Title:
ゴルフボール用成形型及びゴルフボール製造方法
Document Type and Number:
Japanese Patent JP4327564
Kind Code:
B2
Abstract:
A mold comprises a spherical cavity, a support pin capable of being moved forward and backward with respect to the cavity, and a vent pin (8). The vent pin (8) includes two slits (S), an annular groove (20) and a vertical groove (22). An upper end (24) of the slit (S) is opened toward the cavity. A lower end (26) of the slit (S) is opened toward the annular groove (20). The annular groove (20) is coupled to the vertical groove (22). The lower end of the vertical groove (22) is opened toward air. A width (W) of the slit (S) is preferably equal to or greater than 1 μm, is more preferably equal to or greater than 3 μm, and is particularly preferably equal to or greater than 5 μm. A depth (D) of the slit (S) is preferably equal to or greater than 10% of a diameter (φ), is more preferably equal to or greater than 15% of the diameter (φ), and is particularly preferably equal to or greater than 20% of the diameter (φ). It is preferable that the same slit (3) should be formed on the support pin.
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Inventors:
Seiichiro Endo
Masatoshi Yokota
Miyuki Nakai
Satoshi Tanaka
Masatoshi Yokota
Miyuki Nakai
Satoshi Tanaka
Application Number:
JP2003381921A
Publication Date:
September 09, 2009
Filing Date:
November 12, 2003
Export Citation:
Assignee:
sri sports corporation
International Classes:
A63B45/00; B29C33/10; B29C39/10; B29C45/14; B29C45/34; B29L31/54
Domestic Patent References:
| JP7080848A | ||||
| JP2003266440A | ||||
| JP2003190332A | ||||
| JP2000037480A |
Attorney, Agent or Firm:
Kengo Oka