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Mechanism comprised of ultrasonic lead screw motor

  • US 7,309,943 B2
  • Filed: 10/28/2005
  • Issued: 12/18/2007
  • Est. Priority Date: 09/08/2003
  • Status: Expired due to Term
First Claim
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1. An apparatus comprising a threaded nut with an axis of rotation and, engaged therewith, a threaded shaft with an axial direction and a length, and a vibration system that subjects said threaded nut to ultrasonic vibrations and thereby causing said threaded shaft to rotate and said threaded nut to translate in said axial direction over a portion of said length of said threaded shaft, the vibration system comprising two or more pairs of substantially opposing members, wherein each of the pairs alternatively has one of the substantially opposing members causes one portion of the threaded nut to contact the threaded shaft while the other one of the substantially opposing members causes another portion of the threaded nut to have clearance from the threaded shaft.

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