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:
Feb. 25, 1992
Filed:
Jun. 08, 1990
Paul W Mullet, Hesston, KS (US);
Elmer D Voth, Newton, KS (US);
Excel Industries, Inc., Hesston, KS (US);
Abstract
A four-wheel mobile vehicle including provision for controlling the steering position of each of the four (4) wheels so that every wheel's rolling axis will intersect at a common point around which the vehicle will turn. The control is provided by a pair of cables, one on each side of the vehicle which interconnect a pair of front and back wheels to turn each pair through similar angles in the opposite direction. The variance in angular turning between wheels on opposite sides of the vehicle is caused by wrapping the cables on each side around an identical cam pulley, one on each side, both of which are mounted on a common shaft so that their angular rotation is always identical while their winding radius is changing. The pair of cables are separately driven at different rates by a pair of double-acting hydraulic cylinders connected in parallel to a conventional power steering unit whereby the winding in and paying-out of the cable on the cam pulleys at different radiuses causes the wheels on opposite sides to turn at different rates.