Combined structure

Disclosed is a combined structure, and the combined structure includes a coupling target object having a coupling space that comprises a first space and a second space 5 communicating with each other, a damper structure accommodated in the first space and including a flexible portion having a hollow therein and a hard portion coupled to the flexible portion and having one surface exposed to an outside, and a coupling unit accommodated in the second space, a portion of which is in contact with one surface of the hard portion. The hollow is closed from the outside in the damper structure. In response to rotation of the 10 coupling unit in the second space, another portion different from the portion of the coupling unit comes into contact with the hard portion. When the coupling unit rotates in one direction from an initial state, in which the coupling unit is inserted into the second space, to become a first rotation state, a portion where the coupling unit and the hard portion contact each other is moved in a direction toward the flexible portion further than the initial state, and 5 thus, the hard portion is moved in the direction toward the flexible portion further than the initial state. The flexible portion is compressed and deformed between the hard portion and an inner surface of the coupling target object forming the first space. [FIG. 8] H111 13 32 3131 200 11~13 :10 S11 S12 31, 32 :30 ... ... 3 1 3 2 (a)20 H111 13 ()3131 S12 200 11-13 :10 S1132 31, 32 : 30 H111 13 3131 200 11-13 :10 S11 51231, 32 : 30 ---31 (c) 3132