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. 23, 2003
Filed:
Jul. 23, 2002
Ralf Steffens, Steinen, DE;
Other;
Abstract
The invention concerns a screw pump ( ) that is configured as a dual-shaft positive displacement motor and that comprises two positive displacement spindle rotors ( and ) rotating in opposite directions and having external toothing. In order to provide a quiet and simple drive mechanism for said rotors ( and ) while ensuring synchronization and increased rotational speed, contrate gear-like gearwheels ( and ) are mounted on both rotors ( and ) rotating in opposite directions or the rotor spindles in a corresponding plane, in which a larger contrate gear-like driving toothed wheel ( ) engages in such a way that both spindle rotors ( and ) are driven in opposite directions at an increased rotational speed, wherein said contrate gear similarity also includes a crown gear with internal and external toothing working in connection with front toothed wheels or bevel gears and the possibility that only the driving toothed wheel ( ) or only the driven gearwheels ( and ) are contrate gear-like.