Abstract: 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.

Abstract: A skate includes a skate boot and wheel assembly; an outer seat disposed on the skate boot and wheel assembly; an inner seat disposed in the outer seat; a tongue disposed on the inner seat; a cover disposed on the tongue; a first hole disposed in a toe portion of the outer seat; a second hole disposed in front of the first hole; a biasing member disposed in both the first and second holes; two projections having a through hole disposed on a front end of the cover; and a pivot disposed through the through holes and the biasing member to assemble the cover and the outer seat. Thus, the tongue is pivotal.

Abstract: A skate includes a body including a toe having a projection on a first side and a cavity on an opposing second side; and a replaceable bar having a through hole on a first side and a protrusion on a second side; and a plurality of wheels rotatably mounted on an underside of the body. The projection is inserted through the through hole and the protrusion is inserted into the cavity, thereby assembling the replaceable bar and the toe.

Abstract: A ventilating inline skate includes an inner vamp formed of EVA copolymer and including a plurality of holes and a plurality of air-exit ports; an outer vamp formed of EVA copolymer and including a plurality of air-exit ports; a tongue formed of EVA copolymer; a frame secured to the outer vamp; a heel cap secured to the frame; and a plurality of wheels mounted in line under the frame. The inner vamp is disposed in the outer vamp with the air-exit ports of the inner vamp aligned with the air-exit ports of the outer vamp.

Abstract: An adjustable roller skate is provided with a lower frame including a toe stop; a wheel assembly secured to the lower frame; an upper frame including a groove, a trough disposed rearward of the groove, a channel at a rear end, and a seat disposed in the trough and having a recess communicating with the channel; an adjustment mechanism including an externally threaded shaft disposed in both the channel and the recess, and a handle pivotably secured to a rear end of the externally threaded shaft and disposed externally of the upper frame; a sole including a toe cap, an internally threaded member on an underside of a rear end and threadedly secured to the externally threaded shaft, and a stem on the underside and slidably disposed in the groove; and a shoe disposed around an edge of the sole with the toe cap concealed.

Abstract: An adjustable roller skate is provided with a lower frame including a toe stop; a wheel assembly secured to the lower frame; an upper frame including a groove, a trough disposed rearward of the groove, a channel at a rear end, and a seat disposed in the trough and having a recess communicating with the channel; an adjustment mechanism including an externally threaded shaft disposed in both the channel and the recess, and a handle pivotably secured to a rear end of the externally threaded shaft and disposed externally of the upper frame; a sole including a toe cap, an internally threaded member on an underside of a rear end and threadedly secured to the externally threaded shaft, and a stem on the underside and slidably disposed in the groove; and a shoe disposed around an edge of the sole with the toe cap concealed.

Abstract: A pivot angle setting mechanism of a steering bar of a push scooter is described and includes a mount secured to a front end of the push scooter, the mount including a central hole and two openings each between the central hole and either end, each opening having two parallel projections; two sliding members each including a cavity on one end, three parallel grooves on the other end wherein two of the grooves complimentarily engage the projections respectively, and a channel communicating the cavity with a central one of the grooves; two limit members each including a concave surface and a hollow peg in the opening; and two spring biased pins each disposed in the cavity and having a shank fastened in the hollow peg by passing through the channel.

Abstract: A kick scooter includes a steering tube; a deck including a support tube on a top at a front end, the support tube being pivotably secured to the steering tube, two bossed holes on an underside, two through holes in front of the bossed holes, a recess at the front end, and a mounting member disposed in the recess; an axle secured to the steering tube through the mounting member; a rear wheel rotatably connected to the deck; two front wheels rotatably connected to two ends of the axle respectively; and a protective cover including two first bossed holes on an underside and releasably secured to the bossed holes of the deck, two second bossed holes on the underside and releasably secured to the through holes of the deck, and a through hole with the support tube secured thereto. The protective cover is replaceable.

Abstract: A pivot angle setting mechanism of a steering bar of a push scooter is described and includes a mount secured to a front end of the push scooter, the mount including a central hole and two openings each between the central hole and either end, each opening having two parallel projections; two sliding members each including a cavity on one end, three parallel grooves on the other end wherein two of the grooves complimentarily engage the projections respectively, and a channel communicating the cavity with a central one of the grooves; two limit members each including a concave surface and a hollow peg in the opening; and two spring biased pins each disposed in the cavity and having a shank fastened in the hollow peg by passing through the channel.

Abstract: A kick scooter includes a steering tube; a deck including a support tube on a top at a front end, the support tube being pivotably secured to the steering tube, two bossed holes on an underside, two through holes in front of the bossed holes, a recess at the front end, and a mounting member disposed in the recess; an axle secured to the steering tube through the mounting member; a rear wheel rotatably connected to the deck; two front wheels rotatably connected to two ends of the axle respectively; and a protective cover including two first bossed holes on an underside and releasably secured to the bossed holes of the deck, two second bossed holes on the underside and releasably secured to the through holes of the deck, and a through hole with the support tube secured thereto. The protective cover is replaceable.

Abstract: An inline skate is provided with a boot including a sole; a frame; a closure member; wheels arranged in a straight line on a bottom of the frame; two opposite male sockets disposed on both sides of a rear portion of the frame respectively, each male socket including a rear aperture; two side wheel assemblies each including a wheel mount, a wheel member in the wheel mount, and a female socket extending out of the wheel mount to complimentarily dispose in the male socket and having a rear aperture member; and two spring depressible detents mounted in the female sockets respectively and each including a ball at an end. In a locked position, the ball protrudes out of the aperture member to partially pass through the aperture.

Abstract: A safe roller shoe structure contains a body and a base, the base includes four rollers, characterized in that a pedal is lower than an upper periphery of each roller to lower a gravity center of legs in exercise; the pedal includes the four seats four integrally formed and extending from two sides thereof to correspond to the four rollers.

Abstract: A scooter includes a main frame, a head tube mounted on the main frame, two side plates extending from the head tube and each having a first locking slot and a second locking slot, a handlebar stem mounted on the head tube, a mounting sleeve mounted on the handlebar stem, a locking tube movably mounted on the mounting sleeve and having two locking blocks each locked in the first locking slot or the second locking slot of the respective side plate, and a rotation tube mounted on the mounting sleeve and abutting the locking tube. Thus, the rotation tube can be rotated to move the locking tube relative to the head tube so as to lock or unlock the handlebar stem so that the user only needs to rotate the rotation tube to expand and collapse the handlebar stem easily and quickly.