Mould device for producing by casting an anti-skid element to be fastened into the tread of a vehicle tire

Claim 1

A MOULD DEVICE FOR PRODUCING BY INJECTION MOULDING ANTI-SKID ELEMENTS ADAPTED TO BE FASTENED INTO THE TREAD OF A VEHICLE TIRE, SAID ANTI-SKID ELEMENT HAVING AN ELONGATED CORE OF HARD MATERIAL EMBEDDED IN A MAIN PART OF SOFTER MATERIAL; SAID MOULD DEVICE COMPRISING TWO MOULD HALVES CONTACTING EACH OTHER ALONG A DIVIDING LINE, EACH SAID MOULD HALF DEFINING ONE HALF OF A MOULD CHAMBER BEING SYMMETRICAL WITH RESPECT TO SAID DIVIDING LINE, THE TWO HALVES OF SAID MOULD CHAMBER BEING ALIGNED, A LEADING DUCT PROVIDED IN SAID MOULD HALVES FOR SEATING AND POSITIONING THE ELONGATED CORE OF HARD MATERIAL SYMMETRICALLY TO SAID DIVIDING LINE AND SUCH THAT AT LEAST A PORTION OF SAID CORE PENETRATES SAID CHAMBER THROUGH ONE END THEREOF, SAID MOULD HALVES COMPRISING AT LEAST ONE MOULD PORTION HAVING MORE THAN TWO SPACED RADIAL EXTENSIONS FACING TOWARD THE LONGITUDINAL AXIS OF SAID ELONGATED CORE AND HAVING INNER ENDS OF SMALL DIMENSION IN RELATION TO THE PERIPHERAY OF SAID CORE, SAID ENDS POSITIONED TO CONTACT SAID CORE BETWEEN ITS ENDS AND THEREFORE FORMING A SUPPORT LOCATION TO PREVENT LATERAL MOVEMENT OF SAID CORE DURING INJECTION MOULDING, SPACES PROVIDED BETWEEN SAID EXTENSIONS SHAPED TO MOUND SPACED VERTICAL RIBS IN THE MAIN PART OF SOFTER MATERIAL, AND AN INJECTION PASSAGE PROVIDED IN SAID MOULD HALVES WHICH COMMUNICATION WITH THE OTHER END OF SAID CHAMBER.