Method of attaching tubing to a metal fitting
A fluid connection for connecting a tubing, such as a gas tubing for a hot water tank burner, to a metal fitting includes a deformed outer portion of the fitting. In particular, a recess is defined between radially inner and outer portions of the fitting, and the tubing is inserted into that recess. The inner portion of the fitting extends into an inner bore of the tubing to provide support at the inner bore. The outer portion of the fitting is then deformed radially inwardly to secure the tube to the fitting.
1 . A fluid connection comprising:
tubing having a forward portion extending forwardly into a recess in a fitting, said recess being defined between a radially inner portion and a radially outer portion of said fitting, with said radially inner portion extending into an inner bore of said tubing to support said tubing; and
said radially outer portion of said fitting being inelastically deformed radially inwardly against said tubing to secure and seal said tubing to said fitting.
2 . The fluid connection as set forth in claim 1 , wherein an outer surface of said radially inner portion has a raised portion against which said tubing is deformed to secure said tubing and provide said seal.
3 . The fluid connection as set forth in claim 2 , wherein said raised portion is formed on a cylindrical outer surface of said radially inner portion.
4 . The fluid connection as set forth in claim 2 , wherein said raised portion is a generally flared end of said recess, and said tubing having a mating flared inner end.
5 . The fluid connection as set forth in claim 1 , wherein said tubing has corrugation at locations removed from said forward portion.
6 . The fluid connection as set forth in claim 1 , wherein a seal is placed between said radially outer portion and said forward portion.
7 . A gas supply connection comprising:
a gas source for supplying gas into a tubing, said tubing being connected to a fitting;
said fitting for communicating gas from said tubing into a hot water tank burner; and
said fitting connected to said tubing with a forward portion of said tubing extending forwardly into a recess in said fitting, said recess being defined between a radially inner portion and a radially outer portion of said fitting, with said radially inner portion extending into an inner bore of said tubing to support said tubing, said radially outer portion of said fitting being inelastically deformed radially inwardly against said tubing to secure and seal said tubing to said fitting
8 . The gas supply connection as set forth in claim 7 , wherein an outer surface of said radially inner portion has a raised portion against which said tubing is deformed to secure said tubing and provide said seal.
9 . The gas supply connection as set forth in claim 8 , wherein said raised portion is formed on a cylindrical outer surface of said radially inner portion.
10 . The gas supply connection as set forth in claim 8 , wherein said raised portion is a generally flared end of said recess, and said fluid tubing having a mating flared inner end.
11 . The gas supply connection as set forth in claim 7 , wherein said tubing has corrugation at locations removed from said forward portion.
12 . The gas supply connection as set forth in claim 7 , wherein a seal is placed between said radially outer portion and said forward portion.
13 . A method of connecting a tubing to a fitting including the steps of:
providing a fitting with a recess defined between a radially inner portion and a radially outer portion;
inserting a forward end of said tubing into said recess, with said radially inner portion being received within an inner bore of said tubing to support said tubing; and
inelastically deforming said radially outer portion radially inwardly against said tubing to secure said tubing to said fitting.
14 . The method as set forth in claim 13 , further including the steps of providing a raised portion on an outer surface of said radially inner portion, and the deformation of said radially outer portion forcing said tubing against said raised portion.