Abstract: A skateboard includes a board adapted for a user to stand with both feet thereon and having a major axis, and a front steering device and a rear steering device respectively disposed on front and rear sections of a bottom surface of the board along the major axis and each having two wheels. The front or rear steering device has a wheel seat disposed on the bottom surface of the board rotatably around a rotation axis which inclines downwards from front to rear, and a wheel rack disposed on the wheel seat rotatably or swingably around a main axis. An abutted surface is defined where the wheel seat and the wheel rack are abutted against each other. On an imaginary vertical plane including the major axis, where the rotation axis passes the abutted surface is in front of where the main axis passes the abutted surface.

Abstract: A pneumatic and hydraulic elevating seat tube assembly of a bicycle includes an outer tube and a movable inner tube in the outer tube. An elevating adjustment unit in the movable inner tube has a fixed inner tube in the movable inner tube, a fixed piston in the fixed inner tube, a floating piston in the fixed inner tube, and an elastic isolator in the floating piston which is between a bottom end of the movable inner tube and the fixed piston so that a gas chamber is formed between the floating piston and the movable inner tube and a lower oil chamber is formed between the floating piston and the fixed piston. The elastic isolator has first and second annular grooves facing toward the lower oil chamber and the gas chamber respectively. The elastic isolator under pressure is extended radially, thereby effective in isolating oil from gas positively.

Abstract: A three-piece stem of a bicycle includes a stem body, a bottom pipe, and a middle element. A first torus portion and a second torus portion are disposed at two ends of the stem body, respectively. The bottom pipe is disposed in the second torus portion of the stem body. The middle element is disposed between the second torus portion of the stem body and the bottom pipe. A connecting element couples the second torus portion of the stem body, the bottom pipe, and the middle element together, such that the second torus portion of the stem body, the bottom pipe, and the middle element are fixed tightly to a front forked upright pipe collectively, thereby enhancing the ease of assembly and the binding strength upon completion of assembly.

Abstract: A bicycle gear shift control system capable of avoiding frequent gear shifting includes: a power module; a microcomputer electrically connected to the power module for allowing a cyclist to switch between the automatic gear shifting mode and a manual gear shifting mode; a gear shifting driver electrically connected to the microcomputer, substantially connected to a derailleur, and instructed by the microcomputer to drive the derailleur to perform gear shift control; and a manual shifting controller electrically connected to the microcomputer. The microcomputer has an automatic gear shifting logic whereby the microcomputer determines the timing of automatic gear shifting and performs gear shifting. The microcomputer further has a gear shifting delay logic that involves delaying for a delay time interval from commencement of gear shifting according to a gear shifting criterion and ruling out all other gear shifting commands during the delay time interval.

Abstract: An automatic gear-shifting bicycle includes: a bicycle body provided with two cranks, two pedals and a derailleur, a power supply module, a microcomputer, a gear shifting control driver, and a pedal position sensor module installed in the bicycle body corresponding to the cranks and electrically coupled to the microcomputer for enabling the microcomputer to determine the angular position and forward/backward pedaling of the cranks. The microcomputer calculates the optimal shift timing subject to the time point the crank to be moved over the pedaling dead point in the next time, the pedaling speed to be below a predetermined speed value or the cranks are been pedaling backwardly.

Abstract: A power-assisted bicycle includes a bicycle body with a power assistance provider and a derailleur, a microcomputer, a gear-shift control driver, and sensors. When the microcomputer decides to perform gear shifting, it controls the power assistance provider to provide an assistant power output and the gear-shift control driver to drive the derailleur to shift gears properly subject to a before-shifting time period, an in-shifting time period and an after-shifting time period. Further, the microcomputer controls the power assistance provider to change the current assistant power to a predetermined low assistant power during the before-shifting time period, or to maintain the predetermined low assistant power during the in-shifting time period, or to change the assistant power output to a level higher than the current assistant power and then to return to the said current assistant power after the end of the after-shifting time period.

Abstract: An electric kick scooter including a scooter body, a drive device and a strain gauge is provided. The scooter body has a foot plate, a steering tube and a rear wheel respectively provided at front and rear ends of the foot plate, and a handle bar and a front wheel respectively provided at top and bottom ends of the steering tube. The drive device has a motor installed in the front wheel or rear wheel, and a battery installed with the scooter body and electrically connected to the motor. The strain gauge is attached to the steering tube or handle bar of the scooter body to sense the strain generated on the steering tube or handle bar when it receives a force. The strain signal of the strain gauge is transmitted to a controller for enabling the controller to control an action of the motor accordingly.

Abstract: A shift control system working with a power-assisted bicycle that has an assisting-power supplying system and a derailleur. The shift control system includes a microcomputer in which plural shifting condition tables are stored. The assisting-power supplying system provides at least two different assisting modes. The shift control system also includes a shifting driver and at least one sensor for sensing at least one of a wheel speed, a crank speed, a pedaling force and a road gradient so as to generate at least one sensing signal and obtain at least one sensing result. The microcomputer selects one of the shifting condition tables in accordance with the current assisting mode for comparing the sensing result, thereby determining whether upshifting or downshifting is to be conducted. Then the microcomputer controls the shifting driver to send a shift control signal to make the derailleur upshift or downshift.

Abstract: A power-assisted system is to be assembled to a derailleur-equipped bicycle for providing an auxiliary force to the bicycle. The power-assisted system includes: a microcomputer; a pedaling-rate sensor; a bicycle-speed sensor; a shift-position source; and an auxiliary-force database including data about at least a pedaling rate, a running speed, a current gear ratio and the auxiliary force, for defining a ratio between the running speed and the current gear ratio as a first comparison value, and defining the pedaling rate as a second comparison value wherein an auxiliary-force comparison table is made of levels of the auxiliary force to be output corresponding to the first and second comparison values. The microcomputer uses a determining logic circuit to determine the suitable level of the auxiliary force to be output and control the auxiliary-force providing device to output the auxiliary force in the determined level.

Abstract: A bicycle battery connection system includes a battery data determination circuit, a battery data processing circuit and an adapter. The battery data determination circuit is electrically connected to one of the first-type battery having an MCU and a second-type battery without an MCU through the adapter for enabling battery data of the connected battery to be processed by the battery data processing circuit and outputted as battery status for display on a display device in front of the user and for further battery output control. Thus, either a first-type battery or a second-type battery can be used and detected for automatic matching, and therefore the battery connection system allows a bicycle to use any of different types of batteries.

Abstract: A combination vehicle frame includes a base frame unit formed of a plurality of frame bars detachably connected to one another. One of the frame bars is provided with a head having intersected first through hole and second through hole. A rear wheel frame unit is detachably connected to the base frame unit remote from the head. A front wheel frame unit is selectively inserted through one of the first through hole and second through hole of the base frame unit.

Abstract: A device includes a first movable member having at least a slot on an inner wall thereof; a second movable member provided in the first movable member; a sliding sleeve, which has at least a recess, provided between the first movable member and the second movable member; and at least a rolling member received in the recess of the sliding sleeve and contacting an inner wall of the slot of the first movable member and an outer wall of the second movable member. Whereby, the second movable can not rotate relative to the first movable member and only can move relative to the first movable member.

Abstract: A combination vehicle frame includes a base frame unit formed of a plurality of frame bars detachably connected to one another. One of the frame bars is provided with a head having intersected first through hole and second through hole. A rear wheel frame unit is detachably connected to the base frame unit remote from the head. A front wheel frame unit is selectively inserted through one of the first through hole and second through hole of the base frame unit.