Frame structure of seatback

Details Frame structure of seatback Frame structure of seatback

1996-07-10

1998-09-22

Cuomo, Peter M.

Chairs and seats

Bottom or back

Framework

2974522, 29745236, A47C 702

Patent

active

058104461

ABSTRACT:
A reversed U-shaped base frame for a seatback frame structure is of a monoblock structure, which includes an upper horizontal tubular portion and two side vertical portions. The two side vertical portions extend downward from axially opposed ends of the upper horizontal tubular portion. The base frame is produced from a shaped metal sheet by pressing and curling the same in such a manner that a given portion of the shaped metal sheet, which is shaped to produce the upper horizontal tubular portion, is curled to have a substantially circular cross section. The feature of the invention is that the curled given portion has circumferentially opposed edges which are overlapped each other.

REFERENCES:
patent: 976060 (1910-11-01), Fulton
patent: 2695038 (1954-11-01), Parce et al.
patent: 3604752 (1971-09-01), Macknick
patent: 4695097 (1987-09-01), Muraishi
patent: 5129707 (1992-07-01), Yamauchi
patent: 5131721 (1992-07-01), Okamoto
patent: 5499863 (1996-03-01), Nakane et al.
patent: 5509716 (1996-04-01), Kolena et al.

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