JP2001187904A - Linking type clamp cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and strongly assemble a link support pin in respect to a rod cover while utilizing the rod cover as a common item. SOLUTION: A piston 6 is housed in a cylinder tube 1, while a piston rod 7 penetrates into a guide hole 8 of a rod cover 4. A clamper 11 is oscillatably attached to an upper end of the piston rod 7, while an upper end of a link 13 is supported to its intermediate portion. A vertically penetrating through-hole 14 is formed on the rod cover 4, into which a support pin 15 supporting the lower end of the link 13 is inserted from a lower side of the rod cover 4. An escape preventive extension part 17 is formed on the lower end of the support pin 15, and sandwiched between the cylinder tube 1 and the rod cover 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a link type clamp cylinder.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
The support portion 54 of the link 53 is formed integrally with the clamper 55 so that the linear motion of the piston rod 51 is
Link-type clamp cylinders configured to convert the rocking motion into a swing motion are known.

[0003]

However, according to this clamp cylinder, since the support portion 54 of the link 53 is formed integrally with the rod cover 52, these materials cannot be made different depending on the function. However, the application of the rod cover 52 is limited to only the link type clamp cylinder. For example, there is a problem that the rod cover 52 cannot be commonly used for a clamp cylinder of a type in which the clamper moves in parallel (see FIG. 5).

It is an object of the present invention to provide a link type clamp cylinder having a simple structure that can select a material suitable for the function of a part and can use a rod cover as a common part.

[0005]

In order to solve the above-mentioned problems, a link-type clamp cylinder according to the present invention is a clamp cylinder for converting a linear motion of a piston rod into a swinging motion of a clamper via a link. Attach a rod cover through which the piston rod penetrates to the cylinder tube that houses the cylinder, form an insertion hole that penetrates vertically in the rod cover, insert a support pin that supports the link into the insertion hole, and tension the lower end of the support pin. A projecting portion is formed, and the projecting portion is prevented from falling off.

In the link type clamp cylinder of the present invention, a fitting portion is provided at the lower end of the insertion hole, the fitting portion being fitted with the projecting portion.
The overhang is configured by being sandwiched between a cylinder tube and a rod cover. In this case, in order to facilitate the processing, it is preferable that the overhang portion is formed by at least a part (or all) of the large-diameter portion in which the diameter of the support pin is increased. Also, when using a link type clamp cylinder in a machine tool, etc., in order to reduce the amount of protrusion of the rod cover to the work side,
It is preferable that the fitting portion is provided so as to project in a direction orthogonal to a line connecting the center of the piston rod and the center of the support pin.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the main body of the link type clamp cylinder has a bottom plate 2 attached to a lower end of a cylinder tube 1 with bolts 3 (see FIG. 3), and a rod cover 4 attached to an upper end of the cylinder tube 1.
Are assembled with bolts 5. Note that the bottom plate 2 may be formed integrally with the cylinder tube 1. A piston 6 is slidably housed inside the cylinder tube 1, and its piston rod 7 is
Through the guide hole 8. Sealing materials 19 and 20 for sealing a gap with the piston rod 7 are mounted in the guide hole 8. The rod cover 4 has two ports 9, 1
0, one port 9 communicates with the lower piston chamber 1a through a communication hole 9a formed in the cylinder tube 1 and the bottom plate 2, and the other port 10 communicates with a communication hole 10a formed in the rod cover 4. Through the upper piston chamber 1b. Then, the piston 6 and the piston rod 7 are reciprocally driven by pressurized fluid supplied alternately from the ports 9 and 10.

A clamper 1 is provided at the upper end of the piston rod 7.
1 is attached at its rear end by a horizontal support shaft 12 so as to be able to swing up and down.
The upper end of 3 is rotatably supported by a horizontal support shaft 13a. An insertion hole 14 is formed in the rod cover 4 so as to penetrate the rod cover 4 in a vertical direction. 15a rotatably supported. Each support shaft 12, 13a, 15a is arranged in parallel with each other. The link 13 is swung left and right by the linear movement of the piston rod 10 in the vertical direction, the clamper 11 is swung up and down, and the clamp position (the solid line position in FIG. 1) protruding to the side of the rod cover 4. ) And an unclamping position (solid line position in FIG. 1) standing above the rod cover 4.

As shown in FIG. 3 and FIG.
A protrusion 17 is formed at the lower end of the protrusion.
Is provided with a pair of flat surfaces 17a. In the illustrated example, a large-diameter portion having a large diameter is formed at the lower end of the support pin 15, and both sides of the large-diameter portion are cut off to provide a flat portion 17a.
The overhang portion 17 is formed by the remaining portion of the large diameter portion. At the lower end of the insertion hole 14, a substantially rectangular fitting portion 18 into which the projecting portion 17 fits is formed at a line connecting the center of the piston rod 7 and the center of the support pin 15 at the same depth as the thickness of the projecting portion 17. It is formed so as to project in a direction perpendicular to the direction. The projecting portion 17 is sandwiched between the cylinder tube 1 and the rod cover 4, and the support pin 15 is fixed to the rod cover 4 so that it cannot be pulled out and cannot rotate. In the illustrated example,
The two surfaces of the fitting portion 18 are provided with rotation restricting surfaces 18a which are joined to the flat surface 17a of the overhanging portion 17, but the support pin 15 is connected to the piston rod 7 via the link 13 and the clamper 11.
And its rotation is regulated, so that the overhang portion 1
7 and the rotation regulating surface 18a of the fitting portion 18 may be omitted.

According to the link-type clamp cylinder having the above structure, since the link 13 is supported by the support pin 15 separate from the rod cover 4, the support pin 15 is not used.
In a clamp cylinder of the type in which the clamper 11 moves in parallel as shown in FIG. 5, the rod cover 4 can be used as a common component. In addition, rod cover 4
Since the rod cover 4 and the support pin 15 are provided separately, the rod cover 4 is formed of a material having excellent slidability such as casting or ductile cast iron, and the support pin 15 is formed of a mechanical material such as a carburizing material or a quenched material. It is possible to select a material suitable for the function of each component, such as a material formed of a material having excellent strength.

Further, according to the link type clamp cylinder of this embodiment, if the rod cover 4 is attached to the cylinder tube 1 after the support pin 15 is inserted into the insertion hole 14, the overhang portion 17 Since the support pin 15 is sandwiched by the cover 4, the support pin 15 can be easily and firmly assembled to the rod cover 4 in an accurate direction without using another component such as a bolt, and there is an advantage that the cost of parts can be reduced. Since the fitting portion 18 into which the projecting portion 17 is fitted is provided so as to project in a direction perpendicular to a line connecting the center of the piston rod 7 and the center of the support pin 15, the link type clamp is provided. When the cylinder is used in a machine tool or the like, the rod cover 4 can be formed in a compact shape with a small amount of protrusion to the work side (the right side in FIG. 1), and the clamper 11 moves the work in a position close to the piston rod 7. Can be clamped.

The present invention is not limited to the above-described embodiment, but may be carried out by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention, as exemplified below. It is possible. (1) As shown in FIG. 6, the projecting portion 17 is formed by the entire large diameter portion provided on the support pin 15. (2) The projecting portion 17 is formed in a claw shape, and the fitting portion 18 of the insertion hole 14 is formed in a notch shape. (3) Instead of using the cylinder tube 1 to prevent the protrusion 17 from coming off, the cylinder tube 1 or the rod cover 4
Perform with the retaining member provided in the etc. (4) The present invention is applied to a link type clamp cylinder in which the piston 5 is slid in one direction by the spring force of a spring and is slid in the other direction by a pressurized fluid.

[0013]

As described in detail above, according to the link type clamp cylinder of the present invention, the rod cover and the support pin can be selected from materials suitable for their functions, and the rod cover can be used as a common part. In addition, there is an excellent effect that the support pins can be easily and firmly assembled to the rod cover, and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a link type clamp cylinder showing one embodiment of the present invention.

FIG. 2 is a plan view of the clamp cylinder of FIG.

FIG. 3 is a bottom view of the clamp cylinder of FIG. 1;

FIG. 4 is a perspective view of a support pin.

FIG. 5 is a partially cutaway front view of a clamp cylinder showing another use of the rod cover.

FIG. 6 is a perspective view showing another embodiment of the support pin.

FIG. 7 is a front view showing a conventional link type clamp cylinder.

[Explanation of symbols]

1. Cylinder tube, 4. Rod cover, 6.
Piston, 7 piston rod, 11 clamper, 13 link, 14 insertion hole, 15 support pin, 17 projecting part, 18 fitting part.

Claims (4)

[Claims] In a clamp cylinder for converting a linear motion of a piston rod into a swinging motion of a clamper via a link, a rod cover through which the piston rod penetrates is attached to a cylinder tube for accommodating the piston, and the rod cover is vertically mounted on the rod cover. A link type clamp cylinder in which an insertion hole is formed to penetrate the support hole, a support pin for supporting the link is inserted into the insertion hole, an overhang is formed at the lower end of the support pin, and the overhang is prevented from coming off. 2. The link-type clamp cylinder according to claim 1, wherein a fitting portion is provided at a lower end portion of the insertion hole so that the projecting portion is fitted, and the projecting portion is sandwiched between the cylinder tube and the rod cover. 3. The link-type clamp cylinder according to claim 2, wherein the overhang portion is formed by at least a part of a large-diameter portion in which the diameter of the support pin is increased. 4. The link type clamp cylinder according to claim 2, wherein the fitting portion is provided so as to project in a direction perpendicular to a line connecting the center of the piston rod and the center of the support pin.