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:
Dec. 03, 1991
Filed:
Mar. 22, 1990
Lawrence H Zuckerman, Easton, PA (US);
Masco Industries, Inc., Taylor, MI (US);
Abstract
An obstruction detecting reversing apparatus is disclosed for a motor driven device, such as a powered vehicle door or window system, wherein the device undergoes varying loads, and consequently varying current draws, during normal operation. In order to accurately detect the presence of an obstruction, in light of such normally varying currents, the apparatus circuit logic monitors instantaneous motor current and compares it with the time average of motor current over a very short preceding time interval, which 'tracks' normal current draw in order to sense an obstruction-caused rise in motor current at virtually any stage of the door closing operation, and thus also accommodates normal changes in current draw caused by different gravity effects when the device is oriented in different grade-caused orientations.