Patent ID: 8430614

Claim:
A post-installed anchor driven in a pilot hole to be securely fixed, comprising: a bolt body structured to have a threaded end; a fixation member structured to have a threaded end screwed to the threaded end of the bolt body and an expansion end on a side facing a head of the bolt body; and a large-diameter feature formed to have a larger diameter than the threaded end and structured to allow the expansion end of the fixation member to ride on one end of the large-diameter feature with a movement of the fixation member toward the head of the bolt body, which is induced by rotation of the bolt body, wherein: the large-diameter feature and the expansion end are both made of metal; the expansion end of the fixation member has a cut formed in an axial direction on an edge of the expansion end in proximity to the large-diameter feature; the expansion end divided by the cut has a shape widened toward the edge of the expansion end; as the bolt body rotates, the expansion end of the fixation member rides on the large-diameter feature and is thereby widened, buckled, and extended outward and bites into an inner wall of the pilot hole to be fixed thereto; further comprising a plurality of concavities in an outer surface of the expansion end of the fixation member, the concavities being configured to facilitate the widening and extension outward of the expansion end of the fixation member, and to enhance the fixing to the anchor to the pilot hole.