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:
Nov. 25, 2014
Filed:
Dec. 19, 2008
Jorg Bohlen, Langen, DE;
Jorg Bohlen, Langen, DE;
Hunter Douglas Industries B.V., Rotterdam, NL;
Abstract
The invention relates to an operating unit () for architectural coverings, in particular roller blinds or shades. The unit () includes a stationary base member (), a rotatable driving member (), a rotatable driven member () and a brake mechanism (, and). The brake mechanism (, and) automatically arrests rotation of the driven member () in respect of the stationary base member (), when not rotated by the driving member (). The brake mechanism includes a first wrap spring (), adapted to yield a predetermined minimum brake force, and at least one second wrap spring (), different in size from the first wrap spring () and adapted to yield a supplementary brake force, which together with the predetermined minimum brake force amounts to a predetermined maximum brake force.