Method of moulding soles on shoe uppers, a shoe welt and a mould for carrying out the method

A method for moulding soles of a plastic material, and shoe welts on shoe uppers by use of a mould so as to provide a finished shoe with a welted appearance, said mould including a last, upon which a shoe upper is arranged, an upper mould part divided along a longitudinal middle plane and thus including two halves being laterally movable in relation to a lower mould part between an open and a closed mould position, and a lower mould part being vertically movable in relation to the upper mould part between an open and a closed mould position, said method comprising:

• A—an annular welt is provided having an inner outline substantially corresponding to an outer outline of the lower side section of the shoe upper which corresponds to the position of the welt on the finished shoe, said welt being attached along an edge of a relatively thin auxiliary sole which is pervious to the plastic material and assists in keeping the welt in place during the moulding of the sole,
• B—the welt attached to the auxiliary sole is placed in the mould in the open position of the mould,
• C—the two halves of the upper mould part are brought together, whereby an upper projection on each of the halves extends over the welt,
• D—the lower mould part is moved into its closed position by a vertical movement in relation to the upper mould part, a circumferential support face on an upper face of the lower mould part co-acting with a pressure surface on a lower face of the projection on each of the upper mould part halves in such a manner that a portion of the welt facing the shoe upper is tilted inwards and downwards to bring an inner end face of the welt into sealing engagement with a lower side section of the shoe upper and
• E—the shoe sole is moulded by supplying a plastic material to a cavity of the mould before or after the lower mould part is moved into its closed position.