Controlling defrost in a refrigerated compartment

(19)

(11)

EP 0 721 092 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	14.01.1998 Bulletin 1998/03

(43)	Date of publication A2:
	10.07.1996 Bulletin 1996/28

(21)	Application number: 95120450.2

(22)	Date of filing: 22.12.1995

(51)	International Patent Classification (IPC)⁶: F25D 21/06

(84)	Designated Contracting States:
	DE ES FR GB IT SE

(30)

Priority:

06.01.1995 US 369602

(71)	Applicant: EATON CORPORATION
	Cleveland, Ohio 44114-2584 (US)

(72)	Inventor:
	Duve, John P. Brookfield, Illinois 60513 (US)

(74)	Representative: Patentanwälte Rüger, Barthelt & Abel
	Postfach 348 73704 Esslingen a.N. 73704 Esslingen a.N. (DE)

(54)	Controlling defrost in a refrigerated compartment

(57) An electromechanical defrost control system (10) for a refrigerator which uses the compressor cycling thermostat (14) to incrementally advance a ratchet (30) each compressor cycle. The ratchet (20) drives a cam (18) which closes a defrost heater selector switch (16) when a predetermined accumulated number of compressor cycles have occurred. Upon the compartment being heated, the thermostat (14) incrementally advances the cam (18) which returns the selector switch (16) to the compressor operating position and de-energizes the defrost heater (25).

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