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:
Apr. 03, 1979
Filed:
Oct. 01, 1976
William J Derner, Indianapolis, IN (US);
FMC Corporation, San Jose, CA (US);
Abstract
A geared belt provides for the positive transmission of motion between the belt and a sprocket. The belt has inwardly projecting gear teeth, with tooth faces that are contacted by sprocket teeth, and thin flexible portions bridging the space between successive gear teeth, with inwardly facing surfaces that define a dedendum line of the belt gear teeth. The belt gear teeth are substantially stiffer than the flexible portions between teeth. When the belt is in engagement with the sprocket and when transmitting motion therebetween, the belt is subjected to tension stress. The belt is also subjected to bending stresses that are induced by contact between teeth of both the belt and the sprocket upon entering or leaving meshing engagement. The belt is shaped along transverse sections, at the junctures of the tooth faces and the dedendum lines, with the neutral zones of the transverse sections being offset perpendicularly from the line of belt tension. Thus, belt tension induces flexural stresses within the transverse sections that counteract the bending stresses induced within the transverse sections by contact between the belt gear teeth and the sprocket teeth when entering or leaving meshing engagement. The belt can be formed by welding or bonding the relatively stiff teeth to a pre-shaped flexible band, or the teeth can be formed integrally with the bend by a broaching process or a molding process. The teeth can be split transversely to provide flexibility for softening tooth contacts.