Pipe joints or couplings – With means blocking release of holding means – Set screw
Patent
1976-07-28
1978-01-17
Callaghan, Thomas F.
Pipe joints or couplings
With means blocking release of holding means
Set screw
285115, 285309, 285356, F16L 2100
Patent
active
040688658
ABSTRACT:
Pipe connectors particularly useful in securing sections of an underwater marine riser together, including a pin received in a box and bearing against a box shoulder, the pin and box being secured together by coengaging members mounted on the box, and between the pin and box, and forced against a shoulder at the outer portion of the pin over substantially 360.degree. of the shoulder, to correspondingly force the outer end of the pin against the box shoulder, with the contacting pin and box surfaces axially preloaded against each other. The coengaging members can include a plurality of lock dogs mounted in the box and movable radially inwardly against a ring device disposed between the box and pin and engaging the shoulder at the outer portion of the pin, the dogs and pin device having coengaging cam surfaces causing dogs to exert an axial thrust on the ring device which is transmitted from the ring device to the pin shoulder. Bending forces imposed on the connector are transmitted between the box and pin without subjecting the lock dogs to such forces. In another embodiment of the invention, the coengaging members include a ring threaded on the box member and engaging a spacer ring which in turn engages a segmental ring contacting the pin shoulder, rotation of the threaded ring shifting the spacer and segmented rings axially to pre-load the pin and against the box shoulder.
REFERENCES:
patent: 1973809 (1934-09-01), Heggem
patent: 2472425 (1949-06-01), Howard
patent: 2523874 (1950-09-01), Moore
patent: 3494638 (1970-02-01), Todd et al.
patent: 3606393 (1971-09-01), Huntsinger et al.
patent: 3827728 (1974-08-01), Hynes
Callaghan Thomas F.
Vetco Offshore Inc.
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