EXCAVATOR DRIVE MECHANISM FOR TUNNEL BORING MACHINE

摘要

In a tunnelling machine including a hollow shield, a non-rotatable outer housing mounted in the shield for longitudinal movement, an inner housing rotatably mounted within the outer housing, an excavator including a boom and bucket pivotally mounted on the forward end of the inner housing, and a boom cylinder having a forward portion pivotally engaged with the boom and a rear portion mounted at the rearward portion of the inner housing.