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. 27, 1990
Filed:
Mar. 14, 1989
Ralph M Hoffmann, Eden Prairie, MN (US);
Compression Technologies, Inc., Eden Prairie, MN (US);
Abstract
A device and method for milling a trochoidal rotor having a predetermined trochoidal configuration. The trochoidal rotor is used in a trochoidal rotary device in which working chambers are defined between the rotor and a housing. The rotor device has inlet and outlet ports for passing a fluid or gas. The rotor is made by first planetating a rotor blank having a predetermined width and having an edge region about a predetermined axis. The cutting blade is provided which has a predetermined geometry and which is located at a predetermined fixed distance from the axis. The cutting blade is engaged with at least a portion of the edge region of the rotor blank. The cutting blade traverses the edge region of the rotor blank to cut the edge region into a predetermined trochoidal configuration. When the cutting blade is a helical flute, the engagement of the cutting blade with a portion of the edge region results in cutting at a predetermined location within the portion of the edge region. This cutting location continuously sweeps back and forth in an axial direction across the portion of the edge region as a rotor blank rotates.