JP3062177B2 - Attachment for rotating work tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an attachment for a rotary work tool.

[0002]

2. Description of the Related Art Conventionally, in a maintenance shop or a repair shop of an automobile, for example, an air ratchet wrench that is driven to rotate by air pressure has been used in operations such as mounting and removing various parts.

[0003]

However, since the above-described air ratchet wrench is generally thick from the gripping portion to the tip end having the output shaft, for example, fender replacement in sheet metal work, bumper replacement, door lining parts, etc. It could not be used in narrow places such as exchange. Further, as the engine of an automobile has become more sophisticated, complicated mechanisms have become denser, and the above-described air ratchet wrench cannot be used for maintenance of electrical components around the engine.

Therefore, the present invention solves the above-mentioned problem,
An object of the present invention is to provide an attachment for a rotary working tool that can easily and efficiently perform a rotating operation even when a bolt or a nut is in a narrow place.

[0005]

In order to achieve the above object, an attachment for a rotary work tool according to the present invention includes an input gear that is connected to and removably connected to an output shaft of the rotary work tool; A torque transmission gear and an output gear having a non-circular hole at the center are respectively arranged in a substantially flat elongated rectangular or substantially elongated circular casing so as to sequentially mesh from a base end to a distal end. And the base end of the casing
At the same time, projecting to one side parallel to the longitudinal direction of the casing.
A pair of rotations that bend at the time of excessive torque input
A work tool support piece is provided .

Further, the casing has an input window and an output window, and has a pair of side plates forming both side surfaces. The casing is disposed between the pair of side plates, and the input gear and the torque transmission. A gear and an intermediate plate having a bead-shaped window portion in which the output gear is rotatably housed are formed by being connected in a laminated manner , and at the base end of the casing,
Parallel to the longitudinal direction of the casing and project to one side
And a pair of rotating operations that bend when excessive torque is input
A tool support piece is provided.

[0007] In its pair of rotating the implement support pieces are adjustable configuration mutual spacing dimension.

Alternatively, a circumferential groove is provided on the inner surface of the non-circular hole of the output gear, and a C groove is formed in the circumferential groove.
The elastic ring body is fitted into the non-circular hole, and the outer peripheral surface of the non-circular hole has a locking groove for engaging and disengaging the elastic ring. A cylindrical member having a small non-circular hole is detachably inserted and replaced.

A locking groove provided on the outer peripheral surface of the cylindrical member has a first groove wall formed in a direction perpendicular to the axis of the cylindrical member, and an inner end of the first groove wall. , And a second groove wall formed in a direction inclined outwardly with respect to the axis, wherein a cross-sectional shape of the locking groove portion in the radial direction is the first groove wall, the second groove wall, A straight line connecting the outer end of the first groove wall and the outer end of the second groove wall forms a substantially right triangle.

[0010] Alternatively, the locking groove provided on the outer peripheral surface of the cylindrical member may be formed by two groove walls formed at equal inclination angles outwardly in opposite directions with respect to the axis of the cylindrical member. The length of the two groove walls and the length of a straight line connecting the outer ends of the two groove walls are set to be equal to each other, and the longitudinal cross-sectional shape of the locking groove portion is formed in a substantially equilateral triangular shape. .

Further, the locking groove portion provided on the outer peripheral surface of the cylindrical member is formed by two groove walls formed at different inclination angles outwardly in opposite directions with respect to the axis of the cylindrical member. It may be constituted so that it becomes.

Alternatively, the shape of the C-shaped elastic ring in a free state is a perfect circle, an ellipse, or an egg-shaped circle.

[0013] Further, locking grooves provided on the outer peripheral surface of the cylindrical member are set at different distances from the end surface of the cylindrical member, respectively, and the protruding length of the cylindrical member from the output window of the casing. Is configured to be able to be set variably.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing embodiments.

First, the rotary working tool will be described. As shown in FIG. 9, a rotary working tool A is provided with a grip 46 provided with a swinging operation lever 45 and a projecting shape protruding toward the distal end of the grip 46. An extended portion 47 provided, and an output shaft 48 provided in a laterally outwardly projecting shape at a tip end portion of the extended portion 47, and an output shaft using compressed air supplied through a lead hose 49 as a driving force. 48 is driven to rotate. As such a rotary working tool A, an air ratchet wrench can be used.

FIGS. 1 and 2 show an embodiment of the rotary work implement attachment according to the present invention. This rotary work implement attachment uses the above-described rotary work tool A as a drive source. The casing 2 is for rotating bolts and nuts, and has a substantially flat and elongated rectangular shape, and a pair of rotary working tool support pieces provided at a base end of the casing 2 and protruding to one side along the longitudinal direction. 3 and 3.

An input window 4 is provided at the base end on both sides of the casing 2, and a non-circular hole 9 of an input gear 6 is opened inside the input window 4, and the non-circular hole 9 is formed. The output shaft 48 of the rotary working tool A is fitted into the hole 9. An output window 5 is provided at both ends of the casing 2, and a non-circular hole 10 of the output gear 8 is opened inside the output window 5. The heads of bolts and nuts, which are the members to be rotated, are fitted into 10.

The shapes of the non-circular holes 9 and 10 are not limited to hexagonal holes as shown in the figure, but may be quadrangular or other polygonal holes, and may be star-shaped (see FIG. 20). Good.

As shown in FIG. 3, the rotary work implement attachment 1 includes an input gear 6 and a torque transmission gear 7 which are connected to and removably connected to an output shaft 48 of the rotary work tool A. , And an output gear 8 having a non-circular hole 10 at the center. The input gear 6, the torque transmission gear 7,..., And the output gear 8 are respectively arranged in a line in the substantially flat and elongated rectangular casing 2 so as to sequentially mesh from the base end to the front end. .

Further, the torque transmitting gears 7 and the output gear 8
And the number of teeth of the input gear 6 is set to be smaller than the number of teeth of the output gear 8. For example, when the value of the torque transmission efficiency between the gears is 0.95, the number of teeth of the torque transmission gears 7 and the output gear 8 is set to 18, and the number of teeth of the input gear 6 is set to 15. Thereby, the input torque of the input gear 6 and the output torque of the output gear 8 can be made substantially the same. That is, it is possible to prevent a decrease in output-side torque.

The casing 2 has an input window 4 and an output window 5, and is disposed between a pair of side plates 11, 11 forming both side surfaces, and between the pair of side plates 11, 11. The input gear 6, the torque transmitting gear 7,..., And the intermediate plates 13, 13 having a row of windows 12 in which the output gear 8 is rotatably housed are formed in a stacked manner.
Specifically, an intermediate plate is provided between the side plates 11 and 11.
13, 13; an input gear 6, a torque transmission gear 7,..., An output gear 8, metal ring members 23, 24, 25, and a cylindrical member 27.
And the shaft members 26 are arranged, and the side plates 11, 11 and the intermediate plates 13, 13 are connected and integrated by a screw member (not shown).

The base end of one of the two intermediate plates 13, 13 is extended toward the base end and has a hole 17, through which a mounting screw 16 is inserted. A mounting piece 14 having 17 is integrally formed. As shown in FIGS. 3 and 4, mounting pieces 18, 18 extend in a perpendicular direction from the base ends of the rotary working tool support pieces 3, 3, and the mounting pieces 1
Elongated holes 15, 15 parallel to the direction in which the pair of rotary working tool support pieces 3, 3 are opposed to each other are formed in 8, 18 respectively. Specifically, the rotary working tool support piece 3 is formed by welding and integrating two L-shaped fittings on each other.

Thus, the mounting pieces 18 of the two support pieces 3, 3 are superimposed on the mounting piece 14 of the intermediate plate 13, and furthermore, a holding metal 20 having screw holes 19, 19 and a through hole are formed. twenty one,
A holding bracket 22 formed with 21 is overlapped from the outside on both sides, and a mounting screw 16 is inserted through the through-hole 21, the long hole 15, and the hole 17, and the tip side of the mounting screw 16 is screwed into the screw hole 19. Then, the support pieces 3 are fixed to the intermediate plate 13.

In this manner, the pair of rotary working tool support pieces 3, 3 are configured such that the mutual spacing dimension S can be adjusted. That is, when the mounting screw 16 is loosened, the pair of rotary working tool support pieces 3, 3 are in a direction parallel to the long hole 15 of the mounting piece 18.
That is, it is possible to slide in the direction ─── approaching and separating from each other, and the mutual spacing dimension S can be adjusted. And after adjustment,
What is necessary is just to tighten the mounting screw 16.

Further, the rotary working tool support pieces 3, 3 are formed of a metal that is relatively thin and brittle compared to the material of the casing 2, and is configured to bend when an excessive torque is input. That is, as shown in FIG. 5, when an excessive torque is input to the rotating work tool A, the extending portion 47 of the rotating work tool A swings around the axis of the output shaft 48, and One support piece 3 is bent. As a result, excessive torque is not input any more, and damage to gears such as the input gear 6 and the casing 2 can be prevented.

When using the attachment 1 for a rotary work tool, first, as shown in FIG. 8, the output shaft 48 of the rotary work tool A is connected to the non-circular hole 9 of the attachment 1.
And the extending portion 47 of the rotary work tool A is firmly held between the rotary work tool support pieces 3 and 3 of the attachment 1.

Then, the tip of the casing 2 is brought close to a member to be rotated such as a nut or a bolt head to be rotated. At this time, since the casing 2 has a substantially flat and elongated rectangular shape, it can be easily inserted into a narrow gap. Thereafter, the member to be rotated is inserted into the non-circular hole 9 of the output gear 8. Then, if the swing operation lever 45 of the rotary working tool A is swung inward, the rotated member can be rotated.

It should be noted that, as shown in FIG.
The total number of the input gears 6, the torque transmission gears 7,... And the output gears 8 is 5, so that the output gears 8 rotate in the same direction as the input gears 6, but of course rotate in the opposite direction. May be. Also, when a large torque is required when loosening or strongly tightening the rotated member, the gripping portion 46 is manually moved by the hand while the lever 45 of the rotary working tool A is swung inward. 8, the member to be rotated may be rotated using both the rotational driving force of the rotary working tool A and the force of a human hand.

As described above, according to the attachment for a rotary working tool, it is possible to easily rotate bolts and nuts in a narrow place which cannot be accommodated by the existing air ratchet wrench. In addition, the bolts and nuts at such a narrow place and at deep positions can be reached and reliably rotated.

Further, the side plate 11 and the intermediate plate 13 of the casing 2 can be easily manufactured by processing a relatively thin metal plate with a laser beam machine or a press machine. It can be manufactured easily and efficiently. Therefore, the attachment for the rotary working tool can be mass-produced with simple and inexpensive equipment.

The present invention can be modified in design in addition to the above-described embodiment. For example, the cost can be further reduced by forging or casting the intermediate plate 13 and the like. The number of the torque transmission gears 7 may be other than three as shown in FIG.
It is also desirable to use one sheet. In some cases, the number of the torque transmission gears 7 may be two or four. In such a case, the rotation direction of the input gear 6 and the rotation direction of the output gear 8 are reversed. In addition, the entire shape of the casing 2 may be, for example, a substantially elongated circular shape other than the substantially flat and elongated rectangular shape.

In another embodiment, as shown in FIGS. 6 and 7, a cylindrical member is formed on the inner surface of the non-circular hole 10 of the output gear 8.
Non-circular hole formed in the cylindrical member 32
A bolt or nut, which is a member to be rotated, is fitted to 31. More specifically, a circumferential groove 28 is provided on the inner surface of the non-circular hole 10 of the output gear 8, and a C-shaped elastic ring body 29 made of spring steel is provided in the circumferential groove 28.
Is inserted. The non-circular hole 10 has a locking groove 30 on its outer peripheral surface which engages with and releasably engages with the elastic ring body 29, and has a non-circular hole 31 smaller than the non-circular hole 10.
The cylindrical member 32 having the above structure is detachably inserted and exchanged.

Specifically, the non-circular hole 10 of the output gear 8
And, the cylindrical member 32 has a hexagonal cross-sectional shape,
The rectangular locking grooves 30 are formed at the six corners of the outer peripheral surface of the cylindrical member 32.
Are formed. The locking groove 30 is formed at an intermediate portion of the cylindrical member 32 in the axial direction, at a position slightly closer to one end and a position slightly closer to the other end than the intermediate portion. Thereby, the cylindrical member
32 can be attached to the output gear 8 so as not to be accidentally dropped.
The protruding length B of the 32 output gears 8 from the output gear 8 can be changed in three stages, and the usability is improved.

By attaching the cylindrical member 32 to the output gear 8 in this manner, it is possible to cope with a rotating member having a small diameter. The plurality of cylindrical members 32 having different sizes of the non-circular hole portions 31 are provided.
Is preferably provided in a replaceable manner. If you do that,
It is possible to flexibly cope with a change in the size of a rotated member such as a bolt or a nut. The shape of the non-circular hole 31 of the tubular member 32 is not limited to a regular hexagon, but may be a quadrangle, another polygon, or a star (see FIG. 20).

Further, the locking grooves 30 provided on the outer peripheral surface of the cylindrical member 32 are, for example, as shown in FIGS.
It may be triangular, and more specifically, the shape of the cross section of the locking groove 30 is, for example, as shown in FIGS.
As shown in (C), a substantially right triangle, a substantially equilateral triangle (or an isosceles triangle), and other triangles may be used.
Also, an arrangement in which these are freely combined may be adopted.

The locking groove 30 shown in FIG.
First groove wall 301 formed in a direction perpendicular to the axis of 32
And a second groove wall 302 formed in a direction inclined outward from the inner end of the first groove wall 301 with respect to the axis.
The radial cross-sectional shape of the locking groove 30 is the first groove wall 301.
, A second groove wall 302, an outer end of the first groove wall 301, and a second groove wall
A straight line (not shown) connecting to the outer end of 302 forms a substantially right triangle. In this case, the cylindrical member 32 is inserted into the non-circular hole 10 of the output gear 8 in the direction of the arrow to be fitted, and in the fitted state, the cylindrical member 32 is easily pulled out in the direction of the arrow, It does not come off in the direction of the arrow.

The locking groove 30 shown in FIG. 12B is a cylindrical member.
It consists of two groove walls 304, 305 formed at the same inclination angle outward and opposite to each other with respect to the axis of 32. The length of the two groove walls 304, 305 and the length of the two groove walls 304, 305 The length of a straight line (not shown) connecting the outer ends of the 305 is set to be equal to each other, and the cross-sectional shape in the radial direction of the locking groove 30 is formed in a substantially equilateral triangular shape. In this case, the cylindrical member 32 may be inserted into the non-circular hole portion 10 of the output gear 8 from any of the directions indicated by the arrows. It is easy to pull out in the same direction. Note that only the lengths of the two groove walls 304 and 305 may be equal, and the cross-sectional shape may be formed as an isosceles triangle.

FIG. 12C shows the locking groove 30.
However, there are two groove walls 307 and 308 formed at different inclination angles outwardly in opposite directions with respect to the axis of the tubular member 32. In this case, it is preferable to insert the cylindrical member 32 in the direction of the arrow. In the fitted state, the tubular member 32 is relatively lightly pulled out in the direction of the arrow, but hardly pulled out in the direction of the arrow. The shape of the cross section of the locking groove 30 may be appropriately selected from the above-described shapes shown in FIGS. 12A, 12B, and 12C and other shapes in consideration of use conditions and the like. Alternatively, these may be appropriately combined and arranged.

On the other hand, the wire diameter and the shape of the (C-shaped) elastic ring body 29 made of a spring steel wire can also be appropriately set, and the shape in the free state is, for example, as shown in FIGS. )
As shown in (C), the shape may be formed into a perfect circle, an ellipse, an egg-shaped circle, or the like, and the holding force of the tubular member 32 with respect to the non-circular hole 10 is changed by selecting the wire diameter and shape. be able to. For example, when the wire diameter is increased, the holding force also increases. Further, if the shape is an ellipse or an egg-shaped circle, the holding force can be made larger than that of a perfect circle.

As shown in FIG. 14, before the cylindrical member 32 is attached to the casing 2, the elastic ring body 29 has a circumferential groove 28 formed on the inner surface of the non-circular hole 10 of the output gear 8.
It should just fit in. FIG. 15 shows a state in which the elastic ring body 29 is fitted. In addition, as shown in FIG. 13C, by forming the bent pieces 291 at both ends of the elastic ring body 29, the fitting into the circumferential groove 28 becomes easy.

On the other hand, as shown in FIG. 10, by changing the distances X and Y from the ends of the locking grooves 30 of the cylindrical member 32, the cylindrical member on the side to which the member to be rotated is fitted. The protrusion length B (see FIG. 16) of the 32 can be changed. For example, in the mounting state as shown in FIGS. 16 and 17, the protruding length B of the tubular member 32 can be set relatively large, and when the tubular member 32 is mounted upside down ( (Not shown), the protrusion length is reduced. The elastic ring body 29 in this case uses a perfect circular shape.

FIGS. 18 and 20 show the non-circular hole 31 of the cylindrical member 32. FIG.
FIG. 18 shows a case where the cylindrical member 32 is attached to the non-circular hole 10 of the casing 2, and FIG.
FIG. 20 is a cross-sectional view showing a state in which the cylindrical member 32 is attached to the non-circular hole 10; FIG. 20 is a sectional view showing the cylindrical member 32 attached to the non-circular hole 10;
It is the figure which looked at from the bottom. Also in this case, the positions of the locking grooves 30...
Since they are arranged in rows, if the cylindrical members 32 are mounted upside down (not shown), the protruding length can be reduced (see FIG. 16).

[0043]

Since the present invention is configured as described above, the following effects can be obtained.

According to the attachment for a rotary working tool according to the first aspect, bolts and nuts in a narrow place that cannot be accommodated by an existing air ratchet wrench can be easily rotated. Further, there is an advantage that it is easy to reach a bolt or a nut at a deep position in such a narrow place.

Then, the rotating work tool A is attached to the base of the casing 2.
Can be fixed and held firmly on the end side. Moreover, excessive torque
At the time of input, the rotating work tool support piece 3 is bent and
The tool A swings around the axis of the output shaft 48 with respect to the casing 2.
Because it can move freely, the input gear 6 and the torque transmission gear 7
Damage to the output gear 8 and the casing 2 can be prevented.
You. Then, only the rotating work tool support piece 3 needs to be replaced.
No.

An attachment for a rotary working tool according to claim 2.
According to the report, a relatively thin metal plate is
By using a machine such as
The rate 11 and the intermediate plate 13 can be easily created. Soshi
And the casing 2 can be easily and efficiently
Can be manufactured. Moreover, the casings 2 having different sizes are used.
Even when creating, it is necessary to use a professional
Since it is only necessary to change the gram input, manufacturing is simpler.
You. Then, the rotary working tool A can be firmly fixed and held on the base end side of the casing 2. In addition, when an excessive torque is input, the rotary work tool support piece 3 is bent and the rotary work tool A can swing about the axis of the output shaft 48 with respect to the casing 2, so that the input gear 6 and the torque transmission gear 7 Thus, damage to the output gear 8 and damage to the casing 2 can be prevented. Then, it is only necessary to replace the rotating work tool support piece 3.

According to the attachment for the rotary working tool according to the third aspect, the distance S between the pair of rotary working tool support pieces 3 can be adjusted, so that the size of the rotary working tool A such as an air ratchet wrench can be adjusted. It is possible to flexibly cope with the thickness of the extension portion 47 and the like, and to firmly hold the rotary working tool A.

According to the attachment for a rotary working tool according to the fourth aspect , the cylindrical member 32 can be detached and exchanged to cope with a difference in the size of a member to be rotated such as a bolt or a nut.
Rotation work can be performed reliably.

According to the attachment for the rotary working tool according to the fifth aspect , the tubular member 32 can be easily inserted from the side of the second groove wall 302, and in the fitted state, the tubular member 32 is attached to the first groove wall 30.
It is easy to come off in the direction of 1 and does not come off in the direction of the second groove wall 302.

According to the attachment for a rotary working tool according to the sixth aspect , the tubular member 32 may be inserted from any direction, and in the fitted state, the tubular member 32 is substantially the same in any direction. It is easy to fall out.

According to the attachment for a rotary working tool according to the seventh aspect , the cylindrical member 32 is formed with the groove wall 30 (with a small inclination angle).
8, the tubular member 32 is relatively lightly pulled out toward the groove wall 307 in the fitted state, and is hardly pulled out toward the groove wall 308 (having a large inclination angle). .

According to the attachment for the rotary working tool according to the eighth, ninth or tenth aspect , the holding force of the cylindrical member 32 can be reduced by variously selecting the shape of the C-shaped elastic ring body 29 in the free state. Can be adjusted appropriately.

According to the attachment for a rotary working tool according to the eleventh aspect , the locking grooves 30 are set at different distances from the end face of the cylindrical member 32, respectively, so that the cylindrical shape from the output window 5 of the casing 2 is formed. Since the protruding length B of the member 32 can be set variably, usability can be improved in accordance with use conditions and the like.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of an attachment for a rotary working tool according to the present invention.

FIG. 2 is a plan view.

FIG. 3 is an exploded perspective view.

FIG. 4 is an explanatory diagram of a main part.

FIG. 5 is an explanatory diagram of a use state of a main part.

FIG. 6 is a simplified explanatory view of a main part of another embodiment.

FIG. 7 is a sectional side view of a main part.

FIG. 8 is an explanatory diagram of a use state.

FIG. 9 is an explanatory view of a rotating work tool.

FIG. 10 is a side view of the tubular member.

FIG. 11 is a front view of the tubular member.

FIG. 12 is an explanatory cross-sectional view of a locking groove of a tubular member.

FIG. 13 is an explanatory diagram of an outer shape of an elastic ring body.

FIG. 14 is an assembled perspective view.

FIG. 15 is a sectional view of an output gear.

FIG. 16 is a cross-sectional view illustrating a mounting state of the tubular member.

FIG. 17 is a bottom view showing a mounted state of the tubular member.

FIG. 18 is a diagram illustrating a correspondence between a cylindrical member and an output gear.

FIG. 19 is a partial cross-sectional view showing an attached state of a tubular member.

FIG. 20 is a bottom view showing a mounted state of the tubular member.

[Explanation of symbols]

 2 Casing 3 Rotating work tool support piece 4 Input window 5 Output window 6 Input gear 7 Torque transmission gear 8 Output gear 10 Non-circular hole 11 Side plate 12 Concatenated window 13 Intermediate plate 28 Circumferential groove 29 Elastic ring 30 Locking groove 31 Non-circular hole 32 Cylindrical member 48 Output shaft A Rotary working tool B Projection length S Inter-spacing dimension 301 First groove wall 302 Second groove wall 304 Groove wall 305 Groove wall 307 Groove Wall 308 groove wall

──────────────────────────────────────────────────続 き Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B25B 21/00 B25B 17/00 B25B 23/153

Claims (11)

(57) [Claims] An input gear connected to an output shaft of the rotary work tool so as to be connected to and detachable from the output shaft;
And an output gear 8 having a non-circular hole 10 at the center thereof are arranged in a substantially flat elongated rectangular or substantially elongated circular casing 2 such that they are sequentially meshed from a base end to a distal end. And the casing 2 is provided at the base end of the casing 2.
Parallel to the longitudinal direction of the
A pair of rotating work tool support pieces 3 that bend when torque is input
3. An attachment for a rotary working tool, wherein 3 is provided . 2. A casing 2 having an input window 4 and an output window 5 and disposed between a pair of side plates 11, 11 forming both side surfaces, and between the pair of side plates 11, 11. The input gear 6, the torque transmission gear 7, and the intermediate plate 13 having the cascading window portion 12 in which the output gear 8 is rotatably housed are formed in a stacked manner , and
At the base end of the casing 2, the longitudinal direction of the casing 2
Parallel, protruding to one side and excessive torque input
Are provided with a pair of rotating tool support pieces 3
An attachment for a rotary working tool , characterized in that: 3. A pair of rotating work tool support pieces 3, 3
The attachment for a rotary working tool according to claim 1 , wherein the distance S is adjustable . 4. An inner surface of the non-circular hole 10 of the output gear 8,
A circumferential groove 28 is provided, and C
The elastic ring body 29 of the mold is
The part 10 is engaged with the elastic ring body 29 so that it can be locked and released.
And the output gear 8 has a locking groove 30 on the outer peripheral surface.
A cylindrical member having a non-circular hole 31 smaller than the circular hole 10
4. The attachment for a rotary working tool according to claim 1, 2 or 3 , wherein 32 is detachably inserted . 5. A locking groove provided on the outer peripheral surface of the cylindrical member 32.
The portion 30 is formed in a direction perpendicular to the axis of the cylindrical member 32.
A first groove wall 301 to be formed and an upper end from the inner end of the first groove wall 301
A second groove formed in a direction inclined outward with respect to the axis;
A vertical cross-sectional shape of the locking groove portion 30.
The first groove wall 301, the second groove wall 302, and the first groove wall 301
A straight line connecting the outer end and the outer end of the second groove wall 302 substantially
The attachment for a rotary working tool according to claim 4, wherein the attachment is formed in a right triangle . 6. An engagement groove portion 30 provided on an outer peripheral surface of the cylindrical member 32 is provided in a direction opposite to an axis of the cylindrical member 32.
Two groove walls 30 formed at equal inclination angles toward the outside
4, 305, the length of the two groove walls 304, 305 and the two grooves
The length of the straight line connecting the outer ends of the walls 304 and 305 is equal
Set, longitudinal sectional shape of the locking groove 30, rotation implement attachment according to claim 4, wherein formed in a substantially regular triangle. 7. Two locking grooves 30 formed on the outer peripheral surface of the cylindrical member 32 are formed at different inclination angles outwardly in opposite directions with respect to the axis of the cylindrical member 32. Groove wall 30
The attachment for a rotary working tool according to claim 4, comprising 7,308. 8. The shape of the C-shaped elastic ring body 29 in a free state.
The attachment for a rotary working tool according to claim 4, 5, 6, or 7 , wherein the shape is a perfect circle . 9. The C-type shape in a free state of the elastic ring 29, claim 4, 5, 6 or 7 rotating work tool attachment according a yen elliptical. 10. The attachment for a rotary working tool according to claim 4 , wherein the shape of the C-shaped elastic ring body 29 in a free state is an egg-shaped circle. 11. A lock provided on the outer peripheral surface of the cylindrical member 32.
The grooves 30 are different from the end face of the cylindrical member 32, respectively.
An output window of the casing 2 which is set at a distance.
The protrusion length B of the cylindrical member 32 from 5 can be set variably.
The attachment for a rotary working tool according to claim 4 , wherein the attachment is configured as follows .