JPH08280125A - Wire clamp - Google Patents

Abstract

PURPOSE: To enable adjustment of the tightening stroke of a push bolt by screwing the push bolt into the frame of a clamp body to push a turn buckle outward, thus setting push-out length to a sufficient value to provide a spring with a required preliminary compression force, and thereafter bringing a fastener into contact with the outside of the frame and anchoring it on the bolt. CONSTITUTION: A push bolt 7a is screwed from under the frame 21 of a clamp body, and a turn buckle 4 is thereby pushed upward by a specified length to preliminarily compress a coil spring 5 by a required amount of compression. After the preliminary compression of the coil spring 5 is set to a specified amount, a fastener 7b is screwed into the push bolt 7a until it reaches the underside of the frame 21 of the clamp body. Then the long groove in the push bolt is aligned with the through hole in the faster, and a pin 10 is inserted into them to join the bolt and the faster. This allows variations in the assembling dimensions of the clamp, and the push-in length of the push bolt 7a for preliminary spring compression to be freely set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire gripping clamp applied to a spring type boltless spacer clamp in an overhead power transmission line spacer clamp.

[0002]

2. Description of the Related Art An electric wire gripping clamp, particularly a spring type boltless spacer clamp, has a structure in which an electric wire 1 is sandwiched between a clamp body 2 and a clamp lid 3 hinged to the clamp body, as shown in FIG. Further, a tightening rod 4 and a spring 5 are provided to attract the clamp lid 3 and generate a clamping force on the electric wire 1.

The tightening rod 4 is T-shaped and is inserted into the frame portion 21 of the clamp body. The spring 5 is a coil spring and is inserted into the tightening rod 4 in the frame portion 21, one end of which is the frame portion. 21 is abutted against the inner surface of the tightening rod 21, and the other end is locked by a washer or a nut 6 which is provided at the end of the tightening rod 4, so that the elastic force for compression always causes the tightening rod 4 to generate an axial force in the tightening direction. . T-shaped head 4 of tightening rod 4
When 1 is locked to the open end side of the clamp lid 3, the clamp lid 3 is attracted by the axial force of the tightening rod 4, and thus the electric wire 1 is gripped by a predetermined tightening force.

By the way, in the spring type boltless clamp as described above, the compression margin of the spring 5 has a margin, and the tightening rod 4 is pushed outward while the spring 5 is sufficiently compressed as shown in FIG. By pushing it up), the head 41 of the tightening rod is lifted from the clamp lid 3, and at this point, the tightening rod 4 is moved to 9
When it is rotated 0 ° (the state shown in FIG. 5), the clamp lid 3
Is released from the locked state of the head portion 41 of the tightening rod, and can be expanded with the hinge joint portion as a fulcrum. By this expansion, it becomes possible to pinch the wire 1. Therefore, a preliminary compression work is required to compress the spring 5 before the electric wire is sandwiched.

A groove hole 31 that is opened in the lateral direction is formed on the open end side of the clamp lid 3, and the tightening rod 4 can be inserted into and taken out of the groove hole so that the clamp lid 3 can be inserted and removed from the side. It can be locked and released.

Conventionally, for pre-compression as described above, a push bolt 7'as shown in FIG.
The spring 5 is contracted from the outside, the tip of the push bolt is abutted against the end of the tightening rod 4, and the spring 5 is contracted by a certain length from that state so that the spring 5 is contracted by a certain amount.

Since the screw-in length of the push bolt is influenced by the variation in the assembly dimension which is inevitably generated in the clamp, it is difficult to determine the dimension in advance. Therefore, in the example of FIG. 5, in order to make the assembly dimensional accuracy of the clamp uniform, the outer surface of the bolt penetrating portion of the frame portion 21 of the clamp body is counterbored, and the push bolt 7 '(hexagon bolt ) Is completely tightened so that the screwed length = the length under the bolt.

FIG. 6 shows another example of precompression of the spring, which has a structure in which a long push bolt 7 "(hexagonal bolt) is not used to completely tighten it.

[0009]

In the above-described prior art spring pre-compression, when the constant length push bolt 7'as shown in FIG. 5 is used, the assembling dimensions of the individual clamps are made uniform. There is a factor of cost increase because it requires machining, and it is necessary to prepare bolts of several different lengths depending on the size of the electric wire.
Also, there was not much freedom in setting the tightening dimensions.

On the other hand, when the longer push bolt 7 "as shown in FIG. 6 is used, it is more cost-effective than the above-mentioned one, and the tightening length is arbitrarily set without completely tightening. It is possible to do so, after attaching to the electric wire, the push bolt is loosened as usual to remove it from the frame portion 21, but there is no problem, but if attachment is made again, the push bolt once removed must be tightened to compress the spring. Since the clamp lid cannot be removed from the T-shaped bolt, the push bolt 7 ″ may be too long at this time, which may cause excessive tightening, which may cause a problem such as damage to the screw portion. The present invention solves the above-mentioned problems of the prior art, and even if there are variations in the clamp assembly dimensions, the pre-compression of the spring by the push bolt can be reliably performed,
It is an object to provide a wire gripping clamp that has a margin of freedom in adjustment.

[0011]

SUMMARY OF THE INVENTION An electric wire gripping clamp provided by the present invention includes a clamp body having a frame portion, a clamp lid hinged to the clamp body, and an engaging / disengaging member on the open end side of the clamp lid. A tightening rod that is inserted into the frame of the clamp body, and a spring that is set to apply an axial force in the tightening direction to the tightening rod in the frame of the clamp body; Lock the push bolt that pre-compresses the spring while screwing it into the frame of the clamp body from the outside and pushing out the tightening rod to the outside, at the desired position of the push bolt body and the required length of the push bolt body. This is a combination with a stopper that can be brought into contact with the outer surface of the frame portion.

[0012] In a preferred embodiment, the stopper is screwed into the push bolt body, and a long groove or a long hole is provided for a required length of the push bolt main body. The long groove or the long hole is passed through the long groove or the long hole. It has pins that are skewered. The stopper is in the shape of a bolt head or a nut.

[0013]

According to the electric wire gripping clamp of the present invention, first,
By screwing the push bolt into the frame of the clamp body and pushing out the tightening rod to the outside, apply the necessary pre-compression force to the spring to set the extrusion length, and then apply the stopper to the outer surface of the frame of the clamp body. By locking the push bolt body in the contact state, it is possible to prevent further tightening of the push bolt body.

Therefore, by adjusting the tightening stroke of the push bolt body, variations in the assembly dimensions of the clamp can be allowed. Also, since the stopper is locked at a predetermined position of the push bolt body that is screwed in with the tightening stroke adjusted, and this is brought into contact with the outer surface of the frame portion of the clamp body, the spring is compressed and the clamp lid is opened. Prevents over-tightening of the push bolt when re-tightening the push bolt as when removing.

[0015]

FIG. 1 shows a preferred embodiment of an electric wire gripping clamp according to the present invention, and FIG. 2 shows a push bolt used in the electric wire gripping clamp.

In this embodiment, a spacer clamp is used as in the case of FIG. 4, and the same structure as that of FIG. 4 is used; Therefore, 2 is the clamp body, 2
1 is its frame, 3 is a clamp lid, 31 is its slot,
Reference numeral 4 is a T-shaped bolt serving as a tightening rod, 41 is a T-shaped head portion thereof, 5 is a coil spring as a spring, and 6 is a nut.

As shown in FIG. 2, the push bolt 7 used in the present embodiment is a combination of a headless push bolt main body 7a and a stopper 7b, which has a shaft portion and a head portion separated from each other. It is a thing. The stopper 7b is formed with a female screw so as to also serve as a nut structure, so that the stopper 7b can be screwed into the push bolt body 7a. Thus, the push bolt main body 7a is provided with a long groove 8 cut by a predetermined length from the position which is the rear end in the screwing direction. Further, the stopper 7b is provided with through holes 11, and a pin 10 (see FIG. 1) through which both holes are inserted in a skewered shape is prepared.

The procedure of the spring pre-compression using the push bolt 7 as described above will be described. First, the push bolt main body 7a is screwed in from the lower side of the frame portion 21 of the clamp main body, and the screwed tip, that is, the upper end is tightened with a tightening rod. The coil spring 5 is pre-compressed by a necessary compression amount by abutting against the bottom end which is the end of 4, and further pushing the push bolt main body 7a by a predetermined stroke and pushing the tightening rod 4 upward by a predetermined length. is there. When the pre-compression of the coil spring is set to a predetermined amount by absorbing the error in the assembly dimensions of the clamp, screw the stopper 7b into the push bolt 7a and tighten until it reaches the bottom surface of the frame portion 21 of the clamp body. The long groove 8 of the bolt main body and the through hole 11 of the stopper are aligned with each other, and they are joined together by a pin 10 in a skewered state to be integrated, and the shape is like a hexagonal bolt.

When the spring 41 is pre-compressed as described above, that is, when the T-shaped head 41 of the tightening rod is lifted, the head 41 is made parallel to the slot 31 of the flange lid. The locked state between the flange cover 3 and the flange cover 3 can be released, and the flange cover 3 can be freely opened and closed with the hinge connection portion serving as a fulcrum.

In the above embodiment, the elongated groove 8 is bored in the push bolt itself in order to allow the screwing adjustment of the push bolt 7a. However, the present invention is not limited to this, and the elongated hole may be used.

FIG. 3 shows another embodiment of the present invention in which the push bolt 7a 'is a hexagon headed bolt, and a long hole 9 for penetrating a pin is formed in the screw shaft portion. Also, the stopper 7
b'is shaped like a hexagonal nut and is screwed into the push bolt 7a '.

[0022]

According to the electric wire gripping clamp of the present invention as described above, the spring is pre-compressed while being screwed into the frame portion of the clamp body from the outside and pushing the clamp locking tightening rod to the outside. The push bolt is a combination of a push bolt main body and a stopper that can be locked at an arbitrary position corresponding to the required length of the push bolt main body and is brought into contact with the outer surface of the frame portion. By allowing the variation, the pushing length of the push bolt for pre-compressing the spring can be freely set.
Since the position of the stopper can be freely set, it is not necessary to align the push bolts having the lengths corresponding to the individual sizes. Since the push bolt main body and the stopper can be commonly used as a clamp corresponding to each size, it is advantageous in terms of cost. And so on.

[Brief description of drawings]

FIG. 1 is a front explanatory view showing an electric wire gripping clamp in a pre-compressed state in an embodiment of the present invention.

FIG. 2 is an explanatory view showing the push bolt in a disassembled state in the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a push bolt of another type in a disassembled state in the embodiment of the present invention.

FIG. 4 is an explanatory front view showing the electric wire gripping clamp in a regular tightened state after precompression is released.

FIG. 5 is a front explanatory view showing a wire gripping clamp in a pre-compressed state in a conventional example.

FIG. 6 is a principal part explanatory view showing a preliminary compression structure of an electric wire gripping clamp in another conventional example.

[Explanation of symbols] 1 wire 2 clamp body 3 clamp lid 31 groove hole 4 T-shaped bolt (tightening rod) 5 coil spring (spring) 6 nut 7 push bolt 7a push bolt body (without head) 7a 'push bolt body (head) Included) 7b Stopper (bolt head type) 7b 'Stopper (nut type) 8 Slot 9 Slot 10 Pin 11 Through hole

Claims (3)

[Claims] 1. A clamp main body having a frame portion, a clamp lid hinged to the clamp main body, and a tightening inserted in the frame portion of the clamp main body so as to be engageable with and disengageable from the open end side of the clamp lid. A rod and a spring set so as to apply an axial force in the tightening direction to the tightening rod in the frame portion of the clamp body, and further screwing the tightening rod into the frame portion of the clamp body from the outside. A push bolt that pushes outward and pre-compresses the spring is provided with a push bolt main body and a stopper that can be locked at an arbitrary position corresponding to a required length of the push bolt main body and is brought into contact with the outer surface of the frame portion. A wire gripping clamp that is a combination. 2. The stopper is screwed into the push bolt main body, and a long groove or a long hole is provided for a required length of the push bolt main body. The long groove or the long hole is passed through the long groove or the long hole and the stopper is skewered. The electric wire gripping clamp according to claim 1, wherein the electric wire gripping clamp has a pin. 3. The electric wire gripping clamp according to claim 1, wherein the stopper is in the shape of a bolt head or a nut.