JP2019107718A - Attachment/detachment device for clamp arm of clamp device - Google Patents

Abstract

To make it possible to easily perform attachment/detachment of a clamp arm to/from a clamp rod of a cylinder device.SOLUTION: A clamp arm (3) is detachably attached to a clamp rod (2) which is so inserted in a housing (1) as to be vertically movable. A fitting hole (6) penetrates a left end part (3a) of the clamp arm (3). A storage hole (8), which is formed on a right side of the fitting hole (6), is opened upward. A horizontally movable transmission member (10) is prevented from falling from the storage hole (8). A tie bolt (21), which fits a wedge member (15) fitted into the storage hole (8) to the clamp arm (3), is prevented from falling so as to be movable in a vertical direction with respect to the clamp arm (3).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a device for attaching and detaching a clamp arm to a clamp rod of a clamp device.

Among the clamp devices of this type, there is conventionally one described in Patent Document 1 (International Publication No. 2016/194863). The prior art is configured as follows.
The above-described cylinder device is mounted on the table (in an upward position) such that the clamp rod protrudes upward. A clamp rod is vertically movably inserted into the housing. A clamp arm is removably mounted on the clamp rod. A mounting hole is vertically penetrated at the left end of the clamp arm. An accommodation hole is formed on the upper right side of the mounting hole, and the transmission member and the wedge member engaged with the transmission member from above are detachably mounted in the accommodation hole. When the clamp arm is attached to the clamp rod, the clamp bolt presses the wedge member downward, whereby the wedge member presses the mounting hole via the transmission member and the clamp rod. The receiving hole is pressed.

International Publication No. 2016/194863 Publication

In the above-mentioned clamp device, the transmission member and the wedge member are detachably inserted from above into the accommodation hole opened upward on the upper surface of the clamp arm. For this reason, at the time of the operation of attaching and detaching the clamp arm to the clamp rod, if the clamp arm is operated in the sideways or inverted direction, the transmission member and the hook member may fall out of the accommodation hole. Therefore, it is necessary for the operator to attach and detach the clamp arm to the clamp rod while holding the transmission member and the like from falling out of the accommodation hole, which takes time and effort.
An object of the present invention is to facilitate the operation of attaching and detaching a clamp arm to a clamp rod.

In order to achieve the above object, the present invention has configured the attaching and detaching device of the clamp arm of the clamp device as follows.
A clamp rod 2 is movably inserted into the housing 1 between the distal end side and the proximal end side in the axial direction. The clamp rod 2 has a recess 2a formed at its tip. The clamp arm 3 is detachably mounted on the clamp rod 2. A mounting hole 6 is penetrated in the axial direction at one end 3 a of the one end 3 a and the other end 3 b of the clamp arm 3. A housing hole 8 formed adjacent to the other end 3b of the mounting hole 6 is opened toward the tip. The transmission member 10 is prevented from coming off the accommodation hole 8 so as to be movable in the direction intersecting with the axial direction. The transmission member 10 has a protrusion 12 protruding from the outer peripheral wall of the transmission member 10 toward the one end 3a. The protrusion 12 is inserted into the recess 2a. A wedge member 15 formed to be tapered toward the proximal end is attached to the receiving hole 8. The wedge member 15 is attached to the clamp arm 3 by a fastening bolt 21. The clamp bolt 21 is prevented from coming off so as to be movable in the axial direction with respect to the clamp arm 3. When the clamp arm 3 is attached to the clamp rod 2, the wedge member 15 is pushed toward the base end side, so that the wedge member 15 is inserted into the mounting hole via the transmission member 10 and the clamp rod 2. While pressing 6, the wedge member 15 presses the receiving hole 8.

The present invention has the following effects.
In the present invention, the transmission member and the fastening bolt are prevented from coming out of the receiving hole of the clamp arm. For this reason, at the time of the work of attaching and detaching the clamp arm to the clamp rod, the transmission member and the hook member do not fall out of the accommodation hole even if the clamp arm is turned sideways or upside down. You can easily.

The present invention preferably adds the following configurations (1) to (6).
(1) A first guide groove 14 is formed in one of the inner peripheral wall of the accommodation hole 8 and the outer peripheral wall of the transmission member 10 in a direction intersecting the axial direction. A first projection 26 protruding from the other of the inner peripheral wall of the accommodation hole 8 and the outer peripheral wall of the transmission member 10 is inserted into the first guide groove 14. The transmission member 10 is movable along the first guide groove 14 by the first protrusion 26 in the accommodation hole 8 of the clamp arm 3. The transmission member 10 is prevented from coming off from the accommodation hole 8 by the first protrusion 26 and the first guide groove 14.
In this case, the first guide groove is formed in a direction intersecting the axial direction. Therefore, the first protrusion can move in the cross direction along the first guide groove, but the axial movement of the first protrusion is limited by the peripheral wall of the first guide groove. Therefore, the transmission member can be reliably prevented from falling out of the receiving hole.

(2) The tightening bolt 21 is screwed into the bolt hole 9 formed in the bottom 8 a of the accommodation hole 8. A first locking portion 28 is formed on the peripheral edge on the proximal end side of the bolt hole 9. A first engagement portion 27 is formed at a proximal end portion of the tightening bolt 21 so as to face the first engagement portion 28 so as to be in contact with each other at a predetermined interval. The tightening bolt 21 is moved to the front end side, and the first engaging portion 27 is abutted against the first locking portion 28, whereby the tightening bolt 21 is prevented from coming off with respect to the clamp arm 3. Be done.
In this case, when the tightening bolt is moved to the tip side, the first engagement portion of the tightening bolt is received from the tip side by the first locking portion of the clamp arm, so that the tightening bolt drops off from the clamp arm. It can be prevented reliably.

(3) The bolt insertion hole 19 is formed in the wedge member 15. The tightening bolt 21 inserted into the bolt insertion hole 19 is screwed into the bottom 8 a of the accommodation hole 8. When removing the clamp arm 3 from the clamp rod 2, the second engagement portion 24 provided at an intermediate height portion of the clamp bolt 21 is inserted by loosening the clamp bolt 21 and rotating it. The second locking portion 20 formed in the hole 19 is pressed toward the tip end.
In this case, when the screw driving force of the tightening bolt moves the second engaging portion of the tightening bolt to the tip end side by loosening and rotating the tightening bolt, the second engaging portion The second engaging portion of the member is abutted from the proximal end side. Then, the screw driving force strongly pushes the wedge member toward the tip end side via the second engaging portion and the second locking portion, and the wedge engagement of the wedge member is released. Therefore, when removing the clamp arm from the clamp rod, no dedicated removal jig is required. As a result, the task of removing the clamp arm from the clamp rod is facilitated.

(4) A second guide groove 29 is formed in the axial direction on one of the inner peripheral wall of the accommodation hole 8 and the outer peripheral wall of the wedge member 15. A second protrusion 31 protruding from the other of the inner peripheral wall of the housing hole 8 and the outer peripheral wall of the wedge member 15 is inserted into the second guide groove 29. The wedge member 15 is movable in the axial direction in the accommodation hole 8 via the second guide groove 29 and the second projection member 31. The wedge member 15 is prevented from coming off the accommodation hole 8 by the second guide groove 29 and the second projecting member 31.
In this case, when the wedge member is moved to the tip side along the second guide groove via the second protrusion, the second protrusion is received by the tip wall of the second guide groove, so that the wedge member is removed from the accommodation hole It can be reliably prevented from falling off.

(5) The T-shaped groove 32 is formed along the outer peripheral wall of one of the outer peripheral wall of the transmission member 10 and the outer peripheral wall of the wedge member 15. A T leg 33 protruding from the outer peripheral wall of the transmission member 10 and the other outer peripheral wall of the outer peripheral wall of the wedge member 15 is inserted into the T groove 32.
In this case, the transmission member is prevented from coming off from the accommodation hole so as to be movable in the direction intersecting with the axial direction, and the wedge member is prevented from coming out from the accommodation hole so as to be movable in the axial direction. Further, a T leg 33 protruding from the outer peripheral wall of the transmission member 10 and the other outer peripheral wall of the outer peripheral wall of the wedge member 15 is inserted into the T groove 32. Therefore, in conjunction with the movement of the wedge member to the tip end side, the transmission member is moved to the other end side, and the projection of the transmission member is extracted from the recess of the clamp rod. This facilitates the operation of removing the clamp arm from the clamp rod.

(6) The flange portion 35 protrudes from the outer peripheral wall of the transmission member 10 toward the other end 3b. A through hole 36 is formed in the flange portion 35 in the axial direction. The fastening bolt 21 can be screwed into the bolt hole 9 formed in the bottom 8 a of the receiving hole 8 through the through hole 36. A first locking portion 28 is formed on the proximal end side peripheral edge portion of the bolt hole 9. A first engagement portion 27 is formed at a proximal end portion of the tightening bolt 21 so as to face the first engagement portion 28 so as to be in contact with each other at a predetermined interval. The tightening bolt 21 is moved to the tip end side, and the first engaging portion 27 is abutted against the first locking portion 28 so that the tightening bolt 21 is pulled out with respect to the clamp arm 3 It is stopped.
In this case, the tightening bolt is screwed into the bolt hole through the bolt insertion hole of the wedge member and the through hole of the transmission member, and the tightening bolt is engaged with the clamp arm by the first engaging portion and the first locking portion. Since it is held off, it is possible to reliably prevent the tightening bolt, the hook member and the transmission member from falling off the clamp arm.

FIG. 1 shows a first embodiment of the present invention and is a perspective view of an apparatus for attaching and detaching a clamp arm to a clamp rod of a clamp apparatus. FIG. 2A is a partial view in plan view showing the clamp arm attached to the clamp rod. FIG. 2B is a view corresponding to an arrow view of line 2B-2B in FIG. 2A. FIGS. 3A to 3D illustrate the procedure for temporarily assembling the transmission member and the wedge member to the clamp arm. 3A and 3B are views corresponding to the cross-sectional view of the 3A plane in FIG. 1A. 3C and 3D are views corresponding to the cross-sectional view of the 3C plane in FIG. 1A. FIGS. 4A and 4B are diagrams for explaining the procedure for attaching the clamp arm to the clamp rod, and are respectively partial views similar to FIG. 5A and 5B are diagrams for explaining the procedure for removing the clamp arm from the clamp rod, and are respectively similar to FIG. 2B. 6A and 6B are diagrams for explaining the procedure for removing the clamp arm from the clamp rod. FIG. 7 is a view showing a modification of the first embodiment, and is a plan view similar to FIG. 2A. 8A and 8B show a second embodiment of the present invention. FIG. 9 is a view showing a third embodiment of the present invention, and is a perspective view showing the transmission member and the wedge member of the clamp device. 10A and 10B are diagrams for explaining the procedure for attaching a clamp arm to the clamp rod of the clamp device. FIG. 11 is a diagram showing a fourth embodiment of the present invention.

1 to 6B show a first embodiment of the present invention.
As shown in FIGS. 1 to 2B, the clamp rod 2 is movable in the vertical direction (between the distal end side and the proximal end side in the axial direction) in the housing 1 of the pivoting clamp device and rotatable about its axis It is inserted. The clamp arm 3 is detachably mounted on the clamp rod 2. Hereinafter, the attachment / detachment device will be described based on FIGS. 1 to 2B.

  A groove (recess) 2 a is formed in the circumferential direction at the tip of the clamp rod 2. Further, the mounting hole 6 is vertically penetrated to the left end portion (one end portion) 3 a of the clamp arm 3. A pressing portion 7 is provided below the right end portion (the other end portion) 3b of the clamp arm 3, and the pressing portion 7 presses a workpiece (not shown) as a clamp target downward. The accommodation hole 8 is formed to be adjacent to the upper right side of the mounting hole 6, and the accommodation hole 8 is opened upward (tip side). A bolt hole 9 is formed in the bottom 8 a of the accommodation hole 8.

  The transmission member 10 is inserted from above into the left side portion of the accommodation hole 8. The lower end surface of the transmission member 10 is received by the bottom 8 a of the receiving hole 8. On the left wall (inner peripheral wall) of the transmission member 10, an arc-shaped engagement surface 11 recessed rightward in plan view is formed straight in the vertical direction. The engagement surface 11 is in contact with the outer peripheral surface of the lower wall 2 c formed on the lower side of the groove 2 a of the clamp rod 2. Further, a semi-cylindrical projecting portion 12 is projected leftward in plan view from the upper portion of the left wall of the transmission member 10, and the projecting portion 12 is fitted into the groove 2a of the clamp rod 2 from the right side. . Furthermore, the first receiving surface 13 is formed flat on the right wall (outer peripheral wall) of the transmission member 10 so as to be away from the axial center of the clamp rod 2 as it goes downward. A guide groove (first guide groove) 14 is formed in the side wall of the transmission member 10 in the horizontal direction.

  The wedge member 15 in a temporarily assembled state, which will be described later, is inserted from above into the rightward portion of the accommodation hole 8 described above. A predetermined gap is formed between the lower end of the wedge member 15 and the bottom 8 a of the accommodation hole 8. The wedge member 15 is formed in a semicircular shape in plan view. A first pressing surface 16 is formed flat on the left portion (inner peripheral portion) of the wedge member 15 so as to be away from the axial center of the clamp rod 2 in a downward direction, and the first pressing surface 16 is of the transmission member 10 It is engaged with the first receiving surface 13 from above. Further, the second pressing surface 17 is formed straight in the vertical direction at the right portion (outer peripheral portion) of the wedge member 15. The second pressing surface 17 is engaged with the second receiving surface 18 formed in the receiving hole 8 of the clamp arm 3.

  The bolt insertion hole 19 is vertically penetrated through the wedge member 15, and a locking portion (second locking portion) 20 is formed at an intermediate height portion of the bolt insertion hole 19. A tightening bolt 21 is inserted into the bolt insertion hole 19, and a groove 22 is formed circumferentially at an intermediate height portion of the tightening bolt 21. An annular space is formed between the groove 22 and the bolt insertion hole 19. Further, an insertion hole 23 for communicating between the right portion (peripheral portion) of the wedge member 15 and the bolt insertion hole 19 is formed to have substantially the same height as the groove 22 described above. A plurality of engaging balls (second engaging portions) 24 are inserted into the annular space through the insertion holes 23 described above. The engaging balls 24 face the lower side with the locking portion 20 with a predetermined gap. The insertion hole 23 described above is blocked by another large diameter ball after the engagement ball 24 is inserted.

Prior to attaching the clamp arm 3 to the clamp rod 2, the transmission member 10 and the hook member 15 are temporarily assembled in the receiving hole 8 of the clamp arm 3 in the following procedure, as shown in FIGS. 1 to 3D. .
As shown in FIG. 3A, the transmission member 10 is inserted from above into the left side portion of the accommodation hole 8 of the clamp arm 3, and the transmission member 10 is received by the bottom wall 8 a of the accommodation hole 8. As shown in FIG. 3B, the pin (first projection) 26 is inserted into the through hole 25 formed in the side wall of the clamp arm 3, and the tip of the pin 26 is inserted into the guide groove 14 of the transmission member 10. . As a result, the transmission member 10 is movably prevented in the mounting hole 8 in the horizontal direction.
Subsequently, the wedge member 15 in the temporarily assembled state shown in FIG. 2B is inserted into the accommodation hole 8. Then, as shown in FIGS. 2B and 3C, the first pressing surface 16 of the wedge member 15 is engaged with the first receiving surface 13 of the transmission member 10 from above, and the second pressing surface 17 of the wedge member 15 is Is engaged with the second receiving surface 18 of the receiving hole 8.
Subsequently, when the tightening bolt 21 is tightened and rotated, the lower end portion of the tightening bolt 21 protrudes downward from the lower surface of the clamp arm 3 as shown in FIG. 3D. A retaining ring (first engaging portion) 27 is attached to a mounting groove formed in the circumferential direction at the lower end portion. Thereby, the fastening bolt 21 is prevented from coming off the clamp arm 3.

The clamp arm 3 described above is attached to the clamp rod 2 in the following procedure, as shown in FIGS. 3D to 4B.
First, in the temporarily assembled clamp arm 3 shown in FIG. 3D, the tightening bolt 21 is loosened and rotated. Thereafter, as shown in FIG. 4A, the clamping bolt 21 and the hook member 15 are upward at a position where the snap ring 27 abuts on a locking portion (first locking portion) 28 formed at the lower end of the bolt hole 9 And the transmission member 10 is moved to the right in the housing hole 8.
Subsequently, the mounting hole 6 of the clamp arm 3 is moved to the upper side of the clamp rod 2. Thereafter, the clamp arm 3 is lowered. Then, as shown in FIG. 4B, the mounting hole 6 of the clamp arm 3 is externally fitted to the clamp rod 2. The protrusion 12 of the transmission member 10 is moved leftward in the receiving hole 8, and the protrusion 12 is inserted into the groove 2 a of the clamp rod 2 from the right.
Subsequently, the tightening bolt 21 is tightened and rotated in the bolt hole 9 of the clamp arm 3. Then, as shown in FIG. 2B, the tightening bolt 21 presses the wedge member 15 downward, and the wedge member 15 passes the first pressing surface 16 and the first receiving surface 13 of the transmission member 10, The clamp rod 2 is pressed into the mounting hole 6 of the clamp arm 3. As a result, the reaction force from the mounting hole 6 acts on the wedge member 15 through the clamp rod 2 and the transmission member 10, and the second pressing surface 17 of the wedge member 15 is the second of the accommodation hole 8 of the clamp arm 3. 2 Press the receiving surface 18. As a result, the clamp arm 3 is strongly fixed to the clamp rod 2.

When the clamp rod 2 to which the clamp arm 3 is attached is driven to lock downward, the pressing portion 7 of the clamp arm 3 presses the object to be clamped (not shown) downward. More specifically, the force for lowering the clamp rod 2 is transmitted to the transmission member 10 through the upper wall 2 b formed on the upper side of the groove 2 a of the clamp rod 2 and the upper wall 11 a of the protrusion 12. . Then, the transmitted force is transmitted from the lower end of the transmission member 10 to the clamp arm 3 through the bottom 8 a of the receiving hole 8 of the clamp arm 3. As a result, the pressing portion 7 of the clamp arm 3 presses the object to be clamped (not shown) downward. As a result, the force for lowering the clamp rod 2 is reliably transmitted to the object to be clamped via the transmission member 10 and the clamp arm 3.
Further, in the locked state of the object to be clamped, the reaction force acting on the pressing portion 7 of the clamp arm 3 from the object to be clamped is the bottom 8a and the upper wall 11a of the projecting portion 12 of the transmission member 10 and the groove The clamp rod 2 is received via the upper wall 2b of 2a.
Further, in the locked state of the object to be clamped, the reaction force acting on the clamp arm 3 from the object to be clamped applies a moment in the counterclockwise direction to the upper part of the clamp rod 2 through the clamp arm 3. The counterclockwise moment is mainly received by the outer peripheral surface of the clamp rod 2 at the upper and lower portions of the groove 2 a of the clamp rod 2.

The clamp arm 3 is removed from the clamp rod 2 in the following procedure, as shown in FIGS. 2B and 5A to 6B.
First, in the mounted state of FIG. 2B, when the tightening bolt 21 is loosened and rotated, the screw driving force of the tightening bolt 21 raises the engagement ball 24 through the groove 22 of the tightening bolt 21. Then, as shown in FIG. 5A, the engagement ball 24 abuts on the locking portion 20 of the wedge member 15. Subsequently, the screw driving force strongly pushes the wedge member 15 upward via the engagement ball 24 and the locking portion 20, and the wedge engagement of the wedge member 15 is released. Next, as shown in FIG. 5B, the wedge member 15 is lifted upward until the retaining ring 27 abuts on the locking portion 28 formed at the lower end portion of the bolt hole 9. Subsequently, as shown in FIGS. 6A and 6B, the protrusion 12 of the transmission member 10 is pulled rightward from the groove 2 a of the clamp rod 2. Finally, the clamp arm 3 is removed upward from the clamp rod 2.

The above-described first embodiment exhibits the following advantages.
In the first embodiment described above, the first guide groove 14 is formed in the side wall of the transmission member 10 in the horizontal direction. Therefore, the pin 26 can move horizontally along the guide groove 14, but the vertical movement of the pin 26 is limited by the peripheral wall of the guide groove 14. Therefore, it can be reliably prevented that the tightening bolt 21 falls out of the accommodation hole 8. In addition, when the tightening bolt 21 is moved upward, the retaining ring 27 of the tightening bolt 21 is received from the upper side by the locking portion 28 of the clamp arm 3, so that the tightening bolt 21 is surely pulled off from the clamp arm 3 Can be prevented.
Thereby, at the time of attaching and detaching the clamp arm 3 to and from the clamp rod 2, the transmission member 10 and the wedge member 15 do not fall out of the accommodation hole 8 even when the clamp arm 3 is turned sideways or upside down. Can be easily attached to the clamp rod 2.

  7, 8A and 8B, 9 to 10B, and 11 show a modification of the first embodiment and the second to fourth embodiments of the present invention. In the modification of the first embodiment and the second to fourth embodiments, the same members (or similar members) as the constituent members of the first embodiment described above are in principle given the same reference numerals. Explain.

The modification of the first embodiment shown in FIG. 7 is different from the first embodiment described above in the following points.
A guide groove 14 is formed in the horizontal direction on the inner peripheral wall of the accommodation hole 8 of the clamp arm 3. A pin 26 protrudes from the outer peripheral wall of the transmission member 10. The tip of the pin 26 is inserted into the guide groove 14 of the receiving hole 8. Thus, the transmission member 10 can move in the mounting hole 8 in the horizontal direction along the guide groove 14, but the movement in the vertical direction is limited by the peripheral wall of the guide groove 14. Therefore, even when the clamp arm 3 is turned to the side or upside when the clamp arm 3 is attached to or detached from the clamp rod 2, the transmission member 10 does not fall out of the accommodation hole 8. You can easily put on the work.

The second embodiment shown in FIGS. 8A and 8B is different from the first embodiment described above in the following points.
As shown in FIG. 8A, a guide groove (second guide groove) 29 is formed on the side wall of the wedge member 15 so as to extend in the vertical direction. An insertion hole is formed on the side wall of the clamp arm 3, and a pin (second projection) 31 is attached to the insertion hole. The tip of the pin 31 is inserted into the guide groove 29.

The clamp arm 3 is removed from the clamp rod 2 in the following procedure, as shown in FIGS. 8A and 8B.
As shown in FIG. 8A, when the clamp bolt 3 is loosened and rotated from the state where the clamp arm 3 is mounted on the clamp rod 2, as shown in FIG. 8B, the clamp bolt 21 engages with the groove 22 and the engagement ball. The wedge member 15 is lifted upward along the guide groove 29 through 24. Then, the pin 31 is in contact with the upper end wall of the guide groove 29. This restricts the upward movement of the wedge member 15. As a result, it is possible to reliably prevent the wedge member 15 and the fastening bolt 21 from falling out of the receiving hole 8 of the clamp arm 3.

The point of difference of the third embodiment shown in FIGS. 9 to 10B from the first embodiment described above is as follows.
As shown in FIG. 9, a T-shaped groove 32 is formed in the vertical direction along the right wall surface in the right wall of the transmission member 10. A T leg 33 is formed on the left wall of the wedge member 15 in the vertical direction along the left wall. The T leg 33 of the wedge member 15 is slidably inserted into the T groove 32 of the transmission member 10.

When attaching the clamp arm 3 to the clamp rod 2, the transmission member 10 and the hook member 15 are temporarily assembled in the receiving hole 8 of the clamp arm 3 in the following procedure, as shown in FIGS. 10A and 10B, prior to that. .
The T leg 33 of the wedge member 15 is inserted into the T groove 32 of the transmission member 10 described above (see FIG. 10A). The transmission member 10 and the wedge member 15 are inserted from above into the accommodation hole 8 of the clamp arm 3, and the transmission member 10 is received by the bottom wall 8 a of the accommodation hole 8. The pin 26 is inserted into the through hole 25 formed in the side wall of the clamp arm 3, and the tip of the pin 26 is inserted into the guide groove 14 of the transmission member 10. As a result, the transmission member 10 is movably prevented from moving horizontally in the mounting hole 8 (the upward movement is restricted).
Next, when the tightening bolt 21 is tightened and rotated in the bolt hole 9 of the clamp arm 3, the lower end portion of the tightening bolt 21 protrudes downward from the lower surface of the clamp arm 3 (see FIG. 10B). The retaining ring 27 is mounted in the mounting groove at the lower end. As a result, it is possible to reliably prevent the tightening bolt 21 from falling off the clamp arm 3.

As shown in FIGS. 10A and 10B, the clamp arm 3 is attached to the clamp rod 3 in the following procedure.
First, in the temporarily assembled clamp arm 3, the clamp bolt 21 is loosened and rotated to clamp the retaining ring 27 to a position where the retaining ring 27 abuts on the locking portion 28 formed on the lower peripheral edge of the bolt hole 9. When the bolt 21 and the wedge member 15 are moved upward, the transmission member 10 is moved rightward in the accommodation hole 8 in conjunction with the upward movement of the wedge member 15 (see FIG. 10A).
Subsequently, the mounting hole 6 of the clamp arm 3 is moved to the upper side of the clamp rod 2. Thereafter, the clamp arm 3 is lowered. Then, as shown in FIG. 10A, the mounting hole 6 of the clamp arm 3 is externally fitted to the clamp rod 2.
Subsequently, the tightening bolt 21 inserted into the bolt insertion hole 19 of the wedge member 15 is tightened and rotated in the bolt hole 9 of the clamp arm 3. Then, as shown in FIG. 10B, the tightening bolt 21 presses the wedge member 15 downward, and the wedge member 15 passes the first pressing surface 16 and the first receiving surface 13 of the transmission member 10, The clamp rod 2 is pressed into the mounting hole 6 of the clamp arm 3. As a result, the reaction force from the mounting hole 6 acts on the wedge member 15 through the clamp rod 2 and the transmission member 10, and the second pressing surface 17 of the wedge member 15 is the second of the accommodation hole 8 of the clamp arm 3. 2 Press the receiving surface 18. As a result, the clamp arm 3 is strongly fixed to the clamp rod 2.

The clamp arm 3 is removed from the clamp rod 2 in the following procedure.
First, in the state of FIG. 10B, by loosening and rotating the tightening bolt 21, the tightening bolt 21 raises the engaging portion 24 through the groove 22. Then, the engaging portion 24 abuts on the locking portion 20 of the wedge member 15 from the lower side. Subsequently, the screw driving force strongly presses the wedge member 15 through the engaging portion 24 of the tightening bolt 21 and the locking portion 20, and the wedge engagement of the wedge member 15 is released. Subsequently, when the tightening bolt 21 is loosened and rotated, the wedge member 15 is moved upward in the housing hole 8. Then, the wedge member 15 moves the transmission member 10 rightward along the guide groove 14 via the T leg 33 and the T groove 32. When the retaining ring 27 of the tightening bolt 21 abuts on the locking portion 28 formed in the peripheral portion of the bolt hole 9, the protrusion 12 of the transmission member 10 is pulled rightward from the groove 2a of the clamp rod 2 It has been released. Thereafter, the clamp arm 3 is removed upward from the clamp rod 2.

The fourth embodiment shown in FIG. 11 is different from the first embodiment described above in the following points.
As shown in FIG. 11, a flange portion 35 is protruded rightward from the lower end portion of the right wall of the transmission member 10. A through hole 36 is formed in the flange portion 35 in the vertical direction. When the transmission member 10 is inserted into the receiving hole 8 of the clamp arm 3 and temporarily assembled, the tightening bolt 21 is inserted into the bolt hole 9 through the through hole 36. The retaining ring 27 is attached to a mounting groove formed at the lower end portion of the tightening bolt 21. The retaining ring 27 is capable of abutting on a locking portion 28 formed on the periphery of the lower end portion of the bolt hole 8a. Therefore, when the tightening bolt 21 and the hook member 15 are lifted upward, the snap ring 27 of the tightening bolt 21 is received by the locking portion 28. Therefore, the clamping bolt 21 can be prevented from falling off the clamp arm 3, and the transmission member 10 and the wedge member 15 can be prevented from falling off the clamp arm 3.

The above embodiments can be modified as follows.
The recess 2 a may be a hole opened on the outer peripheral surface of the clamp rod 2 instead of the groove formed in the circumferential direction on the outer peripheral portion of the clamp rod 2.
Further, the cross-sectional shape of the concave portion 2a of the clamp rod 2 may be formed into another shape such as a circular arc shape or a triangle instead of being formed into a substantially quadrilateral shape.
The cross-sectional shape of the protrusion 12 may be formed into another shape such as an arc shape or a triangle instead of being formed into a substantially square shape.
The T-groove 32 may be formed in the wedge member 15 instead of being formed in the transmission member 10. In this case, the T-legs 33 may be formed on the transmission member 10 instead of being formed on the wedge member 15.

The first pressing surface 16 is formed on the left side of the wedge member 15 so as to be away from the axial center of the clamp rod 2 as it goes downward, and the second pressing surface 17 is placed on the right side of the wedge member 15 Although it was set as the structure formed in the up-down direction straight, it may replace with this and may be the structure of following (1) or (2).
(1) The first pressing surface 16 is formed straight on the left side of the wedge member 15 in the vertical direction, and the second pressing surface 17 is formed on the right side of the wedge member 15 in the above axial direction as it goes downward. It is formed to approach.
(2) The first pressing surface 16 is formed on the left side of the wedge member 15 so as to be away from the above-mentioned axis as it goes downward, and the second pressing surface 17 is formed on the right side of the wedge member 15 It is formed to approach the above-mentioned axis as it goes downward.
The pressing surfaces 16 and 17 and the receiving surfaces 13 and 18 may be formed in an arc shape in plan view instead of the configuration formed in a plane.
The protrusion 12 may be separately provided instead of being integrally formed with the transmission member 10.
Besides, it goes without saying that various modifications can be made as far as the person skilled in the art can conceive.

  1: Housing, 2: Clamp rod, 2a: Recess (groove), 3: Clamp arm, 3a: one end (left end), 3b: the other end (right end), 6: mounting hole, 8: accommodation hole, 8a: bottom, 9: bolt hole, 10: transmission member, 12: projection, 14: first guide groove (guide groove), 15: wedge member, 19: bolt insertion hole, 20: second locking portion (engagement) Stop portion), 21: Tightening bolt, 24: Second engagement portion (engagement ball), 26: first projection (pin), 27: first engagement portion (retaining ring), 28: first engagement Stop part (locking part), 29: second guide groove (guide groove), 31: second projection (pin), 32: T groove, 33: T leg, 35: flange part, 36: through hole.

Claims (7)

A clamp rod (2) movably inserted into a housing (1) between a distal end side and a proximal end side in the axial direction, the clamp rod (2) having a recess (2a) formed at its distal end )When,
A clamp arm (3) removably mounted on the clamp rod (2);
The mounting hole (6) axially penetrated in one end (3a) of the one end (3a) and the other end (3b) of the clamp arm (3);
An accommodation hole (8) formed so as to be adjacent to the other end (3b) side of the mounting hole (6) and opened toward the tip end side;
A transmission member (10) which is retained from the accommodation hole (8) so as to be movable in a direction intersecting the axial direction, the one end portion from the outer peripheral wall of the transmission member (10) 3a) A transmission member (10) having a projection (12) which is provided to project to the side and is inserted into the recess (2a);
A wedge member (15) which is formed to be tapered toward the proximal end, and which is attached to the receiving hole (8);
And a clamping bolt (21) mounted on the clamp arm (3), and fixed so as to be movable in the axial direction with respect to the clamp arm (3). Equipped
When the clamp arm (3) is attached to the clamp rod (2), the wedge member (15) is moved to the transmission member (10) by pressing the wedge member (15) to the base end side. While pressing the mounting hole (6) via the clamp rod (2), the wedge member (15) presses the accommodation hole (8).
An attaching / detaching device for a clamp arm of a clamp device characterized in that. In the clamp arm attachment / detachment device of the clamp device according to claim 1,
A first guide groove (14) is formed in a direction intersecting the axial direction on one of the inner peripheral wall of the accommodation hole (8) and the outer peripheral wall of the transmission member (10),
A first protrusion (26) protruding from the other of the inner peripheral wall of the housing hole (8) and the outer peripheral wall of the transmission member (10) is inserted into the first guide groove (14) ,
The transmission member (10) is movable along the first guide groove (14) by the first projection (26) in the accommodation hole (8) of the clamp arm (3).
The transmission member (10) is prevented from being pulled out from the accommodation hole (8) by the first projection (26) and the first guide groove (14).
An attaching / detaching device for a clamp arm of a clamp device characterized in that. The clamp arm attachment / detachment device of the clamp device according to claim 1 or 2
The tightening bolt (21) is screwed into a bolt hole (9) formed in the bottom (8a) of the housing hole (8),
A first locking portion (28) is formed at a peripheral edge portion on the proximal end side of the bolt hole (9),
A first engagement portion (27) facing the first engagement portion (28) so as to be contactable with a predetermined interval is formed at a proximal end of the tightening bolt (21).
The tightening bolt (21) is moved by moving the tightening bolt (21) to the tip end side so that the first engaging portion (27) abuts on the first locking portion (28). Retained to the clamp arm (3),
An attaching / detaching device for a clamp arm of a clamp device characterized in that. The clamp arm attachment / detachment apparatus according to any one of claims 1 to 3,
A bolt insertion hole (19) is formed in the wedge member (15), and the tightening bolt (21) inserted into the bolt insertion hole (19) is screwed into the bottom (8a) of the accommodation hole (8). Combined,
When removing the clamp arm (3) from the clamp rod (2), by loosening and rotating the tightening bolt (21), a second engagement provided at an intermediate height portion of the tightening bolt (21) The joint portion (24) presses the second locking portion (20) formed in the bolt insertion hole (19) toward the tip end side.
An attaching / detaching device for a clamp arm of a clamp device characterized in that. The clamp arm attachment / detachment device of the clamp device according to claim 4,
A second guide groove (29) is formed in the axial direction on one of the inner peripheral wall of the accommodation hole (8) and the outer peripheral wall of the wedge member (15),
A second protrusion (31) protruding from the other of the inner peripheral wall of the housing hole (8) and the outer peripheral wall of the wedge member (15) is inserted into the second guide groove (29) ,
The wedge member (15) is movable in the axial direction in the accommodation hole (8) via the second guide groove (29) and the second projection member (31),
The wedge member (15) is prevented from coming out of the accommodation hole (8) by the second guide groove (29) and the second projection member (31).
An attaching / detaching device for a clamp arm of a clamp device characterized in that. The clamp arm attachment / detachment apparatus according to any one of claims 1 to 5,
A T-groove (32) is formed along one of the outer peripheral wall of the transmission member (10) and the outer peripheral wall of the wedge member (15),
A T leg (33) protruding from the outer peripheral wall of the outer peripheral wall of the transmission member (10) and the outer peripheral wall of the wedge member (15) is inserted into the T groove (32).
An attaching / detaching device for a clamp arm of a clamp device characterized in that. In the clamp arm attachment / detachment device of the clamp device according to claim 1,
A flange portion (35) protrudes from the outer peripheral wall of the transmission member (10) toward the other end portion (3b),
A through hole (36) is formed in the flange portion (35) in the axial direction,
The tightening bolt (21) can be screwed through the through hole (36) to the bolt hole (9) formed in the bottom (8a) of the accommodation hole (8).
A first locking portion (28) is formed on the periphery of the proximal end side of the bolt hole (9).
A first engagement portion (27) facing the first engagement portion (28) so as to be contactable with a predetermined interval is formed at a proximal end of the tightening bolt (21).
The tightening bolt (21) is moved by moving the tightening bolt (21) to the tip end side so that the first engaging portion (27) abuts on the first locking portion (28). Retained to the clamp arm (3),
An attaching / detaching device for a clamp arm of a clamp device characterized in that.