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:
Oct. 06, 1992
Filed:
May. 29, 1990
Macram N Bishai, Windham, NH (US);
McCord Winn Textron Inc., Winchester, MA (US);
Abstract
A high pressure vane pump has a two-piece rotor enclosed by a housing having an inlet and an outlet and an eccentric ring for controlling the reciprocation of vanes in a guide part of the rotor; the eccentric ring is closed by opposite end plates and a moveable crown part of the rotor is supported on the guide part to provide four degrees of freedom between the guide part and the crown part including movement of the crown part axially of the guide part; movement of the crown part clockwise and counterclockwise of the guide part; and yaw movement of the crown part with respect to the vertical axis of the guide part. Rotation of the rotor causes the crown part to be shifted axially of the guide part to increase the pressure output of the pump at high speed operation and to reduce the frictional losses between the rotor and the housing during start-up.