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. 30, 1978
Filed:
Jun. 24, 1977
John S Andrepont, Lisle, IL (US);
Chicago Bridge & Iron Company, Oak Brook, IL (US);
Abstract
A hydraulic counterweight and shock-absorbing system for unbalanced loads comprises a hydraulic cylinder having a reciprocable piston attached to a rod which controls the position of the load. The hydraulic cylinder is filled with a hydraulic liquid and is provided with a valved by-pass conduit which is selectively operable to permit free movement of the piston in a 'free-wheeling' mode. An accumulator partially filled with hydraulic liquid under a high-pressure gas phase is operatively connected to the rod end of the cylinder to provide a shock-absorbing function during a 'hook-up' mode. In a 'disconnect' mode, by-pass conduits provided with a check-valve and with a relief or pressure-controlled valve permit unimpeded upward movement of the load in response to an external applied force, but prevent downward movement of the load except on application of a force exceeding the weight of the load.