Abstract: An internal magnetic resistance system for use with a fitness device includes an axle, inertia wheel, transmission wheel, magnetic permeable ring and electromagnet. The inertia wheel is disposed at the axle and has a protruding ring portion. The transmission wheel connects to the inertia wheel and transfers an external force to the inertia wheel to cause the inertia wheel to rotate. An outer circumferential surface of the magnetic permeable ring is fixedly disposed on an inner circumferential surface of the protruding ring portion such that the magnetic permeable ring rotates together with the inertia wheel. The electromagnet is disposed in the protruding ring portion and surrounded by the magnetic permeable ring. The electromagnet has a support fixedly disposed at the axle and iron cores disposed at the support. Each said iron core is surrounded by a coil and separated from the magnetic permeable ring by a gap.

Abstract: A frame lifting mechanism includes a base, a motor, a lead screw, a sliding member, a lifting member and a supporting shaft. The motor is connected to the lead screw, and the lead screw is fastened onto a transmission tube, allowing the transmission tube to move forward and backward while being driven by the lead screw. The sliding member is installed on a sliding track arranged on the base and connected to the transmission tube, allowing the sliding base to actuate with the transmission tube synchronously. A rear end of the lifting base is pivotally attached onto the base for support, and the supporting member uses its two top and bottom ends to be pivotally attached onto the lifting member and the sliding member respectively, allowing the supporting shaft to utilize the movement of the sliding member to drive the lifting member to move upward and downward.

Abstract: An elliptical machine includes a machine frame and two pedal units each including a vertical arm having a top end pivotally connected to the machine frame and swingable back and forth, a driving main arm having a front end arranged on an opposing bottom end of the vertical arm in a vertically swingable manner, a pedal mount arranged on an opposing rear end of the driving main arm and swingable left and right, a pedal arranged on the pedal mount and swingable left and right, a slanting rod having a front end arranged on the vertical arm in a vertically swingable manner and an opposing rear end arranged on the pedal mount in a universally rotatable manner, and a rocking link that has a front end arranged on the rear end of the driving main arm and swingable back and forth and up and down.

Abstract: A fan vehicle includes a driving wheel, a wind resistance wheel, a resistance unit and a power generating unit. The driving wheel can be driven by two pedals. The wind resistance wheel is connected to the driving wheel via a transmission unit in order to rotate synchronously. The resistance unit includes a mandrel, a flywheel installed on the mandrel and connected to the transmission unit, a magnetic ring mounted onto the flywheel and a magnet securement rack installed on the outer perimeter of the flywheel. One side of the magnet securement rack includes a plurality of magnets. The magnet securement rack can be pulled by a cable in order to change the distance of the magnets relative to the magnetic ring in order to adjust the magnitude of the magnetic resistance. The power generating unit is installed inside the flywheel.

Abstract: A two-way transmission mechanism for fitness equipment includes a first transmission wheel mounted at a crankshaft and connected to a first relay wheel by a first transmission belt, a second transmission wheel connected to a second relay wheel by a second transmission belt, a transmission shaft connecting the first and second relay wheels, a one-way ratchet mounted between the first relay wheel and the transmission shaft for power transmission therebetween in one direction, and a motor having a motor shaft connected with the second transmission wheel.