JPH0448903Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a clamping device that clamps a workpiece on a base with a clamp claw.

[Conventional technology]

Conventionally, "pine needle type clamp jig" Uses both hands.

You have to adjust the position (tightening) with one hand, support it as it is, and then tighten it with the other hand, which is cumbersome.

Particularly when the workpiece is in an upright position, the above operations are difficult.

In the case of complex-shaped workpieces, the number of man-hours required for mounting and dismounting increases, while the working posture also becomes poor, often causing back pain.

There is a problem.

The pine needle type clamping device shown in FIGS. 6 and 7, devised as an improved version of this "pine needle type clamp jig," has a threaded portion 15 at one end of the screw shaft 15.
A is screwed into the base 3, and the free end 16b of the support pin 16, which is screwed into the base 3 by a screw 16a, is adapted to be inserted into the recess 14 of the clamp claw 1'.

An eccentric bush 18 provided with a groove 17 is rotatably fitted into the clamp claw 1', and a stopper pin 19 is screwed onto the clamp claw 1'.
It is adapted to be engaged with the groove 17 of the eccentric bush 18.

Then, the eccentric hole 180 of the eccentric bushing 18 is press-fitted from the threaded portion 15b at the other end of the threaded shaft 15 to form the eccentric bushing 18 integrally with the threaded shaft 15, and the threaded portion 15b at the other end of the threaded shaft 15 is integrally formed with the eccentric bushing 18. A tightening lever 20 is screwed on.

Further, the eccentric bush 18 is provided with a ball 21 that slightly protrudes toward the tightening lever 20, and the tightening lever 20 has a recess 22 that selectively fits into the ball 21. A plurality of them are arranged on concentric circles centered on .

Further, on the eccentric bush 18 and base 3 side,
A spring 24 is fitted between the screw shaft 15 and a nut 23 screwed onto the screw shaft 15.

The tightening lever 20 of the clamping device configured in this way is moved from the state shown by the solid line in FIG. 6 to the seventh position.
When rotated as shown by the chain line in the figure, the screw shaft 15
By means of the eccentric bushing 18 integrally formed with the clamping lever 18, the clamp pawl 1' shown in solid lines is moved in the direction of arrow A as shown in chain lines, and the groove 17 of the eccentric bushing 18 and the stopper pin 19 of the tightening lever 20 are connected to each other. As a result of the engagement, as shown in FIG. 6, the clamp claw 1' shown by the solid line is pushed down in the direction of the arrow B to the position shown by the chain line, so that the workpiece W is clamped and held on the base 3 with a constant clamping force. It's getting old.

[Problem that the invention attempts to solve]

However, in the case of FIGS. 6 and 7, the tip 1a of the clamp claw 1' moves in a circular motion and moves forward in the direction of the arrow A, so that the workpiece W is clamped shallowly, and the workpiece W has a protrusion etc. If there is, the clamp claw 1' may not advance to the predetermined forward end in the direction of arrow A and may not be clamped.

Furthermore, since the clamping device has a large number of components and a complicated shape, the manufacturing cost of the clamping device is high.

Further, since the amount of movement of the clamp claw 1' is limited by the amount of eccentricity of the eccentric bush 18, the eccentric bush method is not suitable when a long amount of movement is required.

Therefore, in order to solve such problems, the present invention aims to reliably clamp and hold a workpiece by providing a clamping device in which the clamp claw moves linearly toward the workpiece.

[Means for solving problems]

Therefore, this invention solves the above-mentioned problem by providing an engaging groove in the clamp pawl, and on the other hand, engaging the protrusion provided on the ring that is inserted into the tightening bolt with the engaging groove in the clamp pawl. This problem is solved by using an O-ring fitted in the part, which rotates together with the tightening bolt to move the clamp claw towards the workpiece and away from the workpiece.

More specifically, referring to the reference numerals in FIGS. 1 and 2, the workpiece W on the base 3 is
In a clamp device that clamps with a clamp claw 1 provided on a base 3, a tightening bolt 4 screwed onto a base 3, a clamp claw 1 provided with an engagement groove 10, and an engagement groove 10 of this clamp claw 1. a ring 6 that is inserted into the tightening bolt 4 and has a protrusion 9 that is engaged with the tightening bolt 4;
Alternatively, it is made of an O-ring-like elastic body, and when the tightening bolt 4 is rotated, the ring 6 rotates together with the tightening bolt 4 due to the O-ring 5 fitted to the inner diameter of the ring 6. , so that the protrusion 9 of the ring 6 engages with the engagement groove 10 of the clamp claw 1 to move the clamp claw 1 toward the workpiece W or to move the clamp claw 1 in a direction away from the workpiece W. This is what I did.

[Effect]

According to the above-mentioned means, when the tightening bolt 4 is rotated, the ring 6 moves together with the tightening bolt 4 due to the O-ring 5 fitted on the inner diameter part of the ring 6, and the protrusion 9 of the ring 6 is moved. It acts on the engagement groove 10 of the clamp claw 1 and moves the clamp claw 1 in the direction of arrow A or C.
move in the direction.

After the clamp claw 1 moves in the direction of arrow A, when the tightening bolt 4 is further tightened, the ring 6
The O-ring 5 causes slippage between the clamping bolt 4 and the clamping bolt 4, and the tip 1a of the clamp claw 1 is firmly clamped to the workpiece W set on the base 3.

〔Example〕

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

The drawings from FIG. 1 to FIG. 3 show a first embodiment of the invention, and as can be seen from FIG. A long hole 2 is provided in the clamp claw 1, and a tightening bolt 4 having a threaded portion 4a fastened to a base 3 is inserted through the long hole 2 of the clamp claw 1.

Furthermore, as can be seen from FIG.
A ring 6 fitted with an O-ring (which may be an elastic body like an O-ring) and a retaining ring 7 are inserted, and the retaining ring 7 bulges toward the tightening bolt 4 and the tightening bolt 4. The ring 6 is fixed to the tightening bolt 4 by a set screw 8 between the ring 6 and the base 3 to prevent the ring 6 from falling in the direction of arrow B in FIG. 1 due to slipping of a certain O-ring 5. A protrusion 9 such as a pin is press-fitted into the ring 6 so as to protrude toward the clamp claw 1.
The engagement groove 10 that engages with the protrusion 9 forms an angle with the elongated hole 2 (orthogonal to the elongated hole 2 in the illustration in FIG. 2).
It is provided.

Further, a threaded portion 11a of a support bolt 11, which is a support member, is tightened on the base 3, and a nut 12 that fixes the height adjustment position of the support bolt 11 is tightened.
is screwed into the threaded portion 11a, and a hexagonal hole 13 is provided in the head 11b of the support bolt 11, and a hexagonal turning tool (not shown) is inserted into this hexagonal hole 13. Support bolt 1
By rotating the support bolt 11, the height of the support bolt 11 can be adjusted.

The head 11b of the support bolt 11 is adapted to engage with a recess 14 provided on the base 3 side of the clamp claw 1.

Then, when a hexagonal turning tool (not shown) is inserted into the hexagonal hole 13 provided in the head 4b of the tightening bolt 4 and the tightening bolt 4 is rotated, an O
The ring 6 fitted with the ring 5 is the tightening bolt 4
While the protrusion 9 of the ring 6 moves in the engagement groove 10 of the clamp claw 1, the clamp claw 1 is moved from the position shown by the chain line in FIGS. 1 and 2 to the position shown by the solid line in the direction of arrow A. Move forward toward the workpiece W.

At this time, the head 11b of the support bolt 11 is engaged with the recess 14 of the clamp claw 1, and the clamp claw 1 is moved forward toward the workpiece W in the direction of arrow A. When moving away from the workpiece W in the direction of arrow C, the second
In addition to preventing the clamp claw 1 from rotating around the tightening bolt 4 in the directions of arrows D and E shown in the figure, the support bolt 11 serves as a fulcrum when tightening the tightening bolt 4, and the tightening rotation of the tightening bolt 4 is prevented. Due to the movement, the tip 1a of the clamp claw 1 is pushed down in the direction of arrow B,
It serves to apply a constant tightening force to the workpiece W.

In other words, when the clamp claw 1 shown by the chain line moves forward in the direction of the arrow A toward the workpiece W as shown by the solid line, and the tightening bolt 4 is further tightened, the gap between the tightening bolt 4 and the ring 6 is It begins to slide by the O-ring 5, and the tip 1a of the clamp claw 1 moves down in the direction of arrow B in FIG. It is firmly tightened and fixed to the workpiece W.

FIG. 4 shows the second type of this invention, which shows a type in which two workpieces W, W are fixed close to each other on the base 3.
The first embodiment shown in FIG.
The difference from the embodiment is that in order to clamp two workpieces W and W at the same time, the clamp shape is triangular as the clamp claw 100, and the workpiece W fixed to the base 3 is round. Those 2
A curved concave portion corresponding to the round shape of the workpiece W is provided at the tip portions 1a, 1a of the clamp claw 100 for simultaneously tightening and fixing the workpieces W.

Since the other configurations and operations are the same as those in the first embodiment, the same reference numerals as in the first embodiment are given, and the explanation thereof will be omitted.

FIG. 5 shows a third embodiment of this invention. In this third embodiment, a double-opening type clamping device is provided between two workpieces W, W, and one of the double-opening type clamping devices is provided between two workpieces W, W. By rotating the tightening bolt 4, the two clamp claws 20 shown in chain lines
0 and 200 are moved from the clamp guide 201 formed in a square shape toward the workpieces W and W as shown by solid lines, and further tighten the tightening bolt 4, the round of the workpiece W is moved. Tips 1a, 1a of clamp claws 200, 200 brought into contact with the mold body
The workpieces W, W are firmly tightened and fixed onto the base 3.

Since the other configurations and operations are the same as those in the first embodiment, the same reference numerals as in the first embodiment are given, and the explanation thereof will be omitted.

[Effect of idea]

As mentioned above, when the tightening bolt is rotated, the ring is rotated together with the tightening bolt due to the O-ring fitted in the inner diameter of the ring, and the protrusion provided on the ring is rotated. By engaging the engagement groove of the clamp claw and moving the clamp claw toward the workpiece and away from the workpiece, the parts can be manufactured easily, and the manufacturing cost of the clamp device can be reduced, making it inexpensive. In addition, due to its versatility, it is possible to reduce the time required for attaching and detaching the workpiece, and furthermore, it is possible to set the moving amount of the clamp claw for a long time.

[Brief explanation of drawings]

The drawings from Fig. 1 to Fig. 3 show the first embodiment of this invention, in which Fig. 1 is a partially cutaway side view, Fig. 2 is a plan view, and Fig. 3 is the first embodiment of the invention. 4 is a plan view of a triangular clamp claw showing a second embodiment of the invention, and FIG. 5 is a plan view of a triangular clamp claw showing a second embodiment of the invention. A plan view showing the third embodiment of the invention, and FIGS. 6 and 7 show the conventional example. FIG. 6 is a side view equivalent to FIG. 1, and FIG. 7 is a plan view equivalent to FIG. 2. be. 1... Clamp claw, 3... Base, 4... Tightening bolt, 5... O-ring, 6... Ring, 9...
Projection, 10... Engagement groove, W... Workpiece.

Claims (1)

[Scope of utility model registration request] In a clamp device that clamps a workpiece on a base with a clamp claw provided on the base,
A tightening bolt screwed onto a base, a clamp claw provided with an engagement groove, and a ring that is inserted into the tightening bolt and includes a protrusion that engages with the engagement groove of the clamp claw; It consists of an O-ring or an O-ring-like elastic body that is fitted into the inner diameter of the ring and bulges out toward the tightening bolt, and when the tightening bolt is rotated, it is fitted into the inner diameter of the ring. When the O-ring rotates together with the tightening bolt, the protrusion of the ring engages the engagement groove of the clamp claw and moves the clamp claw toward the workpiece, or moves the clamp claw toward the workpiece. A clamping device characterized by moving in a direction away from.