Chairs and seats – Back movement resiliently opposed in operating position – Back and seat adjust simultaneously
Patent
1997-08-22
1999-10-12
Cuomo, Peter M.
Chairs and seats
Back movement resiliently opposed in operating position
Back and seat adjust simultaneously
2973001, 2973033, A47C 300
Patent
active
059645032
ABSTRACT:
A chair having concurrently operative function between a seat and a backrest is disclosed which has a simple structure and is capable of exhibiting smooth motion and which has enhanced degree of freedom in its design because of the simple structure. The chair comprises a shallow box-like base member 2 mounted on an upper portion of a support pillar 1 and forward protruding below a front half of a seat; link members 3, 4 back-and-forth swingably provided on right and left front ends of the base member 2, the link members 3, 4 extending upward; and a swing member 6 having its front ends pivotally attached to the base member 2 at an intermediate position of the base member 2 in front of the support pillar 1 by means of a horizontal shaft 7 in the presence of a torsion coil spring 8, the swing member 6 having a portion 6k, 6j extending substantially right upward at its rear end, to the substantially upright portion 6k, 6j being attached a backrest, the swing member being provided with seat supporting portions 6f, 6g behind the intermediate pivotal point so as to support a seat frame 11 by the link members 3, 4 and the seat supporting portions 6f, 6g. In the chair, the seat supporting portions 6f, 6g provided on the swing member 6 are so formed as to upward extend from the upper surface of the swing member 6; the seat frame 11 has a contour in plan which substantially corresponds to outline of the seat and which is substantially rectangular or substantially circular when viewed in plan; the seat frame 11 is provided in its bottom surface with tongue-shaped support parts 11a-11d downward extending therefrom, and lower portions of the support parts are connected to upper end portions of the link members 3, 4 by means of a horizontal shaft 12 and lower portions of the rest of the support parts are connected to upper portions of the seat supporting portions by means of horizontal shafts 13a, 13b to thereby support the seat frame 11 at a distance from the upper surfaces of the base member 2 and the swing member 6.
REFERENCES:
patent: 4709962 (1987-12-01), Steinmann
patent: 4761033 (1988-08-01), Lanuzzi et al.
patent: 4830431 (1989-05-01), Inoue
patent: 4966411 (1990-10-01), Katagirl et al.
patent: 5308144 (1994-05-01), Korn
patent: 5584533 (1996-12-01), Schrewe
patent: 5658045 (1997-08-01), Van Koolwijk et al.
Cuomo Peter M.
Inoue Associates, Inc.
Vu Stephen
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