Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1992-07-14
1995-01-10
Hoff, Marc S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 71, 361 72, 361115, H02H 700, B60L 100
Patent
active
053812956
ABSTRACT:
A battery drain limitation circuit, for use in engine-powered vehicles and equipment that rely on a battery for starting the engine and for operating accessories, disconnects the battery from all loads when the battery voltage falls to a level below which the battery charge may be insufficient to start the engine. The circuit is rendered inoperable, when the engine is running, by means of a microphone that detects engine noise. The circuit includes a reset mechanism that reconnects the battery to all loads. The reset mechanism may be automatic or manually actuated. A timing circuit delays the disconnection for a period of time sufficient to start the engine. The drain limitation circuit employs a latching relay that, in its preferred embodiment, includes front and rear coils in tandem, axially separated by a collar with an internal detent. A front plunger and a rear plunger are disposed for axial movement within the coils and the collar. The front plunger is provided with a contact actuation arm, and with latching elements that engage the detent when the plungers move in a first direction in response to the energization of the front coil, thereby latching the actuation arm in a position in which it closes the relay's contacts. The latching elements are disengaged from the detent when the plungers move in the opposite direction in response to the energization of the rear coil, allowing the actuation arm to move to a position in which it opens the contacts.
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Hewitt Richard P.
Rund Larry
Sigafoos Stuart
Datamax Electronics, Inc.
Hoff Marc S.
Jackson S.
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