JP3177476B2 - Overhead wire fastener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead wire having a cam-along mainly used for laying an electric wire on a power transmission tower and a function of a retaining bracket for fastening an overhead ground wire to the steel tower. Related to fasteners.

[0002]

2. Description of the Related Art The work of laying overhead wires such as electric wires between towers is performed by temporarily laying overhead wires between both towers in a loose state.
Fix the overhead wire to one of the towers, attach the cam-along to the overhead wire on the other tower side, and then pull the towed line, such as the wire connected to the cam-along, to tension the overhead wire to the specified tension. Then, the portion of the overhead wire that extends further than the cam-along is cut, a retaining clamp is inserted into the cut end portion, compressed, and the end portion of the overhead wire is attached to the insulator. After that, the cam-along is removed from the overhead line, and this series of operations is called tightening operation. Also, in the case of an overhead ground wire, a fastening metal and a fastening clamp having the same structure as the above-mentioned cam-along are used, and the cam-along and the fastening hardware are attached to the overhead ground wire, and the overhead It tightens the ground wire and secures the retaining clamp to the tower.

[0003] By the way, a conventional cam-along is of a wedge type, and a main body in the form of a tapered pipe can be vertically divided into two parts. ,
After the main body is opened and put on the electric wire, the main body is closed and tightened with bolts and nuts, then a pair of wedges with a semicircular cross section are tapered from the large diameter side of the main body to firmly grip the electric wire and the like. . Each part of the main body is also provided with ears for hanging traction lines such as wires.

[0004]

When the wedge-type cam armong is mounted on an overhead wire, the two main bodies divided as described above are tightened with bolts and nuts, and the mating surfaces of the two main bodies are pressed against each other. When driving a pair of wedges, it is most important that both wedges are aligned and that they are driven properly. In particular, there is a problem in adjusting the wedge driving,
If the driving amount is too large, the tow of the cam-along is towed when pulling the cam-along, so at the beginning of the towing, the wedges holding the wire bite into the body deeply, resulting in excessive tightening of the wire. And adversely affect the wires. On the other hand, if the wedge driving amount is small,
The wedge bite is small and the gripping force on the electric wire is weak, and sometimes the camalong may slide down and cause a personal injury. There was a problem that we had to rely on. Furthermore, the conventional one is made of steel and is very heavy, so there is a great risk of handling it at high places, and it is necessary to always carry out inspection and management to prevent rust or metal fatigue. .

SUMMARY OF THE INVENTION The present invention has been developed with the object of being able to fasten and attach to an overhead wire with no excess or deficiency without particularly relying on a skilled person, and to facilitate installation work at high places. It was done.

[0006]

A solution according to the present invention comprises a main body which is divided into two parts by a hinge and which is formed into a cylindrical shape by a locking means. A collet including a tapered portion having a diameter gradually reduced toward both end portions and a plurality of slits in the longitudinal direction is slidably fitted along the longitudinal direction of the main body, and the taper on one side of the collet is mounted on the main body. A fixed wedge that protrudes along the portion is provided, and a movable wedge that slides along the tapered portion on the other side is fitted, and a bracket extending from the end of the main body on the side fitted with the movable wedge is provided, At each bracket, a lever which is tilted by towing by a tow line is pivotally supported at an intermediate portion, and the movable wedge is pushed into the main body by the tilting so that the tip of the collet is brought into close contact with the overhead wire. Characterized in that it comprises an arc-shaped cam portion in close contact with the overhead wire also rear end of the collet in a fixed wedge body integral to lead the body the collet as a fixed body.

Further, it is preferable that a split sleeve is detachably attached to the inner surface of the collet.

Another solution is to form a main body which is divided into two parts by a hinge and formed into a cylindrical shape by a locking means. The main body has a cylindrical body which can be divided into two parts. A collet having a tapered portion having a diameter gradually reduced and a plurality of slits in the longitudinal direction is slidably fitted along the longitudinal direction of the main body, and a cylindrical sleeve that can be divided into two is rotatably engaged in the collet. The sleeve has a concave groove on the inner wall surface of the sleeve, into which a spiral fin of a finned wire fits, and a fixed wedge that protrudes from the main body along a tapered portion on one side of the collet. A movable wedge that slides along the tapered portion on the other side is fitted, a bracket extending from the end of the main body on the side fitted with the movable wedge is provided, and each bracket is tilted by being pulled by the tow line. In it By pivoting the lever, the movable wedge is pushed into the main body by tilting, the tip of the collet is brought into close contact with the overhead wire, the collet is pulled as a fixed body, and the main body is pulled, and the fixed wedge is integrated with the main body. The rear end of the collet is also provided with an arc-shaped cam portion which is in close contact with the overhead wire.

[0009]

[Function] To attach the main body to the overhead wire (including the electric wire and the overhead ground wire), open the main body from the hinge, and the inner collet is also divided into two and engaged with both elongated bodies of the main body.
The movable wedge is first pushed into the main body by the cam part of the lever by placing the main body in a tubular shape with the locking means and pulling the tow line attached to the lever. The movable wedge side of the collet comes into close contact with the overhead wire by the action of the taper. If you pull the lever further,
The cam presses the movable wedge and the collet, but the collet is already fixed in close contact with the overhead wire. The wedge side is also in close contact with the overhead wire, and can be securely attached to the overhead wire by this close contact.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment according to the present invention, the main body can be formed by joining a pair of elongated bodies by hinges and opening them in two, and can be formed into a cylindrical shape by overlapping both elongated bodies. Further, it is formed so as to be held in a cylindrical state by the lock means. A fixed wedge protrudes from one end of the main body, and a bracket extending from the main body protrudes from the side of the main body opposite to the side provided with the fixed wedge.

The collet has an overhead wire directly or indirectly clamped therein. The collet is formed by dividing a cylindrical body into two and slidably fitted in each elongated body of the main body. Are provided at both ends of the outer peripheral surface thereof with tapered portions whose diameters gradually decrease from the center in the longitudinal direction to the ends. The above-mentioned indirect holding of the overhead line means that a cylindrical sleeve that can be split into two is detachably provided inside the collet, and is replaced by abrasion or the like to directly adhere to the overhead line. Further, the collet is provided with a plurality of sleeves extending from both ends to an intermediate portion.

When the collet is placed in the main body, a fixed wedge provided on the main body overlaps with one of the tapered portions.
A movable wedge inserted into the main body overlaps the other tapered portion, and a compression spring is interposed between the fixed wedge and the movable wedge.

Further, a lever is pivotally supported at an intermediate portion of a bracket provided on the main body, and the lever is provided with a cam portion.

Further, as another embodiment, a finned electric wire (several ridges are protruded spirally around the outer periphery of the electric wire,
This ridge is also referred to as a fin), and the fastener can be slid along the finned wire when not tightened.

According to the structure, a concave groove for engaging a fin of an electric wire is provided in a spiral strip in a sleeve provided in the collet, and the sleeve is rotatably fitted to the collet. Other configurations are the same as those of the above embodiment.

[0016]

EXAMPLES Next, specific examples will be described.
As shown in FIGS. 1 to 3, the main body 1 is formed of a pair of upper and lower elongated bodies 1 a and 1 b having a U-shaped cross section, and becomes a cylindrical body when overlapped with each other. 1a,
1b, bearing portions 2 and 3 are staggered from each other, a hinge 4 is fitted to one bearing 2, the main body 1 can be opened in two around the hinge 4, and the other bearing 3 can be opened. And a lock means 5 for forming a cylindrical body by inserting a pin into the cylindrical body.

Further, brackets 6, 6, 7, and 7 projecting from both sides of the upper and lower elongated bodies 1a and 1b of the main body 1 are provided so as to extend from the main body 1, respectively.

A collet 10 is fitted into the main body 1 via a fixed wedge 8 and a movable wedge 9. The fixed wedge 8 is shown in FIG.
And each elongated body 1a, 1 of the main body 1 as shown in FIG.
b, which is attached to the main body 1 and fixed to the end of the main body 1 on the side opposite to the brackets 6 and 7 side. In this state, the main body 1 has a taper whose diameter gradually increases from the end toward the center.

As shown in FIGS. 6 to 8, the movable wedge 9 is slidably inserted from the opposite side of the main body 1 from the fixed wedge 8, that is, from the side where the brackets 6 and 7 protrude. In the same manner, it is divided into two and combined to form a cylindrical body, and the inner diameter thereof is tapered so that the diameter gradually increases from the distal end toward the center when inserted into the main body 1, Further, a flange 11 is provided at the end. Compression spring 1 between movable wedge 9 and fixed wedge 8
2 is interposed.

As shown in FIGS. 9 to 11, the collet 10 is similarly halved and overlapped to form a cylindrical body. The diameter of the collet 10 is increased at both ends of the outer peripheral surface from the center to the end. The tapered portions 13 and 14 gradually become thinner. The fixed wedge 8 comes into contact with one tapered portion 13 and the movable wedge 9 comes into contact with the other tapered portion 14. Is provided so as to extend from both ends to an intermediate portion, and a longitudinally long through hole 16 is opened at a central portion, and a support pin 17 erected in the main body 1 is engaged with the through hole 16 to extend in the longitudinal direction. It is slidably fitted. The collet 10 is pressed against the inside of the main body 1 by a pressing spring 18 fitted on the outer periphery of the support pin 17.

On the inner periphery of the collet 10, a sleeve 19, which can be split in half, is removably attached with mounting bolts. The sleeve 19 is shown in FIGS.
As shown in FIG. 2, the flange 20 is provided at both ends, and the flange 20 and the main body of the sleeve 19 have the slit 15 like the collet 10. This sleeve 1
9 directly holds the overhead wire W, the overhead wire W has various forms, particularly in the case of a finned wire in which several fins H are spirally provided on the outer periphery shown in FIG. As shown in FIG. 16, a replacement part in which a concave groove 25 is spirally provided on the inner surface of the sleeve 19 is prepared.

The support shafts 21 are provided in parallel with each other between the brackets 6, 6, 7 and 7 of the main body 1 assembled as described above, and a pair of left and right levers 22 is provided on each support shaft 21. A cam portion 23 is provided at an intermediate portion of the lever 22 so as to be rotatable.
And a support rod 24 extending between the left and right levers 22 is provided at the opposite end, and a tow line Y such as a wire is hung on each of the support rods 24.

The cam portion 23 is formed in a semicircular shape, and a part of the cam portion 23 is in contact with the flange portion 11 of the movable wedge 9 pressed by the spring 12. In this state, the collet 10 or the sleeve The gap between the end face 19 and the cam portion 23 is formed to be wide.

In order to use the fastener having the above structure, the fastener is attached near the end of an overhead wire W temporarily installed on a steel tower. It is mounted in a tubular shape by a locking means 5 for inserting a pin into the bearing portion 3.

Next, both support rods 24 of each lever 22
Already has a tow line Y already attached,
By pulling both the towed lines Y by a machine such as a winch provided on the ground, the lever 22 is tilted and the movable wedge 9 is pushed into the main body 1 by the cam portion 23 thereof.
At this time, the movable wedge 9 and the tapered portion 14 of the collet 10 bring the movable wedge 9 side of the collet 10 into close contact with the overhead wire W.

Further, both towed lines Y are towed, and by this towing, both levers 22 are further tilted and the cam portion 23
Abuts against the movable wedge 9 and the end face of the collet 10 or the sleeve 19 and presses the same.
9 is a part but is in close contact with the overhead wire W, so that the collet 10 or the sleeve 19 becomes a fixed body, and conversely, the main body 1 slides toward the movable wedge 9 side. Due to the action of the fixed wedge 8 and the tapered portion 13 facing the fixed wedge 8, the portion of the collet 10 or the sleeve 19 facing the fixed wedge 8 is also in close contact with the overhead wire W. After such attachment, the overhead wire is attached by the same operation as in the related art.

The fastener attached as described above is connected to the overhead wire W
To remove more, loosen the tow line Y,
Since the movable wedge 9 moves backward by the repulsive force of the spring 12 provided in the main body 1 and at the same time the lever 22 stands up to its original state, the holding force of the collet 10 or the sleeve 19 with respect to the overhead wire W is released. Then, the locking means 5 can be released and the main body 1 can be removed by breaking.

When the fastener is attached to the finned electric wire, the sleeve 19 having the spiral groove 25 may be used as described above, and the sleeve 19 is fixed to the collet 10 by a fixing bolt passing through the flange 20. Because
When the fastener is fastened to the finned electric wire, it slightly rotates along the spiral ridge of the electric wire, and the rotation causes the entire main body 1 to rotate. It does not hinder torsion or tightening,
Unexpected accidents may occur due to the wind, for example, because the work is performed at high altitudes. If the tilting of both levers 22 is slightly disturbed, imbalance may occur in the tightening force from both sides. .

Most preferably, the sleeve 19 is independently rotatably mounted so that the above imbalance does not occur.

This embodiment will be described only with respect to portions different from the embodiment shown in FIG. 1, but as shown in FIGS. 16 and 17, between the flanges 20 provided at both ends of the sleeve 19 having the groove 25. The collet 10 is rotatably engaged, an annular groove 26 having a V-shaped cross section is provided on a surface of the sleeve 19 facing the flange 20, and a ball 27 is pressed on the end surface of the flange 20 into the V-shaped annular groove 26 by a spring. A plurality of ball plungers 28 are provided. A V-shaped annular groove 26 is provided on the collet 10 side, and a ball plunger 28 is provided.
May be provided on the flange 20 of the sleeve 19.

In the above description, the sleeve 19 has been described as being in a cylindrical state. However, the sleeve 19 can be divided into two parts, and the upper and lower members forming the sleeve 19 do not abut on their side edges, but are imaginary. It is formed so that a gap is formed between the upper and lower members because it is tightened to the wire, and when the sleeve 19 rotates, the one member faces the side edge of the other member so that the gap is securely maintained. In addition, a plurality of interval holders 30 that press the push rod 29 with a spring are interposed.

Therefore, when the fastener provided with the rotatable sleeve 19 is attached to the fin overhead wire W and the fastener is pressed to one side along the overhead wire W before the tow line Y is drawn, The sleeve 19 is connected to the overhead wire W independently of the main body 1.
Is rotated by the spiral fin H. Further, when the tow line Y hung on the support rod 24 is pulled, the sleeve 19 is slightly rotated, but the main body 1 is not rotated, so that the overhead line W can be securely tightened. . When the fastener of this example is fastened to the overhead wire W, the sleeve 19 is not rotated. However, after that, since the main body 1 can be rotated in reverse, if the overhead wire W is fastened to the connecting portion of the overhead wire W with the insulator via the main body 1, the twist of the overhead wire can be prevented. Can be.

[0033]

According to the overhead wire fastener according to the present invention,
By tilting the lever after attaching the main body to the overhead wire, the movable wedge is inserted into the main body, one end of the collet adheres to the overhead wire, and the lever is further tilted deeply,
The other end of the collet is attached to the overhead wire with a fixed wedge,
Moreover, since the lever is provided with an arc-shaped cam portion, and the movable wedge and the fixed wedge are slid by the cam portion, the main body can be uniformly fastened to the overhead wire without being tightened more than necessary. You can do it.

Further, since the collet is provided with a plurality of slits, the diameter of the collet is reduced by tightening.
The inner peripheral surface can be in close contact with the overhead wire over the entire surface, and can be extremely firmly attached.

If a sleeve corresponding to the finned electric wire is provided and the sleeve rotates with respect to the collet, only the sleeve rotates by the fin of the electric wire and the main body does not rotate. It is possible to uniformly tighten each of the fixed wedge and the movable wedge without entanglement of the tow line hung on the wedge.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of an overhead wire fastener according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of a fixed wedge.

FIG. 5 is a sectional view of the same.

FIG. 6 is a plan view of a movable wedge.

FIG. 7 is a side view of the same.

FIG. 8 is a sectional view of only one side thereof.

FIG. 9 is a plan view of a collet.

FIG. 10 is a longitudinal sectional view of the same.

FIG. 11 is a transverse sectional view of the same.

FIG. 12 is a plan view of a sleeve.

FIG. 13 is a sectional view of the same.

FIG. 14 is a side view of the same.

FIG. 15 is a perspective view of a finned electric wire.

FIG. 16 is a sectional view showing a sleeve for directly gripping the electric wire shown in FIG. 15;

FIG. 17 is a cross-sectional view illustrating a main part of a fastener in which a sleeve is rotatably provided.

[Explanation of symbols]

 Reference Signs List 1 main body 1a, 1b elongated body 4 hinge 5 locking means 6, 7 bracket 8 fixed wedge 9 movable wedge 10 collet 13, 14, tapered portion 15 slit 19 sleeve 21 support shaft 22 lever 23 cam portion 24 support rod 25 concave groove

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02G 1/04 H02G 1/02 H02G 7/02

Claims (3)

(57) [Claims] 1. A main body (1) divided into two parts by a hinge (4) and formed into a cylindrical shape by a locking means (5). A collet (10) having a tapered portion (13, 14) whose diameter is gradually reduced toward each end and a plurality of slits (15) in the longitudinal direction is slid along the longitudinal direction of the main body (1). A fixed wedge (8) that fits freely and comes into contact with the main body (1) along the tapered portion (13) on one side of the collet (10) protrudes, and the tapered portion (14) on the other side protrudes. A movable wedge (9) that slides along the main body (1) is provided, and brackets (6, 7) extending from the end of the main body (1) on which the movable wedge (9) is fitted are provided. ), The lever (22) tilted by towing by the tow line (Y) is placed in the middle. By pivoting the lever (22), the movable wedge (9) is pushed into the body by tilting, and the tip of the collet (10) is brought into close contact with the overhead wire (W). Is provided with an arc-shaped cam portion (23) that pulls the main body (1) as a fixed body, and the rear end of the collet (10) is also in close contact with the overhead wire with a fixed wedge (8) integral with the main body. Characteristic fastener for overhead wire. 2. The overhead wire fastener according to claim 1, wherein a split sleeve (19) is detachably attached to an inner surface of the collet (10). 3. A main body (1) divided into two parts by a hinge (4) and formed into a cylindrical shape by a locking means (5). Tapered portions (13, 14) whose diameters gradually decrease toward both ends, and a plurality of slits (15) in the longitudinal direction.
A collet (10) having the following is slidably fitted along the longitudinal direction of the main body (1), and a halved cylindrical sleeve (19) is rotatably engaged in the collet (10). And a concave groove (25) in which a spiral fin of a finned electric wire is fitted on an inner wall surface of the sleeve (19),
A fixed wedge (8) abutting along the tapered portion (13) on one side of the collet (10) protrudes from the main body (1), and a movable wedge sliding along the tapered portion (14) on the other side. (9) is fitted, and brackets (6, 7) extending from the end of the main body (1) on which the movable wedge (9) is fitted are provided, and each bracket (6, 7) has a tow line ( Pivoting the lever (22), which is tilted by the traction according to Y), in its middle,
The lever (22) has a movable wedge (9)
Of the collet (10) into close contact with the overhead wire (W), pulling the main body (1) with the collet (10) as a fixed body, and using a fixed wedge (8) integral with the main body. (10) An overhead wire fastener comprising an arc-shaped cam portion (23) that also closely contacts the overhead end to the overhead wire.