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:
Jan. 26, 1988
Filed:
May. 15, 1986
William C Gunter, Tulsa, OK (US);
Ramsey Winch Company, Tulsa, OK (US);
Abstract
A control valve (10) is disclosed for use in controlling a winch motor (12) on a winch. The control valve (10) is employed with a conventional operating valve (32). When the operating valve is in the neutral position, the control valve (10) acts as a hydraulic brake and an unloading valve for a brake cylinder (20). When the operating valve (32) is moved to raise a load with the winch, the control valve provides a flow path to and from the winch motor (12) to rotate the motor to raise the load and provides sufficient hydraulic pressure in the brake cylinder chamber (18) to release the brake even if the winch has no load. When the operating valve is operated to lower the load, the control valve (10) acts as an over center valve to prevent the load and winch from running away from the winch motor (12). The control valve (10) accomplishes each of these functions with only a single valve spool (132) slidable in a valve housing (100).