Infinitely positionable lock for reclining seat

Details Infinitely positionable lock for reclining seat Infinitely positionable lock for reclining seat

1986-04-30

1987-08-11

McCall, James T.

Chairs and seats

Movable back

Tiltable

74144, 297367, A47C 100

Patent

active

046857362

ABSTRACT:
An infinitely positionable backrest lock for a recliner seat has an upper plate hinged to a lower frame, and a gear train mounted to the lower frame and drivingly engaging the upper plate. The gear train includes a drum surface on which is wound a brake spring normally gripping the drum against rotation for locking the upper plate against pivotal movement. Positive locking of the drum and gear train is assured by an auxiliary spring and associated lever mechanism acting on the brake spring for increasing the frictional engagement between the brake spring and drum surface by more tightly winding the brake spring about the drum. Fail safe operation is assured by a bolt element spring loaded towards interlocking engagement with a toothed periphery of the drum wheel in the event of slippage between the drum surface and brake spring.

REFERENCES:
patent: 2612343 (1952-09-01), Fraizer et al.
patent: 3667804 (1972-06-01), Yasui et al.
patent: 4294488 (1981-10-01), Pickles
patent: 4337978 (1982-06-01), Kazaoka

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