Spring balancer for a roll-up door

Details Spring balancer for a roll-up door Spring balancer for a roll-up door

1992-01-30

1993-04-13

Oberleitner, Robert J.

Spring devices

Torsion

Coil

267168, 16198, F16F 110

Patent

active

052018970

ABSTRACT:
An improved spring balancer (10) includes a shaft (13) rotatably mounted on a support (11). A first torsional spring (14) acts between the support and the shaft. A second torsional spring (19) acts between the support and a cable drum assembly (63) journalled on the shaft. A third spring (23) acts between the support and another cable drum assembly (26). A fourth cable drum (28) is fixed to the shaft. Four cables (141,142,143,144) are associated with the various cable drums (140,63,26,28) and are connected to a roll-up door (12). When the door is lowered, the various springs will absorb energy. When the door is raised, the various springs will give up energy.

REFERENCES:
patent: 2660753 (1953-12-01), Moler
patent: 2749570 (1956-06-01), Alder
patent: 2786712 (1957-03-01), Whiting

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