US Patent 10032054 Rotatable assembly and scanning device including the same

A rotatable assembly includes a rotatable collar, a rotatable stopper and a fixed stopper. The rotatable collar has a first slide groove. The rotatable stopper includes a first slider and a second slider which are opposite to each other. The first slider slidably is installed in the first slide groove. The rotatable collar is rotatable relative to the rotatable stopper within a first rotatable angle by the first slider. The fixed stopper has a second slide groove. The second slider is slidably installed in the second slide groove. The rotatable stopper is rotatable relative to the fixed stopper within a second rotatable angle by the second slider. A sum of the first rotatable angle and the second rotatable angle is 360 degrees.