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:
Nov. 14, 1989
Filed:
Mar. 22, 1988
Eric Day, Longmeadow, MA (US);
Jean Paul Aubin, South Hadley, MA (US);
Jan Peyrot, Glastonbury, CT (US);
AIL Corporation, Columbia, SC (US);
Abstract
First and a second rotating members are driven in syntony with each other but at variable advance angles with respect to each other. A sensor (32) provides a position signal indicative of a predetermined rotational position of the first rotating member. A toothed wheel (40) is fixed to the second rotating member and a sensor (44) adjacent to the wheel provides a pulse indicative of each occurrence of tooth (42)/sensor (44) juxtaposition. The speed of the rotating members is determined by the pulse frequency or the time interval between the pulses. The advance angle is determined by measuring the time interval between the position signal and a particular pulse, such as the one immediately after the position signal, and multiplying the result by the determined speed.