Seat back frame

Details Seat back frame Seat back frame

1994-05-03

1996-03-19

Brown, Peter R.

Chairs and seats

Bottom or back

Framework

2974528, A47C 740, B60N 244

Patent

active

054998638

ABSTRACT:
The upper frame 3 and a pair of the side frames 5 in the frame body 2 are simultaneously formed by bending the first frame plate 20 which is obtained from a raw flat plate by pressing treatment. And the upper frame 3 is formed into a pipe form having a slit 6 with edge portions and the slit 6 is welded at four positions corresponding to the bending portions 3B and the concave portions 9 in the horizontal portion 3C, thereby the slit connecting portions 10 are formed. Accordingly, based on that main members for constructing the seat back frame 1 are formed from the first flat frame plate 20, number of the members for constructing the seat back frame 1 and process number for assembling thereof can be easily reduced. And in case that weight of a driver is locally loaded on the seat back frame 1, the upper frame 3 can resist twisting moment occurring due to weight of the driver based on high rigidity produced from the slit connecting portions 10, therefore it can prevent the seat back frame 1 from being seriously deformed.

REFERENCES:
patent: 1684062 (1928-09-01), Leach
patent: 2371407 (1941-10-01), Neely
patent: 2720914 (1955-10-01), Doty
patent: 3544164 (1970-12-01), Ohta
patent: 4159847 (1979-07-01), Arai
patent: 4290647 (1981-09-01), Hensel et al.
patent: 4364607 (1982-12-01), Tamburini
patent: 4536030 (1985-08-01), Sakurada et al.
patent: 4544204 (1985-10-01), Schmale
patent: 4619482 (1986-10-01), Itsuki
patent: 4695097 (1987-09-01), Muraishi
patent: 5050932 (1991-09-01), Pipon et al.
patent: 5131721 (1992-07-01), Okamoto
patent: 5328248 (1994-07-01), Nishiyama
German Abstract DE 41 38 647 A1 filed May 27, 1992 without translation.

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