Two-speed reducing mechanism for controlling closure devices wit

Details Two-speed reducing mechanism for controlling closure devices wit Two-speed reducing mechanism for controlling closure devices wit

1988-04-13

1989-07-18

Johnson, Blair M.

Flexible or portable closure, partition, or panel

Plural strip, slat, or panel type

Venetian blind type

74785, E06B 938

Patent

active

048484334

ABSTRACT:
A two-speed reducing mechanism for controlling the adjustment of a closure such as a blind having adjustable slats which includes a drive input shaft or wheel which is meshed with a planetary ger system supported by an output drive ring which itself is oriented within a rotatable bushing which may be selectively secured from rotation by a braking device. The planetary gear assembly is also meshed with the bushing so that when the bushing is rotatable, the closure member may be quickly adjusted in a one-to-one drive relationship with respect to the input shaft, however, when the bushing is prevented from rotating, the elements of the planetary gear assembly will rotate upon themselves causing a speed reduction.

REFERENCES:
patent: 4178814 (1979-12-01), Ahlen
patent: 4657060 (1987-04-01), Kaucic

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