Abstract: An improved dynamo-electric machine such as an electric motor is disclosed including a novel commutator configuration and novel means for aligning a first machine housing relative to a second machine housing. The commutator includes an insulating member having a first and a second end with an outwardly extending member having a plurality of apertures therein extending from the first end of the insulating member. A recess extends partially through the insulating member from the second end of the insulating member. A plurality of electrically conducting members each having a first and a second mounting portion are established about a substantially cylindrical surface of the insulating member with the first mounting portions of the electrically conducting members extending through the apertures in the insulating member. The remaining portions of the first mounting members are bent radially outwardly to provide mounting terminals for connection with the rotor coils.

Abstract: A portable, power-operated sabre saw having a power driven saw blade holder which is curved and which is mounted in the sabre saw housing for reciprocation along a curved path that is determined by its curvature to impart to a blade carried thereby a component of cutting stroke travel that is in the direction in which the blade is urged against a workpiece to cut the workpiece. Another feature disclosed herein is a counterweight which dynamically counterbalances the mass of the saw blade holder and the saw blade and which is recessed to receive a power driven gear that supplies the motion for reciprocating the holder and the counterweight. The counterweight is confined between and guided for reciprocating motion by opposed side wall regions of a longitudinally split housing, and a guide pin, which is trapped between the halves of the split housing, extends through a slot in one end of the counterweight to provide a further guide for the counterweight.

Abstract: A portable, power-operated sabre saw having a power driven saw blade holder which is curved and which is mounted in the sabre saw housing for reciprocation along a curved path that is determined by its curvature to impart to a blade carried thereby a component of cutting stroke travel that is in the direction in which the blade is urged against a workpiece to cut the workpiece. Another feature disclosed herein is a counterweight which dynamically counterbalances the mass of the saw blade holder and the saw blade and which is recessed to receive a power driven gear that supplies the motion for reciprocating the holder and the counterweight. The counterweight is confined between and guided for reciprocating motion by opposed side wall regions of a longitudinally split housing, and a guide pin, which is trapped between the halves of the split housing, extends through a slot in one end of the counterweight to provide a further guide for the counterweight.