Pipe joints or couplings – Frangible element
Reexamination Certificate
2006-09-19
2006-09-19
Bochna, David (Department: 3679)
Pipe joints or couplings
Frangible element
C285S323000, C285S249000
Reexamination Certificate
active
07108288
ABSTRACT:
A tube fitting for a tube end has a female threaded member that cooperates with a male threaded member. The female member includes a tube gripping device in the form of a gripping ring or ferrule that is attached to the female member by a fungible web. Upon a partial pull-up the female engages a camming surface on the male threaded member and breaks off or separates from the female threaded member to become a separate piece so that the fitting then functions as a single ferrule tube fitting. Additional features include a steep camming angle on the camming surface to cause the ferrule to grip the tube end with a bite-type action and to form a primary seal between the camming surface and a front end of the separated ferrule. The ferrule front end, and optionally the entire female threaded member including the initially integral tube gripping device, are hardened to be at least about 3.3 times harder than the material of the tube end.
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Bennett Mark A.
Williams Peter C.
Bochna David
Calfee Halter & Griswold LLP
Swagelok Company
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