Pipe joints or couplings – With fluid pressure seal – Swivel with flange in socket
Patent
1980-04-14
1982-04-27
Callaghan, Thomas F.
Pipe joints or couplings
With fluid pressure seal
Swivel with flange in socket
277 24, 285281, F16L 2700
Patent
active
043267360
ABSTRACT:
A swivel joint to be located at the upper end of a drill string in reverse circulation drills to support loads occurring on the drill string, the swivel joint including a fixed outer housing, a center housing rotatably mounted in the outer housing through bearings, a hollow inner housing vertically slidably fitted in the center housing, and an upper lid fixedly mounted on the outer housing to close the inner and center housings, the inner housing having at the upper and lower ends thereof flanged projections extending toward the center housing to restrict the range of the vertical sliding movement of the inner housing and being, after imposition and release of a downward thrust, slid upward within a range defined by a spacing between the flanged projection at the lower end of the inner housing and the lower end of the center housing subject to an upward thrust acting thereon, thereby preventing transmission of the upward thrust to the outer housing.
REFERENCES:
patent: 2501680 (1950-03-01), King
patent: 2507849 (1950-05-01), Bland
patent: 3460858 (1969-08-01), Lentzen et al.
patent: 3497244 (1970-02-01), Grantom
patent: 4223923 (1980-09-01), Hill
Kusumi Hiroshi
Wada Masami
Callaghan Thomas F.
Hitachi Construction Machinery Co. Ltd.
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