Spring bolt assembly

The invention provides a spring bolt assembly comprising a cover body, a rotating piece, a connection rod, a safety hook and a spring bolt. A rotating part of the rotating piece is rotationally inserted into the cover body. A connection column of the rotating piece is rotationally inserted into a first part of the connection rod. A transmission column of the safety hook is rotationally inserted into a second part of the connection rod. A containing cavity is arranged in the spring bolt. The safety hook is movably located in the containing cavity. A limiting part of the safety hook movably abuts against a limiting opening of the spring bolt. The spring bolt is movably clamped by the cover body. A limiting wall of the cover body covers the limiting opening. The rotating piece drives the spring bolt and the safety hook to move sequentially through the first part, the second part and the limiting part so as to enable the safety hook to protrude out of the containing cavity and hook a doorholder. Simple column ins