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Title:
VARIABLE FORCE/VARIABLE FREQUENCY SONIC DRILL HEAD
Document Type and Number:
WIPO Patent Application WO/2010/126990
Kind Code:
A3
Abstract:
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.

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Inventors:
LIGHT TREVOR LYNDON (US)
Application Number:
PCT/US2010/032738
Publication Date:
February 24, 2011
Filing Date:
April 28, 2010
Export Citation:
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Assignee:
LONGYEAR TM INC (US)
LIGHT TREVOR LYNDON (US)
International Classes:
E21B7/24; E21B19/08; E21B19/22
Foreign References:
US6129159A2000-10-10
US5004055A1991-04-02
US4113034A1978-09-12
US6604583B12003-08-12
Other References:
See also references of EP 2425085A4
Attorney, Agent or Firm:
ISRAELSEN, Burns, R. et al. (1000 Eagle Gate Tower60 East South Templ, Salt Lake City UT, US)
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