| 摘要 |
<p>An automobile bumper beam which can be easily formed by blow molding plastics materials and yet exhibits greatly enhanced mechanical strength comprises an integral elongated hollow body having a generally U-shaped cross section consisting of an upper board (1), side board (3) and lower board (2), the upper and lower peripheries of the side board being joined with the frontal peripheries of the upper and lower boards, respectively, in which each of the upper board, side board and lower board has a double-wall structure consisting of an outer wall (1a, 2a, 3a) and an inner wall (1b, 2b, 3b) and the inner wall of the side board (3b) is bent in a zigzag or wavy form towards the outer wall (3a) in the longitudinal direction, the zigzag or wavy beding being sufficiently deep that each crest of the zigzag or wavy form towards the outer wall of the side board reaches and is bonded to the outer wall of the side board. <IMAGE></p> |
