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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.:

US 12253071 B1

PDFFull Text
Date of Patent:
Mar. 18, 2025

Filed:

Dec. 12, 2023

Drive system for a positive displacement pump

Applicant:

Graco Minnesota Inc., Minneapolis, MN (US);

Inventors:

Bradley H. Hines, Andover, MN (US);

Brian W. Koehn, Minneapolis, MN (US);

Jeffrey A. Earles, Lakeville, MN (US);

Paul W. Scheierl, Circle Pines, MN (US);

Adam K. Collins, Brooklyn Park, MN (US);

Assignee:

Graco Minnesota Inc., Minneapolis, MN (US);

Attorney:

Kinney & Lange, P.A.

Primary Examiner:

Charles G Freay

Int. Cl.
CPC ...
F04B 43/02 (2006.01); F04B 9/02 (2006.01); F04B 9/04 (2006.01); F04B 43/04 (2006.01); F04B 53/14 (2006.01); F04B 1/14 (2020.01); F04B 9/117 (2006.01); F04B 9/137 (2006.01); F04B 17/03 (2006.01); F04B 17/04 (2006.01); F04B 27/10 (2006.01); F04B 35/01 (2006.01); F04B 35/04 (2006.01); F04B 43/06 (2006.01); F04B 45/047 (2006.01); F04B 45/053 (2006.01); F04B 53/10 (2006.01);
U.S. Cl.
CPC ...
F04B 43/025 (2013.01); F04B 9/02 (2013.01); F04B 9/042 (2013.01); F04B 43/04 (2013.01); F04B 53/14 (2013.01); F04B 1/14 (2013.01); F04B 9/1176 (2013.01); F04B 9/1376 (2013.01); F04B 17/03 (2013.01); F04B 17/044 (2013.01); F04B 27/10 (2013.01); F04B 35/01 (2013.01); F04B 35/04 (2013.01); F04B 43/06 (2013.01); F04B 45/047 (2013.01); F04B 45/053 (2013.01); F04B 53/10 (2013.01); F04B 53/1002 (2013.01);
Abstract

A drive system for a pump includes a housing and a fluid displacer and a reciprocator configured to mechanically displace the fluid displacer through respective suction strokes. The housing and fluid displacer define an internal pressure chamber configured to be filled with a working fluid having a charge pressure. The internal pressure chamber is configured such that the working fluid exerts the charge pressure on the fluid displacer during both the suction stroke and a pressure stroke of the fluid displacer.

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