Abstract: A portable belt conveyor, particularly a plate belt conveyor for rock crushing systems, including a bridge which is provided with a feed chute and which is supported on an undercarriage via a horizontal shaft and adjustable in its angle by means of at least one adjusting and fixing device, particularly a hydraulic power cylinder. The feed chute is arranged to be displaceable along the length of the bridge until it reaches a position in which the center of gravity of the bridge is at least approximately in the vertical projection plane of the shaft.

Abstract: A crushing implement on rubber tire equipped wheels in which the understructure of the implement can selectively be lifted off the ground hydraulically while resting on the wheels or can be rested on the ground, preferably at three points, while the wheels are lifted off the ground. The implement is equipped with hydraulic pump means for supplying the driving fluid for driving at least some of the wheels and also for supplying actuating fluid to hydraulic cylinder-piston systems for lifting and lowering the understructure, and if desired also to conveyor means for feeding material to be crushed to the crusher rollers of the crushing implement.