JP2531894Y2 - Positioning clamp device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning clamp device mounted on a jig used in an automobile floor assembling process or the like.

[0002]

2. Description of the Related Art Conventionally, as a clamp device of this type, Japanese Patent Publication No. Sho 56-34873 discloses a positioning pin which can be fitted into a positioning hole formed in a work and a seat for receiving a hole edge of the positioning hole. A main body, a cylinder attached to the main body, and a clamp piece provided in the main body so that a tip end thereof reaches a slit formed in the positioning pin and moved by the cylinder in an axial direction of the positioning pin. The main body part, the clamp piece is tilted in accordance with the movement in the axial direction, and the clamp piece is unclamped with its tip part immersed in the slit, and the tip part is positioned from the slit. A cam groove is formed to protrude outward from the pin and switch between the clamp and the receiving seat to clamp the edge of the hole. And a clamp piece to the clamp state after-decided Me pin is set to work to fit into the positioning hole, which was to clamp and position the workpiece is known. In this product, the cylinder is mounted on the main body by positioning it on the same axis as the positioning pin.
The piston rod of the cylinder is directly connected to the tail end of the clamp piece to move the clamp piece in the axial direction of the positioning pin.

[0003]

In the above device, since the main body and the cylinder are arranged in series in the axial direction of the positioning pin, the size of the device in the axial direction is increased, and the clamping device is moved so that the positioning pin faces upward. When standing on a jig, the clamp device cannot be placed in a place where the height space between the jig and the work is narrow, and the part of the work located inside the clamp device with respect to the outer edge of the work When welding the gun arm of the welding gun into the lower space of the work from the outer edge of the work closest to the welded part, the gun arm hits the clamp device in front of the welded position. The gun arm must be inserted into the lower space of the work from the outer edge of the work relatively far from the weld so that Not, is the insertion distance of the gun arm with respect to the workpiece is long, work efficiency is equipment costs become necessary welding gun of large large arm length is increase problems with the worse. Also, when clamping at the edge of the hole with the clamp piece, an eccentric load may be applied to the clamp piece due to the inclination of the edge of the hole to tilt the clamp piece in a direction perpendicular to the tilting direction by the cam groove. In this case, in the above conventional device,
An eccentric load acts on the piston rod connected thereto via the clamp piece, and the piston tends to be twisted. In view of the above, the present invention has been made to provide a clamping device that reduces the device size in the axial direction of a positioning pin and prevents the piston from twisting even when an eccentric load is applied to a clamp piece. The purpose is.

[0004]

In order to achieve the above object,
According to the present invention, in the above-mentioned conventional apparatus, the cylinder is attached to the main body in such a position that its axis is substantially orthogonal to the axis of the positioning pin, and the movement of the piston rod of the cylinder is provided in the main body. A link member, which is converted into a substantially orthogonal direction and transmitted to the clamp piece, is provided to be supported by the main body.

[0005]

When the piston rod of the cylinder moves in the cylinder axis direction, the clamp piece moves in the direction substantially perpendicular to the cylinder axis, that is, in the axis direction of the positioning pin, via the link member. Thus, the clamp piece is switched between the unclamped state and the clamped state. Even if an eccentric load acts on the clamp piece when clamping the hole edge of the work by switching to the clamp state, this eccentric load is received by the link member supported by the main body and does not act on the piston rod, No piston twisting occurs. Since the cylinder is arranged orthogonally to the axis of the positioning pin, the size of the device in the axial direction is reduced. Therefore, when the clamp device is arranged on the jig such that the positioning pin faces upward, the clamp device can be arranged also in a place where the space in the height direction between the jig and the work is narrow. Also, since there is no cylinder at the lower part of the main body, when welding the welded part of the work located inside the arrangement part of the clamp device, the welding gun is placed in the lower space of the work from the outer edge of the work closest to the welded part. Even when inserted, the gun arm can reach the welding site through the lower space of the main body.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, the present invention is applied to a clamp device 2 mounted on a jig 1, and the clamp device 2 has a horizontally elongated main body as shown in FIGS. A mounting seat 4 having a screw hole 4 a is formed on the lower surface of the tail end of the main body 3, and the clamp device 2 is bolted to the bracket 1 a erected on the jig 1 at the mounting seat 4. . The upper surface of the front end portion of the body portion 3, the positioning pin 5 to be fitted into the positioning hole A ₁ formed in the workpiece A, it was a seat 6 for receiving the hole edge portion of the positioning hole A ₁ integrally formed The pin member 7 with the flange is bolted,
The pin member 7 can be exchanged according to the type of the work. The main body 3 is formed in a hollow shape that opens up and down. Further, a slit 8 is formed in the positioning pin 5 in a diametrical direction over substantially the entire length thereof. The clamp piece 9 having a length reaching the slit 8 of the fifth piece was stored. As shown in FIG. 3, the clamp pieces 9 are formed in cam grooves 10 formed on both side walls of the main body 3.
A pair of upper and lower guide pins 11 attached to the clamp piece 9;
12 slidably engaged with the clamp piece 9
According to downward movement of the tip portion 9a protrudes outward of the positioning pin 5 to clamp the hole edge portion of the positioning hole A ₁ between the seat 6, while the upward movement of the clamp piece 9 According to this, the upper guide pin 11 is inserted into the inclined portion at the upper end of the cam groove 10, and the clamp piece 9 is tilted so that the tip end 9 a is immersed in the slit 8. In addition, an unclamping operation associated with the upward movement and a clamping operation associated with the downward movement are provided.

The clamp piece 9 is moved up and down by a cylinder 13. The cylinder 13 is mounted on the tail end face of the main body 3 so that the cylinder axis is orthogonal to the axis of the positioning pin 5, that is, horizontal. A link member 14 is provided in the main body 3, and the clamp piece 9 is moved up and down via the link member 14 by a horizontal movement of a piston rod 13 a of the cylinder 13. In the present embodiment, the link member 14 is formed of a bell-crank-shaped lever having a horizontal portion 14a and a bent portion 14b extending upward from a tail end thereof. As shown in FIG. The lower end of the bifurcated bent portion 14b is pivotally supported by the main body 3 via the pivot 14c, and the bifurcated tip of the horizontal portion 14a is positioned below the clamp piece 9 in the elongated hole 14d formed therein. Guide pin 1
2 and a long hole 14 formed in the upper end of the bent portion 14b.
e, the connecting pin 1 laterally provided on the piston rod 13a
5 and the clamp piece 9 is attached to the piston rod 13a.
When the rod 13a moves forward, the rod 13a moves upward. The clamping piece 9 is moved downward when to clamping operation as described above, offset load to be incline them in the axial direction of the guide pins 11 and 12 to the clamp piece 9 by the slope or the like of the hole edge portion of the positioning hole A ₁ is However, the offset load is received by the main body 3 supporting the link load via the link member 14, and the offset load does not act on the piston rod 13a. In this case, the link member 14 is
It is desirable to make sliding contact with the walls on both sides of the link member 14 so that the unbalanced load acting on the link member 14 can be received not only on the support portion of the pivot 14c but also on both walls.

By the way, as shown in FIG. 5, a work A to be positioned and clamped by the clamp device 2 is
Second work B in the inner portion than the positioning hole A ₁
When welding is performed, a space is formed below the distal end portion of the main body portion 3 located directly below the positioning pin 5 in the clamp device 2, so that the lower gun arm 16a of the welding gun 16 can be inserted through the space to the welding site. Thus, the insertion distance of the welding gun 16 from the outer edge of the work is reduced as much as possible,
It becomes possible to efficiently perform welding work on a welded portion. When there is no need to insert a gun arm or the like into the lower space of the work, the clamp device 2 is directly attached to the jig 1 at the mounting seat 4 of the main body 3. In this case, the height of the clamp device 2 is reduced by the length of the cylinder, as compared with the conventional device in which the cylinder is mounted on the main body part coaxially with the positioning pin, and the jig and the work are separated. The clamping device 2 can also be arranged in a place where the space in the height direction is narrow.

[0009]

As is clear from the above description, according to the present invention, the dimension of the positioning pin in the axial direction can be reduced, so that the space between the jig and the work in the height direction is narrow. A space where the gun arm can be inserted is secured below the main body of the clamp device, and a gun arm can be inserted through the space from the outer edge side of the work to the welding point of the work located inside the arrangement portion of the clamp device. Insertion can be performed at as short a distance as possible, thereby improving the efficiency of the welding operation and using a small gun having a short arm length as a welding gun, thereby reducing equipment costs. Further, the bias load acting on the clamp piece can be received by the main body that supports the clamp piece via the link member, so that the bias load does not act on the piston rod, the twisting of the piston can be prevented, and the durability can be improved. .

[Brief description of the drawings]

FIG. 1 is a cutaway side view of an example of the device of the present invention.

FIG. 2 is a bottom view thereof.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a sectional view taken along the line IV-IV of FIG. 1;

FIG. 5 is an explanatory view showing the positional relationship between the welding gun and the clamp device as viewed from the direction of arrow V in FIG. 1;

[Explanation of symbols]

2 Clamping device 3 Body 5 Positioning pin 6 Receipt 8 Slit 9 Clamp piece 9a Tip of clamp piece 10 Cam groove 13 Cylinder 13a Piston rod 14 Link member

Claims (1)

(57) [Scope of request for utility model registration] 1. A main body having a positioning pin that can be fitted into a positioning hole formed in a workpiece and a receiving seat for receiving a hole edge of the positioning hole, a cylinder attached to the main body, and a tip in the main body. A clamp piece provided so as to reach a slit formed in the positioning pin, the clamp piece being moved in the axial direction of the positioning pin by the cylinder, and the main body portion is provided with the clamp piece along with the movement in the axial direction. The clamp edge is tilted, and the clamp piece is unclamped such that the tip end thereof is immersed in the slit, and the hole edge portion is formed between the clamp piece and the receiving seat where the tip end projects outside the positioning pin from the slit. In a device having a cam groove for switching between a clamp state and a clamping state, the cylinder is mounted on the main body in such a posture that its axis is substantially perpendicular to the axis of the positioning pin. A positioning clamp device, wherein a link member that converts the movement of a piston rod of the cylinder into a substantially orthogonal direction and transmits the same to the clamp piece is provided in the main body portion, the link member being supported by the main body portion.