Electricity: circuit makers and breakers – Solid contact – Compressible elastomer
Patent
1989-12-04
1991-06-11
Luebke, Renee S.
Electricity: circuit makers and breakers
Solid contact
Compressible elastomer
49 26, 187DIG1, 200 6143, H01H 106
Patent
active
050234188
ABSTRACT:
A safety edge switch for power-actuated devices such as roller gates, roller grilles, etc., and lifting platforms, working platforms and the like, as well as for the guarding of machines or spaces, for example as safety flooring, with a hollow rubber profile (1) within which there is a knife-edge rib (5), the surface of the rib and the opposing surface of the hollow rubber profile being made electrically conductive and the mutual contact of the surfaces leading to a switching pulse. The requisite conductivity of the hollow rubber profile is achieved by virtue of the fact that the rib (5) and the main part of the hollow rubber profile (1) are made wholly electrically conductive, the conductivity arising through the admixture of conductive substances such as carbon black, graphite, metal powder and the like. The rib and the main part of the hollow rubber profile are insulated from each other by virtue of the fact that ordinary nonconductive rubber is present between these parts. The conductivity in the rib of the main part of the hollow rubber profile (1) can be enhanced by means of electrically conductive wires ( 6) of metal, carbon fibers or graphite fibers and the like.
Luebke Renee S.
Schwab Charles L.
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