Abstract: A duel functional pedal-operated exercise bicycle comprises: a front wheel, a rear wheel mounted to a rear end of a frame, a pair of reciprocating pedals disposed to two sides of the frame, a crank means disposed to a middle portion of the frame characteristically rotated in a backward direction, a chain system, and a pair of rotating direction transmitting gears, and further comprising a rear wheel lifting stand to use for an indoor exercising therefore.

Abstract: The present invention relates to a manufacturing method of laborsaving engine and engine manufactured by it, it comprises a engine mount, cylinder, throttle, spark plug, piston, piston connecting rod, crankshaft and laborsaving device, the laborsaving device further comprises a first laborsaving connecting rod and second labor connecting rod. Wherein one end of the first laborsaving connecting rod is connected on the engine mount, and another end is connected to the piston connecting rod of the cylinder, the second laborsaving is connected to the first laborsaving connecting rod at a proper position, and another end opposite to the connection end of the second laborsaving connecting rod and the first laborsaving connecting rod is connected to the crankshaft, enabling power transmission from the piston connecting rod to the crankshaft to generate a lever action through the disposition of the first and second connecting rods, and further to attain the laborsaving effect of power output of the engine.

Abstract: A scooter-like bicycle having a simple labor-saving power transmission mechanism is provided. The mechanism comprises a clockwise gear, a crank, and two pedals each having one end coupled to main frame and the other end coupled to a bearing. The bicycle moves as rider pushes pedals in a reciprocating motion. Torque of the bicycle is a total length consisting of the length of crank and the length of most portions of pedal times a force exerted on pedals. Hence, it may lessen physical labor. Further, in use total weight of rider is exerted on pedals since rider is at a standing position. This can save the physical labor of legs. Furthermore, there is no restriction on the wearing of rider.