JPH0534191Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a closure for a cable connection part used for a connection part of a cable incorporating an electrical conductor and/or an optical transmission body as a core wire.

[Conventional technology]

As is well known, a communication cable has either or both of an electrical conductor core wire (metal core wire) and an optical transmission core wire (optical fiber core wire) built into its cable sheath. The closure of the cable connection section described above is generally constructed as shown in FIGS. 9 to 11 or as shown in FIG. 12, corresponding to the cable connection section. Below, these cable connection parts and closures will be explained. In the conventional example shown in FIGS. 9 to 11, the pair of cables 1 is formed by connecting the core wires 2 pulled out from the ends of these cables pair by pair to form a core wire connection portion (not shown). Ru. A closure for covering such a core wire connection part is
Mainly made of plastic sleeve 3,
The sleeve 3 is vertically divided into two parts, and a flange 5 provided along the split surface 4 is connected to a bolt 6.
By connecting with a nut 7, they are combined into a cylindrical shape. The split surface 4 is sealed by a packing 8 interposed between the flanges 5. Recesses 9 are provided at both ends of the sleeve 3, and end plates 10 made of rubber are fitted into these recesses 9 to close both ends of the sleeve 3. Each end plate 10 is provided with a cable through hole 11 at its center, and is also provided with a split surface 12 corresponding to the radius or diameter in the radial direction so as to facilitate attachment to the cable 1. The cable 1 is sealed between the joint surfaces with the end plate 10 and between the split surfaces 12 of the end plate 10 with a sealing material 13 interposed therebetween. The gripping fittings 14 are provided to grip the end of the cable 1 introduced into the sleeve 3 through the cable through hole 11 of the end plate 10, and these gripping fittings 14 are interconnected via a connecting rod 15. has been done. Although not shown, the core wires 1 of the cables 1 are connected to each other at a core wire connection portion and housed in the sleeve 3 as is well known. In the conventional example shown in FIG.
A connecting rod 15 is installed across the area.

[Problem that the idea aims to solve]

In the closure shown in FIGS. 9 to 11 described above, the gripping metal 14 is completely separated from the sleeve 3, and since there is no means to prevent the movement of the gripping metal 14, the gripping metal 14 acts on the cable 1. The axial load (tensile load, compressive load) is
When it spreads internally, the power to counter it is
Only the pressing force due to the tightening of the end plate 10 and the adhesive force of the sealing material 13 are required. Therefore, when these loads are applied to the cable 1, unreasonable force is applied to the fiber connection part including the gripping fitting 14, the sealing material 13, etc., resulting in poor airtightness of the sleeve 3 and damage to the fiber connection part (particularly the optical fiber connection part). (In the case of Furthermore, in the conventional example shown in FIG. 12, although the gripping fitting 14 is held by the end plate 10, the axial load acting on the cable 1 mentioned above spreads to the end plate 10 via the gripping fitting 14. Therefore, peeling of the sealing material 13, which is a cause of airtightness, tends to occur. In view of these technical issues, the present invention seeks to provide a closure for cable connections that can guarantee mechanical strength to withstand the loads such as tension and compression transmitted through the cable. It is something to do.

[Means to solve the problem]

In order to achieve the intended purpose of the present invention, the ends of the interconnected cables are covered by the sleeve by passing through the end plate that closes both ends of the sleeve, and the ends of the cables are covered by the sleeve. In the cable connection closure, each of the gripping metal fittings attached to the cable connector is housed in the sleeve, and each of the gripping metal fittings is non-circular, and non-circular locking recesses corresponding to these gripping metal fittings are located in the sleeve. Each of the gripping metal fittings is fitted into each of the locking recesses, and these gripping metal fittings are connected to each other via a connecting rod.

[Effect]

In the cable connection closure according to the present invention, each non-circular gripping fitting is fitted into a non-circular locking recess in the sleeve, and further,
Since these gripping metal fittings are connected to each other via the connecting rod, movement of each gripping metal fitting in the circumferential direction and the axial direction within the sleeve is restrained. Therefore, various loads acting on the cable,
For example, even if loads such as twisting, tension, and compression spread to the inside of the sleeve, these loads can be resisted in the restrained state of each of the above-mentioned gripping fittings, and as a result, the airtightness inside the sleeve may be poor, the core wire may be damaged, etc. Breakage, deterioration of communication characteristics, etc. can be avoided.

【Example】

Embodiments of the cable connection closure according to the present invention will be described with reference to the drawings. 1 to 6 show a first embodiment of a cable connection closure according to the present invention. In this embodiment, parts corresponding to those in FIGS. 9 to 11 described above are given the same reference numerals as those in FIGS. 9 to 11. In the embodiments of FIGS. 1 to 6, the sleeve 3
A locking recess 16 for the gripping fitting 14 is provided adjacent to the fitting recess 9 for each end plate 10 on the inner surface thereof. As is clear from FIGS. 3 to 5, these locking recesses 16 are formed into a non-circular concave shape with an arcuate surface 16A and tapered surfaces 16B rising from both ends thereof. and has a rising wall surface 16C adjacent to the inside of the fitting recess 9. The outer periphery of the gripping metal fitting 14 is formed into a non-circular shape with an arcuate surface 14A and a tapered surface 14B so as to correspond to the locking recess 16 and to be in close contact with the concave surface of the locking recess 16. In particular, as is clear with reference to FIG. 6, the gripping fitting 14 has a gripping hole 17 for the cable 1 at its center, and a locking protrusion 18 for the cable 1 is provided on the inner surface of the gripping hole 17. In addition, a split surface 19 is provided that crosses the gripping hole 17, and the split surface 19 can be connected with a bolt 20. A connecting rod 15 is fixed across the left and right grip fittings 14 with this dividing surface 19 as a boundary. The gripping fitting 14 is fitted into the locking recess 16. A groove 21 is formed in the inner surface of each flange 5 along its length, and a packing 8 is inserted into the groove 21.
is stored. Tightening of both flanges 5 is carried out by applying a stopper 22 to each surface and using the stopper 22. A screw hole is provided in the pad 22, and each bolt 6 is screwed into the screw hole. The supports 23 of the tension member 24 are arranged in the sleeve 3 adjacent to the inner side of each gripper 14 and perpendicular to both connecting rods 15. Both ends are supported via both connecting rods 15 passing through. As is well known, the tension members 24 of each cable 1 are held and supported by the supports 23, respectively. Inside the sleeve 3, between both supports 23,
A core wire connection portion storage chamber 25 is formed. When the core wires of each cable 1 are made of optical fibers, for example, fiber storage sheets 26 are stacked and stored in the fiber connection storage chamber 25 in which these optical fibers are to be stored. . In the case of the cable connection closure illustrated in FIGS. 1 to 6, when tensile loads, compressive loads, etc. are applied to the cable 1, these loads can be counteracted as follows. When a tensile load is applied to the cable 1, the gripping metal 14 hits the rising surface 16C of the locking recess 16 in the sleeve 3, so that movement of the gripping metal 14 along the length of the sleeve is prevented. When a compressive load is applied to the cable 1 along its length, both the gripping fittings 14 close to each locking recess 16.
is in contact with the rising surface 16C of, and
Since the connecting rod 15 is installed across both gripping metal fittings 14 in the abutting state, movement of these gripping metal fittings 14 along the length direction of the sleeve is prevented. In addition, even when a torsional load is applied to the cable 1, since the external shapes of the gripping metal fitting 14 and the locking recess 16 in the relatively fitted state are non-circular, the gripping metal fitting 14
does not rotate with respect to the sleeve 3, and therefore, not only does the sleeve 3 and the gripping fitting 14 not rotate relative to each other, but also no torsional stress is generated between the connected cables (including the core wire connection portion). As is clear from the above explanation, Figs.
In the embodiment shown in FIG. 6, the locking recess 16, the connecting rod 15, etc. provided in the sleeve 3 are
A restraint mechanism is configured to prevent movement in the axial direction and movement in the circumferential direction. 7 and 8 show a second embodiment of the cable connection closure according to the present invention. In the case of the embodiment shown in FIGS. 7 and 8, the configuration of the main parts is similar to that of the first embodiment (FIGS. 1 to 6).
The difference from the first embodiment is that a rising wall surface 16D is also formed at the inner end of the locking recess 16. In the embodiments shown in FIGS. 7 and 8 as well, it is possible to cope with loads such as tension, compression, and twisting acting on the cable, and the effect increases by adding the rising wall surface 16D. As is clear from the content of the explanation, FIG.
In the embodiment shown in FIG. 8, the locking recess 16, the connecting rod 15
These constitute a restraining mechanism for preventing movement of the gripping fitting 14 in the axial direction and the circumferential direction. The connecting rod 15 also serves as a jig for determining the distance between the two gripping metal fittings 14, as the case may be. As another example, a predetermined restraining mechanism may be configured even if both gripping metal fittings 14 are connected by a connecting rod 15 and the gripping metal fittings 14 in the connected state are brought into contact with the rising wall surface 16D of the locking recess 16. I can do it. In this case, the locking recess 16 has a rising wall surface 16C.
do not have.

[Effect of the idea]

The cable connection closure according to the present invention is
Each of the non-circular gripping metal fittings is fitted into a non-circular locking recess in the sleeve, and these gripping metal fittings are connected to each other via a connecting rod.
Since the circumferential and axial movements of each gripping metal within the sleeve are restrained through such a restraining means, each load from the cable (torsional load, tensile load, compressive load, etc.) can be resisted. Demonstrates excellent mechanical strength.

[Brief explanation of the drawing]

1 and 2 are a partially cutaway plan view and a partially cutaway side view showing a first embodiment of a cable connection closure according to the present invention, and FIG. 3 is a sleeve segment in the first embodiment. FIG. 4 is a sectional view taken along the line A-A in FIG. 3, FIG. 5 is a sectional view taken along the line B-B in FIG. 3, and FIG. 6 is a gripping diagram in the first embodiment. A front view of the metal fitting, FIGS. 7 and 8 are a right side view and a vertical cross-sectional view, FIG. 9, and FIG.
Fig. 0 and Fig. 11 are a partially cutaway plan view, right side view, and partially cutaway side view showing an example of a conventional closure for a cable connection part, and Fig. 12 is another example of a conventional closure for a cable connection part. FIG. DESCRIPTION OF SYMBOLS 1... Cable, 2... Core wire, 3... Sleeve, 10... End plate, 14... Cable gripping metal fitting, 15... Connection rod of gripping metal fitting, 16... Locking recessed part of gripping metal fitting.

Claims (1)

[Scope of utility model registration request] The ends of the mutually connected cables are covered by the sleeve by penetrating the end plates closing both ends of the sleeve, and the respective gripping fittings attached to these cable ends are housed within the sleeve. In the cable connection closure disclosed in the present invention, each of the gripping metal fittings has a non-circular shape, non-circular locking recesses corresponding to these gripping metal fittings are respectively formed in the sleeve, and the above-mentioned gripping metal fittings are formed in the sleeve. 1. A closure for a cable connection portion, characterized in that each gripping metal fitting is fitted in and these gripping metal fittings are mutually connected via a connecting rod.