Title: Battery charging circuit with thermostat control

Abstract: The embodiment of the battery charging circuit disclosed herein employs a relay which can be operated both mechanically and electrically. Mechanical operation is achieved by a manually operable push button which when depressed closes a relay contact in series with the relay winding. Current then flows into the winding to actuate the relay and provide a current path for the fast charge of a battery. If the battery temperature is elevated above a level considered safe for recharging, fast charging of the battery cannot occur until the battery has cooled. If the push button is depressed while the battery temperature is so elevated, it still closes the relay contact but no current flows into the winding. However, the push button is maintained in a depressed position by engagement with the relay armature. Once the battery cools, the already closed relay contact permits current to flow into the winding to actuate the relay and initiate a fast charge.

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Inventors: Elson, Donald Edwin (Timonium, MD, US)
Walter, Richard Thomas (Baltimore, MD, US)

Application Number: 510391
Filing Date: 1974-09-30
Publication_date: 1976-01-27
Assignee: The Black and Decker Manufacturing Company (Towson, MD)
Primary Class(es): 320/154
Other Classes:
US Patent Ref:

2296924	Sep, 1942	Heyer et al.	320/36.
2354877	Aug, 1944	Peters	320/35.
2369826	Feb, 1945	Heyer et al.	320/36.
2796577	Jun, 1957	Arnot	320/36.
3312889	Apr, 1967	Gold	320/54.

Other Refs:
Primary Examiner: Miller, J. D.
Assistant Examiner: Hickey, Robert J.
Attorney: Murphy; Edward D., Slotnik; Joseph R., Bloom; Leonard