Method of and apparatus for making a sheet metal zig-zag key

Details Method of and apparatus for making a sheet metal zig-zag key Method of and apparatus for making a sheet metal zig-zag key

1977-02-22

1978-08-01

Larson, Lowell A.

Metal tools and implements, making

Blank or process

Keys

72385, 219153, B21D 5342

Patent

active

041035704

ABSTRACT:
This invention describes a method of making a sheet metal zig-zag key for a lock. The technique of making a zig-zag key, either as a duplicate of another or in the original form, consists of passing a heavy current through the key so as to get it into a plastic state such as, for example, a red heat, and then deforming it into the desired shape.

REFERENCES:
patent: 598469 (1898-02-01), Mouat
patent: 1112779 (1914-10-01), Forsyth
patent: 1251578 (1918-01-01), Riecken
patent: 1362708 (1920-12-01), Lang
patent: 1436357 (1922-11-01), Reichard
patent: 1900794 (1933-03-01), Brun

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