Fume extracting welding gun nozzle

Claim 2

In a torch for use in welding during which smoke or fumes are created, and having a nozzle through which welding current is delivered to a workpiece, the improvement in said nozzle comprising a first member having an end which may be placed in a region where smoke or fumes are generated, said member including means defining a first passageway therethrough, a second member coaxial with and surrounding said first member and spaced radially therefrom along an axis to define therebetween a chamber into which smoke or fumes may be drawn, said second member having an end spaced from the end of said first member along said axis, means on said first member positioned between the end of said second member and the end of said first member and extending radially outward from said axis to a distance substantially equal to the distance of radial spacing of said second member so as to define a substantially continuous opening forming the sole interconnection from external of said nozzle to said chamber and formed between the end of said second member and the means extending outward on said first member, means for connecting a source of negative pressure to said chamber to induce air flow into said opening thereby to remove smoke and fumes from a region laterally outwardly of said opening.

Claim 3

The torch of claim 1 wherein said first and second members are cylindrical.

Claim 4

The torch of claim 1 wherein said first member is frusto-conical in configuration and wherein said means on said first member extending outwardly therefrom is an annular ridge.

Claim 5

The torch of claim 1 for use in welding wherein said first member includes a nozzle ring supported from said second member by spacer rods, a guide tube including passageways for supplying shielding gas and welding wire, said guide tube carrying electrical current to said welding wire, and an insulator member extending between said guide tube and said nozzle ring whereby shielding gas and welding wire may be directed into a weld while being isolated from the smoke or fumes drawn into said chamber, and whereby said nozzle ring is electrically insulated from said guide tube.

Claim 6

A nozzle for use in operation where smoke or fumes are created, said nozzle comprising a first member having an end which may be placed in the region where smoke or fumes are created, said first member including means defining a first passageway therethrough, a second member coaxial with and surrounding said first member and spaced radially therefrom along an axis to define therebetween a chamber into which smoke or fumes may be drawn, said second member having an end spaced from the end of said first member along said axis, means positioned between the end of the second member and the end of the first member and extending outwardly from said first member a distance substantially equal to the distance of radial spacing of said second member so as to form between the end of said second member and the means extending outwardly on said first member a substantially continuous opening formiNg the sole interconnection from external of said nozzle to said chamber, and means for connecting said chamber to a source of negative pressure whereby air flow into said opening will remove smoke or fumes from a region laterally outwardly of said opening.

Claim 7

A nozzle for use in operation where smoke or fumes are created, said nozzle comprising a first member having an end which may be placed in the region where smoke or fumes are created, said first member including means defining a first passageway therethrough, a second member coaxial with and surrounding said first member and spaced radially therefrom along an axis to define therebetween a chamber into which smoke or fumes may be drawn, said second member having an end spaced from the end of said first member along said axis, means positioned between the end of the second member and the end of the first member and extending outwardly from said first member a distance substantially equal to the distance of radial spacing of said second member so as to form between the end of said second member and the means extending outwardly on said first member a substantially continuous opening formiNg the sole interconnection from external of said nozzle to said chamber, and means for connecting said chamber to a source of negative pressure whereby air flow into said opening will remove smoke or fumes from a region laterally outwardly of said opening.

Claim 8

The nozzle of claim 5 further including a contact tip within said first passageway for directing welding wire into a weld, and means for connecting said contact tip to a source of electrical current whereby current is provided to said welding wire as it exits said contact tip.

Claim 9

The nozzle of claim 5 wherein said first member further includes a second passageway through which shielding gas may be provided to the region of the weld.

Claim 10

In a torch for use in welding during which smoke or fumes are created, and having a nozzle through which welding current is delivered to a workpiece, the improvement in said nozzle comprising a first member having an end which may be placed in a region where smoke or fumes are generated, said member including means defining a first passageway therethrough, a second member coaxial with and surrounding said first member and spaced radially therefrom along an axis to define therebetween a chamber into which smoke or fumes may be drawn, said second member having an end spaced from the end of said first member along said axis, means on said first member positioned between the end of said second member and the end of said first member and extending radially outward from said axis to a distance substantially equal to the distance of radial spacing of said second member so as to form between the end of said second member and the means extending outwardly on said first member a substantially continuous opening forming the sole interconnection from external of said nozzle to said chamber, and means for connecting a source of negative pressure to said chamber to induce air flow into said opening thereby to remove smoke and fumes from a region laterally outwardly of said opening.

Claim 11

In a torch for use in welding during which smoke or fumes are created, and having a nozzle through which welding current is delivered to a workpiece, the improvement in said nozzle comprising a first member having an end which may be placed in a region where smoke or fumes are generated, said member including means defining a first passageway therethrough, a second member coaxial with and surrounding said first member and spaced radially therefrom along an axis to define therebetween a chamber into which smoke or fumes may be drawn, said second member having an end spaced from the end of said first member along said axis, means on said first member positioned between the end of said second member and the end of said first member and extending radially outward from said axis to a distance substantially equal to the distance of radial spacing of said second member so as to form between the end of said second member and the means extending outwardly on said first member a substantially continuous opening forming the sole interconnection from external of said nozzle to said chamber, and means for connecting a source of negative pressure to said chamber to induce air flow into said opening thereby to remove smoke and fumes from a region laterally outwardly of said opening.

Claim 12

In a torch for use in welding during which smoke or fumes are created, and having a nozzle through which welding current is delivered to a workpiece, the improvement in said nozzle comprising a first member having an end which may be placed in a region where smoke or fumes are generated, said member including means defining a first passageway therethrough, second member coaxial with and surrounding said first member and spaced radially therefrom along an axis to define therebetween a chamber into which smoke or fumes may be drawn, means defining a substantially continuous opening into said chamber from the entire region laterally surrounding said second member, said opening facing predominantly outwardly to the sides of said nozzle and forming the sole passage into said chamber from the exterior of said nozzle, means for connecting a source of negative pressure to said chamber to induce air flow into said opening from the entire region around said opening, and an annular ring on said nozzle located rearwardly from the end of said first member and forward of said opening and extending radially outward with respect to said first member whereby said ring inhibits direct flow of gases between the region of the weld and said opening causing smoke and fumes from said weld first to flow outwardly and then be drawn laterally inwardly through said opening.

Claim 13

In a torch for use in welding during which smoke or fumes are created, and having a nozzle through which welding current is delivered to a workpiece, the improvement in said nozzle comprising a first member having an end which may be placed in a region where smoke or fumes are generated, said member including means defining a first passageway therethrough, second member coaxial with and surrounding said first member and spaced radially therefrom along an axis to define therebetween a chamber into which smoke or fumes may be drawn, means defining a substantially continuous opening into said chamber from the entire region laterally surrounding said second member, said opening facing predominantly outwardly to the sides of said nozzle and forming the sole passage into said chamber from the exterior of said nozzle, means for connecting a source of negative pressure to said chamber to induce air flow into said opening from the entire region around said opening, and an annular ring on said nozzle located rearwardly from the end of said first member and forward of said opening and extending radially outward with respect to said first member whereby said ring inhibits direct flow of gases between the region of the weld and said opening causing smoke and fumes from said weld first to flow outwardly and then be drawn laterally inwardly through said opening.