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US 4,392,357 AGranted
Method and means controlling defrost cycles of a cooling unit
AssigneeEmhart Industries, Inc.
InventorsBrian D. Kinsey, Steven W. Smock
Life of this patent
Estimating the term…
Abstract
The time between constant speed defrost cycles is shortened by monitoring the opening and closing of a door of a cooling unit. The control system for doing so includes cam means rotating at a constant speed and electrical switches responsive thereto, a ratchet with missing teeth coupled to the cam means, a pawl engaging the door and the ratchet.
Claims7
A control system for controlling defrost cycles of a cooling unit comprising:
- (a) defrost means,
- (b) cam means, constant speed drive means coupled to said cam means, and switch means responsive to said cam means controlling electrical current to said defrost means, and
- (c) monitoring means coupled to said cam means and responsive to an opening and closing of a door of said cooling unit to intermittently advance said cam means so as to shorten time lengths between defrost cycles comprising a ratchet having a section void of teeth to prevent advancement of the ratchet during a defrost mode of operation, means coupling said ratchet to said cam means, and a pawl engaging said door and said ratchet to advance same in response to an opening of said door.
Dependencies are inferred from the claim text.