The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 2001
Filed:
May. 25, 2000
Matthew M. Crass, Pleasant Prairie, WI (US);
Snap-on Technologies, Inc., Lincolnshire, IL (US);
Abstract
A battery pack has a pair of input/output terminals adapted to be connected across a source of charging voltage, and a lead-acid battery connected across the input/output terminals. A Zener diode is connected in series with a resistance across the input/output terminals, the resistance forming part of a trigger circuit for triggering an alarm signal to actuate a visible and/or audible annunciator when the charging voltage exceeds a threshold level. In one embodiment the trigger circuit is an IC comparator having one input connected to a reference voltage drive from a voltage divider connected across the input/output terminals, and the other input connected to the trigger voltage across the resistance in series with the Zener. In another embodiment the trigger circuit includes a pair of transistors, one being turned ON by the trigger voltage and in turn ON the second transistor to produce the output signal and provide a feedback to latch on the first transistor.