Abstract: A rolling foot-powered apparatus mounted for movement on rotatable rollers and including at least one upper movable assembly, a lower stationary assembly, and at least one motion-conversion mechanism or an alternatively retractable motion-conversion mechanism. The movable assembly, which is provided with mounted means for movement therewith, and the lower stationary assembly, are cooperatively associated one with another and with the assistance of the motion conversion mechanism or alternatively retractable motion-conversion mechanism are operative such that an oscillating motion of the movable assembly or alternatively a linear motion of the movable assembly is converted either to a continuous circular motion of the rotatable shaft or alternatively to the rotatable rollers for the purpose of imparting a continuous linear motion of the rolling foot-powered apparatus.

Abstract: A rolling foot-powered apparatus mounted for movement on rotatable rollers and including at least one upper movable assembly, a lower stationary assembly, and at least one motion-conversion mechanism or an alternatively retractable motion-conversion mechanism. The movable assembly, which is provided with mounted means for movement therewith, and the lower stationary assembly, are cooperatively associated one with another and with the assistance of the motion conversion mechanism or alternatively retractable motion-conversion mechanism are operative such that an oscillating motion of the movable assembly or alternatively a linear motion of the movable assembly is converted either to a continuous circular motion of the rotatable shaft or alternatively to the rotatable rollers for the purpose of imparting a continuous linear motion of the rolling foot-powered apparatus.

Abstract: A rotary internal combustion engine including a plurality of variable compression ratio rotating combustion chambers or alternatively stationary combustion chambers, a multi-piston movable assembly or alternatively a multi-sector movable assembly, a multi-sector stationary assembly or alternatively multi-piston stationary assembly with means for effecting ignition or alternatively for injecting fuel into the combustion chambers. The combustion chambers are formed by the multi-sector stationary assembly and the multi-piston movable assembly such that each of the pistons is located radially of the engine's pre-definable center axis. The stationary assembly, the movable assembly and the pistons of the movable assembly are cooperatively associated one with another so that the movable assembly is capable of being made to undergo rotating motion about the engine's center axis in a circular path about the stationary assembly.

Abstract: A four stroke internal combustion engine including a combustion chamber, a movable assembly, a stationary assembly and a motion conversion mechanism. The combustion chamber is formed between the stationary assembly and the movable assembly so as to be located radially of the predefinable pivot point. The movable assembly and the stationary assembly are cooperatively associated one with another such that the movable assembly is capable of being made to undergo oscillating motion about the aforementioned predefinable pivot point in a semicircular path about the stationary assembly. Motion is imparted to the movable assembly by virtue of the forces produced during combustion in the combustion chamber acting on a vane which projects outwardly of the movable assembly into the combustion chamber.

Abstract: A four-stroke reciprocate internal combustion engine which has at least one conventional piston mounted on a carrier body of a power transmission mechanism and both sliding in line on sliding means attached to the engine stator in a linear reciprocate motion. On said carrier is mounted a framed-type internally or externally teethed gear which can be fixed or sliding independently in a linear reciprocate motion perpendicular to the carrier's linear reciprocate motion. A circular-type externally teethed gear which is mounted on a rotatable power transmission shaft engages the teeth of the framed-type gear and they are held in constant engagement with the help of one or more independent and freely rotating follower rollers rolling on the external or internal surface of the framed-type gear exactly at the opposite side of gear's engagement point.