Bolt anchor for inserting into a concrete surface comprises spreading tongues having cutting edges arranged behind each other on the outer side of their free ends

摘要

Bolt anchor (10) comprises spreading tongues (30) having cutting edges (34, 36) arranged behind each other on the outer side of their free ends. The spreading tongues are structured so that they are spread into a spreading sleeve (32) during insertion of a spreading cone (26). Preferred Features: Each spreading tongue has a predetermined bending site (40) in the region of a non-free end. The inner diameter of the spreading sleeve is at least the same size of the diameter of a reduced shaft section (24).