To provide a die for molding a golf ball, and a method for manufacturing the golf ball using the die which, particularly in forming an outermost layer of a cover of the golf ball, can stably hold a core spherical body in a cavity and vent gas well when a cover forming material is injected into the cavity, minimizing appearance defects and the formation of troublesome burrs to attain stable molding without causing production trouble.
The die for molding the golf ball includes a die body formed by separably joining a plurality of divided molds having at least a parting surface with an equator line of the golf ball as a parting reference line and having a cavity protrusively provided with a large number of dimple forming protrusions on the inner wall surface, and a support pin protrusively provided with a plurality of dimple forming protrusions on the tip surface and retractable from the cavity. The support pin advances into the cavity to support the core spherical body, and in the retreated state, the tip surface of the support pin composes a part of the internal wall surface of the cavity. The tip surface of the support pin includes a pole of the cavity, and its peripheral edge intersects a parallel of latitude at 10 degrees from the pole. An excellent molded product can thereby be easily and surely obtained without causing problems such as appearance defects and the formation of nonuniform burrs, thereby contributing to improvement in golf ball productivity.
SATO KATSUNORI
OMURA YOICHI
| US0612981A | 1898-10-25 |
Saori Shigematsu
Katsunari Kobayashi
Takeshi Ishikawa