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:
Jan. 08, 1991
Filed:
Aug. 16, 1989
Applicant:
Inventors:
Assignee:
Kubota Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A01B / ;
U.S. Cl.
CPC ...
172-2 ; 180247 ; 180338 ; 180345 ; 180900 ;
Abstract
A two-axle four-wheel tractor is equipped at its front and rear ends with working implements, individually, which are of the same type, opposite in working direction and shiftable between a working position and a nonworking position. The tractor has a steering system for steering the front and rear four wheels in the same direction through the same angle, a running transmission system for driving only the wheels positioned toward one of the working implements which is lifted to the nonworking position or, in a special case, a system for restraining the wheels positioned rearward with respect to the direction of advance of the tractor in a straight running position without permitting steering.