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. 01, 2005
Filed:
May. 17, 2001
Lutz Axel May, Gelting, DE;
Lutz Axel May, Gelting, DE;
Abas, Incorporated, Chicago, IL (US);
Abstract
Torque is measured in the chain wheel () of a pedal cycle by a non-contacting magnetic-based transducer. A magnetising source (), a D.C. type of source such as a permanent magnet is positioned adjacent the chain wheel () to induce an arcuate magnetised zone () in the wheel () as it rotates. The zone emanates a torque-dependent magnetic-field component that is detectable by a sensor () that follows the source () in the direction of rotation. By having the magnetising source () continually in position the arcuate tranducer zone () is refreshed on each rotation of the chain wheel. The nature of the pulsating torque in the chain wheel due to the exertion of the rider and its relationship to the angle of the pedal cranks is discussed with a preference for positioning the source () and sensor () at positions of minimum and maximum exerted torque respectively. If the induced arcuate magnetisation is interrupted () pulses for measuring rotational speed are obtainable. The torque measurement is of general application to torque in sprocket wheels or gear wheels.