Chair control with tilt lock

Details Chair control with tilt lock Chair control with tilt lock

1976-10-07

1978-07-11

Zugel, Francis K.

Chairs and seats

Back movement resiliently opposed in operating position

Adjustable resistance

297328, A47C 3026

Patent

active

040997758

ABSTRACT:
A chair control comprising a frame structure adapted to be supported on a conventional chair base, a chair seat support pivotally mounted on the frame structure for fore and aft tilting movement relative to the frame structure, a biasing structure such as a torsion bar biasing the seat support to a position corresponding to a normal seating position of a chair seat, and rotatable blocking members mounted on the seat support for movement, in a tilted position of the seat support, to a position engaged with the frame structure so as to block return movement of the seat support to the normal position. The blocking members are operable by an actuating knob conveniently located close to the seat for operation by the seat occupant and are moveable to a plurality of positions corresponding to various tilted positions of the chair. This tilt lock structure enables the chair occupant to sit comfortably in the chair in a tilted position of the seat without having to fight the continuous tendency of the chair to return to the normal seating position.

REFERENCES:
patent: 54869 (1866-05-01), Cronk
patent: 179859 (1876-07-01), Kubitschky et al.
patent: 2424753 (1947-07-01), Herold
patent: 2829704 (1958-04-01), Hallett et al.
patent: 3480249 (1969-11-01), Lie
patent: 3784147 (1974-01-01), Harder

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