Patent ID: 6135269
Filing Date: 2000-10-24
Classification: B64D,B65G,G01N

Abstract:
A drive roller unit for conveying objects on a freight deck of an aircraft comprisinga drive motor;a drive roller driven by the drive motor and which in an operating first position can be brought into frictional engagement with a bottom surface of an object being conveyed and located above the drive roller;a lifting motor;a lifting mechanism controlled by the lifting motor to raise the drive roller from a retracted, resting second position into the operating first position;a control means for controlling operation of the drive motor and the lifting motor;a differential velocity measuring means for measuring a difference between a velocity of the drive roller and a velocity of said object being conveyed to determine a slippage; anda regulating means to which an output signal from the differential velocity measuring means is sent and which regulates the control means and thereby the operation of at least one of the drive motor and the lifting motor to reduce any slippage between the drive roller and the bottom surface of said object being conveyed.