Abstract: Fuel/air mixture is introduced transversely through cylinder into combustion chamber where it is ignited by spark plug to drive compound piston assembly to bottom of its stroke to rotate drive shaft. In another embodiment, air is introduced transversely through cylinder into combustion chamber, and diesel fuel is injected into combustion chamber and ignited when compound piston assembly reaches the top of its stroke to drive down compound piston assembly and rotate drive shaft.

Abstract: Blower forces fuel/air mixture into bore of cylinder head against small diameter piston of compound piston assembly, forcing assembly down in engine cylinder, permitting fuel/air mixture to enter main cylinder of engine in which it is ignited. Exhaust forces assembly to bottom of its stroke. Roller bearings on large diameter piston engage sloping surface on swash plate causing rotation of drive shaft.

Abstract: In diesel engine, blower forces air into bore of cylinder head against small diameter piston of compound piston assembly forcing assembly down in engine cylinder, permitting air to enter combustion chamber. Diesel fuel injector introduces diesel fuel into combustion chamber where it mixes with injected air. Momentum of system forces compound piston assembly to the top of its stroke, compressing the air/diesel fuel mixture to the ignition point.

Abstract: Blower forces fuel/air mixture into bore of cylinder head against small diameter piston of compound piston assembly, forcing assembly down in engine cylinder, permitting fuel/air mixture to enter main cylinder of engine in which it is ignited. Exhaust forces assembly to bottom of its stroke. Roller bearings on large diameter piston engage sloping surfaces on swash plate causing rotation of drive shaft.

Abstract: Fuel/air mixture is introduced transversely through cylinder into combustion chamber where it is ignited by spark plug to drive compound piston assembly to bottom of its stroke to rotate drive shaft. In another embodiment, air is introduced transversely through cylinder into combustion chamber, and diesel fuel is injected into combustion chamber and ignited when compound piston assembly reaches the top of its stroke to drive down compound piston assembly and rotate drive shaft.

Abstract: In diesel engine, blower forces air into bore of cylinder head against small diameter piston of compound piston assembly forcing assembly down in engine cylinder, permitting air to enter combustion chamber. Diesel fuel injector introduces diesel fuel into combustion chamber where it mixes with injected air. Momentum of system forces compound piston assembly to the top of its stroke, compressing the air/diesel fuel mixture to the ignition point.

Abstract: Blower forces fuel/air mixture into bore of cylinder head against small diameter piston of compound piston assembly, forcing assembly down in engine cylinder, permitting fuel/air mixture to enter main cylinder of engine in which it is ignited. Exhaust forces assembly to bottom of its stroke. Roller bearings on large diameter piston engage sloping surfaces on swash plate causing rotation of drive shaft.

Abstract: Compound piston assembly in cylinder of engine has small diameter piston engaging central bore in cylinder head mounted within cylinder and large diameter piston engaging cylinder. Swash plate, secured to drive shaft, engages large diameter piston. Two such engines may be mounted in opposition, engaging opposite faces of the swash plate. Alternatively, compound piston assembly is reciprocated in cylinder by crank operated by cam on drive shaft.

Abstract: A locking shaft is provided for winding of elongated materials around a drum core. The winding core is provided with an clamp which is able to expand or contract the effective diameter of the shaft so as to engage a drum core thereto during winding.

Abstract: A contour stitching system in which there is provided a stitch pattern cartridge for use with a contour stitching machine for making a predetermined stitch pattern in juxtaposed garment pieces. The machine has a sewing head with a threaded needle. A clamping member releasably secures the juxtaposed garment pieces in a predetermined plane and displaces them under the needle of the sewing head. A follower means is associated with the clamping member for displacing same. The cartridge comprises a housing having a top wall with a guide slot therein which defines a predetermined stitch pattern path. Engagement drive means is provided for displacing the follower means when placed in the guide slot and in a predetermined manner whereby the garment pieces will be displaced under the needle in a manner determined by the pattern path of the guide slot.