Patent ID: 8052366

Claim:
An attachment to be secured to a hard surface including a fastener to be driven into the hard surface by an explosive operated setting tool, the fastener having an axially extending shank with a tip at a leading end and a head at a trailing end, a connector having an axially extending body with a leading and trailing end, laterally enclosing at least the tip of the fastener at its trailing end, and a bracket having a leading and trailing side, the trailing side engaged by the leading end of the connector, the leading side of the bracket engaging the hard surface, wherein the improvement comprises the leading end of the connector shaped as a conical frustum, with a smaller top of the conical frustum positioned between a larger top of the conical frustum and the trailing end of the connector, the bracket having a conical frustum-shaped aperture with the larger opening of the conical frustum-shaped aperture on the leading side of the bracket and the smaller opening on the trailing side of the bracket, the conical frustum-shaped aperture being sized to receive the conical frustum on the connector.