Patent ID: 8657027
Filing Date: 2014-02-25
Classification: B23B,E21B

Abstract:
1. A Single Piezo-Actuator Rotary-Hammering (SPaRH) Drill, comprising: a single piezoelectric stack actuator having an electrical signal input port and a mechanical signal output port; a horn transducer structure comprising a plurality of slotted helical members, said horn transducer mechanically coupled to said single piezoelectric stack actuator mechanical Signal output port to receive a linear mechanical signal from said single piezoelectric stack actuator and configured to provide an output mechanical signal simultaneously having both a longitudinal mode and a twisting mode; and a rotor/stator interface mechanically coupled to said slotted helical members of said horn transducer, said rotor/stator interface configured to receive from said horn transducer said mechanical signal simultaneously having both a longitudinal mode and a twisting mode, and configured to impart a longitudinal motion and a rotational motion simultaneously to a tool.