Extendable tray structure

An extendable tray structure, used for receiving a server, said extendable tray structure comprising:

• a tray main body, having a first open end, wherein said tray main body comprises:
• a main bottom plate, having a first locking through part, a second locking through part and a third locking through part which are located near said first open end of said tray main body, wherein said second locking through part is located between said first locking through part and said third locking through part and at a position near the center of said main bottom plate;
• and
• a pair of main side plates, located on two opposites sides of said main bottom plate, wherein each of said main side plates has a fourth locking through part adjacent to said first open end;
• a tray extension body, having a second open end, wherein said second open end is located at the same side with said first open end, and said tray extension body is connected to said tray main body and is overlapped with a portion of said tray main body, said tray extension body comprising:
• an extension bottom plate, having a first stripe-shaped opening, a second stripe-shaped opening and a third stripe-shaped opening which are parallel to one another and are corresponding to said first locking through part, said second locking through part and said third locking through part respectively;
• and
• a pair of first extension side plates, located on two opposite sides of said extension bottom plate, wherein each of said first extension side plates has a fourth stripe-shaped opening corresponding to said fourth locking through part, and said first stripe-shaped opening, said second stripe-shaped opening, and said fourth stripe-shaped opening all extend from one end near said second open end to the other end away from said second open end, said third stripe-shaped opening extending from near the other end spaced away from said second open end, to near a center of said extension bottom plate;
• a first locking element, a second locking element and a third locking element, installed in said first locking through part, said second locking through part and said third locking through part via said first stripe-shaped opening, said second stripe-shaped opening and said third stripe-shaped opening, respectively, thereby combining said extension bottom plate with said main bottom plate;
• and
• a pair of fourth locking elements, wherein each of said fourth locking elements is installed in said fourth locking through part of said tray main body via said fourth stripe-shaped opening, thereby combining said first extension body side plates with said main side plate, so that the length of said extendable tray structure is adjustable for receiving servers of various sizes by adjusting the position of said first locking element in said first stripe-shaped opening, that of said second locking element in said second stripe-shaped opening, that of said third locking element in said third stripe-shaped opening, and that of each of said fourth locking elements in said fourth stripe-shaped opening.