JP3086761B2 - Wedge pusher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wedge pusher used to push a wedge of a wedge type clamp used for attaching an electric wire such as a transmission line to a steel tower into a clamp body.

[0002]

2. Description of the Related Art A wedge-type clamp is one in which a wedge body holding an electric wire is pressed into a clamp body to integrate the electric wire with the wedge-type clamp, and this is attached to a steel tower via an insulator (for example, a real open type). JP-A-52-29493).

Conventionally, an offset wedge pusher (hereinafter referred to as a pusher) as shown in FIG. 2 has been used for press-fitting a wedge body holding a wire into a crumb body. That is, this offset type pusher A is provided with pins 4 and 4 on the other ends of a pair of straps 3 and 3 having one ends connected to clevis portions 2 and 2 provided on both sides of the clamp body 1. It is provided detachably.

[0004] The pusher A includes a block 5 connected to the straps 3 and 3 by pins 4 and 4, a hydraulic cylinder 6 provided on one end surface side of the block 5, and a And a pressing piece 8 provided at the end of the drive shaft 7 protruding from the end face.

The pressing piece 8 has a notch 8a into which an electric wire W extending outward from the wedge body 9 is inserted, and the axis of the drive shaft 7 is aligned with the axis of the wedge body 9 (which coincides with the axis of the electric wire W). ) And a predetermined distance, that is, an offset L, so that the hydraulic cylinder 6 is not in contact with the electric wire W.

The hydraulic cylinder 6 is connected to a hydraulic pump P via a tube P ', and a drive shaft 7 is connected to a wedge 9
When moved in the direction, the wedge body 9 can be pushed (press-fitted) into the clamp body 1 via the pressing piece 8.

[0007] However, this offset type pusher a
Since there is an offset L between the axis position of the drive shaft 7 and the axis position of the wedge body 9, the drive shaft 7
Has the disadvantage that the force does not work efficiently.

Accordingly, the present applicant has previously disclosed in
In Japanese Patent Publication No. 74008, a double hydraulic cylinder type pusher B having no offset L as shown in FIG. 3 has been proposed.

FIG. 3 shows a double hydraulic cylinder type pusher B, in which the same components as those in FIG. 2 are denoted by the same reference numerals, and a description of these same components will be omitted. . On both sides of the block 5, the distal ends of the drive shafts 7a, 7b (not shown) of the pair of hydraulic cylinders 6a, 6b are fixed, respectively. The pair of hydraulic cylinders 6a, 6b are fixed to both sides of the pressing piece 8, respectively, and the axial direction of both hydraulic cylinders 6a, 6b (drive shafts 7a, 7b) and the wedge body 9 (electric wire L). They are arranged so that the axis direction is parallel to the axis direction.

Therefore, the double hydraulic cylinder type pusher B can press the wedge body 9 by the resultant force of the pair of hydraulic cylinders 6a and 6b, so that the pusher B of the offset type shown in FIG. Also, it becomes possible to push the wedge body 9 effectively.

FIG. 4 is a graph showing the relationship between the hydraulic cylinder pressure and the pushing force of the wedge member 9. As is apparent from this figure, the double hydraulic cylinder type pusher B is replaced with the offset type pusher I. This indicates that the wedge body 9 is pushed more effectively than the wedge body 9.

[0012]

However, the pusher of the double hydraulic cylinder type described above has the feature of being able to press the wedge efficiently, but requires a plurality of hydraulic cylinders, and the structure becomes complicated. There was a drawback that cost increased.

The present invention has been made in order to solve the above-mentioned drawbacks, and an object of the present invention is to provide a pusher having no offset with a single hydraulic cylinder.

[0014]

The pusher according to the present invention comprises:
In order to achieve the above object, a block detachably attached to a pair of straps provided on both sides of a clamp body, and an axial direction of a drive shaft coincides with an axial direction of a wedge body holding an electric wire. A hydraulic cylinder provided on the block, and a groove provided at one end at a tip of a drive shaft of the hydraulic cylinder, the other end abutting on a wedge body holding the electric wire, and the electric wire being inserted. And a pressing portion.

[0015]

In the above construction, when the hydraulic cylinder operates, the drive shaft is advanced toward the wedge body. The protruding drive shaft moves the pressing portion toward the wedge body and pushes the wedge body into the clamp body.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a use state of the pusher C according to one embodiment.

The same reference numerals are used for the same components as those in the conventional example shown in FIGS. 2 and 3, and the description of these components will be repeated, so that only the new portions will be denoted by different reference numerals.

In the figure, reference numeral 10 denotes a pressing portion, one end of which is fixed to a pressing piece provided at the tip of the drive shaft 7 of the hydraulic cylinder 6, and the other end of which is an end of the wedge 9. And the longitudinal axis is aligned with the axial direction of the drive shaft 7 and the wedge body 9 (the electric wire W). Therefore, the hydraulic cylinder 6
It is fixed to the central part of the block 5.

The pressing portion 10 has a groove 11 having a U-shaped cross section with an upper opening in the longitudinal direction, and the size of the groove 11 is determined so that the electric wire W can be sufficiently inserted. .

In order to push the wedge body 9 into the clamp body 1 with the pusher C according to the present embodiment, the wedge body 9 holding the electric wire W is inserted into the clamp body 1, and then the pusher C is connected to the strap 3, Set to 3. At this time, the electric wire W is
Into the groove 11 of

When the hydraulic cylinder 6 is driven by operating the hydraulic pump P (not shown in FIG. 1), the drive shaft 7 and the pressing portion 10 move in the direction of the arrow (the direction of the wedge body 9), and The body 9 is pushed into the clamp body 1.

When the pushing of the wedge body 9 is completed, the hydraulic pressure of the hydraulic cylinder 6 is released, and then the block 5 is detached from the straps 3 to terminate a series of clamping operations.

The pusher C according to the present embodiment not only requires a single hydraulic cylinder, but also has the same axial center direction of the drive shaft 7, the pressing portion 10, and the wedge body 9 and is shown in FIG. As described above, the pressing force of the hydraulic cylinder immediately becomes the pressing force of the wedge body 9, and the effective pushing without loss is possible.

In the above-described embodiment, since the electric wire (jumper wire) W projecting from the wedge body 9 faces upward, the opening of the groove 11 of the pressing portion 10 also faces upward. When the electric wire W is downward, the electric wire W is rotated so that the opening of the groove 11 is directed downward, and the electric wire W is inserted into the groove 11.

[0025]

The pusher according to the present invention has a block detachably attached to a pair of straps provided on both sides of the clamp body, and a drive shaft having an axial direction in which the wedge body grips the electric wire. A hydraulic cylinder provided on the block so as to coincide with one end of the drive shaft of the hydraulic cylinder, one end of which is provided at a distal end of the drive shaft, and the other end of the hydraulic cylinder is in contact with a wedge body holding the electric wire, and the electric wire is inserted. Since it is composed of the pressing portion having the groove, the structure is simple with a single hydraulic cylinder, and the pressure of the hydraulic cylinder can be used as the pushing force of the wedge without waste.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a clamp operation performed using a pusher according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a clamp operation using an offset type pusher.

FIG. 3 is a perspective view showing a clamping operation using a double hydraulic cylinder type pusher.

FIG. 4 is a graph showing a relationship between a hydraulic cylinder pressure and a wedge body pushing force.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clamp body 3 Strap 5 Block 6 Hydraulic cylinder 7 Drive shaft 8 Pressing piece 9 Wedge body 10 Pressing part 11 Groove C Pusher (wedge pusher)

Claims (1)

(57) [Claims] 1. A block detachably attached to a pair of straps provided on both sides of a clamp body, and a block attached to the block such that an axis direction of a drive shaft coincides with an axis direction of a wedge body holding an electric wire. A hydraulic cylinder provided, one end of which is provided at a tip end of a drive shaft of the hydraulic cylinder,
And a pressing portion having a groove on which the other end abuts the wedge body holding the electric wire and into which the electric wire is inserted, the wedge pusher.