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:
May. 18, 1993
Filed:
Dec. 05, 1990
Bruce M Hatton, Carol Stream, IL (US);
Jaklin Yoesep, Arlington Heights, IL (US);
Stephen M Hutchings, Oswego, IL (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A vibration transducer for sensing engine knock. On embodiment for resonance upon vibration at frequencies in the range of 5-7 KHz has a centrally stanchion-supported overhanging metal disc with an annular stiffening portion formed with in transverse section with contracurvature and generally rectangular configuration for minimizing ringing. Piezoelectric material is bonded to the disc surface inwardly of the stiffening portion for providing an electrical signal during resonant disc flexure. A second embodiment for resonance upon vibration at frequencies in the range of 9-15 KHz has a centrally stanchion-supported overhanging metal disc with an annular stiffening portion for minimizing ringing formed in transverse section with contracurvature comprising a generally semicircular convolution. Piezoelectric material is bonded to the disc surface and bridges the stiffening portion and provides an electrical signal during resonant disc flexure.