The present utility model discloses a roller skate. The rollers are divided into the front roller group and the rear roller group, and the rear roller group is rotatably disposed at the bottom of the skate body through the reversing mechanism, so that switching of the rear roller group between line arrangement and row arrangement is realized, the scope of application of the roller skate is effectively extended, and the roller skate has higher practicability.

A skate includes an inverted groove-shaped base secured to a boot and including front and rear pins; an elongated frame including front and rear sets of a transverse inner groove and a transverse open groove communicating with the transverse inner groove, and a threaded hole on the transverse open groove of the front set wherein either pin is disposed in the transverse inner groove and the elongated frame abuts an underside of the base; and a locking device including a spring biased block member disposed in the transverse open groove of the front set and having two projections at two ends respectively, a screw driven through a positioning member into the threaded hole to fasten the positioning member in the transverse open groove of the front set so that the block member abuts the front pin to block same in an assembled state.

In a preferred embodiment a wheeled platform apparatus and method for use in rolling on a surface are provided. The apparatus includes a platform having a top surface, a bottom surface, a front portion, a center portion, a rear portion, and a first wheel and a second wheel that interface with or are positioned below the bottom surface of the platform to facilitate rolling movement of the platform. The apparatus may further include an attachment device interfacing with the top surface and the footwear, as well as a footrest to support the forefoot of another foot, or footwear.

A sport board or freestyle skateboard which may include at least a central aluminum honeycomb portion between layers of carbon nanotube fiber, fiberglass cloth, and covered with a soft outer layer.

An inline skate includes a skate boot; a front wheel mount secured to a front portion of a bottom of the skate boot; a front wheel rotatably secured to the front wheel mount; a rear wheel mount secured to a rear portion of the bottom of the skate boot; a rear wheel rotatably secured to the rear wheel mount; and two adjustable shock absorbers disposed between the front wheel mount and the rear wheel mount.

A sport board or freestyle skateboard which may include at least a central aluminum honeycomb portion between layers of carbon nanotube fiber, fiberglass cloth, and covered with a soft outer layer.

Provided is a ball skate sole structure which can be customized for each individual or each sport. This ball skate sole structure includes: a base plate having a plurality of first holes and a plurality of second holes; at least one ball roller member, the at least one ball roller member being disposed in the first hole selected from among the plurality of first holes; and at least one brake member, the at least one brake member being disposed in the second hole selected from among the plurality of second holes.

A bottom structure of a roller skate includes a sole; a frame secured to the sole and including front and rear supports and two hubs disposed on the front and rear supports respectively; a pivotal member disposed in the hub; two spaced sleeves disposed in the hub wherein the sleeves are further partially disposed in the pivotal member and secured to the pivotal member; a shaft passing through the hub, the pivotal member, and a gap between the sleeves, and rigidly secured to the pivotal member; and two enlargements disposed at two ends of the shaft respectively.

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 wearable mobility device is provided. The wearable mobility device may include a base configured to support a rear portion of a shoe or foot, wherein a front portion of the shoe is free to touch a surface, and wherein the base enables a wearer of the shoe to walk upon the surface when the device is worn by the wearer; two side wheels disposed on opposite sides of the base; a rear wheel disposed at the rear of the base; wherein the wheels enable the wearer to roll upon the surface; and a motor mechanically coupled to at least one of the wheels.