Patent ID: 7823715

Claim:
A belt conveyor, which belt conveyor comprises a telescopic frame, comprising frame blocks which are installed to each other in a slidable manner and comprise at least one frame pipe, wherein at least one frame block comprises a supporting beam connected to at least one frame pipe, an endless conveyor belt for transferring material from the feed end to the discharge end of the conveyor, several idlers connected to the frame for supporting the conveyor belt, a drawing drum and a tilting drum, via which drums the conveyor belt is arranged to pass, an actuator connected to the frame for changing the length of the frame, wherein the frame further comprises a lattice mechanism pivotably mounted to the frame blocks, the lattice mechanism comprising several lever arms which are connected to the frame blocks in such a way that to each frame block two lever arms are pivotally connected and the lattice mechanism is arranged to effect a change in the length of the belt conveyor as a result of the operation of the actuator.