Pipe joints or couplings – With fluid pressure seal – Flexible lip
Patent
1974-08-30
1976-12-21
Callaghan, Thomas F.
Pipe joints or couplings
With fluid pressure seal
Flexible lip
277207A, 285345, 285369, F16L 1702
Patent
active
039984788
ABSTRACT:
A sealing joint construction with gasket for joints especially in or with plastic pipes, such as electrical or telephone conduit pipes, drainage or sewer conduit pipes, either bell-and-plain-spigot type pipe or plain end pipe connected by a coupling fitting or pipe and other drainage fittings, characterized by use of a smooth non-grooved, non-ribbed spigot male and bell-like female joined element ends telescoped in bell-and-spigot fashion, the female end being double-belled to receive snugly the innermost spigot end and outwardly thereof to define an annular recess of narrow gap or width and of considerable axial depth, and, inserted in the recess, a limp, pliable, endless, i.e. closed or annular, unitary, thin ribbon form gasket made of smooth surfaced polyvinyl chloride or the like; the gasket comprising a thin sleeve-like body externally smooth and having a set of axially spaced, integral pliable internal annularly continuous sealing and gripping fins or ribs, and on the outer gasket end, a circumferentially continuous external radial flange to engage the bell end; the gasket having a spigot lead-in internal bevel at its outer end or mouth, and one heavy rib occurring at the gasket inner end; in the gasket free state, the radial thickness of the ribs plus body being greater than the recess gap; those other than the inner end rib preferably being of shape and thickness to be more readily compressed and deflected, when located in the bell, by the entering spigot end than the inner end rib; with the smooth cylindrical gasket exterior and bell interior enabling the spigot end, in encountering the successive ribs, axially to stretch, and thereby radially thin, the gasket, and for the added ease of insertion upon encountering the innermost rib finally before complete spigot insertion, axially to stretch the gasket over its length, as permitted by the recess depth exceeding the gasket inserted length, whereby seal is achieved upon spigot insertion past the inner rib and relief of gasket stretch.
REFERENCES:
patent: 217249 (1879-07-01), Tasker
patent: 1817774 (1931-08-01), Sipi
patent: 2245154 (1941-06-01), McWane
patent: 2980449 (1961-04-01), Dunton
patent: 3081102 (1963-03-01), Murray et al.
patent: 3198560 (1965-08-01), Collins
patent: 3400954 (1968-09-01), Brown
patent: 3414273 (1968-12-01), Sumner
patent: 3573871 (1971-04-01), Warner
Callaghan Thomas F.
Golrick P. D.
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