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:
Dec. 16, 1986
Filed:
Nov. 29, 1984
Applicant:
Inventor:
Louis-Claude Porel, Rambervillers, FR;
Assignee:
Hydro Rene Leduc, , FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04B / ; F04B / ; F04B / ;
U.S. Cl.
CPC ...
417270 ; 417510 ; 417515 ; 13762413 ;
Abstract
A hydraulic pump comprising at least a reciprocating piston, each piston being associated with one suction valve returned to its closing position by a return spring. The return spring is associated on the one hand with the valve and on the other hand with a push-piece cyclically actuated by a cam driven by the pump driving shaft in such manner that the action of the spring on the suction valve is cancelled during the suction phase and reestablished at the end of the suction phase.