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:
Jan. 23, 1990
Filed:
Jan. 31, 1989
Erwin Naegele, Hessigheim, DE;
Armin Witzig, Renningen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
In known air flow rate meters, the initial tension of a spiral spring, which generates the restoring force on the baffle valve, is adjusted by the snapping of a locking spring into gaps between the teeth of a tooth ring provided on the spring housing. However, the tooth spacing cannot be made arbitrarily small. Accordingly, a way to enable finer adjustment of the initial tension is needed, so that a measurement can be made even at low idling speeds and with a small aspirated air quantity. In the air flow rate member according to the invention, the locking spring engages a detent element, which facing the toothed ring has an inside serration, the spacing of the teeth of which is less than the spacing of the toothed ring; when the spring housing rotates, detent increments that correspond to the spacing of the inside serration are attainable. Quite generally, the embodiment according to the invention enables sensitive adjustment and locking of a spiral spring serving as a restoring force.