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:
Oct. 23, 2012
Filed:
Dec. 29, 2009
Applicant:
Wu-teng Hsieh, Taichung, TW;
Inventor:
Wu-Teng Hsieh, Taichung, TW;
Assignee:
Hiwin Technologies Corp., Taichung, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B66B 9/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A double screw elevator consists of two screws whose helical threads extend in opposite helical directions, and each of the screws is provided with a nut, so that a suspension unit and a carrying unit on the nuts can be driven to move close to or away from each other, thus achieving the function of lifting or lowering the elevator car. The double screw elevator is simply structured, easy to assemble, and the length of a single screw of the elevator is shortened, making it easier to manufacture the screw. Furthermore, the screw driving elevator reduces the occurrence of accident whiling improving the rate of utilization.