Limit switch for rotary control device

Details Limit switch for rotary control device Limit switch for rotary control device

1979-11-29

1982-04-27

Little, Willis

Electricity: circuit makers and breakers

Limit switch

200153LB, H01H 316

Patent

active

043266274

ABSTRACT:
An explosion-proof limit switch having an explosion proof housing that mounts to the side of a rotary control device with actuation pins extending through annular seals to be driven by a cam on the rotary shaft of the control device. Switching units mounted inside the explosion-proof housing are mounted on a fixed pivot at a first mounting point and held resiliently at a second mounting point in a double acting adjustable spring assembly which acts both to adjusting the switching point and to absorbing excessive impact or actuating throw so as to reduce possibility of damage.

REFERENCES:
patent: 3275764 (1966-09-01), Kiessling et al.
patent: 3303299 (1967-02-01), Raymond, Jr.
patent: 3590177 (1971-06-01), Ustin
patent: 3621172 (1971-11-01), Clark
patent: 3670128 (1972-06-01), Estrem
patent: 3688593 (1972-09-01), Ustin
patent: 3739113 (1973-06-01), Gruenwald
patent: 3980852 (1976-09-01), Redfield
patent: 4171472 (1979-10-01), Elliott

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