Method of manufacturing a clinch pin fastener
AssigneePEM Management, Inc.
InventorMichael Maloney
Life of this patent
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Abstract
A clinch-type fastener is formed by simultaneously creating an undercut during the same forging that creates the head and displacer of the fastener. A fastener blank is compressed end-to-end between top and bottom dies whereby the axial compression of a blank causes the outward bulging of the shank at its midline. Simultaneously, a tapered end point and a tangential interference band are formed provided by a curvilinear-shaped bulge in the shank. As the bulge is formed an undercut is created between the bulge and a shoulder which extends downwardly from a head of the fastener. This method of formation and the fastener produced thereby are particularly suited to the manufacture of small clinch pins having a diameter in the range of 1.0 mm.
Claims7
A method of manufacturing by cold-forging a free-standing metal fastener comprising:
- providing a clinch pin fastener blank having a head, a shoulder and a shank of reduced diameter in that order top to bottom;
- compressing end-to-end the fastener blank only between a top die and a bottom die whereby the axial compression of the blank causes the outward bulging of the shank at a midline thereof;
- and
- continuing said compression until an undercut is formed contiguously between the bulge and the shoulder.
Dependencies are inferred from the claim text.