Mechanism for controlling the raising and lowering of a door

Details Mechanism for controlling the raising and lowering of a door Mechanism for controlling the raising and lowering of a door

1992-03-30

1993-04-20

Purol, David M.

Flexible or portable closure, partition, or panel

Automatic control

With starting or driving means

160133, 160310, E05F 1520

Patent

active

052033929

ABSTRACT:
A mechanism for controlling the raising and lowering of a door comprises a speed reduction gearing, a high speed input shaft and a low speed output shaft connected to the gearing, a governor mounted on the input shaft for regulating the input shaft's rotational speed whereby also regulating the output shaft's rotational speed, a first mechanism for operatively connecting the input shaft to a second mechanism for rotating the input shaft, a mechanism for operatively connecting the output shaft to a slatted retractable door, a brake for preventing rotation of the output shaft, and a release-mechanism the brake to permit rotation of the output shaft.

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