US Patent 7540510 Movable rack

A movable rack for supporting articles. In a preferred embodiment, the rack comprises a frame which supports first and second shelf groups. The second shelf group can be added to the rack when additional shelf space is required and can be removed when additional shelf space is not needed or when the rack is to be moved through or stored in places with limited floor space. Wheel supports and wheels are secured with respect to the frame permitting the rack to be moved. The wheel supports are extensible outward from the frame thereby improving rack stability, particularly when one or more of the second group shelves are attached or when it is desired to move the rack.