US 3,998,478 A · Joint construction with sealing gasket for joints with plastic or other pipes

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.

Claims15

Dependent claims

For use with plastic or other pipes of a size of about 11/2 inches and larger, a joint construction wherein:

one piping element has a smooth plain spigot or cylindrical male end;
a second piping element has a female end receiving said male end,
said female end having an inner length portion with an inside diameter tapering inwardly from a size slightly larger than the outside diameter of said male end so that it as a substantially cylindrical socket circumferentially snugly receives the male end for coaxial alignment;
said female end having an outer length portion interiorly cylindrical as a bell with an inside diameter defining an annular space with and around the male end;
and
improved sealing means comprising a pliable annular thin ribbon-bodied gasket received within the outer length portion in said annular space,
in axial length about equal to that of the said outer length portion, but affording an endwise clearance of the gasket inner end from the bottom of said annular space as emplaced therein, before insertion of a spigot;
said gasket being of smooth surfaced polyvinyl chloride or the like elastomer,
said gasket having a plurality of at least three integral pliable internal annular gripping fins axially spaced on the inner circumference of its body,
the said fins being defined respectively each by a female conical outer surface decreasing in diameter axially inwardly and an inner surface running from the said outer conical surface outwardly to the body, and
all fins outward of the innermost fin being each undercut to have the inner surface thereof make an acute angle with the body and said body having, as emplaced, a cylindrical external circumference conformed to the cylindrical interior circumference of the said outer length portion, to sealingly engage and hold the male end and hold the gasket firmly in said space and seal such space;
said gasket being provided on the external circumference of its outer end with an integral circumferential flange engaging the outer end edge of said bell to anchor the gasket outer end during insertion of a spigot end through the emplaced gasket into said female end.

9 more elements

For use with plastic or other smooth surfaced piping elements, such as plastic pipe, pipe fittings and liquid handling devices connected thereto, in low pressure or gravity flow service, and electrical and telephone conduiting,

a sealed joint construction comprising:
an externally smooth, non-grooved, non-ribbed spigot male joined element end;
an internally smooth non-grooved, non-ribbed, bell-like female joined element end;
said ends telescoped in bell-and-spigot fashion to define an annular recess of narrow gap or width and of considerable axial depth as compared with the gap, and with the female element, inward of said recess, contracting in inside diameter from an outer bell portion to an inner female portion having an inside diameter providing a substantially cylindrical socket receiving and embracing an inmost inserted spigot end portion;
and
inserted in te recess, a limp, pliable annularly unitary, thin gasket made of smooth-surface elastomer such as polyvinyl chloride or the like;
said 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 endwise;
the gasket having as an outer end mouth, an internal, spigot lead-in bevel, and one said rib occurring at the gasket inner end;
the axial length of the gasket portion insertable in said recess being, in the gasket free state, shorter than the recess depth,
the radial thickness of the ribs plus body being greater than the recess gap;
said ribs being of shape and thickness to be, when the gasket is located in the bell, compressed and deflected by the entering spigot end, and enabling the spigot end, in encountering resistance of the successive ribs, axially to stretch and thereby radially thin the gasket, as permitted by the smooth cylindrical forms of the gasket exterior and bell interior and the recess depth exceeding the gasket inserted length,
whereby seal is achieved upon spigot insertion past the inner rib and ensuing relief of gasket stretch.

11 more elements

Dependencies are inferred from the claim text.

Joint construction with sealing gasket for joints with plastic or other pipes

Life of this patent

Joint construction with sealing gasket for joints with plastic or other pipes

Life of this patent

Abstract

Claims15