JPS629007Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a live wire tensioning device used for tensioning electric wires while current is flowing.

An object of the present invention is to provide a live wire tensioning device that has excellent electrical insulation and can use a large tension.

In order to achieve the above object, the present invention has a wire tensioner main body 1 and a movable pulley 2, as illustrated in the illustrated embodiment.
are connected by an electrically insulating belt 3, and the movable pulley 2 is pulled toward the wire tensioner main body by winding the belt of the wire tensioner main body 1.
At least one of the connection between the wire tensioner main body 1 and the first connection fitting 4 and the connection between the movable pulley 2 and the second connection fitting 5 is connected to the head 7 and the shaft portion 8 by an electrically insulating cylinder 6.
It is characterized in that it is carried out using a bolt-shaped connecting fitting 9 that is partially covered.

The present invention will be explained in detail below based on embodiments shown in the drawings. 1 is a wire tensioner main body, a pair of side plates 10,
The main shaft 11 is rotatably supported between 10 and
Flanges 13 are provided on both sides of the hexagonal section 12 of the main shaft 11.
A winding barrel 14 made of light alloy having a diameter of 13 is fitted onto the main shaft 11, and a handle 17 is attached to the end of the main shaft 11 to transmit rotation through a brake gear 15 and a ratchet mechanism 16 that come into frictional contact with the main shaft 11. .
The ratchet mechanism 16 consists of a ratchet wheel 18 that rotates integrally with the main shaft 11, and a switching pawl 19 pivotally supported on the handle 17. When the switching pawl 19 is set to the winding state, the rotation of the handle 17 in the winding direction is as follows. This is transmitted to the winding drum 14 via the ratchet mechanism 16 and the main shaft 11, and the rotation of the handle 17 in the opposite direction, that is, in the unwinding direction, becomes free rotation and is not transmitted to the main shaft 11. The brake gear 15 is prevented from rotating in the feeding direction by a stopper 20 pivotally supported on the side plate 10. This brake gear 15
are spring washers and brake plates (not shown)
Braking force is applied to the main shaft 11 by these actions. When the handle 17 is rotated in the winding direction,
The brake gear 15 also rotates together with the main shaft 11,
When a force is applied to the main shaft 11 to rotate it in the feeding direction, the brake gear 15 and the stop pawl 20
In order to stop this, the braking force is applied to the main shaft 11.
It acts on The handle 17 has a torn insulating case 21 made of electrically insulating synthetic resin, for example FRP. Further, a belt fixing pin 22 and a connecting pin 23 are pivotally supported between the side plates 10, 10, and a U-shaped frame 24 is attached via the connecting pin 23. Sho 25
is a belt regulating member.

The cylindrical portion 26 of the winding drum 14 has an outer periphery with a circular cross section and an inner periphery with a hexagonal cross section, and is configured to rotate integrally with the main shaft 11. One end portion 27 of the electrically insulating synthetic resin belt 3, such as a nylon belt or a polyester belt, is fixed to the outer periphery of the cylindrical portion 26.

The other end portion 28 of the belt 3 is fixed to the belt fixing pin 22. This belt 3 is wound around the movable pulley 2, and by winding the belt 3 around the winding drum 14 by operating the handle 17, the movable pulley 2 can be drawn toward the wire tensioner main body 1. It consists of

The movable pulley 2 includes a U-shaped frame 29 and a pulley body 30 rotatably supported by the frame 29. This pulley main body 30 can be made of metal, and can also be made of synthetic resin (for example, nylon) having electrical insulation properties.

The first connecting fitting 4 is connected to the U-shaped frame 24 of the wire tensioner main body 1 by a bolt-shaped connecting fitting 9 whose head 7 and part of the shaft portion 8 are covered by an electrically insulating cylinder 6. ing. In this embodiment, the first connection fitting 4 is composed of a U-shaped frame 31 and a connecting shaft bolt 32, but it can also be configured such that a hook is pivotally supported on the U-shaped frame 31. In addition, as shown in FIG. 3, for example, this first connecting fitting 4 suspends an end ring portion 34 of a nylon rope 33, and connects the nylon rope 33 to a support such as a utility pole via a tail metal (not shown) or the like. connected to. The electrical insulation tube 6 is made of ABS
It is made of insulating plastic such as resin, and consists of a head cylinder part 35 with a large diameter and a shaft cylinder part 36 with a small diameter. This electric insulating tube 6 has a bolt-like connecting fitting 9.
is inserted, and the tip of the shaft portion 8 of the connecting fitting 9 protrudes from the tip of the shaft cylinder portion 36. Further, the head 7 of the connecting fitting 9 is housed within the shaft cylindrical portion 36, and a washer 37 is interposed between the head 7 and the bottom surface of the shaft cylindrical portion 35. After the connecting fitting 9 is inserted into the electrically insulating tube 6, an insulating plastic cap 38 is fitted into the opening of the shaft tube portion 36 (it may also be screwed on).

The U-shaped frame 24 of the wire tensioner body 1 is provided with a hole 39 through which the shaft cylindrical portion 36 of the electrically insulating tube 6 is inserted, while the U-shaped frame 31 of the first connection fitting 4 is provided with a hole 39 for inserting the shaft portion 36 of the electrically insulating tube 6 . A screw hole 41 is provided to be screwed into a thread 40 formed on the tip side portion. In this way, the shaft cylindrical portion 36 of the electrically insulating cylinder 6 with the bolt-like connecting fitting 9 installed therein is
As shown in FIG. 2, after inserting into the hole 39, the thread 40 of the connecting fitting 9 is screwed into the screw hole 41, and the tip 42 of the shaft portion protruding inward from the screw hole 41 is tapped. By deforming it to an enlarged diameter state, the wire tensioner main body 1 is connected via the bolt-like connecting fitting 9.
The first connecting fitting 4 is connected to the first connecting fitting 4. Further, the wire tensioner main body 1 and the first connecting fitting 4 are electrically insulated by the electrically insulating tube 6.

A second connecting fitting 5 is connected to the U-shaped frame 29 of the movable pulley 2 by a bolt-shaped connecting fitting 9 whose head 7 and part of the shaft portion 8 are covered by an electrically insulating cylinder 6. . The second connection fitting 5 has the same structure as the first connection fitting 4, as shown in FIG. Further, as shown in FIG. 3, for example, this second connection fitting 5 has a wire gripper 43 attached to the connecting shaft bolt 32, and a live wire held by the wire gripper 44 via the wire gripper 43. 45. The connection structure between the U-shaped frame 29 and the second connection fitting 5 is the same as the connection structure between the U-shaped frame 24 of the wire tensioner main body 1 and the first connection fitting 4, so the explanation will be omitted (not shown in the drawing). Common parts of both connected structures are given common symbols.)

When the device of the present invention is arranged and used as shown in FIG.
By winding up the belt 3, the movable pulley 2 is pulled toward the wire tensioner main body, and the live wire 45 held by the wire gripper 43 is pulled in the same direction to carry out wire tensioning work. be able to.

The present invention can be configured in various ways other than those shown in the above embodiments. For example, in the embodiment described above, the tip 42 of the shaft portion 8 of the bolt-like joint fitting 9 is deformed to an enlarged diameter state, and the connecting fitting 9 and the first connecting fitting 4 are
(or the second connecting fitting 5), but instead of this, a lock nut may be screwed into the thread 40 of the shaft portion 8 to strengthen the connection. Further, the bolt-like connecting fitting 9 according to the present invention may have a shape similar to a bolt, as long as it has a head 7 and a shaft portion 8, and may have a thread 40 carved therein as in the above embodiment. Including outer screw thread 40
In the latter case, a retaining ring may be welded to the tip of the shaft portion 8 to prevent it from coming off, or a retaining pin may be fixed to the end of the shaft portion 8 to prevent it from coming off, and it can be used as a connector. . Furthermore, in the embodiment described above, the head 7 of the bolt-like connecting fitting 9 and the head tube portion 35 of the electrically insulating tube 6 are respectively arranged on the side of the U-shaped frame 24 (or the U-shaped frame 29). It is also possible to arrange it on the side of the first connection fitting 4 (or the second connection fitting 5). Further, in the above embodiment, the wire tensioner main body 1
and the first connecting fitting 4 and the movable pulley 2 and the second connecting fitting 5 are connected by a bolt-shaped connecting fitting whose head 7 and part of the shaft portion 8 are covered by electrically insulating tubes 6, 6. 9, 9, but only one of them may be connected using the electrically insulating cylinder 6, and even in that case it is effective in ensuring work safety.

As a result of the present invention having the above configuration, the following effects can be achieved.

At least two electrically insulating parts are provided between the first connecting fitting located at one end of the device of the present invention and the second connecting fitting located at the other end.
In other words, the belt placed between the movable pulley and the wire tensioner body has an electrically insulated structure, and
At least one of the connecting portion between the wire tensioner body and the first connecting fitting and the connecting portion between the movable pulley and the second connecting fitting has an electrically insulating structure (a part of the head and shaft portion is covered by an electrically insulating cylinder). bolt-like connecting fittings)
It is becoming.

Therefore, when using the device of the present invention, the first connecting fitting is connected to a support such as a utility pole via a rope or the like, while the second connecting fitting is connected to a live wire via a wire gripper or the like. Electrical insulation parts present at at least two locations can reliably prevent current leaking from a live wire from flowing to a support such as a telephone pole, thereby improving safety.

As mentioned above, at least one of the connecting portion between the wire tensioner body and the first connecting fitting and the connecting portion between the movable pulley and the second connecting fitting has an electrically insulating structure, but the strength of this insulating portion is decline,
This can be prevented by using a bolt-shaped connecting fitting whose head and part of the shaft are covered by an electrically insulating tube. Therefore, according to the present invention, it is possible to provide a live wire tensioning device that not only has excellent insulation properties but also can withstand large tensions.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIG. 3 is a schematic view showing the state of use. DESCRIPTION OF SYMBOLS 1... Main body of wire tensioner, 2... Moving pulley, 3... Belt, 4... First connection fitting, 5... Second connection fitting, 6... Electrical insulation tube, 7... Head, 8... ...Shaft part, 9...Bolt-shaped connecting fitting.

Claims (1)

[Scope of utility model registration request] The wire tensioner main body and the movable pulley are connected by an electrically insulating belt, and the movable pulley can be pulled toward the wire tensioner main body by winding the belt of the wire tensioner main body. At least one of the connection between the main body and the first connection fitting and the connection between the movable pulley and the second connection fitting is made using a bolt-like connection fitting whose head and part of the shaft are covered by an electrically insulating tube. A live wire tensioning device characterized by the following: