Metal build-up apparatus with improved cooling means

A cooling apparatus in a re-building welding machine for track rollers, said apparatus comprising:

• a track roller shaft,
• a lubrication oil passage bore extending axially in said shaft and opening at one end thereof,
• said track roller shaft further comprising axially spaced, radial oil passage branch bores opening to said axial bore, and being in fluid communication with the track roller at their radial outboard ends,
• a first contact joint,
• means for coupling said first contact joint to the open end of said track roller shaft,
• said first contact joint having cooling medium inlet and outlet ports formed therein;
• a second contact joint for cooperative axial contact with said first contact joint;
• plunger means for rotatably and axially movably supporting said second contact joint to effect contact between said first and second contact joints;
• an intake tube having at its end a valve body sealably fitted to the inner surface of said oil passage bore when said first contact joint is coupled to the open end of said shaft, said intake tube being connected to said first contact joint in communication with said inlet port;
• said first contact joint including an intake/exhaust sleeve including an intake terminal and an exhaust terminal in respective communication with said inlet and outlet ports, and wherein the length of said intake tube is such that when said first contact joint is coupled to the open end of said shaft, said valve body is positioned within said oil passage bore between said radial oil passage branch bores;
• whereby cooling medium may be fed through said intake terminal by means of said intake/exhaust sleeve and circulated through said track roller for cooling of said track roller during welding rebuilding.