Patent ID: 6394000
Filing Date: 2002-05-28
Classification: B21C,B61D

Abstract:
A car body, including side bodies constituted from extruded stocks, said extruded stocks having extruded directions thereof arranged in the longitudinal direction of said car body;a plurality of quadrangle windows formed to said extruded stocks along the longitudinal direction of said side body; said window comprised of an upper side, a lower side, and left and right sides in the vertical direction of said car body, with corner portions connecting said vertical sides with said upper side and said lower side being circular arcs; wherein plate thickness of face plates of said extruded stocks at regions in upper and lower areas based on connection points between said vertical sides and said circular arcs, respectively, are thicker than plate thickness of said face plates of said extruded stocks at upper and lower locations from said regions; said region having thicker plate thickness based on said connection point at said upper area is a region below said upper side of said window; said region having thicker plate thickness based on said connection point at said lower area is a region above said lower side of said window; and plate thickness of said face plates between said region having thicker plate thickness based on said connection point at said upper area, and said region having thicker plate thickness based on said connection point at said lower area, are thinner than plate thickness of said regions having thicker plate thickness.