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:
Dec. 17, 1985
Filed:
Jun. 29, 1983
Applicant:
Inventors:
Alfred Fischer, Hamburg, DE;
Claus Freimuth, Gross Hansdorf, DE;
Roland Gerlach, Hamburg, DE;
Gerhard Siefert, Reinbek, DE;
Assignee:
Claudius Peters AG, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04D / ; B65G / ;
U.S. Cl.
CPC ...
415 74 ; 366192 ; 198671 ;
Abstract
An annular nonreturn valve is provided in a pump with a screw conveyor mounted at each end. This nonreturn valve seals the outlet end of the pump. It also makes it possible for the conveyed material to be discharged without deflection in the slug area. The pivotability of the sealing element is made possible by the fact that the screw conveyor shaft has a smaller diameter in the direction of conveying behind the annular nonreturn valve. An area with enlarged diameter of the screw conveyor shaft can be provided on a casing so that wear parts can be easily replaced.