JP2563942B2 - Retainer for coated messenger wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECT OF THE INVENTION A-1. Field of Industrial Application The present invention, when a low-voltage service cable is stretched between a utility pole and a consumer or between consumers, retains the coated messenger wire and stretches the cable. The present invention relates to a retractor that is adapted to do so.

B-2. Prior Art In recent years, in order to achieve harmony with the urban environment, low voltage distribution cables composed of two cores, three cores, etc. are also used in the service lines of low voltage distribution lines.

By the way, hitherto, as for the retractor installed on the utility pole side or the customer side, the retractor for easily suspending the cable has not been developed yet.

B. Structure of the invention b-1. Means for solving the problems In order to solve the above problems, the present invention suspends both ends of a messenger wire holding a retracting cable by a retainer to suspend the retracting cable. In the above, the retractor comprises a drum-shaped retainer for winding the messenger wire, and a hook fitting rotatably provided on the retainer and hooked on the utility pole side or the consumer side, and The retractor is provided with an intermittent rotation mechanism for adjusting the degree of slack of the cable and a drive operation unit.

-2. Action When a low-voltage service cable is stretched between two points, a messenger wire with a cover is retained by a utility pole or a retainer attached to the house, and the low-voltage service cable is suspended. In the above, the low voltage drop cable has a plurality of core wires (multi-core) and a messenger wire integrated with each other, and at the time of withdrawal, both ends of the cable close to the utility pole or the house side are separated into the messenger wire and the core wire. Then, while winding the messenger wire around the winding portion of the anchor insulator, the wires are wound in order to adjust the degree of slack of the cable. After adjusting the looseness of the cable, fasten the end of the messenger wire to the anchor and secure the wire. The winding of the messenger wire is performed by rotating the retention insulator by fitting a tool such as a ratchet spanner to the retaining portions at both ends of the support shaft, or by inserting a driver into the through hole of the retention insulator.

B-3. Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a retractor (A) of the present invention.
Is a drum-shaped retainer made of porcelain, and has a winding portion (2) consisting of an annular groove in the center, and the thick portions (3) on both sides of the winding portion intersect the axial direction, avoiding the axial center portion. A plurality of through holes (4) are formed at appropriate intervals in the direction. The hole diameter of the through hole (4) is such that a messenger wire (5) of a pull-in cable, which will be described later, can pass through and a driver or the like can be inserted therein. A plurality of (3 at 120 ° intervals) engaging protrusions (6) are formed on the peripheral edges of the left and right side end surfaces of the anchor (1), and a shaft hole having a hexagonal cross section that penetrates in the left-right direction at the center ( 7) is provided. The raised portion (6) starts at the same level as the flat surface portion of the side end surface (6 '), becomes higher sequentially, and then, when it reaches a certain height, it descends vertically to the flat surface portion and becomes lower. It is formed in a slope shape, and they are arranged in the same direction (the same rotation direction). (8) is a metallic support shaft made of stainless steel or the like having a hexagonal cross section as shown in FIG. 3, and does not rotate with respect to the shaft hole (7) of the hexagonal cross section of the above insulator (1). The central insertion part (8a) that is located inside the shaft hole.
A rubber-based heat-shrinkable tube is attached to the inner surface of the shaft hole (7) for the purpose of cushioning, and the coaxial (8) protruding outside the hole
A retaining portion (8b) is formed on both ends of the retaining portion (8b), and the retaining portion (8b) and the inserting portion (8a) are located between the retaining portion (8b) and the inserting portion (8a). An attachment portion (8c) formed to have a slightly smaller diameter is formed.

In this way, the retractor (1) and the support shaft (8) are integrally connected so as not to rotate with respect to each other. Also,
(9) is a hook metal fitting in which a spring-like stainless wire is formed in a bifurcated shape. The metal fitting (9) has a coil portion (9a) on one end and a ring-shaped connecting portion on the opening side end. (9b) are formed respectively. And the hook metal fitting (9)
The above-mentioned connecting part (9b) is inward, that is, the opposite connecting part (9b).
b) The shaft hole (7) is urged so as to narrow the gap.
The support shaft (8) protruding outward is rotatably attached to the attachment portions (8c) at both ends.

In the above, the connecting part (9b) of the hook metal fitting (9)
Is a C-ring shape that is partially separated when it is attached to the attachment portion (8c) of the support shaft (8), and is bent into an O-ring shape that is wholly connected. 9b) can freely rotate with respect to the mounting portion (8c), and the retaining portion (8b) prevents the retaining shaft (8) from falling off.

The connecting structure of the retractor (1) and the support shaft (8) is not limited to the above embodiment, and may be as shown in FIG. That is, the shaft hole (7) of the retractor (1)
The bolt-shaped support shaft (8 ') is inserted through the insulating collar (10), and the support shaft (8') and the insulating collar (10) are aligned with the through holes of the retention insulator (1). After that, a fastening pin (11) such as a spring pin may be inserted into the hole and integrally coupled. In this case, the hook metal fitting (9) has a ring-shaped connecting portion (9b) of the retaining insulator. The support shaft (8 ') protruding outside the shaft hole (7) of (1) is rotatably fitted and attached to both ends of the support shaft (8'). Further, the connecting part (9b) of the hook metal fitting (9) has a support shaft (9b). The hexagonal screw head-shaped retaining portions (8b ') and nut-shaped retaining portions formed at both ends of (8') are engaged to prevent falling off from the coaxial. In the above, the nut-shaped retaining portion is screwed to the screw portion (8d) at the shaft end at the final stage after the mounting of the support shaft (8 ') to the retainer (1) and the hook metal fitting are completed. Further, they are integrally connected by metal pins such as spring pins. (12) shows a stainless steel joint hook hooked on the ring-shaped coil portion (9a) of the hook metal fitting (9), which is hooked to the hook for attaching the retractor attached to the utility pole side or the customer side. Then, the retractor (A) is connected.

Next, a method of attaching the retractor (A) having the above structure will be described.

As shown in FIG. 10, the large-diameter low-voltage cable (24) branched from the low-voltage trunk line (17) by the connector (18) and pulled down is used in the low-voltage lead-in box (14) installed in the middle of the utility pole (13). ) Is connected to the branching bar for each phase (each line). Further, the branch bar is provided with a plurality of branch terminals, and a fuse is connected to each branch terminal. Further, each wire (usually four circuits are provided) of the small-diameter lead-in cable (15) connected through the fuse is led out from the lower output end of the low-voltage lead-in box. Then, each of the service cables (15) derived from the service boxes is connected to the electricity meter (21) attached to the customer (19) on the roof side (20) of the customer (19) and is further connected to the electricity meter. It is connected to each wiring inside via.

In the above case, as the low voltage lead-in cable, a multi-core (3-core) cable (see Fig. 11) with a messenger wire made of steel wire is used.
5) is the messenger wire (5) and the thin-walled connection (15
Although it is configured to be separable in a), it is also possible to use a messenger wire and a cable separately configured as the lead-in cable.

The low voltage service cable (15) is retracted as follows. As shown in FIG. 10, the hook metal fitting (9) of the retractor (A) is attached to the hook portion (16 ′) of the mounting band (16) which is fastened and fixed to the electric pole (13) through the joint hook (12). ) To connect the retractor (A).

In this way, the retractor on the utility pole (13) side is attached.
Similarly, on the customer (19) side, the shop side (20)
On the other hand, a foot-length screw nail (22) having a hook portion (22a) is fixed, and the retractor (A) is connected to the hook portion of the fixed screw nail via the joint hook (12). In addition, these hooks for mounting such as screw nails are directly attached to the roof side or attached to the roof side through the reinforcing lead-in angle, but when the building is reinforced concrete, etc. A method of embedding a mounting nut in a predetermined place on the roof side and fixing a screw nail (metal fitting) to this nut by screwing is mainly performed from the viewpoint of strength and workability.

In this way, the retractor (A) on the customer side is attached. Next, the messenger wire (5) and the cable body (15) are separated at both ends of the low-voltage lead-in cable (15) near the electric pole (13) side and the customer side, respectively.

The messenger wire (5) and the cable body (15) are integrally separated from each other by a metal binding wire (23) at the non-separated parts (at least two parts) so that the messenger wire and the cable are not separated. Tying is done.

Next, on the side of the electric pole (13), the separated messenger wire (5) is attached to the winding portion (2) of the anchor (1).
After winding the wire more than once, insert the end (5 ') of the wire (5) into the through hole (4) of the thick portion (3) to penetrate the wire, and further insulate the tip of the wire protruding from the opposite side of the hole. Peel off. The peeled portion has a metal crimp pipe (17) having a diameter larger than the diameter of the through hole (4).
Are crimped so that the wire (5) does not come out of the through hole (4). If necessary, an insulation cap (18) is attached to the crimp pipe (17) (see FIG. 15).

On the consumer side, the other end of the separated messenger wire (5) is wound around the winding portion (2) of the retention insulator (1) of the retention tool (A) from above to below. That is, the messenger wire is hung on the anchor (1) one or more times in a pulley shape. Then pull the wire downward to pull the cable.

When the messenger wire (5) is pulled downward as described above, the support shaft (8) integral with the anchor insulator (1) rotates around the connecting portion (9b) of the hook metal fitting (9), thereby causing the insulator. (1) also rotates integrally. In this case, the detent insulator (1) is engaged with the portion where the engaging end (6a) of the engaging protrusion (6) formed on the side surface thereof is in proximity to the connecting portion (9b) of the hook metal fitting (9) and is rotated as described above. Rotation in the opposite direction, that is, reverse rotation, is prevented. (This is called an intermittent rotation mechanism.) When the messenger wire (5) is pulled to some extent, the end of the wire is then inserted into the through hole (4) of the anchor (1) and the tip is slightly opposite to the hole. Make it protrude. In the above description, if the messenger wire (5) is wound once or more on the winding portion (2) of the insulator, and if the pulling cable (15) still has slack, the support shaft ( 8) Hexagonal stoppers (8b) on both ends
(Note that the shape of the retaining portion is not limited to hexagonal shape and may be a square shape or more.) A tool such as a ratchet spanner (spana, monkey) is fitted to the coaxial, that is, the retention insulator to rotate in the above-mentioned rotation direction. Then, the cable is rotated in the same direction as above, and the same wire is further wound around the winding portion (2) to adjust the sag of the cable. As another method of adjusting the sag, insert a screwdriver or the like into any of the through holes (4) and rotate the retention insulator (1) in the same direction as the above rotation direction to adjust the sag of the cable. May be.

When the sag adjustment is completed as described above, the messenger wire (5) protruding to the opposite side of the through hole (4)
Similarly to the terminal treatment on the side of the electric pole, the coating is peeled off from the end of the above, and a crimp pipe having a diameter larger than the hole diameter of the through hole (4), for example, a copper crimp pipe (17) is caulked at the end. Make sure that the wire does not fall out of the hole.
Then, if necessary, the insulation cap (18) is attached to the crimp pipe (17).

As for the low voltage lead-in cable suspended from the utility pole side and the puller attached to the customer side as described above, when the messenger wire (5) is overwound and it is desired to rewind it, or even when the cable is reattached. If it becomes necessary to remove the wire (5) during replacement,
For example, if an expansion tool formed in a tapered taper shape, that is, a wedge shape is inserted between the linear portions of the hook metal fitting (9), the linear portions are pushed outward and the portions are retracted insulators (1). The messenger wire can be removed by disengaging it from the engaging ridge (6) and allowing the retractor (1) to freely rotate. It can also be done with an extension tool (19) consisting of an improved snap ring pliers. That is, the fitting recess (2
(0) is brought into contact with the inside of the connecting portion (9b) of the hook metal fitting (9) and the connecting portion (9b) is expanded outward, so that the straight portion of the hook metal fitting and the raised protrusion of the retention insulator (1). Division (6)
Since the engagement relationship of the reverse rotation preventing device composed of and is released and the detention insulator (1) can be freely rotated, the ratchet is fitted to the retaining portion (8b) of the support shaft (8), and The messenger wire can be loosened and the messenger wire can be removed by rotating the retractor insulator (1) integrated with the coaxial shaft in the direction opposite to the winding direction. The messenger wire (5) will be loosened and the messenger wire can be removed in the same manner as above by rotating the retractor insulator (1) in the reverse direction with the screwdriver inserted in the through hole (4) of the winding section (2). it can.

Although the above embodiment has described the case where the low voltage service cable is stretched between the utility pole and the customer, the detention of the present invention is also applied when the service cable is stretched between adjacent customers. The ingredients are of course usable.

C. EFFECTS OF THE INVENTION According to the present invention, the messenger wire of the cable wound around the retractor of the retractor is gradually wound by intermittently rotating the insulator, so that the slack adjustment work of the low voltage retractable cable is simplified. There are features that can be done. Further, in the above, since the pulling tool is provided with an intermittent rotation mechanism composed of a pulling insulator and a hook metal fitting that allows the pulling insulator to be rotated intermittently only in the winding direction, an error may occur during the winding operation. Therefore, even if the worker loosens his hand or releases it, the retractor does not reversely rotate and the wire does not return to its original position, so the suspended condition of the cable can be maintained as it is, which is an advantage that the work is easy.

In addition, the retractor has a drive operation part for rotating the retractor (a screw head shape or nut shape retaining part at both ends of the support shaft that can be operated with a hand-held tool such as a ratchet spanner, or a driver. Since it has a possible through hole), the insulator can be easily and easily rotated when the messenger wire is wound.
In addition, even if the cable burns due to fire or the like, the messenger wire with both ends retained can prevent the cable from hanging or dropping, and can prevent electric shock due to the cable and improve safety.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a side view of a retractor, FIG. 2 is a plan view of the same, FIG. 3 is a front view of a support shaft, and FIG. 4 (A) is FIG. 4 is a sectional view taken along the line BB in FIG. 3, FIG. 5 is a side sectional view showing the connecting structure of the support shaft and the anchor, and FIG. Same as above, a side sectional view showing another embodiment, FIG. 7 is a front view of a support shaft in the same other embodiment, and FIGS. 8 and 9 are side views and plan views showing another embodiment of the retractor. FIG. 10 is a schematic view showing a retracted state of the cable for low-pressure retracting, FIG. 11 is a perspective view of a cable wire, FIG. 12 is a utility pole side, and FIG. 13 is a perspective view showing a state of attaching retractors to the house side, respectively. FIG. 14 is a perspective view showing a messenger wire fastening device, and FIG. 15 is an enlarged view of the hook metal fitting for releasing the engagement between the engaging protrusion of the anchor and the hook metal fitting. To is a front view of the tool. (A) ...... Retractor (1) ...... Retractor (2) ...... Winding part (4) ...... Through hole (6) ...... Engagement protrusion (8) ...... Support shaft (8b) ...... Cap (9) …… Hook bracket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masuda Sasada No. 35 Fukakuma, Nagakusa-cho, Obu-shi, Aichi Japan High Voltage Electric Co., Ltd. Technical Research Institute (72) Tsutomu Yamada 35 Fukaku-machi, Nagakusa-cho, Obu, Aichi Japan High Voltage Electric Co., Ltd. Technical Research Institute (72) Inventor Kamo Kamo 52-1 EBARA, Shinagawa-ku, Tokyo Saneisha Co., Ltd. (72) Inventor Hitoshi Honma 5-2-1 EBARA, Shinagawa-ku, Tokyo No. 1 inside Saneisha Co., Ltd.

Claims (1)

(57) [Claims] 1. A messenger wire for holding a pull-in cable, wherein both ends of a messenger wire are retained by a pulling tool to suspend the pull-in cable, wherein the pulling tool is a drum-shaped retainer for winding the messenger wire. A hook metal fitting rotatably provided on the detention insulator and hooked on the utility pole side or the customer side, and the detention insulator is equipped with an intermittent rotation mechanism and a drive operation unit for adjusting the slack of the cable. A retractor for a messenger wire with a coating, which is characterized in that