| 摘要 |
In order to provide a car-body structure which has few different kinds of structural members, a small number of structural members, a small occurrence of strain and which is high in dimensional accuracy, and, consequently, in assembling accuracy, each of the car-body blocks is formed of a one-piece structure consisting of an outside plate and a reinforcing plate, each of which is made of a metallic material. The reinforcing plate is composed of panels divided into a plurality of sections; and, each of the panels has a plurality of beads in the form of a long and narrow projection formed by plastic working of a metal plate and extending in the longitudinal direction of the block. A bar-ring in the form of a long hole with a rib extending in the direction of the block is formed between the beads through plastic working. Further, at least one post-shaped protrusion extending in the direction intersecting at a right angle with the bead is provided in each of panels of the reinforcing plate. The bead, the barring and the post-shaped protrusion are projected in one side of the surface of the panel; at least one end of the bead and the post-shaped protrusion are connected so as to form one structure; and the panel and the outside plate are joined in a unit.
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