JPH01135902A - Skin gripping section of communication cable - Google Patents

Abstract

PURPOSE: To make an envelope gripping unit usable for various kinds of cables with different outer diameters by employing a rotabably mounted clamp to grip the envelope of the communication cable. CONSTITUTION: A screw 92 attached to a clamp 9 is screwed into a threaded hole 71 in a gripper 7 so as to mount the clamp 9 the to gripper 7. The gripper 7, which has a structure separated into an upper and a lower portions and to which the clamp 9 is mounted, is allowed to cover a cable 11 and is fastened by a bolt 8. The screw 92 of the clamp 9 is fastened with a driver at a specified torque, and a metal plate in the shape of a circular arc having protrusions 91 is embedded into the cable envelope thus fixing the envelope. Since the clamp 9 acts as the same role as a conventional inner gripper and a gripper spacer, the gripper spacer and the inner gripper needing numerous kinds of parts become unnecessary, thus reducing the cost. Further, the operation of forming the gripping unit becomes easier due to the simplification of the structure.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a cable jacket for protecting the connection part of a communication cable from external forces such as vibration, external pressure, tension, and compression that act on the connection part of the communication cable. This relates to an outer covering gripping part for fixing the.

(Prior art) In communication cables, it is necessary to fix the cable jacket in order to protect the connection part of the communication cable from the cable movement force generated by external forces such as vibration external pressure, tension, and compression that act on the connection part. There is.

For this reason, the conventional cable fixing method is to divide the cable jacket 3 into six or four parts, as shown in the cross-sectional view of the grip part of a conventional communication cable in FIG.
is peeled off from the cable core 5, and an internal gripping fitting 4 split into upper and lower halves is inserted between the cable jacket 3 and the cable core 5. Furthermore, according to the required kgS, a grip fitting spacer 2 for adjusting the outer diameter of the cable is sandwiched around the outer periphery of the cable sheath 3, and an external grip fitting 1 is tightened with a bolt from the outer periphery to grip the cable. As shown, they are integrally connected to each other by a connecting rod 6.

(Problems to be Solved by the Invention) Conventional sheath gripping portions of communication cables are applicable to a wide variety of cable connection forms and cable sheaths. There are 12 types of external gripping metal fittings, 24 types of internal gripping metal fittings, and 10 types of gripping metal fitting spacers, so each component has a large number of parts. For this reason, the individual price of each component becomes high, which is an impediment to lowering the price of cable grip component parts.Also, when forming the jacket grip, the cable jacket is divided into six equal parts or Since it is necessary to vertically divide the cable into quarters in the longitudinal direction and insert the internal gripping fitting, a large amount of space is required to form the gripping part, and the work is time-consuming. Since the cables are structured to be integrally connected to each other via a connecting rod, there is a problem in that the capacity within the connection case that protects the connection part of the communication cable cannot be used effectively.

(Problems to be Solved by the Invention) The present invention has a small number of parts and is inexpensive, the grip part is easy to form and has good workability, and the structure is simple and the grip part installation does not require much space. The objective is to provide the following.

(Means for Solving the Problems) The present invention provides an arc-shaped metal plate having a protrusion in the shape of a blind eye on the surface in contact with the cable jacket of a communication cable, and a metal plate that is not completely fixed to the metal plate. A fastener consisting of a screw mounted in a freely rotating state includes a metal fitting, a tapped hole for attaching the screw of the metal fitting, and an end face plate which is a part of protecting the connection part of the communication cable. The structure includes a gripping fitting that is divided into upper and lower halves and has a protrusion that engages with the groove of the gripper.

(Function) The sheath gripping portion of the communication cable configured as described above functions as follows.

Tightening is done by screwing the screw attached to the metal fitting into the screw hole of the gripping metal fitting, and tightening is done by attaching the metal fitting to the gripping metal fitting.

To tighten, cover the cable with a gripping bracket with a top and bottom split structure, and secure with bolts.

For tightening, tighten the screws of the metal fittings with a screwdriver or the like with a specified torque, and fix the outer sheath by making the arc-shaped metal plate with the protrusions bite into the cable outer sheath.

For tightening, the metal fittings have the same effect as conventional internal gripping metal fittings and gripping metal spacers, eliminating the need for internal gripping metal fittings and gripping metal spacers that required multiple types of parts, and because there are fewer parts compared to conventional methods. , it is possible to reduce the manufacturing cost, material management cost, and design operating cost, and since the structure is simple, the work of forming the gripping part is easy, and the work efficiency can be improved.

In addition, the gripping metal fitting eliminates the need for external gripping metal fittings, which conventionally required multiple types of parts, and has fewer parts compared to conventional gripping metal fittings, making it possible to reduce manufacturing costs, material management costs, and design operating costs. In addition, since the structure has a protrusion that engages with the groove of the end plate, which is a part of the connection part of the communication cable, it eliminates the need for a connecting rod that integrally connects the conventional gripping metal fittings. It is possible to effectively utilize the capacity within the connection case that protects the connection portion of the communication cable.

In addition, compared to conventional methods that use internal gripping metal fittings, gripping metal spacers, and external gripping metal fittings, the fastening method has a simpler structure and directly grips the cable sheath with metal fittings, so it is possible to prevent thermal expansion and contraction and creep. It is possible to secure a gripping force that can withstand cable movement forces such as

(Embodiment) FIGS. 1 to 3 are explanatory diagrams of an embodiment of a cover gripping portion of a communication cable according to the present invention.

Figures 1(a) and 1(b) are diagrams showing the configuration of the embodiment, where Figure 1(a) is a cross-sectional structural diagram, and Figure 1(b) is the same as Figure 1(a).
It is a sectional view taken along AA' of FIG.

In FIGS. 1(a) and 1(b), 9 indicates a fastening metal fitting.

For this tightening, the metal fitting 9 is made of an arc-shaped member made of stainless steel or the like that has an oval projection 91 on the surface that contacts the cable sheath, and a stainless steel member attached to the member in order to make this member bite into the cable sheath. In order to grip the cable sheath in one place, it is possible to tighten several pieces using metal fittings to prevent cable movement forces such as temperature expansion and contraction and creeping. This provides a gripping force that is sufficient to withstand. Further, 7 indicates a gripping metal fitting.

This gripping fitting 7 is a two-split member made of stainless steel or the like, and is tightened by several screw holes 71 for attaching the fitting 9 and a part for protecting the communication cable connection part. Protrusion 7 that fits into groove 101 of end plate 10
2.

Due to the configuration of this embodiment, several fasteners attach the fitting 9 to the gripping fitting 7. Next, the grip fitting 7 is placed over the cable 11 and tightened with the bolt 8. Next, tighten several screws 92 attached to the metal fitting 9 evenly with a screwdriver or the like with a specified torque, so that the arc-shaped member with the devilish protrusion 91 bites into the cable jacket. By doing so, the cable 11 can be gripped.

FIG. 2(a) is a front view of the gripping fitting 7, and FIG. 2(b) is a cross-sectional view taken along line AA'' and BB' in FIG. 2(a).

FIG. 3(a) is a front view of the metal fitting 9 for tightening, and FIG. 3(b) is a view of the metal fitting 9 for tightening.

Reference numeral 91 in FIG. 1 indicates a protrusion, and its shape is not particularly limited to this embodiment, but may be any shape that bites into the cable jacket. Note that the arc-shaped member having the eye-shaped protrusion 91 of the metal fitting 9 should be tightened by 3 to 4 mm depending on the outer diameter of the cable.
By selecting different shapes, the protrusion 91
The cable reliably bites into the cable sheath and provides a gripping force sufficient to withstand cable movement forces such as temperature expansion and contraction and creeping after cable installation.

(Effects of the Invention) As explained above, the sheath gripping portion of the communication cable of the present invention includes a clamping metal fitting for tightening and fixing the cable jacket, and a gripping metal fitting for tightening and attaching the metal fitting. The above-mentioned tightening means that the metal fitting is made of an arc-shaped metal plate having an oval-shaped protrusion, and by tightening the screw attached to the metal plate, the metal plate bites into the cable sheath and grips the cable. It has a structure.

In addition, the above-mentioned gripping fitting has a structure that engages with a groove in an end plate, which is a part to protect the connection part of the communication cable, and a cylindrical connection case that covers this end plate and the connection part of the cable. Through this, the jacket gripping portions of the cables are integrally connected.

As a result, the number of parts is significantly reduced compared to conventional cable grips, and the structure of the grip is simplified, resulting in lower manufacturing costs and improved workability for forming the grip. At the same time, the space for forming the grip portion can be minimized.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are configuration diagrams of the communication cable jacket gripping part, Figures 2 (a) and (b) are structural diagrams of the gripping fittings, and Figures 3 (a) and (b) are 4 is a schematic diagram of the structure of a metal fitting, FIG. 4 is a view of a gripping portion of a conventional communication cable, and FIG. 5 is a diagram of a configuration of a gripping portion of a conventional communication cable. 1... External gripping metal fitting 2... Gripping metal fitting spacer 3... Cable jacket 4... Internal gripping metal fitting 5.
... Cable core 6 ... Connecting rod 7 ... Gripping fitting 71 ... Screw hole 72 ... Protrusion
8... Bolt 9... Tighten with metal fittings 91
...Protrusion 92...Screw 10...End plate 101...Groove 11...Cable patent applicant Nippon Telegraph and Telephone Corporation (b) If issued

Claims (1)

[Claims] 1. A jacket gripping part for protecting the connection part of a communication cable, which includes an arc-shaped metal plate having a protrusion in the shape of a blind eye on the surface that contacts the cable jacket of the communication cable, and a metal plate that is completely attached to the metal plate. A fastening fitting consisting of a screw that is not fixed but is attached in a freely rotating state, a screw hole for attaching the screw of the fastening fitting, and a member for protecting the connection part of the communication cable. What is claimed is: 1. A covering gripping part for a communication cable, comprising a gripping metal having a top and bottom split structure and having a protrusion that engages with a groove in an end plate.