Chairs and seats – Back movement resiliently opposed in operating position – Back and bottom adjust in a fixed relationship
Utility Patent
2000-03-15
2001-01-02
Brown, Peter R. (Department: 3636)
Chairs and seats
Back movement resiliently opposed in operating position
Back and bottom adjust in a fixed relationship
C297S303300, C297S326000, C297S302500
Utility Patent
active
06168233
ABSTRACT:
DESCRIPTION OF THE PRIOR ART
Chairs of the abstract description are unknown, but torsion bar chair controls for office-type chairs are common. When utilizing a torsion bar in an office-type chair, the elongated axis of the bar is usually located above the chair post, within a mechanism that also contains the seat rotation stops and the seat initial resiliency controls. Typical office chairs having a torsion bar mechanism are described in U.S. Pat. Nos. 3,136,580; 3,240,528 and 3,224,807. The only four legged chair known to the applicant that has a torsion bar, is disclosed in U.S. Pat. No. 4,938,532. In this chair the torsion bar, its bearings and a non-adjustable seat stop are mounted on an aluminum extrusion bar that is welded to the chair frame. Here the torsion bar is used to provide a flexible back support, only.
BACKGROUND OF THE INVENTION
The present invention relates to four legged and sled chairs of the type used in conference halls and restaurants. Said chairs always have a fixed seat; usually they don't have arm rests and are of a stackable type.
In this invention, the seat is supported and guided by a transverse torsion bar(s) so as to enable it to pivot, tilt or recline with respect to the chair frame, thereby enabling the user to rotate the seat position from upright (maximum forward) seating to a fully reclining (maximum rearward) seating, and vice versa. Thus, giving a pleasing sense of freedom and comfort to the occupant. The torsion bar(s), anchored to the chair frame and to the bottom seat board, provides the resilient torque that bias the seat to its upright position. Means attached to said bottom seat board engage travel limiting means placed in the side frame that would define the maximum forward and rearward rotation of said seat.
In the present state-of-the-art, only chairs having a vertical post with the ubiquitous spider base offers reclinable seating, all others have fixed seating —or at most— a tiltable back board. But those spider based chairs —though very comfortable— are too unsightly, expensive and/or cumbersome to move and to store-away, to be used in high density seating areas like restaurants, bingo parlors, auditoriums, etc.
In view of the shortcomings mentioned above, it is the principal object of the present invention to introduce a chair having a reclinable seat mounted on a four legged frame, or a sled frame, whereby said frame could be made of plastic, metal and/or wood. Yet, another object of the invention is to provide an inexpensive reclinable chair having enhanced aesthetics and comfort. A further object of the invention is to provide a simplified method of manufacturing and assembling such chairs.
REFERENCES:
patent: 2633897 (1953-04-01), Moore
patent: 2935119 (1960-05-01), Lie
patent: 3185429 (1965-05-01), Meinhardt
patent: 3989297 (1976-11-01), Kerstholt
patent: 4718726 (1988-01-01), Estkowshi et al.
patent: 4818019 (1989-04-01), Mrotz, III
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