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:
Oct. 04, 1983
Filed:
Jan. 29, 1981
Gary R Fichtinger, Hazel Green, WI (US);
Deere & Company, Moline, IL (US);
Abstract
A winch control valve is provided for controlling the flow of fluid to and from a clutch and a brake of a winch transmission which are operable for establishing a hold condition in the winch when no fluid pressure is connected to the clutch and brake, a free spool condition wherein pressure fluid is connected to only the brake, and a wind-in condition wherein fluid pressure is connected to both the clutch and the brake. In addition, the valve spool is provided with lands which are dimensioned slightly smaller than service ports leading to the clutch and brake of the winch so that pressure fluid may selectively be routed to the service ports and at the same time, be metered to sump whereby a partial clutch engagement pressure may be effected in the clutch to thereby establish an inching condition and whereby partial pressure may be established in the brake passage for effecting a partial release thereof so as to establish a controlled release condition in the winch. Also provided is a pin-operated inlet check ball for connecting pressurized fluid to the control valve when needed. The pin is, in turn, operated through means of a cam on the winch control valve spool such that the check ball is unseated by rolling it off a fluid pressure outlet leading from a valve housing to which a source of fluid pressure is connected.