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. 07, 1978
Filed:
Jul. 14, 1976
John W Hill, Mansfield, OH (US);
Other;
Abstract
A long horizontal tubular housing for a garage door operating screw is provided in its bottom with a slot extending lengthwise of the housing. Inside the housing there is a metal tube that is several feet long and that can be rotated by reversible means at one end of the housing. Wound helically around the tube and welded to it is a wire that forms a screw thread that is spaced from the surrounding tube and is encircled by a traveling nut for movement lengthwise of the housing when the tube is rotated. The nut is connected to means extending down through the slot for connection to a garage door to open or close the door. Since the space between the screw thread and the surrounding housing is empty except for the nut, the wire-wound portion of the tube is unsupported between the nut and the bearings for the tube. However, due to the light weight of the screw, it can be driven at least as fast as conventional door-opening screws without bending.