Method for roll pointing a threaded screw
AssigneeAluminum Company of America
InventorCharles H. Deveney, Jr.
Life of this patent
Estimating the term…
Abstract
A method for making a pointed, threaded fastener by threading, tapering and pointing in thread rolling equipment a screw blank having a cavity extending longitudinally into the blank from the end of the shank.
Claims8
A method for making a pointed, threaded screw, comprising providing a generally cylindrical screw blank having a hollow cavity extending longitudinally into the blank from one end thereof, roll threading, tapering and pointing at least a portion of said blank adjacent said cavity and breaking away a portion of said blank having said cavity therein.
A method for making a pointed threaded screw, comprising the sequential steps of:
- (a) providing a screw blank having a cavity in one end of a shank portion, said cavity extending longitudinally inwardly from the outermost surface of said one end with axes of said cavity and said blank coincidental;
- (b) rolling a continuous thread on at least a portion of said shank of said blank while tapering inwardly a threaded portion of said shank adjacent said cavity of said blank and longitudinally extruding a portion of said blank being displaced by said rolling and said tapering;
- (c) shearing away said extruded portion and said end portion having said cavity therein;
- and
- (d) finishing and sizing said continuous thread on the shank of the tapered and pointed blank.
Dependencies are inferred from the claim text.