Assembly apparatus

1. An assembly apparatus comprising:

a fixed apparatus having a fixed region that includes a body element, a first fixed element protruding from an outer curved surface of the body element in a radial direction of the body element, and a second fixed element extending in a first direction that is vertical to the radial direction of the body element; and

a support apparatus having a receiving region that includes a first receiving element in which the first fixed element is inserted, rotated, and fixed, and a second receiving element in which the second fixed element is inserted, rotated, and fixed,

wherein an end of the second fixed element is connected to the body element, and another end of the second fixed element protrudes from a lower surface of the body element, and wherein the fixed region includes a third fixed element extending in the first direction and spaced apart from the second fixed element,

an end of the third fixed element is connected to the body element, and

another end of the third fixed element protrudes from the lower surface of the body element,

wherein the receiving region further includes a third receiving element in which the third fixed element is inserted, rotated, and fixed.

2. The assembly apparatus of claim 1 , wherein the first fixed element and the first receiving element fix the fixed apparatus to the support apparatus in the first direction.

3. The assembly apparatus of claim 1 , wherein the second fixed element and the second receiving element fix the fixed apparatus to the support apparatus in a rotation direction about an axis extending in the first direction.

4. The assembly apparatus of claim 1 , wherein the third fixed element and the third receiving element fix the fixed apparatus to the support apparatus in a rotation direction about an axis extending in the first direction.

5. The assembly apparatus of claim 4 , wherein the second fixed element and the second receiving element fix the fixed apparatus to the support apparatus in counterclockwise rotation about the axis extending in the first direction, and

the third fixed element and a third receiving element fix the fixed apparatus to the support apparatus in clockwise rotation about the axis extending in the first direction.

6. The assembly apparatus of claim 1 , wherein the third receiving element comprises a groove, and

the third fixed element is located at an end of the groove when the fixed apparatus is fixed to the support apparatus.

7. The assembly apparatus of claim 1 , wherein each of the first fixed element, the second fixed element, and the third fixed element is provided in pairs, and

each of the first receiving element, the second receiving element, and the third receiving element is provided in pairs.

8. The assembly apparatus of claim 1 , wherein the first fixed element has a flat fan shape, and the second and third fixed elements have pin shapes.

9. The assembly apparatus of claim 8 , wherein a lower surface of the first fixed element is coplanar with the lower surface of the body element, and

an upper surface of the first fixed element is lower than an upper surface of the body element.

10. The assembly apparatus of claim 8 , wherein the body element has a cylinder shape, and

an outer curved surface of the first fixed element has the same curvature as that of the outer curved surface of the body element.

11. The assembly apparatus of claim 8 , wherein the support apparatus comprises a cover element that covers the first fixed element when the fixed apparatus is fixed to the support apparatus.

12. The assembly apparatus of claim 1 , wherein the second receiving element comprises a hook, and

the second fixed element is fixed to the hook when the fixed apparatus is fixed to the support apparatus.

13. The assembly apparatus of claim 1 , wherein a printed circuit board is mounted on the fixed apparatus.

14. The assembly apparatus of claim 1 , wherein a display apparatus is mounted on the fixed apparatus.