Non-deflection pressure switch apparatus

Details Non-deflection pressure switch apparatus Non-deflection pressure switch apparatus

1980-11-24

1982-07-13

Hartary, Joseph W.

Weighing scales

Illuminated

177DIG3, 200181, 307273, 310338, G01G 2318

Patent

active

043390110

ABSTRACT:
A piezoelectric element is arranged to receive a mechanical pressure signal and to generate a resultant voltage which is connected to a voltage threshold device for detecting a voltage signal above a predetermined threshold value. The threshold device comprises a two state circuit operable to change state in response to a signal above the voltage threshold. The apparatus is especially adapted to be incorporated within a platform scale for energizing a scale reading indicating system.

REFERENCES:
patent: 3076903 (1963-02-01), Schwartz
patent: 3339104 (1967-08-01), Kushner
patent: 3480801 (1969-11-01), Smith
patent: 3532993 (1970-10-01), Kennedy
patent: 3853191 (1974-12-01), Yamagiwa
patent: 3899698 (1975-08-01), Kleinschmidt
patent: 3940637 (1976-02-01), Ohigashi et al.
patent: 4158117 (1979-06-01), Quilliam et al.
patent: 4173263 (1979-11-01), Meeks

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