JP3229321U - Rotating tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary tool capable of performing stable machining while being reliably and easily mounted on a rotary drive device. SOLUTION: A rotary tool processes a workpiece while being rotationally driven by a rotary drive device 10, and has a rotary shaft portion 20, a machining portion 40, a surrounding portion 50, and a restraint portion 70. Be prepared. The rotating shaft portion 20 has a held portion 32, and the held portion 32 is held by the tool holding portion 14 of the rotary drive device 10 so as to be relatively displaceable in the axial direction within a limited range. The surrounding portion 50 is rotatable relative to the rotating shaft portion 20. The restraining portion 70 connects the surrounding portion 50 to the rotation driving device 10 so that the held portion 32 restrains the axial movement of the rotating shaft portion and the surrounding portion 50 at the position where the held portion 32 is deeply inserted into the tool holding portion 14. To do. [Selection diagram] Fig. 1

Description

The present invention relates to a rotary tool capable of machining an workpiece by being rotationally driven while being held by a rotary drive device.

Conventionally, in order to process a workpiece such as cutting or drilling a pipe or an outer wall material, a rotary tool capable of performing the processing while being rotationally driven has been widely used. Such a rotary tool includes a held portion held by a rotary drive device, generally a main body machine of a power tool, and torque is applied to the held portion from the rotary drive device.

Patent Document 1 below discloses a rotary tool provided with a shaft member 100 as shown in FIG. The shaft member 100 integrally has a rear end portion constituting the held portion 102 and a main body shaft 103 adjacent to the front side of the held portion 102. A blade (for example, a rotary cutter) (for example, a rotary cutter) shown in the drawing which is processed in contact with the workpiece is connected to the front end portion of the main body shaft 103.

The held portion 102 is a portion that is detachably held by the rotation driving device 110, and includes a held shaft 104 and a locked groove 106. The held shaft 104 has a diameter one size smaller than that of the main body shaft 108 adjacent to the front side (left side in FIG. 5), and has a modified cross section (for example, a hexagonal cross section) which is a cross section other than a circle. The locked groove 106 is a peripheral groove formed over the entire circumference of the held shaft 104 in the middle portion in the axial direction, and has a substantially arc shape in the vertical cross section of the held shaft 104.

The rotary drive device 110 has a device main body 112 and a tool holding unit 114. The device main body 112 incorporates an electric motor (not shown). The tool holding portion 114 is connected to the output shaft of the electric motor and is rotationally driven while holding the held portion 102 of the rotary tool. The tool holding portion 114 has a fitting hole having a shape corresponding to the shape of the deformed cross section of the held shaft 104, and the electric motor is formed by fitting the fitting hole and the held shaft 104. It is possible to transmit torque to the held shaft 104 through the tool holding portion 114. The tool holding portion 114 includes a plurality of locking members 116. Each of the plurality of locking members 116 has a spherical shape, and by fitting into the locked groove 106, the held portion 102 is locked. That is, the held portion 102 is prevented from coming off from the tool holding portion 114.

Utility Model Registration No. 3146237

The rotary tool shown in FIG. 5 is prone to rattling and shaking with respect to the rotary drive device, which may hinder stable machining. Specifically, in the rotary tool, the locking member 116 of the tool holding portion 114 and the held portion are held so that the held portion 102 can be reliably and easily mounted on the tool holding portion 114. So-called "play" is provided between the locked groove 136 of 102. That is, the locked groove 136 is provided with a large width with respect to the locking member 116. On the other hand, the main body shaft adjacent to the held portion 102 so that the held portion 102 can be reliably inserted into the tool holding portion 114 regardless of the variation in the dimensions of the held portion 102. A relatively large axial clearance δ is secured between the rear end of the 108 and the tip of the tool holding portion 114. These correspond to the position where the held portion 102 corresponds to the tool holding portion 114 in a limited range (specifically, the position where the locking member 116 hits the front end and the rear end of the locked groove 136). Allows axial displacement (with respect to position), thereby allowing axial displacement and swing of the body shaft 108 and the position of the machined portion by the cutting tool portion of the front end of the rotary tool. May cause instability.

An object of the present invention is to provide a rotary tool capable of solving such a problem, which can perform stable machining while being reliably and easily mounted on a rotary drive device. To do.

Provided by the present invention is a rotary tool that processes a workpiece while being rotationally driven by a rotary drive device, and includes a rotary shaft portion, a machining portion, a surrounding portion, and a restraint portion. The rotating shaft portion has a rear end portion constituting the held portion and a front end portion on the opposite side thereof. The held portion can be attached to and detached from the tool holding portion so as to rotate integrally with the tool holding portion included in the rotation driving device, and is displaced relative to the tool holding portion in the axial direction within a limited range. It is held by the tool holding portion so as to be possible. The processed portion is connected to the front end portion of the rotating shaft portion so as to rotate integrally with the rotating shaft portion, and the workpiece can be processed by coming into contact with the workpiece while rotating. It is possible. The surrounding portion has a shape that surrounds the rotating shaft portion at a position outside the radial direction of the rotating shaft portion, and is capable of maintaining a non-rotating state regardless of the rotation of the rotating shaft portion. It is connected to the rotating shaft portion so that it can rotate relative to the rotating shaft portion and is integrally displaced in the axial direction with the rotating shaft portion. The restraining portion holds the surrounding portion so as to restrain the axial movement of the rotating shaft portion and the surrounding portion with respect to the tool holding portion at a position where the held portion is deeply inserted into the tool holding portion. It is connected to the rotary drive device.

According to this rotary tool, stable machining can be realized while enabling reliable and easy mounting of the held portion on the tool holding portion. Specifically, in the rotary tool, so-called play is provided between the tool holding portion and the rotary shaft portion, that is, both can be relatively displaced within a limited range in the axial direction, as in the conventional rotary tool. By having the tool holding portion hold the held portion of the rotating shaft portion in such a manner, it is possible to guarantee reliable and easy mounting of the held portion on the tool holding portion. Moreover, the restraint portion of the rotary tool connects the rotating shaft portion with the surrounding portion connected to the rotating shaft portion so as to be rotatable relative to the rotating shaft portion, and the rotating shaft portion and the rotating shaft portion. By restraining the axial movement of the surrounding portion with respect to the tool holding portion, the position of the machined portion is stabilized and good machining can be realized.

The restraining portion preferably includes, for example, a first restraining member and a second restraining member. The first restraining member is said to have a first engaging portion that is engaged with the surrounding portion so as to restrict the axial displacement of the surrounding portion in the axial direction, and the outer surface of the rotation driving device. It includes a second engaging portion having a shape capable of engaging with the outer surface so as to be slidable in the axial direction, and is arranged so as to straddle the surrounding portion and the rotation driving device. .. The second restraint member includes the first restraint member and the rotation drive device so as to restrain the first restraint member to the rotation drive device at a position where the held portion is deeply inserted into the tool holding portion. It is placed across.

According to this rotary tool, the rotary shaft portion and the surrounding portion can be suitably restrained to the rotary drive device with a simple configuration based on the combination of the first and second restraint members.

More specifically, the second restraint member includes a stretchable member capable of elastically expanding and contracting, and a connecting portion for connecting both ends of the stretchable member to the first restraint member. It is preferable that the first restraining member has a length that allows it to be wound around the rotary drive device so as to urge the first restraining member rearward by its elastic restoring force while elastically deforming in the extension direction. The telescopic member makes it possible to appropriately restrain the rotating shaft portion and the surrounding portion by utilizing the elastic return force of the telescopic member without modifying the shape or structure of the rotary driving device.

As described above, according to the present invention, there is provided a rotary tool that can be reliably and easily mounted on a rotary drive device and that can perform stable machining.

FIG. 5 is a cross-sectional side view of a rotary tool and a rotary drive device holding the rotary tool according to the embodiment of the present invention, wherein the surrounding member of the rotary tool is restrained by the rotary drive device by the first and second restraint members. It is a figure which shows. It is a cross-sectional side view of the rotary tool and the rotary drive device, and is the figure which shows the state before the surrounding member is restrained by the rotary drive device by the 1st and 2nd restraint members. It is a front view which saw the rotary tool from the tip side. It is a rear view which looked at the rotary tool from the rear end side. It is a side view which shows the held part of the conventional rotary tool.

Preferred embodiments of the present invention will be described with reference to the drawings.

1 to 4 show a rotary tool according to an embodiment of the present invention and a rotary drive device 10 for holding the rotary tool. The rotary drive device 10 rotationally drives the rotary tool at high speed while holding the rotary tool. The rotary tool can process an workpiece while being rotationally driven by the rotary drive device 10.

The rotation drive device 10 has a device main body 12, a grip portion 13, and a tool holding portion 14. The apparatus main body 12 has a shape extending along a central axis (extending in the left-right direction in FIG. 1), for example, a shape having a cylindrical outer peripheral surface, and incorporates an electric motor as a rotation drive source. The grip portion 13 extends downward from the rear portion of the device main body 12 and has a shape that can be gripped by an operator. The tool holding portion 14 is rotatably arranged around the central axis at the position of the front end of the apparatus main body 12 on the central axis. The tool holding portion 14 is connected to the output shaft of the electric motor. The tool holding unit 14 can be rotationally driven at high speed together with the rotary tool by the electric motor while holding the rotary tool detachably.

The rotary tool includes a main body shaft 20, a relay shaft 30, a cutter 40, a surrounding member 50, a first restraint member 60, and a second restraint member 70.

The main body shaft 20 and the relay shaft 30 are connected to each other in the axial direction to form a rotating shaft portion according to the present invention. The rotating shaft portion has a rear end portion constituting the held portion and a front end portion on the opposite side thereof. The held portion can be attached to and detached from the tool holding portion so as to rotate integrally with the tool holding portion included in the rotation driving device, and is displaced relative to the tool holding portion in the axial direction within a limited range. It is held by the tool holding portion so as to be possible.

Specifically, the main body shaft 20 has a substantially cylindrical shape extending along the central axis, and is a relay connecting portion 22 constituting a rear end portion (left end portion in FIG. 1) of the main body shaft 20 and vice versa. It has a cutter mounting portion 24 forming a front end portion (right end portion in FIG. 1) on the side, and an intermediate portion 26 between them. The relay connecting portion 22 is a portion connected to the relay shaft 30. A screw hole 23 along the central axis is formed in the relay connecting portion 22, and the screw hole 23 is opened rearward. The cutter 40 is detachably mounted on the cutter mounting portion 24.

The relay shaft 30 is an adapter that relays the main body shaft 20 and the tool holding portion 14. Specifically, the relay shaft 30 includes a held portion 32 which is a rear end portion of the relay shaft, a main body shaft connecting portion 34 which is a front end portion on the opposite side thereof, and an intermediate portion 36 located between them. It has a stopper portion 38 integrally.

The held portion 32 is a portion corresponding to the rear end portion of the entire rotating shaft portion, and is a portion that is detachably held by the tool holding portion 14. The held portion 32 includes a held shaft 32a and a locked groove 32b. The held shaft 32a has a diameter one size smaller than that of the main body shaft 108 adjacent to the front side (left side in FIG. 5), and has a modified cross section (for example, a hexagonal cross section) which is a cross section other than a circle. The locked groove 32b is a peripheral groove formed over the entire circumference of the held shaft 32a in the middle portion in the axial direction, and has a substantially arc shape in the vertical cross section of the held shaft 32a.

On the other hand, the tool holding portion 14 has a fitting hole having a shape corresponding to the shape of the deformed cross section of the held shaft 32a, and by fitting the fitting hole and the held shaft 32a, the said Torque can be transmitted from the electric motor to the held shaft 32a through the tool holding portion 14. The tool holding portion 14 includes a plurality of locking members 16. Each of the plurality of locking members 16 has a spherical shape and can move in the radial direction within a limited range, and is restrained from the outside in the radial direction at a position where the locking member 16 fits into the locked groove 32b. The held portion 32 is detachably locked. That is, the held portion 32 is prevented from coming off from the tool holding portion 14.

The intermediate portion 36 is adjacent to the front side of the held portion 32 and has a cross-sectional shape that is one size larger than the cross-sectional shape of the held portion 32, that is, is outward in the radial direction from the outer surface of the held portion 32. Has a protruding shape. Therefore, the intermediate portion 36 has a rear end surface 35 facing the rear side at a position radially outer of the held portion 32.

The width dimension (the dimension in the axial direction of the rotary tool) of the locked groove 32b is set larger than the size of the plurality of locking members 16. Therefore, the entire rotating shaft portion including the relay shaft 30 can be displaced relative to the tool holding portion 14 in the axial direction between the position shown in FIG. 1 and the position shown in FIG. It has become. The position shown in FIG. 1 is the position where the locking member 16 corresponds to the front end of the locked groove 32b, and the position where the held portion 32 is deeply inserted into the tool holding portion 14, that is, the rearmost side. The rearmost position of. In other words, the axial gap between the front end surface 15 of the tool holding portion 14 and the rear end surface 35 of the intermediate portion 36 is the position where the minimum gap δ1 (δ1 may be 0). The position shown in FIG. 2 is the position where the locking member 16 corresponds to the rear end of the locked groove 32b, and the frontmost position where the held portion 32 protrudes to the frontmost side from the tool holding portion 14. .. In other words, it is the position where the gap becomes the maximum gap δ2 (> δ1).

The main body shaft connecting portion 34 is a front end portion connected to the relay connecting portion 22 of the main body shaft 20. Specifically, the main body shaft connecting portion 34 has an outer peripheral surface on which a male screw is engraved, and the relay shaft is screwed into the screw hole 23 formed in the relay connecting portion 22. 30 and the main body shaft 20 are connected in the axial direction. The stopper portion 38 protrudes radially outward from the main body shaft connecting portion 34 at a position immediately behind the main body shaft connecting portion 34, and the stopper portion 38 comes into contact with the rear end surface of the relay connecting portion 22. By screwing the main body shaft connecting portion 34 to the position, the relative position of the main body shaft 20 and the relay shaft 30 in the axial direction is determined. That is, the shaft length of the entire rotating shaft portion is determined.

The cutter 40 is the front end portion of the rotating shaft portion (the said in this embodiment) so as to rotate integrally with the rotating shaft portion (main body shaft 20 and relay shaft 30 connected to each other in this embodiment). It is a processing portion that is connected to the cutter mounting portion 24) and can process (cut in this embodiment) the workpiece by coming into contact with the workpiece while rotating.

The cutter 40 has a cutter body 42 and a cutting blade 44. The cutter body 42 has a disk shape, and a through hole is formed in the center thereof. The nut 45 is screwed into the male screw formed on the tip portion 25 with the tip portion 25 of the cutter mounting portion 24 inserted into the through hole from the rear side, whereby the cutter is inserted into the cutter mounting portion 24. The main body 42 is fixed. A washer 46 is appropriately sandwiched between the nut 45 and the cutter body 42. The cutting blade 44 is made of, for example, a cemented carbide metal material and is fixed along the outer peripheral edge of the cutter body 42. The cutting blade 44 cuts the workpiece by pressing the entire cutter 40 against the workpiece while the entire cutter 40 is rotationally driven at high speed.

The surrounding member 50 constitutes the surrounding portion according to the present invention, and surrounds the rotating shaft portion at a position on the radial outer side of the rotating shaft portion. Specifically, the surrounding member 50 according to this embodiment has a cylindrical shape that surrounds the main body shaft 20 over substantially the entire axial direction of the main body shaft 20. A radial gap is secured between the outer peripheral surface of the main body shaft 20 and the inner peripheral surface of the surrounding member 50.

The surrounding member 50 can maintain a non-rotating state regardless of the rotation of the rotating shaft portion including the main body shaft 20. Specifically, the surrounding member 50 is connected to the rotating shaft portion so as to be relatively rotatable with respect to the rotating shaft portion and to be integrally displaced in the axial direction with the rotating shaft portion. In this embodiment, a pair of front and rear bearings 52 are interposed between the inner peripheral surface of the surrounding member 50 and the outer peripheral surface of the intermediate portion 26 of the main body shaft 20. Each of the pair of bearings 52 includes an inner ring fixed on the outer peripheral surface of the intermediate portion 26, an outer ring fixed on the inner peripheral surface of the surrounding member 50, and a plurality of rolling elements (for example, a sphere). The plurality of rolling elements are interposed between the inner ring and the outer ring, and roll so as to allow relative rotation of both, that is, relative rotation of the main body shaft 20 and the surrounding member 50.

The first restraint member 60 and the second restraint member 70 constitute a restraint portion according to the present invention. The restraint portion is the tool holding portion 14 of the rotating shaft portion and the surrounding member 50 at the rearmost end position (the position where the held portion 32 is deeply inserted into the tool holding portion 14 as shown in FIG. 1). The surrounding member 50 is connected to the rotation driving device 10 so as to restrain the movement in the axial direction with respect to the surrounding member 50. In other words, the restraint portion is at the rearmost end position where the held portion 32 cannot be inserted deeper into the tool holding portion 14 (in this embodiment, the locking member 16 hits the front end of the locked groove 32b. By pulling it backward to the position), the axial movement of the held portion 32 is restrained.

The first restraining member 60 is arranged so as to straddle the surrounding member 50 and the rotation driving device 10. The first restraint member 60 according to this embodiment is composed of a surrounding member restraint disc 61 and a rod 62.

The surrounding member restraint disk 61 has a substantially disk shape surrounding the surrounding member 50, and is attached to the surrounding member 50 so as to restrict the movement of the surrounding member 50 to the front side. Specifically, a flange portion 54 is formed at the rear end of the surrounding member 50 so as to project radially outward from the other portions. The surrounding member restraining disk 61 has a tubular main body portion 64 fitted to the outer peripheral surface of the surrounding member 50, and abuts on the front side surface of the flange portion 54 to the front side of the surrounding member 50. Restrain the movement. That is, the main body portion 64 constitutes a portion that is engaged with the surrounding member 50 so as to regulate the displacement of the surrounding member 50 to the front side in the axial direction, that is, a first engaging portion according to the present invention. To do. A screw hole 65 penetrating the surrounding member restraining disc 61 in the radial direction is formed at an appropriate position, and a set screw (not shown) is screwed into the screw hole 65 to allow the surrounding member 50 to be screwed onto the outer peripheral surface of the surrounding member 50. The position of the surrounding member restraint disc 61 is fixed.

The rod 62 extends in the axial direction and is arranged so as to connect the surrounding member restraint disk 61 and the device main body 12 of the rotation drive device 10. Specifically, the rod 62 has a front end portion 68 connected to the surrounding member restraint disc 61 and a rear end portion 69 on the opposite side thereof. The front end portion 68 has an outer peripheral surface on which a male screw is engraved. The surrounding member restraint disc 61 has a connecting portion 66 that further protrudes outward in the radial direction from the main body portion 64, and the front end portion 68 is screwed into a screw hole 67 formed in the connecting portion 66. The surrounding member restraint disc 61 and the rod 62 are connected to each other.

The rear end portion 69 constitutes a portion having a shape capable of sliding in the axial direction with respect to the upper surface of the device main body 12 of the rotary drive device 10, that is, a second engaging portion according to the present invention. For example, when the upper surface of the apparatus main body 12 has a concave groove extending in the axial direction (front-back direction), the rear end portion 69 is fitted into the concave groove so as to be slidable along the concave groove. It is good that it is formed in a shape that allows. As described above, it is preferable that the shape of the rear end portion 69 is appropriately set according to the shape of the outer surface of the rotation driving device 10. This makes it possible to use the shape and structure of the existing rotary drive device 10 as they are, and eliminates the need for modification of the shape and the like.

The second restraining member 70 restrains the first restraining member 60 on the rotation driving device 10 at the rearmost end position, that is, the position where the held portion 32 is inserted deepest into the tool holding portion 14. It is arranged so as to straddle the first restraint member 60 and the rotation drive device 10.

Specifically, the second restraint member 70 according to this embodiment includes a tension coil spring 72 and a connecting metal fitting 74.

The tension coil spring 72 is an elastic member capable of elastically expanding and contracting in the longitudinal direction. The tension coil spring 72 is hung on a portion of the device main body 12 of the rotation drive device 10 on the rear side of the grip portion 13 while being elastically deformed in the tensile direction, and is positioned on the front side of the wound position. Both ends of the tension coil spring 72 have a length that can be connected to the rod 62. The tension coil spring 72 is connected to the rod 62 in such an elastically deformed state, so that the first restraining member 60 including the rod 62, the surrounding member 50, and the rotating shaft portion are rearwardly connected to the rod 62. An urging force in the pulling direction (elastic urging force of the tension coil spring 72) is applied, whereby the rotating shaft portion can be constrained to the rearmost end position.

The connecting metal fitting 74 constitutes a connecting portion that connects both ends of the tension coil spring 72 to the rod 62. Specifically, the connecting fitting has a ring 76 and an openable / closable hook 78 coupled thereto. Hooks 73 formed at both ends of the tension coil spring 72 are hooked on the ring 76. On the other hand, the hook 78 is connected to the rod 62 via the metal fitting 79. The metal fitting 79 is inserted into the hook 78 and the through hole 63 formed at an appropriate position in the rod 62.

According to this rotary tool, so-called axial play is provided between the held portion 32 and the tool holding portion 14 (between the plurality of locking members 16 and the locked grooves 32b in this embodiment). The held portion 32 is provided by the first and second restraining members 60 and 70 regardless of the presence of the play, while enabling the secure and easy mounting of the held portion 32 on the tool holding portion 14. Stable machining can be realized by pulling the rotary shaft portion including the above to the rearmost end position and restraining the rotary shaft portion to the rotary drive device 10 via the surrounding member 50.

For example, when the cutter 40 is used in a downward posture in order to cut a pipe near the ground, the cutter 40 and the cutter 40 are mounted if there is no restraint by the first and second restraining members 60 and 70. The rotating shaft portion is located at the lowermost position due to their own weight, that is, the frontmost position as shown in FIG. 2 (in this embodiment, the plurality of locking members 16 are the rear ends of the locked groove 32b. It is displaced forward (downward in the downward posture) to the corresponding position), and in this state, the cutter 40 may be displaced or shaken (so-called rattling) in the axial direction due to the "play", and stable cutting may not be possible. However, the restraint by the first and second restraint members 60, 70 makes it possible to hold the rotating shaft portion at the rearmost end position shown in FIG. 1 regardless of the downward posture. It enables the realization of good machining with a stable cutting position.

The present invention is not limited to the embodiments described above. The present invention also includes, for example, the following forms.

(A) Rotational drive device The shape and structure of the rotary drive device to which the rotary tool according to the present invention is connected does not matter. As described above, it is preferable that the restraint portion according to the present invention is set according to the shape and the like of the rotation driving device. The specific structure of the tool holding portion is not limited as long as it holds the held portion so as to be detachable and relatively displaceable in the axial direction.

(B) Rotating Shaft The rotating shaft according to the present invention is not limited to the one composed of the main body shaft 20 and the relay shaft 30. The rotating shaft portion may be composed of a single shaft member. For example, the relay shaft 30 may be omitted and the held portion may be formed directly on the main body shaft 20.

The shape of the held portion according to the present invention can also be freely set within a range satisfying the condition that the held portion is held by the tool holding portion so as to be removable and displaceable within a limited range in the axial direction. It is possible. That is, the held portion has the rearmost end position where the rotating shaft portion is inserted deepest (that is, pulled in to the rearmost side) with respect to the tool holding portion, and the rotating shaft portion protrudes to the frontmost side. Anything may be used as long as it is held by the tool holding portion so as to be movable in the axial direction between the frontmost position and the position.

(C) Machining section The machining section according to the present invention may be any as long as it processes the workpiece while being rotationally driven. The processed portion may be, for example, a cylindrical blade as described in Patent Document 1, that is, a hole saw for making a large circular hole in a wall or the like. Alternatively, a grindstone that performs processing other than cutting, for example, a grindstone that polishes the work piece, or a drill that perforates the work piece may be used.

(D) Surrounding portion The surrounding portion according to the present invention may be any as long as it remains stationary so as to be restrained by the restraining portion regardless of the rotation of the rotating shaft portion, and necessarily surrounds the entire rotating shaft portion. It is not limited to what you do. The surrounding portion may, for example, surround the rotating shaft portion only at a portion connected to the surrounding member restraining disc 61. However, the wider the encircling range by the enclosing portion, the lower the degree of exposure of the rotating shaft portion and the higher the safety of the rotating tool. That is, the surrounding portion can be used as both a restraining member and a protective member.

(E) Restraint portion The restraint portion according to the present invention may be any one that constrains the rotating shaft portion at a position where the held portion is inserted deepest into the tool holding portion, and its specific structure is limited. Not done. For example, the restraint portion may be detachably fixed to the rotary drive device by screwing or other means. However, the combination of the first restraint member 60 and the second restraint member 70, particularly the configuration using an elastic member such as a tension coil spring 72, is modified by utilizing the shape of the existing rotation drive device 10. There is an advantage that the rotating shaft portion can be effectively restrained by urging the rotating shaft portion to the rear side without performing the above.

10 Rotation drive device 12 Device body 14 Tool holding part 16 Locking member 20 Body shaft (rotation shaft part)
30 Relay shaft (rotating shaft)
32 Held part 40 Cutter (processed part)
50 Siege member (siege part)
60 1st restraint member 64 Main body (1st engaging part)
69 Rear end (second engaging part)
70 Second restraint member 72 Tension coil spring (expansion member)
74 Connecting bracket (connecting part)

Claims (3)

A rotary tool that processes a workpiece while being rotationally driven by a rotary drive device.
The tool holding portion has a rear end portion constituting the held portion and a front end portion on the opposite side thereof, and the held portion rotates integrally with the tool holding portion included in the rotation drive device. A rotating shaft portion that is detachable and is held by the tool holding portion so that it can be displaced relative to the tool holding portion in the axial direction within a limited range.
A machined portion that is connected to the front end portion of the rotating shaft portion so as to rotate integrally with the rotating shaft portion, and can process the workpiece by coming into contact with the workpiece while rotating. ,
With respect to the rotating shaft portion so as to have a shape surrounding the rotating shaft portion at a position on the radial outer side of the rotating shaft portion and to maintain a non-rotating state regardless of the rotation of the rotating shaft portion. A surrounding portion connected to the rotating shaft portion so as to be relatively rotatable and integrally displaced in the axial direction with the rotating shaft portion.
The surrounding portion is attached to the rotation driving device so as to restrain the axial movement of the rotating shaft portion and the surrounding portion with respect to the tool holding portion at a position where the held portion is deeply inserted into the tool holding portion. A rotary tool with a restraint to connect. The rotary tool according to claim 1, wherein the restraining portion includes a first restraining member and a second restraining member, and the first restraining member displaces the surrounding portion in the axial direction to the front side. It is possible to engage the first engaging portion that is engaged with the surrounding portion so as to be restricted and the outer surface so as to be slidable in the axial direction with respect to the outer surface of the rotary drive device. The second restraining member is arranged so as to straddle the surrounding portion and the rotation driving device, including a second engaging portion having a shape, and the held portion is inserted deepest into the tool holding portion. A rotary tool that is arranged across the first restraint member and the rotary drive device so as to restrain the first restraint member on the rotary drive device at the position. The rotary tool according to claim 2, wherein the second restraint member includes a stretchable member that can be elastically stretched and contracted, and a connecting portion that connects both ends of the stretchable member to the first restraint member. The telescopic member has a length capable of being wound around the rotation driving device so as to urge the first restraining member rearward by its elastic restoring force while elastically deforming in the extending direction. tool.

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