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:
Jun. 03, 1997
Filed:
Oct. 10, 1995
Georg Kwoka, Much, DE;
GKN Viscodrive GmbH, Lohmar, DE;
Abstract
The invention relates to a driving device for a roller shutter 1. For driving the roller shutter 1 into the open position there is provided a motor 8 with a drive 7 and a chain drive 5 which acts on the bearing shaft 3 of the roller 2 winding up the roller shutter 1. When using such shutters 1 as fire-resistant shutters 1, they must be transferable into the closed position under the influence of their dead weight, i.e. without involving any external energy. To allow the closing movement to proceed in a controlled way, the viscous coupling 10 constitutes a braking element whose housing is held non-rotatably and whose coupling hub is rotatably connected to the bearing shaft 3. The viscous coupling 10 is designed in such a way that in the rotational direction corresponding to moving the shutter into the open position, it generates practically no counter moment, whereas in the rotational movement resulting from moving the shutter 1 into the closed position, it generates a braking moment, allowing the shutter 1 to move into the closed position in a damped way. In this way it is possible to provide a simply designed driving device which is automatically adjusted to the respective direction and conditions of movement.