Spring system for roller blinds

US11002072B2 · kind B2 · utility

Assignee

• Hunter Douglas Industries B. V. · NL

Inventors

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

Key dates

• Filing date: Nov 16, 2018
• Grant date: May 11, 2021
• Expiry date: Jun 15, 2039

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E06B9/74
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

In one aspect, a spring assist module for a covering includes a torsion spring that is selected according to a protocol such that the torsion spring drives a driven part of the covering with a constant operating force. In another aspect, a roller blind includes a roller and a torsion spring operatively coupled to the roller, with the torsion spring having a spring characteristic(s) selected according to a protocol that matches the spring characteristic(s) to a torque curve associated with the roller blind to drive the roller with a constant operating force. In a further aspect, a method for selecting a spring for use within a roller blind includes determining a parameter(s) of the roller blind, determining a torque curve for the roller blind based at least partially on the parameter(s), and selecting a spring characteristic for a torsion spring of the roller blind that matches the torque curve.