发明名称 VARIABLE FORCE/VARIABLE FREQUENCY SONIC DRILL HEAD
摘要 An oscillator assembly includes a first eccentrically weighted rotor having a first eccentric weight configured to rotate about an axis, a second eccentrically weighted rotor having a second eccentric weight configured to rotate about the axis. Rotation of the first eccentrically weighted rotor is coupled to rotation of the second eccentrically weighted rotor. An actuator is configured to vary an angular separation between the first eccentric weight and the second eccentric weight.
申请公布号 EP2425085(A4) 申请公布日期 2015.08.12
申请号 EP20100770254 申请日期 2010.04.28
申请人 LONGYEAR TM, INC. 发明人 LIGHT, TREVOR, LYNDON
分类号 E21B7/24;E21B19/08;E21B19/22 主分类号 E21B7/24
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