Title:
MOLD FOR MOLDING GOLF BALL
Document Type and Number:
Japanese Patent JP3578180
Kind Code:
B2
Abstract:
PURPOSE: To simply demold a molded golf ball without damaging the same by arranging an ejector pin in a through-hole of which the projection area from a cavity surface is specific in a movable manner so as to allow the same to advance to and retreat from a cavity.
CONSTITUTION: The large diameter through-hole 3 communicating with a cavity 2 is provided to the central part of a lower mold 1a and an ejector pin 3 is arranged in the through-hole 3 in a movable manner so as to advance to and retreat from the cavity 2. The projection area from the cavity surface of the through-hole 3 is 3-50% of the projection area of the cavity part. A golf ball 5 is produced by clamping the lower and upper molds of this mold in such a state that the leading end of the ejector pin 4 coincides with the cavity surface of the lower mold 1a to form the cavity surface continuously to supply a molding material into the cavity 2 to mold the same. Subsequently, the upper and lower molds are separated and the ejector pin 4 is advanced to release and demold the golf ball 5.
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Inventors:
Takehiko Yamaguchi
Application Number:
JP16142495A
Publication Date:
October 20, 2004
Filing Date:
June 05, 1995
Export Citation:
Assignee:
Bridgestone Sports Co., Ltd.
International Classes:
A63B45/00; B29C33/42; B29C33/44; B29C45/40; B29C45/42; B29L31/54; (IPC1-7): B29C33/42; A63B45/00; B29C33/44; B29C45/42
Domestic Patent References:
| JP5104592A | ||||
| JP50140973U |
Attorney, Agent or Firm:
Takashi Kojima