NON-CIRCULAR VENT PIN FOR GOLF BALL INJECTION MOLD AND GOLF BALL FORMED THEREFROM

摘要

An improved vent pin for a golf ball injection mold is characterized by a no n- circular configuration so that a non-circular dimple (P) can be formed at on e or both poles of the golf ball. The vent pin is coaxially arranged within a passage in the injection mold which is aligned with a radius of the ball whi ch passes through one of the poles thereof. The pin is operable between a norma l position where the end of the pin closes the passage lower end and a retract ed position where the pin end is withdrawn into the passage so that air from a cavity of the mold where the cover layer of the ball is formed can be vented during delivery of thermoplastic material to the cavity to form the golf bal l cover.