Gas diffuser for head tube assembly of welding gun

Electric heating – Metal heating – By arc

Reexamination Certificate

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Reexamination Certificate

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06924461

ABSTRACT:
A gas diffuser for a welding gun in which atmospheric air in the interior of the liner is substantially prevented from entering the contact tip hole. The gas diffuser includes a cradle having a hole and a section of a concave surface disposed around a periphery of the hole, and an outer peripheral body having a first axial bore on one side of the cradle and a second axial bore on the other side of the cradle. The outer peripheral body includes one or more generally axial slots, each slot having one end that opens into the first axial bore and another end that opens into the second axial bore. Each slot is open to the exterior of the diffuser along its length and is disposed radially outward of the cradle. The first and second axial bores communicate via the hole in the cradle and via the slots.

REFERENCES:
patent: 4529863 (1985-07-01), Lebel
patent: 4572942 (1986-02-01), Church
patent: 6225599 (2001-05-01), Altekruse
patent: 6444950 (2002-09-01), Altekruse et al.
patent: 6525297 (2003-02-01), Doherty
patent: 6720528 (2004-04-01), Matiash et al.
patent: 6744013 (2004-06-01), Jones
patent: 6847009 (2005-01-01), Stuart et al.
patent: 6852950 (2005-02-01), Giese
patent: 2002/0113046 (2002-08-01), Altekruse et al.
patent: 2002/0113047 (2002-08-01), Doherty
patent: 2004/0026394 (2004-02-01), Giese
U.S. Appl. No. 10/215,804, filed Aug. 9, 2002, Giese.

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