Abstract: A metal mold for tire vulcanization comprising a tread pattern mold obtained by piling up and fixing a plurality of laminas in order; the laminas have molding portions corresponding to sectional shapes of a tread portion or an outer surface of a tire, the sectional shapes are obtained by slicing a tire in lamina-shape parallel to an equator plane of the tire.The metal mold of the present invention can be manufactured efficiently since the provision of working data and the working become easy. Furthermore, the mending of the metal mold resulting from partial defects and the partial change of the metal mold are easy since the metal mold of the present invention is not an integral but laminate construction.

Abstract: The present invention relates to snow tire spikes for use with automobiles adapted to run on frozen road surfaces or on snow. The snow tire spike comprises a spike body formed by using a ceramic stock molded by pressing with dies and a flange made of plastics which coats at least the end part of the spike body which is attached to the tire. The anchoring part formed at the attaching end of the spike body has a larger diameter than the opposite end of the spike body, but has a diameter smaller than 1.5 times that of the latter. This larger diameter part is wholly coated with plastics, and is unified with the outer circumferential part of the spike body through a smoothly tapered or arc-shaped joining surface.