Chair control

Details Chair control Chair control

1976-08-19

1977-12-27

Frazier, Roy D.

Chairs and seats

Back movement resiliently opposed in operating position

Constantly oriented during up-and-down movement

297353, 297361, 403353, A47C 300, A47C 1024

Patent

active

040651762

ABSTRACT:
A chair control mechanism for supporting both the seat and back rest of a chair, including a seat frame with a control member mounted for limited pivotal movement thereon for supporting the back rest. A torsion spring resiliently urges the control member and back rest in one direction. A back hinge is pivotally mounted on the control member and is adjustable with the aid of a threaded adjustment member and a second torsion spring to provide a positive attitute adjustment for the back rest. A back rest strap is provided carrying the back rest at its upper end and having at its lower end a T-shaped bayonet projection received in an elongated aperture in the back hinge in addition to a threaded fastener so that if for any reason the fastener fails, the back rest will not fall off.

REFERENCES:
patent: 1359145 (1920-11-01), Atwood
patent: 2271250 (1962-01-01), Buchholz
patent: 3133763 (1964-05-01), Stoll et al.
patent: 3552796 (1971-01-01), Williams
patent: 3881772 (1975-05-01), Mohrman

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