Abstract: Apparatus for connecting the sole of a shoe with its shaft comprising a mold having a contour corresponding to the shape of the sole and at least two jaws being movably supported and being arranged for being pressed against the mold and for laterally enclosing the mold so as to bend an edge portion of the shaft against the side of the mold, said jaws being provided with rims extending in an inward direction and overlapping the edge of the mold over its total circumference, said rims having a smaller height as compared with the width of the protruding and bent edge of the shaft, and a press ram cooperating with the mold and having a contour approximately corresponding to the border line, facing the center of the mold, of the rims of the jaws, the mold and the press ram being formed as electrodes connected to a radio frequency generator.

Abstract: Process and apparatus for connecting the sole of a shoe with its shaft, the sole and the shaft consisting at least partially of thermoplastic synthetic resin, wherein the shaft is placed over a mold corresponding in shape to the shape of the sole, an edge of the shaft protruding over the mold and the shaft being expanded in longitudinal direction of the mold, and wherein subsequently the protruding edge of the shaft is bent over the mold and the sole is pressed against the mold and welded with the bent edge by means of radio frequency.