Safety switch

Details Safety switch Safety switch

1977-07-18

1978-08-15

Price, William

Electricity: circuit makers and breakers

Plural switches control single circuit

200 44, H01H 2706

Patent

active

041074840

ABSTRACT:
A safety on-off electrical switch for energizing an electrical apparatus. The safety switch is adapted to be mounted on the electrical apparatus, but may be separate therefrom. The safety switch includes a housing enclosing an on-off switch and an operating member, such as a key which is adapted for insertion into the housing to operate the on-off switch. The key has three different operative conditions relative to the housing. One is a key insertion and fully retraction position with no effect on the switch. The second is a neutral position in which the key is held in the housing, but cannot operate the switch; and the third is a switch operative position in which the key is movable from a fully inserted position to a partially retracted position to change the state of the switch from its off state to its on state.

REFERENCES:
patent: 3599047 (1971-02-01), Magarian
patent: 3629530 (1971-12-01), Fisher
patent: 3714383 (1973-01-01), Leonard et al.
patent: 3769473 (1973-10-01), Lay
patent: 3816677 (1974-06-01), Soltez

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