JPH06133435A - Cable clamp - Google Patents

Abstract

PURPOSE:To provide a cable clamp with which the discrepancy between the cable sheath and the inner core of an aerial cable can be eliminated and the cable can be anchored to a pole or the like directly with a sufficient tension. CONSTITUTION:After a fixing table 1 is fixed to a pole or the like on which an aerial cable 8 is installed with an assembling band 10, the cable 8 is wound around a cable winding drum 2 with 2-3 turns. While the end side of the cable is held, the drum 2 is turned with a handle 7 attached to the drum 2 to tighten the cable 8 with a required tension. After the tightening is finished and when a rotation stop pin insertion hole 5 on the fixing table 1 and the fixing hole 2b of the cable winding drum 2 are aligned with each other, a rotation stop pin 6 is inserted to block the rotation of the cable winding drum 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamp for retaining an overhead cable.

[0002]

2. Description of the Related Art Conventionally, in order to retain an aerial cable, particularly an optical cable, on a utility pole, etc., a tension is not applied to the cable body by directly pulling it by attaching a grip wrapped around a suspension wire and fixing it to the utility pole. I often did

Further, in the case of a route change due to the relocation of electric poles, etc., in order to achieve the effective use of the optical cable in the switching work and the shortening of the line down time at the same time, the existing optical cable is removed and re-installed. It may be effective to use a portable temporary optical cable as a bypass cable and simply lay it, but in this case, it is often the case that the round optical cable is directly retained so that excessive tension is not applied. Is required to

As a method of directly holding the round cable, a method of applying a winding grip to the cable and a method of using a wedge type clamp are known.

FIG. 4 is an explanatory view of a conventional retaining method using a wedge clamp. In the figure, 8 is a cable, 20 is a wedge type clamp, 21 is a rope, 22 is a pillar band, and 23
Is a telephone pole. As for the holding method, the wedge-shaped clamp 20 is used to sandwich and hold the cable 8.
It is a method of fixing the other end of the rope 21 attached to 0 to the pole band 22 fastened to the telephone pole 23.

A method using such a wedge type clamp,
When the round cable is directly held by the method using the winding grip, the cable is only gripped from the top of the sheath.Therefore, when the tension of tension becomes large, the sheath and the inner core may be misaligned. It was

Since the length of the portion where the cable is gripped is short, a force is locally applied to the cable.
Particularly, in the optical cable, there is also a problem that this external force may be applied to the inner core as a lateral pressure or a tensile force to increase the transmission loss.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and when the overhead cable is directly retained on a utility pole or the like, a shift occurs between the cable sheath and the inner core. It is an object of the present invention to provide a cable clamp that can be pulled with a sufficient tension without any trouble.

[0009]

DISCLOSURE OF THE INVENTION In a cable clamp, the present invention provides a fixing base for fixing to a support, a shaft provided on the fixing base, and a cable wrapping rotatably mounted on the shaft. It is characterized by having a drum and a locking means for preventing the rotation of the cable winding drum.

[0010]

According to the present invention, since the cable is retained while being wound around the cable winding drum for at least one turn, the entire cable can bear the tension of tension, and the cable between the cable sheath and the inner core can bear the tension. Misalignment is much less likely to occur compared to winding grips or wedge clamps. In addition, by winding the cable around the cable winding drum for 2 to 3 turns, the tension on the tail side is significantly smaller than the tension on the tail side. Therefore, it is possible to pull the cable by simply gripping the cable on the tail side. it can.

Since the cable winding drum can be rotated with respect to the fixed base, the cable is lightly wound around the cable winding drum, and then the drum is rotated in the direction in which the cable is tightly tightened so that the cable has an appropriate tension (or Slack) and the drum can be locked against rotation in that position. By doing so, the cable clamp of the present invention can simultaneously perform the tightening and the pulling.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is for explaining a first embodiment of the cable clamp of the present invention. FIG. 1 (A) is a front view showing a state in which the cable clamp is attached to a utility pole, and FIG. 1 (B).
Is a side view thereof. In the figure, 1 is a fixing base, 2 is a cable winding drum, 2a is a supporting member, 2b is a fixing hole, 3
Is a shaft, 4 is a cable holder, 5 is a rotation stop pin insertion hole, 6 is a rotation stop pin, 7 is a handle, 8 is a cable,
Reference numeral 9 is a pole pillar fitting, and 10 is a pole pillar band. On the lower surface side (left side in FIG. 1 (B)) of the fixing base 1, a pole fitting 9 is attached, and is fixed by a pole band 10 to a support (not shown), for example, an electric pole. A shaft 3 is provided in the center of the fixed base 1, and a plurality of rotation stop pin insertion holes 5 are formed on the circumference around the shaft 3. The cable winding drum 2 is formed in a columnar shape, and the width of the drum corresponding to the height of the column is such that the cables can be wound in parallel for one turn or more. The upper surface of the drum (right side in FIG. 1B) is provided at a position slightly recessed from the end surface, and the fixing hole 2 is provided at a position corresponding to the rotation stop pin insertion hole 5.
b is open. A support member 2a having cross arms is attached to the upper surface of the cable winding drum 2, and a bearing is provided through the center of the support member 2a. Since this bearing receives the shaft 3 provided on the fixed base 1, the cable winding drum 2 is structured to be rotatable with respect to the fixed base 1. Support member 2a
The three arms are also provided with holes penetrating from the fixing holes 2b on the upper surface, and the handle 7 is slidably attached to the remaining one arm. By sliding the handle 7, the position of the handle (distance from the central axis) can be adjusted. If the tip end of the arm of the support member 2a is projected outward from the outer circumference of the cable winding drum 2, it is possible to prevent the cable 8 from coming off the cable winding drum 2 when winding the cable 8. It should be noted that it is desirable to consider the prevention of slippage by sticking rubber or urethane having a large frictional force to the body of the cable winding drum 2 so as to minimize the slippage of the cable 8 to be clamped. .

A method of using this cable clamp will be described. After the fixing base 1 is fixed to the electric pole to be erected by the mounting pole band 10, the cable 8 is wound around the cable winding drum 2 for 2 to 3 turns. While holding down the rear side of the cable 8, the cable winding drum 2 is rotated by the handle 7 attached to the cable winding drum 2 to tighten the cable 8 to a desired tension. With the tight line completed, the rotation stop pin 6 is inserted at the position where the rotation stop pin insertion hole 5 on the fixed base 1 and the fixed hole 2b of the cable winding drum 2 coincide with each other to rotate the cable winding drum 2. Prevent.

Further, in order to prevent the longitudinal displacement of the cable 8 and the floating of the cable 8 from the cable winding drum 2, the cable pressing metal fitting 4 is provided with a cable inlet (upper right side in FIG. 1 (A)) and an outlet (upper right). Attach it near the lower left side of the figure). The cable holder 4 is a cable 8
With the structure in which the drum of the cable winding drum 2 is sandwiched and tightened, it can be attached to any position on the drum (on the circumference) of the cable winding drum 2.

FIG. 2 shows a second embodiment of the cable clamp of the present invention.
1A is a front view showing a state in which a cable clamp is attached to a telephone pole, FIG.
(B) is a side view thereof. In the figure, the same parts as those in FIG. Reference numeral 11 is a ratchet plate, and 12 is a ratchet claw. In this embodiment, a ratchet plate 11 and a ratchet claw 12 are provided between the fixed base 1 and the cable winding drum 2. The ratchet plate 11 is fixed to the cable winding drum 2 and can freely rotate with respect to the shaft 3 of the fixed base 1. on the other hand,
The ratchet claw 12 is attached to the fixed base 1,
The ratchet plate 11 and the cable winding drum 2 rotate in only one direction. The cable winding drum 2 is rotated by the handle 7 as in the first embodiment described with reference to FIG. When the rotation of the cable winding drum 2 is stopped, the cable winding drum 2 is automatically fixed.

At the end of the tautness, the drum may be further rotated in the direction to taut the cable, but will usually not rotate in the loosening direction due to some tension. When the cable winding drum 2 is also rotated in the opposite direction, ratchet pawls may be provided in both directions and switched.

FIG. 3 is a third view of the cable clamp of the present invention.
FIG. 6 is a front view for explaining the embodiment of FIG. 9 and showing a state in which a cable clamp is attached to a telephone pole. In the figure, the same parts as those in FIG. 13 is a chain, and 14 and 15 are gears. In this example,
A gear 1 is provided between the fixed base 1 and the cable winding drum 2.
4 is provided, and a chain 13 is connected to the gear 15 to which the handle 7 is attached. The gear 14 is fixed to the cable winding drum 2 and can freely rotate with respect to the shaft 3 on the fixed base 1. The center axis of the gear 15 is fixed to the fixed base 1, and the gear 15 can be rotated by the handle 7. The gear 14 is larger than the gear 15, and the rotation of the handle 7 is decelerated so that the cable winding drum 2 is rotated.
Be transmitted to. Due to the reduction ratio of the gears 14 and 15 and the length of the handle 7 (distance of the handle from the central axis), the force for rotating the handle 7 with respect to the tight tension of the cable 8 can be considerably reduced.

The cable winding drum 2 is locked after tightening the wire by fixing a hole in the middle of the handle 7 and the fixing base 1.
Then, the rotation stop pin 6 is inserted in a position where the gear 15 and the rotation stop pin insertion hole 5 provided at an appropriate interval on the concentric circumference are aligned with each other.

The cable winding drum 2 may be fixed between the cable winding drum 2 and the fixing base 1 as in the first embodiment described with reference to FIG.
Further, the transmission of the rotational force between the handle 7 side and the cable winding drum 2 side is not limited to the gear, and a disc may be used and a belt having a large frictional force such as rubber may be used instead of the chain. However, it is advisable to employ a means for preventing the disc from being displaced from the belt when the cable is tightened or when the cable is pulled down thereafter, for example, by providing a groove on the circumferential surface of the disc.

The locking method for preventing the rotation of the cable winding drum is not limited to the above-described embodiment, and for example, the method of tightening the central shaft or
An appropriate method such as a method of fastening a cable winding drum or gear or a part of a handle together with a fixing base can be adopted.

[0021]

As is apparent from the above description, by using the cable clamp of the present invention, when the aerial cable is directly fastened to a utility pole or the like, a displacement between the cable sheath and the inner core and an increase in transmission loss are increased. While preventing
It is possible to draw with sufficient tension. Moreover, a handle for rotating the cable winding drum can be provided, and by adjusting the length, etc., this can be done with a sufficiently small force, so the work of pulling from the tight line on the pillar alone can be done. It is possible to do.

Further, since it can be used for a cable in which a displacement between the sheath and the inner core is relatively likely to occur, it can be applied to a wide range of cable structures including an optical cable.

Furthermore, when the cable clamp according to the present invention is used in a case where the cable is temporarily and temporarily hung directly on the power pole, the cable clamp can be used in a short time, easily and without damaging the cable. It is very effective because it can be hung.

[Brief description of drawings]

FIG. 1 is an explanatory view of a first embodiment of a cable clamp of the present invention.

FIG. 2 is an explanatory view of a second embodiment of the cable clamp of the present invention.

FIG. 3 is an explanatory view of a third embodiment of the cable clamp of the present invention.

FIG. 4 is an explanatory diagram of an example of a conventional cable clamp.

[Explanation of symbols]

 1 fixing base 2 cable winding drum 2a supporting member 2b fixing hole 3 axis 4 cable holding fitting 5 rotation stop pin insertion hole 6 rotation stop pin 7 handle 8 cable 9 mounting post bracket 10 mounting post band 11 ratchet plate 12 ratchet claw 13 chain 14 and 15 gears

Claims (1)

[Claims] 1. A fixing base for fixing to a support, a shaft provided on the fixing base, a cable winding drum rotatably attached to the shaft, and a rotation of the cable winding drum. A cable clamp having a locking means for locking.