Reverse cutting expansion tap

Details Reverse cutting expansion tap Reverse cutting expansion tap

1986-02-20

1987-04-28

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

Tool-support with means to move tool relative to tool-support

To move radially

408156, 10145, B23G 514

Patent

active

046610286

ABSTRACT:
An expansion tap having a body (20) with a head (22) on one end and angularly tapered threads (26) on the other, with a bore (24) running therethrough. The body (20) has a shoulder stop (38) in the middle and a plurality of flutes (28) through the threaded portion. A capscrew (46) penetrates the bore (24) and is threadably engaged to a forcing cone (40) contiguous with the bore on the threaded end. A plurality of aligning ribs (44) engage the flutes (28), preventing rotation when the capscrew is tightened. The tap is inserted into a damaged threaded hole engaging the original threads in the middle and subsequently expanded by tightening the capscrew (46), thus straightening the tapered thread portion until the lands are parallel. Removal of the tap straightens and recuts the damaged threads.

REFERENCES:
patent: 53996 (1866-04-01), Loomis
patent: 391777 (1888-10-01), Buck
patent: 826244 (1906-07-01), Grace
patent: 2284768 (1942-06-01), Ramsdel
patent: 2360472 (1944-10-01), Brussell
patent: 2616103 (1947-02-01), Stecher
patent: 4090808 (1978-05-01), Nannen
patent: 4097180 (1978-06-01), Kwieraga

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