A ground-engaging device that is capable of sustained rolling, stable braking, secure standing, and walking. In one preferred embodiment, the invention relates to a wheeled footwear device. In another preferred embodiment, the invention relates to a wheeled footwear platform. In yet another preferred embodiment, the invention relates to a wheeled artificial foot.

A roller blade ice wheel assembly for using roller blades on ice includes a plurality of blade wheel apparatuses each comprising a wheel body having a central wheel aperture, a pair of wheel sidewalls, and a wheel edge. The wheel edge is less than 0.5 cm. At least one bearing is coupled to the wheel body. The bearing receives an axle of a roller blade through a bearing aperture and the wheel aperture. Each of a plurality of spacers has a central spacer aperture to receive the axle of the roller blade. The plurality of spacers is positioned on both sides of the bearing to occupy space up to a wheel frame of the roller blade. The width of the blade wheel apparatus is dimensioned to equal the width of a wheel of the roller blade that is being replaced.

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.

A multi-link wheel base includes a main body composed of a plurality of links connected in series and wheels provided on the main body, and the wheels are provided on the link assembly the link assembly includes an intermediate link and an end link, wherein both sides of the intermediate link are provided with a rotational connection position, one side of the end link is provided with a rotational connection position, and the rotational connection positions on the adjacent link assemblies are rotationally connected by means of a connecting device.

The present steerable wheel assembly incorporates a lean-to-steer mechanism into an inner race of a roller bearing, while a wheel is mounted to an outer race of the roller bearing. A shaft extending from the mechanism is attached to a body, and the mechanism acts to steer the outer race and the wheel about a vertical steering axis when the shaft is tilted about a horizontal axis. The mechanism can be a pivot joint, providing a linear steering response, or can be a lean-to-steer mechanism that provides a non-linear response where the steering action is not proportionally responsive to tilting over the expected range of tilting.

A motorized vehicle assembly includes an axle comprising a channel extending along a central axis of the axle, a socket positioned within the channel of the axle, and a motorized wheel configured to be mounted on an end the axle. The motorized wheel includes a boss configured to engage the end of the axle when the motorized wheel is mounted on the axle, an electric motor, a tire mounted on the rotor, and a plug positioned within the boss, the plug configured to engage with the socket when the motorized wheel is mounted on the axle. The electric motor includes a stator fixed to the boss and a rotor surrounding the stator, the rotor configured to rotate relative to the stator. The electric motor is configured to cause the rotor to rotate relative to the stator to cause the tire to rotate.

An aluminum or aluminum alloy wheel hub having at least one display opening for electrically operated display device and at least one interior channel anodized to a sufficient electrically insulative thickness, the channel is dimensioned to receive at least one electrically conductive element of a compact generator. The display device can be a LED device. The wheel hub is especially suited for roller skate, in-line skate, and skate board wheels.

The present steerable wheel assembly incorporates a lean-to-steer mechanism into an inner race of a roller bearing, while a wheel is mounted to an outer race of the roller bearing. A shaft extending from the mechanism is attached to a body, and the mechanism acts to steer the outer race and the wheel about a vertical steering axis when the shaft is tilted about a horizontal axis. The mechanism can be a pivot joint, providing a linear steering response, or can be a lean-to-steer mechanism that provides a non-linear response where the steering action is not consistently responsive to tilting over the expected range of tilting. The present non-linear lean-to-steer mechanisms can also be incorporated into alternative lean-to-steer devices, and alternative mechanisms can employ tracking structures to coordinate tilting motion of a first moving element with steering motion of a second moving element to provide a non-linear lean-to-steer response.

A multi-link wheel base includes a main body composed of a plurality of links connected in series and wheels provided on the main body, and the wheels are provided on the link assembly the link assembly includes an intermediate link and an end link, wherein both sides of the intermediate link are provided with a rotational connection position, one side of the end link is provided with a rotational connection position, and the rotational connection positions on the adjacent link assemblies are rotationally connected by means of a connecting device.

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.