Patent ID: 6976697

Claim:
A passenger carrier frame comprising: a lower frame member; a folding frame member including a folding joint; an upper frame member, the frame members having pivotal connections to connect them adjacent their ends to form a triangular arrangement in side view and the pivotal connections and the folding joint together permitting the frame to be folded; and a frame folding control acting at a selected one of the pivotal connections to drive rotation at that pivotal connection to cause folding and unfolding of the frame and being actuatable to lock against rotation at that pivotal connection and the frame folding control including a folding link including a first link portion pivotally fixed to the upper frame member and a second link portion pivotally fixed to the folding frame member and a link pivotal connection between the first link portion and the second link portion, the folding link being actuatable to lock by locking the link pivotal connection against pivotal movement.