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:
May. 18, 1982
Filed:
Jan. 26, 1981
John F Shumaker, Mt. Pleasant, IA (US);
J. I. Case Company, Racine, WI (US);
Abstract
A linkage system is described for increasing the moment arm of the hydraulic actuator or motor used to raise the lift arm of a material handling machine as the lift arm is rotated between its lowered and its raised position. The linkage includes a generally vertically disposed connecting link and a generally V-shaped lever arm. The connecting link translates the rotation of the lift arm into a vertical displacement. The lever arm converts the vertical displacement of the connecting link to rotate the lower end of the lift arm actuator forwardly and downwardly so that its position relative to the pivot point of the left arm increases as the lift arm is rotated to its raised position. Thus, a generally greater moment arm is produced to raise the lift arm in contradistinction to the lifting linkages of the prior art where the lifting moment arm generally decreased as the lift arm was rotated upwardly.