Patent ID: 7804682

Claim:
A positioning device capable of adjusting a rotational range, the positioning device comprising: a fixing component comprising an arc slot with an end; a positioning plate connected to the fixing component in a rotatable manner relative to the fixing component, the positioning plate comprising a pillar positioned within the arc slot; and a stopper positioned near on the end for stopping the pillar when the pillar slides near the end, a portion of the stopper protruding over the arc slot to limit a rotational range of the positioning plate relative to the fixing component, the stopper comprises a screw positioned on the fixing component in a movable manner, length of the screw protruding over the arc slot is adjustable so as to change the range limit of the positioning plate relative to the fixing component; wherein when the length of the screw protruding over the arc slot is increased, then the range of the positioning plate rotatable relative to the fixing component is reduced; wherein when the length of the screw protruding over the arc slot is reduced, then the range of the positioning plate rotatable relative to the fixing component is increased.