US3915480A — Pullout resistant pipe coupling member and gasket…

Claim 1

Independent Claim 265 words

In a pipe coupling for non-metallic plastic pipe including a radially deformable elongated shell in which to receive a pipe section of non-metallic plastic composition to be coupled, and at least one annular gasket recess defined interior in a deformable section of said shell with at least a portion of said recess forming an inclined plane of reducing dimension extending toward the open end thereof, a gasket contained in said recess and comprising: a. a substantially annular first portion of elastomeric composition having a peripheral shape generally conforming to the wall configuration of said recess; b. a substantially annular second portion of elastomeric composition having a peripheral shape generally conforming to the wall configuration of said recess; and c. a ring-like inelastic third portion of predetermined circumferential extent less than annular having a pipe gripping surface defined on its radially inner face and positioned contiguously juxtaposed in a sandwich relation between said first and second portions said third portion having a radial thickness at least at its radial faces greater than the radial thickness of the contiguous faces of the respective first and second gasket portions thereat and being responsive to deformation of said coupling shell to constrict radially inward into a penetrating gripping engagement with a non-metallic plastic pipe section received thereat while operative in response to a drawbar pull incurred by a gripped pipe section therein acting to urge said third portion past said inclined plane to limit constriction of said third portion for preventing movement of said third portion past said inclined plane and thereby prevent pullout of the gripped pipe section.

Claim 2

Dependent Claim 265 words

In a pipe coupling for non-metallic plastic pipe including a radially deformable elongated shell in which to receive a pipe section of non-metallic plastic composition to be coupled, and at least one annular gasket recess defined interior in a deformable section of said shell with at least a portion of said recess forming an inclined plane of reducing dimension extending toward the open end thereof, a gasket contained in said recess and comprising: a. a substantially annular first portion of elastomeric composition having a peripheral shape generally conforming to the wall configuration of said recess; b. a substantially annular second portion of elastomeric composition having a peripheral shape generally conforming to the wall configuration of said recess; and c. a ring-like inelastic third portion of predetermined circumferential extent less than annular having a pipe gripping surface defined on its radially inner face and positioned contiguously juxtaposed in a sandwich relation between said first and second portions said third portion having a radial thickness at least at its radial faces greater than the radial thickness of the contiguous faces of the respective first and second gasket portions thereat and being responsive to deformation of said coupling shell to constrict radially inward into a penetrating gripping engagement with a non-metallic plastic pipe section received thereat while operative in response to a drawbar pull incurred by a gripped pipe section therein acting to urge said third portion past said inclined plane to limit constriction of said third portion for preventing movement of said third portion past said inclined plane and thereby prevent pullout of the gripped pipe section.

Claim 3

Dependent Claim 22 words

a substantially annular second portion of elastomeric composition having a peripheral shape generally conforming to the wall configuration of said recess; and

Claim 4

Dependent Claim 22 words

a substantially annular second portion of elastomeric composition having a peripheral shape generally conforming to the wall configuration of said recess; and

Claim 5

Dependent Claim 35 words

In a pipe coupling according to claim 1 in which said third portion is subject to a limit of radially inward constriction by an abuttment of its opposed ends initially defining said predetermined circumferential extent.

Claim 6

Dependent Claim 67 words

a plurality of individual gripping members centrally embedded within said elastomer and located angularly displaced in a circumferential direction thereabout, each of said gripping members extending in a direction generally normal to the ring axis and having serrations on its periphery extending in a longitudinal direction and responsive to deformation of said coupling to effect a biting grip between the opposing walls of pipe and coupling thereat.

Claim 7

Dependent Claim 67 words

a plurality of individual gripping members centrally embedded within said elastomer and located angularly displaced in a circumferential direction thereabout, each of said gripping members extending in a direction generally normal to the ring axis and having serrations on its periphery extending in a longitudinal direction and responsive to deformation of said coupling to effect a biting grip between the opposing walls of pipe and coupling thereat.

Claim 8

Dependent Claim 52 words

IN a pipe coupling according to claim 2 in which said third portion is of metal composition and there is included a metal sleeve adapted to be positioned in a received pipe end in radial alignment with said gasket to reinforce the pipe against the deformation forces applied against said coupling shell.

Claim 9

Dependent Claim 166 words

a ring-like inelastic third portion of predetermined circumferential extent less than annular having a pipe gripping surface defined on its radially inner face and positioned contiguously juxtaposed in a sandwich relation between said first and second portions said third portion having a radial thickness at least at its radial faces greater than the radial thickness of the contiguous faces of the respective first and second gasket portions thereat and being responsive to deformation of said coupling shell to constrict radially inward into a penetrating gripping engagement with a nonmetallic plastic pipe section received thereat while operative in response to a drawbar pull incurred by a gripped pipe section therein acting to urge said third portion past said inclined plane to limit constriction of said third portion for preventing movement of said third portion past said inclined plane and thereby prevent pullout of the gripped pipe section; and b. a second gasket contained in the other of said recesses adapted for use with metal pipe and comprising:

Claim 10

Dependent Claim 166 words

a ring-like inelastic third portion of predetermined circumferential extent less than annular having a pipe gripping surface defined on its radially inner face and positioned contiguously juxtaposed in a sandwich relation between said first and second portions said third portion having a radial thickness at least at its radial faces greater than the radial thickness of the contiguous faces of the respective first and second gasket portions thereat and being responsive to deformation of said coupling shell to constrict radially inward into a penetrating gripping engagement with a nonmetallic plastic pipe section received thereat while operative in response to a drawbar pull incurred by a gripped pipe section therein acting to urge said third portion past said inclined plane to limit constriction of said third portion for preventing movement of said third portion past said inclined plane and thereby prevent pullout of the gripped pipe section; and b. a second gasket contained in the other of said recesses adapted for use with metal pipe and comprising:

Claim 11

Dependent Claim 27 words

In a pipe coupling according to claim 3 in which each of said first and second portions are loosely assembled and readily separable from said third portion.

Claim 12

Dependent Claim 31 words

In a pipe coupling according to claim 3 in which the gripping surface of said third gasket portion comprises axially alternating hills and valleys adapted to engage a pipe surface thereat.

Claim 13

Dependent Claim 90 words

In a transition pipe coupling for connecting non-metallic plastic pipe to metal pipe including a radially deformable elongated shell in which to receive a pipe section to be coupled, and an annular gasket recess defined interior at each opposite shell end in a deformable section of said shell with at least a portion of one said recess forming an inclined plane of reducing dimension extending toward the open end thereof, a. a first gasket contained in the one of said recesses and adapted for use with non-metallic plastic pipe comprising:

Claim 14

Dependent Claim 90 words

In a transition pipe coupling for connecting non-metallic plastic pipe to metal pipe including a radially deformable elongated shell in which to receive a pipe section to be coupled, and an annular gasket recess defined interior at each opposite shell end in a deformable section of said shell with at least a portion of one said recess forming an inclined plane of reducing dimension extending toward the open end thereof, a. a first gasket contained in the one of said recesses and adapted for use with non-metallic plastic pipe comprising:

Claim 15

Dependent Claim 18 words

In a pipe coupling according to claim 6 in which said gripping members comprise axially linear roller units.

Claim 16

Dependent Claim 25 words

In a pipe coupling according to claim 7 in which said serrations extend generally straight and relatively parallel with the axis of said gripping members.

Claim 17

Dependent Claim 22 words

In a pipe coupling according to claim 7 in which said serrations generally extend helically about the periphery of said gripping members.

Claim 18

Dependent Claim 32 words

In a pipe coupling according to claim 7 in which the roller units are of predetermined axial length adapted to substantially define a chordal relation with the deformed section of said shell.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-10-27	1979-04-28	1979-10-28	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-10-27	1983-04-28	1983-10-28	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-10-27	1987-04-28	1987-10-28	$7700.00	Window Closed / Lapsed

Pullout resistant pipe coupling member and gaskets therefor

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