Bowling pin and manufacturing method of the same
AssigneeHamamatsu Kenma Co., Ltd
InventorNobufumi Suzuki
Life of this patent
Estimating the term…
Abstract
The present invention provides a bowling pin which exhibits the excellent durability while satisfying conditions required on the bowling pin such as a weight and a dry sound which is generated at the time of hitting. A hollow portion which extends in the vertical direction is formed in a core material which constitutes a bowling pin. Upper and lower end portions of the hollow portion are opened, wherein one cap is fitted into an opening and another cap is fitted into a lower-side opening. The whole of the core material and the cap are almost covered with a surface skin portion and a portion of the core material where the surface skin portion is not provided is formed of two line portions and a dial portion. The surface skin portion is white, the line portions are red and the dial portion is black.
Claims12
A bowling pin comprising:
- a core material made of synthetic resin and having a hollow portion, the hollow portion having upper and lower opening portions;
- caps fitted in the opening portions;
- and a surface skin portion made of hard synthetic resin which is molded on a surface of the core material and covers that one of said caps that is in said upper opening portion.
A method of manufacturing a bowling pin, said method comprising:
- forming a core material having a hollow portion by injection molding, the hollow portion having upper and lower opening portions;
- fitting a deformation preventing material the inside of the upper opening portion of the hollow portion;
- setting the core material in a mold;
- and forming a surface skin portion made of a synthetic resin on the core material and the deformation preventing material by molding.
A method of manufacturing a bowling pin, said method comprising:
- forming a core material having a hollow portion by injection molding, the hollow portion having upper and lower opening portions;
- fitting a deformation preventing material the inside of the upper opening portion of the hollow portion;
- setting the core material in a mold;
- and forming a surface skin portion made of a synthetic resin on the core material and the deformation preventing material by molding, said method further comprising forming a projected display body on a surface of the core material using a synthetic resin before said step of forming the surface skin portion by molding, and wherein the surface skin portion is formed such that the display body is exposed.
A method of manufacturing a bowling pin, said method comprising:
- forming a core material having a hollow portion by injection molding, the hollow portion having upper and lower opening portions;
- fitting a deformation preventing material the inside of the upper opening portion of the hollow portion;
- setting the core material in a mold;
- and forming a surface skin portion made of a synthetic resin on the core material and the deformation preventing material by molding, said method further comprising:
- forming a recessed portion on the surface skin portion;
- and forming a display body of synthetic resin within the recessed portion.
Dependencies are inferred from the claim text.