Pipe joints or couplings – Nonmetal to metal – Internal member
Patent
1984-06-15
1987-05-12
Hoag, Willard E.
Pipe joints or couplings
Nonmetal to metal
Internal member
29447, 294695, 29508, 29516, 264230, 264249, 264322, 285423, B29C 4300, B29C 6500
Patent
active
046644237
ABSTRACT:
A polybutylene tubing coupling and method of making that coupling utilizes a male tubular connector element having the same inside diameter as the major extent of the tubing. A coupling element is provided with stop shoulder at one end and a series of annular radially projecting barbs on its outside diameter which are preferably undercut in the direction of the stop shoulder or tubing end. An end of the tube is treated preferably by heating to enable the material to expand and the tubing end is inserted on or slipped over the male element against the stop shoulder. In such position the treated tubing end is mechanically compressed between two semi-circular dies to cause the material of the treated tubing end to flow around the barbs. Thereafter a metal crimp is placed around the tubing end between the stop shoulder and the next adjacent barb, or over the top of one or all barbs. The tubing connection thus formed is then permitted to cool at ambient temperature for approximately 7 days. During such period approximately 1.8% shrinkage will occur in the polybutylene material forming a tight secure tubing connection.
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