JP5682410B2 - Dust collection adapter and power tool with dust collection adapter - Google Patents

Description

  The present invention relates to a power tool such as a disk grinder that processes an object to be processed with a tip tool, and a dust collecting adapter that is attached to the power tool and collects dust generated during processing.

  There is a disc grinder or the like as a power tool for processing a surface of an object to be processed by rotationally driving a tip tool such as a rotating grindstone by a power source. The disc grinder is used for grinding the surface of the workpiece by rotating the tip tool with an electric motor or an air motor. As the tip tool, there are a disc-shaped grindstone, a diamond cutter, a cup-shaped grindstone, a wire brush, and the like, and an arbitrary tip tool is selected according to the type of workpiece. For example, in order to grind the surface of an object to be treated such as concrete or stone, a diamond cutter is selected as a tip tool, and the surface is ground by a power tool. A power tool that grinds the surface of an object to be processed with a tip tool is also called a disc sander or a polisher.

  Power tools that perform grinding with a tip tool such as a disc grinder or disc sander include a dust collection type equipped with a dust collection adapter so that dust generated during processing does not scatter to the outside. Patent Document 1 describes a disc sander in which a dustproof brush is attached to an opening of a dust collection cover. A dust collecting fan for taking in dust and supplying it to the hose is provided in the dust collecting cover of the power tool. A dust collection adapter is formed by a dust collection fan mounted on a spindle that drives the tip tool and a dust collection cover that covers the dust collection fan.

JP 2001-138203 A

  Power tools such as disc grinders and disc sanders include a dust collection type equipped with a dust collection cover and a general-purpose simple type without a dust collection cover. As a simple type of power tool, there is a type in which a dust collection adapter including a dust collection fan and a dustproof cover in which the dust collection fan is incorporated can be attached as an option. In the simple type, a spindle for driving a tip tool such as a grinding wheel has a length for directly attaching the tip tool. For this reason, when attaching a dust collection fan and a dust collection cover to a simple type of power tool, the length of the spindle is insufficient and it is difficult to attach the tip tool.

  Further, in order to be able to change the specification of the simple type to the dust-proof type without removing the spindle already provided in the power tool, that is, the main body spindle, it is necessary to connect the extension spindle to the tip of the main body spindle. In order to connect the extension spindle to the distal end of the main body spindle, a female screw portion that is screwed to the male screw portion of the main body spindle is provided at the base end portion of the extension spindle. In order to attach a tip tool to the tip portion of the extension spindle, a male screw portion to which a lock nut for fastening the tip tool is screwed is provided.

  When attaching / removing the tip tool for exchanging the tip tool with respect to the main body spindle, that is, when attaching / detaching the main body spindle, operate the lock button provided on the power tool main body to lock the main body spindle so that it does not rotate. I have to. Therefore, when replacing the tip tool, the operator operates the lock button with one hand to fix the main body spindle, and rotates the lock nut with the other hand to move the tip tool to the main body spindle. It is concluded to.

  However, in order to replace the tip tool attached to the extension spindle, if the lock nut that fastens the tip tool is loosened while the rotation of the main body spindle is stopped by the lock button, the lock nut will In some cases, the lock nut and the extension spindle rotate together without rotating with respect to the extension spindle, and the extension spindle loosens and disengages from the main body spindle.

  When the extension spindle is loosened and removed from the main body spindle, the extension spindle and the tip tool are in a fixed state. Therefore, the work for removing the tip tool from the extension spindle is required, and the workability of tool change is poor. is there.

  An object of the present invention is to allow a tip tool such as a grindstone wheel to be attached even if the general-purpose power tool main body has a dust collecting function, and to replace the tip tool such as a grindstone wheel with respect to the power tool main body. It is to improve.

A dust collecting adapter according to the present invention is a dust collecting adapter that collects dust generated when a workpiece is processed by a tip tool that is rotationally driven by a main body spindle of a power tool main body, and is rotationally driven by the main body spindle. A dust collecting fan; a dust collecting cover that is mounted on the power tool main body and accommodates the dust collecting fan and covers a radially outer side of the tip tool; and an extension spindle attached to the main body spindle. The spindle includes a female screw portion screwed to the male screw portion of the main body spindle at the base end portion, and a male screw portion to which a fastening member for fixing the tip tool is screwed to the distal end portion. An engagement portion that is axially movable in the attachment hole of the dust collection fan and engages in the circumferential direction is provided on the outer peripheral surface up to the tip, and the attachment hole of the dust collection fan is provided in the attachment hole. It is insertably constituting the engaging portion from the serial front end portion, the extension spindle in a state of being inserted into the mounting hole of the dust collection fan, and the female screw portion and the engaging portion of the dust collecting fan The male screw portion of the extension spindle protrudes from the dust collecting fan , being located radially inside .

In the dust collecting adapter according to the present invention, when the extension spindle rotates the fastening member with respect to the extension spindle with the tip tool detached from the main body spindle, the extension spindle is you characterized with a rotation regulating portion for regulating the rotation of the rotational direction of the fastening member to the tip portion. In the dust collecting adapter according to the present invention, the rotation restricting portion is a recess such as a hexagonal hole that opens at a tip surface of the extension spindle and engages with the attaching / detaching jig, and the attaching / detaching jig is engaged with the recessed portion. The extension spindle is restricted from rotating in the rotation direction of the fastening member. In the dust collecting adapter of the present invention, the rotation restricting portion is a protrusion such as a hexagonal protrusion that protrudes from the tip surface of the extension spindle and engages with the attaching / detaching jig. The extension spindle is restricted from rotating in the rotation direction of the fastening member.

  The power tool of the present invention is a power tool main body provided with a main body spindle for rotationally driving the tip tool, a holder provided on the power tool main body coaxially with the main body spindle, and mounted with the dust collecting cover. It has the dust collection adapter mentioned above, It is characterized by the above-mentioned.

  According to the present invention, the extension spindle is attached to the main body spindle of the power tool main body, and the extension spindle is provided with the female thread portion to which the fastening member for fixing the tip tool is screwed. A tip tool such as a grindstone wheel can be attached even if the power tool main body has a dust collecting function.

  According to the present invention, when rotating the fastening member that is screwed to the male thread portion of the extension spindle and fastens the tip tool, the attachment / detachment jig is engaged with the rotation restricting portion of the extension spindle, and the other attachment / detachment is performed on the fastening member. By engaging the jig, the fastening member can be easily rotated with respect to the extension spindle. Thereby, when attaching / detaching the fastening member to / from the extension spindle, especially when exchanging the rotary tool, the operation of removing the fastening member from the extension spindle can be easily performed, and workability at the time of tip tool exchange can be improved. .

It is a partially notched front view which shows the disc grinder as a power tool in the state which mounted | wore with the dust collecting adapter. It is a principal part expanded sectional view of FIG. It is an expanded sectional view which shows the disc grinder in the state which removed the dust collecting adapter. It is an expanded sectional view which shows the procedure which removes a dust collecting adapter from a disk grinder. It is a bottom view which shows the state which looked at two attachment jigs shown in FIG. 4 from the downward direction of FIG. It is an expanded sectional view which shows the state which removed the grindstone wheel from the extension spindle. (A) is an enlarged front view of a main body spindle, (B) is an expanded sectional view of an extension spindle. (A) is a front view of an extension spindle, (B) is a right side view of (A). (A) is a front view which shows the modification of an extension spindle, (B) is a right view of (A). (A) is a front view which shows the modification of an extension spindle, (B) is a right view of (A). (A) is a front view which shows the modification of an extension spindle, (B) is a right view of (A). (A) is a front view which shows the modification of an extension spindle, (B) is a right view of (A). (A) is a front view which shows the modification of an extension spindle, (B) is a right view of (A).

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The power tool shown in FIG. 1 is a portable or hand-held disc grinder 10. This disc grinder 10 is used to grind the surface of the object using, for example, concrete or stone, and a disc sander. It is also said.

  The disc grinder 10 has a cylindrical motor case 11a and a gear case 11b attached to the tip of the motor. The electric motor 12 is accommodated in the motor case 11a as a power source as shown in FIG. The electric motor 12 is connected to a commercial power source (not shown) via a power cord 13 drawn from the rear end of the motor case 11a, and is driven by electric power supplied from the commercial power source. A bevel gear 15 is attached to the rotating shaft 14 of the electric motor 12, and a bevel gear 16 that meshes with the bevel gear 15 is attached to a main body spindle 17 that is disposed at right angles to the rotating shaft 14, and the main body spindle 17 is rotated by the electric motor 12. Driven. The main body spindle 17 is rotatably supported by a bearing 18 attached to the gear case 11b. The bearing 18 is attached to the gear case 11b by an annular holder 19 fixed to the gear case 11b. The holder 19 is coaxial with the main body spindle 17 and is provided radially outward of the main body spindle 17.

  In the disc grinder 10, the power tool main body 10a is configured by the motor case 11a, the gear case 11b, and the above-described members incorporated therein. When the dust collecting adapter 20 is detachably attached to the power tool main body 10a, and the dust collection adapter 20 is attached to the power tool main body 10a, the disc grinder 10 becomes a dust collecting type as shown in FIG. On the other hand, when the dust collecting adapter 20 is removed from the power tool main body 10a, the disc grinder 10 becomes a simple type as shown in FIG. As shown in FIGS. 2 and 3, a male screw portion 21 is provided at the tip of the main body spindle 17. A flange portion 22 having a large diameter is provided on the base end side of the male screw portion 21, and the flange portion 22 is abutted against the bearing 18.

  When the disc grinder 10 is of a simple type, a cup-type grindstone wheel 23 as a tip tool is directly attached to the male screw portion 21 at the tip portion of the main body spindle 17. The grindstone wheel 23 has a base 24 formed in a cup shape, and a plurality of diamond grindstones 25 are fixed to the front outer periphery of the base 24 by means such as adhesion. A boss 26 is attached to the center of the base plate 24 in the radial direction. The boss 26 has a hollow shaft portion 26a penetrating the base plate 24 and an end plate portion 26b provided at the end thereof. An anti-vibration rubber sheet 27 is sandwiched between the plate portion 26 b and the base plate 24.

  The grindstone wheel 23 is attached to the main body spindle 17 by a lock nut 28 as a fastening member that is screwed or screwed to the male screw portion 21 of the main body spindle 17, and a female screw 28 a screwed to the male screw portion 21 is attached to the lock nut 28. Is provided. When the grinding wheel 23 is attached to the main body spindle 17, the end plate portion 26b of the boss 26 is abutted against the flange portion 22 of the main body spindle 17 and the main body spindle 17 is passed through the hollow shaft portion 26a. The lock nut 28 is screwed to the male screw portion 21. At this time, a lock button 29 is provided on the gear case 11b to prevent the main body spindle 17 from rotating.

  The lock button 29 is provided with a lock pin (not shown) that can reciprocate in a direction parallel to the main body spindle 17. When the lock button 29 is pushed in as shown by a two-dot chain line 29a in FIG. The bevel gear 16 is fixed by engaging with a recess (not shown) formed in 16 and the rotation of the main body spindle 17 is restricted. By rotating the lock nut 28 under this state, the lock nut 28 can be easily screwed to the male screw portion 21. Even when the lock nut 28 is loosened and removed from the male screw portion 21, the lock button 29 is pushed in to lock the main body spindle 17 to restrict its rotation.

  As shown in FIG. 2, the dust collection adapter 20 accommodates the dust collection fan 31 that is rotationally driven together with the grinding wheel 23 by the electric motor 12 and covers the outside of the grinding wheel 23 in the radial direction. And a dust collection cover 32. The dust collection fan 31 has a disk portion 31a and a plurality of blade portions 31b provided on the front side thereof. When the dust collection fan 31 rotates, air flowing in from the front side is discharged radially outward. Is done.

  The dust collecting cover 32 includes an end wall portion 33, a cylindrical peripheral wall portion 34 on the front side of the end wall portion 33, and a partition wall portion 35 that faces the end wall portion 33 through the outer peripheral portion of the dust collecting fan 31. A tool cover 36 is provided on the front side of the partition wall 35. The tool cover 36 has an inner diameter larger than the outer diameter of the grinding wheel 23 and covers the outer side in the radial direction of the grinding wheel 23. A boss portion 33a fitted to the holder 19 of the power tool main body 10a is provided in the center portion in the radial direction of the end wall portion 33, and the dust collecting cover 32 is detachably attached to the holder 19 at the portion of the boss portion 33a. Is done. A fan housing chamber 37 is formed between the end wall portion 33 and the partition wall portion 35, and the dust collecting fan 31 is incorporated in the fan housing chamber 37. A suction port 35a is formed in the partition wall portion 35. When the dust collecting fan 31 is rotated, air flows from the outside into the fan housing chamber 37 through the suction port 35a. The volute channel formed between the peripheral wall 34 and the outer periphery of the dust collecting fan 31 has a gradually increasing cross-sectional area toward the downstream side in the circumferential direction. A discharge duct 39 is provided in the dust collection cover 32 so as to communicate with the most downstream side of the volute channel 38.

  The dust collecting cover 32 is configured by combining first and second case halves 32a and 32b each formed of a resin material such as nylon. The first case half 32a is formed by integrating the end wall 33, a part of the peripheral wall 34, and a part of the discharge duct 39, and the second case half 32b is a remaining part of the peripheral wall 34. The remaining part of the discharge duct 39, the partition wall 35 and the tool cover 36 are integrated.

  As shown in FIG. 1, a hose 39a is attached to the discharge duct 39, and the discharge duct 39 is connected to a dust collection bag (not shown) by the hose 39a. Therefore, the dust generated during the grinding process by the grindstone wheel 23 enters the fan housing chamber 37 in the dust collecting cover 32 by the rotation of the dust collecting fan 31, and is guided to the dust collecting bag through the hose 39a. Thereby, the dust generated during the polishing process is removed by the dust collection bag without being scattered around the disc grinder 10.

  An annular skirt member 40 is mounted in the tool cover 36 so as to be movable in the axial direction of the main body spindle 17. A spring force is applied to the skirt member 40 in a direction protruding from the front end surface of the tool cover 36 by a spring 40a. When the grinding wheel 23 is used to polish the surface of concrete or the like, the skirt member 40 is radially outside the grinding wheel 23. Thus, it is possible to reliably prevent the dust from being blown out.

  An extension spindle 41 is attached to the boss portion 31 c of the dust collection fan 31. The base end portion 42 of the extension spindle 41 is inserted into a mounting hole 31 d formed in the boss portion 31 c of the dust collection fan 31. Two flat surfaces are formed on the inner peripheral surface of the mounting hole 31d by shifting the phase by 180 degrees. On the other hand, on the outer peripheral surface of the base end portion 42 of the extension spindle 41, as shown in FIG. 8, two flat surfaces are shifted by 180 degrees in the circumferential direction with respect to the cross-sectional shape of the mounting hole 31d. 43 is formed, and the base end portion 42 has a two-sided width structure. As shown in FIGS. 2 and 7, the base end portion 42 is formed with a female screw portion 44 that is a screw hole to be screwed to the male screw portion 21 of the main body spindle 17. The extension spindle 41 and the dust collecting fan 31 are positioned in the circumferential direction and configured to be movable in the axial direction by the flat surface 43 and the mounting hole 31d. For this reason, when attaching the dust collecting adapter 20 to the disc grinder 10, positioning in the circumferential direction is achieved simply by aligning and inserting the extension spindle 41 and the attachment hole 31 d of the dust collecting fan 31. The driving force can be transmitted to the dust collecting fan.

  A male screw portion 45 to which a female screw 28 a of the lock nut 28 is screwed is formed at the tip of the extension spindle 41. The external thread portion 21 of the main body spindle 17 and the external thread portion 45 of the extension spindle 41 have the same outer diameter and thread pitch, and the grindstone wheel 23 can be attached to the external thread portion 21 of the main body spindle 17 as shown in FIG. In addition, the grindstone wheel 23 can also be attached to the male thread portion 45 of the extension spindle 41 as shown in FIG. The grindstone wheel 23 is fastened by a lock nut 28 screwed to the male screw portions 21 and 45. As shown in FIG. 2, when the grindstone wheel 23 is attached to the main body spindle 17 through the extension spindle 41 and the dust collecting adapter 20 is attached to the power tool main body 10a, the disc grinder 10 becomes a dust collecting type. On the other hand, as shown in FIG. 3, when the grindstone wheel 23 is attached to the main body spindle 17, the disc grinder 10 becomes a simple type.

  Each of the male screw portions 21 and 45 is a right-hand screw and is a screw in the same direction. Therefore, when the grindstone wheel 23 is attached to the main body spindle 17 as shown in FIG. 3, the lock nut 28 is screwed to the male screw portion 21. At this time, the lock nut 29 is operated to rotate the lock nut 28 in the right direction when viewed from the front side, that is, from the lower side in FIG.

  In order to attach the extension spindle 41 to the main body spindle 17, the extension spindle 41 is similarly rotated rightward and screwed to the main body spindle 17 while the lock button 29 is operated to restrict the rotation of the main body spindle 17. Further, in order to attach the grindstone wheel 23 to the main body spindle 17, the boss portion of the grindstone wheel 23 is fitted to the tip end portion of the extension spindle 41 and the lock nut 28 is screwed to the male screw portion 45. Also at this time, the lock nut 28 is rotated rightward with the lock button 29 restricting the rotation of the main body spindle 17. As described above, when the dust collecting fan 31 is connected to the main body spindle 17 through the extension spindle 41 and the dust collecting cover 32 is attached to the power tool main body 10a, the disc grinder 10 becomes a dust collecting type. Thus, since the grindstone wheel 23 is attached to the main body spindle 17 via the extension spindle 41, it is possible to secure a sufficient length in the axial direction of the threaded portion necessary for attachment, so that reliable attachment can be performed. it can. Further, even if the blade 31b of the dust collecting fan 31 is formed thick, it can be sufficiently screwed, so that it is possible to increase the air volume for dust collection while realizing reliable attachment.

  When the grinding wheel 23 is removed from the disc grinder 10 to which the dust collecting adapter 20 is attached, the lock nut 28 is rotated in a loosening direction. At this time, the screw coupling between the female screw portion 44 of the extension spindle 41 and the male screw portion 21 of the main body spindle 17 may be loosened without the lock nut 28 being loosened. In addition, the operator rotates the lock nut 28 with the other hand while pressing the lock button 29 with one hand, and this operation is more than when removing the lock nut 28 from the male screw portion 21 of the main body spindle 17. Since the position of the lock button 29 and the position of the lock nut 28 are separated, it is not easy.

  For this purpose, a recess 46 that opens to the tip surface is formed as a rotation restricting portion at the tip of the extension spindle 41. The recess 46 is formed by a hexagonal hole as shown in FIG. 8, and an attachment / detachment jig 47 whose outer peripheral surface is hexagonal can be engaged with the hexagonal hole. FIG. 4 shows a state in which the attaching / detaching jig 47 is engaged with the recess 46 as the rotation restricting portion. A plurality of recesses 48 are formed on the end surface of the lock nut 28 at the same radial position from the center of rotation, and an attachment / detachment jig 49 can be engaged with the recesses 48 as shown in FIG.

  As shown in FIG. 4, the attachment / detachment jig 47 is engaged with the recess 46, and the attachment / detachment jig 49 is engaged with the recess 48. While restricting the rotation of the spindle 41, the lock nut 28 is rotated leftward by the attaching / detaching jig 49. Thereby, the lock nut 28 can be easily removed from the male thread portion 45 of the extension spindle 41 without rotating the extension spindle 41 with respect to the main body spindle 17. At this time, if the lock nut 28 rotates in the left direction relative to the extension spindle 41 in FIG. 5, the lock nut 28 can be loosened. Therefore, the attachment / detachment jig 49 is fixed and the attachment / detachment jig 47 is moved to the right. You may make it rotate, and you may make it rotate both simultaneously.

  As shown in FIG. 6, when removing the extension spindle 41 from the main body spindle 17 with the grindstone wheel 23 removed from the extension spindle 41, the lock button 29 is pushed to rotate the main body spindle 17. The extension spindle 41 is rotated in the left direction by restriction. At this time, the extension spindle 41 may be rotated to the left by the attaching / detaching jig 47, or the extension spindle 41 may be rotated to the left by holding the boss 31c of the dust collecting fan 31 in hand. good. When the extension spindle 41 is screwed to the main body spindle 17, the extension spindle 41 may be rotated to the right by the attaching / detaching jig 47, and the extension spindle 41 is moved to the right by manually holding the boss 31 c of the dust collecting fan 31. You may make it rotate in a direction.

  9 to 13 are diagrams showing modifications of the extension spindle 41, respectively. 9 is provided with one concave groove extending in the radial direction, that is, a minus groove 46a as a rotation restricting portion. At the tip of the extension spindle 41 shown in FIG. 10, two cross-shaped concave grooves, that is, plus grooves 46b are provided as rotation restricting portions. Therefore, in order to attach / detach the lock nut 28 to / from the extension spindle 41 shown in FIG. 9, a member engaging with the minus groove 46a is used as an attaching / detaching jig, and the lock nut 28 is attached to the extension spindle 41 shown in FIG. For attaching / detaching, a member engaging with the plus groove 46b is used as an attaching / detaching jig.

  The extension spindle 41 shown in FIG. 11 is provided with a hexagonal protrusion 46c as a rotation restricting portion that is discharged from the tip surface of the extension spindle 41. A rectangular protrusion 46d is provided as a rotation restricting portion protruding from the tip surface of the extension spindle 41 shown in FIG. A protrusion 46e protrudes from the tip surface of the extension spindle 41 shown in FIG. 13, and the protrusion 46e as the rotation restricting portion has a radial direction with respect to the rotation center axis of the extension spindle 41. A facing through hole 46f is provided. Therefore, in order to attach / detach the lock nut 28 to / from the extension spindle 41 shown in FIGS. 11 and 12, a spanner or the like is used as an attaching / detaching jig, and the lock nut 28 is attached to / detached from the extension spindle 41 shown in FIG. In this case, a rod that passes through the through hole 46f is used as a detachable jig.

  As described above, as the rotation restricting portion for restricting the rotation of the extension spindle 41, the attaching / detaching jig can be engaged with the extension spindle 41 as in the case where the recess, the protrusion, and the through hole are formed in the protrusion. Any form is possible as long as it is possible. Further, the shape of the lock nut 28 is not limited to the shape in which the plurality of concave portions 48 are formed on the end surface, and the lock nut 28 having a shape in which the outer peripheral surface is a square or a hexagon may be used.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, although the illustrated disc grinder 10 is an electric tool, that is, a power tool using an electric motor as a drive source, the present invention can be applied to a power tool using an air motor as a drive source. The illustrated disk grinder 10 is used for polishing the surface of the object to be processed, and the surface of the object to be processed can be roughly processed by the polishing process. On the other hand, finishing is said to be polishing, and a power tool for polishing is called a disk sander or a polisher. The power tool of the present invention can also be applied to a tool for polishing.

10 Disc grinder (power tool)
DESCRIPTION OF SYMBOLS 10a Power tool main body 11a Motor case 11b Gear case 12 Electric motor 17 Main body spindle 19 Holder 20 Dust collection adapter 21 Male thread part 22 Flange part 23 Grinding wheel (tip tool)
24 Base 25 Diamond grinding wheel 26 Boss 28 Lock nut (fastening member)
28a Female thread 29 Lock button 31 Dust collecting fan 32 Dust collecting cover 33 End wall 33a Boss 34 Peripheral wall 35 Partition wall 36 Tool cover 37 Fan housing chamber 40 Skirt member 41 Extension spindle 42 Base end 43 Flat surface 44 Female thread 45 Male thread part 46 Recessed part (Rotation restricting part)
47, 49 Removable jig

Claims (5)

A dust collecting adapter that collects dust generated when a workpiece is processed by a tip tool rotated by a main body spindle of a power tool body,
A dust collecting fan rotated by the main body spindle;
A dust collection cover that is mounted on the power tool body and houses the dust collection fan and covers a radially outer side of the tip tool;
An extension spindle attached to the main body spindle;
The extension spindle includes a female screw portion screwed to a male screw portion of the main body spindle at a base end portion, a male screw portion to which a fastening member for fixing the tip tool is screwed , and a proximal end portion. An engagement portion that is axially movable in the attachment hole of the dust collection fan and engages in the circumferential direction on the outer peripheral surface from the tip end portion to the tip end portion, and the attachment hole of the dust collection fan from the tip end side to the attachment hole. The engaging portion is configured to be insertable,
In a state in which the extension spindle is inserted into the mounting hole of the dust collection fan, and the female screw portion and the engaging portion is positioned radially inwardly of the dust collection fan, the external thread portion of the extension spindle the A dust collection adapter that protrudes from the dust collection fan.   The extension spindle rotates in the rotational direction of the fastening member when the fastening member is rotated relative to the extension spindle with the tip tool removed from the main body spindle. The dust collecting adapter according to claim 1, further comprising a rotation restricting portion that restricts the movement at a tip portion. The rotation restricting portion is a recess such as a hexagonal hole that opens at the tip surface of the extension spindle and engages with the attachment / detachment jig. The extension spindle engages the recess and the extension spindle rotates the fastening member. The dust collecting adapter according to claim 2 , wherein rotation in a direction is restricted. The rotation restricting portion is a protrusion such as a hexagonal protrusion that protrudes from the tip surface of the extension spindle and engages with an attachment / detachment jig. The extension spindle engages the protrusion and the extension spindle rotates the fastening member. The dust collecting adapter according to claim 2 , wherein the dust collecting adapter is restricted from rotating to the right. A power tool body provided with a body spindle for rotationally driving the tip tool;
A holder provided on the power tool main body coaxially with the main body spindle, and attached with the dust collecting cover;
It has a dust collecting adapter of any one of Claims 1-4 , The power tool characterized by the above-mentioned.

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