Patent · US Active

Adjustable counterbalance system for roller doors

US8267146B2 · kind B2 · utility

1Cited by

29References

16Claims

0Family size

Assignee

Assa Abloy Entrance Systems AB · SE

Inventor

Friedhelm Frede · Erwitte, DE

Key dates

Filing date	Sep 25, 2009
Grant date	Sep 18, 2012
Priority date	—
Expiry date	Sep 9, 2030

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE06B9/62
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A counterbalance system for a rollup door system having a drum in which the counterbalance provides a counter force acting at a distance from the center of rotation of the drum. The counter force is variable in both direction and magnitude at various angular positions of the drum.

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