JPS6236592Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a manual clamping device that can clamp a workpiece in one operation.

(Prior art) A workpiece can be clamped in one motion.
A typical one-touch type clamp device is a toggle clamp type.
However, this toggle clamp type has the disadvantage that when unclamping, the clamp handle and clamp claw escape upwards relative to the device mounting surface, so that it cannot be used if there is an obstacle above. In addition, screw clamp types are also widely used, but when using coarse screws, for example, the rotation angle is forced to be large, resulting in poor workability. In the case where the screw lead angle is large, sufficient clamping force cannot be obtained.

(Purpose of the invention) In view of the above-mentioned problems of the conventional technology, the present invention provides a manual clamping device that can obtain a large clamping force with a small clamping stroke, is free from space constraints, and has excellent workability. The purpose is to

(Structure of the invention) The purpose of this is to rotatably install a pair of cylindrical cams having an appropriately inclined step on a shaft set up on the jig body, so that the rotational movement of one cylindrical cam is transferred to the other cylindrical cam. This is achieved by a manual clamping device that converts the movement into the vertical movement of the cam and clamps the workpiece with a clamping claw attached to the other cylindrical cam.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

1 and 2 show the structure of a manual clamping device according to the present invention. In these figures, reference numeral 1 denotes a jig body, and a shaft 3 having a stopper portion 2 at the top thereof is screwed upright on the jig body 1. A lock nut 4 is fastened to the lower end of the shaft 3, which is visible to the jig body 1, so that the shaft 3 is always prevented from loosening, and when the lock nut 4 is loosened, it can be rotated as appropriate. The height of the upward protrusion can be finely adjusted.

5 is an upper cylindrical cam, and 6 is a lower cylindrical cam, each having engageable steps 5a, 6a, and the steps 5a,
They are rotatably mounted on the shaft 3 with their 6a facing each other. A clamp handle 7 is attached to the upper cylindrical cam 5, and a clamp claw 8 having a claw portion 8a at one end is attached to the lower cylindrical cam 6 by bolts 9, 9.

Further, a disc spring 10 is interposed on the shaft 3 between the stopper part 2 and the upper cylindrical cam 5, and a compression spring 11 is interposed on the shaft 3 between the jig main body 1 and the clamp claw 8. As a result, the upper and lower cylindrical cams 5 and 6 are supported in a floating state under the disc spring 10 while always being engaged with each other.

Reference numeral 12 denotes a fulcrum bolt that projects downward from the other end of the clamp claw 8 and engages with a first stopper 13 screwed onto the jig main body 1 so that the clamp claw 8
It will regulate the movement of Further, a second stopper 14 is separately provided on the jig body 1 to regulate and brake the movement of the clamp claw 8. This second stopper 14 is provided with a retractable ball 17 supported by a compression spring 16 in a groove 15, and by pressing the ball 17 against the end surface of the clamp claw 8, the clamp claw 8 can be moved. brake.

Here, the steps 5a and 6a formed on the upper and lower cylindrical cams 5 and 6 have a sine curve shape as shown in FIG. The height h is set to about 2 to 3 mm.

With this configuration, when the workpiece W is set on the jig main body 1 and the operator grips the clamp handle 7 and turns it in the direction A (FIG. 2), the lower part engages with the upper cylindrical cam 5. The cylindrical cam 6 therefore rotates the clamp claw 8, and the fulcrum bolt 12 is brought into contact with the first stopper 13 to stop the rotation. In this state, when the clamp handle 7 is further turned, the upper and lower cylindrical cams 5 and 6 slide against each other on the steep slope part 18 (Fig. 4) of the steps 5a and 6a, and the lower cylindrical cam 6 is relatively lowered. . This lowering of the lower cylindrical cam 6 causes the clamp claw 8 to bring its claw portion 8a into contact with the work W. In this state, when the clamp handle 7 is further turned, the upper and lower cylindrical cams 5 and 6 are moved. An axial force is applied by the disk spring 10 to the apex gentle slope portion 19 (FIG. 4), thereby firmly clamping the workpiece W.

When unclamping, the clamp handle 7 is rotated in the opposite direction to that described above, i.e., in the direction B (Fig. 2), and unclamping is performed in the reverse order of the clamping described above. At this time, when the clamp claw 8 is rotated until it abuts against the second stopper 14, the ball 17 engages with the end face of the clamp claw 8 and a pressing force acts, so that the clamp claw 8 does not rotate freely and is locked in the chain line position in Fig. 2.

However, the rotation range of the clamp claw 8 and therefore the clamp handle 7 is set to be approximately 60 degrees, and the clamp stroke of the clamp claw 8 is approximately 2 to 3 mm. This means that a predetermined clamping operation can be maintained without interfering with any obstacles. Furthermore, according to this clamping method, it is possible to generate a clamping force of approximately 200 kg or more.

Figures 5 and 6 show an example of how this manual clamping device is used. Clamping device main bodies 21 and 21 are arranged on both sides of a jig main body 20 that spreads into two, respectively. The workpiece W can be clamped by the clamping device body parts 21, 21, and it is also possible to install this on an assembly conveyor line, for example.

Note that the means for restricting the operation of the clamp claw 8, such as the first and second stoppers 13 and 14, are not limited to the above embodiments, and for example, a magnet may be used to control the movement of the clamp claw 8.
Alternatively, the brake may be applied.

(Effects of the invention) As explained above in detail, the manual clamping device according to the invention has a pair of cylindrical cams rotatably provided on the jig body, each having an appropriately inclined step. The rotational movement is converted into the vertical movement of the other cylindrical cam so that the workpiece can be clamped with the clamp claw attached to the other cylindrical cam. This allows a large clamping force to be obtained with a small clamping stroke. As a result, the workability and safety of the clamp have been significantly improved. Further, since the operating range of the clamp is extremely small, the degree of freedom in installation of the present manual clamp device is increased, and together with the above-mentioned high workability, the range of use is significantly expanded.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part showing the structure of the manual clamp device according to the present invention, Fig. 2 is a plan view showing the same structure and operating state, and Figs. 3 and 4 are the shapes of the upper and lower cylindrical cams. 5 and 6.
The figures are a plan view and a side view showing how the manual clamp device is used. 1...Jig body, 2...Stopper part, 3...Shaft, 5...Upper cylindrical cam, 6...Lower cylindrical cam,
5a, 6a...step, 8...clamp claw, 10...
... disc spring, 11 ... compression spring, 12 ... fulcrum bolt, 13 ... first stopper, 14 ... second stopper.

Claims (1)

[Scope of utility model registration request] a shaft that is erected on the jig main body and has a stopper portion on the top; an upper cylindrical cam and a lower cylindrical cam that have appropriately inclined steps and are rotatably provided on the shaft with the steps facing each other; A disc spring interposed in the shaft between the stopper portion and the upper cylindrical cam, a clamp pawl fixed to the lower cylindrical cam, a biasing means for biasing the clamp pawl upward, and the clamp pawl. 1. A manual clamping device comprising: a regulating means for regulating rotation of the upper cylindrical cam; and a clamp handle attached to the upper cylindrical cam.