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:
Apr. 12, 1977
Filed:
May. 19, 1975
Bobbylee Pease, Battle Creek, MI (US);
Clark C Simpson, Martin, MI (US);
Clark Equipment Company, Buchanan, MI (US);
Abstract
A hydraulic cylinder assembly in which cylinders are separated into two coaxial cylindrical portions sealed hydraulically one from the other, one having an extensible piston therein and the other being extensible together with the extensible piston on a fixed supporting piston. In an exemplary embodiment two such cylinder assemblies are mounted to operate in opposite directions within various predetermined fixed limits of extension to control the extension of a telescopic spreader frame for handling containers to selected ones of such fixed limits. For different combinations of such fixed limits of extension in one or more selected installations, different length spacers are used at the time of assembly in the cylinder assemblies to establish various fixed and predetermined intermediate extensions between full extension and full retraction thereof. A hydraulic control system for the cylinder assemblies includes first and second valves and conduits variously connecting the valves to both cylinder portions of both cylinder assemblies.