Hollow plastic pin with varying wall thickness
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United States of America Patent
Stats
-
Oct 29, 1996
Grant Date -
N/A
app pub date -
Jun 2, 1995
filing date -
Oct 5, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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