JP6499529B2 - Clamping device - Google Patents

Description

  The present invention relates to a clamp device, and more particularly to a structure for attaching a clamp arm to a clamp rod of the clamp device.

Conventionally, this type of technology is disclosed in Patent Document 1 below. The prior art is configured as follows.
A tapered outer peripheral surface narrowed upward and a tightening male screw portion having a smaller diameter than the tapered outer peripheral surface are provided in the upper end portion of the clamp rod in order. A mounting taper hole that narrows upward is formed at one end of the clamp arm in the horizontal direction.
When attaching the clamp arm to the clamp rod, a nut is screwed into the tightening male screw part, and the taper outer surface of the clamp rod is formed by the screw thrust (tightening force) of the nut. Strongly taper engagement.

JP 2004-223640 A

In the above prior art, it is necessary to apply a large tightening torque to the nut in order to strongly taper-engage the taper hole for mounting the clamp arm with the taper outer peripheral surface of the clamp rod. Therefore, it takes time to attach the clamp arm to the clamp rod.
An object of the present invention is to improve the above-mentioned problems.

  In order to achieve the above object, according to the present invention, for example, as shown in FIGS. 1 to 11, the clamping device is configured as follows.

  The clamp device of the present invention includes a clamp rod 3 that is inserted into the housing 1 so as to be movable in the axial direction, and a clamp arm 4 that is detachably attached to the tip of the clamp rod 3. A locking portion 6 having a pressing surface 23 that moves away from the axial center toward the distal end of the clamp rod 3 is provided on the outer peripheral portion of the distal end of the clamp rod 3. A mounting hole 4 a formed in the clamp arm 4 is fitted on the outer periphery of the clamp rod 3. A locked portion 8 having a receiving surface 25 that approaches the axial center toward the proximal end side of the clamp rod 3 is provided in the mounting hole 4a. The clamped arm 8 is received by the driving force when the clamp rod 3 is driven to the proximal end side and the reaction force toward the distal end when the clamp arm 4 presses the object to be clamped. The pressing surface 23 of the locking portion 6 is wedge-engaged with the surface 25, whereby the clamp arm 4 is fixed to the distal end portion of the clamp rod 3.

The clamp device of the present invention has the following effects.
The clamp arm can be attached to the clamp rod by the driving force when the clamp rod is driven to the proximal end and the reaction force toward the distal end when the clamp arm presses the object to be clamped. It takes less time to install the arm. That is, the clamp arm can be easily attached to the clamp rod.

  In the clamp device of the present invention, it is preferable that a set of cylindrical divided locking pieces 6a and 6b having an arc shape in the end view is used as the locking portion 6. According to this configuration, a sufficient contact area between the receiving surface of the locked portion and the pressing surface of the locking portion can be ensured, so that the clamp arm can be firmly fixed to the clamp rod. Further, since the number of parts of the locking portion is small, it is easy to set the locking portion on the outer peripheral portion of the tip end portion of the clamp rod during the mounting operation.

  In the clamping device of the present invention, it is preferable that a cylindrical body 8 having a slit 29 extending in the axial direction is used as the locked portion 8. According to this configuration, the cylindrical body as the locked portion can be expanded in diameter, and the pressing surface of the locking portion can be strongly wedge-engaged with the receiving surface of the cylindrical body. The cylindrical body can be strongly adhered to the mounting hole.

It is preferable that the clamping device of the present invention further includes the following configuration.
A rod-side groove 3 c is formed in the axial direction on the outer peripheral portion of the distal end portion of the clamp rod 3. A first opening 24 and a second opening 30 are formed in the axial direction on the side surface of the locking portion 6 and the side surface of the locked portion 8, respectively. Further, an arm side groove 4b is formed in the axial direction on the inner peripheral surface of the mounting hole 4a. The pin 7 is fitted into the rod side groove 3c, the first opening 24, the second opening 30, and the arm side groove 4b.

  According to this configuration, the phase position of the clamp arm in the circumferential direction of the clamp rod can be determined by the pin. Further, after the clamp arm is attached to the clamp rod, the pin functions as a detent for the clamp arm.

It is preferable that the clamping device of the present invention further includes the following configuration.
A concave portion 3 d is formed on the outer peripheral portion of the distal end portion of the clamp rod 3. A first hole 38 and a second hole 40 are formed on the side surface of the locking portion 6 and the side surface of the locked portion 8, respectively. Further, a screw hole 4c penetrating outward is formed on the inner peripheral surface of the mounting hole 4a. The tip portions of the screw members 10 and 41 screwed into the screw holes 4c are sequentially inserted into the second hole 40, the first hole 38, and the recess 3d.

  According to this configuration, the phase position of the clamp arm in the circumferential direction of the clamp rod can be determined by the screw member. Moreover, after attaching a clamp arm to a clamp rod, the said screw member functions as a rotation prevention of a clamp arm and fall prevention.

It is preferable that the clamping device of the present invention further includes the following configuration.
An arm retaining member 9 is further provided so as to sandwich the clamp arm 4 fixed to the tip of the clamp rod 3. The first plate portion 43 on the base end side of the arm retaining member 9 is brought into contact with the base end surface of the clamp arm 4. Further, the second plate portion 44 on the distal end side of the arm retaining member 9 is brought into contact with the upper surface of the locking portion 6 or the distal end surface of the clamp rod 3. According to this configuration, the clamp arm can be reliably prevented from falling.

It is preferable that the clamping device of the present invention further includes the following configuration.
A protruding portion 20 that positions the locking portion 6 with respect to the clamp rod 3 is provided on the outer peripheral portion of the distal end portion of the clamp rod 3. According to this configuration, the locking portion can be easily positioned with respect to the clamp rod.

  According to the present invention, the clamp arm can be easily attached to the clamp rod.

FIG. 1 shows a first embodiment of the present invention and is a partial cross-sectional view of a clamp device in an elevation view. FIG. 2A is a side view of the set of cylindrical divided locking pieces shown in FIG. 1. 2B is a side view of the cylindrical body shown in FIG. 3A to 3C are perspective views for explaining the first half of the procedure for attaching the clamp arm to the clamp rod in FIG. 4A to 4C are perspective views for explaining the latter half of the above procedure. 5A and 5B are perspective views showing a procedure for attaching an arm retaining member to the clamp arm. FIG. 6 is a partial cross-sectional view showing a procedure for removing the clamp arm. FIG. 7 shows a second embodiment of the present invention and is a partial cross-sectional view in an elevational view of a clamp arm mounting portion of a clamp device. FIG. 8A is a side view of the set of cylindrical divided locking pieces shown in FIG. 7. FIG. 8B is a side view of the cylindrical body shown in FIG. 9A to 9C are perspective views for explaining the first half of the procedure for attaching the clamp arm to the clamp rod in FIG. 10A to 10C are perspective views for explaining the latter half of the above procedure. FIG. 11 shows a modification of the second embodiment of FIG. 7 and is similar to FIG.

(First embodiment)
1 to 6 show a first embodiment of the present invention. In this embodiment, the case where the clamp apparatus is applied to a turning clamp for fixing a workpiece is illustrated. First, the overall structure and operation of the swivel clamp will be described with reference to FIG.

  The housing 1 of the swivel clamp 100 is fixed to a table T as a fixed base by a plurality of bolts (not shown). A clamp rod 3 is inserted into the cylindrical hole 2 of the housing 1 so as to be movable up and down. A clamp arm 4 is detachably fixed to the upper end portion (tip portion) of the clamp rod 3 at a desired turning position, and a push bolt 5 is fixed to the tip portion of the arm 4.

The pivoting clamp 100 operates as follows.
In the state of FIG. 1, the pressure oil is supplied to the unclamping chamber 22 below the piston 15 connected to the clamp rod 3, and as a result, the clamp rod 3 is raised to the illustrated swivel retracted position. When the clamp 100 is switched to the clamped state, the pressure oil in the unclamp chamber 22 is discharged and the pressure oil is supplied to the clamp chamber 21 above the piston 15. Then, the clamp rod 3 is swung in the clockwise direction in plan view along the swivel groove 27 formed in the lower sliding portion 12 of the clamp rod 3 by the hydraulic pressure of the pressure oil supplied to the clamp chamber 21. Then, it descends straight along the rectilinear groove 28 on the upper side of the turning groove 27. Thereby, the clamp rod 3 switches to a clamp position (not shown).

  When the clamp rod 3 turns in the clockwise direction in a plan view, each engagement ball 26a fitted in the turning groove 27 rolls in a counterclockwise direction in the plan view. The sleeve 32 fitted on the ball 26a freely rotates in the counterclockwise direction.

  When the clamp 100 is switched from the clamped state to the swivel retracted state of FIG. 1, the pressure oil is discharged from the clamp chamber 21 and supplied to the unclamp chamber 22. Then, first, the piston 15 and the clamp rod 3 are raised straight along the rectilinear groove 28. Subsequently, the clamp rod 3 rises while turning counterclockwise in plan view along the turning groove 27, and the clamp rod 3 and the clamp arm 4 are switched to the turning retracted position of FIG.

  Next, the structure for attaching the clamp arm 4 to the clamp rod 3 will be described in detail with reference to FIGS. 1 to 4C.

  A groove 3b is provided on the outer periphery of the upper end of the clamp rod 3 over the entire periphery. In the groove 3b, a set of cylindrical divided locking pieces 6a, 6b having an arc shape in a plan view as the locking portion 6 are fitted. A rod-side groove 3c extending in the vertical direction by further recessing a part of the groove 3b is provided on the outer peripheral surface of the groove 3b, and a pin 7 is fitted into the rod-side groove 3c. A tapered pressing surface 23 is formed on the outer peripheral portion of the cylindrical divided locking pieces 6a, 6b so as to move away from the axis as it goes upward. Further, as shown mainly in FIG. 2A and the like, the first openings 24 and 24 into which the pins 7 are fitted are provided in the vertical direction on the outer peripheral surfaces of the two cylindrical divided locking pieces 6a and 6b facing each other. (Axial direction).

  A mounting hole 4 a that is externally fitted to the clamp rod 3 is provided at the left end of the clamp arm 4 in the horizontal direction. A portion of the mounting hole 4a excluding the lower end portion is further expanded in diameter, and the tubular body 8 as a locked portion is fitted into this portion (see FIG. 1). Further, an arm side groove 4b into which the pin 7 is fitted is provided at one place in the circumferential direction on the inner peripheral surface of the mounting hole 4a (see FIGS. 1 and 3A). The arm-side groove 4b has an arc shape in plan view and extends in the axial direction of the mounting hole 4a. A tapered receiving surface 25 is formed on the inner peripheral portion of the cylindrical body 8 so as to approach the axis as it goes downward. As shown mainly in FIG. 2B, a slit 29 extending in the vertical direction and a second opening 30 into which the pin 7 is fitted are formed at the same position in the circumferential direction on the peripheral wall of the cylindrical body 8.

  As shown in FIGS. 3A to 4C, the clamp arm 4 is attached to the clamp rod 3 in the following procedure.

  First, the clamp arm 4 is extrapolated to the clamp rod 3 from above (FIG. 3A → FIG. 3B). Next, the cylindrical body 8 is inserted into the annular gap between the outer peripheral surface of the clamp rod 3 and the mounting hole 4a of the clamp arm 4 from above (FIG. 3B → FIG. 3C). Subsequently, the pin 7 is fitted from the side into the rod side groove 3c at the upper end of the clamp rod 3 (FIG. 3C → FIG. 4A), and the cylindrical divided locking pieces 6a, 6b are laterally inserted into the groove 3b of the clamp rod 3. (Fig. 4A-> Fig. 4B). At this time, the first openings 24 of the cylindrical divided locking pieces 6 a and 6 b are aligned with the pins 7. Thereafter, the clamp arm 4 is lifted so that the arm-side groove 4b of the clamp arm 4 is fitted to the pin 7 (FIG. 4B → FIG. 4C), and the receiving surface 25 of the cylindrical body 8 is formed into a cylindrical divided locking piece. Lightly wedge-engaged (temporarily fixed) to the pressing portions 23 of 6a and 6b. Thereafter, the clamp rod 3 is driven downward. Then, the push bolt 5 of the clamp arm 4 presses a clamp target (not shown) such as a workpiece, a die, or a dummy block from above. As a result, the cylinder is divided and locked to the receiving surface 25 of the cylindrical body 8 by the downward driving force (hydraulic pressure) for driving the clamp rod 3 and the upward reaction force transmitted from the object to be clamped to the clamp arm. The pressing surfaces 23 of the pieces 6a and 6b are strongly wedge-engaged (finally fixed), and the cylindrical body 8 is expanded in diameter to be firmly attached to the mounting hole 4a. As a result, the clamp arm 4 is attached (fixed) to the upper end portion of the clamp rod 3.

  Here, as shown in FIGS. 5A and 5B, it is preferable to attach an arm retaining member 9 to prevent the clamp arm 4 attached to the clamp rod 3 from dropping. The arm retaining member 9 is formed by bending a plate member. The arm retaining member 9 includes a base portion 42 extending in the vertical direction, and a first portion extending in the horizontal direction at an angle of about 90 ° from the lower end and the upper end of the base portion 42. The plate portion 43 and the second plate portion 44 are configured. The lower first plate portion 43 is provided with an arcuate contact portion 43a having a shape matched to the outer shape of the clamp rod 3, and the upper second plate portion 44 is provided with the outer shape of the distal end portion of the clamp rod 3. A U-shaped abutting portion 44a having a shape matched to the shape is provided. In addition, the 1st board part 43 and / or the 2nd board part 44 are bent slightly inward rather than 90 degree | times with respect to the base 42 so that an elastic force may be exhibited.

The arm retaining member 9 is attached to the clamp arm 4 in the following procedure.
First, the arm retaining member 9 is mounted from the side so as to sandwich the clamp arm 4 attached to the upper end of the clamp rod 3 (FIG. 5A → FIG. 5B). Thereby, said 1st board part 43 contact | abuts to the lower surface of the clamp arm 4, and said 2nd board part 44 contact | abuts to the upper surface of the cylindrical division | segmentation locking pieces 6a and 6b. For this reason, even when a downward external force acts on the clamp arm 4 attached to the clamp rod 3 for some reason, the external force is transmitted through the second plate portion 44 and the cylindrical divided locking pieces 6a and 6b. Since it is received by the lower wall of the groove 3b of the clamp rod 3, the clamp arm 4 will not fall. Further, the elastic force of the first plate portion 43 and the second plate portion 44 prevents the arm locking member 9 from coming off from the clamp arm 4 to the side. When removing the arm retaining member 9, the claw portion 44b provided at the tip of the second plate portion 44 is lifted upward, and then the arm retaining member 9 is moved sideways to prevent the arm retaining member from the clamp arm 4. The member 9 is removed.

  The procedure for removing the clamp arm 4 from the clamp rod 3 will be described with reference to FIG. First, the removal tool 34 having a circular shape in plan view is placed on the upper surface of the clamp arm 4 so as to cover the upper end portion of the clamp rod 3. At this time, the lower end surface of the removal tool 34 is applied to the upper surface of the cylindrical body 8. Next, the bolt 37 is inserted into the screw insertion hole 34 a of the removal tool 34. Subsequently, the bolt 37 is screwed into the screw hole 3 f provided at the tip of the clamp rod 3. Then, the clamp arm 4 and the cylindrical body 8 are pushed downward with respect to the clamp rod 3, and the wedge engagement between the receiving surface 25 of the cylindrical body 8 and the pressing surface 23 of the cylindrical divided locking pieces 6a and 6b. The match is released. Thereby, the clamp arm 4 is easily removed from the clamp rod 3.

(Second Embodiment)
7 to 10C show a second embodiment of the present invention. In this embodiment, the same members (or similar members) as the constituent members of the first embodiment are described with the same reference numerals in principle.

This second embodiment differs from the first embodiment in the following points.
In the second embodiment, an index plunger 10 as a screw member is used instead of the pin 7 in the first embodiment shown in FIG. The index plunger 10 is a known part and has a structure that allows the pin portion 10b to advance and retract in the horizontal direction with respect to the screw portion 10a of the plunger case. In the second embodiment, the pin 20 is used for positioning the cylindrical divided locking pieces 6 a and 6 b with respect to the clamp rod 3. Specific examples of the pin 20 include a spring pin and a parallel pin. In the first embodiment, the pin 7 plays a role in positioning the cylindrical divided locking pieces 6 a and 6 b with respect to the clamp rod 3.

  A hole 3d as a recess is provided on the outer peripheral surface of the groove 3b provided at the upper end portion of the clamp rod 3, and the pin portion 10b of the index plunger 10 is inserted into the hole 3d. A hole 3e into which the pin 20 is fitted is provided on the surface of the outer peripheral surface of the groove 3b opposite to the hole 3d. As shown mainly in FIG. 8A, a substantially semicircular opening 38 into which the pin portion 10b is inserted is formed on one lower outer peripheral surface of the portion of the two cylindrical divided locking pieces 6a and 6b facing each other. It is formed. In the second embodiment, the first hole is formed by the two opening portions 38 and 38 facing each other. In addition, a substantially semicircular opening 39 into which the pin 20 is engaged is formed on the other lower outer peripheral surface of the portion facing each other.

  As shown mainly in FIG. 8B, a slit 29 extending in the vertical direction and a second hole 40 into which the pin portion 10b of the index plunger 10 is inserted are formed at the same position in the circumferential direction on the peripheral wall of the cylindrical body 8. ing.

  Further, a screw hole 4c penetrating outward is formed on the inner peripheral surface of the mounting hole 4a provided in the clamp arm 4, and the screw portion 10a of the index plunger 10 is screwed into the screw hole 4c. The

  As shown in FIGS. 9A to 10C, the clamp arm 4 is attached to the clamp rod 3 in the following procedure.

  First, the threaded portion 10a of the index plunger 10 is screwed into the screw hole 4c of the clamp arm 4, the index plunger 10 is attached to the clamp arm 4, and the pin 20 is fitted into the hole 3e provided in the groove 3b of the clamp rod 3. (FIG. 9A → FIG. 9B). At this time, the pin portion 10b (tip portion) of the index plunger 10 is in a state of being retracted rearward. Further, by fitting the pin 20 into the hole 3e, the pin 20 becomes a protrusion that determines the positions of the cylindrical divided locking pieces 6a and 6b with respect to the clamp rod 3. Next, the clamp arm 4 is extrapolated to the clamp rod 3 from above (FIG. 9B → FIG. 9C). Subsequently, the cylindrical body 8 is inserted into the annular gap between the outer peripheral surface of the clamp rod 3 and the mounting hole 4a of the clamp arm 4 from above (FIG. 9C → FIG. 10A). At this time, the cylindrical body 8 is inserted while adjusting so that the center of the second hole 40 of the cylindrical body 8 and the center of the screw hole 4c formed in the clamp arm 4 coincide. Further, the cylindrical divided locking pieces 6a, 6b are applied to the pin 20 (see FIG. 7) while the cylindrical divided locking pieces 6a, 6b are applied to the groove 3b of the clamp rod 3 from the side. Fit (FIG. 10A → FIG. 10B).

Thereafter, as shown in FIGS. 10B to 10C, the clamp arm 4 is lifted, and the pressing surface 23 of the cylindrical divided locking pieces 6 a and 6 b is lightly applied to the receiving surface 25 of the cylindrical body 8 to be in a temporarily fixed state. In this temporarily fixed state, the pin portion 10b of the index plunger 10 is temporarily advanced to confirm that the pin portion 10b has reached the hole 3d (see FIG. 7). If the pin portion 10b does not reach the hole 3d, the screw arm 4c, the second hole 40, and the two opening portions 38 (first hole) are adjusted by finely adjusting the turning angle of the clamp arm 4 or the like. Perform alignment. Further, if it can be confirmed that the pin portion 10b has reached the hole 3d, the clamp rod 3 is driven downward with the pin portion 10b advanced. Then, the receiving surface 25 of the cylindrical body 8 has a cylindrical shape due to the downward driving force (hydraulic pressure) that drives the clamp rod 3 and the upward reaction force when the clamp arm 4 presses the object to be clamped. While the pressing surfaces 23 of the divided locking pieces 6a and 6b are strongly wedge-engaged, the cylindrical body 8 is expanded in diameter and is firmly attached to the mounting hole 4a. Accordingly, the clamp arm 4 is attached (fixed) to the upper end portion of the clamp rod 3.
Further, after the clamp arm 4 is attached to the clamp rod 3, the index plunger 10 functions to prevent the clamp arm 4 from rotating and to prevent it from dropping.

(Modification)
Each of the embodiments described above can be modified as follows.
As shown in FIG. 11, the screw member may be a bolt 41 including a pin portion 41 b and a screw portion 41 a in order from the tip side instead of the index plunger 10 described above. In this case, the clamp arm 4 is positioned and adjusted with respect to the clamp rod 3 so that the pin portion 41b coincides with the hole 3d at the stage of temporarily fixing the clamp arm 4 to the clamp rod 3. Next, the bolt 41 is screwed into the screw hole 4c of the clamp arm 4, and the pin portion 41b is inserted into the hole 3d. Finally, the clamp rod 3 is lowered and the clamp arm 4 is pressed against the object to be clamped. As a result, a cylinder is formed on the receiving surface 25 of the cylindrical body 8 by the downward driving force (hydraulic pressure) for driving the clamp rod 3 and the upward reaction force when the clamp arm 4 presses the object to be clamped. The pressing surfaces 23 of the divided split locking pieces 6a and 6b are strongly wedge-engaged, and the cylindrical body 8 is expanded in diameter and is firmly attached to the mounting hole 4a (main locking). As a result, the clamp arm 4 is attached (fixed) to the upper end portion of the clamp rod 3.

  5A and 5B, the lower surface of the upper second plate portion 44 is replaced with the upper surface of the cylindrical divided locking pieces 6a, 6b, instead of the clamp rod 3 You may make it contact | abut on the upper surface of an upper end.

  In each of the above-described embodiments, the cylindrical divided locking pieces 6a and 6b as the locking parts and the cylindrical body 8 as the locked parts are all separate parts from the clamp rod 3 and the clamp arm 4. It is said that. However, when using the cylindrical divided locking pieces 6 a and 6 b that are separate from the clamp rod 3, the locked portion may be integrated with the clamp arm 4. Further, when using a cylindrical body 8 that is separate from the clamp arm 4, the locking portion may be integrated with the clamp rod 3. That is, at least one of the locking portion and the locked portion may be a separate body.

  Moreover, you may comprise a latching | locking part with 3 or more number of latching pieces instead of one set of division | segmentation latching pieces 6a and 6b. The same applies to the cylindrical body 8 as the locked portion, and the locked portion may be configured by two or more members. In addition, the pressing surface 23 of the locked portion 8 is configured to be formed in a planar shape or a curved surface in a part of the inner peripheral hole instead of a configuration in which the entire inner peripheral hole of the clamp arm is tapered. May be. In this case, the receiving surface 25 of the locking portion 6 may be configured to be formed as a flat surface or a curved surface at a part of the entire circumference instead of being configured to be tapered on the entire circumference of the clamp rod 3. Good.

  As a pressure fluid for operating the clamp rod 3, compressed air may be used in place of the illustrated pressure oil. Further, the clamp rod 3 may be operated electrically.

  The clamp arm 4 described above is attached to the clamp rod 3 at its end, but may be structured to be attached to the clamp rod 3 at a more central portion instead of the end of the clamp arm.

  In 1st Embodiment shown to FIG. 2A etc., although the 1st opening part 24 in which the pin 7 fits is formed in each of the division | segmentation locking pieces 6a and 6b, it replaces with this and one 1st opening part is substituted. You may form only in any one of the two division | segmentation locking pieces 6a and 6b. In this case, prior to fitting the pin 7 into the rod side groove 3c of the clamp rod 3, the tubular divided locking piece formed with the first opening is fitted into the groove 3b of the clamp rod 3 from the side. Just put it in.

  In the cylindrical body 8 of the first embodiment shown in FIG. 2B and the like, the slit 29 and the second opening 30 are formed at the same position in the circumferential direction, but instead of this, a position separated in the circumferential direction. You may form in. In this case, a slit is formed from the upper end to the lower end of the cylindrical body 8 in the axial direction.

In the second embodiment shown in FIG. 8A and the like, the first opening 38 into which the pin portion 10b of the index plunger 10 is fitted is formed in each of the division locking pieces 6a and 6b. The opening may be formed in only one of the two divided locking pieces 6a and 6b.
In addition, an opening 39 into which the pin 20 is fitted is formed in each of the divided locking pieces 6a and 6b, but instead of this, one opening is formed on either of the two divided locking pieces 6a and 6b. You may form only in either. In this case, prior to fitting the pin 20 into the hole 3e of the clamp rod 3, the divided locking pieces 6a and 6b having the holes 39 to be engaged with the pin 20 are fitted into the groove 3b of the clamp rod 3 from the side. Just put it in.

  In the cylindrical body 8 of the second embodiment shown in FIG. 8B and the like, the slit 29 and the second hole 40 are formed at the same position in the circumferential direction, but instead, at a position separated in the circumferential direction. It may be formed.

  In addition, it is needless to say that various modifications can be made within a range that can be assumed by those skilled in the art.

1: Housing, 3: Clamp rod, 3c: Rod side groove, 3d: Hole (recess) 4: Clamp arm, 4a: Mounting hole, 4b: Arm side groove, 4c: Screw hole, 6: Locking part, 6a, 6b: Cylindrical divided locking piece, 7: pin, 8: cylindrical body (locked portion), 9: arm locking member, 10: index plunger (screw member), 20: pin (projection), 23: pressing Surface, 24: first opening, 25: receiving surface, 29: slit, 30: second opening, 38: opening (the first hole is composed of two openings), 40: second hole, 41: Bolt (screw member) 43: first plate portion, 44: second plate portion, 100: swivel clamp (clamp device).

Claims (7)

A clamp device comprising: a clamp rod (3) inserted into a housing (1) so as to be movable in an axial direction; and a clamp arm (4) detachably attached to a distal end portion of the clamp rod (3).
A locking portion (6) provided on the outer peripheral portion of the distal end portion of the clamp rod (3), the locking portion (6) having a pressing surface (23) that moves away from the axis toward the distal end direction of the clamp rod (3). Part (6),
A mounting hole (4a) formed in the clamp arm (4) so as to be fitted on the outer periphery of the clamp rod (3);
A locked portion (8) provided in the mounting hole (4a), the locked portion (8) having a receiving surface (25) that approaches the axial center toward the proximal end side of the clamp rod (3). )When,
With
Due to the driving force when the clamp rod (3) is driven to the proximal end side and the reaction force to the distal end side when the clamp arm (4) presses the object to be clamped. The pressing surface (23) of the locking portion (6) is wedge-engaged with the receiving surface (25) of the locked portion (8), whereby the clamp portion (6) is clamped at the tip portion of the clamp rod (3). The arm (4) is fixed,
A clamping device characterized by that. The clamping device according to claim 1, wherein
The locking portion (6) is a pair of cylindrical divided locking pieces (6a, 6b) having an arc shape in an end view.
A clamping device characterized by that. The clamping device according to claim 1 or 2,
The locked portion (8) is a cylindrical body (8) having a slit (29) extending in the axial direction.
A clamping device characterized by that. The clamping device according to any one of claims 1 to 3,
A rod side groove (3c) is formed in the axial direction on the outer periphery of the tip of the clamp rod (3),
A first opening (24) is formed in the axial direction on the side surface of the locking portion (6),
A second opening (30) is formed in the axial direction on the side surface of the locked portion (8),
Arm side grooves (4b) are formed in the axial direction on the inner peripheral surface of the mounting hole (4a),
A pin (7) fitted into the rod side groove (3c), the first opening (24), the second opening (30), and the arm side groove (4b);
A clamping device characterized by that. The clamping device according to any one of claims 1 to 3,
A recess (3d) is formed on the outer periphery of the tip of the clamp rod (3),
A first hole (38) is formed on a side surface of the locking portion (6),
A second hole (40) is formed in the side surface of the locked portion (8),
A screw hole (4c) penetrating outward is formed on the inner peripheral surface of the mounting hole (4a),
Screw members (10, 41) screwed into the screw holes (4c), and tip portions are inserted into the second holes (40), the first holes (38), and the recesses (3d). A screw member (10, 41);
A clamping device characterized by that. The clamping device according to any one of claims 1 to 5,
An arm retaining member (9) mounted so as to sandwich the clamp arm (4) fixed to the tip of the clamp rod (3);
The first plate portion (43) on the proximal end side of the arm retaining member (9) is in contact with the proximal end surface of the clamp arm (4), and the first plate portion (43) on the distal end side of the arm retaining member (9). Two plate portions (44) are brought into contact with the distal end surface of the locking portion (6) or the distal end surface of the clamp rod (3).
A clamping device characterized by that. The clamping device according to any one of claims 1 to 6,
A protrusion (20) for positioning the locking portion (6) with respect to the clamp rod (3) is provided on the outer peripheral portion of the distal end portion of the clamp rod (3).
A clamping device characterized by that.

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