Abstract: A tube folder includes a top shell, a bottom shell and an instant clasp set; wherein the top shell is provided with two sets of lug holes; the bottom shell is provided with two plug tubes; the instant clasp set covers a dismount handle which has a set of joined segments at its terminal, and an empty space formed in between the two joined segments; and a shaft, fitted in the empty space of the joined segments; each set of the lug holes and corresponding plug tube has been bound by a hinge, so does the joined segments of the dismount handle and the shaft; the surfaces of the top and the bottom shells are shaped into reinforcing ribs, providing handy fitting and enhanced joint when connecting to the tubes.

Abstract: A bike handle tightening device after separated from a bike frame includes a fix tube fixed on a bike frame and having a hollow interior, a vertical rod of a handle, a threaded rod inserting in the vertical rod from top and having a lower end protruding out of the vertical rod, and a tightening member screwing with the threaded rod and having a sloped end surface. The vertical rod and the tightening member are inserted in the fix tube, and the threaded rod is rotated to force the tightening member to move nearer to and contact and rotate along a sloped bottom end surface of the vertical rod so as to let the axis of the vertical rod and the tightening member move away from each other so that the vertical rod and the tightening member push against opposite portions of an inner wall of the fix tube to tighten the handle therein, reducing the size of the bike collapsed for convenience of transporting and storing and helping stabilize the bike after collapsed.

Abstract: A hinge for a foldable bicycle includes a first plate and a second plate each having a side pivotally attached to each other. A quick release device is mounted on one of the two plates to hold the other plate in place when the two plates abut each other. The hinge for a foldable bicycle includes a lock bolt movably mounted in one of the two plates and a hole defined in the other plate. The lock bolt is inserted into the hole after the two plates abutting each other to prevent the two plates from moving away from each other when the quick release device is inadvertently released.

Abstract: A hinge for a foldable bicycle includes a first plate and a second plate each having a side pivotally attached to each other. A quick release device is mounted on one of the two plates to hold the other plate in place when the two plates abut each other. The hinge for a foldable bicycle includes a lock bolt movably mounted in one of the two plates and a hole defined in the other plate. The lock bolt is inserted into the hole after the two plates abutting each other to prevent the two plates from moving away from each other when the quick release device is inadvertently released.

Abstract: A bike handle tightening device after separated from a bike frame includes a fix tube fixed on a bike frame and having a hollow interior, a vertical rod of a handle, a threaded rod inserting in the vertical rod from top and having a lower end protruding out of the vertical rod, and a tightening member screwing with the threaded rod and having a sloped end surface- The vertical rod and the tightening member are inserted in the fix tube, and the threaded rod is rotated to force the tightening member to move nearer to and contact and rotate along a sloped bottom end surface of the vertical rod so as to let the axis of the vertical rod and the tightening member move away from each other so that the vertical rod and the tightening member push against opposite portions of an inner wall of the fix tube to tighten the handle therein, reducing the size of the bike collapsed for convenience of transporting and storing and helping stabilize the bike after collapsed.

Abstract: A waist-twisting leisure bike includes a front body frame, a rear body frame, and a lateral frame. The front body frame has a handle, a support rod, a front fork tube, a front fork base, a front fork and a front wheel. The rear body frame has a driving device, a seat and a rear wheel. The lateral frame consists of a first and a second lateral frame respectively connected to the front body frame and the rear body frame. The first and the second lateral frame are pivotally connected to each other. Then a rider can twist the waist for changing swaying angle of the first and the second lateral frame so as to change the moving direction of the bike. So the bike in the invention can move by pedaling but also be used for waist-twisting exercise as well.

Abstract: A waist-twisting leisure bike includes a front body frame, a rear body frame, and a lateral frame. The front body frame has a handle, a support rod, a front fork tube, a front fork base, a front fork and a front wheel. The rear body frame has a driving device, a seat and a rear wheel. The lateral frame consists of a first and a second lateral frame respectively connected to the front body frame and the rear body frame. The first and the second lateral frame are pivotally connected to each other. Then a rider can twist the waist for changing swaying angle of the first and the second lateral frame so as to change the moving direction of the bike. So the bike in the invention can move by pedaling but also be used for waist-twisting exercise as well.

Abstract: A collapsible bicycle includes a body frame including a front wheel rotatably mounted on a first end portion thereof, and a seat tube fixedly mounted on a second end portion thereof. A rear frame includes an upright tube disposed beneath the seat tube, a pair of seat stays each extending from the upright tube, a rear wheel rotatably mounted between the pair of seat stays, and a pair of supporting brackets each having a first end portion fixedly mounted on a corresponding one of the pair of seat stays and a second end portion located at a position flush with the rear wheel. A pivot mechanism is pivotally connected between the seat tube and the upright tube such that the upright tube can be pivoted relative to the seat tube, thereby pivoting the rear frame toward the front wheel of the body frame to a position where the second end portion of each of the two supporting brackets together with the rear wheel can be supported on the ground synchronously.