Control unit for refrigerators or freezers

Details Control unit for refrigerators or freezers Control unit for refrigerators or freezers

1983-02-02

1985-04-16

Tanner, Harry B.

Refrigeration

Automatic control

Preventing, removing or handling atmospheric condensate

62156, F25D 2106

Patent

active

045107653

ABSTRACT:
A refrigerator or freezer of the type having an electrical defrost heater associated with its evaporator has a control unit including a switch device with a first pair of contacts (16, 17) controlling the cyclic cutting-in and cutting-out of a compressor motor and a second pair of contacts (16, 18), sharing a common movable contact (16) with the first pair, controlling the periodic energization of the defrost heater. Closure of the second pair of contacts is normally obstructed by a stop member (22) which is movable by a ratchet mechanism (24, 26) or other means responsive to a predetermined number of switching cycles of the compressor motor to a defrost position in which a notch (23) in the stop member (22) permits movement of the movable contact to close the second pair of contacts (16, 18) and energize the defrost heater.

REFERENCES:
patent: 2266799 (1941-12-01), Raney
patent: 2711079 (1955-06-01), Grimshaw
patent: 3374643 (1968-03-01), Thorner
patent: 4169358 (1979-10-01), Hansen et al.

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