Abstract: A gasket for pipe-to-pipe connections, which is closely received within a rectangular-shaped annular groove in the bell end of a pipe, and provides a compressive, fluid-tight seal with the spigot end of another pipe. The gasket includes a two-part body having a substantially rectangular profile in section, including a relatively rigid component joined to a relatively resilient component. The resilient component includes a radially inwardly projecting sealing lobe for providing a compressive seal with the spigot end of a pipe, and a reinforcement portion of the rigid component is disposed between the sealing lobe and the pipe bell end to provide a radially non-compressible reaction surface against which the sealing lobe is compressed. The rigid component also includes a tapered leading edge portion for aligning and centering the spigot end of a pipe upon insertion within the gasket, and the leading edge portion is reinforced by a plurality of circumferentially spaced ribs.

Abstract: An expansion ring assembly for sealing a gasket with respect to an annular wall of a rigid structure. The expansion ring assembly includes a drive mechanism for engaging and driving apart the opposing ends of an expansion ring to thereby radially expand the ring. The drive mechanism generally includes a pair of block members, formed of steel or a rigid plastic, for example, having oppositely threaded bores therethrough, and a bolt having oppositely threaded ends which are threaded within respective threaded bores of the block members. The block members are interlockingly engaged with respective opposite ends of the expansion ring. Rotation of the bolt in a first direction simultaneously drives the block members apart from one another along the bolt to radially expand the expansion ring, and rotation of the bolt in a an opposite, second direction simultaneously drives the block members toward one another along the bolt to allow the expansion ring to radially contract.

Abstract: A gasket and mandrel assembly, including a gasket having an annular main body portion with an anchor flange and a pipe sealing portion. The gasket is foldable between a folded position in which the pipe sealing portion is disposed substantially within the main body portion and an unfolded position in which the pipe sealing portion extends outwardly of the main body portion along its longitudinal axis. A pair of mandrels are respectively fitted on opposite sides of the folded gasket to enclose most of the gasket for casting the gasket within a wall in a concrete structure. At least one of the mandrels includes an annular outer surface aligned parallel or substantially parallel with the longitudinal axis of the gasket.

Abstract: An expansion ring assembly for sealing a gasket with respect to an annular wall of a rigid structure. The expansion ring assembly includes a drive mechanism for engaging and driving apart the opposing ends of an expansion ring to thereby radially expand the ring. The drive mechanism generally includes a pair of block members having threaded bores therethrough, and a bolt having oppositely-threaded ends which are threaded within respective threaded bores of the block members. The bolt additionally includes tool-receiving structure, such as a nut portion, which may be engaged by a suitable tool to rotate the bolt. The block members are respectively engaged with opposite ends of the expansion ring.

Abstract: A waterstop ring provides a flexible joint connection between a pipe and a concrete structure. The waterstop ring includes an annular waterstop member projecting from an outer circumference thereof, and a pair of annular shoulder portions respectively disposed on each side of the waterstop member. The waterstop member and each of the shoulder portions each include hollow annular cavities defined therein, such that when the waterstop ring is installed in a connection between a concrete structure and a pipe, and partially embedded within the concrete structure, the annular cavities allow deformation of the waterstop ring and thereby allow tilting movement of the pipe in a direction away from the central axis of the pipe.

Abstract: An attachment mechanism for a hole form that is used to secure the hole form to a form wall during a casting process. The attachment mechanism includes a hole form having an opening formed in the face thereof and a magnet assembly which is received in the opening of the hole form. The magnet assembly can include a flange portion which can be received in a corresponding stepped portion of the opening. The magnet assembly is removable and can be used in other hole forms.

Abstract: Interlocking end members for expandable compression rings. Compression rings are formed by attaching the interlocking members to the ends of a flexible strip and coupling the interlocking members together. The interlocking members include a recess for receiving the ends of a flexible strip and a jaw structure for engagement with one another. The jaw structure includes two or more offset opposed jaw members which include angled teeth. The teeth of opposed jaw members of coupled interlocking members engage one another in a locking relationship, whereby the resulting compression ring can be expanded and locked into a range of positions.

Abstract: A folded annular gasket is cast into an opening in the wall of a manhole and held in a compressed state by an annular support. The annular support includes a helical strip which can be stripped apart to remove the annular support from within the annular folded gasket. A pipe to be connected to the manhole is inserted into the annular support. After the pipe is inserted in the annular support, the annular support is stripped out from between the folded annular gasket and the pipe. Removal of the annular support causes the folded annular gasket to press against the pipe and thereby form a seal. Removal of the annular support can also cause the folded annular gasket to invert. The inverted part of the annular gasket can be clamped to the pipe and function as a boot or sleeve.

Abstract: An integrally molded compression ring for exerting an outwardly, radially directed force on an inner surface of a gasket to compress the gasket into sealing engagement with a wall of an opening. The compression ring is made from a one-piece body or strip of resiliently flexible material that has a substantially continuous and uninterrupted exterior circumferential surface. Lugs formed on an interior portion of the strip cooperate with a force expansion unit to move the ring into an expanded position. A recess may also be provided in one end of the strip for cooperating with the force expansion unit. Projections integrally molded on an interior portion of the strip and on an exterior portion adjacent an end of the strip engage one another to lock the ring in an expanded position. Guiding structure may be formed on the strip that prevent lateral movement of the ends of the strip relative to one another when the strip is formed into a ring.

Abstract: An integrally molded compression ring for exerting an outwardly, radially directed force on an inner surface of a gasket to compress the gasket into sealing engagement with a wall of an opening. The compression ring is made from a one-piece body or strip of resiliently flexible material that has a substantially continuous and uninterrupted exterior circumferential surface. Lugs formed on an interior portion of the strip cooperate with a force expansion unit to move the ring into an expanded position. A recess may also be provided in one end of the strip for cooperating with the force expansion unit. Projections integrally molded on an interior portion of the strip and on an exterior portion adjacent an end of the strip engage one another to lock the ring in an expanded position. Guiding structure may be formed on the strip that prevent lateral movement of the ends of the strip relative to one another when the strip is formed into a ring.

Abstract: An annular gasket is disclosed which may be used in concrete manhole structures and pipe structures. An embodiment of the invention includes an annular body positioned to lie in a joint between two surfaces such as a wall and an outer surface of a pipe or an inner surface of one pipe and the outer surface of another pipe, structure for anchoring the body within the wall or pipe so that the body lies adjacent the wall or pipe, a sleeve having first and second folds, structure for coupling the sleeve to the body so that the sleeve is movable between a folded position adjacent the body and an unfolded position around the outer surface of the pipe, and structure for the securing the sleeve in the folded position.

Abstract: An apparatus for outwardly radially compressing a gasket into sealing engagement with a wall of an opening includes a continuous strip of resiliently flexible material having first and second ends and first and second members. The first and second members are made from a different material than the strip and are respectively attached to the first and second ends of the strip to thereby form a ring. The first and second members are configured to include locking structure that both fixes the ring in an expanded position adjacent to the gasket and secures against contraction of the ring by the gasket. The apparatus may be made from a plurality of continuous strips of resiliently flexible material and have structure for aligning and securing the first end of each one of the strips adjacent the second end of another of the strips to form a closed ring. The aligning and securing structure includes at least one set of the first and second members.

Abstract: A gasket adapter for providing a sealing surface on a ribbed conduit is disclosed. The adapter is fabricated from an elastomeric material and includes a smooth, cylindrical outer surface adapter to mate with a conventional gasket employed between an opening and a conduit, or between aligned conduits. The inner surface of the adapter comprises a series of peaks and valleys which are adapted to nest with the peaks and valleys of a conduit surface. The adapter is initially fabricated with its cylindrical surface as its inside surface so that the adapter may be installed on the ribbed conduit and then inverted to provide the smooth outer sealing surface.

Abstract: An arrangement for radially expanding a tubular gasket includes a sliding sleeve and a compression sleeve. The sliding sleeve is formed of a thin membrane of relatively rigid material, such as nylon, hypalon or polyester. The sliding sleeve is positioned adjacent an inner surface of that portion of the tubular gasket to be expanded. The compression sleeve is disposed immediately adjacent the sliding sleeve such that the sliding sleeve serves as a slip plate for the compression sleeve when the sleeves are expanded against the inner surface of the tubular gasket. The sliding sleeve may be attached to or integrally molded into the inner surface of the tubular gasket. Another aspect of the invention involves forming the compression sleeve so as to allow it to be locked in any one of a plurality of expanded positions.

Abstract: A gasket is formed with a mounting portion which is generally cylindrical, and provides an anchoring projection extending radially from the outer side thereof. A sealing projection is joined to the mounting portion by a hinge section. The sealing projection is placed in compression when the gasket is formed into a circle, and becomes bistable. In one position of stability, the sealing projection is substantially aligned with the mounting portion, and in the other position of stability, the sealing projection is located generally within the mounting portion. The gasket is positioned around a core, with the sealing projection aligned with the mounting portion, and is cast into an opening provided by the material of the manhole riser. In such position, the sealing projection is partially embedded within the material of the riser. Prior to installation of a sewer pipe, the sealing projection is manually released from the material of the riser and is pushed through to its other position of stability.

Abstract: A gasket system for providing a fluidtight joint between a manhole riser and a sewer pipe. The gasket is formed with a mounting portion which is generally cylindrical, and provides an anchoring projection extending radially from the outer side thereof. A sealing projection is joined to the mounting portion by a hinge section. The sealing projection is placed in compression when the gasket is formed into a circle, and becomes bistable. In one position of stability, the sealing projection is substantially aligned with the mounting portion, and in the other position of stability, the sealing projection is located generally within the mounting portion. The gasket is positioned around a core, with the sealing projection aligned with the mounting portion, and is cast into an opening provided by the material of the manhole riser. In such position, the sealing projection is partially embedded within the material of the riser.

Abstract: Improvements in the technique of sliplining a buried pipe, so as to minimize adverse affects of differences in expansion and contraction of the old and new pipe, while maintaining seals at the ends thereof is disclosed employing at each pipe end a sleeve-like pliable gasket, which is expanded outwardly into contact with the inner surface of the old pipe, and somewhat beyond the end of the old pipe, is contracted inwardly into contact with the other surface of the new or sliplined pipe. The sleeve-like gasket can compensate for thermally induced pipe line and liner axial length changes, without breaking the seal between the two, while seal installation is facilitated by the accessability of the sleeve-like gaskets extending beyond the ends of the old pipe.

Abstract: Improvements in the technique of sliplining a buried pipe, so as to minimize adverse affects of differences in expansion and contraction of the old and new pipe, while maintaining seals at the ends thereof is disclosed employing at each pipe end a sleeve-like pliable gasket, which is expanded outwardly into contact with the inner surface of the old pipe, and somewhat beyond the end of the old pipe, is contracted inwardly into contact with the other surface of the new or sliplined pipe. The sleeve-like gasket can compensate for thermally induced pipe line and liner axial length changes, without breaking the seal between the two, while seal installation is facilitated by the accessability of the sleeve-like gaskets extending beyond the ends of the old pipe.

Abstract: This invention relates to a gasket apparatus for providing a fluid tight seal between a pipe and a porthole in the wall of a manhole riser. The apparatus includes an elongated sleeve of elastomeric material, the sleeve having at one end an outwardly turned, reflexly curved annular flange. The body portion extends axially beyond the flange. A rigid reinforcing ring coaxially engages the inner surface of the flange, forming said flange to a predetermined outside diameter. This apparatus is inserted into the porthole in coaxial sealing relationship therewith. The flange is radially compressed between the ring and the wall of the porthole thereby providing a seal. The end of the pipe is received by the sleeve which is clamped at the distal end thereof onto the pipe to provide a further seal.The method of forming the seal includes inserting a solid, substantially rigid ring into the end portion of an elastomeric elongated sleeve which thereby determines the outer diameter of the sleeve radially opposite the ring.

Abstract: A two part sleeve gasket is provided for sealing between a pipe and a hole receiving the pipe, such as a porthole in a manhole. The gasket includes a first annular element of resilient elastomeric material having a generally tubular body portion and an outwardly, reflexly curved flange radially spaced therefrom. The flange is generally tubular and shorter in length than the body portion. A second annular element resembling an O-ring of elastomeric material surrounds the body portion in the radial space defined by the flange, the flange being radially flexible into engagement with the wall of the hole and the second annular element being elastically deformable upon being radially compressed between the flange and the body portion. The invention also comprehends the method of installing the aforesaid gasket.