Patent ID: 8319139

Claim:
A bore welding mechanism comprising: a casing having spindle bushings rotationally and axially supporting a rotatable and axially translatable spindle for supporting a bore repair mechanism in alignment with a bore, the spindle having an axially extending keyway and a worm gear thread extending for at least a part of a length of the spindle and including a spindle drive gear coupled to the spindle by a drive key engaging with the keyway of the spindle so that the spindle is rotationally fixed to the spindle drive gear and axially translatable with respect to the spindle drive gear, and a drive shaft extending through the casing transversely to and offset from an axis of the spindle and including a drive shaft worm gear rotationally fixed to the drive shaft and engaged with the spindle drive gear to rotate the spindle drive gear and the spindle by rotation of the drive shaft.