JPH0549129A - Constant tension retainer - Google Patents

Abstract

PURPOSE:To retain the tension of a rope to be constant by interlocking a first rotary shaft, where a plurality of rotary discs equipped with constant tension springs and braking mechanisms are attached, and the second rotary shaft of a drum, where a winding-up and down rope is wound, by a linear substance. CONSTITUTION:A first rotary shaft 5 is provided with a plurality of rotary discs 8 freely of rotation. The veering end of a constant tension spring 10, which is provided freely of winding and veering for a pair of salient shafts 9 projecting on one side of the rotary shaft 8, is fixed to the rotary shaft 5. The rotary disc 8 is provided with a controller 11 free of stoppage. On the other hand, a drum 2 for winding and veering a winding up and down rope 13 is fixed to a second rotary shaft 3. A roller chain 7 is laid across the gears 4 and 6 fixed to the rotary shafts 3 and 5. Though the rotary shafts 3 and 5 interlock with each other according to the winding and the veering of the rope 13, the rotation stops at the place where it valances with the preset tension of the constant tension spring 10. The number of rotary discs 8 is increased or decreased according to required tension. Hereby, the rope 13 is retained with constant tension.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for holding the tension of a filamentous body such as a wire holding, unloading, a rope such as a life rope, etc. during a re-working of an electric wire or the like.

[0002]

2. Description of the Related Art In the work of reattaching an electric wire or the like for each radius, when grasping the end of the electric wire to be reattached, if the tension changes and the degree of slack increases, the electric wire, etc. below the live wire is approached. ,It is a danger. Therefore, it is necessary to work while keeping the tension of such an electric wire constant.

Therefore, it is necessary to constantly apply a constant tension to the electric wire by using electricity or a hydraulic motor.

[0004]

However, in order to apply tension to the ends of electric wires using a motor or the like, the apparatus becomes large in size and requires a large space. Moreover, it is difficult for a motor to quickly respond to changes in the load on these wires.

Therefore, the present invention provides a constant tension holding device which has an extremely simple structure and which always has a constant responsiveness, occupying a small space and always holding a constant tension irrespective of the stretching condition of the filament to which the tension is applied. It is intended for.

[0006]

SUMMARY OF THE INVENTION The present invention uses a constant tension spring that follows such a change in tension at high speed, and the constant tension spring is provided so as to be able to be extended and wound up, and a rope or the like is provided at the extension end. The ends of the appropriate filaments are locked.

The specific construction is that a rotatable shaft is provided, a rotary plate is rotatably supported at a plurality of locations on the outer circumference of the shaft, and the rotary plate can be wound around and wound around a protruding shaft on one side of each rotary plate. The fixed end of the constant tension spring provided on the shaft is fixed to the shaft, a braking device that can stop each rotating plate is provided, and the end of an appropriate linear member such as a rope is locked around the outer periphery of the shaft and wound. It was done like this.

[0008]

In the constant tension spring, the load or the like does not change even if the spring is extended and elongated or shortened.

FIG. 3 is a graph showing the relationship between the elongation of the constant tension spring and the load. As can be seen from this graph, this constant tension spring has characteristics completely different from those of the mainspring and the wire-wound spring, and the load and torque are constant no matter how the elongation or rotation angle changes.

Further, according to the present invention, the plurality of rotary plates are stopped by the braking device in accordance with the tension required for the filament.

That is, when each rotating plate on the outer periphery of the shaft is stopped by the braking device, the constant tension spring wound around the shaft acts by the force to wrap the spring, and the shaft is rotated, so that the filaments wound around the shaft are rotated. I try to get more involved in my body. However, tension is applied to the filamentous body and it is held by a constant tension spring. Then, when the linear body is unwound from the shaft, the constant tension spring is also unwound, but the tension is constant.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a schematic configuration of a constant tension holding device 1 of the present invention, in which a shaft 3 of a drum 2 for winding and unwinding a rope is rotatably supported and a gear is mounted on the shaft 3. 4 is fixed so that the gear 4 rotates integrally with the drum 2. Shaft 5 parallel to this shaft 3
Rotatably rotatably supporting the shaft 5 at the same position as the gear 4
A gear 6 is fixed to the gear 6, and the gear 4 and the gear 6 are connected by a roller chain 7. Also, the gear 6 is 1 with respect to the gear 4.
The number of teeth is / 3. Rotating plates 8 are rotatably mounted at four positions on the outer periphery of the shaft 5, respectively, and two projecting shafts 9 are provided on one side of each rotating plate 8 in point symmetry with the shaft 5 as the center. The constant tension spring 10 is extended to
It is wound so that it can be wound freely, and its protruding end is fixed to the shaft 5. Each of these constant tension springs 10 is always urged to be wound around the protruding shaft 9. Further, a pair of brakes 11 that can hold the outer peripheral edge of each rotary plate 8 is provided for each rotary plate 8.

Then, each brake 11 is applied, and each rotary plate 8
The hoisting and lowering rope 13 having a hook 12 at the tip, which is wound around the drum 2 in a state in which the rotation of the
However, when pulled in the feeding direction, the drum 2 rotates,
Shaft 5 through gear 4, roller chain 7, gear 6
However, the constant tension spring 10 is locked to the shaft 5, and the shaft 5 rotates while pulling out the spring 10 against the force of the constant tension spring 10, and the constant tension spring 10 is rotated. The spring 10 stops at a position balanced with a predetermined tension.

When the hoisting and lowering rope 13 wound around the drum 2 is loosened, the shaft 5 is rotated by the force of each of the constant tension springs 10, the shaft 3 is rotated through the roller chain 7 and the gear 4, and the rope is Drums 13
Roll it up.

In this way, the constant tension springs 10 are unrolled or wound up, but a constant tension is maintained regardless of the extended length of these springs.

In the above embodiment, the ratio of the gear 4 of the shaft 3 to the gear 6 of the shaft 5 of the sag control device 1 is set to 3: 1 and the torque applied to the shaft 5 is reduced to 1/3, but the invention is not limited to this. Not something. Further, since the constant tension springs 10 are provided on the four rotary plates 8, the torque can be changed in four steps by applying the brakes 11.
Therefore, the number of rotating plates 8 on which the brake 11 is applied may be increased or decreased depending on the required tension.

Next, FIGS. 4 and 5 show the above constant tension holding device 1.
FIG. 3A is a side view and a cross-sectional view of a main part showing a specific example used in the ground wire replacement method. The shafts 3 and 5 are rotatably supported by both side frames 15 and 15, and spring winding drums 16 are respectively capped on the shaft 5 beside each rotary plate 8 rotatably supported by the shaft 5. It is fixed, and the tip of the constant tension spring 10 is fixed to the outer circumference of each of these spring winding drums 16. In addition, each of the above brakes 1
1 is fixed to each of the two crosspieces 17 provided between the both side frames 15 and 15. Each of these crosspieces 17 is provided along the circumference of the rotary plate 8 so as to be offset from each other, and two pieces each are provided. The brakes 11, 11 are fixed. In each of these brakes 11, two holding pieces 18, 18 are pivotally supported by a shaft 19, and when the handle 20 is turned, the outer peripheral edge of each rotating body 8 is held between the tips of the two holding pieces 18.

A manual winding / unwinding mechanism 21 is provided at one end of the shaft 3. This manual winding / unwinding mechanism 21
Is provided with a flange 22 at one end of the shaft 3, and a rotatable ratchet pawl wheel 23 is provided on the shaft 3 outside the flange 22.
Further, a nut 24 is screwed onto the outer shaft 3 of the ratchet pawl wheel 23, and a ratchet pawl (not shown) is engaged with the ratchet gear 23.

Now, when a handle (not shown) is fitted around the nut 24 and the nut 24 is rotated, the nut 24
Is tightened and the ratchet ratchet wheel 23 is held by the collar 22 and the nut 24, and the ratchet ratchet wheel 23, the collar 22 and the nut 24 rotate integrally. At that time, the rotation of the ratchet pawl wheel 23 is not blocked by the ratchet pawl. Therefore, when the nut 24 is turned in this direction, the drum 2 is rotated and the hoisting rope 13 is hoisted around the drum 2.

When the rotation of the nut 24 is stopped,
The shaft 3 tries to rotate in the reverse direction by the tension of the hoisting and lowering rope 13, but the ratchet pawl wheel 23 integrated with the nut 24 is prevented from rotating by the ratchet pawl, and the shaft 3 and the drum 2 do not rotate.

On the other hand, when the nut 24 is rotated in the opposite direction,
The nut 24 separates from the ratchet ratchet wheel 23 and does not rotate because the ratchet ratchet wheel 23 is locked by the ratchet ratchet, but the nut 24 and the shaft 3 rotate in opposite directions, and the hoisting and lowering rope 13 is unwound from the drum 2. You can

When operating the manual winding / unwinding mechanism 21, it goes without saying that the brakes 11 are released and the rotary plates 8 are free to rotate.

Further, at one end of the both side frames 15,
The first mounting hook 25 provided between the both side frames 15 is provided, one end of each belt 26 is locked to each side plate 15 position below the first mounting hook 25, and the other end of each belt 26 is secured. A second attachment hook 27 is provided, and each belt 26 is provided with a length adjuster 28 for each belt 26.

Therefore, in each of the constant tension holding devices 1 described above, the first attachment hook 25 is hooked on one side of the handrail of the aerial work bucket, which will be described later, and the belts 26 are provided from below the aerial work bucket on the opposite side of the handrail. , And hook the second attachment hook 27 on the handrail to operate each length adjuster 28 to operate each belt 26.
It is fixed to the bucket for work in high places by tightening.

Next, an example in which the constant tension holding device 1 of the present invention is used in an overhead ground wire replacement method will be described with reference to FIGS. 6 and 7.

First, as shown in FIG. 6, an aerial work vehicle 31 is installed near each of two adjacent utility poles 30, and a high place near a armor 33 through which a high voltage overhead distribution line 32 of each utility pole 30 is drawn. The aerial work buckets 34 of the respective aerial work vehicles 31 are arranged in. The constant tension holding device 1 is installed in each of these aerial work buckets 34. Then, from each of these aerial work buckets 34, a worker attaches winding grips 36 to both ends of the old ground wire 35 between the two electric poles 30, respectively.
The hooks 12 of the hoisting and lowering ropes 13 wound around the drums 2 of the constant tension holding devices 1 of the buckets 34 for working at high places are hooked on the winding grips 36. In this state, both ends of the old ground wire 35 are cut. As a result, both ends of the old ground wire 35 are supported by the drum 2 of each constant tension holding device 1.

Then, as shown in FIG. 7, the two aerial work buckets 34 at both ends are respectively moved to move the old ground wire 35 above the high voltage overhead distribution line 32, and outside of these high voltage overhead distribution lines 32. Move to.

At this time, the two buckets 34 for working in high places move freely, so that the hoisting rope 13 is wound up from the drum 2.
Although it is fed out or rolled up, it becomes a form supported by the constant tension spring 10 as described above,
The old ground wire 35 moves while maintaining constant tension and slackness. Therefore, the old ground wire 35 is the live high-voltage overhead distribution line 32.
Always move a certain distance away from.

Then, the old ground wire 35, which has been moved to a side away from the high-voltage overhead distribution line 32 by a certain width or more, is lowered to the ground at the location. To this end, the brakes 11 of the constant tension holding device 1 are released, the rotary plates 8 are set in a rotation-free state, the drums 2 are rotated, and the hoisting and lowering ropes 13 are paid out.
As a result, the hoisting and lowering ropes 13 extend and the old ground wires 35 locked to the respective tips of the ropes descend to the ground.

Therefore, the hooks 12 of the hoisting and lowering ropes 13 are removed from the winding grips 36 on both ends of the old ground wire 35, and the hooks 12 are hooked on the winding grips 38 attached to both ends of a new ground wire 37, which are separately prepared, and then the hooks 12 are fixed again. Each drum 2 of the tension holding device 1 is rotated to wind each hoisting and lowering rope 13. As a result, each hoisting and lowering rope 13 is hoisted around the drum 2 and the new ground wire 3
7 is pulled up to the side of the high voltage overhead distribution line 32.

While the new ground wire 37 is tightly connected, each brake 11 of each constant tension holding device 1 is applied to fix each rotary plate 8 so that it cannot rotate. As a result, the new ground wire 37 is supported by each constant tension spring 10,
It is held by a constant tension. In this state, each aerial work bucket 34 is moved to pass a new ground wire 37 above the high-voltage overhead distribution line 32 over a portion having a certain width or more and bring both ends to the top portion of each utility pole 30. Then, lock and fix both ends of the new ground wire 37 to the top of each utility pole 30,
The hooks 12 of the hoisting and lowering ropes 13 are removed from the winding grips 38 at both ends of the new ground wire 37, and the winding grips 38 are also removed from the new ground wire 37.

In this way, these operations are repeated for each two adjacent utility poles 30 to replace the old ground wire 35 with the new ground wire 37.
It will be replaced with.

In the embodiment, the ratio of the gear 4 of the shaft 3 to the gear 6 of the shaft 5 of the constant tension holding device 1 is set to 3: 1 and the torque applied to the shaft 5 is reduced to 1/3, but the invention is not limited to this. Not something. Further, since the constant tension springs 10 are provided on the four rotary plates 8, the torque can be changed in four steps by applying the brakes 11. Therefore, the number of rotating plates 8 on which the brake 11 is applied may be increased or decreased depending on the required tension.

Further, in the above embodiment, the present invention is used for the ground wire relining method, but the present invention is not limited to this, and the constant tension holding device of the present invention is provided at one end of the lifeline of an aerial worker, and the impact when dropped is obtained. Can be relaxed. Also, in the unloading device, by providing the constant tension holding device of the present invention and always maintaining a constant tension, the hanging load can be held with a small force. For example, when unloading on a pillar, a pulley is attached to the upper part of the pillar and unloading with a rope. If a constant tension holding device of 10 kgF is provided on this pulley, a 20 kg load will be halved at 10 k
Go up with the power of g. As described above, the constant tension holding device of the present invention can be used to keep the tension of various filaments constant.

[0036]

EFFECT OF THE INVENTION The present invention has the above-described structure, and even if the length of a filament such as a rope or an electric wire that requires tension is paid out or wound up from a drum or the like, the length of the filament may change. The constant tension spring absorbs this quickly and can keep the tension of the filament body constant.

Further, in the present invention, since the constant tension springs are dispersedly provided on the plurality of rotary plates rotatably provided on the shaft, an arbitrary number of rotary plates among the plurality of rotary plates can be provided according to the required tension. Since the rotation can be stopped and the torque can be adjusted, if one constant tension holding device is prepared, it can be used in various cases.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a constant tension holding device of the present invention.

FIG. 2 is a partial schematic side view of the constant tension holding device of the present invention.

FIG. 3 is a graph showing the characteristics of a constant tension spring of the constant tension holding device of the present invention.

FIG. 4 is a side view of the constant tension holding device of the present invention.

FIG. 5 is a cross-sectional plan view of essential parts of the constant tension holding device of the present invention.

FIG. 6 is a schematic perspective view showing a state before the old ground wire is cut in the overhead ground wire remounting method using the present invention.

FIG. 7 is a schematic perspective view showing a state after cutting an old ground wire in an overhead ground wire re-construction method using the present invention.

[Explanation of symbols]

 1 Constant tension holding device 5 Shaft 8 Rotating plate 9 Projection shaft 10 Constant tension spring 11 Brake

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayasu Imai 3-27-12 Horikiri, Katsushika-ku, Tokyo Stock company Yasuda Manufacturing Co., Ltd. (72) Inventor Shinichi Yamashita 3-27-12 Horikiri, Katsushika-ku, Tokyo Stocks Company Yasuda Works (72) Inventor Hitoshi Inoue 4-62 Shimotakino, Takino-cho, Kato-gun, Hyogo Prefecture Fujii Electric Works Co., Ltd.

Claims (1)

[Claims] 1. A rotatable plate is rotatably supported at a plurality of locations on the outer periphery of a rotatable shaft, and a feeding end of a constant tension spring provided so as to be able to be wound around the protruding shaft on one side of each of the rotating plates. A constant tension holding device characterized by being provided with a braking device which is fixed to the shaft and is capable of stopping each rotary plate, and an end of an appropriate linear body is locked and wound around the shaft.