Self-contained integrated welder/generator and compressor

The invention refers to an integrated welder, generator and compressor unit (200;310) that includes a housing (210;320) that at least partially contains components of a welder, generator and compressor. An engine (250;350), an electric current generator(260;360), and an air compressor (280;380)are at least partially mounted in the housing. The electric current generator is at least partially connected to the engine to be at least partially driven thereby. A drive connector at least partially connects the air compressor to the engine and/or electric current generator. The drive connector includes a gear box (270;370) that has at least one gear.