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:
May. 26, 1992
Filed:
Aug. 20, 1990
Charles B Parme, San Diego, CA (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
A sliding vane rotary pump which includes a housing having disposed therein a cylinder housing, a roller rotatable mounted in a cylindrical opening of the cylinder housing and bearing plates for closing bottom and top ends of the cylindrical opening. The roller includes a cylindrical tube having an internal space wherein each end of the cylindrical tube is provided with a counterbored surface. A seal ring is disposed within the counterbored surface of each end of the cylindrical tube a width of the seal ring extends over the internal space within the cylindrical tube. The internal space is filled with a pressurized fluid supplied by the compressor. The pressurized fluid in the internal space exerts a biasing force on the seal rings to thereby cause the seal rings to move outwardly from the ends of the roller to form a seal with the bearing plates.