Pipe joints or couplings – With fluid pressure seal – With separate – encased pipe-gripping means
Patent
1991-10-10
1993-03-30
Nicholson, Eric K.
Pipe joints or couplings
With fluid pressure seal
With separate, encased pipe-gripping means
285321, 285231, 285232, 285374, F16L 2102
Patent
active
051977680
ABSTRACT:
A pipe joint and a locking member for use with the pipe joint are provided for a bell and spigot type joint, the locking member being a separate element disposed axially outwardly of a fluid seal gasket within the bell end of a first of the pipe elements, the locking member being made up of an elastomeric backing member and at least one locking segment, the elastomeric backing member being adapted to seat in a first annular recess in the bell end, and against a radially inwardly protruding shoulder, this seating position urging the outer surface of the locking segment into contact with the wall of the first annular recess, to effect a constant, positive wedging action against a spigot end of a second pipe element inserted into the bell end of the first pipe element. The locking member thus securely engages and retains the spigot end within the bell end against axial forces tending to separate the pipe elements, and the locking member serves as a dirt seal improving the prevention of dirt and other materials from entering the bell end of the joint which could adversely affect the integrity of the fluid seal or interfere with the ability to efficiently induce any desired joint deflection.
REFERENCES:
patent: 3843167 (1974-10-01), Gronstedt
patent: 3884510 (1975-05-01), Bram
patent: 4303262 (1981-12-01), Pierrel et al.
patent: 4662656 (1987-05-01), Douglas et al.
patent: 5037144 (1991-08-01), Peting et al.
American Cast Iron Pipe Company
Nicholson Eric K.
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