Braking device for elevation gimbals

Details Braking device for elevation gimbals Braking device for elevation gimbals

1995-11-07

1998-03-17

Poon, Peter M.

Brakes

Miscellaneous

74 8914, 160300, F16F 900, E06B 956

Patent

active

057276641

ABSTRACT:
A locking device for a roller blind gimbal includes a drive worm gear meshed with a crown gear to which a roller blind is coupled, and a pair of pinion gears meshed to the crown gear for co-rotation therewith, the pinion gears having locking openings in their hubs engageable by a locking element that is spring biased towards the locking openings when they are aligned in a locking position. The locking position of the openings is periodically reached by rotation of the crown gear and pinion gears in a blind raising direction. Release of the locking element is obtained by rotating a driving worm gear in a blind lowering direction to release the engagement between the locking element and the hub openings in the pinion gears. When the locking openings in the pinion gears re-align at the predetermined blind raised position, the spring biases the locking element into engagement with the openings to lock the pinion gears against co-rotation and setting the locking element into position relative to the worm gear to prevent reverse rotation of the crown gear.

REFERENCES:
patent: 1420151 (1922-06-01), Sauvage
patent: 1472382 (1923-11-01), Bayles et al.
patent: 3398590 (1968-08-01), Campbell et al.
patent: 5570606 (1996-11-01), Irie

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