| 摘要 |
The present invention is directed to an improved polymeric drive mandrel for the insertion of helical thread inserts into complementally tapped bores. The mandrel comprises a generally cylindrical body formed of polymeric material externally threaded for the reception of an insert, known per se, the device being characterized by the provision of a metallic drive blade extending generally axially of the polymeric portion, the drive blade including side edges juxtaposed at or intimately adjacent the roots of the threads at at least the drive end of the mandrel, whereby radial compression of the insert, experienced in the course of the driving thereof, is prevented from damaging the lead thread portions of the mandrel and driving torque is distributed over an extended length of the mandrel. |
