Protective casing for electronic device

Abstract

The present disclosure provides a protective casing, configured for protecting an electronic device. The protective casing comprises an outer casing and an inner casing. The outer casing is made of metal material. The inner casing is positioned inside the outer casing. The inner casing is made of nonmetal material, and the inner casing is clipped with the outer casing.

What is claimed is: 
     
         1 . A protective casing configured for protecting an electronic device, the protective casing comprising:
 an outer casing made of metal material; and   an inner casing positioned inside the outer casing and being made of nonmetal material, and the inner casing being clipped to the outer casing.   
     
     
         2 . The protective casing of  claim 1 , wherein a receiving cavity is defined in one of the outer casing and the inner casing, a clipping portion is formed on the other one of the outer casing and the inner casing, and the clipping portion is clipped in the receiving cavity to fix the inner casing onto the outer casing. 
     
     
         3 . The protective casing of  claim 2 , wherein the outer casing comprises two prismatic bars, the two prismatic bars are spaced from each other, and the receiving cavity is defined between the two prismatic bars. 
     
     
         4 . The protective casing of  claim 3 , wherein the outer casing further comprises an outer surface, an inner surface opposite to the outer surface, and a connecting surface connecting the outer surface and the inner surface. 
     
     
         5 . The protective casing of  claim 4 , wherein the connecting surface connects lateral edges of the outer surface and the inner surface. 
     
     
         6 . The protective casing of  claim 4 , wherein the outer surface and the inner surface are both curved. 
     
     
         7 . The protective casing of  claim 6 , wherein radius of curvature of the outer surface and the inner surface are the same. 
     
     
         8 . The protective casing of  claim 4 , wherein each prismatic bar extends from a joint of the inner surface and the connecting surface away from the outer surface and then extends towards the other prismatic bar, and ends of the two prismatic bars are close to each other and form a clip together. 
     
     
         9 . The protective casing of  claim 8 , wherein the inner casing comprises an abutting portion and a clipping portion, and the abutting portion abuts the ends of the two prismatic bars of the outer casing. 
     
     
         10 . The protective casing of  claim 9 , wherein the clipping portion extends from a surface of the abutting portion, the clipping portion comprises a head and a neck, a size of the head is larger than that of the neck, the neck is clipped in the clip of the outer casing, the head is received in the receiving cavity. 
     
     
         11 . The protective casing of  claim 3 , wherein the two prismatic bars are parallel to each other, and a length of each of the prismatic bar is equal to that of the outer casing. 
     
     
         12 . The protective casing of  claim 2 , wherein the clipping portion is formed on the outer casing and the receiving cavity is defined in the inner casing corresponding to the clipping portion. 
     
     
         13 . The protective casing of  claim 12 , wherein the outer casing comprises two first outer casings and two second outer casings, the two first outer casings face each other, and the two second outer casings face each other, the two first outer casings and the two second outer casings surround to form a rectangular shape. 
     
     
         14 . The protective casing of  claim 12 , wherein the inner casing is a rectangular shape and is clipped on inner sides of the first outer casings and the second outer casing.