Electricity: circuit makers and breakers – Fluid pressure – Flow-responsive type
Patent
1988-12-14
1990-01-02
Tolin, Gerald P.
Electricity: circuit makers and breakers
Fluid pressure
Flow-responsive type
200 83P, 337318, H01H 3534
Patent
active
048914797
ABSTRACT:
A resilient element such as a thin flat plate or disc spring, commonly known as a "Belleville" spring, which is capable of deflection along an axis normal to its surface is modified to include an amplifying segment disposed in a central aperture in the form of an approximately "W" shaped strip connected at its ends to opposite positions on the inner margin of the central opening. The central portion of the "W" forms an inverted "U" which is subjected, after positioning within the central aperture, to torquing stress in the plane of the material to bring the ends of the open end of the "U" slightly closer together than the inner edges of the "U" nearest its closed end. One of a pair of Switch contacts is mounted on the closed end of the "U" shaped portion of the device opposite another contact carried on the switch base. Means are provided for applying pressure, normal to the plane of the material, on some position of the peripheral sensing spring in which the ends of the "W" shaped portion connect with the inner margin of the central opening of said sensing spring and when such pressure rises to a predetermined level, the "U" shaped portion will snap over to a position in which the contact which it carries will assume an opposite portion with respect to the contact carried by the switch frame.
REFERENCES:
patent: 2200995 (1940-05-01), Procter
patent: 2824919 (1958-02-01), Davis
patent: 3472980 (1969-10-01), Davis
patent: 4820890 (1989-04-01), Tamura
The Heather Ruth Davis 1982 Trust
The Kathryn L. Acuff Trust No. 2
Tolin Gerald P.
Wagner John E.
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