Patent ID: 6857529

Claim:
Pantographic device for conveying loads in vehicle assembly lines; of the type having an elevated guide rail ( 1 ), a shiftable carriage ( 2 ) assembled on the elevated guide rail ( 1 ), an upper frame ( 3 ) suspended from the shiftable carriage ( 2 ), a vertically shiftable lower frame ( 4 ), articulated arms ( 5 ) joining the upper frame ( 3 ) and the lower frame ( 4 ), an arm ( 41 ) on the lower frame ( 4 ) for holding the vehicle load and lifting mechanism for changing the height of the lower frame with regard to the upper frame; characterized in that the lifting mechanism comprises: a horizontally assembled drive shaft ( 6 ) on the upper frame ( 3 ) and with the capacity to rotate, several parallel pulleys ( 7 ) fixed to the drive shaft ( 6 ), two motors ( 8 , 9 ) acting on the opposing ends of the drive shaft ( 6 ) providing it rotational movement and several flat belts ( 10 ) fixed to the respective pulleys ( 7 ) of the drive shaft ( 6 ) on one end and to the lower frame ( 4 ) on the opposite end, the rotation of the drive shaft ( 6 ) in one direction and the other determining the vertical lifting and lowering of the lower frame ( 4 ) respectively with regard to the upper frame ( 5 ).