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. 02, 1993
Filed:
Sep. 21, 1992
Roland Wanja, Hemmingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A potentiometer, which avoids problems caused when abraded material collects on the surface of the potentiometer track as a result of friction between the wiper contact and the potentiometer track, causing an undesirable increase in the contact resistance. Potentiometer track and wiper contact wear is also speeded up by this abrasion, which shortens the service life of the potentiometer. The novel potentiometer has a magnet, on a movable extension arm, that removes the abraded material from the surface of the potentiometer track in a contactless manner, thus preventing increased deposition of abraded material on the potentiometer track that would otherwise occur with increased time in operation. The novel potentiometer is especially suitable for air flow rate meters of mixture-compressing, externally ignited or air-compressing, self-igniting engines.