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:
Feb. 28, 1995
Filed:
Nov. 09, 1993
Harold E Lemont, Seymour, CT (US);
Andrew I Lemont, Derby, CT (US);
Lemont Aircraft Corporation, Ansonia, CT (US);
Abstract
Improvements to a propulsion thrust apparatus are described wherein a propeller is surrounded by a ring cage structure with which propeller tip vortices are converted to useful mass flow with a plurality of rings whose spacing from each other and the propeller are selected so that in one embodiment at least one ring is placed inside an enclosure and the others are outside. The operation of the propeller then produces an enhanced circulation of the air inside the enclosure without hot spots. In another embodiment, the rings are segmented to provide additional vortices for enhancement of the propeller mass flow. With another embodiment, at last one of the rings are provided with discontinuities on the inside edge to promote the generation of vortices that improve mixing of tip vortices and provide a noise reduction effect. In still another embodiment, the rings are helically shaped and a heater can be incorporated inside the helical ring or the entire ring is made of an appropriately helically shaped heater element. With still another embodiment, a pressure chamber is formed in front of an enclosure or duct or housing and a pair of fans with ring cage structures are placed in tandem partially inside the chamber and partially inside the duct or enclosure to provide an enhanced sealing and increased static pressure handling capability. Other embodiments are described.