US Patent 6857529 Pantographic device for conveying loads in vehicle assembly lines

A pantographic device for conveying loads in vehicle assembly lines includes a horizontal assembled drive shaft on an upper frame and with the capacity to rotate, several parallel pulleys fixed to a drive shaft, two motors acting on the opposing ends of the drive shaft providing its rotational movement, and several flat belts fixed to the pulleys of the drive shaft on one end and two a lower frame on the opposite end, so that the rotation of the drive shaft in one direction and the other determines vertical lifting and lowering of the lower frame with regard to the upper frame.