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:
May. 25, 1993
Filed:
Nov. 01, 1991
Richard S Herndon, Albany, OR (US);
Richard G Johnson, Milwaukie, OR (US);
Warn Industries, Inc., Milwaukie, OR (US);
Abstract
A winch having an electronic current limiter to shut off power to the drive motor when a load limit is attained. The electronic current limiter utilizes a linear hall effect transducer mounted in a torroid surrounding a conductor carrying current to the motor. The transducer outputs a voltage which is compared to a regulated preset voltage. The regulated preset voltage is preset at a value that corresponds to the voltage output of the transducer when the maximum allowed current is flowing in the current carrying conductor. The preset voltage establishes a trip point or threshold. The output voltage of the transducer and the preset voltage are compared and when the output voltage of the transducer crosses the threshold or trip point, power to the winch drive motor is shut off. The electronic current limiter includes a reset circuit that requires the motor to be driven in the reverse direction after an overload shut down before the motor may be run in the initial direction. The electronic current limiter includes a time delay circuit to permit momentary overload conditions such as caused by the required high motor starting currents.