JP2023129829A - rotary tool - Google Patents

Abstract

To provide a rotary tool difficult to be loosened without using a tool or an adhesive.SOLUTION: A rotary tool 30 comprises: a body 11 having a butting surface 11a, a cylindrical hole 11c, and a parallel female screw 11b arranged about a rotary shaft 1; a cover 13 fitted to the body 11 and integrally with the body 11, the cover 13 having a cylindrical shaft 13b inserted into the cylindrical hole 11c, an abutment surface 13a that abuts against the butting surface 11d, and a parallel male screw 13c fitted into the parallel female screw 11b; a circumferential groove 17 formed in the cylindrical shaft 13b or the body 11; and a loosening stop ring 15 that is fitted to the circumferential groove 17 and that comes into contact with both the cylindrical shaft 13b and the body 11.SELECTED DRAWING: Figure 2

Description

The present invention relates to rotating tools.

A deburring tool has been proposed that includes a housing, a transmission rod, a recovery rod, a tilting shaft, a spring, a holder, and a rotation-to-linear conversion mechanism (Japanese Patent Laid-Open No. 2020-182998, hereinafter referred to as Patent Document 1).
Furthermore, a roller burnishing tool has been proposed that includes a shank, a housing connected to the shank, a frame supported by the housing and supporting a roller, and a mandrel (Japanese Patent No. 6712113, hereinafter referred to as Patent Document 2).

The rotary tools of Patent Document 1 and Patent Document 2 rotate at a high rotation speed. The shank and housing of the tools disclosed in Patent Documents 1 and 2 have a cap that is fastened with a screw located on the central axis of the tool. Such caps may become loose during acceleration or deceleration of rotation of the tool. To prevent the cap from loosening, the cap may be tightly fastened to the shank by a tool. At this time, special tools may be used. Furthermore, loosening may be prevented by a set screw screwed in from the radial direction. The cap may also be glued to the shank or housing.

An object of the present invention is to provide a rotary tool that is difficult to loosen without using tools or adhesives.

The first aspect of the present invention is
A body arranged around a rotation axis and having an abutting surface, a cylindrical hole, and a parallel female thread;
A cover that is attached to the body and rotates integrally with the body,
a cylindrical shaft portion inserted into the cylindrical hole portion;
an abutting surface that abuts the abutting surface;
a parallel male screw that fits into the parallel female screw;
a cover having;
a circumferential groove formed in the cylindrical shaft portion or the body;
a locking ring attached to the circumferential groove and in contact with both the cylindrical shaft portion and the body;
It is a rotary tool with

The second aspect of the present invention is
A body arranged around a rotating shaft and having an abutment surface, a parallel male thread, and a cylindrical shaft portion;
A cover that is attached to the body and rotates integrally with the body,
a cylindrical hole in contact with the cylindrical shaft;
a parallel female thread that fits into the parallel male thread;
an abutting surface that abuts the abutting surface;
a cover having;
a circumferential groove formed in the cylindrical shaft portion or the cover;
a locking ring attached to the circumferential groove and in contact with both the cylindrical shaft portion and the cover;
It is a rotary tool with

The body having a cylindrical hole may have a cylindrical hole and a female thread in order from the first end. In this case, the root diameter of the female thread may be equal to or less than the inner diameter of the cylindrical shaft portion.
Further, the body having a cylindrical hole may have a female thread and a cylindrical hole in order from the first end. In this case, the root diameter of the female thread is smaller than the inner diameter of the cylindrical shaft portion.
The body having the cylindrical hole may have an abutment surface at the step between the cylindrical shaft and the female thread. A body having a cylindrical hole may have an abutting surface at the tip (first end) of the cylindrical hole or the bottom (second end) of the cylindrical hole. The abutting surface is a flat surface or a conical surface.

The body having a cylindrical shaft portion may have a cylindrical shaft portion and a male thread in order from the first end. In this case, the thread diameter of the male thread may be greater than or equal to the outer diameter of the cylindrical shaft portion.
Further, the body having the cylindrical shaft portion may have a male thread and a cylindrical shaft portion in order from the first end. In this case, the thread diameter of the male thread is smaller than the outer diameter of the cylindrical shaft portion.
The body having the cylindrical shaft portion may have an abutting surface at a step between the cylindrical shaft portion and the male thread. The body having the cylindrical shaft portion may have an abutment surface at the tip (first end) of the cylindrical shaft portion or the base end (second end) of the cylindrical shaft portion. The abutting surface is a flat surface or a conical surface.

The circumferential groove may be formed only in either the body or the cylindrical shaft.
Further, the circumferential groove may be formed in both the body and the cylindrical shaft portion. At this time, the axial positions of the two circumferential grooves are aligned. One of the circumferential groove of the body and the cylindrical shaft portion is a deep circumferential groove, and the other is a shallow circumferential groove. The locking ring is installed in a deep circumferential groove.
For example, the locking ring is an O-ring. For example, lock rings are crushed by 8% to 30% when installed. Preferably, the locking ring is crushed by about 10 to 20% when installed.
The cap is manually screwed onto the rotating body shaft by an operator.
Even if the cap loosens due to inertia generated during rotational acceleration, the frictional force between the O-ring and the shank prevents the screw from loosening.

The locking ring has an annular shape. The locking ring has a circular or rectangular cross section.
The body may have anti-slip properties.

The rotating body fastening joint is suitable for a tool having a maintenance part that is screwed. For example, the rotary tool is a deburring tool or a roller burnishing tool.

According to the present invention, it is possible to provide a rotary tool that can be fastened without using tools or adhesives and is difficult to loosen.

A perspective view of the rotary tool of Embodiment 1 Vertical cross-sectional view of the rotary tool of Embodiment 1 Vertical cross-sectional view of the rotary tool of Embodiment 2

<Embodiment 1>
As shown in FIGS. 1 and 2, the rotary tool 30 of the first embodiment includes a tool body 31, a plug (cover) 13, a piston (slider) 39, a slide ring 43, a ball 45, and a floater 47. , a first coil spring (first elastic body) 37 and a second coil spring (second elastic body) 41. The rotary tool 30 further includes a locking ring 15. The rotary tool 30 is, for example, a deburring tool.

The tool body 31 includes a body 11, a shank 31a, a cylinder hole 31h, a second spring chamber 31e, a housing 31f, a cylinder 31g, a slide groove 31i, a retaining ring 31k, and a ball hole 31m. . The body 11, the shank 31a, the cylinder hole 31h, the second spring chamber 31e, the housing 31f, the cylinder 31g, and the retaining ring 31k are arranged coaxially with the central axis 1.
The plug 13 has a circumferential groove 17. The body 11, the plug 13, the circumferential groove 17, and the locking ring 15 constitute the rotating body fastening joint 10.

The body 11 has a mounting hole 11e. The mounting hole 11e has, in order from the first end (base end), an abutment surface 11a, a female thread 11b, and a cylindrical hole portion 11c. The mounting hole 11e has an opening 11d on the first end surface. The body 11 is a hollow cylindrical shaft having a central axis (rotation axis) 1. The abutting surface 11a, the female thread 11b, and the cylindrical hole 11c are arranged coaxially with the central axis 1 of the body 11.
The abutting surface 11a is the first end surface of the body 11. The abutting surface 11a is, for example, a flat surface. The abutment surface 11a may be a conical surface. When the abutment surface 11a is a conical surface, the apex of the conical surface may be located on either the first end side (base end side) or the second end side (distal end side) of the abutment surface 11a. The female thread 11b is a parallel thread and has a larger diameter than the cylindrical hole 11c. The inner surface of the cylindrical hole portion 11c is finished smoothly.

The plug 13 is attached to the attachment hole 11e and closes the opening 11d. The plug 13 includes, in order from the first end (base end), a head 13d, a contact surface 13a, a male thread 13c, and a cylindrical shaft portion 13b. The plug 13 may have a non-slip member 13f. The head 13d, the contact surface 13a, the male screw 13c, and the cylindrical shaft portion 13b are arranged coaxially with the central axis 1.
The head 13d is located at the first end of the plug 13. The head 13d has, for example, a right cylindrical shape. The anti-slip 13f is, for example, a knurled groove, a vertical groove, or a plurality of protrusions. The anti-slip grooves 13f, which are vertical grooves, are round grooves, and are arranged evenly on the circumference along the central axis 1 on the outer periphery of the head 13d. The outer diameter of the head 13d is, for example, 15 mm to 30 mm.
The contact surface 13a is arranged on the second end surface (tip surface) of the head 13d. The abutment surface 13a abuts against the abutment surface 11a of the body 11. The male thread 13c is a parallel thread and fits into the female thread 11b. The cylindrical shaft portion 13b contacts the cylindrical hole portion 11c. The cylindrical shaft portion 13b and the cylindrical hole portion 11c are a clearance fit.

Note that the abutment surface 11a may be arranged at a step between the female thread 11b and the cylindrical hole portion 11c. In this case, the contact surface 13a is arranged at the step between the male thread 13c and the cylindrical shaft portion 13b.

The circumferential groove 17 has a rectangular cross section and extends in the circumferential direction. The circumferential groove 17 is arranged in the cylindrical shaft portion 13b. The circumferential groove 17 extends over the entire circumference of the cylindrical shaft portion 13b. In accordance with the position of the circumferential groove 17, a shallow circumferential groove may be further arranged in the cylindrical hole portion 11c.

Note that the circumferential groove 17 may not be arranged in the cylindrical shaft part 13b, but may be arranged in the cylindrical hole part 11c. That is, the body 11 may have the circumferential groove 17. In this case, a shallow circumferential groove may be arranged in the cylindrical shaft portion 13b in accordance with the position of the circumferential groove 17.

The locking ring 15 has enough elasticity to be crushed by hand. The locking ring 15 is an annular ring having a round or square cross-sectional shape. The locking ring 15 is made of natural rubber or synthetic rubber, for example. For example, the locking ring 15 is a rubber O-ring. For example, the crushing rate of the locking ring 15 is about 15%. The crushing rate of the locking ring 15 is approximately 8 to 30%. If the crushing rate of the locking ring 15 exceeds 30%, it becomes difficult to tighten it by hand. When the crushing rate of the locking ring 15 is less than 8%, the locking effect is reduced.

In addition, the body 11 may have the cylindrical hole part 11c and the internal thread 11b in order from a 1st end. In this case, the cylindrical hole 11c has the same diameter as the female thread 11b or has a larger diameter than the female thread 11b. In this case, the plug 13 includes, in order from the first end, a head 13d, a cylindrical shaft portion 13b, and a male thread 13c.

The plug 13 is attached to the attachment hole 11e and tightened by hand of the operator. At this time, the abutting surface 13a abuts against the abutting surface 11a, and a fastening torque is generated.

The shank 31a is attached to the main shaft or tail stock of the processing machine. The shank 31a is, for example, a straight shank or a tapered shank. The cylinder 31g has a hollow cylindrical shape and is arranged at the second end (tip) of the tool body 31.
The housing 31f has a larger diameter than the cylinder 31g, and is arranged at the center of the tool body 31. The housing 31f has a hollow cylindrical second spring chamber 31e that opens on the distal end side.

The cylinder hole 31h is arranged inside the cylinder 31g. The cylinder hole 31h has an opening at the tip. The cylinder hole 31h is connected to the mounting hole 11e. The outer surface of the cylinder 31g is a cylindrical surface and constitutes the inner surface of the second spring chamber 31e.
The retaining ring 31k is arranged at the center of the cylinder 31g. The slide groove 31i penetrates the cylinder 31g and extends along the central axis 1. The slide groove 31i is located in the middle of the housing 31f in the axial direction.
The ball hole 31m penetrates the cylinder 31g and supports the ball 45. The ball hole 31m is located slightly closer to the proximal end than the retaining ring 31k. The diameter of the ball hole 31m is substantially the same as the diameter of the ball 45.

The piston 39 includes a pusher 39a, a guide pin 39b, and a spring guide 39c. The pusher 39a has a disc shape and reciprocates within the cylinder hole 31h. The guide pin 39b extends in the radial direction of the pusher 39a. The guide pin 39b contacts the side surface of the slide groove 31i. The guide pin 39b is guided within the slide groove 31i, and the pusher 39a reciprocates within the cylinder hole 31h. The slide groove 31i regulates the reciprocating width of the pusher 39a. The spring guide 39c is arranged on the first end surface of the pusher 39a. The outer diameter of the spring guide 39c is substantially the same as the inner diameter of the first coil spring 37. The spring guide 39c guides the first coil spring 37.

The first coil spring (first elastic body) 37 is arranged between the plug 13 and the piston 39. The first coil spring 37 biases the piston 39 in the distal direction.

The slide ring 43 has a hollow cylindrical shape and includes a relief portion 43a, a pressing surface 43b, an outer cylindrical surface 43c, and a second spring guide 43d. The slide ring 43 is mounted inside the second spring chamber 31e and reciprocates between the retaining ring 31k and the bottom surface of the second spring chamber 31e. When the slide ring 43 slides toward the proximal end, the relief portion 43a matches the ball hole 31m. At this time, the ball 45 escapes to the outside in the radial direction of the cylinder hole 31h and is housed in the relief portion 43a.

The pressing surface 43b is arranged closer to the proximal end than the relief portion 43a. When the slide ring 43 is sliding in the distal direction, the pressing surface 43b presses the ball 45 inward in the radial direction. At this time, a portion of the ball 45 protrudes inside the cylinder hole 31h.
The second spring guide 43d is a cylindrical hole arranged at the base end of the slide ring 43. The inner diameter of the second spring guide 43d is substantially equal to the outer diameter of the second coil spring 41.

The second coil spring 41 is installed between the second spring chamber 31e and the slide ring 43. The second coil spring 41 biases the slide ring 43 in the distal direction. The second coil spring 41 is guided by a second spring guide 43d.

The floater 47 has a cylindrical shape and includes an outer cylindrical surface 47a, a ball groove 47b, and a tool mounting hole 47c. The outer cylindrical surface 47a slides into the cylinder hole 31h and reciprocates along the central axis 1 inside the cylinder hole 31h. The ball groove 47b is a round groove extending along the central axis 1, and is arranged on the outer cylindrical surface 47a. The tip tool 3 is mounted in the tool mounting hole 47c. When the floater 47 reciprocates, the ball 45 moves relatively within the ball groove 47b.

For example, the rotary tool 30 is attached to the main shaft of a processing machine and rotates together with the main shaft. The rotation of the shank 31a is transmitted to the floater 47 via the ball 45 and the ball groove 47b. The tip tool 3 rotating together with the floater 47 comes into contact with the burr on the workpiece, and deburring is performed. If there are variations in the workpiece, the floater 47 slides along the central axis 1 to absorb the variations. Thereby, the rotary tool 30 can be uniformly deburred.

The strength of the deburring process of the rotary tool 30 can be adjusted by changing the strength of the first coil spring 37. Here, the plug 13 can be rotated by the operator's hands without using a fastening tool. Thereby, the first coil spring 37 can be easily replaced.

The rotary tool 30 rotates at a very high speed (for example, 10,000 to 30,000 revolutions per minute). If the plug 13 loosens when the rotation of the rotary tool 30 accelerates or decelerates, the extrusion force of the floater 47 changes, and the deburring effect changes. According to the rotary tool 30 of this embodiment, a frictional force is generated between the inertia force and elastic force of the locking ring 15 and the locking ring 15 and the circumferential groove 17 and the cylindrical hole portion 11c. Therefore, even when the plug 13 is tightened by hand without using a fastening tool, loosening of the plug 13 is suppressed when the rotation of the rotary tool 30 accelerates or decelerates. Further, loosening of the plug 13 due to vibration of the rotary tool 30 is suppressed. Furthermore, even when the manual tightening torque of the plug 13 is insufficient or when the user forgets to tighten the plug 13, the loosening of the plug 13 is suppressed by the locking ring 15.

Further, the circumferential groove 17 of this embodiment is arranged in the cylindrical shaft portion 13b. Therefore, when the rotary tool 30 rotates at high speed, the locking ring 15 receives centrifugal force and comes into close contact with the cylindrical hole 11c. Thereby, the contact area between the locking ring 15 and the cylindrical hole portion 11c increases, and the locking effect of the locking ring 15 is promoted.
Furthermore, since the circumferential groove 17 is disposed in the cylindrical shaft portion 13b, it is easier to manufacture the rotating body fastening joint 10, and the locking ring 15 is Easy to replace.

<Embodiment 2>
Hereinafter, with reference to FIG. 3, a rotary tool 70 of a second embodiment will be described. The rotary tool 70 of this embodiment is a roller burnishing tool.
As shown in FIG. 3, the rotary tool 70 of this embodiment includes a tool body 71, an adjustment ring 73, an adjustment nut 75, a thrust bearing 76, a key (rotation stopper) 74, a housing 77, and a coil spring. (elastic body) 81, a cover 113, a frame 79, and one or more rollers 83. The rotary tool 70 rotates around the central axis (rotary axis) 1. The tool body 71, the adjustment ring 73, the adjustment nut 75, the thrust bearing 76, the housing 77, the coil spring (elastic body) 81, the cover 113, and the frame 79 are arranged coaxially with the center axis 1. Ru. Housing 77 has a body 111. The body 111, the cover 113, the circumferential groove 117, and the locking ring 115 constitute the rotating body fastening joint 100.

The tool body 71 has a cylindrical shape and includes a shank 71a, a slide shaft 71b, a slide groove 71c, a male thread 71d, a stem 71f, and a mandrel 71e. The shank 71a is, for example, a straight shank or a Morse taper shank. The slide shaft 71b is arranged at the center of the tool body 71. The male screw 71d is arranged on the outer cylindrical surface of the slide shaft 71b. The slide groove 71c extends parallel to the central axis 1 and is arranged on the slide shaft 71b. The slide groove 71c has, for example, a rectangular cross section.
The stem 71f is arranged from the center to the tip of the tool body 71, and connects the mandrel 71e and the slide shaft 71b. The mandrel 71e is a truncated cone with a narrow tip, and is arranged at the tip of the tool body 71.

The adjustment nut 75 has an annular shape and includes a female thread 75a, a first spline shaft 75b, and a retaining ring 75c. The female thread 75a is arranged on the inner surface of the adjustment nut 75, and is fitted with the male thread 71d. The first spline shaft 75b is arranged at the tip of the outer surface of the adjustment nut 75. The retaining ring 75c is arranged on the outer diameter of the base end of the adjustment nut 75.

The adjustment ring 73 has an annular shape and is connected to the base end of the adjustment nut 75. The adjustment ring 73 has an inner cylindrical surface 73a, a retaining ring groove 73b, a second spline shaft 73c, and a keyway 73d. The inner cylindrical surface 73a is the inner surface of the adjustment ring 73, and has a larger diameter than the diameter of the threads of the male thread 71d. A retaining ring 75c is inserted into the retaining ring groove 73b. The second spline shaft 73c is arranged at the base end of the outer diameter portion of the adjustment ring 73. The keyway (rotation prevention groove) 73d is arranged on the inner cylindrical surface 73a. Adjustment ring 73 rotates freely relative to adjustment nut 75.
The key 74 is inserted between the key groove 73d and the slide groove 71c.

The housing 77 has an adjustment chamber 77a, a first spline hole 77b, and a second spline hole 77c. The housing 77 has a hollow cylindrical shape and has a body 111 at the tip. The housing 77 reciprocates along the central axis 1 with respect to the tool body 71.
The adjustment chamber 77a is an internal cavity on the inner tip side of the housing 77. The adjustment chamber 77a houses an adjustment ring 73, an adjustment nut 75, a thrust bearing 76, a frame 79, and a coil spring 81 in order from the base end side.

The first spline hole 77b is arranged on the inner surface of the central portion of the housing 77, and slides on the first spline shaft 75b. The second spline hole 77c is arranged on the inner surface of the base end of the housing 77, and slides on the second spline shaft 73c. Here, the first spline hole 77b is longer than the second spline hole 77c. Specifically, when the housing 77 is slid in the proximal direction, the second spline hole 77c comes off the second spline shaft 73c, but the first spline hole 77b does not come off the first spline shaft 75b. When the operator rotates the housing 77 while pulling the housing 77 toward the proximal end, the axial position of the adjustment nut 75 changes, and the installed length of the coil spring 81 changes.

The body 111 includes, in order from the tip (first end), a cylindrical shaft portion 111c, a male thread 111b, an abutment surface 111a, and a non-slip portion 111d. The cylindrical shaft portion 111c is a right cylinder centered on the central axis 1. The male thread 111b is a parallel thread centered on the central axis 1, and has a larger diameter than the cylindrical shaft portion 111c. The abutment surface 111a is the base end surface of the male thread 111b. The abutment surface 111a may be a flat surface or a cylindrical surface. The anti-slip member 111d is, for example, a knurled groove, a vertical groove extending in the direction of the central axis 1, or a protrusion. The anti-slip 111d may be omitted.

The cover 113 is cap-shaped and covers the opening on the tip side of the adjustment chamber 77a. The cover 113 has, in order from the tip, a cylindrical hole 113b, a female thread 113c, and an abutment surface 113a. The cover 113 may have a non-slip surface 113d. The cylindrical hole portion 113b contacts the cylindrical shaft portion 111c. The cylindrical hole portion 113b and the cylindrical shaft portion 111c are a loose fit. The female thread 113c fits into the male thread 111b. The abutting surface 113a abuts against the abutting surface 111a. The anti-slip 113d is arranged on the outer peripheral surface of the cover 113. The anti-slip 113d is, for example, a knurled groove, a vertical groove extending in the direction of the central axis 1, or a protrusion.

Note that the abutment surface 111a may be arranged at a stepped portion between the male thread 111b and the cylindrical shaft portion 111c. In this case, the contact surface 113a is arranged at a step between the cylindrical hole 113b and the female thread 113c.

The circumferential groove 117 is arranged in the cylindrical shaft portion 111c. The locking ring 115 is installed in the circumferential groove 117. The locking ring 115 is, for example, an O-ring, and is crushed when installed in the circumferential groove 117.
Note that the circumferential groove 117 may be arranged in the cylindrical hole portion 113b. The circumferential groove 117 and the locking ring 115 can be deformed and the arrangement can be changed in the same manner as the circumferential groove 17 and the locking ring 15 of the first embodiment.

The frame 79 has one or more roller holding holes 79a, a collar 79b, and a spring guide 79c. The frame 79 has a hollow cylindrical shape. The frame 79 is arranged radially outward of the stem 71f and the mandrel 71e so as to be rotatable with respect to the stem 71f and the mandrel 71e.
The roller holding hole 79a is arranged at the tip of the frame 79, facing the mandrel 71e. The roller holding hole 79a has a rectangular cross-sectional shape when viewed from the outside in the radial direction, and passes through the frame 79. The plurality of roller holding holes 79a are arranged rotationally symmetrically about the central axis 1.
The collar 79b is arranged at the base end of the frame 79. The flange 79b may be in contact with the thrust bearing 76. The spring guide 79c is arranged closer to the tip than the collar 79b. The outer diameter of the spring guide 79c is substantially equal to the inner diameter of the coil spring 81.

The coil spring 81 is arranged between the collar 79b and the cover 113 inside the adjustment chamber 77a. Coil spring 81 biases frame 79 in the proximal direction relative to mandrel 71e. Coil spring 81 is guided by spring guide 79c.

The roller 83 has a truncated cone shape with an apex angle that is half that of the mandrel 71e. The diameter of the roller 83 decreases toward the base end. Each roller 83 is rotatably supported in each roller holding hole 79a.

The rotary tool 70 is inserted into the construction hole while rotating. The construction hole has an inner diameter slightly smaller than the circumscribed circle of the roller 83. When the roller 83 is inserted into the construction hole, the roller 83 and the frame 79 receive a thrust load, and the roller 83 moves toward the proximal end with respect to the mandrel 71e. Then, the circumscribed circle of the roller 83 becomes larger, and the roller 83 burnishes the construction hole. The amount of expansion of the diameter of the circumscribed circle of the roller 83 is changed depending on the strength of the coil spring 81 and the length of the coil spring 81 installed.

The rotary tool 70 rotates at a very high speed (eg, 10,000 to 30,000 revolutions per minute). If the cover 113 loosens when the rotary tool 70 rotates or stops, the machining diameter changes. According to the rotary tool 70 of this embodiment, even when the cover 113 is tightened by hand without using a fastening tool, loosening of the cover 113 is suppressed when the rotation of the rotary tool 70 accelerates or decelerates. be done. Further, the cover 113 is prevented from loosening due to vibration of the rotary tool 70. Further, even if the manual tightening torque of the cover 113 is insufficient or if the cover 113 is forgotten to be tightened during use, the loosening of the cover 113 is suppressed by the locking ring 15.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention, and all technical matters included in the technical idea described in the claims are included in the present invention. subject to. Although the embodiments described above are preferred examples, those skilled in the art can realize various alternatives, modifications, variations, or improvements based on the contents disclosed in this specification. These are within the scope of the appended claims.

11, 111 Body 11a, 111a Abutment surface 11b Female thread (parallel female thread)
11c Cylindrical hole 13 Plug (cover)
13a, 113a Contact surface 13b Cylindrical shaft portion 13c Male thread (parallel male thread)
15, 115 Locking ring 17, 117 Circumferential groove 111b Male thread (parallel male thread)
111c Cylindrical shaft portion 113 Cover 113b Cylindrical hole portion 113c Female thread (parallel female thread)

Claims (7)

A body arranged around a rotation axis and having an abutting surface, a cylindrical hole, and a parallel female thread;
A cover that is attached to the body and rotates integrally with the body,
a cylindrical shaft portion inserted into the cylindrical hole portion;
an abutting surface that abuts the abutting surface;
a parallel male screw that fits into the parallel female screw;
a cover having;
a circumferential groove formed in the cylindrical shaft portion or the body;
a locking ring attached to the circumferential groove and in contact with both the cylindrical shaft portion and the body;
Rotary tool with. A body arranged around a rotating shaft and having an abutment surface, a parallel male thread, and a cylindrical shaft portion;
A cover that is attached to the body and rotates integrally with the body,
a cylindrical hole in contact with the cylindrical shaft;
a parallel female thread that fits into the parallel male thread;
an abutting surface that abuts the abutting surface;
a cover having;
a circumferential groove formed in the cylindrical shaft portion or the cover;
a locking ring attached to the circumferential groove and in contact with both the cylindrical shaft portion and the cover;
Rotary tool with. The circumferential groove is formed in the cylindrical shaft portion,
The rotary tool according to claim 1 or 2. the locking ring is crushed and installed in the circumferential groove;
The rotary tool according to any one of claims 1 to 3. The locking ring is a rubber ring.
The rotary tool according to any one of claims 1 to 4. The cover has anti-slip properties.
The rotary tool according to any one of claims 1 to 5. a slider inserted into the body and reciprocating along the rotation axis;
an elastic body disposed between the slider and the cover and urging the slider;
further having,
The rotary tool according to any one of claims 1 to 6.

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