TRENCH-AND-PIT DIGGER WORKING EQUIPMENT Russian patent published in 2001 - IPC

FIELD: earth-moving machines. SUBSTANCE: trench-and-pit digger working equipment is mounted on base chassis and includes frame-mounted chain working member with cutting teeth. Working member has also lower and upper side milling cutters with cutting teeth mounted on shafts on frame, rotary thrower, drive, lifting-and-lowering and working member rocking mechanisms. Lower and upper milling cutters are installed on corresponding shafts at pit digging and at trench digging work. Lower milling cutters are arranged on frame so that external edges of tooth cutting lips do not project beyond the edges of chain working member cutting lips, upper milling cutters being mounted on frame symmetrically relative to its longitudinal axis. Distance between external edges of cutting lips of teeth corresponds to size of trench top width. EFFECT: increased capacity. 2 dwg