초록 ▼

A torch handle for use with a nozzle which includes a fume extracting orifice to remove fumes generated by welding or cutting includes a conduit within the handle for carrying the fumes to a vacuum pump and means for cooling the handle. In one embodiment, cooling is provided by mixing large quantiti

A torch handle for use with a nozzle which includes a fume extracting orifice to remove fumes generated by welding or cutting includes a conduit within the handle for carrying the fumes to a vacuum pump and means for cooling the handle. In one embodiment, cooling is provided by mixing large quantitites of ambient air with the fumes in the vicinity of the nozzle. In another embodiment of the invention, ambient air is drawn into the handle and over the fume conduit and thereafter mixed with the fumes in the pipe leading to the vacuum pump. In a third embodiment, compressed air is directed into the handle from an internal source and passed over the fume carrying conduit within the handle. In a fourth embodiment, cooling water is passed over the surface of the fume extracting conduit within the handle.

대표청구항 ▼

A torch for use in welding operations during which smoke and/or fumes are created, said torch comprising a welding head having a longitudinal axis and an axial end adjacent which welding occurs, means defining a smoke and/or fume extraction opening in said head extending substantially entirely there

A torch for use in welding operations during which smoke and/or fumes are created, said torch comprising a welding head having a longitudinal axis and an axial end adjacent which welding occurs, means defining a smoke and/or fume extraction opening in said head extending substantially entirely therearound and communicating with the exterior of the head for receiving said smoke and/or fumes, an annular ring on said head located rearwardly of said axial end and forwardly of said opening and extending radially outwardly to inhibit the direct flow of gas from the region of the weld and to cause smoke and/or fumes from the weld first to flow outwardly and then be drawn laterally inwardly into said opening, means defining a chamber within said head connected to said opening for receiving said smoke and/or fumes therefrom, a handle including a forward part connected to said head and a rearward part, an inner conduit extending through said handle and having one end thereof extending into said head, a shielding gas supply conduit within said inner conduit extending at least partially through said handle and having one end thereof extending through said head and provided with a discharge orifice adjacent said axial end of said head, an exhaust jacket extending from said head and surrounding said inner conduit to define therebetween a fume passageway in communication with said chamber within said head, said exhaust jacket and said inner conduit being concentric from said head through at least part of said handle, means for connecting a source of negative pressure to said fume passageway at the rearward part of said handle whereby air flow may be induced into said opening in said head, and means for cooling said exhaust jacket within said handle including a housing surrounding said exhaust jacket and means for directing air through the space between said housing and said exhaust jacket and means for exhausting said air to the exterior of said handle thereby to remove heat from said jacket and said handle.