Injection mold for golf balls and method for preparing golf balls
First Claim
1. In an injection mold for golf balls comprising a pair of separable mold segments each having an inner surface and a peripheral surface, the mold segments being mated at their peripheral surfaces along a parting line so that their inner surfaces define a spherical cavity, a plurality of dimple-forming projections formed on the inner surfaces of the mold segments, and a plurality of tubular gates disposed in the peripheral surfaces of the mold segments and in fluid communication with the cavity,the improvement wherein at least four gates are disposed, the peripheral surfaces of the mold segments are corrugated except for the areas where the gates are disposed, and dimple-forming projections are disposed at the corrugations so as to lie across the parting line.
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Abstract
An injection mold for golf balls includes a pair of separable mold segments (1a, 1b). The mold segments (1a, 1b) are mated at their peripheral surfaces (12) along a parting line so that their inner surfaces (2a) define a spherical cavity (2). A plurality of dimple-forming projections (11) are formed on the inner surfaces (2a). At least four tubular gates (7) are disposed in the peripheral surfaces (12) and in fluid communication with the cavity (2). The peripheral surfaces (12) are furrowed except for the areas where the gates are disposed. Dimple-forming pins (14) are received in furrows (13) so as to lie across the parting line (PL). A molten stock material is injected into the cavity (2) through the gates (7) to mold a golf ball having dimples lying across the parting line.
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Citations
13 Claims
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1. In an injection mold for golf balls comprising a pair of separable mold segments each having an inner surface and a peripheral surface, the mold segments being mated at their peripheral surfaces along a parting line so that their inner surfaces define a spherical cavity, a plurality of dimple-forming projections formed on the inner surfaces of the mold segments, and a plurality of tubular gates disposed in the peripheral surfaces of the mold segments and in fluid communication with the cavity,
the improvement wherein at least four gates are disposed, the peripheral surfaces of the mold segments are corrugated except for the areas where the gates are disposed, and dimple-forming projections are disposed at the corrugations so as to lie across the parting line.
Specification
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- Resources
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Current AssigneeBridgestone Sports Co Limited (Bridgestone Corporation)
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Original AssigneeBridgestone Sports Co Limited (Bridgestone Corporation)
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InventorsShimosaka, Hirotaka, Inoue, Michio, Kasashima, Atsuki, Ihara, Keisuke, Masutani, Yutaka
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Primary Examiner(s)Mackey, James P.
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Application NumberUS08/961,016Time in Patent Office481 DaysField of Search425/116, 425/120, 425/129.1, 425/570, 425/573, 264/275, 264/279, 264/279.1, 264/328.1, 264/328.8US Class Current264/279CPC Class CodesB29C 45/14819 the inserts being completel...
