Two coil springs 163 are provided between the slide plate 161 and the inner housing 107 (tool holder holding portion 109). The coil spring 163 biases the slide plate 161 forward. As a result, the slide plate 161 contacts the stopper ring attached to the tool holder 153, and the coil spring 163 biases the tool holder 153. Thereby, the tool holder 153 is positioned at the front position. One end of the coil spring 163 is disposed in a concave coil spring receiving portion 109b (see FIG. 4) formed in the tool holder holding portion 109. The coil spring 163 and the coil spring receiving portion 109b are implementation examples corresponding to the “biasing member” and the “biasing member receiving portion” in the present invention, respectively.

  As shown in FIGS. 6 and 7, the slide plate 161 is further engaged with the engagement groove 166 of the transmission cam 165. That is, the two claw portions of the slide plate 161 engage with the engagement groove 166. As a result, the transmission cam 165 can rotate with respect to the slide plate 161. The transmission cam 165 is urged forward by the coil spring 163 via the slide plate 161. Thereby, as shown in FIG. 1, the transmission cam 165 is arrange | positioned in the front position (it is also called a power interruption position). That is, at the front position, the transmission cam 165 is in a non-engagement state with the rotating body 127.

  As shown in FIGS. 6 and 7, the slide plate 161 includes a pin contact portion 162 extending rearward. This pin contact portion 162 can be engaged with a stopper pin 169 operated by the change lever 167.

  As shown in FIGS. 3 to 5, the change lever 167 is provided on the side surface of the gear housing 105. The change lever 167 is supported by the gear housing 105 so as to rotate about a predetermined rotation axis extending in the left-right direction of the hammer drill 100. That is, the change lever 167 can be manually rotated by the operator between the position shown in FIG. 4 and the position shown in FIG.

  The stopper pin 169 is a long member extending in parallel with the rotation axis of the change lever 167. The stopper pin 169 is provided at a position offset from the rotation shaft of the change lever 167. The stopper pin 169 is also referred to as an eccentric pin. As the change lever 167 rotates, the stopper pin 169 switches between the position shown in FIG. 4 (position indicated by the solid line in FIG. 3) and the position shown in FIG. 5 (position indicated by the broken line in FIG. 3). It is done. This stopper pin 169 is an implementation structural example corresponding to the “operation member” in the present invention.

  As shown in FIGS. 3 and 6, when the stopper pin 169 is located at the rear position (the position indicated by the solid line in FIG. 3), the stopper pin 169 cannot be engaged with the slide plate 161. That is, the stopper pin 169 allows the slide plate 161 to move backward. Therefore, when the hammer bit 119 is pressed against the workpiece, the tool holder 153 is moved backward. As a result, the transmission cam 165 is disposed at the rear position (also referred to as a power transmission position), the transmission cam 165 and the rotating body 127 are engaged, and the motion conversion mechanism 120 is driven. That is, the position of the change lever 167 shown in FIG. 6 is set as the hammer drill mode. The position of the stopper pin 169 is also referred to as a tool holder movement allowable position.

  On the other hand, as shown in FIGS. 3 and 7, when the stopper pin 169 is located at the front position (position indicated by a broken line in FIG. 3), the stopper pin 169 can be engaged with the slide plate 161. That is, the stopper pin 169 restricts the backward movement of the slide plate 161. Therefore, even if the hammer bit 119 is pressed against the work piece, the backward movement of the slide plate 161 is restricted by the stopper pin 169, and therefore the backward movement of the tool holder 153 is restricted. As a result, the position of the transmission cam 165 located at the front position (power cutoff position) is maintained, and rotation is not transmitted to the motion conversion mechanism 120. That is, the position of the change lever 167 shown in FIG. 7 is set as the drill mode. The position of the stopper pin 169 is also referred to as a tool holder movement restriction position.

  As shown in FIGS. 5 and 7, when the drill mode is selected and the stopper pin 169 is positioned at the tool holder movement restriction position, the stopper pin 169 is formed on the tool holder holding portion 109 of the inner housing 107. The concave portion 109a is disposed. Thereby, the stopper pin 169 contacts the recess 109a. The concave portion 109a has a planar area with which the cylindrical stopper pin 169 abuts. Accordingly, the stopper pin 169 and the recess 109a (tool holder holding portion 109) are in line contact. The recess 109a is an implementation configuration example corresponding to the “load receiving portion” in the present invention. Although the stopper pin 169 is configured as a cylindrical member, the stopper pin 169 may be configured as a plate-shaped member so that the stopper pin 169 and the recess 109a are in surface contact.

  When the stopper pin 169 abuts against the slide plate 161 and restricts the rearward movement of the slide plate 161 and the tool holder 153, the force that moves the tool holder 153 backward by pressing the hammer bit 119 against the workpiece. Is received by the tool holder holding portion 109 of the inner housing 107 fixedly held by the gear housing 105 via the stopper pin 169. Thereby, the stopper pin 169 reliably suppresses the backward movement of the tool holder 153. In addition, the side wall of the recess 109a has a function of preventing further rotation (movement) of the stopper pin 169 moved by selecting the drill mode from the hammer drill mode. As described above, the tool holder holding portion 109 has (1) a function of supporting the tool holder 153, (2) a function of holding the stopper pin 169 by receiving a force acting on the stopper pin 169, and (3) a coil spring 163. Has the function of holding.

  In the present embodiment, the inner housing 107 is configured by connecting two members, an intermediate shaft holding part 108 and a tool holder holding part 109. As shown in FIG. 1, a first bevel gear 112, a second bevel gear 121, and a swing member 125 are mainly disposed in an internal space formed by the inner housing 107.

  The second bevel gear 121 attached to the intermediate shaft 123 has a size that overlaps with the tool holder holding portion 109 when viewed from the long axis direction of the hammer bit 119. In other words, the second bevel gear 121 and the tool holder holding portion 109 have an overlapping region in the vertical direction of the hammer drill 100. The relationship between the swing member 125 and the tool holder holding portion 109 is the same as the relationship between the second bevel gear 121 and the tool holder holding portion 109.

For example, in the inner housing 107 in which the intermediate shaft holding portion 108 and the tool holder holding portion 109 are integrated in advance, it is difficult to dispose the second bevel gear 121 inside the inner housing 107.
Therefore, in this embodiment, the tool holder holding part 109 is connected to the intermediate shaft holding part 108 in a state where the second bevel gear 121 and the swinging member 125 are arranged inside the intermediate shaft holding part 108, thereby A housing 107 is configured. That is, an assembly body (also referred to as a drive mechanism assembly body or a bevel gear assembly body) in which the second bevel gear 121 and the swing member 125 are coupled to the intermediate shaft 123 is assembled to the intermediate shaft holding portion 108, and then the tool holder holding portion 109. Are coupled to the intermediate shaft holding portion 108 to form an inner housing 107 (also referred to as an inner housing assembly) in which the intermediate shaft 123 and the like are assembled.

  As described above, in the configuration in which the intermediate shaft holding portion 108 and the second bevel gear 121 overlap when viewed from the long axis direction of the hammer bit 119, the second bevel gear 121 is obstructive. In addition, the pin member that receives the stopper pin 169 cannot be provided on a member disposed behind the swinging member. In this embodiment, since the stopper pin 169 is received by the tool holder holding portion 109 which is a member on the front side of the inner housing 107, the space behind the tool holder holding portion 109 can be used effectively. Therefore, it is possible to use a relatively large bevel gear.

  According to the present embodiment, since the stopper pin 169 and the recess 109a are in line contact, the load acting on the stopper pin 169 is efficiently transmitted to the recess 109a (tool holder holding portion 109). Therefore, in the drill mode, the backward movement of the tool holder 153 is stably regulated by the stopper pin 169.

  The hammer drill described above has a drill mode and a hammer drill mode, but the hammer bit 119 may further have a hammer mode in which only a striking operation is performed.

In view of the gist of the above invention, the power tool according to the present invention can be configured in the following manner.
(Aspect 1)
The drive mechanism is composed of a rotation transmission mechanism for rotating the tip tool and a striking mechanism for driving the tip tool.
The drive mode includes a drill mode in which the rotation transmission mechanism is driven and the tip tool is driven to rotate, and a hammer drill mode in which the rotation drive mechanism and the striking mechanism are driven and the tip tool is rotated and driven linearly.
When the drill mode is selected, the operation member is placed at the restriction position,
When the hammer drill mode is selected, the operation member is arranged at the allowable position.
(Aspect 2)
The load receiving portion is configured by a recess formed in the second holding member.
(Aspect 3)
The recess as the load receiving portion has a first surface perpendicular to the moving direction of the tool holding portion and a second surface intersecting the first surface,
When the operation member is moved from the allowable position to the restriction position, the movement of the operation member is restricted by being in contact with the second surface and is disposed at the restriction position.
(Aspect 4)
The first holding member and the second holding member are held in a resiliently movable manner relative to the main body housing.
(Aspect 5)
The first holding member and the second holding member are movable relative to the main body housing integrally with the motor.
(Aspect 6)
The main body housing includes a grip that is gripped by an operator.
(Aspect 7)
The load receiving portion is provided closer to the tip tool than the swing member.

(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 shown 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 drill 100 is an example of a configuration corresponding to the “power tool” of the present invention.
The drive motor 110 is an example of a configuration corresponding to the “motor” of the present invention.
The motion conversion mechanism 120 is an example of a configuration corresponding to the “drive mechanism” 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 150 is an example of a configuration corresponding to the “drive mechanism” of the present invention.
The swing member 125 is an example of a configuration corresponding to the “swing member” of the present invention.
The second bevel gear 121 is an example of a configuration corresponding to the “bevel gear” of the present invention.
The intermediate shaft 123 is an example of a configuration corresponding to the “intermediate shaft” of the present invention.
The intermediate shaft holding portion 108 is an example of a configuration corresponding to the “first holding member” of the present invention.
The tool holder holding portion 109 is an example of a configuration corresponding to the “second holding member” of the present invention.
The concave portion 109a is an example of a configuration corresponding to the “load receiving portion” of the present invention.
The coil spring receiving portion 109b is an example of a configuration corresponding to the “biasing member receiving portion” of the present invention.
The coil spring 163 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 104 Handle 104a Trigger 105 Gear housing 106 Energizing spring 107 Inner housing 108 Intermediate shaft holding part 108A Intermediate shaft through opening part 108B Output shaft through opening part 108a Bearing retainer 109 Tool holder holding part 109A Tool holder Through opening 109a Recess 109b Coil spring receiver 110 Drive motor 111 Output shaft 112 First bevel gear 119 Hammer bit 120 Motion conversion mechanism 121 Second bevel gear 123 Intermediate shaft 123a Bearing 123b Bearing 124 Spline groove 125 Oscillating member 127 Rotating body 128 Steel ball 129 Oscillating shaft 130 Cylinder 130a Air chamber 140 Stroke element 141 Strike 143 Impact bolt 150 Rotation transmission mechanism 51 driven gear 153 tool holder 155 bearing 160 driving mode switching mechanism 161 slide plate 163 coil spring 165 transmission cam 167 change lever 169 stopper pin 190 Battery

Claims (9)

An electric tool that performs a predetermined processing operation on a workpiece,
A tool holding unit that holds the tip tool and is moved backward in a direction away from the workpiece together with the tip tool when the tip tool is pressed against the workpiece;
A motor,
An intermediate shaft that is rotationally driven by the motor;
A drive mechanism driven by the intermediate shaft to drive the tool holding unit;
A clutch mechanism comprising a first clutch member and a second clutch member, and provided between the intermediate shaft and the drive mechanism;
A biasing member that biases the first clutch member and the second clutch member away from each other;
A first holding member for holding the intermediate shaft;
A second holding member that is disposed closer to the tip tool than the first holding member and holds the tool holding portion;
An operation member movable between a permissible position allowing the retraction operation of the tool holding portion and a regulation position restricting the retraction operation of the tool holding portion;
The clutch mechanism is
A rotation transmission cut-off state in which the first clutch member and the second clutch member are held in a disengaged state by a biasing force of the biasing member, and rotation transmission from the intermediate shaft to the drive mechanism is cut off; ,
One of the first clutch member and the second clutch member is moved against the urging force of the urging member and engaged with each other by the backward movement of the tool holding portion, and the intermediate shaft It is configured to be able to change between a rotation transmission state in which rotation is transmitted to the drive mechanism,
The second holding member is
A load receiving portion that receives, via the operation member, a load caused by a retreating operation of the tool holding portion when the tip tool is pressed against the workpiece in a state where the operation member is positioned at the restriction position. A power tool characterized by comprising: The electric tool according to claim 1,
The drive mechanism has a peristaltic member that is perturbed in the axial direction of the intermediate shaft by the intermediate shaft;
The electric power tool, wherein the second holding member is disposed closer to the tip tool than the sliding member. The electric tool according to claim 1 or 2 ,
The operating tool and the load receiving portion are configured to be in line contact or surface contact. The electric tool according to any one of claims 1 to 3 ,
The motor output shaft and the intermediate shaft are arranged in an intersecting manner,
A bevel gear for transmitting rotation of the output shaft of the motor to the intermediate shaft is provided;
The power tool according to claim 1, wherein the first holding member is configured to form a gear housing space for housing the bevel gear. The electric tool according to claim 4 ,
The bevel gear is configured as a gear assembly that is pre-attached to the intermediate shaft;
The power tool, wherein the gear assembly body is configured to be attached to the first holding member. The electric tool according to claim 4 or 5 ,
The power tool, wherein the bevel gear has a region overlapping with the second holding member when viewed from the axial direction of the intermediate shaft. The electric tool according to any one of claims 4 to 6 ,
The drive mechanism is composed of a swinging member that swings in the axial direction of the intermediate shaft by the intermediate shaft,
The power tool characterized in that the rocking member is housed together with the bevel gear in the gear housing space. The electric tool according to any one of claims 1 to 7 ,
One clutch member of the first clutch member and the second clutch member is connected to the tool holding portion, and the other clutch member is connected to the drive mechanism,
The biasing member is configured to bias the tool holding portion together with the one clutch member,
The electric power tool, wherein the second holding member has a biasing member receiving portion that receives the biasing member. The electric tool according to any one of claims 1 to 8 ,
The intermediate shaft is configured to be held by the first holding member via a bearing,
A power retainer for fixing the bearing to the first holding member is attached to the first holding member.

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