Shell structure for use with a chair having synchronously moving

Details Shell structure for use with a chair having synchronously moving Shell structure for use with a chair having synchronously moving

1993-08-09

1994-08-16

Brown, Peter R.

Chairs and seats

Bottom or back

Contoured back

297DIG2, A47C 702

Patent

active

053380991

ABSTRACT:
A shell for a chair in which a bottom shell structure and a backrest shell structure are connected to supporting frame members. The bottom shell structure has a bottom portion and a partial backrest portion that are connected by a curved portion with plural slots. Sideways notches are connected to the extreme left and right slots and extend toward the left and right edges of the shell structure. The edges of the shell adjacent the notches are curved into a U shape. This construction increases the flexibility of the curved portion, while maintaining a significant portion of the unslotted material strength. A separate shell structure is attached to supporting bars and forms the remainder of the backrest support. This separate shell structure has a jagged cross sectional shape where substantially parallel projections and recesses form grooves which extend the length of the backrest shell.

REFERENCES:
patent: 3669496 (1972-06-01), Chisholm
patent: 3734561 (1973-05-01), Banecki et al.
patent: 4123105 (1978-10-01), Frey et al.
patent: 4368917 (1983-01-01), Urai
patent: 4418958 (1983-12-01), Watkin
patent: 4498702 (1985-02-01), Raftery
patent: 4556254 (1985-12-01), Roberts
patent: 4660887 (1987-04-01), Fleming et al.
patent: 4776633 (1988-10-01), Knoblock et al.
patent: 4856846 (1989-08-01), Lohmeyer
patent: 4892356 (1990-01-01), Pittman et al.

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