Patent ID: 8807497

Claim:
A footstand mechanism for adjusting a tilt angle of an electronic device, comprising: a shaft rotatably disposed on a base of the electronic device; a first engaging member disposed on the base and located in a position corresponding to an end of the shaft; a polygonal block installed on the shaft and rotating with the shaft, the polygonal block comprising a plurality of supporting surfaces, the plurality of supporting surfaces being respectively away from the shaft by different distances; a second engaging member disposed at the end of the shaft and comprising a plurality of engaging portions, the plurality of engaging portions being corresponding to the plurality of supporting surfaces for respectively engaging with the first engaging member; a fixing member disposed at another end of the shaft and comprising a plurality of fixing portions respectively corresponding to the plurality of the engaging portions of the second engaging member; and a sliding block disposed on the base and located nearby the fixing member, the sliding block comprising a constraining portion for engaging with a corresponding fixing portion when the sliding block slides to a first position and when any one of the plurality of engaging portions engages with the first engaging member, so as to fix the shaft, the constraining portion separating from the fixing member when the sliding block slides to a second position, so as to release the shaft.