Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1986-11-06
1988-06-07
Heyman, John S.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307119, 377 16, 377 42, 377 45, 331 65, 328 1, H03M 100, H03K 1100, H03K 1794
Patent
active
047498781
ABSTRACT:
A variable force push button is used as an input device for a control system. Specifically, a bi-directional storage device produces a command that is applied to an element to be controlled. A signal is generated having a characteristic representative of the force applied to the push button. A representation of the characteristic is integrated by the storage device. In addition to changing the characteristic by varying the force applied to the push button, the user can change the direction of the integration, thereby increasing and decreasing the value of the command. The push button comprises a pressure sensitive element sandwiched between electrically conductive contacts one of which is actuated by the user. The pressure sensitive element is constructed of conductive particles in an elastomeric matrix. Preferably, electrically conductive micro-agglomerates of unbound finely divided electro-conductive carbon particles having a maximum dimension of between about 0.1 and about 10 microns are enclosed by a matrix of elastomeric material and finely divided electro-conductive carbon particles bound together by the elastomeric material.
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patent: 3986003 (1976-10-01), Pruessner
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patent: 4265395 (1981-05-01), Sumikawa et al.
patent: 4387307 (1983-06-01), D'Antonio
patent: 4549098 (1985-10-01), Fushiki
Cunningham Peter T.
Michalchik Michael
Snyder Wayne E.
Advanced Micro-Matrix, Inc.
Heyman John S.
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