Abstract: A stroller wheel assembly is mounted on a bicycle trailer tongue to permit operation as either a trailer or a separate three-wheel stroller. A clamping member, attached to the tongue of the trailer, includes a boss which extends transversely outward. A mating socket is provided on a pivot member, the pivot member being attached to a fork which rotationally supports a wheel. The preferred shape of the boss and mating socket is an equilateral triangle. The triangular socket of the pivot member engages the triangular boss of the clamping member in two positions, one with the wheel in the down position for stroller use and the other with the wheel in a rearward position for bicycle trailer use. Centrally fixed to and extending outwardly from the triangular boss is a threaded member which acts as an axis for rotation of the pivot member between the two positions.

Abstract: A collapsible bicycle trailer includes a rigid chassis frame, hinged side rails, a side rail locking bar, a hinged tongue, and quick release wheels. The chassis frame has a generally rectangular-shaped outer frame member, and inner frame members spaced inwardly from and parallel to, the sides of the outer frame member, with wheels rotating between the outer and inner frame members. On each side of the chassis frame are positioned a pair of side rail hinge members to which are attached the lower ends of the side rails which rotate between an extended, vertical position and a folded horizontal position. The side rail hinge members also are designed to provide the connecting means between the outer and inner frame members. A side rail locking bar is pivotally attached to the top of one side rail and unfolds to securely connect to the top of the other side rail, forming a roll bar assembly.

Abstract: A bicycle trailer hitch which attaches to the bicycle between the chain stay and the seat stay at the crotch formed at the convergence of the two stays, the method of attachment being by three attaching members affixed to and extending inward from a main hitch member to which the bicycle trailer is connected. The three attaching members include a cone-plate member, wherein the intersection of a cone and a plate form a notch which engages the crotch between the two stays; a fixed finger located beneath the chain stay, and a movable finger located above the seat stay. Movement of the movable finger towards the seat stay is accomplished a pivoting member and a threaded tightening member, each attached pivotally at one end to the main hitch member, wherein the non-attached, threaded end of the tightening member passes through an aperture in the pivoting member so that rotation of a threaded knob engaged to the tightening member past the pivoting member will cause the knob to press against the pivoting member.