JPS6141372Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a wire tensioner for live wire work, which is used to stretch electric wires while current is flowing.

Conventional wire tensioners for live wire work use an electrically insulated structure for the handle of the wire tensioner body and the connecting rope that connects the wire gripper to the movable pulley to ensure work safety, but the present invention improves safety. In order to further improve the performance, instead of the metal winding wire between the wire tensioner main body and the movable pulley, an electrically insulating belt is placed between the two.

The present invention will be explained in detail below based on embodiments shown in the drawings. 1 is the wire tensioner body, a pair of side plates 2, 2
In between, the main shaft 3 is rotatably supported, and a light alloy winding cylinder 6 having flanges 5, 5 on both sides is fitted and attached to the hexagonal section 4 of the main shaft 3. A handle 9 is attached to the end portion to transmit rotation through a brake gear 7 and a ratchet mechanism 8 that come into frictional contact with the end portion. The ratchet mechanism 8 consists of a ratchet wheel 10 that rotates integrally with the main shaft 3, and a switching pawl 11 that is pivotally supported on the handle 9. When the switching pawl 11 is set to the winding state, the rotation of the handle 9 in the winding direction is controlled by the ratchet. Mechanism 8 and main shaft 3
The rotation of the handle 9 in the opposite direction, that is, the unwinding direction, becomes free rotation and is not transmitted to the main shaft 3. The brake gear 7 is prevented from rotating in the feeding direction by a pawl 12 pivotally supported on the side plate 2. This brake gear 7 applies braking force to the main shaft 3 through the action of a spring washer, a brake plate (not shown), and the like. When the handle 9 is rotated in the winding direction, the brake gear 7 is also rotated together with the main shaft 3, but when a force is applied to the main shaft 3 to rotate it in the unwinding direction,
The braking force is applied to the main shaft 3 by the brake gear 7 and the pawl 12 to stop this. The handle 9 is covered with an insulating case 13 made of electrically insulating synthetic resin, for example FRP. Also, both side plates 2, 2
A belt fixing pin 14 and a connecting pin 15 are pivotally supported between them, and a pair of U-shaped frames 1 are connected via the connecting pin 15.
A connecting fitting 16 formed by combining 6a and 16b is attached.

The cylindrical portion 17 of the winding drum 6 has an outer periphery with a circular cross section;
The inner periphery is formed into a hexagonal cross section and is configured to rotate integrally with the main shaft 3. An end portion 19 of a synthetic resin belt 18 having electrical insulation properties, such as a nylon belt or a polyester belt, is fixed to the outer periphery of the cylindrical portion 17. In the illustrated embodiment, the end portion 19 of the belt 18 is folded back to form a two-layer structure, and except for the folded bent portion 30, the folded portion 2
0 and the non-folded portion 21 are sewn over the entire surface, and the latching pin 22 is held within the bent portion 30.

An end portion 19 of the two-layer structure of the belt 18 is fixed to the winding drum 6 by a presser plate 23 in contact with the outer surface of the belt 18 and a pair of bolts 24, 24 passing through the end portion 19. The presser plate 23 has a curved surface along the outer periphery of the cylindrical portion 17, has tapered holes 25, 25 for inserting the bolts 24, 24, and is made of a material that is resistant to shearing, such as metal. It is what was done. Further, the end portion 19 of the two-layer structure also has holes 26, 26 for inserting the bolts 24, 24.
Further, screw holes 27, 27 for screwing the bolts 24, 24 are provided in the cylindrical portion 17 of the winding drum 6 and the hexagonal section 4 of the main shaft 3. In this way, the end portion 19 of the belt 18 can be held between the presser plate 23 and the cylindrical portion 17 by the bolts 24, 24. Further, since the bolts 24, 24 pass through the end portion 19 of the two-layer structure and are screwed onto the winding drum 6, etc., movement of the belt 18 relative to the winding drum 6 can be prevented. Furthermore, the bending portion 3 is held by the latching pin 22.
0 is maintained in a large diameter state and the bent portion 30 is caught on the end surface 28 of the holding plate 23, thereby preventing the belt 18 from moving relative to the winding drum 6. As described above, in this embodiment, the end portion 19 of the belt 18 is securely fixed to the winding drum 6 by three means.

The other end 29 of the belt 18 is fixed to the belt fixing pin 14. This belt 18 is wound around a movable pulley 32 connected to a wire gripper 31, and by operating the handle 9, the belt 18 is wound around the winding drum 6.
The movable pulley 32 can be pulled toward the wire tensioner main body 1 by winding it up.

The movable pulley 32 includes a U-shaped frame 33, an electrically insulating pulley body 34 (for example, made of nylon) rotatably supported by the frame 33, and a connecting fitting 35.
A wire gripper 31 is connected to this movable pulley 32 via a connecting rope 36 made of nylon having electrical insulation properties. The wire gripping device 31 is other than what is shown in the figure.
It goes without saying that various embodiments can be used, and the wire gripper 31 may be directly attached to the movable pulley 32 without the insulating rope 36.

Although a hook 38 is attached to the connecting fitting 16 of the wire tensioner body 1 via a nylon rope 37, it is also possible to have a structure in which the hook is directly attached to the connecting fitting 16.

As shown in the above-mentioned embodiment, in the present invention, one end of the electrically insulating belt 18 wound around the movable pulley 32 connected to the wire gripper 31 is attached to the winding drum 6 of the wire tensioner main body 1. The wire tensioner for live wire work was constructed by fixing the other ends to the belt fixing parts (corresponding to belt fixing pins in the embodiment) of the wire tensioner main body 1, as follows. This effect can be achieved.

Since the wire tensioner body and the moving pulley can be electrically insulated by an electrically insulating belt, an electrically insulating part can be provided between the wire gripper that grips the live wire and the wire tensioner body that performs winding work. . Therefore, compared to the conventional structure in which the handle of the wire tensioner main body and the connecting rope connecting the wire gripper and the movable pulley have an electrically insulated structure, the number of electrically insulated points can be increased by one, improving work safety. You can increase your sexuality. Moreover, although this belt replaces the conventional winding wire, it is essential to the device and does not increase the number of parts. Furthermore, according to the present invention, if the same level of electrical insulation as the conventional example is sufficient, the connecting rope in the conventional example can be omitted and the wire gripper can be directly attached to the movable pulley, which reduces the overall structure of the device. It can be done easily.

Since a belt is used to pull the movable pulley to the wire tensioner body, the belt can be wound up onto the winding drum in an orderly manner, allowing for smooth work.

In this invention, the tensile force when pulling the movable pulley acts on the belt, but the belt can have a large cross-sectional area and has a structure that can sufficiently withstand the tensile force like the conventional wound wire. be able to.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a perspective view thereof, FIG. 2 is a central vertical sectional front view of the main part, and FIG. 3 is a partially cutaway plan view of the main part. 1... wire tensioner body, 6... winding drum, 31... wire gripping device, 32... moving pulley.

Claims (1)

[Scope of utility model registration request] One end of the electrically insulating belt wrapped around a movable pulley connected to a wire gripper is fixed to the winding drum of the wire tensioner body, and the other end is secured to the belt fixing part of the wire tensioner body. Characteristic wire tensioner for live wire work.