Patent ID: 8733748

Claim:
A cart comprising: a frame body comprising a top portion, a bottom portion comprising a plurality of castors, and a plurality of connecting bars between the top portion and the bottom portion, which cooperatively defines a receiving space; a tray slidably received in the receiving space for supporting a workpiece; a transmission mechanism comprising: a screw shaft; a driving board comprising a nut engaging with the screw shaft, allowing the driving board to slide along the screw shaft; at least one pair of pulleys mounted on the top portion of the main body and aligned with each other; and at least one rope wound around the at least one pair of pulleys and comprising two opposite ends respectively fixed to the driving board and the tray; and a driving mechanism configured to drive the screw shaft to rotate, the driving board thus sliding along the screw shaft, causing the tray to move up or down for adjusting a height of the tray.