Patent ID: 8272617

Claim:
An adjustable supporting stand, comprising: a main body; a slidable module disposed on the main body; a supporting holder, mounted on the slidable module, wherein the supporting holder slides relatively to the main body; a gear set, wherein the gear set has a first gear connected to the supporting holder and a second gear coupled to the first gear, the first gear is assembled on a turning plate; and an elastic member disposed on the main body, wherein the elastic member has opposite first end and second end, the first end is adjustably fixed on the main body, and the second end is connected to the second gear; when the slidable module is positioned in a first position, the elastic member has a first resilient force, and the second end is located as the same horizontal level with the rotary shaft of the second gear, the first resilient force is applied on a first positive force arm; when slidable module slides from the first position downwardly and is positioned in a second position, the elastic member has a second resilient force, and the second resilient force is applied on a second positive force arm, the second resilient force is greater than the first resilient force, the second positive force arm is smaller than the first positive force arm.