The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 28, 1989
Filed:
Oct. 19, 1988
Roland K Eusemann, Aachen, DE;
Heinrich A Oepen, Stolberg-Gressenich, DE;
Anton Hammers, Aachen, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
Armature (4) is driven by piezo-electric vibration elements (1) which are made to resonate by means of high-frequency electrical oscillations in order to produce ultrasonic vibrations which are transmitted to a plurality of drive pins (2) arranged as brushes a friction surface (6) of the armature (4) is pressed against free ends (5) a of the pins, the individual drive pins bein disposed at an angle .alpha. relative to the perpendicular to the contact portion of the friction surface (6). The angle of inclination .alpha. is then substantially equal to the static-friction angle or is slightly larger than this static-friction angle between the drive pins and the friction surface. Suitably, the angle of inclination is selected to be between 10.degree. and 30.degree..