| 摘要 |
PURPOSE: An insert for coupling a bolt is provided to conveniently install a bolt in an M-bar or ceiling concrete and to securely maintain a coupling state of the bolt and the M-bar. CONSTITUTION: An insert(1) for coupling a bolt comprises a body(3), tightening pieces(9,11), a cover(13), and a coil spring(15). The body is composed of a lower cylindrical part(5) and an upper cylindrical part(7). The upper cylindrical part is placed on the top of the lower cylindrical part and has a bigger diameter than the lower cylindrical part. The tightening pieces are separated from each other and are inserted into the top of the lower cylindrical part. The cover is coupled to the top end of the upper cylindrical part. The coil spring is installed between the bottom surface of the cover and the tightening pieces.
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