Electrical switch apparatus

Details Electrical switch apparatus Electrical switch apparatus

1982-05-06

1984-08-21

Scott, J. R.

Electricity: circuit makers and breakers

Fluid pressure

Flow-responsive type

200 814, 200 82C, 200835, H01H 3524

Patent

active

044671555

ABSTRACT:
Input force transmitted from a monitored process variable is applied against a displaceable double beam mechanism being opposed by a dual spring bias presettable individually to the separate set points of the switch. Comprising the double beam mechanism is an equalizer beam underlying a pair of scissor beams such that displacement force incurred by the equalizer beam is conducted through the scissor beams and supported push rods to operate the switch actuators. In a hi/lo set point embodiment two switches are separately actuated in a predetermined sequence while in a deadband embodiment a single switch is independently settable for make and break.

REFERENCES:
patent: 2536735 (1951-01-01), Gardiner et al.
patent: 2950367 (1960-08-01), McCathron
patent: 3786212 (1974-01-01), Weber
patent: 3911238 (1975-10-01), Otto et al.

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