JP2001069651A - Reverse compression anchor clamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely arrest torsional rotation of a clevis and thus eliminate the risk of dropping during work by forming the base of the clevis, so that the base has non-circular cross sections, and securing a detent cap with a noncircular cross-sectional hole corresponding to the cross-sectional shape of the base at the entrance to the center hole in the body of a clamp. SOLUTION: A base 4c of a clevis 4 to be inserted into a central hole having circular cross sections is so formed that the base has non-circular cross section and flat ground faces 4d, opposite each other in the direction of the diameter, on its periphery. At the entrance to the central hole, a detent cap 12 with a hole 11, having noncircular cross sections corresponding to the crosssectional shape of the base 4c formed at its central portion is secured. When the cylindrical portion of the body 3 of a clamp is deformed reverse-compressively the rotation of the clevis 4 is prevented by engagement between the hole 11 having a noncircular cross sections and the base 4c. Thus, the positioning of the clevis 4 in the direction of the rotation is stabilized, and untwisting of an anchor wire twisted on the anchor head 4b of the clevis 4, so-called 'kinking', is prevented. In addition, the possibility that the detent cap 12 is dropped off during compression work is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end clamp for holding a steel core aluminum stranded wire used as an electric wire or the like to a steel tower or the like.
Among the compression type retention clamps that fix steel core aluminum stranded wires by plastic deformation due to compression, the reverse compression type, which is called reverse compression, in which the wire is compressed sequentially from the wire side to the retention side to prevent laughter of the wire ( The present invention relates to an electric wire anchoring clamp.

[0002]

2. Description of the Related Art As shown in FIG. 4, an ordinary laughable anti-compression type clamping clamp used for retaining an electric wire is an aluminum clamp capable of introducing a steel core aluminum stranded wire 2A from the tip into a penetrated center hole 1A. A clevis 4A fixed to the distal end of the core steel wire 2a of the steel core aluminum stranded wire 2A is inserted into the base end 3a of the clamp body 3A,
The cylindrical portion 3b of the clamp body 3A and the joint tube 4a of the clevis 4A are externally compressed into a hexagonal section, for example. That is, the core steel wire 2a exposed from the aluminum stranded wire 2b of the steel core aluminum stranded wire 2A to be retained is inserted and compressed into the joint tube 4a of the clevis 4A, and the joint tube 4a having an uneven outer peripheral surface. In addition, due to the compression deformation of the cylindrical portion 3b of the clamp body 3A, the distal end of the steel core aluminum stranded wire 2A is integrated with the clamp body 3A and the clevis 4A.

[0003] An anchoring wire (not shown) guided from a steel tower or the like is hung on the anchoring head 4b of the clevis 4A located outside the clamp body 3A, and a joint is provided with the base end 3a of the clamp body 3A. A jumper stranded wire 7A that bypasses a steel tower or the like is fixed to the jumper socket 6A fixed with the bolt 5A.

In the compression operation of the above-mentioned laughing prevention type compression clamp, the compression of the aluminum clamp (clamp main body 3) cannot be performed at once because the compression portion has a certain length. From the side to the wire side. However, since such compression may cause so-called "laughing" to the electric wire, there is a method called "reverse compression", in which the electric wire is compressed from the electric wire side toward the retaining side. In the case of the reverse compression method, when the steel clamp (clevis 4A) is abutted against the aluminum clamp, the distance (L) between the aluminum clamp end and the steel clamp end, that is, the cotter portion, is considered in advance in consideration of the expansion due to the compression of the aluminum clamp. ) And set the steel clamp. Compression then begins, but as the compression twists, the wire twists back and the steel clamp also twists in the opposite direction to the steel core wire, so this twisting is generally avoided.

[0005]

In order to prevent such a "twisting phenomenon", a fixture for preventing the torsional rotational movement of the clevis 4A with respect to the clamp body 3A is disclosed in Japanese Utility Model Publication No. Sho.
No. 8-47796. That is, FIG. 5 shows a fixing tool 8A proposed in the publication, and this fixing tool 8A has a pair of hakama seats 8a that can be seated at the base end 3a of the clamp body 3A. An extension piece 8b projecting in a substantially horizontal direction is integrally formed on the upper part of the clevis, and a holding piece 8c capable of holding the retention head 4b of the clevis 4A is supported by the extension piece 8b.

Therefore, when such a fixing tool 8A is used, if the retaining head 4b of the clevis 4A is held between the holding pieces 8c, the clevis 4A which may be generated in the compression step of the cylindrical portion 3b of the clamp body 3A is formed. Although the "twisted state" can be prevented by preventing the torsional rotation, the fixing tool 8A may come off during the compression work, and there is a danger that the fixing tool 8A may be dropped when the fixing tool 8A is attached or detached in a suspended state.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problem of the conventional laughing prevention type compression clamp described above, and to completely prevent the clevis from twisting and rotating during the compression process of the clamp body. It is an object of the present invention to obtain a laughable anti-compression type compression clamp without danger of dropping.

[0008]

In order to achieve this object, the present invention provides a clevis fixed to an end of a core steel wire of a steel core aluminum stranded wire and an end of the aluminum stranded wire of the steel core aluminum stranded wire. The clevis has a non-circular cross-section and a non-circular cross-section corresponding to the cross-sectional shape of the clevis in a laugh-prevention-type compression-type retaining clamp that introduces a portion into a cylindrical clamp body and reverse-compresses the clamp body. It is an object of the present invention to provide a laughing prevention type compression clamp in which a detent cap having a hole is fixed to a center hole entrance of the clamp body.

In the following description of a preferred embodiment of the present invention, 1) an annular groove concentric with the center hole is formed in the clevis side end surface of the clamp body, and is formed in an "L" -shaped cross section. A structure in which a peripheral flange of the detent cap is inserted into the annular groove; 2) a plurality of detent cap fixing holes into which rivets can be inserted are formed in the clevis side end surface; A structure in which a recess for receiving the tip of the rivet is formed will be described.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is an enlarged sectional view of a main part of a laugh prevention type compression type retaining clamp according to the present invention,
As in the related art, a steel core aluminum stranded wire is introduced into the cylindrical portion 3b of the clamp body 3 made of a soft metal such as pure aluminum.

The cylindrical portion 3b of the clamp body 3
A clevis 4 fixed to the distal end of the core steel wire 2a of a steel core aluminum stranded wire is inserted from the base end 3a side, and a cylindrical portion 3b of the clamp body 3 and a joint tube 4a of the clevis 4 are provided, for example. A hexagonal section is sequentially compressed from the outside from the electric wire side.
That is, the core steel wire 2a of a steel core aluminum stranded wire to be stopped is inserted and compressed in advance into the joint tube 4a of the clevis 4, and the tube of the joint tube 4a and the clamp body 3 whose outer peripheral surface is made uneven. The distal end of the steel core aluminum stranded wire is integrated with the clamp body 3 and the clevis 4 by the reverse compression deformation of the shape portion 3b.

The base 4c of the clevis 4 inserted into the center hole 1 having a circular cross section has a non-circular cross section having a flat cut surface 4d diametrically opposed on the outer peripheral surface. A non-circular cross-section hole 11 conforming to the cross-sectional shape of the base 4c is fixed to a detent cap 12 formed at the center thereof. The engagement of the non-circular cross-section hole 11 and the base 4c causes the cylindrical shape of the clamp body 3 to be fixed. Clevis 4 during reverse compression deformation of part 3b
Is prevented from rotating.

More specifically, the detent cap 12 formed by bending a metal plate has a peripheral flange 12a extending in the axial direction on the outer peripheral surface, and is provided on the end surface of the base end 3a of the clamp body 3. The annular groove 13 for receiving the flange 12a is formed concentrically with the center hole 1. A plurality of mounting holes 15 into which small rivets 14 can be inserted are formed around the non-circular cross-sectional hole 11, and fixing holes 16 corresponding to these mounting holes 15 are formed in the end face of the base end 3a. It is.

At the entrance of the center hole 1, there is formed an annular hole 17 partially connected to each of the fixing holes 16, so that the rivets 14 are connected to the mounting holes 15 and the fixing holes 16 respectively.
Rivet 14, the tip of each rivet 14
As a result, the cap 12 is completely fixed to the clamp body 3 by these rivets 14.

As is apparent from the above description, according to the present invention, when the core steel wire 2a is inserted into the joint tube 4a of the clevis 4 and compressed, the steel core aluminum is inserted into the cylindrical portion 3b of the clamp body 3. The stranded wire is introduced, and the cylindrical portion 3 of the clamp body 3 is
By reversely compressing b from the outside, the steel core aluminum stranded wire is completely integrated with the clamp body 3 and the clevis 4. In the case of this compression processing, the clevis 4 rotates with respect to the clamp body 3 because the clevis base 4c is engaged with the non-circular cross-sectional hole 11 of the detent cap 12 fixed to the end face of the base end 3a. Cannot rotate, the position of the clevis 4 in the rotational direction is stabilized, and the clevis 4
The so-called "twisting phenomenon" in which the twist of the anchor wire wound around the anchor head 4b returns can be prevented.

In the case of the illustrated embodiment, the detent cap 12 is fixed to the clamp body 3 at the factory using the rivets 14, so that there is no danger that the detent cap 12 will be dropped off during the compression work. The cap 12 can be manufactured relatively inexpensively, and if the circumferential flange 12a is formed on the rotation stopper cap 12, the center hole 1 of the clamp body can be formed.
It is possible to prevent rainwater or the like from invading later.

[0017]

As is apparent from the above description, according to the present invention, the rotation of the clevis due to the twisting of the steel core aluminum stranded wire in the reverse compression step of the clamp body can be completely prevented, and the manufacturing can be performed at low cost. Since the detent cap is fixed to the clamp body with rivets or the like, it is possible to achieve a laugh prevention type compression type retaining clamp without danger of the detent cap being accidentally removed during the operation.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a laugh prevention type compression type clamping clamp according to the present invention.

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

FIG. 3 is an exploded perspective view of an essential part of the laugh prevention type compression type retaining clamp.

FIG. 4 is a partially cutaway front view of a conventional laugh prevention type compression type retaining clamp.

FIG. 5 is an exploded perspective view of a main part of another conventional anti-smile type compression type retaining clamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center hole 2a Core steel wire 3 Clamp main body 3a Base end 3b Cylindrical part 4 Clevis 4a Handle cylinder 4b Retention head 4c Base 11 Non-circular cross section hole 12 Detent cap 12a Peripheral flange 13 Annular groove 15 Mounting hole 16 Fixed Hole

Claims (3)

[Claims] 1. A clevis fixed to an end of a core steel wire of a steel core aluminum stranded wire and an end of the aluminum stranded wire of the steel core aluminum stranded wire are introduced into a cylindrical clamp body. In the laugh prevention type compression type retaining clamp for reverse compression processing, the base of the clevis has a non-circular cross-section, and a detent cap having a non-circular cross-sectional hole corresponding to the cross-sectional shape of the base is provided in the center hole of the clamp body. A laugh prevention type compression type clamping clamp characterized by being fixed. 2. An annular groove concentric with the center hole is formed in a clevis-side end surface of the clamp body, and a peripheral flange of the detent cap formed in an “L” -shaped cross section is formed in the annular groove. The laugh prevention type compression type retention clamp according to claim 1, which is inserted. 3. The clevis-side end face is formed with a plurality of fixing holes for fixing a detent cap into which a rivet can be inserted, and the center hole entrance inner face is formed with a gouge for receiving the tip of the rivet. Claim 1.
A laugh prevention type compression type retaining clamp according to claim 2 or 3.