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:
Sep. 21, 2010
Filed:
Apr. 21, 2009
Hiroshi Kawano, Atsugi, JP;
Tatsuya Hirahara, Kyoto, JP;
Hiroshi Kawano, Atsugi, JP;
Tatsuya Hirahara, Kyoto, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
To provide a screw fastening device that, when performing a screw tightening operation, can substantially reduce the running torque directly applied by external forceto a screw driving device. A characteristic constitution is adopted that is equips a screw driving device αwith a device bodythat stacks a plurality of piezoelectric elementsandthat generate predetermined ultrasonic oscillations with the application of a predetermined AC voltage and excites mechanical oscillations in a predetermined direction on an oscillating end surfacebased on the ultrasonic oscillations; and a male distal end portionthat is correspondingly formed to be capable of fitting in a female recessformed in a screw βand integrally fixed to the device bodyon the oscillating end surfaceof the device bodyto impart running torque, which is directly applied to the screw driving device αby external force, and transmit the mechanical oscillations in the predetermined direction that the device bodyexcites to the screw β, with which contact is made by fitting in the female recess