JPH0343850B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to overhead line (e.g. electric wire) retaining clamps,
In particular, it relates to overhead wire retention clamps of the tightening type clamp style.

Conventional technology and its problems Conventionally, such a type of overhead wire retaining clamp has been used by screwing a sleeve-shaped male thread into the female threaded part of the casing through the insertion opening of the casing having a tapered hole on the inner circumferential surface, and inserting the clamp into the casing. The tightening type fastening fitting, which has a tapered outer circumferential surface and a grooved sleeve with a vertically divided circumferential wall, is moved to the opposite side of the tapered hole of the casing and tightened by the sleeve-shaped male thread, thereby tightening the tightening fitting. There is one in which the overhead wire passing through is tightened from the surrounding area. However, in this conventional type, the tightening type fastening fitting has a one-step taper type, so if an external force is applied to the tightening fitting through the tightened overhead wire in the direction of the taper, the tightening of the overhead wire will loosen. In some cases, the overhead wires became loose, and sometimes they came loose from the clamps. Moreover, such external force is unavoidably exerted on the tightening fitting due to the vibration of the overhead wire anchoring base such as the insulator arm caused by vehicle traffic and other factors, and when such vibration occurs, in many cases, the sleeve-shaped male screw Torque is applied in the circumferential direction of the insulator arm, which tends to loosen the sleeve-shaped external thread with respect to the casing connected to the overhead wire retaining base.

SUMMARY OF THE INVENTION The present invention aims to eliminate the drawbacks of the prior art described above, and to provide a tension clamp type overhead wire retaining clamp that can avoid loosening or coming off of the overhead wire even when the above-mentioned external force and torque are generated. There is.

Means for Solving the Problems It is an object of the present invention to provide an austerity system which is formed into a plurality of circumferentially independent divided pieces, or which is formed into a sleeve shape with vertical grooves on the peripheral wall, or which is a combination of these types. The locking member includes a locking member of the type, a sleeve-shaped casing serving as a nut for accommodating the locking member, and a threaded sleeve screwed into the female threaded portion of the casing, the outer circumferential surface of the locking member having a tapered shape symmetrically in the front and back, The casing has a tapered inner wall on one end of the predetermined side thereof, which corresponds to the taper of the outer circumferential surface of one half of the lock member, and the threaded sleeve has an inner wall with a reverse taper corresponding to the taper of the outer circumferential surface of the other half of the lock member. An overhead wire drawer characterized in that the inner circumferential surface of the inlet portion of the casing and the outer circumferential surface of the threaded sleeve at a portion corresponding to the inner circumferential surface of the casing are provided with mutually fitting grooves and a snap-spring type retaining ring. This is achieved by a fastening clamp.

Embodiments Next, embodiments of the present invention will be described with reference to the accompanying drawings.

The tightening type locking member 1 is a plurality of circumferentially independent divided pieces (types shown in Figs. 1, 2, and 3), or a sleeve-like structure with vertical grooves in the circumferential wall. or a composite of these forms (types shown in Figures 4, 5, and 6)
shall be. The vertical groove in the lock member 1 has a symbol 2.
is attached. The locking member 1 is housed in a sleeve-shaped casing 3. Further, the locking member 1 has a tapered shape that is symmetrical in the front and back on its outer peripheral surface.

The casing 3 is in the form of a nut, that is, it has an internal thread 4 on its inner circumferential surface. A tapered inner wall 6 corresponding to the taper 5 on the outer circumferential surface of the one-half side of the locking member 1 is formed at one end of the casing 3, that is, at the end opposite to the inlet side described below.

The threaded sleeve 7, which is screwed into the female thread 4 of the casing 3, has an inner circumferential surface 8 with a reverse taper corresponding to the taper 5 on the outer circumferential surface of the other half of the locking member 1. The screw sleeve 7 has a polygonal tightening head 7a.

A groove 10 is formed on either the inner circumferential surface of the overhead wire a insertion opening portion of the casing 3, that is, the inlet portion 9, or the outer circumferential surface of the threaded sleeve 7 at a portion corresponding to the inner circumferential surface of this portion.
On the other hand, a snap-spring type retaining ring 11 that fits into the groove 10 is provided. In the illustrated embodiment,
A groove 10 is provided on the inner circumferential surface of the inlet portion 9, and retaining rings 11 are provided at desired locations on the outer circumferential surface of the threaded sleeve 7. The retaining ring 11 may be of a split-ring snap-ring type, or may be of a snap-ring type in which one end side overlaps the other end side in the radial direction.

In the figure, the reference numeral 12 indicates a tooth portion having a serrated cross section and extending in the longitudinal direction of the inner surface of the locking member 1. As shown in FIG.

The manner in which the overhead wire is restrained by the clamp of the present invention in the illustrated embodiment is as follows.

The clamp attachment ring 13 provided on the casing 3 is connected to the insulator arm etc. overhead line retaining base 14 with a bolt (not shown), and the casing 3 is
Insert the overhead wire a from the overhead wire insertion port. Prior to the insertion of the overhead wire a, a locking member 1 is inserted into the casing 3, and a threaded sleeve 7 is previously fitted onto the overhead wire a (see FIG. 1).

After the above-mentioned insertion of the overhead wire a, the threaded sleeve 7 is screwed into the female thread 4 of the casing 3. Then, as the screw sleeve 7 screws in, the lock member 1
is moved to the anti-expansion side of the tapered inner wall 6 of the casing 3, and one half of the locking member 1 is contracted toward the overhead wire a by the inclined cam-like action of the taper 5 thereon and the tapered inner wall 6 of the casing 3, and the lock is With the upward movement of the threaded sleeve 7 relative to the member 1, the other half of the locking member 1 is tightened on the side of the overhead wire a under the action of an inclined cam by its taper 5 and the tapered inner circumferential surface 8 of the threaded sleeve 7; The locking member 1 tightens the overhead wire a from the periphery in two stages, front and rear, on one half side and the other half of the member 1 (FIG. 2).

According to a predetermined design, when this tightened state is achieved, a snap-spring-type retaining ring 11 is fitted into the groove 10, thereby preventing the threaded sleeve 7 from coming off against the casing 3.

In the above-described tensioned state of the overhead wire, even if an external force is applied to the locking member 1 through the overhead wire a to either the left side or the right side in FIG. However, tighter austerity was applied to the overhead line a
Ensure tightness. This is because the outer circumferential surface of the locking member 1 is a tapered type that is symmetrical in the front and back, and the tapered inner wall 6 corresponding to the taper 5 on one half of the outer circumferential surface of the member 1 is placed at a predetermined portion of the casing 3, and the taper 5 on the other half This is because an inversely tapered inner circumferential surface 8 corresponding to this is formed at a predetermined portion of the threaded sleeve 7.

On the other hand, since the threaded sleeve 7 is placed against the casing 3 to prevent it from coming off, even if torque is applied in the circumferential direction, the screwing into the casing 3 will not loosen.

Effects of the Invention As described above, according to the present invention, even if an external force toward the taper base side of the lock member or a torque in the circumferential direction of the threaded sleeve is generated, loosening or detachment of the overhead wire can be avoided. A tension clamp style catenary tie clamp can be provided.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the present invention before the overhead wire is tightened, FIG. 2 is a partial vertical cross-sectional view of the embodiment shown in FIG. 1 with the overhead wire tightened, and FIG. 3 is the same. FIG. 4 is a longitudinal sectional view showing a modified example of the lock member, FIG. 5 is a plan view thereof, and FIG. 6 is a side view of the lock member in the embodiment. 1...Lock member, 2...Vertical groove, 3...Casing, 4...Female thread, 5...Taper, 6...
Tapered inner wall, 7...Threaded sleeve, 8...Tapered inner peripheral surface, 9...Casing inlet, 10...
Groove, 11...Retaining ring.

Claims (1)

[Claims] 1. A tightening type locking member which is formed into a plurality of circumferentially independent divided pieces, or which is formed into a sleeve shape with vertical grooves in the peripheral wall, or which is a combination of these types, and which is a nut that accommodates the locking member. The locking member includes a sleeve-shaped casing and a threaded sleeve screwed into the female threaded portion of the casing, the outer peripheral surface of the locking member is tapered symmetrically in the front and back, and the casing has one half of the locking member at one end on a predetermined side thereof. The threaded sleeve has a tapered inner wall corresponding to the taper of the outer circumferential surface of the side, and the threaded sleeve has an inner circumferential surface of a reverse taper corresponding to the taper of the outer circumferential surface of the other half of the locking member. 1. An overhead wire retaining clamp, characterized in that a groove and a snap-spring type retaining ring that fit into each other are provided on the outer circumferential surface of the threaded sleeve at a portion corresponding to the inner circumferential surface of the section.