Pipe joints or couplings – End to side or plate – Screw
Patent
1995-10-13
1998-02-03
Melius, Terry Lee
Pipe joints or couplings
End to side or plate
Screw
220 22, 174 65R, 174 11BH, 174 1705, F16L 512
Patent
active
057136106
ABSTRACT:
A vacuum system (20) includes an enclosure (22) having a vacuum-tight wall (26) and an internally threaded aperture (66) through the wall (26). A tip-off fitting (24) has a base (50) with a bore (52) therethrough, a hollow tube (62) fixed to the base (50) with a vacuum-tight seal, such that an interior (64) of the tube (62) is in communication with the bore (52) in the base (50), and an external thread (58) on the exterior of the base (50). The external thread (58) on the exterior of the base (50) is dimensioned to threadably engage the internal thread (68) on the aperture (66). There is a disengageable vacuum sealant (70) such as a layer of indium metal between the external thread (58) of the base (50) and the internal thread (68) of the aperture (66). The vacuum system (20) is evacuated through the tip-off fitting (24) and sealed by closing off the hollow tube (62). At a later time, the vacuum system can be brought to atmospheric pressure and then reseated by replacing the tip-off fitting with another tip-off fitting and repeating the evacuation and sealing.
REFERENCES:
patent: 3771278 (1973-11-01), Gray et al.
patent: 4140337 (1979-02-01), Arcella et al.
patent: 4468309 (1984-08-01), White
patent: 4570983 (1986-02-01), Olenfalk et al.
patent: 5359148 (1994-10-01), Okase et al.
patent: 5433639 (1995-07-01), Zahuta et al.
patent: 5598966 (1997-02-01), Romano et al.
Eneim Arthur A.
Evans Tom K.
Hughes Gary B.
Romano Timothy S.
Denson-Low W. K.
Melius Terry Lee
Santa Barbara Research Center
Schubert W. C.
Shackelford Heather
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