Thread forming apparatus having tangential chasers for cutting a

Details Thread forming apparatus having tangential chasers for cutting a Thread forming apparatus having tangential chasers for cutting a

1987-09-03

1989-04-25

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

Tool or tool with support

With pitch-stabilizing ridge

10111, 408221, B23G 504

Patent

active

048242977

ABSTRACT:
The present invention relates to a device for cutting a thread on a railroad spike. The device employs tangential chasers which are designed to form a thread on a cylindrical portion and a tapering portion of the shank. The chasers form a thread having a constant pitch, root and crest diameter. The chasers are also designed to provide a gap of constant length between the forward flank of a thread on one turn and the rearward flank of the thread on an adjacent turn.

REFERENCES:
patent: 1936696 (1933-11-01), Thomson
patent: 2067593 (1937-01-01), Benninghoff
patent: 2378951 (1945-06-01), Reimschissel
patent: 2908022 (1959-10-01), Strobel
patent: 3093850 (1963-06-01), Kelso
patent: 4278374 (1981-07-01), Wolosianski

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