Plastic pin

Abstract

A plastic pin having a porous and/or cellular core that is surrounded by a resilient shell is provided. The base of the pin is made of a different material than is the shell. The base is centrally provided with a plug that projects into the core. To improve the connection between the shell and the base, the outer side of the plug is provided with projections that form a positive connection with the core.

What I claim is:  
     
         1 . A plastic pin, comprising: 
 a resilient shell that surrounds a core of porous and/or cellular material;    a base that adjoins said shell and provides a support surface for the pin, wherein said base is made of a material that differs from the material of said shell, and wherein said base is provided with a central bore; and    a plug that extends into said shell from a rim region of said central bore, wherein an outer side of said plug is provided with at least one projection to provide a positive connection with said core.    
     
     
         2 . A pin according to  claim 1 , wherein said at least one projection has a saw toothed cross-sectional configuration, wherein a portion of said projection that faces said base extends further from said plug than does a portion of said projection that faces from away said base.  
     
     
         3 . A pin according to  claim 1 , wherein a plurality of annular projections are distributed over a length of said plug.  
     
     
         4 . A pin according to  claim 1 , wherein venting bores are disposed in said base.  
     
     
         5 . A pin according to  claim 1 , wherein said plug has an at least partially conical configuration, with a larger diameter portion of said plug being disposed at a free end of said plug and forming said at least one projection thereof.  
     
     
         6 . A pin according to  claim 1 , wherein said base is provided with a circumferential flange for centering said shell on said base.  
     
     
         7 . A pin according to  claim 1 , wherein said base is provided with a projecting rim that engages an associated rim of said shell in a hook-like or tongue and groove manner.  
     
     
         8 . A pin according to  claim 1 , wherein said plug is monolithically formed with said base and extends essentially perpendicular to said base.