Safety mat switch for machine tools and their like

Details Safety mat switch for machine tools and their like Safety mat switch for machine tools and their like

1977-01-12

1978-08-08

Scott, James R.

Electrical transmission or interconnection systems

Switching systems

Plural switches

200 865, 307326, 340573, 340666, H01H 314

Patent

active

041058992

ABSTRACT:
A safety switch for machine tools and their like is formed by a mat incorporating, normally open, switching elements responsive to the weight of a person standing on the mat. The presence of a specified load, commonly of the order of 50 pounds, on the mat causes the normally open switching elements therein to close and to establish an electrical circuit. This circuit is interconnected with the machine tool by means of a flexible cable and a twist-lock connector mating with an appropriate socket on the machine. The electrical circuit is made part of the normal machine motor control circuit in such a manner that the mat has to experience the load represented by the weight of the operator to allow the machine to start and to function. Removal of such load, as, for example, by the operator walking away from the machine, opens the motor control circuit and shuts the machine down.

REFERENCES:
patent: 2644868 (1953-07-01), Locey

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