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. 10, 1990
Filed:
Oct. 24, 1988
William B McCall, Novato, CA (US);
Other;
Abstract
A pure rotary positive displacement device includes a rotatably mounted circular cylindrical housing having an even number of equiangularly spaced, radial cylinders formed therein. A rotatably mounted piston carrier rotates in synchronization with the cylinder housing and supports at least one piston for movement within the cylinders. The central axis of the piston carrier is offset from the central axis of the cylinder housing, and each piston is spaced from the central axis of the piston carrier by the offset between the rotational axes of the piston carrier and the cylinder housing. The pistons and cylinders preferably have congruent conjugate surfaces to reduce leakage between the pistons and the cylinders, and the pistons are rotatably mounted to the piston carrier. The number of pistons is typically one-half the number of cylinders, and if multiple pistons are used, then they are spaced equiangularly about the piston carrier. When the device is designed to function as a pump or as a compressor, a fluid to be pumped or compressed is admitted to the cylinder housing and is forced from each cylinder as a piston advances toward the distal end thereof. A stationary cylinder head forms a sliding seal with the arcuate peripheral surface of the cylinder housing to exhaust fluid pumped, expanded or compressed by the pistons.