Case assembly

A case assembly, comprising:

• an upper case and a lower case;
• a pivot, respectively connected the upper case and the lower case, wherein the upper case is arranged to rotate with respect to the lower case, with the pivot as the rotation axis;
• a first shaft, disposed in the upper case;
• a second shaft, disposed in the lower case, wherein the axial directions of the first shaft and the second shaft are parallel to the axial direction of the pivot;
• a stopper, including a shaft hole running through the stopper, a guiding slot hole, and a fixing slot hole, wherein the stopper includes a first end and a second end connected to each other, the shaft hole is disposed at the first end, the fixing slot hole is disposed at the second end, one end of the fixing slot hole communicates with the guiding slot hole, the fixing slot hole and the guiding slot hole define an included angle, and the first shaft and the second shaft respectively insert into the shaft hole and the guiding slot hole;
• a plurality of notches interval disposed in the stopper and communicating to the guiding slot hole;
• wherein when the upper case rotates with respect to the lower case, the stopper takes the first shaft as the rotation axis to rotate, and the guiding slot hole are driven to move with respect to the second shaft, so that the second shaft is selectively stuck in the fixing slot hole or one of the notches from the guiding slot hole and that the upper case is fixed to different angles.