JPS6121780B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a clamping device for clamping a work onto a mounting board such as a pallet or a jig stand.

Conventionally, in this type of device, when a clamp bolt screwed onto a mounting board is tightened, the clamp arm engaged with the bolt is first moved from a standby position on the side of the workpiece to an operating position facing the clamping part of the workpiece. The configuration is such that the clamp arm is rotated and then moved downward to the clamping point, but depending on the shape of the clamping point of the workpiece, the arrangement of the jig on the mounting board, etc. Turning from the standby position may be restricted and the clamp device may become unusable.

An object of the present invention is to provide a device that eliminates such inconveniences, and includes a clamp bolt that is screwed onto a mounting board, and a clamp bolt that is inserted into the bolt and tightened to tighten the clamp bolt onto the mounting board. a clamp arm that clamps a workpiece at one end, the clamp arm is fitted into the clamp bolt through a long hole in the middle thereof so as to be movable in the horizontal direction, and the clamp arm is fitted into the clamp bolt through a long hole in the middle thereof, and through a guide groove at the other end. The present invention is characterized in that a crank connected to the clamp bolt is engaged with a guide pin implanted on the mounting board, and further engaged with an engagement portion provided on the lower surface of the guide pin via a torque limiter mechanism.

Next, the present invention will be explained with reference to the illustrated embodiments.

The embodiment shown in FIGS. 1 to 4 is applied to a workpiece w having a clamping point a in a recess on the side surface, and is mounted on a mounting board 1 such as a pallet or a jig stand on which the workpiece w is placed. A clamp bolt 3 is screwed into the holder 2 attached to this, and a clamp arm 4 extending horizontally back and forth is loosely fitted into the bolt 3 through a long hole 5 formed in the front and rear direction so as to be movable horizontally. Furthermore, the arm 4 has a guide groove 7 extending in the front-rear direction on the lower surface of the rear end that engages with a guide pin 6 implanted in the mounting board 1, and a guide groove 7 extending in the front-rear direction on the lower surface of the rear end, and a guide groove 7 extending in the front-rear direction on the lower surface of the rear end, which engages with a guide pin 6 implanted in the mounting board 1.
An engaging portion 9 is formed on the lower surface of the arm 4 to engage with the crank 8 loosely fitted therein.

The engaging portion 9 includes a pair of protrusions 9a and 9 protruding from each side of the arm 4 with a gap in the front and rear directions.
The tip of the crank 8 was inserted between the protrusions 9a and 9b on one side in accordance with the thread direction of the bolt 3.

The crank 8 is connected to the bolt 3 via a torque limiter mechanism 10, which is illustrated in more detail. and a lower second serration ring 12 that engages with the second serration ring 12, and the second serration ring 12 is engaged with the bolt 3 so as to be freely movable downward against a spring 13.

In the drawings, reference numeral 14 denotes a cross pin 1 that engages the second serration ring 12 with the bolt 3 to prevent rotation.
5 shows a piece attached to the lower surface of the front end of the clamp arm 4.

Next, to explain its operation, when the clamp bolt 3 is relaxed, the clamp arm 4 is in a rear standby position as shown by the dotted line in FIG. 2 and FIG. Set it on the mounting base 1.

Next, the bolt 3 is tightened, and as a result, the crank 8 is rotated via the torque limiter mechanism 10, and this abuts the front projection 9a of the engaging portion 9, causing the clamp arm 4 to tighten the crank 8. However, at this time, the movement direction of the arm 4 is regulated by the engagement between the guide pin 6 and the guide groove 7, so that the arm 4 is forced to move in the guide groove 7 as shown in FIG. 3a.
The front end of the workpiece W is inserted into the recess of the workpiece W.

Next, the front end of the arm 4 moves forward to a predetermined operating position facing the clamping point a of the work W as shown by the solid line in FIG. 2, and when its forward movement is restrained by the work W, the torque limiter mechanism 10 is formed. The second serration ring 12 resists the spring 13 and escapes downward due to the taper of the occlusal surface with the first serration ring 11, and the transmission of torque from the clamp bolt 3 to the crank 8 is cut off. With the tightening operation of step 3, the arm 4 is attached to the guide pin 6.
The workpiece W is moved downward using the workpiece W as a fulcrum, and the contact piece 15 at the front end is pressed against the clamping point a, thereby clamping the workpiece W.

As above, move the clamp arm 4 from the standby position to the workpiece W.
Although an embodiment has been described in which the clamp is moved straight to the operating position facing the clamp point a, the present invention is not limited to this. For example, as shown in FIG. When the straight movement of the arm 4 is obstructed by the presence of an obstacle 16, the guide groove 7 is curved so that the clamp arm 4 can be rotated horizontally and advanced to the operating position facing the clamp point a. You can also do it.

According to the present invention, the clamp arm 4 is inserted into the clamp bolt 3 on the mounting board 1 so as to clamp the workpiece on the mounting board 1 at one end by tightening the bolt 3. It is fitted into the clamp bolt 3 through the elongated hole 5 so as to be movable in the horizontal direction, and is engaged with the guide pin 6 on the mounting board 1 through the guide groove 7 at the other end, and the engagement provided on the lower surface thereof. Since the crank 8 connected to the clamp bolt 3 is engaged with the portion 9 via the torque limiter mechanism 10, the clamp arm 4 is pushed by the clamp 8 which rotates when the bolt 3 is tightened, and the clamp arm 4 is pushed into the elongated hole 5. The direction of movement of the bolt 3 is regulated by the guide groove 7 and the guide groove 7, so that one end can easily face the clamping point, and the tightening force is automatically released by the torque limiter mechanism 10 to prevent subsequent tightening of the bolt 3. This has the effect of reliably clamping without interfering with the operation.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of one example of the device of the present invention;
The figure is a plan view thereof, FIGS. 3a and 3b are cross-sectional views taken along the line -- in FIG. 1 for explaining its operation, and FIG. 4 is a plan view of a modified example. W... Work, 1... Mounting board, 3... Clamp bolt, 4... Clamp arm, 5... Long hole, 6
... Guide pin, 7 ... Guide groove, 8 ... Crank, 9 ... Engagement part, 10 ... Torque limiter mechanism.

Claims (1)

[Claims] 1 A clamp bolt that is screwed onto the mounting board,
A clamp device comprising a clamp arm that is inserted into the bolt and clamps a workpiece on the mounting board at one end by tightening the bolt, the clamp arm is horizontally connected to the clamp bolt through an elongated hole in the middle thereof. The clamp bolt is inserted so as to be movable in the direction and is engaged with the guide pin installed on the mounting board through the guide groove at the other end, and the clamp bolt is inserted into the engagement portion provided on the lower surface of the clamp bolt through the torque limiter mechanism. A clamping device characterized by engaging a crank connected to.