The present invention discloses a flat ground cross-country type roller skate comprising a skate body (1), wherein a wheel assembly at a lower part of the skate body, wherein the wheel assembly comprises a mourning seat (6) used to mount the skate body (1) and a hoisting mechanism disposed on the mounting seat (6). There are at least three wheel assemblies disposed on the hoisting mechanism, and each wheel assembly can hoist independently under the action of the hoisting mechanism. Thus, the wheel assemblies of the roller skate can be hoisted independently so as to adapt to various roads with uneven surface.

The invention relates to a drive system for a vehicle drivable by muscle force, in particular for a skateboard, said drive system comprising at least one axle and at least one wheel (1) which has an electric motor (10), wherein the electric motor (10) comprises a stator (11), which can be connected to the axle, and a rotor (12) which is rotatable about the stator. The invention is characterised in that the wheel (1) has a roller (20) which forms a running surface (24), wherein the roller (20) is or can be replaceably connected to the rotor (12). The invention further relates to a method for changing a roller (20) of such a drive system and to a production method.

A spring lock for a skate wheel includes a housing including opposite first and second holes, and a third hole; a pin through the first and second holes and including first and second grooves; a button on the third hole; a back plate on a back of the housing; a first biasing member secured to the back plate; a stop member secured to the first groove; a sliding member having one end urging against the first biasing member and the other end contacting the button to slidably dispose on the second groove, the sliding member including small and large holes; and a second biasing member on the pin and having one end urging against an inner surface of the housing and the other end urging against the stop member. In a locked state, the pin extends into an elongated hole of between two spokes of the wheel.

A roller board is a board that uses wheels, caster balls, and cleats to mimic the movement of a snowboard. The roller board includes a riding board, a front roller mechanism, and a rear roller mechanism. A user stands upon the riding board and is secured to the riding board. The front roller mechanism and the rear roller mechanism each include an inline-wheeled truck, left and right caster balls, and left and right elongated cleats. The inline-wheel truck allows the roller board to roll in a forward or rearward direction. The left and right caster balls allow a light left or right lean by the user to steer the riding board in either a left or right direction. The left and right elongated cleats allow a heavy left or right lean by the user to brake the riding board from a left or right side of the riding board.

A wheel assembly apparatus is disclosed. In at least one embodiment, a wheel hub is coaxially positionable within a wheel. A first bearing and a laterally opposed second bearing are each positionable coaxially within the wheel hub, with an inwardly facing medial surface of the first bearing being laterally spaced apart from an opposing inwardly facing medial surface of the second bearing so as to form a bearing gap therebetween. A first outer spacer is positionable in contact with an outwardly facing lateral surface of the first bearing, and a second outer spacer is positionable in contact with an outwardly facing lateral surface of the second bearing. Accordingly, an axle is capable of extending coaxially through each of the first outer spacer, first bearing, second bearing, second outer spacer, wheel hub and wheel, thereby enabling the wheel to rotate about the axle.

A caster board can include a front platform, a rear platform, and at least two neck sections extending between the front platform and the rear platform. The neck sections can serve as a torsion element allowing twisting of the front platform relative to the rear platform. An aperture between the neck sections can be configured to receive an insert. The insert can alter a structural characteristic of the caster board, such as the torsional stiffness of the caster board.

An apertured article, insertion article and associated systems. The apertured article having an aperture, which has an aperture periphery, the aperture periphery having an aperture inner periphery and spaced aperture protrusions that extend radially outwardly from the aperture inner periphery to an aperture outer periphery. The aperture outer periphery is defined by distal edges of the spaced aperture protrusions. The aperture inner periphery is positioned along the circumference of an inner aperture reference circle, the inner aperture reference circle inscribing the aperture periphery, and the aperture outer periphery is positioned along the circumference of an outer aperture reference circle. As viewed along a radial line whose origin is at the center of the inner aperture reference circle, the aperture inner periphery can be positioned along 0.4 to 0.6 of the entire circumference of the inner aperture reference circle. The insertion article can be configured for insertion in the apertured article.

An electric vehicle may comprise a board including first and second deck portions each configured to receive a left or right foot of a ride, a wheel assembly disposed between the deck portions and including a ground-contacting element, a motor assembly mounted to the board and configured to rotate the ground-contacting element around an axle to propel the electric vehicle, at least one sensor configured to measure orientation information of the board, and a motor controller configured to receive orientation information measured by the sensor and to cause the motor assembly to propel the electric vehicle based on the orientation information. The electric vehicle may include exactly one ground-contacting element, and the motor may be a hub motor.

A wheel for a skateboard may include a bearing assembly, an annular rim coupled to and extending annularly around the bearing assembly, and a tapered tire portion coupled to and extending annularly around the annular rim. A dual wheel assembly may include a first wheel disposed on a longitudinal end portion of an axle, a spacer disposed on the longitudinal end portion of the axle adjacent to the first wheel and abutting against the first wheel, and a second wheel disposed on the longitudinal end portion of the axle adjacent to the spacer and abutting against the spacer. A method of making a dual wheel assembly may include disposing a first wheel on an axle, disposing a spacer on the axle adjacent to the first wheel, and disposing a second wheel on the axle adjacent to the spacer.

The present invention refers to a roller skate with a single wheel comprising a wheel (2110, 2120); a connection means (230) configured so as to allow the connection of a shoe (S); characterized in that the wheel is made up of a first circular element (2110) and a second circular element (2120), inside the first circular element, between which a rolling element (2130) is arranged, configured so as to facilitate the relative movement of the first circular element (2110) with respect to the second circular element (2120); and in that the connection means (230) is connected to the second circular element (2120) and is configured so as to position the shoe (S) at least partially inside the first circular element, preferably in an orientable manner according to any direction with respect to the second circular element (2120).