Shot Blasting Nozzle

Author:  Almen, J. O.
Source:  US Patent 2,439,032
Doc ID:  1948003
Year of Publication:  1948
Abstract:  
This invention relates to the art of shot peening. Cold working of metal articles to compact the surface layer by shot peening is easily accomplished if the surface can be exposed to the shot blast. Existing equipment is unsuited to the peening of interior surfaces of openings and cylinders and other out of the way places. An object of the present invention is to provide an improved tool for shot blasting interior surfaces including those of narrow deep holes into which the tool can be inserted axially and which tool includes as an important feature a rotatable deflector adjacent the nozzle to direct the blast substantially normal to the surface and by continuous deflector rotation relative to the nozzle will sweep the entire circumference once or repeatedly as may be desired.