Patent · US Active

Spring system for roller blinds

US8776861B2 · kind B2 · utility

29Cited by

19References

24Claims

0Family size

Assignee

Hunter Douglas Industries B. V. · NL

Inventors

Jorg Bohlen · Langen, DE
Lars Koop · Bremerhaven, DE

Key dates

Filing date	Feb 4, 2010
Grant date	Jul 15, 2014
Priority date	—
Expiry date	Mar 12, 2030

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE06B9/74
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A roller blind including a roller of having a roller length and a roller outer diameter, a fabric attached to said roller for winding and unwinding from said roller. The fabric has a fabric length, a fabric weight, a fabric height, and fabric thickness. The blind includes a bottom bar having a bottom bar weight, and at least one spring operatively connected to the roller to drivingly rotate the roller in at least one direction of rotation. The spring is selected according to a Protocol such that it's length ensures that it drives the roller with a constant operating force.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.