Joint between tubes of a tube combination having annular...

Details Joint between tubes of a tube combination having annular... Joint between tubes of a tube combination having annular...

2005-01-11

2005-01-11

Cottingham, John R. (Department: 3679)

Joints and connections

Member ends joined by inserted section

C403S294000, C403S296000, C403S300000, C403S305000

Reexamination Certificate

active

06840702

ABSTRACT:
A tube combination has upper and lower tubes, which are joined together with a coupling, and which have spaced annular trenches on outer sides. Annular projections are formed on the upper end of the lower tube and the lower end of the upper tube; the annular projections are pressed against each other when the tubes are joined together, and are shaped such that they together are in the shape of the annular trenches when the tubes are joined together, making the tube combination look like one having a single tube part.

REFERENCES:
patent: 4068346 (1978-01-01), Binder
patent: 5022777 (1991-06-01), Kolvites
patent: 5704728 (1998-01-01), Chan
patent: 6073642 (2000-06-01), Huang

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