Abstract: A swingable mechanical structure installed to fitness equipment or bicycles includes a machine base, a swing mechanism, and an auxiliary bracket. The swing mechanism includes a rotating shaft, a tilt member, and a swing post. The rotating shaft of the swing mechanism is installed into an assembling slot of the rotating shaft. Both ends of the auxiliary bracket are assembled to the machine base and an end of the swing post. When the rotating shaft is rotated, the rotating shaft is rotated to an angle with the respect to the tilt member, so that the swing post may swing together with the tilt member sideway and rotated around the tilt member. One of the ends of the swing post is limited by the auxiliary bracket, so that the swing post can just swing sideway to produce a mechanical structure with a force input and output conversion.

Abstract: A swingable mechanical structure installed to fitness equipment or bicycles includes a machine base, a swing mechanism, and an auxiliary bracket. The swing mechanism includes a rotating shaft, a tilt member, and a swing post. The rotating shaft of the swing mechanism is installed into an assembling slot of the rotating shaft. Both ends of the auxiliary bracket are assembled to the machine base and an end of the swing post. When the rotating shaft is rotated, the rotating shaft is rotated to an angle with the respect to the tilt member, so that the swing post may swing together with the tilt member sideway and rotated around the tilt member. One of the ends of the swing post is limited by the auxiliary bracket, so that the swing post can just swing sideway to produce a mechanical structure with a force input and output conversion.

Abstract: Disclosed is a waist and leg exerciser, which includes two arched track boards each defining a circularly arched sliding slot, a link, which has two distal ends respectively coupled to and movable along the circularly arched sliding slots of the arched track boards, a seat supported on the link, and two cables for alternatively pulling the two distal ends of the link along the circularly arched sliding slots of the arched track boards to cause the seat to move in an 8-shaped action.