Patent ID: 8113478

Claim:
A stack board comprising: a base defining a plurality of guide channels therein; a supporting platform mounted on the base and capable of supporting an object thereon; and a plurality of pivots connected between the base and the supporting platform, the pivots received in the guide channels, respectively, and moveable along the guide channels such that the supporting platform is movable relative to the base from a first position substantially coinciding with the base to a second position protruding from one side of the base; wherein the base comprises two guide walls parallel to and spaced from each other, the guide channels being defined in the guide walls; wherein the guide channels defined in each guide wall comprise a first guide channel at one end of the guide wall and a second guide channel at a central portion of the guide wall, the first guide channel comprising a first locating hole at a top of the guide wall, a first groove extending downward from the first locating hole towards a bottom of the guide wall, and a vertical groove extending up from a bottom end of the first groove, the second guide channel comprising a second locating hole at the top of the guide wall, and a second groove extending downward from the second locating hole towards the bottom of the guide wall; wherein in each guide wall, the first locating hole and the second locating hole are substantially located at a same height, and the first and second grooves are substantially parallel to each other and oblique with respect to a line defined by the first and the second locating holes; and wherein a top end of the vertical groove is substantially located at the same height as the first and second locating holes.