Metal working – Method of mechanical manufacture – Electrical device making
Patent
1989-12-20
1990-07-17
Echols, P. W.
Metal working
Method of mechanical manufacture
Electrical device making
200468, H01H 1100
Patent
active
049412540
ABSTRACT:
A method for producing a resilient element such as a thin flat plate or disc spring, commonly known as a "Belleville" spring is disclosed. The spring is capable of deflecting along an axis normal to its surface is modified in the process 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 in the process, 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 affixed to the closed end of the "U" shaped portion of the device in position to be opposite another contact carried on the switch bases. In its normal finished usage devices 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 the 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: 3822577 (1974-07-01), Roberts
patent: 4118610 (1978-10-01), Purssell et al.
patent: 4145587 (1979-03-01), Purssell
patent: 4796355 (1989-01-01), Burch et al.
patent: 4803774 (1989-02-01), Morris et al.
patent: 4815312 (1989-03-01), Jacquet et al.
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