Patent ID: 7503414

Claim:
A movable subframe for a tractor-trailer, said subframe being movable longitudinally beneath said tractor-trailer and comprising: a pair of transversely spaced-apart main members extending longitudinally relative to said tractor-trailer, each of said main members including a vertically disposed wall, a horizontally-extending upper wall and an upper bend disposed between and connected to said vertically disposed wall and said horizontally-extending upper wall; at least one cross member extending between and being attached to said main members; and a retractable pin mechanism for selectively positioning said subframe relative to a body of said tractor-trailer, and at least one of said main members being formed with at least one opening for receiving a pin of said retractable pin mechanism, said opening having a horizontally-extending upper portion adjacent said upper bend whereby distortion of the main member adjacent the top of said opening is reduced during formation of said main member.