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:
Sep. 07, 1976
Filed:
Apr. 21, 1975
Applicant:
Inventors:
Thomas R Burnight, Battle Creek, MI (US);
Donald A Holtkamp, Battle Creek, MI (US);
Assignee:
Clark Equipment Company, Buchanan, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F01B / ;
U.S. Cl.
CPC ...
91491 ; 92 26 ; 92 30 ;
Abstract
A fixed displacement fluid motor or pump of the ball or roller piston type in which a plurality of axially or radially extending reciprocating pistons coact with a cam track to produce output motion or to generate pressure fluid output, respectively. A mechanical locking device, preferably in the form of an expansible retaining ring, is secured to each piston, being adapted to lock the piston in a fixed retracted position and out of contact with the cam in a tapered portion of the cylinder bore in modes of operation during which no motor or pump output is required.