JPH10156736A - Chain clamp tool - Google Patents

Abstract

(57) [Problem] To provide a chain-type clamping tool capable of holding a good circular shape without bending a chain when clamping a work. SOLUTION: In a clamping tool for attaching and detaching a work by winding a chain 3 around the work,
A spring member 14 having a straight or arcuate habit is attached inside the chain 3 along the length direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp tool, such as a vice plier, for attaching and detaching a chain by winding the chain around an outer peripheral surface of a work and tightening the work.

[0002]

2. Description of the Related Art FIG. 6 shows a vice plier which is a conventional clamping tool. One end of a chain (3) is provided at the tip of one lever (1) of a pair of operating levers (1) and (2). Connecting pin
It is pivoted by (4). At the tip of the other lever (2), a pair of hooks (5) is formed.
(5) can be engaged with two adjacent rollers (6) in the chain (3).

In this vice plier, after a chain (3) is made to extend along the outer peripheral surface of a work (not shown) such as a pipe,
A suitable roller (6) in the chain (3) is connected to a pair of hooks.
The chain (3) firmly clamps the work by hooking it on (5) and strongly gripping the operation levers (1) and (2), so that the work can be detached from each other.

[0004]

However, in the conventional tool, as shown in FIG. 6, the chain (3) is bent at an intermediate portion and cannot maintain a circular shape. It is necessary to adjust the position along the outer peripheral surface of the work. For this reason, there is a problem that workability for clamping the work is poor and that the hands become dirty.

[0005] The present invention has been made in view of such a problem of the conventional tool, and has a structure in which the chain can maintain a circular shape, thereby improving the workability at the time of clamping. It is an object of the present invention to provide a clamping tool.

[0006]

According to the present invention, the above-mentioned problem is solved as follows. (1) A chain-type clamping tool for performing work such as attaching and detaching a work by winding the chain around the work,
A long spring material having a straight or circular habit is attached along the length of the chain.

(2) In the above item (1), the spring material is inserted between both plates of the chain on the side to be wound around the work.

(3) In the above item (2), claws for preventing the spring material from coming off are provided inward at a plurality of positions of the paired plates facing each other in the chain.

(4) In the above item (1), the spring material is in the form of a wire, which is inserted into the projecting end of each pin of the chain.

[0010]

1 and 2 show a first embodiment in which the present invention is applied to a vice plier. As shown in FIG. 1, a tip of one lever (1) is provided at the end of one lever (1). The end (3a) of the chain (3) is pivotally connected by a connecting pin (4).

The other end (3b) of the chain (3) is a free end, and an appropriate roller (6) at the intermediate portion of the chain (3) is connected to the other operation lever (2) as in the conventional case. 1) at the tip of
The chain (3) is tightened by engaging the pair of hooks (5) and firmly gripping the levers (1) and (2). (7)
Is an adjusting screw for adjusting the interference of the chain (3), (8)
Is a release lever for releasing the tightening.

As shown in FIGS. 2 and 5, the chain (3) has a pair of rollers (6) on both sides of a pair of inner plates.
Each inner plate supported by (9) and adjacent
(9) are formed to have a predetermined length by continuously connecting the outer plates (12) fitted to both ends of a pin (11) penetrating each roller (6).

As shown in FIG. 1, when an appropriate roller (6) is engaged with a hook (5) of the other operation lever (2), the chain (3) is attached to an outer peripheral surface of a work (not shown). A spring member (14) is attached to the side of the chain (3) wound around the work (inside of the closed ring) so as to form a closed ring shape that can be wound.

At one end of the spring member (14), a locking hook (15) bent in an outward U-shape is provided.
As shown in FIG. 2, by engaging the roller (6) at the base end (operation lever (1) side) of the chain (3), the inside of the chain (3), Inner plate
(9) and is attached along the length direction. Therefore, the spring member (14) is not exposed from the plates (9) and (12), and does not interfere with the work and hinder the work clamping.

The spring member (14) is made of a thin strip-shaped spring steel having a habit of forming a straight line or an arc having a large radius of curvature in a free state, and is attached to the inside of the chain (3). , Are held in a straight or circular shape. Therefore, when the appropriate roller (6) is engaged with the hook (5) of the operation lever (2), the chain (3) is prevented from being bent and is always kept in a circular shape, so that the workpiece is clamped when clamping the work. It is not necessary to adjust the shape by hand, and the workability at the time of clamping is improved, and the hand is not stained.

FIGS. 3 and 4 show a second embodiment of the present invention, in which the inner plate (9) of the chain (3) has an inner peripheral portion at a required portion on a side to be wound around a work. The claws (16) bent in the direction are continuously provided in opposition.

A spring material (1) is provided between the pawl (16) and the roller (6).
By loosely fitting 4), the spring member (14) is prevented from coming off. Therefore, the spring member (14) can be stably mounted.

In order to prevent the claws (16) from coming into contact with the outer peripheral surface of the work during clamping, the claws (16) should be flush with the outer peripheral end surface of the inner plate (9) or slightly. It is good to form so that it may become low.

FIG. 5 shows a third embodiment of the present invention, in which a roller (6), an inner plate (9), and an outer plate (12).
Through holes (18) at both protruding ends of each pin (11)
Is drilled so as to be linearly aligned in the length direction of the chain (3), and a wire-like spring material having a habit of forming a straight or circular arc in the through hole (18) as described above. That is, the piano wire (19) is inserted.

By inserting the piano wire (19), the bending of the chain (3) is prevented and the workability at the time of work clamping can be improved as in the above embodiment.

The present invention can be applied to tools other than the vise pliers as long as the tools have a chain.

[0022]

According to the present invention, the following effects can be obtained. (A) According to the first aspect of the present invention, the spring member attached along the length direction of the chain has a linear or arc-shaped habit, so that the chain can be maintained in a circular shape without being bent, and can be used when clamping a workpiece. Workability is improved.

(B) According to the second aspect of the present invention, since the spring member does not interfere with the work, it does not interfere with the clamping.

(C) According to the third aspect of the present invention, since the pawl serves to prevent the spring material from coming off, the spring material can be stably attached, and the workability is improved.

(D) According to the invention of claim 4, (a)
Similarly to the above, the chain can be prevented from being bent.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire first embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part of FIG.

FIG. 3 is a perspective view of a main part showing a second embodiment of the present invention.

FIG. 4 is an enlarged vertical sectional front view of the nail.

FIG. 5 is a perspective view of a main part showing a third embodiment of the present invention.

FIG. 6 is a perspective view of a conventional clamping tool.

[Explanation of symbols]

 (1) (2) Operation lever (3) Chain (4) Connecting pin (5) Hook (6) Roller (7) Adjusting screw (8) Release lever (9) Inner plate (11) Pin (12) Outer plate ( 14) Spring material (15) Locking hook (16) Claw (18) Through hole (19) Piano wire (spring material)

Claims (4)

[Claims] 1. A chain-type clamping tool for attaching and detaching a work by winding the chain around a work, comprising: Chain type clamping tool, which is attached along the vertical direction. 2. A spring material is inserted between both plates of a chain on a side to be wound around a work.
The described chain clamp tool. 3. The chain-type clamping tool according to claim 2, wherein claws for preventing the spring material from coming off are provided inward at a plurality of positions of the pair of opposed plates in the chain. . 4. The chain-type clamping tool according to claim 1, wherein the spring material has a wire shape and is inserted through the projecting end of each pin of the chain.