| 摘要 |
PCT No. PCT/GB89/01264 Sec. 371 Date Jul. 17, 1990 Sec. 102(e) Date Jul. 17, 1990 PCT Filed Oct. 20, 1989 PCT Pub. No. WO90/04534 PCT Pub. Date May 3, 1990.A frame structure of aluminum alloy having a pair of spaced apart side rails (1) and a plurality of spaced apart cross-members (2) each comprising a central tubular formation and extending between the side rails, characterized in that at least over a major part of its length each side rail (1) comprises at least three hollow extrusions (4-6) welded together at positions of low stress and has more than two longitudinally extending re-entrant formations opening inwardly thereof at selected low stress locations thereon to receive the heads of bolts and in that an end plate formation (3) is welded to each end of the tubular formations, the bolts engaging through apertures in the associated end plates (3) to removably secure together the side rails (1) and the cross-members (2) only by the bolts at any desired location along the major part of the length of each side rail (1).
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