Abstract: A foldable bicycle includes a front frame, a rear frame, two seat plates, a middle frame, a seat post, and a handlebar unit. Thus, when the bicycle is folded, the front frame, the middle frame and the rear frame are parallel with other, and the handlebar unit is folded, so that the parts of the bicycle are fully folded to reduce the volume largely, thereby greatly saving the space of storage and transportation, and thereby facilitating a user carrying the bicycle.

Abstract: A foldable bicycle includes a front frame, a rear frame, two seat plates, a middle frame, a seat post, and a handlebar unit. Thus, when the bicycle is folded, the front frame, the middle frame and the rear frame are parallel with other, and the handlebar unit is folded, so that the parts of the bicycle are fully folded to reduce the volume largely, thereby greatly saving the space of storage and transportation, and thereby facilitating a user carrying the bicycle.

Abstract: A stroller includes a main frame, a linkage, a support unit, and a shock-absorbing device. Thus, the front wheels of the stroller can be turned rightward and leftward stably and smoothly. In addition, the front wheels of the stroller are turned easily and conveniently, thereby facilitating the user operating the stroller. Further, the stroller has a shock-absorbing effect.

Abstract: A stroller includes a main frame, a linkage, a support unit, and a shock-absorbing device. Thus, the front wheels of the stroller can be turned rightward and leftward stably and smoothly. In addition, the front wheels of the stroller is turned easily and conveniently, thereby saving the manual work, and thereby facilitating the user operating the stroller. Further, the stroller has a shock-absorbing effect.

Abstract: A padlock and lock holder unit including a padlock having a buzzer alarm circuit controlled by a pressed button to give an audio alarm signal when the padlock is attacked, and a lock holder consisting of a fixed clamping frame fixedly fastened to the bicycle frame, and a holder frame turned about a screw bolt on the fixed clamping frame and fixed in the desired angular position by a locknut for carrying the padlock when the padlock is not in use.

Abstract: A bicycle lamp device including a lamp body. A lamp mount for fastening to the bicycle frame. A connecting member for fastening the lamp body to the lamp mount, and a circuit board installed in the lamp body and controlled by a charge coupled device to give light when the intensity of outside light drops below a predetermined value. The lamp body being turned about a coupling disc at one end of the connecting member and then fixed in position by a projecting block on the coupling disc. The lamp mount consisting of a mounting frame fixed to the bicycle frame and coupling frame turned about a screw bolt on the mounting frame and fixed in position by a nut to hold the lamp body.