Patent ID: 8490905

Claim:
A horizontal shaft impact crusher comprising a crusher housing having an inlet for material to be crushed and an outlet for material that has been crushed, an impeller mounted in the crusher housing for rotation about a substantially horizontal axis, a curtain disposed in the crusher housing and arranged so material accelerated by the impeller may be crushed thereagainst, and an adjustment device for adjusting the position of said curtain relative to the impeller, wherein at least two guide rods are disposed in the crusher housing and to which said adjustment device is slidably connected, the adjustment device including a locking device positionable selectively in: a holding state in which the locking device is de-energized and arranged to apply a holding force for holding said adjustment device in a crusher operation position relative to the guide rods, and an adjustment state in which the locking device is energized and arranged to release the holding force, thereby enabling displacement of the adjustment device relative to the guide rods.