Storage apparatus

A storage apparatus comprising:

• trays each comprising a supporting plate, a confining plate formed on the supporting plate, and a lug formed on an external side of the confining plate;
• a shaft inserted in the lugs of the trays to connect the trays to one another so that each of the trays is rotatable between a withdrawn position whereby the trays overlap one another and a spread position relative to a lowermost one of the trays;
• a base element attached to a lower end of the shaft, wherein the base element is connected to the confining plate of a second one of the trays by a connecting element, wherein the base element is located below the lowermost tray when the trays overlap one another;
• a first wheel assembly comprising wheels attached to a lower face of the lowermost tray;
• and
• a second wheel assembly comprising wheels attached to a lower face of the base element, wherein the wheels of the first and second wheel assemblies cover a first area when the trays overlap one another and cover a second area when the trays fully spread from one another, wherein the first area is smaller than the second area.