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. 09, 1982
Filed:
Mar. 13, 1980
Applicant:
Inventor:
Jerry A Waite, Racine, WI (US);
Assignee:
J. I. Case Company, Racine, WI (US);
Primary Examiner:
Int. Cl.
CPC ...
E02F / ;
U.S. Cl.
CPC ...
414707 ; 414714 ; 414728 ;
Abstract
A mechanical linkage and hydraulic circuit are used to control the position of a material handling element. A bell crank and outrigger arm are joined between the boom and dipperstick of a backhoe linkage and the supporting frame. A relief valve discharges fluid pressure building up in the actuator between the support frame and the boom. The bell crank linkage and hydraulic circuit maintains the position of the material handling element along the grade by manipulating the dipperstick alone.