Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1989-12-15
1992-02-18
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200 83N, 200512, 2003022, H01H 1370, H01H 900
Patent
active
050896717
ABSTRACT:
Conductive pads are disposed in a housing which consists of a degassed, non-compressible, electrically insulating fluid. One of the pads is mounted on the underside of a push-button, and the push-button is surrounded by a flexible membrane which closes one end of the housing. When the push-button is pressed, the fluid between the conductive pads is displaced, and the membrane stretches sufficiently to accommodate the displaced fluid.
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IBM Technical Disclosure Bulletin, vol. 14, No. 8, Jan. 1972; R. C. Easton, "Hydraulically Controlled Keyboard Interlock Mechanism", p. 2540.
IBM Technical Disclosure Bulletin, vol. 13, No. 3, Aug. 1970; S. D. Cook et al., "Key Matrix Using a Fluid Medium", p. 744.
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