A needle point guard having a movable collet to lock the needle in place in the shielded position is provided. The needle point guard of this invention includes a housing, a collet, a rotary ram, a threaded cam fixed to the rotary ram, a spring disposed between the rotary ram and the housing and a trigger...http://www.google.de/patents/US5582597?utm_source=gb-gplus-sharePatent US5582597 - Rotary ram collet lock needle point guard
