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:
Apr. 23, 1996
Filed:
Feb. 03, 1995
Andre Coulon, Bessoncourt, FR;
GEC Alsthom Electromecanique SA, Paris, FR;
Abstract
The present invention relates to a method and apparatus for surface treating and putting under compression prestress the inside wall of a cavity, in particular a cylindrical cavity of circular section. The apparatus comprises a bulb-shaped vibrator provided with a tubular portion designed to be engaged in an orifice of a cavity to be treated. It is associated with a vibration exciter designed to excite the vibrator at its resonant frequency. The treatment is obtained by shot in the form of balls being projected against the walls of the cavity and returned into the treatment field by a reflector. The method is particularly applicable to treating holes that are designed to receive the fixing pins of turbine blades.