JPS6111880Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to attach telephone cables to the exterior wall of a building when they are brought into a subscriber's premises, thereby damaging in-home terminal equipment due to external abnormal voltages induced in the telephone cables, such as cross-contact with high-voltage lines and lightning damage. The present invention relates to the structure of a subscriber protector installed to prevent this.

Before explaining the structure of a conventional subscriber protector, the subscriber protector circuit will be described. FIG. 1 shows the subscriber protector circuit. 1 is the connection terminal for the telephone cable from the telephone office (hereinafter referred to as the outdoor line terminal), 2 is the cable connection terminal to the subscriber's premises equipment (hereinafter referred to as the indoor line terminal), and the outdoor line terminal 1 and the indoor line terminal are connected to each other. A fuse tube 4 containing a fuse is inserted in series between the indoor line terminals 2 and 2, and two lightning arresters 5 are inserted in series between the indoor line terminals 2 and 2, and the common connection point of the lightning arresters 5 is connected to the ground. Earth wire terminal 3 for connecting air wire
guided by.

The structure of a conventional subscriber protector including such a protector circuit will be explained with reference to the sectional view shown in FIG. FIG. 2a is a front view, and FIG. 2b is a side view.
1 is an outdoor line terminal, 2 is an indoor line terminal, 3 is a ground air line terminal, 4 is a fuse tube (indicated by a chain line), 5 is a lightning arrester (indicated by a chain line), 6 is one end surface molded with synthetic resin. It is a roughly square tube cover with an opening. 7
is a board on which the support piece 9 of the fuse tube 4, the holding piece 10 of the lightning arrester 5, the indoor line terminal 1, the indoor line terminal 2, and the ground air line terminal 3 are attached, and the bottom part is provided with insertion holes for the cables. . Reference numeral 8 designates a metal plate having a substantially L-shape, which has a plurality of mounting holes and is fixed to the substrate 7, and is a mounting hardware for fixing the subscriber protector to an external fixed object.

Next, the procedure for installing such a conventional subscriber protector (hereinafter referred to as a protector) using a switch box opened on the outer wall of a building is described in the third step.
This will be explained using figures. Reference numeral 11 denotes a switchbox opened in the outer wall surface 12 of the building, 13 a wooden mounting plate, for example, which is attached to the surface of the outer wall surface 12 with a plurality of screws 14, 17 a telephone cable conduit, and 18 fixed inside the switchbox. 19 is an inner beam of the building.

The outdoor wires, indoor wires, and earth air wires (hereinafter referred to as cables) that are piped between the inner and outer walls of the building and are drawn out from the end of the piping 17 into the switchbox 11 are inserted through holes provided in the mounting plate 13. After pulling it out of the building, the mounting plate 13 is fixed to the outer wall surface 12 using, for example, concrete nails 14. Next, attach the safety device mounting hardware 8 to the mounting plate 13 with the screw 1.
Screw it using 5. Then, the cables are drawn into the protector through holes provided in the bottom of the circuit board 7 of the protector, connected to their corresponding terminals, and finally the cover 6 is fitted to complete the work.

The above conventional protectors and installation procedures have the following drawbacks.

(1) The mounting plate 13 is fixed to the outer wall surface 12 using screws or concrete nails 14, but since the outer wall surface 12 is made of concrete or mortar, the mounting plate 13 is fixed to the outer wall surface 12 using screws or concrete nails 14.
3, the mounting strength is not sufficient, and there is a high possibility that cracks or peeling may occur on the surface of the outer wall surface 12. Therefore, the work requires skill and the work efficiency is low.

(2) Even if the mounting plate 13 is carefully attached to the outer wall surface, there will be a gap between the mounting plate 13 and the outer wall surface 12, and rainwater may enter the switchbox 11 through the wiring insertion hole. , which may cause problems such as poor insulation.

(3) The cables leading into the protector are exposed, which is not aesthetically pleasing.

The present invention has been made in order to solve such drawbacks, and the present invention has been made by providing screw holes in the circuit board of the protector so that the protector can be installed using the screw plate 18 having the existing screw holes in the switch box 11. The feature is that there are holes for screwing screws and holes for cables to be inserted, and packing is fixed on the back of the board.This makes it possible to insert cables without making any modifications to the exterior wall of the building. To provide a subscriber protector having a structure in which high mounting strength can be obtained while not exposing the protector and improving waterproofness between the protector and an outer wall surface. The drawings will be explained in detail below.

FIG. 4 shows an embodiment of the subscriber protector according to the present invention. FIG. 4a is a front sectional view, and FIG. 4b is a side sectional view. Note that among the symbols shown in FIG. 4, those having the same symbols as those in FIG. 2 indicate the same types.

Reference numeral 7 designates a base plate made of a plastic material and molded into an L-shape to form a vertical face plate 7' and a bottom face plate 7''. Each pair of outdoor line terminal 1, indoor line terminal 2, supporting piece 9 of the fuse tube 4, holding piece 10 of the lightning arrester 5, and earth air line terminal 3 for forming a safety circuit are formed by molding or the like. In FIG. 4a, the fuse tube 4 and the lightning arrester 5 are not shown, and in FIG. 4b, they are simply shown with chain lines.

Furthermore, the vertical face plate 7' is provided with screws 2 which are screwed into the screw holes of the screw plate 18 in the switch box 11 which is open in the outer wall surface 12 of the building, which is a feature of the present invention.
0, and has at least two screw insertion holes 21 and cable insertion holes 22 that pass through the vertical face plate 7', and a protrusion 24 is formed on the outer peripheral end face of the vertical face plate 7' excluding the face in contact with the bottom face plate 7'', Furthermore, the vertical face plate 7' is the outer wall surface 1.
A substantially square-shaped packing 23 made of rubber and having an appropriate thickness is fixed to the periphery of the surface that comes into contact with 2. Reference numeral 6 denotes a cover made of synthetic resin and in the shape of a hollow rectangular tube with an open bottom and back surface. Around the end surface of the approximately U-shaped opening on the back surface of the cover 6, there is a groove 24' into which the protrusion 24 is inserted.
(not shown) is provided.

The procedure for installing the subscriber protector of the present invention constructed in this way using the switch box 11 provided on the outer wall surface 12 will be explained with reference to FIG.
Of the symbols in FIG. 5, the same symbols as in FIG. 3 indicate the same type of thing. Reference numeral 20 denotes a screw for screwing together a screw insertion hole 21 provided in the vertical face plate 7' of the base plate 7 and a screw hole in a screw plate 18 in the switch box 11.

With the cover 6 removed, insert the cables running through the pipe 17 to the switchbox 11 into the protector through the cable insertion hole 22 of the vertical face plate 7' of the base plate 7 , and then tighten the screws 20. It is inserted into the insertion hole 21 and screwed into the screw hole of the screw plate 18. As a result, the base plate portion 7 can be firmly attached to the outer wall surface 12 due to the elasticity of the packing 23. Thereafter, cables are connected to the outdoor line terminal 1, indoor line terminal 2, and earth line terminal 3, respectively, to complete the wiring. Then, the fuse tube 4 is fitted between the two support pieces 9,
Attach the lightning arrester 5 using the holding piece 10, and finally slide it while fitting it into the concave groove 24' around the end face of the back surface of the cover 6 and the protrusion 24 around the end face of the vertical face plate 7' of the base plate 7 . Move the cover 6 to cover the board part 7 . The cover 6 and the base plate 7 are connected to the protrusion 24 and the protrusion groove 2.
The engagement of 4' protects the protector circuit element from infiltration of rainwater, etc.

In addition, the packing 24 is not square-shaped,
An insertion hole 2 is formed in an elastic flat plate having an appropriate thickness.
1 and a cable insertion hole 22 may be provided.

As explained in detail above, compared to conventional protectors, the subscriber protector of the present invention does not require any processing on the outer wall surface to which it is attached, nor does it require the use of a mounting plate for the protector. The elasticity and screw connection with the screws inside the switchbox provide a strong seal, which improves the efficiency of installation work and prevents the cables from being exposed to the outside, preventing deterioration of the insulation of the protector element and cables due to ingress of rainwater, etc. This has the advantage of preventing failures caused by

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a subscriber protector, Fig. 2 is a sectional view showing the structure of a conventional subscriber protector, and Fig. 3 is a conventional subscriber protector installed outside a switch box opened on the outer wall. FIG. 4 is a cross-sectional view showing the structure of the subscriber protector according to the present invention, and FIG. 5 is a schematic diagram showing the subscriber protector according to the present invention attached to the outside of a switch box. 1...Outdoor line terminal, 2...Indoor line terminal, 3...
Ground air line terminal, 4...Fuse pipe, 5...Surge arrester,
6...cover, 7...board, 7 ...board part, 7'
... Vertical face plate, 7'' ... Bottom plate, 8 ... Mounting hardware, 9 ... Support piece for fuse pipe 4, 10 ... Holding piece for lightning arrester 5, 11 ... Switch box, 12
...Outer wall surface, 13...Mounting plate, 14, 15...Screws, 16...Cables, 17...Piping, 18...
...screw plate, 19...inner beam, 20...screw, 21...
...Screw insertion hole, 22...Cable insertion hole, 23...
...Packing, 24...Convex strip, 24'...Concave groove.

Claims (1)

[Scope of utility model registration request] A pair of outdoor line terminals for connecting a telephone cable from a telephone office and a pair of indoor line terminals for connecting to a subscriber's terminal device are connected by fuses housed in respective fuse tubes, and the pair of indoor line terminals are connected to each other by fuses housed in respective fuse tubes. A subscriber protector housing a safety circuit formed by connecting two lightning arresters in series and connecting the common connection point of the two lightning arresters to the ground, the rectangular plate made of an insulating material. The base plate has one end bent at a substantially right angle to form a bottom plate and a vertical face plate, and the pair of outdoor line terminals, a fuse tube support piece, a lightning arrester holding piece, an indoor line terminal, and one indoor line terminal are attached to the vertical face plate of the base plate, with one end bent at a substantially right angle to form a bottom plate and a vertical face plate. a ground air line terminal, and a through hole through which the outdoor line, indoor line, and ground air line are inserted, and a screw that screws the board part into a screw hole in a switch box opened on the outer wall of the building. At least two screw insertion holes are provided for the vertical face plate, and a convex strip is formed on the outer circumferential end face of the rectangular plate end face forming the vertical face plate, excluding the face in contact with the bottom face plate, and further, the vertical face plate A board part is made of a rubber material and has a roughly square-shaped packing of an appropriate thickness arranged around the surface that comes into contact with the board, and a hollow square tube shape made of synthetic resin and has an open bottom and back part. 1. A subscriber protector for a switchbox, comprising: a cover having a groove formed around the open end surface of the back surface and which engages with a convex groove provided around the end surface of the vertical face plate of the base plate.