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. 24, 1981
Filed:
May. 08, 1979
Applicant:
Inventor:
Hugh A Griffin, Greenfield, IN (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B62D / ;
U.S. Cl.
CPC ...
180-648 ; 60484 ;
Abstract
A vehicle drive system providing abrupt turning capability under control of local or remote steering commands. The vehicle consists of a platform supported by two drive wheels and at least one castor wheel. An engine powers a hydraulic pump which drives two independently controlled hydraulic motors transmitting power to the drive wheels. Hydraulic fluid flows from the pump to the motor and is controlled through a network of valves to provide torque limiting capabilities to the drive wheels which prevents slippage with the ground. Free wheeling capability is also selectively applied during dynamic turning maneuvers to permit minimal energy changes and resulting in a short turning radius.