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:
Aug. 12, 1997
Filed:
Mar. 31, 1995
Perry W Knutson, Lancaster, WI (US);
Rite-Hite Corporation, Milwaukee, WI (US);
Abstract
A tensioning assembly for use on a roller door, the roller door including a curtain windable on a roller for selectively blocking and unblocking a doorway above a floor surface, the tensioning assembly including: a drum attached to the roller for rotation therewith, a pulley disposed adjacent to the floor and also adjacent to a vertical edge of the curtain in the doorway blocking position; and a resilient member having a first end connected to the drum and a second end attached to a leading edge of the curtain, the resilient member passes around the pulley intermediate its first and second ends, and the resilient member is windable on the drum in an opposite sense to the winding of the curtain on the roller, the drum and resilient member are dimensioned relative to the roller and curtain to maintain a proportional stretch on the belt for all vertical positions of the curtain, thereby maintaining the curtain under tension at all times.