The present invention is directed to devices for protection of the bottom center portion of skateboard platforms when used obliquely on upstanding structural edges, as when grinding. A roller assembly of the present invention may have an elongated bearing shaft rotatably positioned at each end in spaced apart bearings that are attached to the bottom surface of a skateboard platform. Optional variations and surface treatments of the bearing shaft are also disclosed.

A wheel includes a primary ring having a stepped core part and a tire formed of a urethane material as an outer surface thereof, and an auxiliary ring provided on a circumferentially-central portion of the primary ring, on which the tire is provided, in an insertion manner. The primary ring is formed of a plastic material, and the auxiliary ring is formed of a metallic material that is different from the material of the primary ring.

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 inner race of the first bearing being laterally spaced apart from an opposing inner race of the second bearing so as to form a bearing gap therebetween. A first outer spacer is positionable in contact with an outer race of the first bearing, and a second outer spacer is positionable in contact with an outer race 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.

An inline wheeled truck is a structural arrangement for wheels on a skating device. The inline wheeled truck includes a first wheel, a second wheel, a left elongated bracket, a right elongated bracket, a cross platform, a base platform, a first support member, and a second support member. The first wheel and the second wheel allows the inline wheeled truck to roll in a forward direction and a backward direction. The left elongated bracket and the right elongated bracket evenly space and structurally secure the first wheel and the second wheel. The cross platform structurally bridges the left elongated bracket and the right elongated bracket. The first support member and the second support member are connected in between the cross platform and the base platform and convert a tilting motion of the base platform into a steering motion of the cross platform.

A wearable motorized device comprising a shoe bracket, which can be fastened to a shoe; wheels that are installed on the left and right sides of the shoe bracket in parallel to support the wearer's lateral skating and longitudinal walking; a driving motor for rotationally driving the wheels; and a battery pack for powering 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 instead are installed on the two sides of the shoe bracket in parallel to drive the wearer's lateral skating; the wearer can position his/her legs apart during skating, so the skating stability is improved. Its general contour does not significantly exceed the contour of the shoe in the longitudinal direction, thus and it will not strain the wearer when ascending or descending stairs.

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.

An apparatus comprising a platform; a plurality of trucks coupled to the platform; and a roller assembly coupled to the platform, wherein the roller assembly is configured for an omnidirectional rotation, wherein the roller assembly is configured for an elastic biasing, wherein the roller assembly is driven by a motor.

A wearable device configured to selectively provide roller transportation, the wearable device including a shoe, a plurality of wheel assemblies, each wheel assembly being configured to selectively roll relative to a ground surface about an associated axis of rotation, and a frame connected between the wheel assemblies, the frame comprising a trunk and a plurality of branches extending from the trunk, each of the branches being configured for connection to at least one of the plurality of wheel assemblies, wherein at least a portion of the shoe is located vertically higher than at least a portion of the frame when at least one of the wheel assemblies is in contact with the ground surface and the at least one of the wheel assemblies is positioned to selectively roll relative to the ground surface.

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.