Abstract: A detachable frame device includes: a rack device having a plurality of wheels linearly detachably mounted on the rack device, each wheel rotatably secured on the rack device by an axle device detachably secured on the rack device, a chassis secured to a boot or shoe of roller skate and pivotally secured to the rack device, and a locking device for locking the chassis with the rack device when each axle device is clamped in between the chassis and the rack device, whereby upon unlocking of the locking device to separate the chassis from the rack device, any one wheel can be removed from the rack device and replaced with a new one for conveniently dismantling the frame device and changing the wheels rotatably secured on the frame device.

Abstract: A size adjustable in-line roller skate includes: a chassis having a plurality of wheels linearly rotatably mounted under the chassis, a toe box member for enclosing a wearer's toes slidably engageable with and adjustably secured on a front portion of the chassis, and a heel enclosing member for enclosing the wearer's heel slidably engageable with and adjustably secured on a rear portion of the chassis, whereby upon a forward or backward movement of either the toe box member or the heel enclosing member, or both member's along the chassis, different lengths of the skate can be adjusted for obtaining the desired size of the wearer's foot or footwear for a comfortable skating.

Abstract: A buckle device for shoes includes a base member secured on a first upper side portion of a shoe upper, a detent device pivotally and resiliently mounted on the base member having at least a pawl formed on a bottom portion of the detent device for locking a ratchet toothed strap secured to a second upper side portion of the shoe upper with the strap insertable through the base member, and an adjusting device resiliently secured on at least a cantilever mounted on the base member to be normally separable from the ratchet toothed strap for a fastening of the strap on the base member as locked by the detent device, and the adjusting device operatively driving the ratchet toothed strap step by step for microscopically adjusting the tightness of the strap and the shoe to be worn by a user.

Abstract: An interchangeably assembled shoe includes: a sole mounted on a foot sporting article such as a roller skate, a rear shield detachably secured to an ankle portion of the sole by plural ventilation couplings each ventilation coupling serving for coupling and ventilation uses, a toe box member detachably secured to a toe portion of the sole and replaceable for different decorative features on the toe box member, plural instep members selected from a full tongue member, a shoelace member and a fastener member for selectively securing anyone desired instep member on a middle section of the shoe by plural ventilation couplings, a plurality of ventilation couplings further secured on the toe box member or on the toe portion of the shoe fluidically communicating with a shoe interior for a well ventilation in the shoe for comforting a wearer's foot, a lining inserted in the shoe, and a plurality of buckle devices fastened on the shoe for firmly fastening the instep member with the rear shield and fastening the instep