S & B Technical Products, Inc.

Northwest Pipe Company

Sewer Sentry LLC

S & B Technical Services, Inc.

Guido Quesada

Bradford G Corbett, Jr

Mark A Weih

Rodney Pacheco

Bernal Rojas

Gerardo Darce

David A Putnam

Brent Keil

Keith Steinbruck

Bruce VanderPloeg

William Eugene Putnam

Randall Avery Putnam

Mark Alfred Weih

A pipe belling process where a heated thermoplastic pipe end is forced over a sealing gasket on a forming mandrel, with the pipe being subsequently cooled to retain the gasket in an internal groove simultaneously formed in the pipe end. The sealing gasket is a two-component gasket with an elastic component and a plastic component. The elastic component is stretched over a portion of the plastic component during assembly with the plastic component acting as a belling ramp for the gasket during the subsequent pipe belling operation.

Rieber sealing system with plastic retainer ring

A sealing gasket is shown which is designed to be used in making up a sealed pipe joint in a plastic pipeline conveying fluids, such as a water or sewer pipeline. The sealing gasket is a two-component gasket with an elastomeric component and a plastic component. The elastomeric component is stretched over a portion of the plastic component during assembly. Since the two components of the gasket are not permanently bonded to one another, the gasket can be disassembled, allowing various combination s of seal and retainer designs. The gasket can be removed and replace by another gasket after the initial installation. The hard plastic component can be provided with a gripping structure which acts as a restraint mechanism when the sealing gasket is in use.

Sealing gasket with plastic retainer ring for plastic pipeline systems having pre-formed sockets

A reinforced gasket for sealing a manhole, the gasket comprising a reinforcement ring having an upper surface and a generally planar lower surface; and a sealing assembly comprising a first ring and a second ring with an intermediate member extending between the first ring and the second ring, the intermediate member defining a contact surface; wherein the reinforcement ring is disposed between the first ring and the second ring of the sealing assembly such that the upper surface of the reinforcement ring is in contact with the contact surface of the seal ring.

Reinforced manhole cover gasket

A mechanism for restraining pipe against both internal and external forces at a pipe or fitting connection and to join and seal at least two pipes to form a pipeline featuring an improved restraint mechanism. The restraint mechanism includes a circumferential casing and a companion grip ring, both of which are received within a mating groove provided in the belled end of a female pipe. The grip ring is made up of a series of arc-shaped gripping elements which are interconnected by discrete elastomeric segments. The gripping elements are separated by gaps so that a flexible hinge region is created by the elastomeric segments between adjacent gripping elements. The elastomeric segments provide both axial and radial spring action to the assembly.

Segmented grip ring for plastic pipe joint restraint systems

A sealing gasket is shown which is used to seal the belled end opening of a female ductile iron pipe to a mating male pipe having an interior surface and an exterior surface. The sealing gasket has an annular gasket body made of a resilient elastomeric material which is bonded to a hard plastic reinforcing band. The annular gasket body is installed within a raceway provided in the mouth region of the female ductile iron pipe so that an outer circumferential region forms a seal with the female pipe mouth region and an inner circumferential region forms a sealing surface for the exterior surface of the mating male pipe. The reinforcing band has a circumferential body which is made of a synthetic polymer which has a greater hardness than the elastomeric material of the remainder of the gasket body.

Sealing gasket for ductile iron pipe and method of manufacture

A pipe joining system and pipe joint are shown m which two sections of molecularly oriented pipe are joined using heat shrinking techniques. A first section of pipe is provided having a straight, pre-formed socket with an internal diameter and with an end opening having enough clearance to allow a mating spigot section having a given external diameter to be inserted into the socket end opening. After the spigot end is inserted to a given depth, the socket is heated sufficiently so that the internal diameter of the socket end comes into contact with the external diameter of the spigot end, the molecularly oriented pipe being in a rubbery state and exhibiting a low elastic modulus which allows the socket end to conform tightly to the spigot end external diameter without deforming the spigot end.

Apparatus and method for joining molecularly oriented pipe

A pipe joining system and pipe joint are shown in which two sections of plastic pipe, particularly molecularly oriented pipe, are joined. A ring-shaped elastomeric body is installed within a mating groove provided in a mouth region of female pipe section. The ring-shaped body is formed of an injection molded elastomeric material which is joined to a series of arcuate gripping segments which have teeth on an inner surface thereof which are designed to engage an outer surface of a mating male pipe section to restrain movement of the male pipe after assembly of a pipe joint. The gripping segments are separated by a gap which is open prior to assembly, but which closes during assembly. Each of the segments also has a positive stop feature to prevent over travel of the male pipe section relative to the female pipe section.

Sealing and restraining gasket for use in plastic pipelines

A seating and restraint system is shown for joining the spigot and socket ends of two sections of plastic pipe to form a pipe joint. The socket pipe ends are preformed at the factory with an internal raceway which receives both a sealing ring and a companion gripping ring. The sealing ring is an elastomeric member having a periphery with a protruding ear formed at one circumferential location. The companion gripping ring is a hardened member having one opening gap in the circumference thereof. The protruding ear on the sealing ring fits within the opening gap in the gripping ring, engagement of the protruding ear within the opening gap serving to prevent extrusion of the sealing ring within the gap in the gripping ring and also limiting closure of the gripping ring after engagement of the spigot end with the socket pipe end as the pipe joint is assembled.

Sealing and restraint system for joining plastic pipe sections having pre-formed sockets

A pipe sealing gasket is shown which is designed to be received within a raceway provided within the female, belled end of a section of plastic pipe which is assembled with a mating male pipe end to form a plastic pipe joint. The gasket is made up of a hard plastic band having an outer circumferential surface and an inner circumferential surface, and two separated elastomer portions. A first of the separated elastomer portions forms an outer ring which circumscribes the outer circumferential surface of the hard plastic band. The second of the separated elastomer portions forms an inner lip which circumscribes the inner circumferential surface of the hard plastic band. The two separate elastomer portions are connected during the gasket molding operation by a series of spaced ribs which form a continuous body of elastomer connecting the first and second separated elastomer portions at spaced intervals.

Lightweight sealing gasket for low pressure and non-pressure applications

Pipe sealing gasket

A method and sealing gasket are shown for providing a sealing joint between a spigot section and a socket section of low pressure plastic pipe, such as drain waste vent pipe that require a minimum of tools and operational steps to complete. The sealing gasket is installed in one of the sections to be joined and the spigot section is inserted within a mouth opening of the socket section with the sections being pressed together in a single operation, thereby forming both the joint and the seal. The sealing gasket is a composite gasket made with one section of a hard plastic material and one section of a thermoplastic elastomer material. No glue or adhesive is required.

Sealing joint for low pressure pipe systems and method of manufacture

A pipe sealing gasket is shown which is designed to be received within a raceway provided within a socket end of a female bell plastic pipe end which is assembled with a mating male pipe end to form a plastic pipe joint. The raceway in the female bell plastic pipe end is preformed during manufacture and the gasket is installed thereafter. The gasket has a rubber body portion which is reinforced by a hard plastic band formed as a series of integral, spaced wedges which are interconnected by a flexible ribbon. The gasket is flexible enough to be flexed and placed in the pipe raceway and yet the hard plastic band acts to prevent extrusion of the gasket during a variety of pressure conditions as well as preventing displacement during field assembly.

Sealing gasket with specialized reinforcing ring for sealing plastic pipelines

A pipe sealing gasket is shown which is designed to be received within a raceway provided within a socket end of a female bell plastic pipe end which is assembled with a mating male spigot pipe end to form a plastic pipe joint. The raceway in the female bell plastic pipe end is preformed during manufacture and the gasket is installed thereafter. The gasket has a rubber body portion which is reinforced by a hard corrugated ring-shaped insert. The hard corrugated ring-shaped insert acts to prevent extrusion of the gasket during a variety of pressure conditions as well as preventing displacement during field assembly.

Sealing gasket with corrugated insert for sealing restrained or non-restrained plastic pipelines

A pipe gasket is positioned within a pocket in a socket portion of a first end of a first pipe and the end of a spigot pipe is inserted into the socket with the gasket sealing the gap between the pipes. The gasket in one form comprises a blunt rounded nose portion, a central body portion with an insert embedded therein and a rear sealing portion comprising first and second projections, such as fins, that diverge and respectively engage the first pipe and the second pipe.

Pipe seal and pipe joint

A pipe joining system and pipe joint are shown in which two sections of plastic pipe, particularly molecularly oriented pipe, are joined. A first section of plastic pipe has a female, belled pipe end with a mouth opening and having an exterior surface, an interior surface and having an interior circumferential recess formed in the belled pipe end adjacent the mouth opening on the interior surface thereof. A second section of plastic pipe having a mating male plastic pipe end has an interior surface and exterior surface. The exterior surface has a circumferential groove formed at one circumferential location thereof which is alignable with the interior recess formed within the mouth opening of the belled pipe end as the pipe joint is made-up. The circumferential groove is formed during the manufacture of the plastic pipe by expanding the pipe against a restraining element located in the interior of an expansion mold. The respective grooves contain elements of a restraint system which form a restrained joint when the male and female pipe sections are assembled.

Growing community of inventors

San Jose, Costa Rica

Guido Quesada