Abstract: An extendable and retractable step structure mounted to a recreational or like vehicle to facilitate passenger ingress and egress. The step structure basically includes a frame mountable to the vehicle beneath a doorway or other passenger ingress-egress location, at least one step tread and a movable linkage arrangement supporting the step tread from the frame for controlled movement between a retracted position wherein the step tread and the linkage arrangement are withdrawn into frame and an extended position wherein the step tread and the linkage arrangement are extended outwardly from the frame. Four embodiments are disclosed, two being equipped with a single step tread, a third having two step treads, and a fourth having three step treads, for selective use in differing vehicles having differing above-road elevations.

Abstract: A folding bed frame structure comprises spaced apart folding side frame assemblies connected with transversely extending cross members by a combination of mating frictionally interfitting "swaged" and tongue-and-slot connections which do not require or utilize fasteners, thereby permitting the structure to be shipped and stored in disassembled condition. Side frame elements of the bed frame structure have an angled base portion with an arcuate portion extending therefrom to simulate the appearance of tubular elements.

Abstract: A folding sofa bed frame having head, intermediate and foot bed sections pivotally connected end-to-end and constrained by a linkage arrangement to move in a predetermined pattern between a folded position and a horizontally extended position. A transverse mattress support bar is affixed to a pivoting bell crank link for movement of the mattress support bar into a dropped position spaced below the intermediate section when the structure is extended, thereby out of interference with comfortable sleeping use of the bed frame.

Abstract: A folding sofa bed frame having head, intermediate and foot bed sections pivotally connected end-to-end and constrained by a linkage arrangement to move in a predetermined pattern between a folded position and a horiziontally extended position. The linkage arrangement includes a bracing link with a stud which, in the extended position, engages the rearward side of an upright support link by which the structure is mounted within the sofa bed frame, to act as a stop member against undesired accidental upward tilting of the structure when weight or force is placed against the head section. A transverse mattress support bar is affixed to a pivoting control link also operated by the bracing link for movement of the mattress support bar into a retracted position closely adjacent the intermediate section when the structure is folded and a dropped position spaced below the intermediate section when the structure is extended, thereby out of interference with comfortable sleeping use of the bed frame.