A collapsible support structure includes at least a horizontal support structure, a vertical support structure, and an axle assembly. In use, the collapsible support structure may be folded/unfolded between a deployed configuration, in which the collapsible support structure may be capable of rolling along a support surface to transport items, and a stowed/storage position, in which the collapsible support structure is collapsed in a compact geometry for storage. The axle assembly enables removal of the wheels from the axle for storage of the collapsible support structure. The axle may be repositionable between a deployed position and a storage position. The axle may be equipped with a retaining unit that retains the axle in the deployed position.

The present disclosure provides an easy assembling and disassembling wheel component, including a wheel, a rotation shaft and an engaging member, wherein a mounting hole is disposed on a center of the wheel, an accommodating groove is disposed at one end of the rotation shaft, the engaging member is movably engaged in the accommodating groove and is swingable between a first position and a second position. When the engaging member is in the first position, the engaging member and the rotation shaft can pass through the mounting hole of the wheel; when the engaging member is in the second position, the rotation shaft is connected with and locked to the wheel. The easy assembling and disassembling wheel component according to the present disclosure has advantages of simple structure, quick and convenient assembling and disassembling. And, the present disclosure also provides five kinds of easy assembling and disassembling wheel components.

A foldable wheelbarrow, including a frame portion, a tray portion detachably coupled to top portions of the frame portion to store objects therein, an axle detachably coupled to a front end of the frame portion, and a wheel detachably and spinnably connected to the axle at the front end of the frame portion, such that the wheel is spinnable to allow the folding wheelbarrow to move.