JPS6036988Y2 - Electric wire grip part - Google Patents

Description

[Detailed Description of the Invention] The present invention is a method of tightening a clamp body and a cap by screwing in a bolt to prevent the screwed-in bolt from loosening at the wire gripping portion of a nut cracker type clamp that grips an electric wire.

Conventionally, in order to attach a spacer, damper, etc. to an overhead power transmission line, a nut cracker type clamp has been used in which a clamp body and a cap are hinged at one end, and a bolt is screwed into the other end to grip the electric wire.

This nut cracker type clamp is tightened by inserting a bolt through the clamp body through a leaf spring and spring washer, and screwing this into the cap.It is widely used because it has a simple structure and anyone can easily install it. .

However, when installing by tightening bolts, there are individual differences in the tightening force, and there is a risk that the bolts may loosen after tightening, or in other words, due to creep, and this creep cannot be absorbed with a leaf spring or spring washer. .

Additionally, there was a risk that the tightened bolts would come loose if a shocking force such as gear lopping or three-lead jump was applied to the overhead power transmission line.

Furthermore, a system has recently been developed that allows one-touch tightening of the clamp body and cap without bolts, but it has the disadvantage of a complicated structure.

In addition, as another conventional example, the bolt for tightening the clamp body and the cap is a T-head bolt, and the clamp body or the cap is provided with a vertically long through hole and a horizontal groove orthogonal to the through hole, and the T-head bolt is It is known that the head of the bolt is inserted into a through hole and engaged with a horizontal groove, and a nut is fitted and tightened at the end of the bolt (see Japanese Utility Model Publication No. 44-23458).

However, since this clamp simply tightens the nut directly onto the bolt, there is a risk that the nut may loosen if vibration or impact force is applied to the clamp, and the nut may become loose on the underside of the nut. Even when using a spring washer, etc., the nut must be tightened with the T-shaped head engaged with the horizontal groove, so be careful not to rotate the T-shaped bolt when tightening the nut. This has the disadvantage that the nut must be tightened using the same force, which makes tightening the force bolt troublesome.

In view of this, the present invention improves the bolt tightening method and devises a wire gripping part using a nut cracker type clamp that prevents the bolt from loosening. The bolt is inserted through the clamp body through a large repulsive spring and screwed into the cap, and the angular protrusion protruding from the cap is engaged with the angular engagement part of the plate inserted from the side of the cap. This prevents it from rotating on its own and prevents it from loosening.

Next, this will be explained in more detail based on the embodiment shown in the drawings.

FIG. 1 (front view) and FIG. 2 (side view) show an example of a wire gripping part using a nut cracker type clamp according to the present invention, in which one end of a clamp body 1 and a cap 2 are hinged 3, and A bolt 5 is screwed into the other end of the clamp body 1 and the cap 2 via a repulsive spring 6, and the clamp body 1
It is the same as the conventional one in that the electric wire 4 inserted between the cap 2 and the cap 2 is gripped.

Note that 7 in the figure indicates an elastic rubber layer lined in the gripping groove of the electric wire 4 as required.

In the present invention, in such a wire gripping part, the bolt 5 is provided with an angular protrusion 8 at the tip as shown in FIG.
It was inserted through the clamp body 1 through the cap 2 and screwed into the cap 2.

By this screwing, a square projection 8 is provided at the tip of the bolt 5.
protrudes from the cap 2, and this protruding angular projection 8 is
The angular engaging portion 10 provided approximately at the center of the plate-like member 9 inserted from the lateral direction of the cap 2 is fitted into, for example, a through hole for engagement.

This engagement locks the rotation of the bolt 5, preventing self-rotation and preventing the tightened bolt 5 from loosening.

In order to engage the angular protrusion 8 with the angular retaining portion 10 of the plate-shaped body 9, place the plate-shaped body 9 in the position shown by the dashed line in FIG. By shifting the shaped body 9 in the direction of the arrow in the figure, the angular protrusion 8 can be easily engaged with the angular engaging portion 10.

Furthermore, in the present invention, the coil spring 6 inserted through the bolt 5 has a large amount of deflection and high repulsion, so it can sufficiently absorb the fatigue of the bolt 5 and there is no risk of the bolt 5 loosening. It can be anything.

Further, although the angular projection 8 provided on the head of the bolt 5 is shown in the shape of a square prism in the figure, it goes without saying that the invention is not limited to this.

Further, if a plate spring is used for the plate-shaped body 9 inserted laterally into the cap 2, it will curve when the bolt 5 is tightened, thereby facilitating the insertion of the angular projection 8.

Further, the angular engaging portion 10 is not limited to a through hole, but may be a angular recess.

As explained above, according to the present invention, it is easy to tighten the clamp main body and cap, which have a conventionally known structure, by normal tightening work. Since self-rotation is prevented, a stable gripping force can be maintained over a long period of time without loosening even when an impact force is applied.

In addition, the customer's product was designed by rotating the bolt head with a wrench or the like to tighten it to a specified amount, and after tightening, the bolt was engaged with the angular engagement part of the plate-shaped cap inserted into the angular protrusion at the tip of the bolt from the side of the cap. Therefore, when tightening the bolt, there is no need to be careful not to dislodge the engaging part as in conventional products, for example, the one disclosed in Publication of Utility Model Publication No. 44-23458. It's easier than other products.

Furthermore, if a so-called PI bolt, which has twin heads that break at a constant torque, is used as a bolt, it has great practical effects, such as being able to tighten with uniform tightening force without individual differences, without using any special tools.

[Brief explanation of the drawing]

FIG. 1 is an example of a front view of the electric wire gripping part according to the present invention, FIG. 2 is a side view of the same, and FIG. 3 is a perspective view showing an example of a bolt used for tightening in the present invention. 1... Clamp body, 2... Cap, 3... Hinge joint, 4... Electric wire, 5...
...Bolt, 6...Spring, 8...
- Angular process, 9... Plate-like body, 10...
Angular engagement part.

Claims (1)

[Scope of utility model registration request] In a wire gripping part using a nut cracker type clamp in which a wire is gripped by a clamp body with one end hinged and a cap, a bolt having a square projection at the tip is inserted into the clamp body via a resilient spring, and the cap is What is claimed is: 1. An electric wire gripping part, which is screwed into the cap, and has a angular protrusion protruding from the cap that engages with a angular engagement part of a plate-shaped body inserted from the side of the cap, thereby preventing self-rotation of the bolt.