JPH09322366A - Attachment for protecting electric contact surface of anchor clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to utilize plywoods, which covers an electric contact surface of a jumper socket mounting part so as not to impair the electric contact surface when a metal wheel passes, as they are shipped from factory. SOLUTION: The external circumference of steel sleeve S which crimps a steel core wire W is covered by an aluminum sleeve AT at a jumper socket mounting part and plywoods 4 are temporarily secured to the electric contact surface of the aluminum sleeve. This attachment is made up of semicircular attachments 1, 2, pivotally provided with a pin 3 at one end, to which strip reinforcing plates la, 2a are fixed. When both semicircular attachments are closed, the attachment makes is possible for both reinforcing plates to press the plywoods 4. Because there is a bolt hole passing through the aluminum sleeve near the handle of the steel sleeve, a hole corresponding to it is drilled on both plates to prevent the movement of the protecting attachment by a piercing bolt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retractable clamp that allows passage of a gold wheel without a protector in a prefabricated wire drawing method using a steel core aluminum stranded wire, and a jumper socket mounting portion when passing through the gold wheel. It protects the electrical contact surface.

[0002]

2. Description of the Related Art In a conventional prefabricated wire-drawing method, a protector is attached to a retracting clamp so as to withstand a bending moment when passing through a metal wheel. . The tip of the steel sleeve is located beyond the center of the entire length of the strain clamp, and the steel sleeve mainly receives the bending moment applied to the strain clamp when passing through the rail wheel. In addition, the mouth of the aluminum sleeve is shaped like a trumpet to prevent the aluminum wire from breaking. Although this configuration solves the main problem without the protector, it does not prevent the electric contact surface of the jumper socket mounting portion from being damaged when the towing clamp comes into contact with the money wheel. It is clear that even a minute scratch has a negative effect on the conductive performance between the jumper socket and the jumper socket after passing through the gold wheel. Countermeasures for this have been left as important issues.

[0003]

[Means for Solving the Problems] The importance of protecting the electrical contact surface is well known among the people involved, and at the factory, the entire electrical contact surface is covered with a veneer plate before shipment, and this is covered with vinyl tape. It has been handed down from the past. The veneer plate was used as it was, and it was pressed and held by the protective metal fittings described below. This protective metal fitting is a pair of semi-circular metal fittings that can hold the jumper socket mounting part. One end can be pivotally attached and the other end can be closed. When the gold is fixed and the free end is closed, the gold presses the electroplating surface using the veneer plate as a cushioning material. The strip metal may be formed by integrally forming both semi-circular metal fittings. The detention clamp has a hole through the steel and aluminum sleeves near the handle of the steel sleeve. Corresponding to this hole, a through hole is provided in the above-mentioned metal fitting so that a bolt can be easily inserted, and the insertion bolt prevents the metal fitting from being displaced in the axial direction.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings will first be described with reference to the subject detention clamp. As shown in FIGS. 5 and 6, the detention clamp is composed of a steel sleeve S, an aluminum sleeve A, and a jumper socket J to be mounted after passing through the gold wheel. A steel core wire W is crimped to the steel sleeve. Since there is an annular gap between the steel sleeve S and the aluminum sleeve A at the jumper socket mounting part, this is an aluminum color C consisting of two split members.
It is filled and reinforced with. The four bolts B1 are in contact with the steel sleeve in the cutting line direction, and the single bolt B2 on the pulling side can penetrate the jumper socket J, the aluminum sleeve A, the aluminum collar C, and the steel sleeve S. The jumper sleeve is not assembled during the wire drawing work, and has only the bolt holes B1 and B2. The protective metal fittings used for this purpose are shown in Figs.
As shown in Fig. 1, one end is pivotally attached by a pin 3 and the other end is composed of a pair of semi-circular metal fittings 1 and 2 which can be closed.
When a and 2a are fixed together and closed at the free end,
As described above, the metal plates 1a and 2a press the both electrical contact surfaces of the aluminum sleeve via the veneer plate 4. Through holes 1 corresponding to the above bolt holes B2 are formed in the corresponding metal parts 1a and 2a.
b and 2b are bored, and the insertion bolt prevents axial displacement of the protective fitting. For the free ends of the semi-circular metal fittings 1 and 2,
FIG. 3 exemplifies a case in which engaging notches 1c and 2c are provided at both end edges facing each other, and a double-ended metal fitting (not shown) having a corresponding shape is fitted and tightened and locked. This protective metal fitting is mounted on the pulling clamp on the ground, and is removed together with the veneer plate 4 after passing through the gold wheel. The removal work will be an airborne work in high places,
Since it is a short length and light weight removal, it cannot be compared with the harsh work of the conventional protector removal.

[0005]

EFFECTS OF THE INVENTION It is possible to completely protect the electrical contact surface without a protector. A protective plate such as a veneer plate attached to this surface before factory shipment can be effectively used as a cushioning material even during the wire drawing work.

[Brief description of drawings]

FIG. 1 is a side view of a protective fitting.

FIG. 2 is a front view of the same.

FIG. 3 is a perspective view of a free end portion of the metal fitting.

FIG. 4 is a cross-sectional view when the metal fitting is used.

FIG. 5 is a front view of a tension clamp.

FIG. 6 is a side view of the same.

FIG. 7 is a front view of a steel collar.

[Explanation of symbols]

 1, 2 Semi-circular metal fittings 1a, 2a Gold 3 pin 4 Veneer plate S Steel sleeve W Steel core A Aluminum sleeve J Jumper socket C Aluminum color B1, B2 bolt

Claims (1)

[Claims] 1. In a money wheel passing type detention clamp, a jumper socket mounting portion in which a buffer plate is temporarily fixed to the entire electric contact surface is taken as a countermeasure, and the mounting portion can be held and one end is pivotally attached and the other end is It consists of a pair of semi-circular metal fittings that can be closed, and a metal plate that can press the entire surface of the electrical contact surface via the buffer plate is fixed to the corresponding positions of both semi-circular metal fittings. And a bolt hole that penetrates the aluminum sleeve is drilled,
The metal fittings for protecting the electrical contact surface of the pulling clamp are characterized in that the both dowels have through holes that can communicate therewith.