Chair control for a pedestal chair having a knee-tilt seat

Details Chair control for a pedestal chair having a knee-tilt seat Chair control for a pedestal chair having a knee-tilt seat

1989-03-20

1990-03-06

Zugel, Francis K.

Chairs and seats

Back movement resiliently opposed in operating position

Back and seat adjust simultaneously

297304, 248609, A47C 300

Patent

active

049060457

ABSTRACT:
A chair control for a pedestal chair having a knee-tilt seat. An elastomeric torsion spring is offset rearwardly from the tilting axis of the seat. The seat and torsion spring are operatively connected by a cam surface and a cam follower which effectively reduce the restoring force exerted by the torsion spring against the seat as the rearward tilt of the seat increases. A mechanism to adjust the initial restoring torque of the torsion spring provides a large angular twist of the torsion spring with a minimum linear movement of the mechanism. The chair control provides the chair seat with a less than conventional seat angle relative to the horizontal when the chair is unoccupied. A mechanism is provided to enable the occupant to adjust the chair seat to a more conventional seat angle in its unoccupied condition.

REFERENCES:
patent: 2056965 (1936-10-01), Herold
patent: 2087253 (1937-07-01), Herold
patent: 2800948 (1957-07-01), Omon et al.
patent: 2889868 (1959-06-01), Seenberg
patent: 3345106 (1967-10-01), Tschursch et al.
patent: 3662983 (1972-05-01), Wolters
patent: 3823932 (1974-07-01), Simons
patent: 4666121 (1987-05-01), Choong et al.
patent: 4718726 (1988-01-01), Estkowski et al.

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