Claims
- 1. The process of making a bowling pin, comprising the steps of
- a. molding, against a mold wall of general bowling pin shape, a thermoset polymer foam plastic and causing or permitting such plastic to cure, thereby to form a foam cell core having a skin,
- b. withdrawing such core from such mold,
- c. physically removing at least the greater part of such skin, whereby to open cells formed against such mold wall,
- d. then positioning the core in a larger cavity mold, and
- e. pouring a non-foaming plastic therein about such core,
- whereby such non-foaming plastic extends inward into and fills such opened cells,
- f. then curing the non-foaming plastic or permitting it to cure, and then
- g. removing from such larger cavity mold,
- whereby such fill of such opened cells avoids separation of such shell from such core attendant to impacts on bowling pin use.
- 2. The process of making a bowling pin as defined in claim 1,
- together with the additional steps, taken after step c, of checking the core, with its skin so removed, for concentricity, and in event of lack of concentricity, discarding such core and repeating steps a, b and c with another core.
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a continuation-in-part of application Ser. No. 08/290,211 filed Aug. 15, 1994, now abandoned, which was a continuation-in-part of both U.S. Pat. No. 5,354,239, issued Oct. 11, 1994 on application Ser. No. 08/079,040, filed Jun. 21, 1993, and of Ser. No. 08/105,364, filed Aug. 11, 1993, abandoned; both continuations-in-part of application Ser. No. 07/735,001, filed Jul. 22, 1991, abandoned; which was a continuation-in-part of application Ser. No. 07/438,048, filed Nov. 20, 1989, abandoned; which was a continuation-in-part of application Ser. No. 07/294,654, filed Jan. 9, 1989, abandoned.
US Referenced Citations (23)
Foreign Referenced Citations (2)
Number |
Date |
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974717 |
Sep 1975 |
CAX |
1058307 |
Feb 1967 |
GBX |
Related Publications (2)
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Number |
Date |
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105364 |
Aug 1993 |
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735001 |
Jul 1991 |
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Continuation in Parts (4)
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Number |
Date |
Country |
Parent |
290211 |
Aug 1994 |
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Parent |
79040 |
Jun 1993 |
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Parent |
438048 |
Nov 1989 |
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Parent |
294654 |
Jan 1989 |
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