Tool for repairing damaged threads in a blind hole

Details Tool for repairing damaged threads in a blind hole Tool for repairing damaged threads in a blind hole

1993-02-08

1994-01-25

Bishop, Steven C.

Cutting by use of rotating axially moving tool

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

To move radially

408168, 408222, 408714, 470201, 470209, B23G 514

Patent

active

052810593

ABSTRACT:
An adjustably expandable fluted tap to reform damaged threads defined in a blind hole, such as a spark plug hole. The tool provides an elongate body with a first end defining an expandable fluted tap having a relaxed diameter smaller than but matingly similar to the threads to be repaired, and a second end defining a butterfly handle. The body defines a medial channel carrying an arbor with a first end having a tapered forcing cone for expanding the fluted tap, and a second end threadedly engaged in a round knurled nut carried externally of the second end of the body. The tap is inserted in a hole beyond the damaged threads, the knurled nut tightened to retract the forcing cone to expand the fluted tap into mating engagement with the undamaged threads and the tool is then screwed out of the hole by revolving the butterfly handle to reform the damaged threads as it is withdrawn therepast.

REFERENCES:
patent: 53996 (1866-04-01), Loomis
patent: 316040 (1885-04-01), Johnson
patent: 715671 (1902-12-01), Krastin
patent: 1217833 (1917-02-01), Santmyers et al.
patent: 1418721 (1922-06-01), Larson
patent: 2284768 (1942-06-01), Ramsdell
patent: 2616103 (1952-11-01), Stecher
patent: 3864806 (1975-02-01), Hanson et al.
patent: 4661028 (1987-04-01), Sanger
patent: 5025556 (1991-06-01), Stafford

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