JPS6020082Y2 - Wedge-shaped mandrel pushing device - Google Patents

Description

[Detailed Description of the Invention] The present invention proposes the use of a compressed linear sleeve, a compressed detention clamp, a compressed jumper sleeve, or a compressed wire extension clamp (hereinafter referred to as This invention relates to a wedge-shaped mandrel pushing device used to push a wedge-shaped mandrel for protection of an optical fiber cable into the terminal part of the above-mentioned overhead ground wire when compression-connecting it to a compression type clamp.

In recent years, optical fiber cables (hereinafter referred to as optical cables) have been developed and used for communication purposes.

This optical cable has a large information capacity and is not susceptible to electromagnetic induction interference, so it can be enclosed in an overhead ground wire.
No separate communication cable installation required.

Figure 1 is a cross-sectional view showing an example of this optical fiber-containing overhead ground wire (hereinafter simply referred to as overhead ground wire), and 21 is a plurality of aluminum or aluminum alloy wires, aluminum coated steel wires, or galvanized steel wires. The overhead ground wire 23 is composed of a twisted wire that is stronger than a metal wire or a composite wire 22 such as the above, and an optical fiber 20 is enclosed in the center thereof instead of a bare wire.

In this explanation, optical fiber cable (optical cable)
means a wire that has one or more optical communication fibers (glass fibers) as its core and is coated with synthetic resin, or if necessary, a metal pipe or cushioning material is placed on the outside of the wire. Refers to the overlapping cable (see Figure 1).

In order to connect such overhead ground wires, a compressed linear sleeve, an example of which is shown in FIG. 2, is used, for example.

In the figure, there are two steel sleeves 24 on either side of the filling collar 15 that protects the connection protection sleeve of the optical cable in the center, into which the terminal end of the overhead ground wire 23 is inserted and connected by compression.

25 is a central steel sleeve which compressively connects these steel sleeves 24,24.

Aluminum collars 26.26 are arranged on both sides, and a Karumi sleeve 27 is placed over the central steel sleeve 25 and the aluminum collars 26.26, and the outer peripheries are connected by specific pressure.

The optical cable 20 protruding from the end of the overhead ground wire 23 is guided into the central hole 28 and connected by a connection sleeve 29.

In such a compression type linear sleeve, if the end of the overhead ground wire 23 is inserted into the steel sleeve 24 and compressed, the optical cable 20 inside is weak and may be crushed and damaged. , stranded wire 21 and optical cable 2
It is necessary to insert the wedge-shaped mandrel 30 between the holes.

This wedge-shaped mandrel 30 has the shape shown in FIG. 4A, and has a hole 31 through which an optical cable is passed.

The opening in FIG. 4 is a side view showing the end portion of the overhead ground wire to be compressed and connected, in which the optical cable 20 is exposed by a predetermined length from the stranded wire 21 and stripped.

In order to push the wedge-shaped mandrel 30 into such a terminal part, since the overhead ground wire is visible, it is necessary to firmly hold it in a straight state. A gripping device that accommodates the increased diameter is required.

FIG. 3 is a side view showing an example of a compression type retaining clamp for retaining an overhead ground wire to a steel tower.

In the figure, the same reference numerals as in FIG. 2 indicate the same parts.

In the figure, 32 is a steel clamp having a steel sleeve portion 33 into which the end portion of the overhead ground wire 23 is inserted and compressed, and has a clevis portion 34 at the other end.

35 is a part of the steel clamp 32, an aluminum clamp that is compressed and connected over the overhead ground wire 23;
A jumper socket 37 is connected to.

In this case as well, a wedge-shaped mandrel 30 similar to that shown in FIGS. 2 and 4A is inserted into the terminal portion of the overhead ground wire 23, and this insertion poses the same problems as described above.

The optical cable 20 protruding from the end of the overhead ground wire 23 passes through the through hole 38, is guided to the hole in the clevis portion 34, and is further pulled out to the outside of the retaining clamp.

36 is a fitting with a pipe for fixing the pipe 40 that protects the optical cable 20 to the steel clamp 32.

Similar wedge-shaped mandrels are also used for compression type wire clamps, compression type jumper sleeves, etc.

The present invention was developed in order to solve the above-mentioned problems in the device for pushing the wedge-shaped mandrel into the terminal part of the overhead ground wire, and the device for holding the wire has a special structure. This is an optical fiber-containing overhead wire that can firmly hold the end of a flexible overhead ground wire in a straight state, and can change the gripping state according to the increase in the diameter of that part due to the insertion of a wedge-shaped mandrel. The object is to provide a device for pushing a wedge-shaped mandrel into a ground wire.

The present invention, as shown in an embodiment in FIGS. 5 and 6, is a device for pushing a wedge-shaped mandrel 30 into the terminal part of an overhead ground wire containing optical fibers to be compressed and connected, which holds the above-mentioned overhead ground wire in place. The device 4 for this includes three or more gripping die mounting plates 7 arranged at intervals in the axial direction within a frame 6 enclosing the aerial ground wire, and each interval of the mounting plates 7 is The wire gripping die 8-1°8-2. 8-3. . . . means that two or more dies on the tip side of the above-mentioned overhead ground wire are removed from the double-stacked dies that can be inserted into a single direction from both sides of the mounting plate 7, and at least one remaining die is This is a wedge-shaped mandrel pushing device characterized by consisting of a single die.

The terminal part of the overhead ground wire in this invention is a compression type linear sleeve (e.g., Fig. 2), a compression type retaining clamp (e.g., Fig. 3).
, for compression connection to a compression type jumper sleeve or compression type wire clamp, etc.

Fig. 5 is a configuration diagram illustrating an embodiment of the present invention, and Fig. 6 is a diagram showing an example of the electric wire gripping device shown in Fig. 5. Fig. A is a side view thereof, and Figs. FIG. 2 is a front view and a partially cutaway side view of the gripping die, not shown in FIG.

In FIG. 5, reference numeral 23 denotes an overhead ground wire (electric wire) whose terminal part is stripped out with the optical fiber 20 sticking out, as shown in the opening of FIG.
The wedge-shaped mandrel 30 is pressed together between them.

Reference numeral 1 denotes a hydraulic jack, which pushes the wedge-shaped mandrel 30 into the end portion of the overhead ground wire 23 via the pushing jig 3 by operating the pump 2.

Note that the pushing jig 3 has a groove 5 in the length direction as shown in the figure.
is provided, through which the protruding optical cable is passed.

In addition, if the pushing length of the wedge-shaped mandrel 30 is longer than the stroke of the jack 1, a device for adding the pushing jig 3 is provided as necessary.

Reference numeral 4 denotes a wire gripping device, which is configured as shown in FIG. 6, for example.

In FIG. 6, reference numeral 6 denotes a frame that encloses the electric wire 23. Supports 13 are arranged at the four corners, for example, and the support 13 is fixed to the gripping die mounting plate 7 that connects these to form the frame.

However, the frame body in the present invention is not limited to the structure shown in the figure, and the cross section may be polygonal, circular, or other irregular shapes, and it may be constructed of any of rods, plates, shapes, etc. .

Next, 7, 7, . Three or more (five in the figure) are arranged at intervals.

These intervals become gradually narrower toward the tip of the wire.

This is because the force of pushing the wedge-shaped mandrel is greater at the tip of the wire.
This is to ensure that the wires are firmly gripped, as they tend to bend or strand the wires easily.

Of the five gripping dies, 8-1.8-2.8-3 are
When the wedge-shaped mandrel 30 is pushed into the end portion of the electric wire 23, the die grips the portion where the diameter increases, and as shown in the figure, it is cut from a double stacked die.

In the figure, the gripping die 8-1 is a double layered die consisting of dies 9 and 10, each having a different inner diameter, and each is configured to be insertable from the opposite side of the mounting plate 7.
Each is divided into two by a crack 11.

The inner diameter of the inner die 9 is adapted to the outer diameter of the overhead ground wire 23, and the inner diameter of the outer die 10 is adapted to the outer diameter increased by inserting the wedge-shaped mandrel 30 therein.

The number of such double-stacked dies is appropriately selected depending on the length of the wedge-shaped mandrel 30 and the interval between the gripping dies, but at least two or more are required for firm gripping.

Furthermore, the gripping die 8-4, 8-5 is a die that firmly grips the non-core metal insertion part of the electric wire 23, and as shown in Figure 0, it is a single die, and if necessary, it can be inserted into the mounting plate 7, In order to facilitate tightening of the electric wire, a two-split die is used, and a die insertion hole 12 is provided in the mounting plate 7.

At least one such single die is required to firmly grip the electric wire, and the structure is not limited to the structure shown in the figure as long as it has the function of gripping the electric wire.

In order to push the wedge-shaped mandrel 30 into the terminal part of the overhead ground wire 23 using the wedge-shaped mandrel pushing device according to the present invention configured as described above, first, the terminal part is held by the wire gripping device 4 (FIG. 6). Dice 8-1.8-2. The optical cable is held by the wedge-shaped mandrel 30 and the pushing jig 3.
(Fig. 5), insert the mandrel 30, the pushing jig 3,
After setting the jack 1 and the like as shown in FIG. 5, operate the pump 2 to gradually push in the mandrel 30.

As the diameter of the wire 23 increases in a portion due to this pushing of the mandrel, the inner die 9 of the double stacked die (for example, 8-1 in Fig. 6) of that portion is removed and the outer die is removed. Grip with dice 10.

In this way, the wedge-shaped mandrel is easily pushed in while the overhead ground wire 23 is firmly held straight.

As described above, the present invention is a wedge-shaped mandrel pushing device for an optical fiber zero overhead ground wire, and the device for gripping the above-mentioned overhead ground wire is arranged at intervals in the axial direction within a frame surrounding the overhead ground wire. is opened and three or more gripping die mounting plates are arranged and hollowed, and each interval of the mounting plates is narrowed toward the tip side of the above-mentioned overhead ground wire, and the gripping dies of the above-mentioned overhead ground wire are arranged as described above. As shown in the figure, two or more dies on the tip side of the above-mentioned overhead ground wire are double-stacked dies, and at least one remaining die is a single-layered die. While pushing in the metal, it is firmly held in a straight state and pushed in easily, and the inner die of the double-stacked die is removed as appropriate to accommodate the increase in the diameter of the overhead ground wire due to the wedge-shaped mandrel being pushed in. Since it can be gripped by the outer die, there is an advantage that the wedge-shaped mandrel can be pushed in very easily without bending the strands or causing any damage.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of an optical fiber-containing overhead ground wire. FIG. 2 is a side view showing an example of a compression type linear sleeve, and FIG. 3 is a side view of an example of a compression type retaining clamp. FIG. 4A is a side view showing the wedge-shaped mandrel shown in FIGS. 2 and 3, and the opening in FIG. Figure 5 shows the constituent countries for explaining an embodiment of the present invention, Figure 6 is a diagram showing an example of the wire gripping device shown in Figure 5, Figure A is a side view of the device, and Figure A is a side view of the device. FIG. 2 is a partially cutaway side view and a front view of the gripping die shown in FIG. 1...Hydraulic jack, 2...Pump,
3... Pushing jig, 4... Wire gripping device, 5... Groove, 6... Frame, 7...
... Gripping die mounting plate, 8-1.8-2, ...
・8-5...Gripping die, 9,10...
・Dice, 11... Crack, 12...
Dice insertion hole, 13... Rest, 15...
・Filling collar, 20...Optical fiber cable, 21...Twisted wire, 22...Metal wire or composite wire, 23...Overhead ground wire with optical fiber (
Electric wire), 24...Steel sleeve, 25...Sleeve in the middle of the song, 26...Aluminum collar, 27...Song/aluminum sleeve, 28/Song/empty L30 in the center...
...Wedge-shaped mandrel, 31...hole, 32...
Steel clamp, 3...Steel sleeve part, 35...
...Aluminum clamp, 39...Pipe base, 40...Pipe to protect.

Claims (2)

[Scope of utility model registration request] (1) A device for pushing a wedge-shaped mandrel into the end of an overhead ground wire containing optical fiber to be compressed and connected, and the device for gripping the above-mentioned overhead ground wire is arranged at intervals in the axial direction within a frame surrounding the overhead ground wire. is opened and three or more gripping die mounting plates are arranged, the intervals between the mounting plates are narrowed toward the tip side of the overhead ground wire, and the gripping dies of the overhead ground wire are A wedge shape characterized in that two or more dies on the tip side of the overhead ground wire are stronger than double stacked dies that can be inserted into a single stack from both sides of the mounting plate, and the remaining at least one die is a single die. Core pushing device. (2) The number of gripping die mounting plates is 5, and among the 5 gripping dies, 3 are double stacked dies and 2 are single dies. The described wedge-shaped mandrel pushing device.