Slot assembly and workpiece

A slot assembly, configured to be inserted by a workpiece, the workpiece having a first engaging portion, the slot assembly comprising:

• a base having an accommodating space, the accommodating space having an opening end, the workpiece configured to be inserted into or removed from the accommodating space through the opening end;
• a tray movably disposed on the base and located in the accommodating space, the tray having a bearing surface for bearing the workpiece, the tray being movable between a removed position and an inserted position, the tray relatively close to the opening end when the tray is at the removed position, the tray relatively away from the opening end when the tray is at the inserted position, the tray being moved from the removed position to the inserted position by being pushed by the workpiece;
• and
• a fastener movably disposed on the tray, the fastener having a second engaging portion;
• wherein when the tray is at the removed position, the fastener is at a released position, and the second engaging portion of the fastener is located away from the bearing surface with respect to the tray and detached from the first engaging portion;
• when the tray is at the inserted position, the fastener is at a fixed position, and the second engaging portion of the fastener is located close to the bearing surface with respect to the tray and fixed to the first engaging portion.