Golf-ball-cover casting molds with self-centering mold-cavity inserts
View Patent ↗Molds are disclosed for forming golf-ball covers by casting. An exemplary mold includes first and second support members that are placeable in face-to-face opposition to each other. At least one respective mold-cavity insert, defining a respective hemispherical cavity, is mounted to each support member. The mold-cavity insert is floatable in at least three (e.g., x, y, z) degrees of freedom relative to the respective support member. Each mold-cavity insert on the first support member is in face-to-face opposition to a respective mold-cavity insert on the second support member whenever the support members are in face-to-face opposition to each other, such that the respective hemispherical cavities of each opposing pair of inserts form respective spherical ball-cover cavities. A respective z-direction bias is associated with each mold-cavity insert. Also, a respective self-centering device is associated with each opposing pair of inserts. The self-centering device urges movement of at least one mold-cavity insert of the opposing pair in any of at least three degrees of freedom as required to center the mold-cavity inserts of the opposing pair with each other.
1. A mold-half of a golf-ball-cover casting mold, the mold-half comprising: a support member extending in x- and y-directions; at least one mold-cavity insert defining a respective, individual, substantially hemispherical ball-cover cavity; a respective mounting that couples each mold-cavity insert to the support member, the mounting providing individual floatability of the respective mold-cavity insert, relative to the support member, in at least x, y, and z degrees of freedom; and each mold-cavity insert comprising a respective self-centering device that is engageable with a corresponding self-centering feature of a mating mold-cavity insert on a facing support member to urge movement of the respective mold-cavity insert in any of the at least x, y, and z degrees of freedom as required to self-center the respective mold-cavity insert automatically with the mating corresponding mold-cavity insert, the self- centering motion of the respective mold-cavity insert being independent of such motion of any other mold-cavity insert mounted to the support member.
2. The mold-half of claim 1 , further comprising a bias situated between the mold-cavity insert and the support member.
3. The mold-half of claim 2 , wherein the bias is a z-direction bias.
4. The mold-half of claim 3 , wherein the z-direction bias comprises a compression spring.
5. The mold-half of claim 1 , wherein:
the support member comprises a plate defining, for each mold-cavity insert, a respective cylindrical bore extending in a z-direction into the support member; and
the mold-cavity insert is situated in the respective bore with sufficient clearance to provide the floatability of the respective mold-cavity insert in the at least x, y, and z degrees of freedom.
6. The mold-half of claim 1 , wherein:
the self-centering device comprises at least one pin insertable into a respective hole and at least one hole into which a respective pin is insertable; and
the corresponding self-centering feature of the mating mold-cavity insert comprises a respective hole into which the pin of the self-centering device is insertable, and a respective pin insertable into the hole of the self-centering device.
7. The mold-half of claim 1 , wherein the self-centering device comprises at least one projection having a sloped surface that engages a substantially complementary sloped surface on the mating mold-cavity insert.
8. A mold for casting a golf-ball cover, comprising:
first and second support members that extend in respective x and y directions and that are placeable in face-to-face opposition to each other;
at least one respective mold-cavity insert, defining a respective, individual, substantially hemispherical cavity, mounted to each support member so as to provide at least one mating pair of mold-cavity inserts per mold, the mating pair being in face-to-face opposition to each other whenever the support members are in face-to-face opposition to each other such that the respective substantially hemispherical cavities of each mating pair form a respective spherical ball-cover cavity;
at least one mold-cavity insert of each mating pair being individually floatable in at least x, y, and z degrees of freedom relative to the respective support member;
each floatable mold-cavity insert comprising a respective z-direction bias of the mold-cavity insert relative to the respective support member; and
each mating pair of mold-cavity inserts comprising a respective self-centering device that urges movement of at least one mold-cavity insert of the mating pair in any of the at least x, y, and z degrees of freedom as required to self-center the mold-cavity inserts of the mating pair automatically with each other when the first and second support members are brought together face-to-face, the self-centering motion of the at least one mold-cavity insert being independent of self-centering motion of any other mating pair of mold-cavity inserts mounted to the support members.
9. The mold of claim 8 , wherein:
both mold-cavity inserts of each mating pair are floatable in at least the x, y, and z degrees of freedom relative to the respective support member; and
both mold-cavity inserts of each mating pair include a respective z-direction bias.
10. A mold for casting a golf-ball cover, comprising:
first and second support members that extend in respective x and y directions and that are placeable in face-to-face opposition to each other;
at least one respective mold-cavity insert, each defining a respective, individual, substantially hemispherical cavity, mounted to each support member to form a respective mating pair of mold-cavity inserts per mold, each mold-cavity insert being individually floatable in at least x, y, and z degrees of freedom relative to the respective support member, the individual floatability being independent of respective floatability of any other mold-cavity inserts mounted to the respective support member;
each mold-cavity insert on the first support member being in face-to-face opposition to a respective mold-cavity insert on the second support member whenever the support members are in face-to-face opposition to each other such that the respective substantially hemispherical cavities of each opposing pair of inserts form respective spherical ball-cover cavities;
a respective z-direction bias associated with each mold-cavity insert; and
a respective self-centering device, associated with each opposing pair of inserts, urging movement of at least one mold-cavity insert of the opposing pair in any of the at least x, y, and z degrees of freedom as required to self-center the mold-cavity inserts of the opposing pair automatically with each other as the first and second support members are brought together face-to-face, the self-centering motion being independent of self-centering motion of any other mold-cavity insert mounted to either support member.
11. The mold of claim 10 , wherein the z-direction bias comprises a compression spring.
12. The mold of claim 10 , wherein:
each support member comprises a respective plate defining respective cylindrical bores for the respective mold-cavity inserts; and
each mold-cavity insert is situated in the respective bore with sufficient x-y and z clearance to provide the floatability of the mold-cavity insert in x, y, and z degrees of freedom.
13. The mold of claim 12 , wherein:
each mold-cavity insert comprises a cylindrical portion and a flange defining respective a shoulder;
each bore comprises a cylindrical portion and a respective shoulder;
the x-y clearance is diametrical clearance of the cylindrical portion of the insert relative to the cylindrical portion of the bore; and
the z clearance is determined, at least in part, by clearance between the shoulders.
14. The mold of claim 13 , wherein the z-direction bias is situated between the shoulders.
15. The mold of claim 14 , wherein the z-direction bias comprises a spring-washer.
16. The mold of claim 12 , wherein, with respect to each opposing pair of mold-cavity inserts, the self-centering device comprises at least one pin on a first mold-cavity insert and at least one complementary hole on a second mold-cavity insert of the opposing pair.
17. The mold of claim 12 , wherein, with respect to each opposing pair of mold-cavity inserts, the self-centering device comprises, on a first mold-cavity insert of the pair, at least one projection having a sloped side that engages a complementary sloped side on a projection of the second mold-cavity insert.
18. The mold of claim 12 , wherein, with respect to each opposing pair of mold-cavity inserts, each mold-cavity insert comprises a respective parting surface, the parting surfaces being contact surfaces of the mold-cavity inserts of the opposing pair whenever the support members are in face-to-face opposition to each other.
19. The mold of claim 18 , wherein, with respect to each opposing pair of mold-cavity inserts, the z-direction bias urges the parting surfaces together whenever the support members are in face-to-face opposition to each other.
20. The mold of claim 18 , wherein, with respect to each opposing pair of mold-cavity inserts, the respective self-centering device associated with each opposing pair of inserts comprises a first portion adjacent the parting surface of one mold-cavity insert, and a second portion, complementary to the first portion, adjacent the parting surface of the other mold-cavity insert.
21. The mold of claim 12 , wherein the first and second support members are coupled together in a manner rendering them placeable in face-to-face opposition to each other.
22. The mold of claim 12 , wherein each of the first and second support members includes multiple respective mold-cavity inserts.