Broach
AssigneeLear Siegler, Inc.
InventorsEugene J. Bistrick, Stewart F. Miller, Axel B. Abrahamsson, Richard A. Schlaf
Life of this patent
Estimating the term…
Abstract
A tension broach comprising a drawbar, a roughing shell on said bar, a finishing shell on said drawbar, said drawbar supporting said roughing shell against axial movement and limiting rotational movement thereon, said drawbar supporting said finishing shell against axial movement, and means for locating said finishing shell in angular alignment with said roughing shell with provision for slight angular movement.
Claims8
A tension broach comprising an elongated drawbar having a first cylindrical locating surface adjacent its forward end and a flat forwardly facing annular abutment surface at the trailing end of said first locating surface, a tubular roughing shell on said drawbar having a multiplicity of series of longitudinally aligned rough cutting teeth, said roughing shell having a cylindrical internal surface fitting said first locating surface and a flat, rear, annular abutment surface engaging the abutment surface on said drawbar, said drawbar having a second enlarged cylindrical locating surface extending rearwardly from the abutment surface on said drawbar, a tubular finishing shell on the second enlarged cylindrical locating surface of said drawbar having an internal cylindrical surface fitting said second locating surface on said drawbar and having a multiplicity of finish cutting teeth in longitudinal alignment with said rough cutting teeth, and abutment means on said drawbar having a forwardly facing flat annular abutment surface, said finishing shell at its rear end having a flat annular abutment surface engaging the abutment surface of said abutment means.
Dependencies are inferred from the claim text.