JPH0351086Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a T-slot clamp.

T using conventionally commonly used T grooves
Most slot clamps have a clamp body and a T-slot part integrated into one body. In order to move the clamp freely using the T groove as a guide, a certain amount of clearance is required. Although there are some standards for T-slots, there are considerable variations even among T-slots of the same standard, so the gap between the T-slot and T-slot becomes even larger.
Therefore, when clamping an object to be clamped, the clamp tilted due to the gap, and the clamping function could not be fully utilized. Furthermore, with conventional clamps, if the thickness of the clamp part of the object to be tightened changes,
The drawback was that it could not be used.

This invention was made in order to improve these conventional drawbacks of the T-slot clamp.

That is, a connecting bolt to which a T-nut is screwed so as to move forward and backward is provided at the lower part of the clamp body, and a cylinder provided in the clamp body is provided with an upper piston having a piston rod that comes into contact with the clamp lever, and a stopper bolt. The drawbacks of the prior art are improved by providing a lower piston connected to the bottom plate.

Next, an embodiment of this invention will be described with reference to the drawings. FIG. 1 is an overall view of a straight-sided crank press 1, in which a die plate 5 of a lower mold placed on a bolster 3 is clamped by a T-slot clamp 7 of this invention. Second
Figures 3 and 3 are a front view and a side view, respectively, of this invention. A clamp lever 17 is rotatably provided on a clamp pin 15 supported by bearings 11 and 13 provided on the upper part of the clamp body 9. The upper part of the connecting bolt 19 is screwed into the lower part of the clamp body 9 directly below the longitudinal center point of the clamp pin 15, and the T-nut 21 is screwed into the lower part of the hexagonal part 23 of this connecting bolt 19. There is.

A hydraulic cylinder 25 is integrally provided in the clamp body 9, and an upper piston 2 is installed inside the hydraulic cylinder 25.
7 and a lower piston 29 are provided. The upper end of the piston rod 31 of the upper piston 27 is in contact with one end of the clamp lever 17. The lower surface of the lower piston 29 is formed into a large diameter head portion 33 that can freely come into contact with the upper surface of the bolster 3. This head portion 33 is urged against the bottom surface of the hydraulic cylinder 25 by stopper bolts 35, 37, stoppers 39, 41, and push springs 43, 45 provided on both sides thereof. The stroke of the lower piston 29, ie, the clearance between the top surface of the head portion 33 and the bottom surface of the hydraulic cylinder 25, is approximately half the thread pitch of the connecting bolt 19. The hydraulic cylinder 25 is provided with a hydraulic oil supply/discharge port 47 .

The intermediate portion 49 of the clamp lever 17 on the side of the hydraulic cylinder 25 has a tension bolt 51 provided between it and the clamp body 9, a push spring 53, and an adjustment nut 55.
The tip of the clamp lever 17 is brought into contact with the upper end of the piston rod 31 of the hydraulic cylinder 25 as described above.

Next, the operation of this embodiment will be explained. When installing the hydraulic T-slot clamp of this invention,
If there is a gap between the T-nut 21 and the T-groove 57 of the bolster 3, screw the T-nut 21 toward the clamp body 9 side by turning an integral number of half turns to minimize the gap, and the remaining gap can be replaced by the connecting bolt. 19
It becomes less than 1/2 of the pitch of In this state,
The T slot portion is inserted into the T groove and the die plate 5 of a predetermined size is tightened. First, when pressure oil is supplied to the hydraulic cylinder 25 from the supply/discharge port 47, the upper piston 27 and the lower piston 29 move upward and downward, respectively. Moving downward, the piston rod 31 of the upper piston 27 pushes up the right end of the clamp lever 17, and at the same time the lower piston 29 presses the bottom plate 33 against the surface of the bolster 3, and the cylinder 2
The bottom surface of the head 33 is 1/1/2 of the stroke of the lower piston, that is, the pitch of the connecting bolt 19.
Increase by 2.

On the other hand, between the T-nut and the T-slot 57 of the bolster 3, the pitch of the connecting bolt 19 is 1/1/2, as described above.
Since a gap remains, although it is less than 2, the clamp body 9 is lifted by the piston rod 31 until the gap disappears. Therefore, the rising dimension of the clamp body 9 and the rising dimension of the hydraulic cylinder 25 are almost the same, so the clamp lever 17 becomes generally horizontal, and the die plate 5 is strongly tightened.

If the thickness of the object to be tightened increases, this can be handled by attaching a plate with an increased thickness under the head portion 33 of the hydraulic cylinder 25. In this case, if connecting bolts 19 of different lengths are prepared, objects to be tightened having different thicknesses over a wide range can be tightened in a normal state.

Although this embodiment is shown for a straight-sided crank press, it can be widely used for clamps using T grooves. The same effect can be obtained even if the lower piston of the cylinder part in this invention is eliminated and the cylinder bottom plate is screwed into the cylinder base plate in an adjustable manner.

As can be understood from the above explanation, the T-slot clamp of this invention has the configuration described in the claims for utility model registration, so even if the gap between the T-slot part and the T-groove is large, Moreover, even if the thickness of the object to be tightened increases, it can be tightened strongly under normal conditions.

[Brief explanation of the drawing]

Figure 1 is an overall view of a straight-side crank press using this invention, Figures 2 and 3 are
FIG. 3 is a front view and a side view of an embodiment of the T-slot clamp of this invention. Explanation of the main symbols shown in the drawings: 1... Straight side crank press, 3... Bolster, 5... Die plate, 7... Hydraulic T-slot clamp, 9... Clamp body, 15... ... Clamp pin, 17 ... Clamp lever, 19 ... Connection bolt, 21 ... Nut, 25 ... Hydraulic cylinder, 27 ... Upper piston, 29 ... Lower piston, 31 ... Piston rod, 33 ... Head part, 35, 37...stopper bolt, 39,4
1... Stopper, 51... Pull bolt, 57...
...T groove.

Claims (1)

[Scope of utility model registration request] A connecting bolt 19 is provided at the lower part of the clamp body 9, in which a removable T-nut 21 is screwed into a T-slot formed on a fixing surface for fixing an object to be clamped, and a connecting bolt 19 is provided in the cylinder 25 provided in the clamp body 9. , an upper piston 27 equipped with a piston rod 31 for actuating the clamp lever 17 that presses and fixes an object to be clamped onto a fixed surface, and a lower piston 29 that can freely come into contact with the fixed surface.
A T-slot clamp characterized by being provided with.