JP2007200797A - Cable protection cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a cable protection cap for protecting a connector connected to an end part of a communication cable from damages. <P>SOLUTION: Inside a tapered cylindrical body that consists of half portions 16a, 16b, a connector connected to an end part of the cable 1, a cylindrical protector, a clamping tool, and a clamping plate are formed, as well as, a locking part shaped in conformity with them so as not to have them move in the length direction. A metal tube body 17 is insertingly-coupled with a rear part of the cylindrical body, and the half portions 16a, 16b are key-locked by a key-lock member 18 so as to hold the cylindrical body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cable protection cap applied when a connector is provided at an end of a cable.

  For connecting conventional multi-core cables for railway signals, for example, as in Patent Document 1, 40 to 80 signal lines in the cable to be connected are pressed one by one at the installation site, and then the connecting portion is connected. Usually, the work is housed in a protective case, and the resin is poured into the protective case for insulation. Therefore, the work is often performed at night when a train does not pass to ensure sufficient work time.

  Also, the end of the cable using the conventional connection method can be transported to the installation site in such a state that a large number of signal wires as described above are stripped from the cable and the tape is wound around or protected with an insulating bag. However, there are few problems.

  However, recently, with the diversification of train operating hours, the time when trains do not pass has become shorter, making it difficult to complete connection work within the time when trains do not pass.

  Therefore, a caulking type connector that can complete the connection work in a much shorter time than such a conventional connection method has begun to be studied.

JP 11-27820 A

  However, in the case of a caulking type connector, since it is necessary to shorten the working time at the installation site, necessary terminal processing such as attachment of the connector to the cable end is performed in advance in the factory. Therefore, it has a more precise structure than the end of the cable used in the conventional connection method. Therefore, when transporting from the factory to the installation site, the connector provided at the end of the cable is damaged, or foreign objects in the connector are removed. There is a need for a protective cap to prevent intrusion.

  An object of the present invention is to provide a cable protection cap that solves the above-described problems and that is less likely to damage a connector attached to the tip during transportation or laying.

  The technical feature of the cable protection cap according to the present invention for achieving the above-mentioned object is a cable protection cap that protects the end of a multi-core communication cable with a connector connected to the end and has a tapered tip. At least two halves divided in the longitudinal direction are combined into one cylinder, and at least a space for accommodating the connector and a member attached to the cable end are locked in the half. And having a locking portion.

According to the cable protection cap of the present invention, since the member attached to the tip of the cable is locked, there is no possibility of damaging the connector during transportation or laying.

  The present invention will be described in detail based on the embodiments shown in the drawings.

  FIG. 1 is a longitudinal sectional view of the embodiment, FIG. 2 is a perspective view of a state in which the tip of the cable is covered with a half of a protective cap, and FIG. 3 is an exploded perspective view.

  A large number of electric wires 2 in the cable 1 are connected to a large number of connection terminals housed in a connector 3 made of synthetic resin. Since each electric wire 2 is sealed between the housing of the connector 3 by a sealing member, water does not enter the connector 3 from the rear of the connector 3.

  Behind the connector 3, a so-called tockle-shaped tubular protector 4 made of a synthetic resin or metal and having a central portion bulging outward is connected. The connector 3 side of the cylindrical protector 4 is formed in a shape that fits in the rear part of the connector 3 and covers the rear part via a seal member. A cylindrical grommet 6 made of synthetic rubber is interposed between the cylindrical protector 4 and the insulating coating layer 5 of the cable 1, and a flange portion 6 a at the end of the grommet 6 is a rear end portion of the cylindrical protector 4. It is made to contact | abut to this ring part 4a. The inner surface and the outer surface of the grommet 6 are formed in a corrugated shape in cross section, and the intrusion of water from the rear into the cylindrical protector 4 is prevented by this corrugated shape.

  Furthermore, a synthetic resin cylindrical cover 7 and a fastener 8 are inserted on the insulating coating layer 5 behind the cylindrical protector 4. The cylindrical cover 7 is fitted to the rear end portion of the cylindrical protector 4 from the outside, and is locked by a flange portion 7a at the tip, and is attached to the cylindrical portion 7b of the cylindrical cover 7 provided with the flange portion 7a at the tip. Are provided with a plurality of slits 7c for enlarging the outer diameter of the cylindrical portion 7b, and a screw portion 7d is provided inside the cylindrical cover 7.

  The fastener 8 is provided with a small-diameter portion 8a at the front end, a flange portion 8b in the middle, and a large-diameter portion 8c at the rear end. A screw portion 8d is provided on the outer shape of the small-diameter portion 8a, and the flange portion 8b has a front portion. Two pins 8e protrude toward the end, and a threaded portion 8f is provided outside the large diameter portion 8c. The threaded portion 7d of the cylindrical cover 7 is fixed to the threaded portion 8d of the small diameter portion 8a by screwing, and a separate hexagonal shape as shown in FIG. 4 is provided between the tubular cover 7 and the flange portion 8b. And the like, and pins 8e protruding from the flange portion 8b are loosely fitted in the two arc grooves 9a provided in the polygon ring 9, respectively.

  On the insulating coating layer 5 in the large-diameter portion 8c of the fastener 8, a first sleeve 10 made of a synthetic resin or a metal such as an aluminum alloy whose rear surface is a tapered surface, and a synthetic rubber whose front and rear surfaces are tapered surfaces. And a second sleeve 12 having the same material as that of the first sleeve 10 is inserted. Further, a synthetic resin fastening plate 13, a synthetic rubber exterior grommet 14, and a synthetic resin exterior fastening plate 15 are sequentially arranged on the insulating coating layer 5.

  The fastening plate 13 has a threaded portion 13a that is screwed into the threaded portion 8f of the large-diameter portion 8c, and a hexagonal nut portion 13b at the rear. The exterior fastening plate 15 has a threaded portion 15a on the outside and a flange portion 15b on the outer periphery. is doing. Then, the second sleeve 12 is pressed forward via the pressing ring portion 12a by rotating the hexagonal nut portion 13b and screwing the screw portion 13a of the fastening plate 13 to the screw portion 8f of the fastening tool 8. The clamper bush 11 is sandwiched between the first and second sleeves 10 and 12 and is firmly tightened on the insulating coating layer 5 by increasing the inner and outer diameters.

  The threaded portion 15a of the exterior fastening plate 15 is screwed into an inner threaded portion 16c at the end of a protective cap 16a, 16b, which will be described later, and is fitted to the outer end of the protective cap 16a, 16b, for example, a thin metal made of SUS. The tube body 17 is locked by the flange portion 15b.

  The protective caps 16a and 16b made of two halves are made of synthetic resin or metal for protecting the connector 3 by adhesion, and the tip of the substantially cylindrical body is tapered like a warhead, for example. Has a head. In the protective caps 16a and 16b, at least one member such as the connector 3, the cylindrical protector 4, the fastener 8 and the fastening plate 13 attached to the end of the cable 1 is prevented from moving in the longitudinal direction. An annular groove 16d that matches these shapes is formed as a locking portion. Furthermore, a hexagonal polygonal recess 16e into which the outer shape of the polygonal ring 9 is fitted is formed as a locking part so that the end of the cable 1 does not rotate in the circumferential direction.

  These locking portions may be provided on either half of the protective caps 16a and 16b. However, the two split protective caps 16a and 16b have the same shape in terms of mold and cost. It is preferable to do. Although not shown in the figure so as not to cause a shift in the joint portion, a protruding ridge portion and a concave ridge portion that are meshed with each other are formed, and a pair of bosses 16f and a boss hole 16g are provided at the tip. Yes.

  A low step portion 16h is provided at the rear outer ends of the protective caps 16a and 16b. The metal tube body 17 is inserted into the low step portion 16h, and the two protective caps 16a and 16b are held as a cylindrical body. . An exterior fastening plate 15 is attached to the rear of the protective caps 16a and 16b via an exterior grommet 14. By screwing the threaded portion 15a of the exterior fastening plate 15 into the threaded portion 16c of the protective caps 16a and 16b, the exterior fastening plate 15 is integrated with the protective caps 16a and 16b, and the metal tube body 17 is secured by exterior fastening. The plate 15 is locked by the flange portion 15b. Furthermore, the protective caps 16a and 16b are locked together by fitting two locking members 18 having a substantially C-shaped cross section into the distal ends of the two protective caps 16a and 16b.

  The assembly on the cable 1 side including the connector 3 and the cylindrical protector 4 is in principle performed at the factory. In assembling, the exterior fastening plate 15, the metal tube body 17, the exterior grommet 14, the fastening plate 13, the second sleeve 12, the clamper bush 11, and the first sleeve are sequentially formed on the insulating coating layer 5 of the cable 1. 10. The fastener 8, the grommet 6, and the cylindrical protector 4 to which the polygonal ring 9 and the cylindrical cover 7 are attached are inserted.

  Next, the insulation coating layer 5 at the tip of the cable 1 is peeled off, and a large number of wires 2 are exposed, for example, about 10 to 15 cm, and then connection terminals are connected to the respective wires 2 respectively. 3 is inserted from the rear. Subsequently, each electric wire 2 is brazed into a swollen shape that matches the inner surface shape of the cylindrical protector 4 using, for example, a jig. Subsequently, while extending the electric wire 2, the cylindrical protector 4 is drawn toward the connector 3 to cover the electric wire 2, and the front end portion of the cylindrical protector 4 is connected to the connector 3.

  After that, the insulating coating layer 5 is fed to the connector 3 side to bend along the inner surface of the cylindrical protector 4 as the electric wire 2 is brazed. Then, the grommet 6 is pushed into the gap between the insulating coating layer 5 and the rear end portion of the cylindrical protector 4 until the flange portion 6a of the grommet 6 abuts on the ring portion 4a at the rear end portion of the cylindrical protector 4. The inside of the protector 4 has a waterproof structure.

  Furthermore, the fastening tool 8 fitted with the cylindrical cover 7 and the polygonal ring 9 is brought into contact with the cylindrical protector 4, and the cylindrical portion 7 b of the cylindrical cover 7 is fitted to the rear end portion of the cylindrical protector 4. In this case, since the cylindrical portion 7b is provided with the slit 7c, the diameter of the cylindrical portion 7b is increased and fitted to the rear end portion of the cylindrical protector 4, and the ring portion of the cylindrical protector 4 is provided by the flange portion 7a provided at the front end. Lock to 4a.

  The first sleeve 10, the clamper bush 11, and the second sleeve 12 are pushed into the large-diameter portion 8c of the fastener 8, and the screw portion 13a inside the tightening plate 13 is inserted into the screw portion 8f of the large-diameter portion 8c. The part 13b is screwed by applying a tool and rotating. As a result, the pressing ring portion 12 a of the second sleeve 12 is pushed forward, and the tapered surface of the clamper bush 11 is pressed by the tapered surfaces of the first and second sleeves 10 and 12. By pressing the taper surface, the clamper bush 11 enlarges the inner and outer diameters to strongly tighten the insulating coating layer 5, and the fastener 8 is firmly fixed on the insulating coating layer 5.

  Subsequently, the exterior grommet 14 is applied to the rear portion of the tightening plate 13, the threaded portion 15 a of the exterior tightening plate 15 is screwed into the threaded portion of the protective caps 16 a and 16 b, and the exterior tightening plate 15 is rotated. The metal tube body 17 is locked by the tightening and the flange portion 15 b and locked by the locking member 18. Inside the protective caps 16a, 16b, the same polygonal concave portion 16e into which the polygonal ring 9 is fitted is formed. Therefore, when the two protective caps 16a, 16b are attached and the joining surfaces are matched, the polygonal concave portion 16e is formed. The polygon ring 9 can be fitted even if the outer shape does not match the angle.

  In other words, even if there is a phase difference in the angle, the polygonal ring 9 can be rotated by a certain angle by the circular arc groove 9a. Therefore, by strongly aligning the two protective caps 16a and 16b, the polygonal ring 9 The ring 9 rotates naturally and fits into the polygonal recess 16e of the protective caps 16a and 16b.

  The fastening tool 8 is strongly fixed to the insulating coating layer 5 via the clamper bush 11, and the movement of the fastening tool 8 in the front-rear direction is prevented by the annular groove 16 d, and further, the fastening tool 8 cannot be rotated via the polygonal ring 9. Are fixed to the protective caps 16a and 16b. Further, when the locking member 18 is attached, the protective caps 16a and 16b are firmly fixed to the outer periphery of the connector 3 or the like as shown in FIG.

  FIG. 6 shows a modified example of the protective caps 16a and 16b. When the annular caps 16i and 16j are formed at the tips of the protective caps 16a and 16b, respectively, and the protective caps 16a and 16b are integrated, The latching portions 16i and 16j are also combined. A pulling rope 22 to be described later can be tied to the latching portions 16i and 16j.

  When transporting, as shown in FIG. 7, the cable 1 is wound around the drum 21, and the end of the cable 1 to which the protective caps 16 a and 16 b shown in FIG. 5 are attached is fixed to the drum 21 by the pulling rope 22.

  The cable 1 transported to the construction site is attached by unwinding the rope 22 from the drum 21 and pulling it from the drum 21 using the rope 22. Even if the protective caps 16a and 16b are pulled by the rope 22 during this transportation or laying, the internal connector 3 etc. are locked to the protective caps 16a and 16b in the front-rear direction and the rotational direction. It will not be damaged.

  In this manner, the rope 22 and the locking member 18 are removed from the protective caps 16a and 16b at the ends of the cable 1 arranged at predetermined positions, and the threaded portion 15a of the exterior fastening plate 15 is loosened to move the metal tube body 17 backward. Then, remove the protective caps 16a and 16b. Then, the connector 3 is abutted and fitted to the connector 3 of the mating cable having the same configuration. Note that the butted connectors 3 are male and female, respectively.

  In this case, even if the orientations of the connectors 3 do not coincide with each other and the orientations of the connectors 3 are opposite to each other, if the connectors 3 are rotated by 90 degrees, the connectors 3 can face each other. . Since the electric wire 2 swells and bends in the cylindrical protector 4, the cylindrical protector 4 can be applied to the insulating coating layer 5 of each cable 1 even if the orientations of the connector 3 and the mating connector do not match. By rotating together, the connectors can be fitted with each other facing each other. In the embodiment, since the number of connection terminals is large, the fitting is performed by lever action by the lock lever 3 a provided in the connector 3.

It is a longitudinal cross-sectional view of an Example. It is a perspective view of the state where the cable front-end | tip part was covered with the half part of the protective cap. It is a disassembled perspective view. It is a perspective view of a polygonal ring. It is a perspective view in the state where a protection cap was attached to the cable tip. It is a perspective view of the modification of the state which attached the protective cap to the cable front-end | tip part. It is a perspective view of the state where the cable was wound around the drum.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cable 2 Electric wire 3 Connector 4 Cylindrical protector 5 Insulation coating layer 7 Cylindrical cover 8 Fastening tool 9 Polygonal ring 10, 12 Sleeve 11 Clamper bush 13 Tightening plate 14 Exterior grommet 15 Exterior fastening plate 16 Protective cap 17 Metal tube Body 18 Locking member 21 Drum 22 Tow rope

Claims (6)

  A cable protection cap that protects the end of a multi-core communication cable with a connector connected to the end and has a tapered tip, and is formed by combining at least two halves that are divided in the longitudinal direction into a single cylinder. The cable protection cap characterized in that the half has at least a space for accommodating the connector and a locking portion for locking a member attached to the cable end.   The cable protection cap according to claim 1, wherein the locking portion locks a member attached to the cable end portion in the front-rear direction.   The cable protection cap according to claim 2, wherein the locking portion locks a member attached to the cable end portion in a rotation direction.   The cable protection cap according to claim 1, wherein the cylindrical body is provided with a locking member that holds the halves together.   The cable protection cap according to claim 4, further comprising a recess for housing the locking member on an outer peripheral surface of the cylindrical body.   The cable protection cap according to claim 1, further comprising a hooking portion for hooking a pulling rope on the cylindrical body.

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