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. 13, 1976
Filed:
Dec. 24, 1974
Applicant:
Inventor:
John R Plate, Milwaukee, WI (US);
Assignee:
Allis-Chalmers Corporation, Milwaukee, WI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F15B / ;
U.S. Cl.
CPC ...
13759612 ; 60486 ; 91-6 ; 91 47 ; 1375 / ; 1376253 ;
Abstract
A draft control valve for use with two constant displacement pumps in an open center hydraulic system. The valve controls the implement position in response to the draft loads and manual control and normally employs pressurized fluid from a low volume pump for operating in response to draft load sensing for control the implement position and employs pressurized fluid from the high volume pump for relatively short periods of time for positioning of the implement in response by the operator and extreme draft loads.