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:
Dec. 23, 1986
Filed:
Jan. 31, 1985
Applicant:
Inventors:
Jan A Peeters Weem, Gresham, OR (US);
David E Krueger, Mulino, OR (US);
Dennis P Graham, Milwaukie, OR (US);
Assignee:
Hyster Company, Portland, OR (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B66C / ;
U.S. Cl.
CPC ...
294 8153 ; 294907 ;
Abstract
Twistlocks of a container spreader are operated and controlled by hydraulic cylinders and interlock valves connected in series. Interlock valves block the flow of fluid through the cylinders when insertion of the twistlocks in their mating connectors is incomplete. Parallel fluid ports at the inlet and outlet of the cylinders permit the inlet and outlet to be connected, at the ends of the hydraulic cylinder's piston stroke, to compensate for different volume requirements of the hydraulic cylinders.