A case, one end disposed outside of the case, and a pivot link that is rotatably mounted in the case, the present invention, the longitudinal direction of the rotary link in one side of the pivot link and the other end a force transmission shaft, which is mounted vertically on one end is rotatably mounted to the inside of the case, to rotate the outer edge is brought into contact with the force transmission shaft, a crank for receiving the transmission of the external force by the force transmission shaft the connecting link and the link, one end is rotatably connected to the other end of the crank link is pivotally connected to the other end of the connecting link, the external force of preset value or more applied to the pivot link if it is, to provide a safety device having the same, and the safety unit comprises a, support means for permitting rotation of the connecting link and the crank link. [Selection] Figure Figure 1
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