Abstract: The apparatus for mixing cement includes a shaft connected to an engine for rotating the shaft. The shaft has mounted thereon a plurality of paddles for providing a pushing force and arranged so as to channel the flow of cement mix about the shaft to allow complete and efficient mixing. In one embodiment the paddles are arranged with faces parallel to the axis of the shaft and apertures are cutout for controlling the flow. In another embodiment, the paddles are notched plates that are bent to provide pushing surfaces and formed so as to channel the flow about the shaft.

Abstract: The invention is an improved pallet clamp for positioning and holding a pallet supporting a workpiece relative to a machine adapted to operate on the workpiece. The clamp has a base member, a plurality of longitudinally movable registration pins adapted to engage bores on a pallet, a pallet support surface, jaws to engage and clamp the pallet against the support surface, and an actuation means to initially move the registration pins into the bores on the pallet and subsequently move the jaws into clamping engagement.