JPH019181Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device that utilizes deformation of a case to activate a weak point.

A conventional safety device using a security board in which a mechanical weak point is provided in the middle part of an insulating board is, as shown in FIGS. A mechanical weak point 2 is provided by notching or drilling, etc., and a mounting bracket 4 is riveted 5 at both ends of a security board 6 which has a conductive part 3 formed on the upper surface of the insulating board 1 including the weak point 2. As shown in FIG. 2, a mounting bracket 4 is attached to the inner wall surface of the case 7 by welding or soldering, and the security board 6 is stretched inside the case. In this security device, as shown in FIG. 3, when the case 7 swells due to the generation of gas due to the destruction of the internal element 8 housed in the case 7, the security board 6 is cut at the weak point 2, and the conductor 10 The electrical connection between the internal element 8 and the external terminal 9 via the conductive portion 3 is cut off.

However, in the above-mentioned conventional safety device, there is no margin for pressure, and the deformation of the case due to changes in internal pressure directly leads to the operation of the safety board, causing external force P to be applied to the case 7 as shown in FIG. There is a drawback that the safety device is activated even if the internal pressure becomes negative or if the internal pressure increases during the manufacturing process.

The present invention solves these conventional drawbacks, and embodiments of the present invention will be described below with reference to the drawings.

5 to 7 show an embodiment of the present invention.
As shown in these figures, on both ends of the security board 6,
A fitting 11 having a hook 11a is fixed, and an engagement fitting 12 provided with an engagement hole 12a into which the hook 11a of the fitting 11 is inserted and engaged is attached to the case 7.
The safety board 6 is attached to a pair of inner wall surfaces of the case 7, and the security board 6 is stretched between the inner wall surfaces of the case 7 as shown in FIG.

According to the security device of the present invention constructed in this way, when the pressure inside the case 7 increases and the case bulges and an outward force is applied to the security board 6 as shown in FIG. The security board 6 is cut at the weak point 2 as in the conventional example, but if an external force is applied to the case 7 or the inside of the case becomes negative pressure, it will break in the engagement hole 12a of the engagement fitting 12. The movement of the fixture 11 absorbs the deformation of the case, and no external force or inward force is applied to the security board 6, so that the security board 6 is not cut at the weak point 2.

In the above-mentioned embodiment, the fixture 11 is attached to the security board 6 and the engaging fitting 12 is attached to the inner wall surface of the case 7, but conversely, as shown in FIG. 11 is attached to the inner wall surface of the case 7, and an engagement hole 1 is inserted into the hook portion 11a.
The same effect as in the above embodiment can also be obtained by attaching the engaging metal fitting 12 provided with 2a to the security board 6 and suspending the security board 6 in the case using the mounting fitting 11 and the engaging metal fitting 12. can.

Further, the shapes of the fitting 11 and the engaging fitting 12 are as follows.
As shown in the figure, a plurality of hooks 11 are attached to the fixture 11.
a, and the plurality of hook parts 11 are provided on the engaging metal fitting 12.
A plurality of engagement holes 12a may be provided corresponding to the engagement holes 12a, or, as shown in FIG. good.

As described above, according to the present invention, the pressure inside the case increases due to the gas generated by the destruction of internal elements, and the operation can be performed only when the case swells, increasing the reliability of the operation of the safety device. be able to.

[Brief explanation of the drawing]

Fig. 1 is a top view a and a side view b of a security board used in a conventional security device, Fig. 2 is a side view showing the mounting structure of a conventional security board, and Fig. 3 is an explanatory diagram of the operation of the security device. Fig. 4 is an explanatory diagram of the operation when an external force is applied, Fig. 5 is a side view of the mounting of the present invention attached to the security board, and Fig. 6 is a perspective view of the mounting of the invention and the engaging fitting. Perspective view b and FIG. 7 are side sectional views of one embodiment of the safety device of the present invention, FIG. 8 is a side view of main parts of another embodiment of the present invention, and FIGS. 9 and 10 are respectively shown in the present invention. FIG. 7 is a perspective view of a fitting and an engagement fitting according to another embodiment of the invention; DESCRIPTION OF SYMBOLS 1... Insulating board, 2... Weak point, 3... Conductive part, 4... Mounting bracket, 5... Rivet, 6... Security board, 7... Case, 8... Internal element, 9...
External terminal, 10...Conductor, 11...Mounting tool, 11
a... Hook portion, 12... Engagement metal fitting, 12a... Engagement hole.

Claims (1)

[Scope of utility model registration request] A weak point is provided in the middle of the insulating substrate, and a security board with a conductive part formed on the insulating substrate including the weak point is stretched between the inner walls of the case, and as the case deforms, the security board In a security device configured to be cut at a weak point, a fixture having a hook is fixed to both ends of the security board and one of a pair of inner wall surfaces of the case, and the other is engaged with the hook. A security device characterized in that a security board is attached to an inner wall surface of a case by fixing an engaging metal fitting having a hole and engaging the fitting with the engaging metal fitting.