JP2003319542A - Retention clamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retention clamp which does not loose a holding force even if a cable being held is applied with a back tension. <P>SOLUTION: A retention clamp 1 comprises a connection lever 9 connected to a cam member 6, to move the cam member 6 comprising a movable cable presser 4 between a cable holding position and a cable releasing position. Thanks to a cam non-return mechanism 30 provided with a cam non-return pin 31 which engages with a pin insert hole formed at the connection lever 9, the connection lever 9 and the cam member 6 are held at the cable holding position. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining clamp used for retaining a cable on a utility pole.

[0002]

2. Description of the Related Art Conventionally, when performing an overhead uninterruptible construction method, an emergency cable, that is, a bypass cable is stretched over a utility pole. At that time, the cable end is pulled to support the cable itself. It is fixed to a utility pole via a retaining clamp.

An example of the retaining clamp is a wire gripper disclosed in Japanese Utility Model Laid-Open No. 63-153708. An example thereof is shown in FIG. 8 and briefly described as follows.

The wire gripper, that is, the retaining clamp 1 has a fixed cable retainer 3 and a movable cable retainer 4 provided on the clamp body 2. The clamp body 2 has an operating lever 6 whose one end is pivotally mounted on a pivot shaft 5. The movable cable retainer 4 is attached to the operating lever 6 by a pivot 7. The other end of the operating lever 6 is connected to the connecting lever 9 by a pivot 8.

With this structure, the connecting lever 9 is pulled to the right side in FIG. 8 in the direction of arrow a by a wire tensioner (not shown) or the like, so that the operating lever 6 is pivoted in FIG. Rotate around 5 in the direction of arrow b in the counterclockwise direction.
As a result, the movable cable retainer 4 moves in the direction of the arrow c toward the fixed cable retainer 3, and fixedly holds the cable 100 inserted between the fixed cable retainer 3 and the movable cable retainer 4.

[0006]

However, according to the results of the research and experiment conducted by the present inventors, in the retaining clamp 1 having the above-described configuration, the cable 100 is pulled.
The cable 100 can be suitably gripped when the cable 100 is acting, but when back tension acts on the cable 100, that is, when a force acts on the cable 100 in the direction of arrow d, Actuating lever 6 is pivot 5
The center of rotation is easily rotated clockwise in FIG. 8 in the direction opposite to the direction of the arrow b, the cable gripping force is loosened, and in some cases, the cable 100 may drop from the retaining clamp 1. There is.

Further, when releasing the cable grip while the cable 100 is under tension, the conventional holding clamp 1 needs to be operated with both hands, which is a problem in terms of workability. . In addition, it is problematic in safety to use both hands for the work of releasing the cable grip at the time of work at a high place.

Therefore, the object of the present invention is to provide a back tension even when the cable being gripped is subjected to back tension.
An object of the present invention is to provide a retaining clamp whose gripping force does not loosen.

Another object of the present invention is to eliminate the need to operate the holding clamp with both hands to release the cable grip,
It is an object of the present invention to provide a holding clamp that can release the cable grip with one hand, has extremely good workability, and is significant from the viewpoint of safety.

[0010]

The above objects are accomplished by a retaining clamp according to the present invention. In summary, according to one aspect of the invention, a cable is gripped between a fixed cable retainer on a clamp body and a movable cable retainer on a cam member pivotally mounted on the clamp body. In the retaining clamp, in order to swing the cam member between a cable gripping position and a cable releasing position, a connecting lever connected to the cam member and the cam member at the cable gripping position And a cam return prevention mechanism having a cam return prevention pin that engages with a pin insertion hole formed in the connecting lever. According to one embodiment, the cam member has a cable grip release finger hook pin for moving the cam member to the cable release position.
According to another embodiment, there is a spring means for urging the cam member towards the cable gripping position. Further, according to another embodiment, each of the fixed cable retainer and the movable cable retainer has a semicircular cross section, and a rubber sheet is attached to a surface for gripping the cable.

According to another aspect of the present invention, a cable is gripped between a fixed cable retainer provided on the clamp body and a movable cable retainer provided on a cam member pivotally provided on the clamp body. In a retaining clamp, a connecting lever connected to the cam member for swinging the cam member between a cable gripping position and a cable releasing position, and a cable for swinging the cam member to the cable releasing position. A detent clamp according to claim 1, having a finger-holding pin for releasing the grip. According to one embodiment, it comprises spring means for urging the cam member towards the cable gripping position. According to another embodiment, each of the fixed cable retainer and the movable cable retainer has a semicircular cross section, and a rubber sheet is attached to a surface for gripping the cable.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a retaining clamp according to the present invention will be described in more detail with reference to the drawings.

FIG. 1 shows an embodiment of a retaining clamp according to the present invention.

The retaining clamp 1 of this embodiment shown in FIG.
8 is upside down from the conventional retaining clamp shown in FIG. 8, the overall configuration of the retaining clamp 1 is similar to that of the conventional retaining clamp, and the clamp body 2
And an actuating lever, that is, a cam member 6, which is pivotally attached to the clamp body 2 by a pivot shaft 5.

A fixed cable retainer 3 extending over a predetermined length is integrally formed at the lower end of the clamp body 2. As will be understood by also referring to FIG. 2, the fixed cable retainer 3 has a semicircular cross section, and an elastic member, for example, a rubber sheet 3a is attached to the inner surface thereof. This structure prevents the cable covering layer from being scratched.

The clamp main body 2 extends upward from the fixed cable retainer 3 to form first and second arm portions 2A,
2B is formed, and the cam member 6 is attached to the first arm portion 2A.

In this embodiment, the cam member 6 has a substantially L shape, and one end 6A of the L shape has the first arm portion 2 of the clamp body 2.
It is attached to A by a pivot 5.

More specifically, as shown in FIG. 2, a cylindrical spacer 10 is arranged between the end portion 6A of the cam member 6 and the first arm portion 2A of the clamp body 2. In this embodiment, the spacer 10 is integrally fixed to the clamp body 2. In the pivot 5, the shaft portion 5a is provided so as to penetrate the cam member end portion 6A, the spacer 10 and the clamp body first arm portion 2A, and the cam member 6 is formed by the head portions 5b formed at both ends of the shaft portion 5a. , The spacer 10 and the clamp body 2 are sandwiched, and the cam member 6 is pivotally held with respect to the spacer 10 and the clamp body 2.

Further, in this embodiment, a recess 10a is formed in the spacer 10 around the shaft portion 5a of the pivot 5, and a coil spring 11 as a spring means is provided in the recess 10a and around the shaft portion 5a. Are placed. One end 11a of the coil spring 11
Is attached to the spacer 10, and the other end 11b is attached to the cam member 6. Thereby, the cam member 6
Is biased in the counterclockwise direction in FIG.

One end 9A of the connecting lever 9 is rotatably attached to the other end 6B of the L-shaped cam member 6 by a pivot 8. As shown in FIG. 3, the pivot 8 has a shape in which a head portion 8b is formed at both ends of a shaft portion 8a, and the shaft portion 8a penetrates the other end 6B of the cam member 6 and one end 9A of the connecting lever 9. The cam member 6 and the connecting lever 9 are sandwiched by the head portions 8b provided on both ends of the shaft portion 8a, and the cam member 6 and the connecting lever 2 are pivotally held to each other.

Further, as shown in FIGS. 1 and 2, the L-shaped bent portion 6C located between the both ends 6A and 6B of the cam member 6 has a support arm 12 for the movable cable retainer 4.
Is rotatably mounted on the pivot 7.

The movable cable retainer 4 is located above the fixed cable retainer 3 and extends substantially in parallel. The movable cable retainer 4 also has a semicircular cross section,
An elastic member such as a rubber sheet 4a is attached to the inner surface. Fixed cable holder 3 and movable cable holder 4
Cooperate to hold the cable 100 inserted between them.

The support arm 12 is a parallel support plate extending upward to the outside of the semicircular movable cable retainer 4, and the bent portion 6C of the clamp body 6 is inserted and arranged between the parallel support plates 12. , Rotatably mounted on the pivot 7. As shown in FIG. 2, the pivot 7 has a shape in which a head portion 7b is formed at both ends of a shaft portion 7a, and the shaft portion 7a is provided so as to penetrate the parallel support plate 12 and the cam member bending portion 6C. Part 7
The parallel support plate 12 and the cam member 6 are sandwiched by the heads 7b formed at both ends of the parallel support plate 12 and the cam member 6.
Hold each other pivotally. Therefore, as described above, the movable cable retainer 4 is swingable around the pivot 7 with respect to the cam member 6.

A guide member 20 is provided on the second arm portion 2B of the clamp body 2. The guide member 20 has a support plate 21, the support plate 21 is arranged in parallel with the clamp body 2, and a gap is provided between the support plate 21 and the second arm portion 2B. That is, one end (lower end in FIG. 1) of the support plate 21 is fixed to the clamp body second arm portion 2B by the connection plate 22, and the other end (upper end in FIG. 1) is clamped via the column member 23. Main body second arm 2
It is fixed to B.

A connecting lever 9 is disposed so as to pass through the space formed between the guide member 20 and the second arm portion 2B.
However, in the present embodiment, the guide plate 24 is provided for adjusting the amount of space between the second arm portion 2B of the clamp body and the support plate 21 to reduce play when the connecting lever 9 moves. .

Therefore, the connecting lever 9 can be moved substantially along the longitudinal axis direction of the connecting lever 9, but the guide member 20 allows the cable gripping position (I) shown by the solid line to be shown as shown in FIG. ) And the cable release position (II) indicated by the alternate long and short dash line.

In the retaining clamp 1 having the above structure, one of the characteristic structures of the present invention is to have a cam return preventing mechanism.

As shown in FIG. 4, the cam return prevention mechanism 30 has a cam return prevention pin 31 screwed to the support plate 21 of the guide member 20. From the right side in FIG. 4, the cam return prevention pin 31 includes an operation knob portion 32, a neck portion 33 having a smaller diameter than the knob portion 32, and a screw shaft portion 34 that is screwed into a screw groove 21 a formed in the support plate 21. And a pin portion 35 having a smaller diameter than the screw shaft portion 34. A stop pin 36 is provided at the tip of the pin portion 35 so as to be diametrically penetrated through the pin portion 35 and fixed. Therefore, even if the cam return prevention pin 31 is moved to the right in FIG. 1, the stop pin 36 abuts the support plate 21 to prevent further movement to the right, and the cam return prevention pin 31 is prevented. Prevention pin 3
1 does not come off from the support plate 21.

As will be understood by referring to FIG. 6 showing the state in which the support plate 21 is removed, the connecting lever 9 has a pin portion 35 when the cam return prevention pin 31 is moved toward the connecting lever 9. A pin through hole 9C that engages is formed.
The pin through hole 9C may have any shape, but in this embodiment, it has an elliptical shape.

The operation of the retaining clamp 1 of the present invention having the above structure will be described.

When the cable 100 is gripped by the retaining clamp 1 of this embodiment, first, the cam return prevention pin 3
1 is turned to move the cam return prevention pin 31 to the right in FIG. 4, and the pin portion 35 releases the engagement with the pin insertion hole 9C. This allows the connecting lever 9 to freely move in the longitudinal axis direction of the connecting lever 9 in the space formed by the guide member 20 and the cam body 2.

The connecting lever 9 is moved to the cable releasing position (II) in FIG. 5, and the cam member 6 is swung around the pivot 5 in the arrow direction (clockwise direction). As a result, the movable cable retainer 4 is separated upward from the fixed cable retainer 3, and the cable 100 is searched between the movable cable retainer 4 and the fixed cable retainer 3.

Next, the connecting lever 9 is moved to the cable gripping position (I) in FIG. 5, and the cam member 6 is swung in the counterclockwise direction around the pivot axis in the direction opposite to the arrow. As a result, the movable cable retainer 4 moves toward the fixed cable retainer, and the cable 100 is sandwiched and held between the movable cable retainer 4 and the fixed cable retainer 3.
This state is the state shown in FIG.

In this state, the cam return prevention pin 31 is screwed in the direction of the connecting lever 9 to obtain the state shown in FIG.
As a result, the cam return prevention pin 31 has its pin portion 3
5 engages with the pin through hole 9C of the connecting lever 9 to fix the connecting lever 9 in that position.

At this time, it is important to confirm whether the pin portion 35 of the cam return prevention pin 31 is completely engaged with the pin insertion hole 9C. According to the present embodiment, it can be determined whether or not the screw shaft portion 34 formed adjacent to the neck portion 33 of the cam return prevention pin 31 can be seen on the outer side portion of the support plate 21.

In other words, in the retaining clamp 1 of the present invention, it is possible to visually confirm the screw shaft portion 34 to confirm whether or not the cam return prevention pin 31 is completely functioning, and the workability is extremely high. Good.

Therefore, an arrow X is attached to the cable 100 sandwiched between the movable cable retainer 4 and the fixed cable retainer 3.
Even if the back tension as shown in (FIG. 1) is applied, the connecting lever 9 is fixed by the cam return preventing pin 31, so that the cam member 6 swings clockwise around the pivot 5 in FIG. It does not move. That is, the cable clamping force between the movable cable retainer 4 and the fixed cable retainer 3 does not loosen.

Another feature of the present invention is that it is provided with a finger-holding pin for releasing the cable grip.

That is, according to another feature of the present invention, as can be understood with reference to FIGS. 1, 3 and 7, a finger gripping pin 40 for releasing the cable grip is provided on the upper side of the cam member 6 in the drawing. It is provided.

As shown in FIG. 1, in the retaining clamp 1 holding the cable 100, when the cable is released after the work is completed, first, the cam return prevention pin 31 is released.
Is rotated and moved to the right in FIG. 4, and the engagement between the pin portion 35 and the pin insertion hole 9C is released. This allows the connecting lever 9 to move in the longitudinal axis direction of the connecting lever 9.

However, when the cable 100 is under tension, the cam member 6 does not rotate in the arrow Y direction as shown in FIG.

Therefore, in such a case, according to the present invention, as shown in FIG. 7, a finger is put on the cable grip release finger-hanging pin 40 to resist the spring force of the coil spring 11 and the cam. By pushing the member 6 around the pivot 5 in the arrow Y direction (clockwise direction), the cable clamping force between the movable cable retainer 4 and the fixed cable retainer 3 can be easily relaxed, and the cable 100 is retained and clamped. Can be removed from 1.

According to the above construction, it is not necessary to operate the holding clamp 1 with both hands to release the cable grip,
The cable grip can be released with one hand, and the workability is extremely good. In particular, being able to do it with one hand instead of using both hands when working at height is also meaningful in terms of safety.

[0044]

As described above, according to the present invention, the cable is gripped between the fixed cable holder provided on the clamp body and the movable cable holder provided on the cam member rotatably provided on the clamp body. In the retaining clamp, (A) in order to swing the cam member between the cable gripping position and the cable releasing position, a connecting lever connected to the cam member, and a state where the cam member is located at the cable gripping position, By providing a cam return prevention mechanism having a cam return prevention pin that engages with a pin passing hole formed in the connecting lever, even when back tension acts on the grasped cable, A connecting lever connected to the cam member for swinging the cam member between the cable gripping position and the cable releasing position without loosening the gripping force, and (B), The cable grip release finger hook pin for swinging the cable member to the cable release position and the cable holding release pin do not need to be operated with both hands to release the cable grip. The grip can be released, workability is extremely good, and it is also significant from the viewpoint of safety.

[Brief description of drawings]

FIG. 1 is a front view of an example of a retaining clamp according to the present invention.

2 is a cross-sectional view taken along the line II-II in FIG.

3 is a cross-sectional view taken along the line III-III in FIG.

4 is a cross-sectional view taken along line IV-IV in FIG.

5 is a front view for explaining a cable gripping position and a cable releasing position in the retaining clamp of FIG. 1. FIG.

6 is a front view of the retaining clamp of FIG. 1 with the support plate removed.

FIG. 7 is a front view for explaining a mode of swinging the cam member to the cable releasing position by using the finger gripping pin for releasing the cable grip in the retaining clamp of FIG. 1.

FIG. 8 is a front view showing an example of a conventional retaining clamp.

[Explanation of symbols]

1 Retaining clamp 2 Clamp body 3 Fixed cable holder 4 movable cable holder 9 Connection lever 11 coil spring 20 Guide member 21 Support plate 30 Cam return prevention mechanism 31 Cam return prevention pin 40 Finger hook pin for releasing cable grip

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Claims (7)

[Claims] 1. A retaining clamp for gripping a cable between a fixed cable retainer provided on a clamp body and a movable cable retainer provided on a cam member pivotally provided on the clamp body, wherein the cam member is provided. To swing between the cable gripping position and the cable releasing position, a connecting lever connected to the cam member, and a state in which the cam member is located at the cable gripping position,
And a cam return prevention mechanism having a cam return prevention pin that engages with a pin insertion hole formed in the connecting lever. 2. The holding clamp according to claim 1, wherein the cam member has a finger grip pin for releasing a cable grip for swinging the cam member to a cable releasing position. 3. The retaining clamp according to claim 1, further comprising spring means for urging the cam member toward a cable gripping position. 4. The fixed cable retainer and the movable cable retainer each have a semicircular cross section, and a rubber sheet is attached to a surface for gripping the cable. Retaining clamp. 5. A retaining clamp for gripping a cable between a fixed cable retainer provided on a clamp body and a movable cable retainer provided on a cam member pivotally provided on the clamp body, the cam member comprising: A connecting lever connected to the cam member for swinging the cable between a cable gripping position and a cable releasing position, and a cable gripping release finger hook pin for swinging the cam member to the cable releasing position. The retention clamp according to claim 1, wherein: 6. The retaining clamp according to claim 5, further comprising spring means for urging the cam member toward a cable gripping position. 7. The retainer according to claim 5, wherein the fixed cable retainer and the movable cable retainer have a semicircular cross section, and a rubber sheet is attached to a surface for gripping the cable. Clamp.