A wearable motorized device comprising a shoe bracket, which has a ring-shaped structure and can be fastened to the middle part of a shoe; a wheel, which rotatably supports the shoe bracket to enable lateral skating and longitudinal walking; a driving motor, which rotationally drives the wheel; and a battery pack, which powers the driving motor. The wheels are not coaxially installed on the two sides of the shoe bracket to drive the wearer's longitudinal skating, but are installed on the ring-shaped shoe bracket, which can be fastened to the middle part of the shoe, to support the wearer's lateral skating and longitudinal walking. This way, the wearer can position his/her legs apart during skating; such that the skating stability is improved. Moreover, its general contour does not significantly exceed the contour of the shoe in the longitudinal direction, thus it will not strain the wearer when ascending or descending stairs. Therefore, a wearable motorized device with high skating stability and ease of use can be achieved.

An apparatus for automatically adjusting tension on retention member to hold multiple objects together. Examples include using retention apparatus to obtain optimal fit and use of a human wearable item such as article of footwear. Sensors may be used to sense changes in movement of the article of footwear, of the person wearing it, or of a third object such as a vehicle carrying the person. A retention member may surround at least a portion of the objects, and an actuator may be included that automatically rotates a rotating member such as a gear or pulley that may be coupled to the retention member. The rotating member may be configured to automatically adjust tension on the retention member many times per second based on control signals from control logic responsive to the sensors.

An adjustment mechanism for an electric power-driven shoe, the mechanism comprising a shoe sole (1) is presented, wherein a plurality of rolling wheels (2) are arranged below the shoe sole (1); a foot-positioning mechanism is arranged above the shoe sole (1) and is provided with an angle-adjusting mechanism for adjusting an angle between the foot-positioning mechanism and a lengthwise direction of the shoe sole (1).

An adjustment mechanism for an electric power-driven shoe, the mechanism comprising a shoe sole (1) is presented, wherein a plurality of rolling wheels (2) are arranged below the shoe sole (1); a foot-positioning mechanism is arranged above the shoe sole (1) and is provided with an angle-adjusting mechanism for adjusting an angle between the foot-positioning mechanism and a lengthwise direction of the shoe sole (1).

One embodiment of a skateboarding balance device where an elongated structure (10) has four straps (16L, 16R) disposed thereunder said structure. This pad (10) is composed of flexible material. The straps (16L, 16R) provide for a method of securely attaching said pad (10) to a skateboard (SK1) by means of velcro (20L, 18R). The straps are made of material with elasticity.

One embodiment of a skateboarding balance device where an elongated structure (10) has four straps (16L, 16R) disposed thereunder said structure. This pad (10) is composed of flexible material. The straps (16L, 16R) provide for a method of securely attaching said pad (10) to a skateboard (SK1) by means of velcro (20L, 18R). The straps are made of material with elasticity.

A roller board has axles provided with castors and secured at the front and rear ends of a board deck such that a steering movement is transferrable to the axles by a person on the board deck by lateral shifting of weight. Steerability and problem-free operation are improved. Substantially rigid booms, one directed to the front and one directed to the rear, are provided at the front and rear ends of the board deck, respectively. A support arm pointing in the direction of the central axis of the board deck is rigidly fastened to each boom. The support arms are pivotable on the two sides about a pivot axis inclined in the direction of travel by 40° to 50° relative to the plane of the board deck. The axle of a single castor is mounted rotatably in or on each hub, with the pivot joint inside the castor.

The present disclosure provides a detachable training wheel apparatus for mounting to the underside of a skateboard tail or nose to assist with balancing a user during manoeuvres which require tipping of the skateboard onto two wheels, while allowing the board to continue rolling along the ground with minimal friction. The apparatus comprises a single wheel mounted to a mounting board by a pair of supports and a central bushing, with the opposing side of the mounting board having a flat surface provided with attachment means for detachably coupling to the skateboard underside, such as a hook and loop surface.

A portable energy-saving and environment-friendly electric vehicle is light in weight, small in volume, convenient in electricity charging, and disassemble to be collected into a backpack for portability. The backpack is further furnished with a crank-handle generator to fulfill manpower electricity generation and working out simultaneously. This energy-saving and environment-friendly electric vehicle is mainly consisted of two adjustable skateboards and a support rod for adjusting speed and connecting a battery set. The battery set can be conveniently replaced roadside or domestically. In a situation of power out, manpower can be used to charge the battery set. Thus, the situation of power out to shut down the electric vehicle can be met. In addition, the battery set associated with the generator is reliable for charging mobile phones and computers.

A portable energy-saving and environment-friendly electric vehicle is light in weight, small in volume, convenient in electricity charging, and disassemble to be collected into a backpack for portability. The backpack is further furnished with a crank-handle generator to fulfill manpower electricity generation and working out simultaneously. This energy-saving and environment-friendly electric vehicle is mainly consisted of two adjustable skateboards and a support rod for adjusting speed and connecting a battery set. The battery set can be conveniently replaced roadside or domestically. In a situation of power out, manpower can be used to charge the battery set. Thus, the situation of power out to shut down the electric vehicle can be met. In addition, the battery set associated with the generator is reliable for charging mobile phones and computers.