Waterproof electrical switch with safety interlock

Electricity: circuit makers and breakers – Interlocking – Between plural switches

Patent

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Details

H01H 920

Patent

active

044144407

ABSTRACT:
A water-tight housing (80) has a circuit breaker (71) mounted in its interior. A plug receiving structure (70) selectively receives an electrical plug (75). A locking pin (12) is slidably mounted through the housing to engage the electrical plug and undergo sliding movement upon receipt and withdrawal of the plug. The locking pin has a cam surface (42) for selectively camming a locking plate (10). An actuator rod (16) having a forward edge (21) is slidably received through the housing in operative connection with the circuit breaker for changing the circuit breaker between ON and OFF states. The actuator rod passes through an aperture (22) in the locking plate. The locking plate opening has a large region (23) for allowing free sliding movement of the actuating rod and a small region (24) for selectively engaging the forward edge in a locking relationship. A lost motion connection (54) includes an elongted slot (17) operatively connected with the locking pin for movement therewith and a pin (55) operatively connected with the actuator rod. The lost motion connection and the locking plate provide a dual safety interlock to block switching of the circuit breaker to its ON state in the absence of a received electrical plug.

REFERENCES:
patent: 1924691 (1933-08-01), Lofgren
patent: 1947634 (1934-02-01), Anderson
patent: 1971990 (1934-08-01), Reynolds et al.
patent: 2015543 (1935-09-01), Bissell
patent: 2420865 (1947-05-01), Conlan
patent: 3339038 (1967-08-01), Jorgensen et al.

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