Electricity: circuit makers and breakers – Fluid pressure – Diaphragm
Patent
1985-12-18
1986-10-28
Tolin, G. P.
Electricity: circuit makers and breakers
Fluid pressure
Diaphragm
200 83Q, 200 83N, 2003021, H01H 3534
Patent
active
046200738
ABSTRACT:
A snap-action diaphragm having an electrically conducting central portion is electrically insulated inside a case to separate it into two parts each of which is ported to a fluid, and is biased by an electrically conducting spring towards one port which serves as an electrical contact to form a switch with the diaphragm when connected to an external circuit. The snap-action characteristic of the diaphragm between two stable states when coacting with the biasing force of the spring provides a hysteresis force that can be predetermined to avoid hunting of the switch in response to anticipated alterations in pressure difference across the diaphragm. In another embodiment, the diaphragm also acts to open or shut a valve to control fluid flow, again with the benefit of hysteresis to prevent hunting during operation.
REFERENCES:
patent: 2381582 (1945-08-01), Erickson
patent: 2704548 (1955-03-01), Ralston
patent: 4269028 (1981-05-01), Hattori
patent: 4296283 (1981-10-01), Boulanger
English translation of the Japanese-Language document: Jidosha Kagaku Binran--Automobile Engineering Handbook, vol. 3, Paragraph 2, Section 7.
Matsumoto Akio
Yokota Mitsuyoshi
Mitsubishi Denki & Kabushiki Kaisha
Tolin G. P.
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