Spring adjustment device for overhead doors

Details Spring adjustment device for overhead doors Spring adjustment device for overhead doors

1989-04-11

1991-01-01

Ramirez, Ramon O.

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

With mounting or supporting means

E05F 1100

Patent

active

049811657

ABSTRACT:
An overhead door mechanism with torsion type counterbalance springs includes a spring adjustment device comprising a housing suitable for attachment to a horizontal shaft and a gearing mechanism that allows angular adjustment of the attached end of the spring relative to the shaft. The gearing mechanism includes a toothed ring gear member adapted for connection to the spring and rotatably mounted in the housing. A threaded worm is also mounted in the housing so that it engages the teeth of the toothed member. Rotation of the threaded worm induces a corresponding rotation of the toothed member. The rotation, when conveyed to one end of a spring that is fixed at its other end causes the spring torsion to be altered without releasing the spring from retention by the adjustment mechanism.

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