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Synchronous load lock-out control system for battery powered equipment

  • US 4,724,332 A
  • Filed: 06/12/1985
  • Issued: 02/09/1988
  • Est. Priority Date: 06/12/1985
  • Status: Expired due to Term
First Claim
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1. A load lock-out control for intermittently energized battery powered equipment comprising means for monitoring the state of charge of the battery, said monitoring means being operable to produce a signal change when there is a change in the battery charge from an acceptable charge to a substantially reduced charge, a controller for controlling a current to the battery powered equipment, a control circuit for said controller, a lock-out relay connected in said control circuit for controlling said controller, said lock-out relay being connected to respond to the signal change from acceptable battery charge to reduced battery charge from said monitoring means to open said control circuit, a current-detecting means connected to detect the presence of current in said control circuit for controlling said controller, said current-detecting means being connected to said lock-out relay and being operable to hold off the lock-out operation of said lock-out relay while current above a first predetermined value is flowing in said control circuit so that the lock out operation of said lock-out relay will occur only during a condition in which the control circuit current is below said first predetermined value.

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