Method and apparatus for making a forming pin
AssigneeIllinois Tool Works Inc.
InventorsDon T. Van Allman, Amos Corbin
Life of this patent
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Abstract
A forming pin having a shank, a head, a point, and a pair of like grooves on opposite sides of the shank is made by gripping an elongate wire in a position wherein an end of the wire is exposed, forming a head at the exposed end of the wire while gripped, advancing the wire by a predetermined distance, and simultaneously forming the point and forming the grooves. The forming pin thus formed is severed from the remaining wire as the point and the grooves are formed. A pair of dies are used, which are movable so as to pinch the wire therebetween, along with mechanisms for closing the dies. The dies are configured similarly to define suitable forming edges.
Claims12
A method for making a forming pin having a groove so as to enable a protruding portion of the forming pin, when driven into a workpiece, to be severed at the groove, comprising the steps of:
- (a) gripping an elongate wire firmly at a position wherein an end of the wire is exposed;
- (b) forming a head at the exposed end of the wire while said wire is gripped;
- (c) axially advancing the wire by a predetermined axial distance;
- and
- (d) simultaneously (1) forming a point on the advanced wire and (2) forming a groove upon the advanced wire for reducing the cross-section of the advanced wire.
In a machine for forming a forming pin from an elongate wire, a combination comprising:
- a pair of dies;
- means for closing the dies so as to pinch the wire between the dies such that an end portion of said wire protrudes outwardly from said dies;
- means for forming a head portion upon said end portion of said wire protruding outwardly from said dies;
- means for axially moving said wire such that said head portion is disposed axially remote from said dies;
- and
- means for simultaneously forming a point and a groove, for reducing the cross-section of the wire, upon portions of said wire remote from said head portion of said wire, when the dies are closed so as to pinch and retain the wire therebetween while said point and groove are formed.
Dependencies are inferred from the claim text.