Glass pipe joint

Claim 2

In combination, a pipe coupling including two axially aligned pipes of substantially equal diameter, a deformable sealing gasket with a cross section sinusoidal in part positioned between the abutting ends of said pipes and extending in an axial direction around and partially in contact with a portion of the exterior surface of said pipes adjacent the ends thereof, the ends of said sealing gasket spaced radially outward from the exterior surfaces of said pipes when said coupling is in the assembled but untightened condition, an elastomeric sleeve containing a bore therethrough with radially inwardly protruding sealing rings over a portion thereof placed exteriorly around said sealing gasket and in contact with substantially the entire external surface of said sealing gasket, said elastomeric sleeve continuing axially beyond the ends of said gasket and containing at least one radially inwardly extending ring on each end thereof that will grasp said pipes when said coupling is in the tightened condition, an external clamp ring positioned exteriorly of said elastomeric sleeve and having an axial extent at least as far as said sleeve, said clamp ring equipped with constricting means and containing a radially inwardly extending edge portion that restricts axial growth of said sleeve when said clamp ring is tightened.

Claim 3

The combination of a pipe coupling as claimed in claim 1 wherein said elastomeric sleeve contains a plurality of axially spaced circumferentially extending excisions in the surface of said bore, said excisions placed between the ends of said sleeve and the axially terminal poinT of said gasket.

Claim 4

The combination of a pipe coupling as claimed in claim 1 wherein said elastomeric sleeve is in contact with and is of sinusoidal cross-sectional configuration contiguous to the sinusoidal cross section of said sealing gasket.

Claim 5

The combination of a pipe coupling as claimed in claim 1 wherein the inwardly protruding rings of the elastomeric sleeve adjacent the exterior portion of said gasket have a radially inward extent greater than the radial extent of the sinusoidal portion of said gasket when in the untightened condition thus providing for a concentration of force in concentric rings around the pipe when the coupling is in the tightened condition.

Claim 6

The combination of a pipe coupling as claimed in claim 1 wherein said pipes each have plain pipe ends and wherein the end portions of said sealing gasket are sinusoidal in cross section and wherein said gasket is symmetrically positioned with respect to the ends of said plain pipe ends.

Claim 7

The combination of a pipe coupling as claimed in claim 5 wherein the elastomeric sleeve is of symmetrical cross section and extends an equal amount in an axial direction over the sealing gasket and the ends of said pipe.

Claim 8

The combination of a pipe coupling as claimed in claim 5 wherein the portion of the sealing gasket that extends between the abutting ends of said pipes has a radially inward extent less than the wall thickness of said pipes.

Claim 9

The combination of a pipe coupling as claimed in claim 1 wherein the end of one pipe is plain and the end of the other pipe is flanged and wherein said sealing gasket extends frustoconical in an axial direction over the exterior of said flanged pipe when said coupling is in the untightened condition.

Claim 10

The combination of a pipe coupling as claimed in claim 8 wherein the elastomeric sleeve contains a single radially inwardly extending ring positioned axially behind the flange on said other pipe.

Claim 11

The combination of a pipe coupling as claimed in claim 9 wherein the single ring abuts the interior of said radially inwardly extending edge portion of said clamp ring.

Claim 12

A coupling device for detachably coupling a pipe in intersealed end-to-end assembled relationship with the end of another pipe, said coupling device comprising an elastomeric tubular sealing gasket having an interior wall surface defining an opening extending axially therethrough and providing axially opposite open ends in which respectively to axially receive one each of said pipe ends, said sealing gasket including a pair of axially interspaced sealing rings projecting circumferentially inwardly from said interior wall surface and closely surrounding said pipes and also including an annular pipe-end interspacer axially intermediate said sealing rings and projecting radially into and circumferentially narrowing a medial region of said opening to provide an abutment for abutting against and interspacing said pipe ends, an elastomeric sleeve exteriorly surrounding said sealing gasket and having interior surface confines contacting the peripheral surface of said sealing gasket and continuing axially beyond at least one axial end thereof to define a plurality of annular axially interspaced rings having continuous frictional pipe gripping surfaces, a clamp ring peripherally surrounding said elastomeric sleeve and having means for constricting and radially biasing said elastomeric sleeve against said sealing gasket and in turn biasing said sealing rings on the latter into continuous circumferential sealing contact with each of said pipe ends, said frictional pipe gripping surfaces in response to constriction of said clamp ring being pressed radially inward and providing frictional gripping contact with the peripheral surface of the pipe axially accommodated within said interspaced rings, said frictional gripping surfaces being arranged to increase in frictional gripping intensity in response to frictional movements of the pipe surface thereagainst.

Claim 13

A coupling device for detachably coupling a pipe in intersealed end-to-end assembled relationship with the end of another pipe, said coupling device comprising an elastomeric tubular sealing gasket having an interior wall surface defining an opening extending axially therethrough and providing axially opposite open ends in which respectively to axially receive one each of said pipe ends, said sealing gasket including a pair of axially interspaced sealing rings projecting circumferentially inwardly from said interior wall surface and closely surrounding said pipes and also including an annular pipe-end interspacer axially intermediate said sealing rings and projecting radially into and circumferentially narrowing a medial region of said opening to provide an abutment for abutting against and interspacing said pipe ends, an elastomeric sleeve exteriorly surrounding said sealing gasket and having interior surface confines contacting the peripheral surface of said sealing gasket and continuing axially beyond at least one axial end thereof to define a plurality of annular axially interspaced rings having continuous frictional pipe gripping surfaces, a clamp ring peripherally surrounding said elastomeric sleeve and having means for constricting and radially biasing said elastomeric sleeve against said sealing gasket and in turn biasing said sealing rings on the latter into continuous circumferential sealing contact with each of said pipe ends, said frictional pipe gripping surfaces in response to constriction of said clamp ring being pressed radially inward and providing frictional gripping contact with the peripheral surface of the pipe axially accommodated within said interspaced rings, said frictional gripping surfaces being arranged to increase in frictional gripping intensity in response to frictional movements of the pipe surface thereagainst.