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. 19, 1993
Filed:
May. 12, 1992
Milton Roy Company, Arvada, CO (US);
Abstract
An impeller-type pump system includes a housing defining a pump chamber and a fluid inlet communicating with the chamber. An impeller is rotatably mounted in the pump chamber downstream of the inlet. The impeller includes a rear magnet hub mounting an axially facing driven magnetic coupling. Bearings are provided about the outside of the impeller for rotatably mounting the impeller in the pump chamber. Ceramic barrier discs are located behind the impeller to define a closure sealing the rear of the pump chamber. Ball bearings are mounted in a cup-shaped recess in the rear face of the magnet hub and bearing against the ceramic barrier discs at least during start-up of the pump. The sidewalls of the recess diverge away from the ceramic barrier discs, whereby the ball bearings move away from the ceramic barrier discs under centrifugal force in response to rotation of the impeller.