Electricity: circuit makers and breakers – Fluid pressure – Diaphragm
Patent
1994-12-20
1996-05-21
Tolin, Gerald P.
Electricity: circuit makers and breakers
Fluid pressure
Diaphragm
73723, 200306, H01H 3534
Patent
active
055191797
ABSTRACT:
This invention provides a pressure switch and a method of manufacture thereof, which allow the air vent hole to be formed very small in diameter so that the engine oil can be reliably prevented from flowing out through this air vent hole.
The reduced diameter portion of the air vent hole 13 is formed in the following steps during the process of resin-molding the insulating cap 3 of the pressure switch 1. After the air vent hole 13 having the outwardly projecting portion 14 is formed, the recessed portion 16 of the jig 17 is placed in contact with the circumferential surface of the projecting portion 14 of the air vent hole 13. The jig 17 is pressed against the projecting portion 14 of the air vent hole 13 with a specified pressure to deform the projecting portion 14 and thereby reduce the inner diameter of the air vent hole 13 at the end.
REFERENCES:
patent: 3600535 (1971-08-01), Bergsma
patent: 4521651 (1985-06-01), Matsumoto
patent: 4524254 (1985-06-01), Yoshida
patent: 4967047 (1990-10-01), Betterton
patent: 4978821 (1990-12-01), Shon
patent: 5216213 (1993-06-01), Sato
Tolin Gerald P.
Yazaki -Corporation
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