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:
Mar. 23, 2021
Filed:
May. 19, 2017
Vermeer Manufacturing Company, Pella, IA (US);
Curt T. Graham, Lynnville, IA (US);
Nathan D. Dockter, Pella, IA (US);
Kent M. Recker, Pella, IA (US);
Gary J. Burns, Knoxville, IA (US);
Kent L. Thompson, Otley, IA (US);
Scott A. Rempe, Pella, IA (US);
Jeffrey T. Knapp, Pella, IA (US);
Vermeer Manufacturing Company, Pella, IA (US);
Abstract
Self-propelled vehicles that include swiveling caster wheels and independent drive wheels are disclosed. The self-propelled vehicles are selectively steered in a caster wheel steering mode or a drive wheel steering mode. The vehicle includes a differential system that may include a differential valve that allows hydraulic fluid to be transferred between the left and right drive systems. The differential system may be operable during the caster wheel steering mode such as when the vehicle is driven for transport between sites.