Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1980-07-29
1981-09-15
Little, Willis
Electricity: circuit makers and breakers
Liquid contact
Time delay
200 73, 200160, H01H 1352
Patent
active
042899435
ABSTRACT:
Different from conventional push-button switches with which an electric circuit is closed and opened as the button top is pushed with a finger tip and as the finger tip is withdrawn from the button top, respectively, the inventive push-button switch operates in a unique manner that the electric circuit is opened already as the pushing force by the finger tip is still on the way of increasing. The inventive push-button switches utilize the delicate snap back action taking place as the strain in the snap spring portion in the diaphragm covering of the switch exceeds a certain critical point so as to spontaneously pull apart the movable contact member on the inward surface of the covering from the fixed contact points on the base plate while the button top is still under pushing with a finger tip. The inventive push-button switch is advantageous because of the absence of the transient disturbances in the circuit such as chattering and bouncing.
REFERENCES:
patent: 3016439 (1962-01-01), Hagberg
patent: 3072769 (1963-01-01), Roeser
patent: 3932722 (1976-01-01), Obata et al.
Little Willis
Shin-Etsu Polymer Co. Ltd.
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