US 5,510,067 AGranted

Method of producing a plastic pin having an insert in a neck portion

OwnerArnold Jager, Andreas Jager +1inventors

InventorsArnold Jager, Andreas Jager, Sebastian Jager

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Abstract

A method of producing a plastic pin, including a bowling pin, having a cellular and/or porous core that is surrounded by a solid-walled, noncellular and nonporous shell. The shell is initially produced as a whole body in a mold. While the material of the shell is not yet hardened and is still deformable, an insert is introduced into the narrowed neck portion of the shell, in a direction axial relative thereto, in such a way that the insert displaces an inner layer of the shell, dividing the hollow interior of the shell into an upper and a lower chamber and producing a fixed connection with the material of the shell. Material for the core, with such material being provided with an expanding agent, is then introduced into the shell, and after the shell and the core have set, the mold is removed.

Claims12

Dependent claims

A method of producing a plastic pin, optionally a bowling pin, having a cellular and/or porous core that is surrounded by a solid-walled, noncellular and nonporous shell, said method including the steps of:

providing a mold;
producing said shell in said mold as an initially hollow body;
while the material of said shell is not yet hardened and is still deformable, inserting into a narrowed neck portion of said shell, in a direction axial relative thereto, an insert in such a way that said insert displaces an inner layer of said shell, divides a hollow interior of said shell into an upper and a lower chamber, and produces a fixed connection with said material of said shell;
thereafter introducing into said shell material for said core thereof, wherein said core material is provided with an expanding agent;
and
after setting of said shell and said core, removing said mold.

3 more elements

Dependencies are inferred from the claim text.