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:
May. 27, 1980
Filed:
Mar. 12, 1979
William J Schlapman, Winneconne, WI (US);
J. I. Case Company, Racine, WI (US);
Abstract
A differential unit provides for relative movement between two drive wheels on a lawn sweeper or other implement powered by movement along the ground and includes a shaft and a pair of gears positioned transversely with respect to the shaft. A ratchet crown wheel is provided on one of the major faces of each gear and has camming surfaces for producing axial movement of the gears on the shaft, with each camming surface terminating in an axial surface. Axial movement is accommodated by a resilient member such as a coil spring. A roll pin projects outwardly from the shaft and engages an axial surface to drive the shaft, and is adapted to engage the camming surfaces to move the gear axially. The shaft is driven by the faster rotating gear, and difference in speeds of rotation of the gears produces a relative rotation of the shaft with respect to the slower rotating gear and produces axial movement of the slower gear with respect to the shaft.