JPH0890325A - Mounting structure of cylindrical hole drill - Google Patents

Abstract

PURPOSE: To facilitate the setting work of a cylindrical hole drill to a tool setting part in a simple structure with no screw. CONSTITUTION: A cylindrical fitting part 47 being externally fitted in a drive collar 10 is installed in a cylindrical hole drill 12. A slip-off preventing notch 50 consisting of both axial and circumferential parts is formed in this cylindrical fitting part 47. An engaged member 30 shifting in the axial direction in an interval between an engaged position and a retreating position and plural pieces of projections 42 are installed in the drive collar 10, and with a penetration of these projections 42 into the circumferential directional part from the axial directional part, any slip-off of the cylindrical fitting part 47 is regulated and at this time, the engaged member 30 is entered into the axial part, whereby a relative rotation between the cylindrical hole drill 12 and the drive collar 10 is regulated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a cylindrical perforating tool for perforating a metal plate, a wall plate or the like by receiving rotational driving.

[0002]

2. Description of the Related Art Cylindrical drilling tools, such as so-called hole saws, have a blade portion on the tip end surface thereof. By rotating the cylindrical drilling tool at high speed with this tool mounting part with the center drill for center positioning protruding from the center of the part to the front, the blade part has a circular shape on the metal plate, mortar wall, etc. It is possible to make holes in the. Here, the cylindrical drilling tool may be integrally fixed to the tool mounting portion, but the shape, dimensions, and material of this cylindrical drilling tool are changed depending on the material and plate thickness of the drilling target. On the other hand, as a single type of tool attachment part can be shared in almost all cases, the cylindrical drilling tool is generally configured to be attachable to and detachable from the tool attachment part, depending on the application. Care is taken so that they can be replaced.

Conventionally, as a structure for removably mounting the cylindrical drilling tool on the tool mounting portion, a male screw portion is formed at the tip of the tool mounting portion while the base portion of the cylindrical drilling tool is formed. It is well known that a female screw is formed on the inner peripheral surface and both the screws are screwed together (for example, the actual opening Sho 55-16).
9309). However, in this structure, during use (that is, during high-speed rotation of the cylindrical drilling tool), a considerably large driving torque is applied to the tool mounting portion, and the reaction force acts on the cylindrical drilling tool from the object to be drilled. In order to
The screwed portions of both are in a very tightly tightened state, and an extremely large force is required to loosen the screwed portions, which makes the removal work extremely difficult.

Therefore, in Japanese Patent Laid-Open No. 5-131312, an insertion hole through which the center drill can be inserted is provided at the center of the cylindrical drilling tool, and an axially substantially intermediate portion of the cylindrical drilling tool is provided. A flange portion is formed on the outer peripheral portion, an axial screw hole is opened in the flange portion, the center drill is inserted into the insertion hole, and the tool attachment portion (drive collar in the publication) is inserted in the axial direction. It is shown that the tool attachment portion and the cylindrical hole drilling tool are detachably connected by screwing the tip of the bolt into the screw hole.

According to this structure, the torque applied to the tool mounting portion or the cylindrical drilling tool during use does not act on the bolt, which is the mounting member, as its rotational force. And are not tightened with excessive force. Therefore, when replacing the cylindrical drilling tool, it is possible to loosen the bolt with a normal force and pull it out from the screw hole.

[0006]

SUMMARY OF THE INVENTION In the device of the above publication,
To attach and detach the cylindrical drilling tool, it is still necessary to screw the male screw and the female screw together and to loosen the screw, which requires a dedicated tool and is troublesome. Further, since the torque applied to the tool mounting portion and the cylindrical drilling tool acts as a shearing force on the bolt, there is also a disadvantage that the thread of the bolt is easily deformed.

In view of such circumstances, it is an object of the present invention to provide a mounting structure having a simple structure which does not use a screw and which facilitates mounting and dismounting work of a cylindrical drilling tool with respect to a tool mounting portion.

[0008]

As a means for solving the above problems, the present invention provides a cylindrical hole for detachably mounting a cylindrical hole drilling tool on a tool mounting portion connected to a drive source. In the mounting structure of the tool, a cylindrical fitting portion that is fitted to a part of the outer peripheral surface of the tool mounting portion in the axial direction is provided at the base of the cylindrical hole drilling tool, and in this cylindrical fitting portion, A slip-out preventing notch formed of an axial portion cut in the axial direction from the end portion and a circumferential portion cut in the circumferential direction from the end of the axial portion, and a rotation stopper cut in the axial direction from the end portion. While forming a notch for use, the tool mounting portion is provided with an axial locking hole extending over both the fitting portion into which the cylindrical fitting portion is fitted and the non-fitting portion into which the cylindrical fitting portion is not fitted, In this locking hole, the locking position that extends over the fitting part and the non-fitting part A locking member is provided so as to be movable between the retracted position retracted from the fitting portion, and biasing means for biasing the locking member toward the fitting portion is provided. In the fitting portion, while projecting the projections radially outward from positions different from each other in the circumferential direction,
The width dimension of the retaining notch is set so that the protrusion can enter the retaining notch, and the rotation preventing notch is configured so that the locking member can penetrate the retaining notch. The protrusion and the locking member are set so that the locking member can enter the rotation stop notch in a state where the width dimension of the portion is set and the projection enters the circumferential direction of the slip-out notch. And the relative position with respect to the locking hole is set (Claim 1).

In this structure, the locking member can be inserted into the axial direction of the retaining notch while the protrusion is intruding into the circumferential direction of the retaining notch. It is more preferable to set the relative positions of the locking member and the locking hole so that the axial portion also serves as the rotation stopping locking portion (claim 2).

Further, the locking member is configured to be rotatable about its central axis, and at least the tip end portion of the locking member is set to a shape other than a circular shape, and the locking hole has a non-fitting portion. The cross-sectional shape of the formed region is locked even when the locking member is at a preset first rotation position or at a second rotation position different from the first rotation position. When the locking member is in the first rotation position, the tip of the locking member has a cross-sectional shape of a region formed in the fitting portion in the locking hole. When the portion is insertable and the locking member is in the second rotation position, the leading end portion of the locking member is set to a shape that cannot be inserted, so that more excellent effects as described below can be obtained. (Claim 3).

In this case, as a cross-sectional shape of a region formed in the non-fitting portion in the locking hole, a circular shape having a diameter substantially equal to the maximum diameter of the locking member is preferable. ). Further, it is more preferable that the left and right side surfaces of the locking member when the locking member is in the first rotation position are tapered surfaces in a direction in which the width dimension of the locking member becomes smaller toward the tip. (Claim 5).

[0012]

According to the mounting structure of the first aspect, for example, the cylindrical hole drilling tool can be mounted on the tool mounting portion in the following manner.

The locking member is located at the first rotation position, and the locking member is moved to the locking position (that is, the fitting portion and the non-fitting portion in the locking hole by the urging force of the urging means). Hold it in the straddling position).

While the projection on the outer peripheral surface of the tool mounting portion is inserted into the axial portion of the notch for retaining the cylindrical fitting portion of the cylindrical hole making tool, the cylindrical fitting portion is mounted on the tool mounting portion. The outer peripheral surface of the part is fitted to a predetermined part. At the time of this external fitting, the end portion of the cylindrical fitting portion pushes the locking member back to almost the retracted position against the biasing force of the biasing means.

While the external fitting state is maintained, the cylindrical drilling tool and the tool mounting portion are relatively rotated in a direction in which the projection is inserted into the circumferential direction portion of the retaining notch. As a result, the circumferential position of the locking hole and the circumferential position of the rotation-preventing cutout portion of the tool mounting portion (the axial direction portion of the retaining cutout portion in claim 2) match, and the cylinder is up to that point. The locking member that has been pushed into the retracted position by the end of the groove-shaped fitting portion is inside the rotation stop notch of the tool mounting portion by the urging force of the urging means (in the axial direction of the retaining notch of claim 2). Inserted). By the engagement of the rotation stopping notch and the locking member, relative rotation between the cylindrical hole drilling tool and the tool mounting portion is prevented, and the projection is located at a position within the circumferential portion of the retaining notch. By being held, the cylindrical drilling tool is also prevented from coming off from the tool mounting portion. That is, the cylindrical drilling tool is fixed to the tool mounting portion, and in this state, the two are integrally driven to rotate, so that the drilling work can be performed using the cylindrical drilling tool.

When the cylindrical hole drilling tool is replaced, the locking member is forcibly moved from the locking position to the retracted position by grasping the locking member with a finger or the like, and the cylindrical hole is opened. It suffices to rotate the opening tool relative to the tool mounting portion in a direction opposite to the above direction so that the protrusion faces the axial direction portion of the retaining notch. In this state, the cylindrical fitting portion of the cylindrical drilling tool can be easily pulled out in the axial direction from the tool mounting portion.

In the structure according to the third aspect of the present invention, during the extraction work, the locking member is forcibly moved from the locking position to the retracted position, and then the locking member is moved to the first rotation position. By turning from to the second rotation position, the locking member cannot enter the region of the locking hole located at the fitting portion. That is, even if the locking member is released in this state, the locking member does not return to the locking position but is held at the retracted position. Therefore, the cylindrical drilling tool and the tool mounting portion can be relatively rotated while the locking member is left standing, and the cylindrical drilling tool can be easily pulled out from the tool mounting portion.

Here, in the structure according to the fourth aspect, the cross-sectional shape of the region formed in the non-fitting portion in the locking hole is set to a circle which is substantially equal to the maximum diameter of the locking member. Therefore, the rotation of the locking member at the retracted position is surely permitted by the simple shape setting of the circle, and the locking member is supported in a stable state.

Further, in the structure according to the fifth aspect, the left and right side surfaces of the locking member when the locking member is in the first rotation position become smaller in width dimension of the locking member toward the tip. Since it is a taper surface in this direction, the tip of this locking member can more smoothly enter the portion of the locking hole that is located in the fitting portion, and the locking member can fit in the fitting portion of the locking hole. It is possible to prevent more reliably from being caught at the boundary between the non-fitting part and the non-fitting part and being unable to move to the locking position.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

1 to 3, reference numeral 10 denotes a cylindrical drive collar that constitutes a tool mounting portion of the cylindrical hole drilling tool 12, and an internal thread 14 is engraved on the inner peripheral surface of the drive collar 10. A shank 16 having a male screw on the outer peripheral surface is screwed into the female screw 14, and the shank 16 is connected to a rotary drive source (not shown). A center drill 1 for centering the center of the shank 16 from the tip.
8 is inserted and fixed to the shank 16 so as not to rotate by a retaining member 19 which is inserted into the shank 16 from the side.

At the end of the outer peripheral surface of the drive collar 10 on the side close to the rotary drive source (left side in FIG. 3),
A collar portion (non-fitting portion) 20 having a larger outer diameter than the other portion (fitting portion) is formed. A first locking hole 22 is formed in the collar portion 20 so as to penetrate therethrough in the axial direction.
A second locking hole 24 having a predetermined depth is formed behind the locking hole 22 and is continuous with the locking hole 22. The first locking hole 22 has a circular shape (however, its upper end is cut off), the second locking hole 24 has a height dimension substantially the same as the hole diameter of the first locking hole 22, and It has a rectangular shape with a width dimension smaller than the hole diameter. On the other hand, on the side farther from the rotary drive source (on the right side in FIG. 3) of the drive collar 10, a spring accommodating hole 26 is formed which is aligned with the locking holes 22 and 24. The second locking hole 24 is communicated with a shaft support hole 28 having a smaller diameter than these.

A locking member 30 as shown in FIGS. 4 and 6 to 9 is inserted into the locking holes 22 and 24. The locking member 30 is a columnar member having an outer diameter slightly smaller than the hole diameter of the first locking hole 22, and one end of the locking member 30 is ground so that both side surfaces of this end are tapered surfaces 32. The tapered surface 32 has a tip end surface formed into a substantially rectangular shape as shown in FIG.
In the rotational position in which is directed to the left and right (the position in FIGS. 1 and 6 to 8; the first rotational position), the end portion (tip portion) on the side where the tapered surface 32 is formed is the second locking hole 24. It can be inserted inside, and both taper surfaces 32 turn up and down (Fig. 9).
Position; second rotational position), the tip has a shape such that it cannot be inserted into the second locking hole 24.

A through hole is provided in the central axis of the locking member 30, and the rotation central axis 34 is inserted therethrough. The rotation center shaft 34 is also inserted into the shaft support hole 28 and is rotatably supported in this portion. The rotation center shaft 34 has an end portion on the spring storage hole 26 side at the end thereof. A flange portion 36 having an outer diameter substantially equal to the hole diameter is formed, and the opposite end portion is caulked to form a retaining portion 38, which prevents the rotation center shaft 34 from coming off from the locking member 30. There is. A compression spring (biasing means) 40 is provided around the rotation center shaft 34 in the spring accommodating hole 26, and the elastic force of the compression spring 40 causes the rotation center shaft 3 to rotate.
4 and the locking member 30 are urged toward the tool side (right side in FIGS. 6 to 9).

On the outer peripheral surface of the drive collar 12, pins (protrusions) 42 are fixed at two positions that are a little axially separated from the collar portion 20 and are separated from each other by 180 °. The pin 42 is in a state of protruding radially outward from the outer peripheral surface.

On the other hand, the cylindrical drilling tool 12 is composed of a tubular tool body 44 and a mounting member 46, as shown in FIG. The mounting member 46 is the drive collar 10 described above.
From the side (left side in FIG. 5) closer to the cylindrical fitting portion 47.
And the stepped portion 48 and the tool fixing portion 49 are integrally provided, and the tubular tool body 44 is fitted onto the tool fixing portion 49 and fixed by welding or the like. A cutting blade 44a as shown in FIG. 1 is formed at the tip of the cylindrical tool main body 44, and the cylindrical tool main body 44 is rotatably driven to be pressed against an object to be machined such as a plate material, thereby punching. Is to be done.

In the cylindrical fitting portion 47, the pin 4 is
2 are provided at the positions corresponding to 2
Are formed. The retaining notch 50 is substantially composed of an axial portion 52 that is cut in the axial direction from the end of the cylindrical fitting portion 47, and a circumferential portion 54 that is cut in the circumferential direction from the end of the axial portion 52. L-shaped, each part 52, 5
The width dimension of the entire retaining notch 50 is set so that the pin 42 can enter the inside of the pin 4. Further, the protruding position of the pin 42 so that the end portion of the cylindrical fitting portion 47 contacts the collar portion 20 in a state where the pin 42 penetrates to the end of the circumferential portion 54 (states of FIGS. 1 and 8). The size of the retaining cutout 50 is set, and in this state, the axial direction portion 52 of the one retaining cutout 50 and the second locking hole 2 are set.
2 so that the circumferential positions of 4 match each other.
The relative position in the circumferential direction between 4 and one pin 42 is set.

With this structure, the cylindrical boring tool 12 can be attached to and detached from the drive collar 10 in the following manner.

1) Preparation before mounting (FIGS. 6A and 6B):
The locking member 30 is set to the first rotation position (the rotation position where the two tapered surfaces 32 face to the left and right), and the locking member 30 is locked by the elastic force of the compression spring 40 (the first locking hole 22 and the first locking hole 22 2) It is held at a position where it is inserted into both locking holes 24).

2) Fitting of the cylindrical fitting portion 47 (FIG. 7A)
(B)): At a relative rotational position such that the pin 42 on the outer peripheral surface of the drive collar 10 is inserted into the axial direction portion 52 of the retaining notch 50 in the cylindrical fitting portion 47 of the cylindrical hole making tool 12, The cylindrical fitting portion 47 is fitted on the outer peripheral surface of the drive collar 10 until the pin 42 reaches the end of the axial portion 52. At the time of this external fitting, the end portion of the cylindrical fitting portion 47 causes the locking member 30 to engage the compression spring 4.
It pushes back almost to the retracted position against 0 elastic force.

3) Fixing (FIGS. 8 (a) and 8 (b)): The pin 42 is secured to the notch portion 50 for preventing the pin 42 from being pulled out while the external fitting state is maintained.
The cylindrical drilling tool 12 is inserted in the circumferential direction portion 54 of the drive collar 10 in a direction (counterclockwise direction in FIG. 1).
Rotate against. Accordingly, the circumferential position of the axial direction portion 52 of the one retaining notch 50 and the second locking hole 24.
And the cylindrical fitting portion 4
The locking member 30 pushed into the retracted position by contact with the end portion of 7 is inserted into the circumferential direction portion 24 and the axial direction portion 52 by the elastic force of the compression spring 40. Here, since the front end portion of the locking member 30 is tapered due to the formation of the tapered surfaces 32, the insertion into the second locking portion 24 and the axial direction portion 52 is smooth, and the front end portion is formed. It is possible to more reliably prevent the situation where the hook is caught at the entrance of the second locking portion 24 and cannot be inserted.

By the engagement of the axial portion 52 and the locking member 30 as described above, relative rotation between the cylindrical drilling tool 12 and the drive collar 10 is prevented, and the pin 42 is provided with the above-mentioned notch for retaining. Retaining the position within the radial portion 54 of 50 also prevents the cylindrical drilling tool 12 from slipping out of the drive collar 10. That is, the cylindrical drilling tool 12 is fixed to the drive collar 10. In this state, if both are integrally driven and pressed against a processing object such as a wall plate, the center drill 18 first drills first to determine the hole processing position, and then the cylindrical hole drilling tool 12 By cutting the periphery of the drill 18, a hole having substantially the same diameter as the cylindrical hole drilling tool 12 is drilled.

4) Tool removal (FIGS. 9 (a) and 9 (b)): When the cylindrical drilling tool 12 is to be replaced, first, the locking member 30 is held by a finger or the like. From the position to the retracted position, the locking member 3 is forcibly retracted at this position.
0 is rotated in the first locking hole 22 about the rotation center shaft 34 from the first rotation position to the second rotation position (that is, the rotation position in which both the tapered surfaces 32 face up and down). This allows
The substantially rectangular tip of the locking member 30 and the second locking hole 24 of the same rectangular shape are misaligned, and the tip of the locking member 30 cannot enter the second locking hole 24. Even if the finger is released, the locking member 30 remains held in the retracted position. In this state, the cylindrical drilling tool 12 is rotated relative to the drive collar 10 in the opposite direction (clockwise in FIG. 1) to the pin 42 so as to prevent the pin 42 from coming off.
9A and 9B, the cylindrical fitting portion 47 of the cylindrical drilling tool 12 can be easily axially moved from the drive collar 10 as shown by the arrows in FIGS. Can be pulled out.

As described above, according to the structure of this embodiment,
The cylindrical boring tool 12 can be installed in the drive collar 10 with an extremely simple operation without the troublesome work of screwing the bolts.
It can be attached and detached, and work efficiency can be greatly improved. Further, in the conventional structure, due to the driving torque during use, a shearing force may act on the connecting bolt between the cylindrical drilling tool 12 and the drive collar 10, and the thread may be deformed. In the structure of the embodiment, even if the shearing force acts on the locking member 30 due to the driving torque during use,
There is no adverse effect on the fixed function.

The present invention is not limited to this embodiment, and the following modes can be adopted as examples.

(1) In the above embodiment, by inserting the locking member 30 into the axial direction portion 52 of the retaining notch 50, the cylindrical drilling tool 12 for the drive collar 10 is inserted.
Although the relative rotation of the
At a position different from 0, an anti-rotation notch dedicated to the insertion of the locking member 30 is axially cut from the end of the cylindrical fitting portion 47 to the circumferential direction portion 54 of the anti-rotation notch 50. Pin 4
The formation position of the anti-rotation notch may be set so that the locking member 30 is inserted into the anti-rotation notch in the state where 2 enters. However, if the axial direction portion 52 of the retaining notch 50 is also used as the rotation preventing notch as in the above-described embodiment, the number of man-hours can be reduced by that amount and the cost can be reduced. There is an advantage that the shape fitting portion 47 can have a more advantageous structure in terms of strength.

(2) In the above embodiment, particularly the locking member 3
Drive collar 10 even if 0 is not rotatable
It is possible to fix and remove the cylindrical drilling tool 12 from the. However, in the case of this structure, when the cylindrical drilling tool 12 is removed from the drive collar 10, after the locking member 30 is gripped with a finger or the like and retracted from the locking position to the retracted position, the locking member 30 is removed. Although the cylindrical drilling tool 12 must be rotated while it is gripped, the locking member 30 can be made rotatable as in the above-described embodiment so that the second locking hole 24 cannot enter at the second rotation position. With such a configuration, even if the locking member 30 is released at the second rotation position, the locking member 30 does not return to the locking position. Therefore, the cylindrical hole is opened without gripping the locking member 30. There is an advantage that the tool 12 can be rotated, and the cylindrical drilling tool 12 can be removed more easily.

In the case of this rotatable structure, the shape of the first locking hole 22 is such that at least the locking member 30 has the first rotation position and the second rotation position in the first locking hole 22. However, if the first locking hole 22 is formed into a circular shape that is substantially equal to the maximum diameter of the locking member 30 as in the above-described embodiment, the locking can be reliably performed with a simple shape setting. Member 3
There is an advantage that 0 rotation can be permitted and the locking member 30 can be stably held in the first locking hole 22.

(3) In the present invention, the number of the notch portions and the protrusions for preventing slippage may be plural, and these may be provided at three or more places. In either case, if the retaining notches and the protrusions are provided at equal intervals, there is an advantage that the cylindrical drilling tool can be mounted in the tool mounting portion in a more stable state.

[0040]

As described above, according to the present invention, in the structure in which the cylindrical fitting portion of the cylindrical drilling tool is externally fitted to the tool mounting portion, the cylindrical fitting portion has an axial portion and a circumferential portion. Forming a retaining cutout and an axial rotation stopping notch, and at the same time, the tool mounting portion has a locking member having a locking position and a retracted position, and protruding from the outer peripheral surface. And a plurality of projections that are provided to prevent the cylindrical fitting portion from coming off from the tool mounting portion by the intrusion of the projection from the axial portion to the circumferential portion of the retaining notch, and Since the locking member enters the rotation stopping notch when the projection enters the direction portion, relative rotation between the cylindrical hole drilling tool and the tool mounting portion is restricted. Cylindrical drilling tool with extremely simple operation that does not require mixing There is an effect that can be attached and detached without fail. Also, unlike the conventional case where the cylindrical hole drilling tool and the tool mounting portion are connected by a bolt, there is no inconvenience that the thread of the bolt is deformed due to the driving torque, and the tool and the tool mounting can be performed with a large torque. The fixed function can be favorably maintained even when driving the section.

In the structure according to the second aspect of the invention, the locking member can enter the axial direction portion of the retaining notch while the protrusion penetrates the circumferential portion of the retaining notch. By setting the relative position of the protrusion and the locking member so that the axial direction portion is also used as the rotation stopping locking portion, the number of notches to be formed is reduced to reduce the number of steps. By reducing the number, there is an effect that the cost can be reduced and the cylindrical fitting portion can have a more advantageous structure in terms of strength.

According to the structure of claim 3, the locking member is rotatable, and the shape of the tip of the locking member is fitted in the locking hole when the locking member is in the second rotation position. Since the shape is such that it cannot enter the area located at the joint portion, when the tool is removed, the locking member is retracted from the locking position to the retracted position, and then the locking member is moved from the first rotation position to the second position. The locking member can be held in the retracted position by only turning the rotary member to the rotating position. Therefore, it is possible to perform the work of rotating the cylindrical drilling tool and the tool mounting portion relative to each other while leaving the locking member left, and it is possible to more easily remove the cylindrical drilling tool from the tool mounting portion. is there.

Here, in the structure according to the fourth aspect, the cross-sectional shape of the region formed in the non-fitting portion in the locking hole is set to a circle which is substantially equal to the maximum diameter of the locking member. Therefore, there is an effect that the rotation of the locking member at the retracted position can be surely permitted and the locking member can be held in the locking hole in a stable state by a simple shape setting such as a circular shape.

Further, in the structure according to the fifth aspect, the left and right side surfaces of the locking member when the locking member is in the first rotation position are reduced in width dimension of the locking member toward the tip. Since the taper surface is formed in the direction described above, the tip of the locking member can more smoothly enter the portion of the locking hole that is located at the fitting portion, and the locking member can be inserted in the locking hole to It is impossible to move to the locking position because it is caught at the boundary between the fitting part and the non-fitting part.
There is an effect that can be more surely prevented.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a mounting structure for a cylindrical drilling tool according to an embodiment of the present invention.

FIG. 2 is a front view of a drive collar on which the cylindrical drilling tool is mounted.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view of a locking member provided on the drive collar.

FIG. 5 is a partial sectional side view of the cylindrical drilling tool.

6A is a sectional side view showing a state of a drive collar before fitting the cylindrical hole making tool, and FIG. 6B is a plan view showing the state.

FIG. 7A is a cross-sectional side view showing a state in which a cylindrical hole forming tool is fitted to the drive collar, and FIG. 7B is a plan view showing the state.

FIG. 8A is a cross-sectional side view showing a state in which the cylindrical drilling tool is rotated and fixed to a drive collar, and FIG.
[Fig. 3] is a plan view showing the above state.

9A is a sectional side view showing a state in which the cylindrical hole forming tool is pulled out from the drive collar, and FIG. 9B is a plan view showing the state.

[Explanation of symbols]

10 Drive Collar 12 Cylindrical Hole Drilling Tool 20 Collar Part (Non-Fit Part) 22 First Locking Hole (Part Located in Non-Fit Part in Locking Hole) 24 Second Locking Hole (Fit in Locking Hole) Part located at mating part) 30 Locking member 32 Tapered surface 40 Compression spring (biasing means) 42 Pin (projection) 47 Cylindrical fitting part 50 Notch part for retaining 52 52 Axial part 54 Circumferential part

Claims (5)

[Claims] 1. A mounting structure for a cylindrical drilling tool for detachably mounting a cylindrical drilling tool on a tool mounting portion connected to a drive source, wherein the tool is provided at a base portion of the cylindrical drilling tool. A cylindrical fitting portion that is fitted to a part of the outer peripheral surface of the mounting portion in the axial direction is provided, and an axial portion cut in the axial direction from the end of the cylindrical fitting portion and the end of this axial portion. From the end portion to form a rotation-preventing cutout portion and a rotation-stopping notch portion that cuts in the axial direction from the end portion. A locking hole is provided in the axial direction that spans both the fitting part where the mating part is fitted and the non-fitting part that is not fitted, and the fitting part and the non-fitting part are provided in this locking hole. A locking member is movably provided between the straddle locking position and the retracted position retracted from the fitting portion. And a biasing means for biasing the locking member toward the fitting portion side, and projecting the projections radially outward from positions different from each other in the fitting portion on the outer peripheral surface of the tool mounting portion in the circumferential direction. At the same time, the width dimension of the retaining cutout is set so that the projection can enter the retaining cutout, and the rotation stopper is set so that the locking member can enter the rotation preventing notch. The width dimension of the notch is set, and the engagement member engages with the protrusion so that the locking member can enter the notch for rotation stop in a state where the protrusion enters the circumferential portion of the notch for retaining. A mounting structure for a cylindrical drilling tool, characterized in that the relative positions of a stop member and a locking hole are set. 2. The mounting structure for a cylindrical hole drilling tool according to claim 1, wherein the locking member is provided in the retaining cutout portion in a state where the protrusion penetrates a circumferential portion of the retaining cutout portion. By setting the relative positions of the projection, the locking member, and the locking hole so that the projection can enter the axial portion, the axial portion is also used as the rotation stopping locking portion. Mounting structure for cylindrical drilling tools. 3. The mounting structure for a cylindrical drilling tool according to claim 1 or 2, wherein the locking member is rotatable about its central axis, and at least the tip of the locking member is not circular. In addition to setting the shape, the cross-sectional shape of the region formed in the non-fitting portion in the locking hole is set to the first rotation position when the locking member is in the preset first rotation position. Even when the locking member is in the second rotation position different from the rotation position, the locking member has a shape that can be inserted, and the locking member has a cross-sectional shape of a region formed in the fitting portion in the locking hole. A shape in which the tip portion of the locking member can be inserted when the locking member is in the first rotation position, and the tip portion of the locking member cannot be inserted when the locking member is in the second rotation position. The mounting structure for a cylindrical drilling tool, characterized in that 4. The mounting structure for a cylindrical drilling tool according to claim 3, wherein a cross-sectional shape of a region formed in the non-fitting portion in the locking hole is substantially equal to a maximum diameter of the locking member. A cylindrical drilling tool mounting structure characterized by being set to a circular shape with a diameter. 5. The mounting structure for a cylindrical hole drilling tool according to claim 3 or 4, wherein the left and right side surfaces of the locking member when the locking member is in the first rotation position are the locking members. A mounting structure for a cylindrical drilling tool, characterized in that a tapered surface whose width dimension becomes smaller toward the tip is formed.