JPS6334433Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a line interrupting and lightning arresting unit in a telephone subscriber protector.

In conventional protectors, when a shock wave such as a lightning surge arrives, the detonator is activated to release the water to the ground, and when a continuous wave due to high voltage contact occurs, the fuse tube is blown to cut off the line.

However, recently, thick fuse tubes occupy a lot of space inside the protector and are expensive.
In addition, fuseless protectors are being considered due to the frequent occurrence of meltdowns in mountainous areas with high levels of lightning.

The present invention was developed for use in such fuseless protectors, and provides a compact and simple line breaking and lightning arrester unit that has both shock wave and continuous wave removal functions, and has a built-in protector. An example is shown below.

In the figure, reference numeral 1 indicates a small hollow rectangular case that constitutes a line interruption/lightning arrester unit.The case 1 has a two-part structure to facilitate the installation of internal elements, which will be described later, and has a knob 2 on its top. It is provided protrudingly to facilitate installation and extraction into the protector.

A lightning arrester 3 is installed in the center of the case 1. The lightning arrester 3 has a three-pole structure, with line electrodes 3a and 3b at the openings at both ends of the insulating tube, and a grounding electrode 3c in the middle.
Equipped with. Movable metal pins 4, 5 extending along the axis of the detonator 3 are installed symmetrically on the sides of the line electrodes 3a, 3b. Between the base ends of the movable metal pins 4, 5 and the line electrodes 3a, 3b are flat plates of low melting point metals 6, 7 (metals that melt due to discharge heat), respectively.
At the same time, coiled springs 10 and 11 are inserted in a compressed state so as to wrap around the movable metal pins 4 and 5, and the elastic force of the coiled springs is applied to flanges 12 and 13 provided concentrically around the pins 4 and 5. The proximal ends of the pins are brought into pressure contact with the low melting point metals 6 and 7, and at the same time, the metals 6 and 7 are held so as to be brought into pressure contact with the electrodes 3a and 3b.

On the other hand, the tips of the movable metal pins 4 and 5 are made to protrude outside through holes 8 and 9 made in the front and rear walls of the case 1, and are connected to the inner line side terminal plates 12 and 13 and the outer line side terminal plate 1.
4 and 15, and the terminal plate 12 for the inner and outer wires is
and 14, and 13 and 15 are connected through the respective pins. Each terminal board 12, 13, 14, 15
are made of an elastic metal plate, with the base end serving as a fixed point and the free end possessing elasticity, which presses against the tips of the pins 4 and 5, respectively.

L ₁ and L ₂ indicate the external line terminals of the protector, and I ₁ and I ₂ indicate the internal line terminals of the protector.

The case 1 has a split structure as described above, preferably a split structure along the line that divides the holes 8 and 9 into two, and when the two halves of the case are combined, the lightning arrester 3, the movable pins 4 and 5, etc. , an element housing chamber 20 is formed to accommodate the springs 10 and 11 without play, and a molten metal outflow chamber 21 is formed which communicates with the chamber 20 over the side areas of the low melting point metals 6 and 7 and the detonator 3. .

Reference numeral 16 denotes a ground plate which also serves to hold the cases together. As shown in the figure, the ground plate 16 is formed of a square-shaped elastic metal plate, and its elasticity holds the side wall of the case 1, and the locking edges 16a and 16b bent at both free ends are attached to the side wall of the case 1. It engages in the locking grooves 17 and 18 formed in the holder and maintains the above-mentioned hugging state. The grooves 17 and 18 are in the case 1.
The structure is such that the ground plate 16 can be slid in from the end by opening up to the front and rear walls. Further, a grounding terminal 3d is made to protrude from the grounding electrode 3c of the lightning arrester 3, and the grounding terminal 3d is inserted into the square-shaped grounding plate 16 through the side wall of the case 1 and soldered. Earth plate 1
The case holding plate 6 has a terminal groove 19 with one end open.
is installed horizontally so that the earth terminal 3d can be inserted into the terminal groove 19 while the earth plate 16 is slid into the locking groove 17 of the case 1. The grounding plate 16 is constructed by incorporating the line interrupting and lightning arresting element according to the present invention into the main body of the protector, thereby pressing the top surface of the case with the leaf spring 23 on the main body side, and bringing the bottom plate portion into close contact with the grounding board 22 provided on the main body side. It is something.

According to the above, when a continuous wave caused by high voltage contact etc. arrives at the external line terminal _L1 or _L2 , the present invention
Outside line side terminal plate 14 or 15 - Movable pin 4 or 5 -
A discharge operation is performed via the low melting point metal 6 or 7 - the detonator 3 - the ground plate 16, and the low melting point metal 6 or 7 is discharged by the heat generated as the discharge operation continues.
As the movable pin 4 or 5 is melted, the spring 10 or 11 moves the movable pin 4 or 5 away from the outer terminal plate 14 or 15 and the inner terminal plate 12 or 13. As a result, the outside line side terminal plate 14
and the inner line side terminal board 12, between the same terminal board 15 and the same terminal board 13, and between each line terminal board and the detonator cap at a time. This allows the external line terminal
Precisely prevent persistent interference waves from flowing into the extension terminal I ₁ or I ₂ from L ₁ or L ₂ . In addition, in response to the inflow of shock waves such as lightning surges, the above-mentioned circuit operates the detonator and discharges the current, thereby achieving the purpose of protecting subscribers and telephones.

As mentioned above, the present invention eliminates the fuse tubes (two required) used in conventional telephone protectors, and combines the continuous wave removal function of the fuse tube with the shock wave removal function of a separate detonator. It can be used in combination with a single unit related to the present product, and can be suitably put into practical use as a fuseless protector. As mentioned above, the mechanism that allows both functions to be used together is extremely simple and rational.
Moreover, it is compact and unitized, so it can be handled as a single part, and it has the advantage of being easily integrated into the main body of the protector, contributing to miniaturization of the main body of the protector and cost reduction. Furthermore, since the mechanism having both of the above functions is integrated into a single unit, maintenance and inspection can be performed extremely easily, and replacement is also easy.

[Brief explanation of drawings]

Fig. 1 is an external view of a line breaking and lightning arrester unit showing an embodiment of the present invention, Fig. 2 is a front view of the same, Fig. 3 is a side view of the same, Fig. 4 is a longitudinal sectional view of the same, and Fig. 5 is the same. FIG. 3 is a cross-sectional view showing a state in which the present invention is applied to a terminal board that constitutes a railway line. 1... Insulated small case, 3... Lightning arrester, 3a,
3b...Line electrode, 3c...Grounding electrode, 3d
...Same ground terminal, 4, 5...Movable pin, 6,7
...Low melting point metal, 10,11...Spring, 1
2, 13...Inner line side terminal board, 14,15...Outer line side terminal board, 16...Earth plate.

Claims (1)

[Scope of utility model registration request] A triode detonator is housed in the center of the small case.
A pair of movable pins are housed symmetrically on the sides of the left and right line electrodes of the triode detonator, and a low melting point metal is interposed and contacted between the base end of each movable pin and each of the line electrodes, and the movable By elastically supporting the pins with springs, the low melting point metal is elastically supported between the movable pins and the lightning arrester, and the tips of the movable pins are made to protrude from the case to the outside to connect the inner line side terminal plate and the outer line side terminal plate. A security for a telephone comprising a structure in which terminal plates are interposed between terminal plates, a ground plate is attached to the outside of the small case, and a ground terminal protruding from the intermediate electrode of the lightning arrester through the case is connected to the ground plate. A line breaking and lightning protection unit for equipment.