JP2015042424A - Power tool and tip tool fixing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent relative rotation of a member which fixes a tip tool to an output shaft and a spindle against the output shaft and the spindle.SOLUTION: A fixing structure includes: a spindle 10 which is rotationally-driven; a grinding stone disk 2 which the spindle 10 passes through; a wheel washer 20 which is in the circumference of the spindle 10 and is arranged at one side of the grinding stone disk 2; a pressing plate 30 which is in the circumference of the spindle 10 and is arranged at the other side of the grinding stone disk 2; and a lock nut 50 which is screwed with the spindle 10 that passes through the pressing plate 30 and protrudes from the pressing plate 30. The spindle 10 and the wheel washer 20 are fixed to each other regarding the rotation direction of the spindle 10, the wheel washer 20 and the pressing plate 30 are fixed to each other regarding the rotation direction of the spindle 10, and the lock nut 50 presses the grinding stone disk 2 to the wheel washer 20 through the pressing plate 30.

Description

  The present invention relates to a structure for fixing a tip tool to an output shaft or a spindle included in a power tool.

  Power tools such as grinders, circular saws, and multi tools are known. These power tools, for example, rotary tools, include a spindle that is driven to rotate. Various tip tools are attached to the spindle of the rotary tool depending on the application. For example, a disc-shaped grindstone, a brush, a cutter, or the like is attached to the spindle of the grinder. The grindstone attached to the spindle of the grinder includes a grinding grindstone and a cutting grindstone. Brushes attached to the grinder spindle include wire brushes and wireless brushes. Cutters attached to the grinder spindle include diamond cutters.

  The various tip tools as described above are fixed to the spindle by a wheel washer and a lock nut. Hereinafter, a conventional example of a structure for fixing the tip tool to the spindle will be described by taking as an example the case where the tip tool is a disc-shaped grindstone (hereinafter referred to as “grinding wheel disc”). The spindle passes through the wheel washer, the grindstone disk, and the lock nut in this order. A wheel washer into which the spindle is inserted, that is, a wheel washer mounted on the spindle is fixed to the spindle in the rotation direction of the spindle. Further, a male screw is formed at the tip of the spindle that passes through the grindstone disc and protrudes from the grindstone disc, and a female screw formed on the lock nut is screwed to the male screw.

  When the lock nut is tightened, the grindstone disk sandwiched between the wheel washer and the lock nut is pressed against the wheel washer. The grindstone disk is fixed between the wheel washer and the lock nut by the pressing force of the lock nut and the reaction force thereto. As described above, the wheel washer is fixed to the spindle in the rotation direction of the spindle. That is, the wheel washer rotates integrally with the spindle. Therefore, when the spindle is driven to rotate, the grindstone disk fixed between the wheel washer and the lock nut also rotates.

JP-A-6-238557

  In the fixing structure, the screw coupling between the spindle and the lock nut may be strengthened or weakened during the rotation of the spindle. Specifically, since the tip tool and the lock nut are in direct contact with each other, the rotational torque received by the tip tool during work is transmitted to the lock nut, and the lock nut may rotate relative to the spindle. In this case, the screw connection between the spindle and the lock nut is strengthened or weakened depending on the direction of relative rotation. When the screw connection between the spindle and the lock nut is strengthened, it becomes difficult to remove the lock nut, and it becomes difficult to remove or replace the tip tool. On the other hand, when the screw connection between the spindle and the lock nut is loosened, the fixing force of the tip tool is reduced.

  An object of the present invention is to prevent relative rotation of a member for fixing a tip tool to an output shaft or spindle with respect to the output shaft or spindle.

  In one aspect of the present invention, the power tool is disposed on one side of the tip tool in the extending direction of the output shaft and the output shaft to which the tip tool is attached, and is not rotatable with respect to the output shaft. And a second member that is disposed on the other side of the tip tool in the extending direction of the output shaft and is non-rotatable with respect to the first member. The tip tool includes the first member and the second member. It is sandwiched between the second members.

  In another aspect of the present invention, a fixing member screwed to the output shaft is provided, and the first member, the tip tool, the second member, and the fixing member are arranged in this order along the extending direction of the output shaft. Are lined up.

  In another aspect of the present invention, the power tool includes an output shaft to which a tip tool is attached, a fixing member that is screwed to the output shaft to fix the tip tool, and the tip tool in the extending direction of the output shaft. A first member which is arranged on one side of the tool and cannot rotate with respect to the output shaft, and is arranged between the tip tool and the fixing member on the other side of the tip tool in the extending direction of the output shaft. And a second member that is non-rotatable with respect to the first member.

  In another aspect of the invention, the tip tool is fixed to the output shaft in contact with the first member and the second member.

  In another aspect of the present invention, the fixing structure is disposed on one side of the tip tool in the extending direction of the output shaft, and is non-rotatable with respect to the output shaft, and the extending direction of the output shaft And a second member which is disposed on the other side of the tip tool and cannot rotate with respect to the first member.

  In another aspect of the present invention, the fixing structure is arranged around the spindle and on one side of the tip tool, and on the other side of the tip tool around the spindle. An outer washer, and a lock nut threadedly coupled to the spindle that protrudes from the outer washer through the outer washer. The spindle and the inner washer are fixed to each other with respect to the rotation direction of the spindle, and the inner washer and the outer washer are fixed to each other with respect to the rotation direction of the spindle. The lock nut presses the tip tool against the inner washer through the outer washer.

  In another aspect of the present invention, a fixing structure is provided in the inner washer, the first through hole through which the spindle passes, the second through hole provided in the outer washer through which the spindle passes, and the first A first engagement surface provided around one through-hole and intersecting the rotation direction of the spindle; a second engagement surface provided around the second through-hole and intersecting the rotation direction of the spindle; The first engagement surface and the second engagement surface are opposed to each other in the rotation direction of the spindle.

  In another aspect of the present invention, the first engagement surface is an inner surface of a recess provided around the first through hole, and the second engagement surface is around the second through hole. It is the outer surface of the convex part provided and fitting to the said concave part.

  In another aspect of the present invention, the tip tool is provided with a mounting hole through which the spindle passes, and the recess is provided around the first through hole and is fitted into the mounting hole. The convex part is provided around the second through hole, and is inserted between the attachment hole and the cylindrical part.

  In another aspect of the present invention, the outer washer is provided with a locking claw that protrudes toward the lock nut and engages with a locking groove formed on an outer peripheral surface of the lock nut.

  In another aspect of the present invention, an elastic body is provided around the spindle and interposed between the lock nut and the outer washer.

  In another aspect of the present invention, the inner washer is provided with a restricting portion that comes into contact with the lock nut and restricts the screwing amount of the lock nut into the spindle.

  In another aspect of the present invention, the power tool includes a spindle that is rotationally driven, a tip tool through which the spindle passes, and an inner washer disposed around the spindle and on one side of the tip tool. An outer washer disposed around the spindle and on the other side of the tip tool, and a lock nut threadedly coupled to the spindle projecting from the outer washer through the outer washer. . The spindle and the inner washer are fixed to each other with respect to the rotation direction of the spindle, the inner washer and the outer washer are fixed to each other with respect to the rotation direction of the spindle, and the lock nut is interposed via the outer washer. The tip tool is pressed against the inner washer.

  In another aspect of the present invention, an elastic body is provided around the spindle and interposed between the lock nut and the outer washer.

  In another aspect of the present invention, the inner washer is provided with a restricting portion that comes into contact with the lock nut and restricts the screwing amount of the lock nut into the spindle.

  According to the present invention, the relative rotation of the member for fixing the tip tool to the output shaft or spindle with respect to the output shaft or spindle is reliably prevented.

It is a side view of a disk grinder. FIG. 2 is a perspective view of the disc grinder shown in FIG. 1. (A) is a side view which shows the fixation structure to the spindle of a grindstone disk, (b) is sectional drawing along the AA shown by (a). It is a disassembled perspective view which shows the fixation structure to the spindle of a grindstone disk. It is another disassembled perspective view which shows the fixation structure to the spindle of a grindstone disk. It is a decomposition | disassembly side view which shows the fixation structure to the spindle of a grindstone disk. It is sectional drawing along the BB line shown by FIG.

  Hereinafter, an example of a power tool to which the present invention is applied will be described in detail with reference to the drawings. Power tools include rotating tools such as grinders and circles and vibration tools such as multi tools. The vibration tool includes a rotating shaft that vibrates, and a tip tool is attached to the rotating shaft. Here, an example of an embodiment of the present invention will be described by taking a disc grinder as an example of a rotary tool as an example.

  A disc grinder 1 shown in FIGS. 1 and 2 includes a diamond grindstone disc (hereinafter referred to as “grindstone disc 2”) as a tip tool, and is used for grinding work for flattening the surface of concrete or stone. Used.

  The disc grinder 1 includes a main body case 3 having a substantially cylindrical shape as a whole, and the main body case 3 accommodates an electric motor as a drive source. The electric motor is connected to a commercial power source via a power supply circuit housed in the main body case 3 and a power cord 4 drawn from the rear end of the main body case 3.

  A gear case 5 is attached to the front end of the main body case 3, and a spindle (output shaft) 10 shown in FIG. 2 is rotatably supported by the gear case 5. Specifically, the spindle 10 is rotatably supported by two bearings provided in the gear case 5. The spindle 10 is orthogonal to the output shaft of the electric motor, and one end thereof extends outside the gear case 5. On the other hand, a bevel gear that meshes with a bevel gear attached to an output shaft of an electric motor is attached to the other end of the spindle 10 located in the gear case 5. The rotation of the electric motor is converted to 90 degrees by the bevel gear pair, and the rotation speed is reduced and transmitted to the spindle 10. That is, the spindle 10 is rotationally driven by the electric motor.

  The grindstone disk 2 includes a substrate 2a made of a disk-shaped steel plate, and a plurality of diamond grindstones are fixed to the surface of the substrate 2a by bonding or other means. A mounting hole into which the spindle 10 is inserted is provided at the center of the substrate 2a. The grindstone disk 2 is fixed to the spindle 10 by a fixing structure to be described later, and rotates integrally with the spindle 10. Specifically, when a switch provided in the main body case 3 is operated, electric power is supplied to the electric motor, and the output shaft of the electric motor rotates. Then, the spindle 10 connected to the output shaft via the bevel gear pair rotates, and the grindstone disk 2 fixed to the spindle 10 rotates. The gear case 5 is provided with a cover 6 that can rotate along the rotation direction of the grindstone disk 2.

  Next, a structure for fixing the grindstone disk 2 to the spindle 10 will be described. The fixing structure includes a wheel washer 20 as an inner washer, a pressing plate 30 as an outer washer, a disc spring 40 as an elastic body, and a lock nut 50 as a fixing member shown in FIG. The lock nut 50, the disc spring 40, the pressing plate 30, the grindstone disk 2, and the wheel washer 20 are arranged in this order along the extending direction of the spindle 10, and the spindle 10 passes through these members. In other words, the spindle 10 skews the wheel washer 20, the grindstone disk 2, the pressing plate 30, the disc spring 40, and the lock nut 50. That is, the wheel washer 20 and the pressing plate 30 are arranged around the spindle 10. Further, the wheel washer 20 is disposed on one side of the grindstone disk 2 in the extending direction of the spindle 10, and the pressing plate 30 is disposed on the other side of the grindstone disk 2 in the extending direction of the spindle 10. In other words, the grindstone disk 2 is sandwiched between the wheel washer 20 and the pressing plate 30. Hereinafter, each member will be specifically described. The wheel washer 20 and the pressing plate 30 correspond to the first member and the second member.

  As shown in FIGS. 4 to 7, the wheel washer 20 is formed of a steel material or the like and has a disk shape. As shown in FIGS. 4 and 5, a first through hole 21 into which the spindle 10 is inserted is provided at the center of the wheel washer 20. As shown in FIGS. 4, 6, and 7, a cylindrical portion 22 surrounding the first through hole 21 is integrally formed on the lower surface 20 a of the wheel washer 20. The cylindrical portion 22 is provided around the first through hole 21 and extends downward along the axis of the first through hole 21. Further, the outer diameter of the cylindrical portion 22 is slightly smaller than the diameter of the mounting hole 2b of the grindstone disk 2. That is, the cylindrical portion 22 can be fitted into the mounting hole 2 b of the grindstone disk 2. Furthermore, four concave portions 23 are formed on the outer peripheral surface of the cylindrical portion 22 at regular intervals (90-degree intervals) along the circumferential direction. In addition, an annular restricting portion 24 having a smaller diameter than other portions is integrally formed at the lower end of the cylindrical portion 22.

  As shown in FIGS. 4 to 7, the holding plate 30 is formed of a steel material or the like and has a disk shape. As shown in FIGS. 4 and 5, a second through hole 31 into which the spindle 10 is inserted is provided at the center of the pressing plate 30. As shown in FIGS. 5, 6, and 7, four convex portions 32 are formed at regular intervals (90 degree intervals) on the upper surface of the pressing plate 30 and around the second through holes 31. Yes. Each convex portion 32 is formed by bending a part of the holding plate 30 upward by approximately 90 degrees. Accordingly, each convex portion 32 extends upward along the axis of the second through hole 31.

  As shown in FIGS. 4, 6, and 7, four locking claws 33 are formed on the outer peripheral surface of the pressing plate 30 at regular intervals (90-degree intervals). Each locking claw 33 is formed by bending a part of the holding plate 30 downward approximately 90 degrees. That is, the locking claw 33 extends in the direction opposite to the convex portion 32. In other words, each locking claw 33 extends downward along the axis of the second through hole 31. In other words, the locking claw 33 extends toward the lock nut. As shown in FIGS. 6 and 7, the tips of the respective locking claws 33 are bent toward the inside of the pressing plate 30. That is, a hook-shaped bent portion 33 a extending in a direction intersecting the axis of the second through hole 31 is provided at the tip of each locking claw 33.

  As shown in FIGS. 4 and 5, the disc spring 40 is formed in an annular shape by a steel material or the like, and a third through hole 41 is opened at the center.

  As shown in FIGS. 4, 5, and 7, a screw hole 51 having an internal thread formed on the inner peripheral surface is provided at the center of the lock nut 50. As shown in FIGS. 5 to 7, a locking groove 52 is formed on the outer peripheral surface of the lock nut 50 over the entire periphery of the lock nut 50 so that the bent portion 33 a of the locking claw 33 extending from the pressing plate 30 is locked. Has been. Further, an annular regulating protrusion 53 surrounding the screw hole 51 is formed on the upper surface of the lock nut 50.

  Next, a procedure for attaching the wheel washer 20, the grindstone disk 2, the holding plate 30, the disc spring 40, and the lock nut 50 to the spindle 10 will be described.

  As shown in FIGS. 4 to 7, the spindle 10 is a rod having a circular cross section having a large-diameter portion 10 a and a small-diameter portion 10 b connected to the large-diameter portion 10 a. However, the two flat parts 11 are formed in the position 180 degrees different in the lower end of the outer peripheral surface of the large diameter part 10a. Moreover, the external thread is formed in the outer peripheral surface of the small diameter part 10b.

  First, the wheel washer 20 is attached to the spindle 10. That is, the spindle 10 is inserted into the first through hole 21 of the wheel washer 20. As shown in FIG. 5, two flat portions 21 a corresponding to the flat portion 11 formed on the spindle 10 are formed on the inner peripheral surface of the first through hole 21 of the wheel washer 20. When the wheel washer 20 is attached to the spindle 10, the positions of both flat portions 11 and 21a are adjusted. That is, when the wheel washer 20 is attached to the spindle 10, the flat part 21 a of the wheel washer 20 and the flat part 11 of the spindle 10 face each other. Therefore, the spindle 10 and the wheel washer 20 are fixed to each other with respect to the rotation direction of the spindle 10. In other words, the spindle 10 and the wheel washer 20 are connected so as to be relatively non-rotatable. Therefore, when the spindle 10 rotates, the wheel washer 20 rotates integrally with the spindle 10.

  Next, the grindstone disk 2 is attached to the spindle 10. That is, the cylindrical portion 22 of the wheel washer 20 and the small diameter portion 10 b of the spindle 10 protruding from the lower end of the cylindrical portion 22 are inserted into the mounting hole 2 b of the grindstone disk 2. Here, the outer diameter of the cylindrical portion 22 is substantially the same as the diameter of the mounting hole 2 b of the grindstone disk 2. Therefore, when the cylindrical portion 22 is inserted (fitted) into the mounting hole 2b, the outer peripheral surface of the cylindrical portion 22 and the inner peripheral surface of the mounting hole 2b face each other with almost no gap. However, a plurality of concave portions 23 are formed on the outer peripheral surface of the cylindrical portion 22. Therefore, a gap is created between the mounting hole 2 b and the recess 23. More specifically, a gap corresponding to the depth of the recess 23 is created between the inner peripheral surface of the mounting hole 2 b and the bottom surface of the recess 23.

  Further, the overall length of the cylindrical portion 22 is longer than the thickness of the grindstone disk 2. In other words, the overall length of the cylindrical portion 22 is longer than the overall length of the mounting hole 2b. Therefore, when the cylindrical portion 22 is inserted (fitted) into the mounting hole 2 b, the lower end of the cylindrical portion 22 protrudes below the grindstone disk 2.

  Thereafter, the holding plate 30 is attached to the spindle 10. That is, the lower end of the cylindrical portion 22 protruding from the grindstone disk 2 and the small diameter portion 10 b of the spindle 10 protruding from the lower end of the cylindrical portion 22 are inserted into the second through hole 31 of the pressing plate 30. At the same time, the convex portion 32 provided on the holding plate 30 is inserted between the mounting hole 2 b and the cylindrical portion 22. More specifically, each convex portion 32 is inserted into a gap between the inner peripheral surface of the mounting hole 2 b and the bottom surface of the concave portion 23. That is, the convex portion 32 is fitted into the concave portion 23.

  When the convex portion 32 of the pressing plate 30 is fitted into the concave portion 23 of the wheel washer 20 as described above, the outer side surface 32a of the convex portion 32 and the inner side surface 23a of the concave portion 23 shown in FIGS. Opposing in the rotation direction of the spindle 10. That is, the convex part 32 of the pressing plate 30 and the concave part 23 of the wheel washer 20 are engaged with each other. Accordingly, the holding plate 30 and the wheel washer 20 are fixed to each other with respect to the rotation direction of the spindle 10. Thus, in the present embodiment, the inner side surface 23 a of the recess 23 is a first engagement surface that intersects the rotation direction of the spindle 10. Further, the outer surface 32 a of the convex portion 32 is a second engagement surface that intersects the rotation direction of the spindle 10.

  Here, the total length of the cylindrical portion 22 formed on the wheel washer 20 is equal to or longer than the total thickness of the grindstone disk 2 and the presser plate 30. Therefore, the lower end surface of the cylindrical portion 22 inserted into the second through hole 31 of the pressing plate 30 is flush with the lower surface of the pressing plate 30 or is positioned below the lower surface of the pressing plate 30.

  Next, the disc spring 40 is attached to the spindle 10. That is, the small diameter portion 10 b of the spindle 10 protruding from the cylindrical portion 22 inserted into the second through hole 31 of the holding plate 30 is inserted into the third through hole 41 of the disc spring 40.

  Finally, the lock nut 50 is attached to the spindle 10. That is, the lock nut 50 is screwed to the small diameter portion 10 b of the spindle 10 protruding from the disc spring 40. More specifically, a male screw formed in the small diameter portion 10b of the spindle 10 and a female screw formed in the screw hole 51 of the lock nut 50 are screwed together.

  When the lock nut 50 screwed to the spindle 10 is tightened, the grindstone disk 2 is pressed against the wheel washer 20 via the disc spring 40 and the pressing plate 30. When the lock nut 50 is further tightened, the disc spring 40 interposed between the presser plate 30 and the lock nut 50 is compressed, and the grindstone disk 2 is pressed against the wheel washer 20 by the elastic restoring force of the disc spring 40.

  Here, the outer diameter of the restriction projection 53 formed on the upper surface of the lock nut 50 is smaller than the diameter of the third through hole 41 of the disc spring 40. Therefore, when the lock nut 50 is tightened, the restricting projection 53 enters the inside of the third through hole 41 of the disc spring 40. On the other hand, the lower end surface of the cylindrical portion 22 extending from the wheel washer 20 is flush with the lower surface of the pressing plate 30 or positioned below the lower surface of the pressing plate 30. Therefore, when the lock nut 50 is tightened to a predetermined position, as shown in FIG. 3B, the restricting projection 53 hits the restricting portion 24, and the tightening of the lock nut 50 is restricted. That is, the cylindrical portion 22 of the wheel washer 20 also functions as a restricting means for restricting the screwing amount of the lock nut 50 to the spindle 10. Thus, the screwing amount of the lock nut 50 to the spindle 10 is always kept constant, and the compression amount of the disc spring 40 is always kept constant. As a result, the grindstone disk 2 is always pressed against the wheel washer 20 through the pressing plate 30 with a constant force. That is, the grindstone disk 2 is always fixed between the wheel washer 20 and the pressing plate 30 by a constant pressing force and a reaction force thereto.

  As described above, the lock nut 50 does not directly contact the grindstone disk 2, but presses the grindstone disk 2 against the wheel washer 20 via the presser plate 30. Here, the holding plate 30 interposed between the grindstone disk 2 and the lock nut 50 is fixed to the wheel washer 20. Specifically, the holding plate 30 and the wheel washer 20 are fixed to each other with respect to the rotation direction of the spindle 10. Further, the wheel washer 20 and the spindle 10 to which the pressing plate 30 is fixed are fixed to each other with respect to the rotation direction of the spindle 10. Therefore, the rotational torque is not transmitted from the grindstone disk 2 to the lock nut 50, and the spindle 10 (the wheel washer 20) and the lock nut 50 do not rotate relative to each other.

  Furthermore, since the grindstone disk 2 is pressed against the wheel washer 20 by the pressing force based on the elastic restoring force of the disc spring 40, when a force that exceeds the pressing force acts on the grindstone disk 2, the grindstone disk 2 is separated from the wheel washer 20. Slide between the holding plate 30. Therefore, kickback when the grindstone disk 2 is locked can be mitigated. In other words, when the elastic restoring force of the disc spring 40 is changed, the pressing force acting on the grindstone disk 2, that is, the fixing force is changed. Here, it is obvious that the elastic restoring force of the disc spring 40 depends on the compression amount of the disc spring 40. Therefore, the fixing force of the grindstone disk 2 can be adjusted by adjusting the tightening amount of the lock nut 50. As described above, the amount of tightening of the lock nut 50 is regulated by the regulating unit 24. That is, the maximum value of the fixing force with respect to the grindstone disk 2 is always kept constant. Further, since the locking claw 33 of the press plate 30 is engaged with the lock groove 52 of the lock nut 50, when the lock nut 50 is removed from the spindle 10, the press plate 30, the disc spring 40 and the lock nut 50 are moved. It will come off integrally. Therefore, since a plurality of members do not fall apart, some members are prevented from being lost.

  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, the disc spring 40 can be replaced with another elastic body such as rubber. However, even if the disc spring 40 and other elastic bodies are omitted, the rotational torque is not transmitted from the grindstone disk 2 to the lock nut 50, and the spindle 10 and the lock nut 50 do not rotate relative to each other. That is, an embodiment in which no elastic body is interposed between the pressing plate 30 and the lock nut 50 is also included in the scope of the present invention. When the elastic body is omitted, there is no need to restrict the amount of compression of the elastic body, so the restricting portion 24 can also be omitted.

  The present invention can be applied to an electric tool using a battery pack or a commercial power source as a drive source, an air tool using air as a drive source, or an engine tool using an engine as a drive source. The present invention also includes a cutter, a circular saw, a cutting machine including a tabletop circular saw, a rotary tool configured to hold a tip tool (saw blade) between two washers, and an output shaft to which the tip tool is attached. It can be applied to a power tool such as a vibration tool that vibrates left and right around the center and polishes, peels off, and cuts the counterpart material.

DESCRIPTION OF SYMBOLS 1 Disc grinder 2 Grinding wheel disc 2a Substrate 2b Mounting hole 3 Main body case 4 Power cord 5 Gear case 6 Cover 10 Spindle 10a Large diameter part 10b Small diameter part 11 Flat part 20 Wheel washer 20a Lower surface 21 1st through-hole 22 Cylindrical part 23 Recessed part 23a Inside Side surface 24 Restriction part 30 Holding plate 31 2nd through-hole 32 Convex part 32a Outer side surface 33 Locking claw 40 Belleville spring 41 3rd through-hole 50 Lock nut 51 Screw hole 52 Locking groove 53 Control protrusion

Claims (15)

An output shaft to which a tip tool is attached;
A first member that is disposed on one side of the tip tool in the extending direction of the output shaft and is not rotatable with respect to the output shaft;
A second member disposed on the other side of the tip tool in the extending direction of the output shaft and non-rotatable with respect to the first member;
The tip tool is sandwiched between the first member and the second member;
Power tool. A fixing member screwed to the output shaft;
The first member, the tip tool, the second member, and the fixing member are arranged in this order along the extending direction of the output shaft.
The power tool according to claim 1. An output shaft to which a tip tool is attached;
A fixing member that is screwed to the output shaft to fix the tip tool;
A first member that is disposed on one side of the tip tool in the extending direction of the output shaft and is not rotatable with respect to the output shaft;
A second member that is disposed between the tip tool and the fixing member on the other side of the tip tool in the extending direction of the output shaft, and is non-rotatable with respect to the first member;
Power tool. The tip tool is fixed to the output shaft in contact with the first member and the second member,
The power tool according to claim 3. A fixing structure for attaching a tip tool to the output shaft,
A first member that is disposed on one side of the tip tool in the extending direction of the output shaft and is not rotatable with respect to the output shaft;
A second member that is disposed on the other side of the tip tool in the extending direction of the output shaft and is not rotatable with respect to the first member;
Fixed structure. A fixing structure for fixing a tip tool to a spindle included in a power tool,
An inner washer around the spindle and disposed on one side of the tip tool;
An outer washer disposed around the spindle and on the other side of the tip tool;
A lock nut threadedly coupled to the spindle that extends through the outer washer and protrudes from the outer washer;
The spindle and the inner washer are fixed to each other with respect to the rotation direction of the spindle,
The inner washer and the outer washer are fixed to each other with respect to the rotation direction of the spindle,
The lock nut presses the tip tool against the inner washer through the outer washer;
Fixed structure. A first through hole provided in the inner washer through which the spindle passes;
A second through hole provided in the outer washer through which the spindle passes;
A first engagement surface provided around the first through hole and intersecting a rotation direction of the spindle;
A second engagement surface provided around the second through hole and intersecting a rotation direction of the spindle,
The first engagement surface and the second engagement surface are opposed to each other in the rotation direction of the spindle.
The fixing structure according to claim 6. The first engagement surface is an inner surface of a recess provided around the first through hole,
The second engagement surface is an outer surface of a convex portion provided around the second through hole and fitted into the concave portion.
The fixing structure according to claim 7. The tip tool is provided with a mounting hole through which the spindle passes,
The concave portion is provided around the first through hole, and is formed on an outer peripheral surface of a cylindrical portion fitted into the mounting hole.
The convex portion is provided around the second through hole, and is inserted between the mounting hole and the cylindrical portion.
The fixing structure according to claim 8. The outer washer is provided with a locking claw that protrudes toward the lock nut and that locks in a locking groove formed on the outer peripheral surface of the lock nut.
The fixing structure according to any one of claims 6 to 9. An elastic body around the spindle and interposed between the lock nut and the outer washer;
The fixing structure according to any one of claims 6 to 10. The inner washer is provided with a restricting portion that comes into contact with the lock nut and restricts the screwing amount of the lock nut into the spindle.
The fixing structure according to claim 11. A spindle that is driven to rotate;
A tip tool through which the spindle passes;
An inner washer around the spindle and disposed on one side of the tip tool;
An outer washer disposed around the spindle and on the other side of the tip tool;
A lock nut threadedly coupled to the spindle that extends through the outer washer and protrudes from the outer washer;
The spindle and the inner washer are fixed to each other with respect to the rotation direction of the spindle,
The inner washer and the outer washer are fixed to each other with respect to the rotation direction of the spindle,
The lock nut presses the tip tool against the inner washer through the outer washer;
Power tool. An elastic body around the spindle and interposed between the lock nut and the outer washer;
The power tool according to claim 13. The inner washer is provided with a restricting portion that comes into contact with the lock nut and restricts the screwing amount of the lock nut into the spindle.
The power tool according to claim 14.

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