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:
Apr. 01, 1997
Filed:
Jun. 28, 1995
Patrick M Lourigan, Kenosha, WI (US);
Case Corporation, Racine, WI (US);
Abstract
A hydraulic circuit has a first PV pump connected to a valve group for powering a plurality of hydraulic mechanisms connected to the group, and a second PF pump connected in the circuit. In the improvement, a hydraulic line extends between the second pump and the valve group and there is a conductor sensing a mechanism load pressure. A valve network directs flow from the second pump to the valve group when the difference between the pressure in the hydraulic line and the load pressure declines below a predetermined value. Such decline 'signals' that the mechanisms require more fluid than is available from the first pump alone. A new method for supplementing the flow of a first pump with that of a second pump is also disclosed.