Abstract: A reciprocating blade saw wherein the counterbalancing of the drive system includes the provision of two directly opposed and coaxial rams, one attached to the saw blade and the other having a mass equal to the first ram plus the blade, both being attached to a crankshaft by links which have their masses symmetrically distributed. The crankshaft is driven by a hydraulic motor, and all the masses are so matched that the saw is in balance at all speeds and can be operated at high speeds with minimal vibration. The saw is designed for use particularly in the meat industry.

Abstract: A drive system for a reciprocating blade saw wherein a motor rotates an eccentric which rocks a bell crank to reciprocate the saw blade, the eccentric and the bell crank being associated with masses which rotate and rock 180.degree. out of phase with the eccentric and bell crank and are so proportioned as to counterbalance those elements and minimize the vibration of the system. The counterbalancing masses are divided and mounted each side of the working elements so that no lateral torque forces are developed.

Abstract: A straight saw blade adapted for rapid reciprocation, the blade being tapered in cross-section across a substantial part of its width such that it is thinnest at or near the points of the teeth and substantially thicker throughout the portion adjacent to the back. The blade is stiff enough to be operated from one end, without tension.