Separation-preventive pipe joint

Details Separation-preventive pipe joint Separation-preventive pipe joint

1977-09-01

1978-09-26

Callaghan, Thomas F.

Pipe joints or couplings

Variable length

Telescopic with relative motion

285321, 285374, F16L 2104

Patent

active

041164784

ABSTRACT:
A spigot is inserted into a socket, with a seal packing pressed from the opening side of the socket into an annular space defined between the socket and the spigot, a lock ring fitted in an annular groove formed in the inner peripheral surface of the pocket inwardly of the seal packing, and an engaging projection provided on the outer periphery of the front end of the spigot for axial engagement with the lock ring. The lock ring is a split lock ring which can be inserted from the annular space between the socket and the spigot toward the innermost part of the socket and has a diametrically expanding force. The depth of the annular groove is controlled so as to allow the radially inner region of the lock ring fitted in the groove to engage the engaging projection. A back-up ring is disposed between the seal packing and the split lock ring and the mutual abutting surfaces of the split lock ring and back-up ring are conical surfaces tapering toward the front end of the spigot.

REFERENCES:
patent: 1204728 (1916-11-01), Arena
patent: 1363974 (1920-12-01), Heylman
patent: 3135363 (1964-06-01), Bourassa
patent: 3405957 (1968-10-01), Chakroff
patent: 3434745 (1969-03-01), Jackman
patent: 3712648 (1973-01-01), Clifford
patent: 3783178 (1974-01-01), Philibert et al.
patent: 3941410 (1976-03-01), Miyaoka

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