JPH051930Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a type that firmly grips the overhead wire by pressing the end surface of the wedge with the cam structure end surface of the handle head when gripping the overhead wire with a come-along wedge. This is related to the improvement of the come-along.

(Prior Art and Problems to be Solved) FIG. 3 is a partial side view of an example of a conventional come-along. In the drawing, 1 is the upper come-along body, 2 is the lower come-along body, and the taper pin 5
are fastened together to form a single body. 3 is the upper wedge;
4 is a lower wedge, and the upper wedge 3 and the lower wedge 4 are inserted in combination inside the above-mentioned come-along bodies 1 and 2, and an insertion hole for an overhead electric wire is formed inside the combination.

Also, 6 is the handle, 7 is the handle head, and both are pin 2.
The handle head 7 is pivotally connected by a pin 23 to an extension 21 integrally formed with the end of the lower come-along main body 2 and projecting therefrom.

By attaching a rope or the like to the tip of the handle 6 and pulling it, the handle head 7 rotates about the pin 23, and the cam structure end face 7a of the handle 6 rotates around the wedge 3 in the cam-along bodies 1, 2. Press the end face of 4. As a result, the wedges 3 and 4 move in the direction of the arrow and forcibly grip the overhead wires inserted therein.

In such a conventional cam-along, since the pin 23, which is the center of rotation of the handle head 7, is located below the center line A-A of the wire insertion hole inside the wedges 3, 4, the cam structure of the handle head 7 is The end surface 7a is the wedge 3,
When the end faces of wedges 4 are pressed, a downward force acts on the come-along, and a bending force acts on the overhead wires passing through the wedges 3 and 4 at their exits. When such a force acts on the wire,
If the wire has an optical fiber built-in, such as an optical fiber composite overhead ground wire, bending force will be applied to the optical fiber, increasing the transmission loss of the optical fiber and degrading the transmission characteristics. There is a problem with making it happen.

In order to solve the above-mentioned problems, a come-along has been proposed in which the rotation center of the handle head 7 is located on the same axis as the wire insertion hole inside the wedges 3 and 4. (Refer to Utility Application No. 61-140896) Figure 2 is an explanatory diagram _of such a newly proposed come _- along. It is.

As shown in the drawing, the end of the lower come-along body 2 has a longitudinal elongated hole 11 projecting therefrom.
Handle mounting bracket 1 of two parallel plate-like members having
0 is integrally formed, and the center line of the elongated hole 11 is the insertion hole 1 of the overhead wire 16 formed by the wedges 3 and 4.
It is located on the same axis as 5.

On the other hand, the handle head 7, which has a cam structure end face 7a that presses the end faces of the wedges 3 and 4, is rotatably attached to the handle attachment fitting 10 by a pin 12.
The lower connecting part 8 has a pin 1 attached to one end of the connecting fitting 9.
3, and the other end of the connecting fitting 9, together with the end 6b of the handle 6, is attached to an integral pin 14 that moves within the elongated hole 11 of the handle mounting fitting 10.

In such a come-along, as in the past, when the rope attached to the tip of the handle 6 is pulled,
The pin 14 to which the U-shaped end 6b of the handle 6 is attached moves inside the elongated hole 11 of the handle attachment fitting 10 to the left side in the figure. Along with this, the positional relationship between the handle head 7 and the connecting fitting 9 opens around the pin 13, and the cam structure end surface 7a of the handle head 7 presses and moves the end surfaces of the wedges 3 and 4, penetrating the inside thereof. Firmly grasp the electric wire 16.

At this time, the pin 14, which is the base point for applying a pressing force to the cam structure end surface 7a of the handle head 7, is attached to the handle attachment fitting 10, which is on the same axis as the wire insertion hole formed by the wedges 3 and 4, as described above. Since it moves in parallel within the elongated hole 11, the pressing force of the cam structure end face 7a is only in the axial direction of the electric wire, and no force such as bending is applied to the electric wire.

However, in the above-mentioned come-along, as shown in FIG. The U-shaped end 6b will be attached from the outside of the handle fitting 10, and the pins 14 will attach the handle end 6b to the handle fitting 10 in a cantilevered structure on each side.

In this way, the handle attachment fitting 10 of the handle end 6b
Since it is attached using a cantilever structure, there are problems with mechanical strength such as torsion. For this reason, the handle end 6b needs to have a sturdy structure that can withstand mechanical strength, but the weight increases significantly, and in some cases, it may be equal to or close to the weight of the main body of the come-along, resulting in a dangerous high-speed There are problems in terms of handling and safety for come-alongs used in places.

(Means for Solving the Problems) The present invention provides a come-along that eliminates the above-mentioned problems.The feature of the present invention is that in the come-along having the structure shown in Fig. 2, the handle mounting bracket is wedged. A handle head 7 having a cam structure end surface 7a is rotatably mounted on the handle mounting bracket 10 with a pin 12, and is provided below the extension line of the overhead wire insertion hole to be formed. Part 7
The other end of the connecting fitting 9 connected to the lower connecting part 8 of the handle fitting 10 by the pivot 13 is connected to the elongated hole of the handle fitting 10 on the inside of the two parallel plate members of the handle fitting 10 together with the handle end 6a. This is because it is attached to a single pin 14 that moves within 11.

(Example) Fig. 1 is an explanatory diagram of a specific example of the come-along according to the present invention, in which A is a side view and B is a side view of _X1 in the figure.
−X ₁ arrow view, and C is a top view.

As shown in the drawing, at the end of the come-along lower body 2, there are two parallel plate-like handle attachment fittings 10 that protrude from the end of the come-along lower body 2. It is located slightly below the extension line of the hole 15 and is integrally formed. A handle head 7 is rotatably mounted on the handle attachment fitting 10 by a pin 12, and the handle head 7 is connected to a connecting fitting 9 by a pin 13 at its connecting portion 8.
The end of the connecting fitting 9, together with the end 6a of the handle 6, is attached to one pin 14 that moves within the elongated hole 11 of the handle attachment fitting 10.

At this time, since the electric wire 16 does not pass inside the two parallel plate members of the handle attachment fitting 10 as shown in FIG. 2, as is clear from FIG.
The U-shaped end 6a of the handle 6 is located inside the two parallel plate-like members of the handle mounting bracket 10, and the end of the connecting bracket 9 is located within the U-shape of the handle end 6a. and one pin 1 that passes through them.
It is installed on 4.

In such a come-along, when the rope attached to the tip of the handle 6 is pulled, the end 6 of the handle 6
The pin 14 with the attached part a moves inside the long hole 11 of the handle mounting bracket 10 to the left side in the figure, and as a result, the positional relationship between the connecting part 8 and the connecting bracket 9 opens around the pin 13, and the handle head 7 rotates around the pin 12, and its cam structure end surface 7a presses and moves the end surfaces of the wedges 3 and 4, firmly gripping the electric wire 16 passing through the inside thereof. This operation is shown in FIG. It's no different from the come-along shown.

(Operations and Effects) As described above, the come-along of the present invention has the handle attachment fitting located below the extension line of the wire insertion hole formed by the wedge, so that the connection fitting of the handle head and the handle Since the end portion can be attached to the inside of the handle attachment fitting with an integral pin in the elongated hole, the mechanical strength of the attachment portion can be significantly increased and the weight can be reduced. This is particularly effective for come-alongs used in dangerous high places.

On the other hand, compared to the come-along shown in Fig. 2, the position of the pin, which is the base point for applying a pressing force to the end surface of the cam structure of the handle head, is located a distance l below the axis of the electric wire. A downward force will be applied, but this distance l is the distance between the conventional electric wire axis and the base pin shown in Figure 3.
It is much smaller than l', and in this respect it can be said to have solved the problems of conventional come-alongs.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a specific example of the come-along according to the present invention, in which FIG. 1 is a side view, and FIG. 2 is an _X1 view of FIG.
FIG _. 2 is an explanatory diagram of the previously proposed come-along.
FIG. 3 is a partial side view of an example of a conventional cam-along. 1 _, 2: cam _- along body; 3, 4: wedges;
6: handle; 6a: handle end portion; 7: handle head portion; 7a: cam structure end surface; 8: connecting portion; 9:
...Connecting fitting, 10...Handle mounting fitting, 11...Slotted hole, 12, 13, 14...Pin, 15...Wire insertion hole, 16...Overhead wire.

Claims (1)

[Scope of utility model registration request] The come-along main body is made up of a combination of two members, the upper main body 1 and the lower main body 2, and the handle fittings 10 are two parallel plate-like members that are integrally formed and protrude from the end of the lower main body 2. The handle attachment fitting 10 has a handle head 7 having a cam structure end surface 7a, which is located below the extension line of the overhead wire insertion hole formed by the wedges 3 and 4 inserted into the come-along main body. is attached rotatably by a pin 12, and the other end of the connecting fitting 9, which is connected to the connecting part 8 at the lower part of the handle head 7 by a pivot 13, is parallel to the handle mounting fitting 10 together with the handle end 6a. A single pin 14 is attached to the inside of the two plate-like members that move within the elongated hole 11 of the handle attachment fitting 10, and the pin 14 moves within the elongated hole 11 when the handle 6 is pulled. death,
As a result, the cam structure end surface 7a of the handle head 7 presses the end surface of the wedge and moves it in the axial direction, thereby gripping the overhead electric wire passing through the inside of the wedge.