Electricity: circuit makers and breakers – Weight – Treads
Patent
1984-05-25
1985-11-19
Scott, J. R.
Electricity: circuit makers and breakers
Weight
Treads
200300, H01H 302, H01H 902
Patent
active
045544247
ABSTRACT:
A normally-open pressure actuatable switchmat comprising first and second electrically conductive members separated by non-conductive material having a failsafe safety switch is provided. When the switchmat is subjected to an actuation load, there is relative movement between the first and second electrically conductive members to complete an electrically conductive path therebetween. The safety switch comprises a bridging member which includes an electrically conductive spring which is held in a compressed state by frangible restraining element such that, when the switchmat is subjected to a predetermined minimum overload, the frangible restraining element is broken allowing the spring to relax thereby completing an electrically conductive path between the conductive members. This path is maintained after removal of the overload thereby allowing the switchmat to failsafe.
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Francis Richard
Minnesota Mining and Manufacturing Co.
Scott J. R.
Sell Donald M.
Smith James A.
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