Toyota Shatai Kabushiki Kaisha

Hideki Nakane

Yasuhiro Nishii

Masami Sugiura

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.

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Kariya, Japan

Hideki Nakane