JPH034102Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a branch wiring device for undercarpet cables used for interconnecting telephones or microcomputer application equipment in offices and the like.

[Prior art and its problems]

In recent years, as the performance of microcomputers has improved and their prices have fallen, microcomputer-applied equipment has become widespread in offices, laboratories, factories, and other offices.

Traditionally, this type of application equipment was designed with the assumption that each device would be used independently, and its capabilities were limited by the amount of data it held.However, so-called local network systems That is, by adopting a system in which a common data bank and each device are connected to each other, effective use of data held by each device is attempted.

As a cable used to connect the microcomputer application equipment, there is a so-called under-carpet cable (hereinafter referred to as a cable) which is laid under the carpet.

Figures 1 and 2 show a conventional example of the above-mentioned cable, in which a pair of core wires 2 made of optical fibers or conductor wires are buried in the center of a belt-shaped outer sheath 1. In addition, a pair of reinforcing wires 3A and 3B made of piano wire or the like are embedded on both sides of the core wire 2.

In the above-mentioned cable, the core wire 2 is protected by supporting the reinforcing wires 3A and 3B against the compressive load that is received when the cable is laid under a carpet and is stepped on by a person.

By the way, when the above-mentioned cable is wired in a bent state as shown in FIG. 2, the difference between the bending radius R ₁ of the inner reinforcing wire 3A and the bending radius R ₂ of the outer reinforcing wire 3B causes the bending of both reinforcing wires 3A and 3B. External sheath 1
A difference arises in the amount of protrusion ₁ and ₂ from the end of the cable, which becomes an obstacle when attaching a branch wiring fitting for the core wire 2 to the end of the cable, for example.

Furthermore, in order to obtain sufficient mechanical strength, piano wire, for example, is used for the reinforcing wires 3A and 3B, and many difficulties arise in trimming the ends of such materials.

[Purpose of invention]

The present invention was developed in view of the above circumstances, and an object of the present invention is to prevent the reinforcing wires from protruding from the terminal of the outer sheath when an undercarpet cable including a plurality of reinforcing wires is wired in a bent state.

[Structure of the device and its function]

In order to achieve the above object, the present invention includes a reinforcing wire in a casing having an inlet for drawing in a belt-shaped undercarpet cable and an outlet for drawing out the core wire branched from the undercarpet cable. A restrictor is provided to restrict relative movement in the length direction.

[Example of idea]

3 to 6 show a first embodiment of the present invention, and this branch wiring fitting consists of a casing 4 made of plastic or the like and a cover 6 fixed to the casing 4 with bolts 5. The basic structure is

The casing 4 is formed with a lead-in port 7 for pulling in the outer sheath 1 of the cable, and a lead-in port 8 for drawing out the core wire 2 branched from the outer sheath 1. In addition, the casing 4 also has reinforcing wires 3A and 3B between it and the bottom of the casing 4.
A clamping plate 9 that clamps the reinforcing wire rods 3A and 3A is fixed with bolts 10.
It functions as a restrictor that restricts the relative movement of 3B in the length direction. The cable to which the branch wiring device of the present invention is applied has a structure in which reinforcing wires and core wires are embedded in a belt-shaped external sheath 1, as shown in the figure, so it can be bent along the floor surface. In this case, the outer periphery of the outer sheath 1 is stretched, and
The inner circumference tends to shrink, and depending on the rigidity of the outer sheath 1, it is difficult to bend it with an extremely small radius of curvature or over an extremely large angle. Further, when an optical fiber is used as the core wire, a minimum radius of curvature must be ensured in order not to impair the transmission characteristics of the optical fiber. Due to these factors, the branch wiring fitting of this invention,
Since this method is exclusively applied to undercarpet cables that are bent and routed with a relatively large radius of curvature, the difference in circumference between the inner and outer core wires is relatively small. In addition, tensile stress and compressive stress corresponding to the circumference difference occur in the undercarpet cable, but as mentioned above, the undercarpet cable to which the present invention is applied is laid with a relatively large radius of curvature. Therefore, the stress generated per unit length is extremely small. Therefore, the entire bent part of the undercarpet cable absorbs the strain little by little, and a large stress may be generated in some areas, or a large strain may occur in some areas (which appears as a waving phenomenon in the undercarpet cable). It is rare for the core wire to be damaged or the undercarpet cable to swell due to this occurrence.

In addition, the reference numeral 11 in the figure is a protective tube that covers the core wire 2, and this protective tube 11 holds the core wire 2 with a fibrous cushioning material 12 filled therein, and also protects the core wire 2. It has the function of alleviating applied external forces.

Next, FIG. 7 shows a second embodiment of the present invention, in which a half-split pusher 1 made of an elastic material such as rubber is sandwiched between a casing 4 and a clamping plate 9A.
3 is provided.

In the branch wiring fitting of this second embodiment, the clamping plate 9A
and pusher 13, reinforcing wire rods 3A, 3B
The pusher 13 has a function of increasing the frictional force between the clamping plate 9A and the reinforcing wires 3A and 3B. There is.

[Effect of idea]

As explained above, according to the present invention, the relative movement of the reinforcing wire can be regulated by the regulating device, so that the undercarpet cable can be bent and wired in various directions. It is possible to achieve the effect of being able to prevent the reinforcing wire from protruding from the terminal.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional example of an undercarpet cable. Figure 1 is a cross-sectional view, Figure 2 is a plan view, and Figures 3 to 6 are an embodiment of the present invention. 3 is a plan view, FIG. 4 is a view taken along the - line in FIG. 3, FIG. 5 is a view taken along the - line in FIG. 3, and FIG. 6 is a view taken along the - line in FIG. Figure 7 is a view taken along the - line of the figure, and Figure 7 is the second figure of the present invention.
FIG. 3 is a cross-sectional view showing an example. DESCRIPTION OF SYMBOLS 1... External sheath, 2... Core wire, 3A... Reinforcement wire, 3B... Reinforcement wire, 4... Casing, 6
...cover, 7...drawer port, 8...drawer port,
9...Holding plate, 9A...Holding plate, 13...Butsuyu.

Claims (1)

[Scope of utility model registration request] Branch wiring that branches the core wires from the outer sheath by being attached to an undercarpet cable in which a core wire for signal transmission and a plurality of reinforcing wires to protect the core wires are buried parallel to each other in a belt-shaped outer sheath. In the device, a casing 4 having an inlet 7 for the outer sheath 1 and an outlet 8 for the core wire 2.
A branch wiring device for an under carpet cable, characterized in that a regulating device is provided for supporting the reinforcing wires 3A and 3B and regulating their relative movement in the length direction.