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. 18, 1992
Filed:
Dec. 03, 1990
Jesse L Field, Jr, Concord, OH (US);
Caterpillar Industrial Inc., Mentor, OH (US);
Abstract
A control system for selectively moving load engaging forks along a carriage frame in first and second modes of operation is provided. In the first mode of operation the first and second forks are movable in unison and at the same rate of speed along the carriage frame and in the second mode of operation the forks are individually selectively movable. The control system includes a main control valve and first, second, and third selector valves for directing fluid flow delivered by the main control valve to first and second fluid operated jacks connected to the first and second forks, respectively, and the carriage frame. The third selector valve directs fluid flow between head ends of the jacks in the first mode of operation so that the first and second forks move in unison on the carriage frame. The control system is particularly suited for use on a material handling vehicle having a lift mast assembly.