Trailer for transporting and launching floating box caissons

Claim 1

A trailer for transporting, launching and retrieving floating box caissons, said trailer comprising: a conventional road chassis; a tip frame mounted above said chassis and pivotally connected about a pivot to the rear end of said chassis; means for pivoting said tip frame about said pivot from a first, horizontal position to a second, inclined position; a sub-frame slidably mounted on said tip frame and movable therealong between a first, forward position and a second, rearward position; a hauling carriage slidably mounted on said sub-frame and movable therealong between a first, forward position and a second, rearward position; means, associated with said tip frame, said sub-frame and said hauling carriage, for moving said sub-frame between said first and second positions thereof with respect to said tip frame and for moving said hauling carriage between said first and second positions thereof with respect to said sub-frame; and lock means, mounted on a rear end of said hauling carriage, for locking engagement to a floating box caisson, such that movement of said hauling carriage between said first and second positions thereof moves the floating box caisson along the top of said sub-frame.