Safety selector switch

Details Safety selector switch Safety selector switch

1979-08-22

1981-02-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

74504, 74526, G01D 534, G05G 108

Patent

active

042503795

ABSTRACT:
A safety selector switch for preventing accidental energization of an eleical circuit. A plurality of annular discs, each having a cut-out portion in its periphery, are mounted on a shaft of an electrical component, such as a rotary switch. A second shaft is provided which is translatable in a direction parallel to the longitudinal axis of the shaft of the electrical component, and an arm is provided on said second shaft and is selectively positionable in each cut-out portion of said annular discs to limit rotation of the shaft of the electrical component. Continued rotation of the shaft of the electrical component can only be made by alternately rotating said shaft of said electrical component and translating said second shaft to move said arm to a cut-out portion of an adjacent annular disc.

REFERENCES:
patent: 2912880 (1959-11-01), Biggs et al.
patent: 3067629 (1962-12-01), Zurles
patent: 3107546 (1963-10-01), Rowland
patent: 3139769 (1964-07-01), Gauchat

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