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:
Mar. 07, 2000
Filed:
Jan. 15, 1998
Albert Genster, Marl, DE;
Wilo GmbH, Dortmund, DE;
Abstract
The invention relates to an impeller of a rotary pump having an annular upper part defining a central inlet opening, a drive-adjacent disk-shaped lower part, and a plurality of blades secured between the upper and lower parts. The upper and lower parts are separate parts which secure together. Each blade is integrally formed with either the upper part or the lower part. Every other blade is formed with the upper part, and the remaining blades are formed with the lower part. Each blade has a free edge, remote from a base thereof, which has a projection which extends into a recess or opening formed in the part to which it is not integrally molded. After the upper and lower parts are assembled together, free spaces around the projections are filled with injected plastic, thereby securing the upper and lower parts together and securing the free ends of the blades. This structure and molding process have the advantages of permitting arbitrarily curved impeller blades and facilitating manufacture in a minimum number of operating steps.