Barbed metal insert overmolding using crosslinked polymers
View Patent ↗The invention described herein relates to method by which a leak-proof connection may be made to a refrigeration device using shape memory characteristics of crosslinking and overmolding to affect the leak-proof connection.
1. A process for securing a house water line to a water distribution system within a refrigeration device comprising the steps of:
overmolding a polymeric attachment means onto a tube at or adjacent one end of said tube, a composition of said overmolded polymeric attachment means being at least partially chemically compatible with said tube;
crosslinking at least a portion of said tube and said attachment means to set a permanent internal diameter of said tube and shape memory characteristics in said portion;
inserting a shaft of a connector into said tube, an internal diameter (I.D.) of said tube being equal to or smaller than an outer diameter (O.D.) of said shaft; and
applying an external or internal stimulus to at least said portion to contract said tube about said shaft.
2. The process of claim 1 wherein
said external stimulus is a temperature in excess of a transition temperature (T trans ).
3. The process of claim 1 wherein
said internal stimulus is time.
4. The process of claim 1 wherein said step of crosslinking said tube is between 40-90% crosslinking.
5. The process of claim 1 wherein
said shaft of said connector is metallic and further comprises raised retention means.
6. The process of claim 5 wherein
said shaft is selected from the group consisting of stainless steel and brass; and
said retention means is selected from the group of laterally-extending ribs and raised barbs.