Metal working – Means to assemble or disassemble – By rotation of work part
Patent
1989-05-11
1992-06-30
Gorski, Joseph M.
Metal working
Means to assemble or disassemble
By rotation of work part
81 532, B23P 1904
Patent
active
051251442
ABSTRACT:
An extractor for a broken-off tool including a tap, drill, set screw, bolt, reamer and dowel retained within a bore in a workpiece comprises a body, there being an axial bore in the body opening at its top and towards its bottom terminating in a tapered conical throat and a coaxial cylindrical neck of reduced diameter communicating with the throat and depending from the body. The neck is adapted to nest within and protectively engage the workpiece bore and engage the workpiece. The bore, throat and neck are adapted to loosely receive a flux-coated welding rod at one end bearing against the broken tool and adjacent its other end being connected to an electrical power source, whereby on application of sufficient electrical power, the welding rod within the throat forms a weld mass interconnecting the body and the broken tool, rotation of the body withdrawing the broken tool from the workpiece. The method of extracting such broken-off tool comprises selecting a metal body having a bore opening at its top and a hollow neck communicating with the bore at its bottom; applying the body to a workpiece with the neck extending into the bore of the workpiece and engaging the tool, there being a downwardly converging throat in the body connecting the bore of the body and neck; applying an elongated flux-covered welding rod through the bore, throat and neck into operative engagement with the tool; applying a welding electric current to one end of said welding rod while grounding the workpiece; collecting melted portions of said welding rod within the throat and neck for welding the tool to the body; and upon hardening of the weld, rotating the body and attached broken tool and withdrawing the broken tool.
REFERENCES:
patent: 2165485 (1939-07-01), Jackman
patent: 3439567 (1969-04-01), Denis
patent: 3487733 (1970-01-01), Townsend
patent: 3529497 (1970-09-01), Brooks
patent: 4138909 (1979-02-01), Johnson
Gorski Joseph M.
Gossett Dykema
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