Torque control mechanism for chairs

Details Torque control mechanism for chairs Torque control mechanism for chairs

1993-09-23

1995-02-14

Brown, Peter R.

Chairs and seats

Back movement resiliently opposed in operating position

Back and bottom adjust in a fixed relationship

297304, A47C 3026

Patent

active

053888898

ABSTRACT:
Disclosed is a knee tilt control mechanism for a pedestal type of chair. The control mechanism has a main torsion spring member secured to the control housing designed to resist pivotal movement of the chair seat about a pivot point on the housing. The chair control mechanism includes one or more lever arms attached at one end to the pivot point pins and attached at the other end to a link member. The link member has a pin adapted to slide within a retaining groove or slot in the chair control housing and is connected to the chair pivot point with a tension spring. The lever arm, link and tension spring supply a restoring force which when coupled to the torque force produced by the main spring, results in a restoring force that is nonlinear and is comfortable to the user for all positions of the chair.

REFERENCES:
patent: 2859799 (1958-11-01), Moore
patent: 4796950 (1989-01-01), Mrotz et al.
patent: 4818019 (1989-01-01), Mrotz
patent: 4858993 (1989-01-01), Steinmann
patent: 4892354 (1990-01-01), Estkowski et al.
patent: 4962962 (1990-10-01), Machate et al.
patent: 4966411 (1990-01-01), Katagiri et al.
patent: 5029940 (1991-01-01), Golynsky et al.

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