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A dual-purpose includes an outsole having increased thickness for forming two open-bottomed cavities. In each of the cavities, there is mounted a wheel assembly that includes a fixing bracket screwed to a top of the cavity, a wheel holder movably mounted in the fixing bracket, a wheel rotatably supp

A dual-purpose includes an outsole having increased thickness for forming two open-bottomed cavities. In each of the cavities, there is mounted a wheel assembly that includes a fixing bracket screwed to a top of the cavity, a wheel holder movably mounted in the fixing bracket, a wheel rotatably supported on the wheel holder, and a pair of control plates fixed at two sides of the fixing bracket to connect at an end to the wheel holder. The control plates of each of the wheel assemblies mounted in the cavity are connected to an external knob. Turning the knob clockwise or counterclockwise causes the control plates to pivotally turn and thereby bring the wheel holder to move upward or downward in the fixing bracket. When all the wheel holders are moved upward, the wheels retract into the cavities and the shoe functions like an ordinary shoe, and when the wheel holders are moved downward, the wheels expose from the cavities and the shoe functions like a roller skate.

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1. A dual-purpose shoe comprising an outsole having an increased thickness and being provided at front and rear end portions with two open-bottomed cavities, in each of which a wheel assembly is mounted, said outsole also being provided at one lateral side corresponding to said cavities with two thr

1. A dual-purpose shoe comprising an outsole having an increased thickness and being provided at front and rear end portions with two open-bottomed cavities, in each of which a wheel assembly is mounted, said outsole also being provided at one lateral side corresponding to said cavities with two through holes to communicate internal spaces of said two cavities with a space outside said outsole, each of said two through holes having a knob mounted therein for manipulating said wheel assembly mounted in said cavity corresponding to said through hole, in order to move a wheel of said wheel assembly between two positions, namely, an extended position and a retracted position; said wheels in said extended position being partially downward exposed from said cavities, enabling said shoe to function like a roller skate; and said wheels in said retracted position being completely received in said cavities, enabling said shoe to function like an ordinary shoe suitable for walking; each of said wheel assemblies mainly including a wheel, a fixing bracket, a wheel holder, and two control plates; said fixing bracket in each said wheel assembly having two side walls and a top to define a front, a rear, and a bottom opening, said two side walls being symmetrically provided at predetermined positions with a curved slot and a guide slot, and said top being provided with a number of mounting holes, said front opening being provided at two vertical sides with two stoppers that are provided at predetermined positions with two pins to face each other; said wheel holder in each said wheel assembly also having two side walls and a top to define a front, a rear, and a bottom opening, and being sized for locating in said fixing bracket, said top having a front edge horizontally projected forward by a predetermined length to form an extension, said two side walls being symmetrically provided at predetermined positions with a limiting hole and an axle hole, and said limiting hole being so shaped that an upward and a downward extended curved edge are formed at a rear part of said limiting hole; said wheel holder being movably mounted in said fixing bracket with said front extension located between said two vertical stoppers and above said two pins of said fixing bracket, and said wheel being rotatably supported in said wheel holder on an axle extended through said axle holes; said two control plates in each said wheel assembly being fixedly connected to two ends of a shaft that is extended across said fixing bracket to project two ends from said two side walls of said fixing bracket, each of said two control plates being provided at an inner side of a first end with an inward projected bar, and at predetermined positions at a second end with two retaining holes; said inward projected bars of said control plates inward extending through said guide slots on said fixing bracket and said limiting holes on said wheel holder, so that said wheel holder is held in said fixing bracket by said bars; and each of said knobs being a cylindrical member having a grip portion provided at one outer end thereof and two long pins axially projected from an inner end of said knob; said knob being fitted in said through hole provided at one lateral side of said outsole with said grip portion exposed to outside and said two long pins engaged with said two retaining holes on said control plate closer to said knob; whereby when said knob is turned at said grip portion clockwise or counterclockwise, said control plates are caused to pivotally turn about said shaft and bring said bars at the first end thereof and accordingly said wheel holder supported on said bars to move upward or downward, enabling said wheel supported on said wheel holder to move into said retracted position or said extended position.