Counterbalance system for upward-acting door

E - Fixed Constructions – 05 – F

Patent

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Details

E05F 11/00 (2006.01) E05D 15/24 (2006.01)

Patent

CA 2334407

A counterbalance system for an upward-acting door (12) includes spaced-apart wall brackets and cable drums supported on the brackets and connected to flexible cables (38) which depend from the drums (36) and connected to the lower side edges (40, 42) of an upward-acting sectional garage door (12). One or both of the cable drums (36) may be connected to one end of a torsion coiled spring assembly (78a, 78b). Elongated spring winding and protective cover tubes (100) are sleeved over the springs (78a, 78b) and are connected to the brackets (32) by worm-gear drive winding mechanism (110), respectively, for rotating the tubes (100) to effect winding of the torsion coil springs (78a, 78b) through the hub assemblies (83) but preventing rotation of the tubes (100) during normal operation of the counterbalance system. The cable drums (36) and spring hub assemblies (83) may be supported on an elongated synchronizing shaft (34) or a torque transfer shaft extending between and supported on the wall brackets (32).

L'invention concerne un système de contrepoids pour porte à ouverture vers le haut (12). Ce système comporte des supports muraux espacés et reliés à des câbles flexibles (38) qui dépendent de tambours (36) et qui sont reliés aux extrémités inférieures (40, 42) d'une porte (12) de garage en sections à ouverture vers le haut. Au moins un des deux tambours d'enroulement (36) peut être relié à une extrémité d'un ensemble ressort hélicoïdal de torsion (78a, 78b). Un enroulement de ressort allongé ainsi que des tubes de protection (100) forment un manchon autour des ressorts (78a, 78b) et sont reliés aux supports (32) par un mécanisme d'entraînement à vis sans fin (110), de sorte qu'ils font tourner les tubes (100) et déclenchent l'enroulement des ressorts hélicoïdaux de torsion (78a, 78b) à travers les ensembles moyeu (83), tout en empêchant la rotation des tubes pendant le fonctionnement normal du système de contrepoids. Les tambours d'enroulement (36) ainsi que les ensembles moyeu (83) peuvent être disposés autour d'un arbre de synchronisation (34) ou d'un arbre de transmission de couple s'étendant entre les supports muraux (32) et soutenus par lesdits supports.

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