Power tools

Abstract

To provide a power tool which reduces variations in tip position of a driver bit when the driver bit is mounted.SOLUTION: A driver bit 3 having an annular locking groove 4 on an outer peripheral surface is detachably mounted in a power tool 10. When the driver bit 3 is inserted into an insertion hole 22 of a bit holder 18, at least three locking elements 128 which are aligned in a circumferential direction and are mutually arranged at intervals on a peripheral wall section 24 of the bit holder 18 are engaged with the annular locking groove 4. In the insertion hole 22 of the bit holder 18, a pressing member 32 which is made displaceable in a direction of a rotation axis R and a spring 34 on a rear side of the pressing member 32 are arranged. The spring 34 biases the driver bit 3 locked by each locking element 128 to a tip side through the pressing member 32 and presses the annular locking groove 4 of the driver bit 3 to each locking element 128 from a rear side.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a power tool to which a driver bit is removably attached. [Background technology]

[0002] Some driver bits that can be detachably attached to power tools such as electric screwdrivers have an annular locking groove formed on their outer circumferential surface that extends in the circumferential direction. As shown in Patent Document 1, for example, a power tool to which such a driver bit can be detachably attached includes a bit holder that defines an insertion hole into which the driver bit is inserted, a spherical locking element held in a locking element holding hole formed in the bit holder, and a sleeve disposed on the outer circumferential surface of the bit holder so as to cover the locking element from the outside. The locking element is locked into the annular locking groove of the driver bit, and is maintained in a locked state with the driver bit by being pressed radially outward by the sleeve. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 5-9863 Summary of the Invention [Problem to be solved by the invention]

[0004] The annular locking groove formed in a driver bit typically has an arc-shaped cross section with a slightly larger curvature than the spherical locking element. Therefore, when the spherical locking element is locked in the annular locking groove, the driver bit is able to move axially. Furthermore, the insertion hole typically has an inner diameter slightly larger than the outer diameter of the driver bit to allow smooth insertion of the driver bit. Therefore, when the driver bit is attached to the bit holder, the driver bit is able to move slightly radially relative to the bit holder. This axial and radial displacement of the driver bit can cause variations in the tip position of the driver bit depending on how the driver bit is attached. When a power tool is operated by hand, this variation in the tip position of the driver bit is not often a problem. However, when the power tool is mounted on an automated machine such as a robot arm, if the tip of the driver bit deviates from its set position, it may not properly fit into a component such as a screw or bolt. This will prevent proper tightening, which will result in temporary interruptions to the work process and reduced production efficiency.

[0005] SUMMARY OF THE INVENTION In view of the above problems of the prior art, an object of the present invention is to provide a power tool that can reduce variations in the tip position of a driver bit when the driver bit is attached. [Means for solving the problem]

[0006] That is, the present invention provides: A power tool to which a driver bit having an annular engaging groove extending in a circumferential direction on an outer peripheral surface thereof is removably attached, a bit holder that is driven to rotate about a rotation axis by a motor, the bit holder having a peripheral wall portion that defines an insertion hole that extends rearward from a tip opening along the rotation axis and is adapted to receive a driver bit, and a locking element holding hole that is disposed in the peripheral wall portion; a locking element disposed in the locking element holding hole, the locking element being displaceable between a locking position protruding radially inward from the inner peripheral surface of the peripheral wall portion so as to engage with the annular locking groove of the driver bit inserted into the insertion hole, and a locking release position radially outward from the locking position where the locking element is released from engagement with the annular locking groove; a sleeve disposed outside the peripheral wall portion and displaceable between a locking position that holds the locking element at the locking position and an unlocking position that allows the locking element to move to the unlocked position; a spring that biases the driver bit locked by the locking element at the locking position toward the tip end so as to press the annular locking groove of the driver bit against the locking element from behind; A power tool comprising:

[0007] In this power tool, the driver bit is biased toward the tip by a spring, pressing the annular locking groove of the driver bit against the locking element from behind. This makes it possible to prevent variation in the position of the tip of the driver bit in the direction of the rotation axis, even if the annular locking groove is large compared to the locking element.

[0008] In addition, the screwdriver may further include an O-ring attached to the inner peripheral surface of the peripheral wall portion and engaging with the outer peripheral surface of the driver bit inserted into the insertion hole to hold the driver bit aligned with the insertion hole.

[0009] By aligning the driver bit using an O-ring, the inclination of the driver bit relative to the axis of rotation can be reduced, making it possible to further suppress variation in the position of the tip of the driver bit, particularly in the radial direction.

[0010] The O-ring may be disposed in the peripheral wall at a position close to the tip opening.

[0011] Furthermore, at least three locking element holding holes and three locking elements may be arranged at equal intervals in the circumferential direction of the peripheral wall portion.

[0012] By arranging at least three locking elements at equal intervals, it is possible to align the driver bit with the insertion hole at the position where the locking elements engage, which further reduces variation in the position of the tip of the driver bit.

[0013] Also, The drive tool may further include a pressing member disposed within the insertion hole so as to be displaceable in the direction of the rotation axis, and the spring is disposed within the insertion hole behind the pressing member, so that when the driver bit is inserted into the insertion hole, the pressing member abuts against the rear end of the driver bit and the spring urges the driver bit toward the tip side via the pressing member.

[0014] moreover, a main body housing that accommodates the motor; a suction device body fixed to the body housing, the suction device body having a front end opening, a cylindrical wall portion extending rearward from the front end opening to define an internal space between the suction device body and the power tool, and a connection opening portion communicating with the internal space and adapted to be connected to an external vacuum generating source; a suction tip member that defines a bit passage extending rearward from a tip suction opening and is detachably attached to the suction device body so that a driver bit attached to the bit holder is positioned within the bit passage; Equipped with When the suction tip member is attached to the suction device body, a suction passage is defined that extends from the connection opening through the internal space and the bit passage to the tip suction opening, and the sleeve is accommodated within the suction passage; When the suction tip member is removed from the suction device body, the sleeve can be directly operated to set it to the unlocked position, allowing the driver bit to be removed from the bit holder.

[0015] Also, The suction tip member is a cylindrical member having an outer peripheral surface and an annular locking groove formed on the outer peripheral surface so as to extend in a circumferential direction, the cylindrical member being adapted to be inserted inside the cylindrical wall portion of the suction device main body; a cylindrical suction nozzle held by the cylindrical member and defining the bit passage; and The adsorption device body is a locking element holding hole formed in the cylindrical wall portion; a locking element held in the locking element holding hole, the locking element being displaceable between a locking position protruding radially inward from the inner circumferential surface of the cylindrical wall portion so as to engage with the annular locking groove of the cylindrical member inserted inside the cylindrical wall portion, and a locking release position radially outward from the locking position so as to release the engagement with the annular locking groove; a connecting sleeve disposed around the cylindrical wall portion and displaceable between a connecting position that holds the locking element of the suction device main body at the locking position and a disconnecting position that allows the locking element of the suction device main body to be displaced to the unlocking position; can have:

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power tool according to an embodiment of the present invention will now be described with reference to the accompanying drawings. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing a state in which an electric screwdriver according to a first embodiment of the present invention is mounted on a robot arm. [Figure 2] 1 is a cross-sectional view of an electric screwdriver according to a first embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] 3 is a diagram showing the electric screwdriver of FIG. 2 in a state where the driver bit can be removed. [Figure 5] FIG. 10 is a cross-sectional view of an electric screwdriver equipped with a suction device according to a second embodiment of the present invention. [Figure 6] 6 is a cross-sectional view showing the state in which the suction tip member is removed from the suction device body in the electric screwdriver of FIG. 5. FIG. [Figure 7] 6 is a cross-sectional view showing the electric screwdriver of FIG. 5 with the driver bit removed. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] As shown in Fig. 1, a power tool 10 according to a first embodiment of the present invention is an electric screwdriver 10 driven by an electric motor, and is attached to a robot arm 1 for use. In the illustrated example, the electric screwdriver 10 is attached to the tip of the robot arm 1 via a damper 2. A driver bit 3 is detachably attached to the electric screwdriver 10, as will be described later.

[0019] As shown in FIG. 2, the electric screwdriver 10 has a main housing 12 composed of a first housing 12a on the base end side and a second housing 12b on the tip end side. An electric motor 14 and a planetary gear mechanism 16 connected to the electric motor 14 are provided within the first housing 12a. A bit holder 18 is provided within the second housing 12b and is drivingly connected to the electric motor 14 via the planetary gear mechanism 16. The bit holder 18 is rotatably disposed about a rotation axis R relative to the main housing 12 and is driven to rotate about the rotation axis R by the electric motor 14. The bit holder 18 has a peripheral wall 24 that defines an insertion hole 22 extending rearward (upward as viewed in the figure) from a tip opening 20 along the rotation axis R, and a locking element holding hole 26 that radially penetrates the peripheral wall 24. The power screwdriver 10 further includes a locking element 28 held in the locking element holding hole 26 and a sleeve 30 arranged outside the peripheral wall portion 24 of the bit holder 18. The locking element holding holes 26 are aligned in the circumferential direction of the peripheral wall portion 24 and spaced apart from one another. In this embodiment, three locking element holding holes 26 and three locking elements 28 are arranged at equal intervals in the circumferential direction, as shown in FIG. 3 . A pressing member 32 is arranged within the insertion hole 22 of the bit holder 18 so as to be displaceable in the direction of the rotation axis R, and a spring 34 is arranged behind the pressing member 32 and biases the pressing member 32 toward the tip side (downward as viewed in the figure). Furthermore, an O-ring 36 is attached to the insertion hole 22 of the bit holder 18 at a position close to the tip opening 20.

[0020] The tip portion 3a of the driver bit 3 has a circular cross-sectional outer shape, but the rear portion 3b of the driver bit 3 has a hexagonal cross-sectional outer shape as shown in Fig. 3. The tip portion 22a of the insertion hole 22 also has a circular cross-sectional shape, but the rear portion 22b has a hexagonal shape corresponding to the hexagonal shape of the driver bit 3. By inserting the hexagonal rear portion 3b of the driver bit 3 into the corresponding hexagonal rear portion 22b of the insertion hole 22 in this way, the driver bit 3 is fixed in the rotational direction relative to the bit holder 18, and when the bit holder 18 is rotationally driven, the bit holder 18 also rotates together.

[0021] As shown in FIG. 2 , when the driver bit 3 is inserted into the insertion hole 22 and attached to the bit holder 18, each locking element 28 protrudes radially inward from the inner circumferential surface of the peripheral wall 24 to assume an engagement position where it is locked into the annular locking groove 4 of the driver bit 3, which has an arc-shaped cross section. The sleeve 30 assumes a locked position, holding the locking element 28 in the engagement position. This holds the driver bit 3 in the bit holder 18. At this time, the pressing member 32 abuts against the rear end of the driver bit 3, and the spring 34 biases the driver bit 3 toward the tip end via the pressing member 32. As a result, the annular locking groove 4 of the driver bit 3 is pressed against each locking element 28 from behind, and the tip end 5 of the driver bit 3 is positioned in a fixed position in the direction of the rotation axis R. Furthermore, the annular locking groove 4, which has an arc-shaped cross section, is also pressed against the three locking elements 28 in the radial direction, so that the driver bit 3 is aligned with the insertion hole 22 at the position where it engages with the locking elements 28. Furthermore, the O-ring 36 attached at a position close to the tip opening 20 engages with the outer peripheral surface 6 of the driver bit 3 in a radially compressed state, thereby aligning the driver bit 3 with the insertion hole 22 even in the locked position. By aligning the driver bit 3 at different positions using the locking element 28 and the O-ring 36 in this way, it is possible to substantially eliminate or minimize the inclination of the driver bit 3 with respect to the rotation axis R.

[0022] In this way, in the electric screwdriver 10, the driver bit 3 attached to the bit holder 18 is urged toward the tip by the spring 34, and the annular locking groove 4 of the driver bit 3 is pressed against the three locking elements 28, thereby positioning the tip 5 of the driver bit 3 at a fixed position in the direction of the rotation axis R. Furthermore, by aligning the driver bit 3 with the three locking elements 28 and the O-ring 36 on the tip side, it is possible to position the tip 5 of the driver bit 3 on the rotation axis R and reduce variation in the radial position of the tip 5 of the driver bit 3.

[0023] When removing the driver bit 3, the sleeve 30 is moved toward the tip end to the unlocked position as shown in Figure 4. Then, as shown in the figure, the locking elements 28 are displaced radially outward to the unlocked position where they are disengaged from the annular locking groove 4. In this state, the driver bit 3 can be easily removed by pulling it out of the insertion hole 22.

[0024] As shown in FIGS. 5 to 7, an electric screwdriver 110 according to a second embodiment of the present invention has a sleeve 130 that can be displaced from a locked position to an unlocked position by pushing the sleeve 130 rearward. A suction device 50 is attached to the main housing 112 of the electric screwdriver 110. The suction device 50 includes a suction device main body 54 secured to the main housing 112 with a set screw 52 and a suction tip member 56 detachably attached to the suction device main body 54. The suction device main body 54 has a cylindrical wall 60 extending rearward from a front end opening 58 (FIG. 6) and defining an internal space 59 between itself and the sleeve 130 of the electric screwdriver 110. A connection opening 62 communicates with the internal space 59 and is connected to an external vacuum source (not shown) via a tube or piping. The suction tip member 56 has a suction nozzle 68 that defines a bit passage 66 extending rearward from the tip suction opening 64, and the driver bit 3 is positioned within the bit passage 66. When the suction tip member 56 is attached to the suction device body 54, a suction flow path 69 is formed that runs from the connection opening 62 through the internal space 59 and the bit passage 66 to the tip suction opening 64. The sleeve 130 is also housed within the suction flow path 69. When a screw is fitted into the tip 5 of the driver bit 3 while air is being sucked in by an external vacuum source, the screw is sucked in and held at the tip 5 of the driver bit 3.

[0025] The suction device main body 54 further includes a locking element holding hole 70 formed in the cylindrical wall portion 60, a locking element 72 held in the locking element holding hole 70, and a connecting sleeve 74 disposed around the cylindrical wall portion 60. An L-shaped piping member 76 is attached to the cylindrical wall portion 60, and its end forms the connection opening 62. In the connected state shown in FIG. 5 , the rear end portion of the suction tip member 56 is inserted into the cylindrical wall portion 60, and the suction tip member 56 is connected to the suction device main body 54. Specifically, the locking element 72 is in an engaging position protruding radially inward from the inner circumferential surface of the cylindrical wall portion 60 so as to engage with the annular engaging groove 78 of the suction tip member 56. The connecting sleeve 74, which is in the coupled position, presses the locking element 72 from the radially outward to hold it in the engaging position, thereby maintaining the suction tip member 56 connected to the suction device main body 54.

[0026] The suction tip member 56 further includes a tubular member 80 partially inserted into the tubular wall portion 60 of the suction device main body 54; a holding member 82 that is displaceable relative to the tubular member 80 in the direction of the rotation axis R and holds the suction nozzle 68; a spring 84 that is disposed between the tubular member 80 and the holding member 82 and biases the holding member 82 toward the tip side relative to the tubular member 80; and a lock nut 86 that secures the suction nozzle 68 to the holding member 82. The annular locking groove 78 is formed on the outer circumferential surface of the tubular member 80 and extends circumferentially. An O-ring 88 is also disposed on the outer circumferential surface of the tubular member 80. In the connected state shown in FIG. 5 , the O-ring 88 is compressed between the tubular member 80 of the suction tip member 56 and the tubular wall portion 60 of the suction device main body 54, sealing the gap therebetween.

[0027] A female thread 90 is formed on the inner peripheral surface of the holding member 82, and a male thread 92 is formed on the outer peripheral surface of the suction nozzle 68. The suction nozzle 68 is attached to the holding member 82 by threading the male thread 92 onto the female thread 90. A lock nut 86 is threaded onto the male thread 92 of the suction nozzle 68, and the suction nozzle 68 is fixed to the holding member 82 by tightening the lock nut 86. When the lock nut 86 is loosened, the suction nozzle 68 can be rotated relative to the holding member 82 to change its position relative to the holding member 82. This allows the position of the tip suction opening 64 of the suction nozzle 68 to be adjusted to match the attached driver bit 3. Furthermore, because the suction nozzle 68 is held displaceably relative to the tubular member 80 via the holding member 82, when the tip of the suction nozzle 68 is pressed, for example, when the tip of the suction nozzle 68 hits a member into which a screw is to be threaded during a screwdriver operation, the suction nozzle 68 can retract together with the holding member 82 while compressing the spring 84. This prevents the suction nozzle 68 from interfering with the member into which the screw is to be fastened during the screw fastening operation, preventing proper screw fastening.

[0028] As shown in Figure 6, when the connecting sleeve 74 is displaced rearward to the disconnected position, the locking element 72 is no longer supported from the radially outward direction by the connecting sleeve 74 and is allowed to move radially outward. In this state, when the suction tip member 56 is pulled toward the tip, the locking element 72 moves radially outward from the locked position to the unlocked position where it is disengaged from the annular locking groove 78. This allows the suction tip member 56 to be removed from the suction device main body 54. Once the suction tip member 56 is removed, the sleeve 130 can be directly accessed from the front end opening 58 of the suction device main body 54.

[0029] As shown in FIG. 7 , when the sleeve 130 is directly operated to move it rearward to the unlocked position, the locking element 128 is displaced radially outward from the locked position to the unlocked position, where it disengages from the annular locking groove 4 of the driver bit 3. In this state, the driver bit 3 can be removed by pulling it out of the insertion hole 122 of the bit holder 118. In this embodiment, the driver bit 3 is biased toward the tip by the spring 134 via the pressing member 132. Therefore, when the sleeve 130 is set to the unlocked position, the driver bit 3 is pushed out of the bit holder 118 by the biasing force of the spring 134. Furthermore, when the driver bit 3 is removed, the pressing member 132 is positioned radially inward of the locking element 128, holding the locking element 128 in the unlocked position. This holds the sleeve 130 in the unlocked position. To reinstall the driver bit 3, the driver bit 3 is inserted into the bit holder 118. Then, the pressing member 132 is pushed back by the driver bit 3, and when the annular locking groove 4 of the driver bit 3 is positioned so as to align with the locking element 128, the locking element 128 is pushed by the sleeve 130 to the locking position. At this time, the sleeve 130 is also pushed by the spring 138 to the locked position. This results in the state shown in Figure 6 in which the driver bit 3 is attached.

[0030] In this way, in the electric screwdriver 110 equipped with the suction device 50, the driver bit 3 can be removed without removing the suction device main body 54, which is connected to an external vacuum source by a tube or the like, from the main body housing 112, making it easy to replace the driver bit 3. It also makes it easy to adjust the position of the suction nozzle 68 of the suction tip member 56 to match the replaced driver bit 3, or to replace the suction tip member 56.

[0031] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, four or more locking element holding holes and locking elements for holding driver bits may be arranged. Furthermore, when the driver bit is attached to the bit holder, the spring biases the driver bit via a pressing member, but the spring may also bias the driver bit directly. Furthermore, the power tool of the present invention is not limited to an electric screwdriver, and may be, for example, an air screwdriver using an air motor instead of an electric motor. The suction device of the second embodiment can be used in the electric screwdriver of the first embodiment, and the cylindrical wall portion of the suction device main body can be formed integrally with the main body housing. [Explanation of symbols]

[0032] 1. Robotic Arm 2 dampers 3 driver bits 3a Tip side part 3b Rear part 4 Annular locking groove 5 Tip 6 Outer surface 10 Electric screwdriver (power tool) 12 Main body housing 12a 1st Housing 12b Second Housing 14 Electric motor 16 Planetary gear mechanism 18 Bit Holder 20 Tip opening 22 Insertion hole 22a Tip side part 22b rear part 24 Peripheral wall section 26 Lock element holding hole 28 Locker 30 sleeves 32 Pressing member 34 Spring 36 O-ring 50 Adsorption device 52 Set screw 54 Adsorption device body 56 Adsorption tip member 58 Front end opening 59 Interior Space 60 Cylindrical wall 62 Connection opening 64 Tip suction opening 66-bit passage 68 Suction nozzle 69 Suction channel 70 Lock retaining hole 72 Locker 74 Connecting sleeve 76 Piping components 78 Annular locking groove 80 Cylindrical member 82 Retaining member 84 Spring 86 Lock nut 88 O-ring 90 Female thread 92 Male thread 110 Electric screwdriver (power tool) 112 Main body housing 118 Bit Holder 122 Insertion hole 128 Locker 130 sleeve 132 Pressing member 134 Spring 138 Spring R rotation axis

Claims

1. A power tool to which a driver bit having an annular engaging groove extending in a circumferential direction on an outer peripheral surface thereof is removably attached, a bit holder that is driven to rotate about a rotation axis by a motor, the bit holder having a peripheral wall portion that defines an insertion hole that extends rearward from a tip opening along the rotation axis and is adapted to receive a driver bit, and a locking element holding hole that is disposed in the peripheral wall portion; a locking element disposed in the locking element holding hole, the locking element being displaceable between a locking position protruding radially inward from the inner peripheral surface of the peripheral wall portion so as to engage with the annular locking groove of the driver bit inserted into the insertion hole, and a locking release position radially outward from the locking position where the locking element is released from engagement with the annular locking groove; a sleeve disposed outside the peripheral wall portion and displaceable between a locking position that holds the locking element at the locking position and an unlocking position that allows the locking element to move to the unlocked position; a spring that biases the driver bit locked by the locking element at the locking position toward the tip end so as to press the annular locking groove of the driver bit against the locking element from behind; an O-ring attached to the inner peripheral surface of the peripheral wall portion and engaging with the outer peripheral surface of the driver bit inserted into the insertion hole to align and hold the driver bit with respect to the insertion hole; A power tool comprising:

2. The power tool of claim 1 , wherein the O-ring is disposed in the peripheral wall portion adjacent the distal end opening.

3. 3. The power tool according to claim 1, wherein at least three of the locking element holding holes and the locking elements are arranged at equal intervals in a circumferential direction of the peripheral wall portion.

4. 4. The power tool according to claim 1, further comprising a pressing member disposed in the insertion hole so as to be displaceable in the direction of the rotation axis, the spring being disposed in the insertion hole behind the pressing member, so that when the driver bit is inserted into the insertion hole, the pressing member abuts against a rear end of the driver bit and the spring urges the driver bit toward a tip end via the pressing member.

5. a main body housing that accommodates the motor; a suction device body fixed to the body housing, the suction device body having a front end opening, a cylindrical wall portion extending rearward from the front end opening to define an internal space between the suction device body and the power tool, and a connection opening portion communicating with the internal space and adapted to be connected to an external vacuum generating source; a suction tip member that defines a bit passage extending rearward from a tip suction opening and is detachably attached to the suction device body so that a driver bit attached to the bit holder is positioned within the bit passage; Equipped with When the suction tip member is attached to the suction device body, a suction passage is defined that extends from the connection opening through the internal space and the bit passage to the tip suction opening, and the sleeve is accommodated within the suction passage; 5. The power tool according to claim 1, wherein when the suction tip member is removed from the suction device body, the sleeve can be directly operated to set it to the unlocked position, allowing the driver bit to be removed from the bit holder.

6. The suction tip member is a cylindrical member having an outer peripheral surface and an annular locking groove formed on the outer peripheral surface so as to extend in a circumferential direction, the cylindrical member being adapted to be inserted inside the cylindrical wall portion of the suction device main body; a cylindrical suction nozzle held by the cylindrical member and defining the bit passage; and The adsorption device body is a locking element holding hole formed in the cylindrical wall portion; a locking element held in the locking element holding hole, the locking element being displaceable between a locking position protruding radially inward from the inner circumferential surface of the cylindrical wall portion so as to engage with the annular locking groove of the cylindrical member inserted inside the cylindrical wall portion, and a locking release position radially outward from the locking position so as to release the engagement with the annular locking groove; a connecting sleeve disposed around the cylindrical wall portion and displaceable between a connecting position that holds the locking element of the suction device main body at the locking position and a disconnecting position that allows the locking element of the suction device main body to be displaced to the unlocking position; The power tool of claim 5 , wherein

7. A power tool in which a driver bit having an annular locking groove extending in the circumferential direction on its outer peripheral surface can be detachably attached, a bit holder that is driven to rotate about a rotation axis by a motor, the bit holder having a peripheral wall portion that defines an insertion hole that extends rearward from a tip opening along the rotation axis and is adapted to receive a driver bit, and a locking element holding hole that is disposed in the peripheral wall portion; a locking element disposed in the locking element holding hole, the locking element being displaceable between a locking position protruding radially inward from the inner peripheral surface of the peripheral wall portion so as to engage with the annular locking groove of the driver bit inserted into the insertion hole, and a locking release position radially outward from the locking position where the locking element is released from engagement with the annular locking groove; a sleeve disposed outside the peripheral wall portion and displaceable between a locking position that holds the locking element at the locking position and an unlocking position that allows the locking element to move to the unlocked position; a spring that biases the driver bit locked by the locking element at the locking position toward the tip end so as to press the annular locking groove of the driver bit against the locking element from behind; a main body housing that accommodates the motor; a suction device body fixed to the body housing, the suction device body having a front end opening, a cylindrical wall portion extending rearward from the front end opening to define an internal space between the suction device body and the power tool, and a connection opening portion communicating with the internal space and adapted to be connected to an external vacuum generating source; a suction tip member that defines a bit passage extending rearward from a tip suction opening and is detachably attached to the suction device body so that a driver bit attached to the bit holder is positioned within the bit passage; Equipped with The suction tip member is a cylindrical member having an outer peripheral surface and an annular locking groove formed on the outer peripheral surface so as to extend in a circumferential direction, the cylindrical member being adapted to be inserted inside the cylindrical wall portion of the suction device main body; a cylindrical suction nozzle held by the cylindrical member and defining the bit passage; and The adsorption device body is a locking element holding hole formed in the cylindrical wall portion; a locking element held in the locking element holding hole, the locking element being displaceable between a locking position protruding radially inward from the inner circumferential surface of the cylindrical wall portion so as to engage with the annular locking groove of the cylindrical member inserted inside the cylindrical wall portion, and a locking release position radially outward from the locking position so as to release the engagement with the annular locking groove; a connecting sleeve disposed around the cylindrical wall portion and displaceable between a connecting position that holds the locking element of the suction device main body at the locking position and a disconnecting position that allows the locking element of the suction device main body to be displaced to the unlocking position; and When the suction device is attached to the suction device body, a suction passage is defined that extends from the connection opening through the internal space and the bit passage to the tip suction opening, and the sleeve is accommodated within the suction passage. When the suction tip member is removed from the suction device body, the sleeve can be directly operated to set it to the unlocked position, and the driver bit can be removed from the bit holder. Power tools.

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