Brazing joint for tubes and the like

Details Brazing joint for tubes and the like Brazing joint for tubes and the like

2001-10-24

2003-10-14

Hook, James (Department: 3752)

Pipes and tubular conduits

Combined

With end structure

C138S155000, C138S177000, C285S288600, C285S332400, C285S399000

Reexamination Certificate

active

06631740

ABSTRACT:

FIELD OF THE INVENTION
The present invention is directed to brazed joints and the like wherein two members are coupled to one another with the coupling being secured by a brazing material such as copper. More particularly, the present invention is directed to, but not limited, to joining tubular members to one another or to other members such as fittings.
BACKGROUND OF THE INVENTION
There is a constant need to provide reliable couplings for devices such as metal tubes, wherein the couplings are relatively inexpensive and can withstand mechanical stress due to vibration, heat, impact, compression and tension. In addition, it is necessary that the couplings withstand chemical corrosion. Many high pressure joints require lengths of tubing which are made of steel and do not have a requirement that tubing be separated during operational life. It has become customary to utilize copper brazing to bond such materials, however the lengths of joints necessary for high pressure couplings have increased to the extent that copper flow in the joints is occasionally impeded. Consequently, tubes which have been joined with copper brazing not infrequently require reprocessing. This concern has raised questions of product integrity, making it difficult to determine if tube couplings are sound without destructive testing. Accordingly, there is a need for reliable couplings which are relatively easy to assemble and are forgiving with respect to deviations in shape and surface quality, so that reliability is not compromised by frequently occurring anomalies.
SUMMARY OF THE INVENTION
In view of the above and other concerns, the present invention is directed to a joint between first and second metal members wherein the first metal member includes a socket which receives the second metal member. An inwardly tapered wall defines a frustoconical space in the socket of the first member, while an annular base within the socket defines the end of the socket and supports brazing material. At least one of the members has a knurled portion which frictionally retains the end of the first metal member within the socket and to provide paths for the brazing material as the joint is heated to liquefy the brazing material so as to allow the brazing material to flow along the grooves. When the brazing material solidifies, the first and second metal members are permanently coupled to one another.
In further aspects of the invention, the first and second metal members are steel tubes and the brazing material is configured as a copper ring.


REFERENCES:
patent: 2017154 (1935-10-01), Larkin
patent: 3500538 (1970-03-01), Raciti
patent: 3823464 (1974-07-01), Chartet
patent: 4576325 (1986-03-01), Maurice
patent: 4915426 (1990-04-01), Skipper
patent: 5082070 (1992-01-01), Obermeier et al.
patent: 5160090 (1992-11-01), Friedrich et al.
patent: 5338072 (1994-08-01), Bitter et al.
patent: 5511831 (1996-04-01), Barton

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