Hollow plastic pin with varying wall thickness

Details Hollow plastic pin with varying wall thickness Hollow plastic pin with varying wall thickness

1995-06-02

1996-10-29

Pierce, William M.

Games using tangible projectile

Bowling

Pin

473119, A63D 900

Patent

active

055690939

ABSTRACT:
A plastic pin, including a bowling pin, for bowling lanes, and a method of making the same. The pin has a hard shell that surrounds a core of cellular and/or porous material. The shell has a lower bulging portion, thereabove a neck-like reduced diameter portion and thereabove an again slightly wider head. The shell has a wall thickness that from the greatest diameter part of the bulging portion increases gradually both upwardly toward the reduced diameter portion and downwardly toward a base of the pin. The plastic for the core of the pin is introduced into the hollow interior of the shell and fills at least a portion thereof by expansion. The core plastic is introduced at such a temperature that an inner surface of the plastic shell is softened at least at some locations by contact with the introduced core plastic to thereby effect fusion between the plastic of the shell and the introduced core plastic.

REFERENCES:
patent: 3971837 (1976-07-01), Hasegawa et al.

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