Anchor bolt with nail driven into tube having apertures with ball shot which is expanded

摘要

Tube 2 has holes 4 acting as barrels for accommodating solid shot 5. Driving nail 3 into tube 5 forces shot radially outwards and into surrounding base 1. It is noted that the fastening may be removed by withdrawing nail 3 by inserting a suitable tool into recessed key 10, followed by withdrawing tube 2 by applying extra torque to nut 6.