Abstract: A high speed trenching machine has a rotatable digging unit with a rim assembly symmetrically constructed relative to a flat center ring member and includes an outer peripheral spoil receiving section comprised of a pair of side by side annular channel ways open to opposite sides of the digging unit and formed in the outer peripheral side walls thereof with a series of circumferentially spaced digging teeth arranged in a staggered relation in operative association with respective spoil receiving inlets. The circumferential extent of an inlet is less than the radial dimension of a channel way, the inner peripheral side wall of which is inclined away from the outer peripheral side wall thereof in a direction toward the channel way open side.

Abstract: A molding station having packer heads is positioned between a pair of stripping stations having ejectors and a mold box having first and second mold sections is movable between first and second positions with the ejectors at the one stripping station registering with the one mold section and the packer heads registering with the other mold section and at the second position the ejectors at the other stripping station registering with the other mold section and the packer heads registering with the first mold section. The completed molded product is ejected as the mold box is raised and the molded product is formed as the mold box is lowered. The mold box is raised and lowered between top and bottom table halves and when in the lowered position is movable between the first and second positions on rails having legs adapted to engage a stationary support when the lower table half is lowered a predetermined distance.