Spike forming method

Details Spike forming method Spike forming method

1986-01-31

1987-07-28

Combs, E. Michael

10 27R, B21K 144, B21G 300

Patent

active

046823816

ABSTRACT:
The present invention relates to a method for forming a blank railroad spike using a series of cold forming dies. A workpiece is introduced into a first die to form a first stage spike having a squared end and a thick cylindrical shank. The first stage spike is introduced into a second cold forming die to form a second stage spike in which a lower portion of the shank is decreased in diameter, while a upper portion of the shank maintains the same diameter as in the first stage spike. The second stage spike is introduced into a third cold forming die to form a third stage spike in which the upper portion of the shank is compressed to form a collar for the spike. The blank spike is subsequently introduced into a thread cutting apparatus to form the finished threaded spike.

REFERENCES:
patent: 1255504 (1918-02-01), Blakeslee
patent: 2024070 (1935-12-01), Sharp
patent: 3072933 (1963-01-01), Carlson
patent: 3247534 (1966-04-01), McClellan
patent: 4586231 (1986-05-01), Powderly et al.

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