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

1991-12-27

1994-05-24

Dorner, Kenneth J.

Chairs and seats

Bottom or back

Directly connected bottom and back

29745221, 29745229, 297DIG2, A47C 702

Patent

active

053142403

ABSTRACT:
A shell for a chair in which a bottom shell structure and a backrest shell structure are connected to supporting frame members such that when a light load is applied to the separate backrest shell the backrest shell will bend to accommodate the load, whereas when a heavy load is applied to the backrest shell the backrest bends and the supporting bars rock backwards. The bottom shell structure has a bottom portion and a partial backrest portion which are integrally formed on the same material and 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), Barecki 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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