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:
Nov. 24, 1981
Filed:
Dec. 07, 1978
R Paul Cobb, Washington, IL (US);
Marvin L Schneider, Peoria, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
The invention relates to apparatus for supplying pressurized fluid to various controlled members (16,30,34). A problem with prior apparatus is the need for a plurality of separate apparatuses to supply the controlled members. The invention solves this problem through the use of a single valve (25) that controls the supply of pressurized fluid from a fluid source to first (34), second (16) and third (30) controlled members, in which the single valve (25) has a first relief valve segment (46) to relieve the pressure of fluid flowing from the source to the first controlled member (34), a second relief valve segment (100) to relieve the pressure of fluid relieved by the first relief valve segment (46), and a third valve segment (138) to direct the fluid relieved by the first relief valve segment (46) to the second (16) and third (30) controlled members. A movable lever (26) is connected to the third valve segment (138) to shift this valve segment (138) and control the direction of the fluid. The invention is used principally in hydraulic circuits for earthworking vehicles to actuate a plurality of controlled members including a flywheel clutch and clutch brake, and steering clutches and vehicle brakes.