Device for supporting and moving a tool within a tapping

Claim 1

Device for supporting and moving a tool within a substantially horizontal tapping having a symmetry of revolution and traversing a wall so as to be flush with one side of said wall and project from the other side of said wall, said device comprising (a) supporting and centering means in the form of a star, the arms of which extend radially with respect to the tapping; (b) centering members carried by said arms for engagement within said tapping; (c) means for fastening to the wall on the flush side of the tapping supported by the ends of said arms remote from said tapping; (d) a cylindrical centering bell at the projecting end of said tapping and within the latter, said bell supporting a fluid-tight seal on its outer surface; (e) end bearings carried by said supporting means and said centering bell, said end bearings having an axis common with the axis of said tapping; (f) a tool holder bar connected at its ends to two stub shafts aligned along the axis of said tapping, each of said stub shafts being rotatable in one of said end bearings, said tool holder bar being off-set with respect to the axis of said tapping in a radial direction; (g) means for rotating said tool holder bar about the axis of the tapping; and (h) means carried by said tool holder bar for guiding and moving a tool in axial direction and in radial directions of the tapping.