Winding mechanism

US6158563A · kind A · utility

Assignee

• Hunter Douglas International N.V.

Inventors

• Konrad Welfonder · Bremerhaven, DE
• Lars Koop · Bremerhaven, DE

Key dates

• Filing date: Jul 15, 1999
• Grant date: Dec 12, 2000
• Expiry date: Jul 15, 2019

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E06B2009/905
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A winding mechanism for an architectural covering such as a blind or shade in which a fixed shaft 10,110 is surrounded by an inner sleeve 16,116 and an outer sleeve 22,122. A one way clutch 20,32 is provided between the inner sleeve and the fixed shaft, and a cord 42,142 is wrapped around the outer surface 40,140 of the inner sleeve, and is connected at one end 44,144 to the outer sleeve 22,122 and at the other end 46,146 to drive member 12, 112 such as a bead pulley. The weight of the blind or shade tending to rotate the outer sleeve in one direction of rotation will tighten the helically wound cord 42,142 onto the outer surface 40, 140 of the inner sleeve locking it thereto and preventing, via the one way clutch 28,72, rotation of the outer sleeve until such time as the drive member 12,112 is rotated in one direction or the other to raise or lower the blind or shade.