Abstract: A resilient compressible gasket having an embedment portion, a pipe engaging portion and a intermediate “radius” portion integral with the embedment and pipe engaging portions. The gasket assumes a “pleated” configuration when in the operative position, the pipe engaging portion extending through the embedment portion, yielding a gasket which compensates for deviation of the pipe from a nominal horizontal alignment without any reduction in the water-tight seal provided by the gasket. The gasket is sized to provide for easy insertion of a corrugated pipe into the pipe engaging portion while providing an excellent water-tight seal when clamped into position about one or more annular recesses and peaks of the corrugated pipe. Another embodiment of the gasket is designed to be secured to a cored or performed opening in a cast member through the use of an expansion-type clamping assembly.

Abstract: A placement ring assembly has inside and outside mandrels releasably fastened together to secure and align a pipe connector gasket therebetween. A permanent magnet of a magnet assembly is inserted through co-aligned openings in the mandrels and is magnetically attracted to an inner-core of a casting assembly. When the cast member is set, a mechanical release is rotated to release the magnetic attraction between the permanent magnet and the mold core. One of the mandrels may be provided with shock absorbing knockout pads while the other mandrel has openings aligned with the knockout pads to enable the knockout pads to be struck with a hammer to separate the mandrels. Rubber cushioning members absorb the shock of the impacts, protecting the mandrel from permanent damage. One-piece hole formers may likewise be provided with a magnetic assembly having a mechanic release as well as knock-out pads.

Abstract: A placement ring assembly has inside and outside mandrels releasably fastened together to secure and align a pipe connector gasket therebetween. A permanent magnet of a magnet assembly is inserted through co-aligned openings in the mandrels and is magnetically attracted to an inner-core of a casting assembly. When the cast member is set, a mechanical release is rotated to release the magnetic attraction between the permanent magnet and the mold core. One of the mandrels may be provided with shock absorbing knockout pads while the other mandrel has openings aligned with the knockout pads to enable the knockout pads to be struck with a hammer to separate the mandrels. Rubber cushioning members absorb the shock of the impacts, protecting the mandrel from permanent damage. One-piece hole formers may likewise be provided with a magnetic assembly having a mechanic release as well as knock-out pads.

Abstract: An extruded gasket being formed of a suitable resilient, compressible material through out the body thereof to facilitate controlling critical gap dimensions measured between the components having the gasket arranged in said gap to provide an excellent water-tight seal. The gasket material is of a softer durometer than that of prior art gaskets and includes a relief section providing sufficient mechanical softness to allow the gasket to compress more easily in the region of the relief section.

Abstract: A bidirectional gasket providing a water-tight seal between a manhole assembly and a pipe, having a T-shaped anchoring portion for embedment in a manhole opening. An A-shaped pipe engagement portion joined to the anchoring portion by a connecting web facilitates bending of the gasket. The A-shaped portion has "legs" and recesses forming water pockets preventing water from entering between gasket and pipe. The gasket durometer enhances the water tight seal of the legs with increasing water pressure. The pipe engaging portion accommodates a greater outside pipe diameter compared with conventional connectors due to reduced volume, by providing voids within the connector. The gasket accommodates diameter deflection or ovation in rigid and flexible pipe materials. The A-shaped profile provides greater angular deflection and/or pipe misalignment allowance compared with conventional connectors.

Abstract: A lift pin insert assembly is releasably mounted upon a mold member for casting a manhole section. The mold is filled with concrete, which surrounds and embeds the insert assembly in the cast member. The insert is configured to receive a lift pin, which is automatically moved to a locked position when a lifting force is applied. The insert assembly includes a reinforcing support assembly having at least a face plate and a metal rod of suitable thickness engaging the insert, and anchored either to the face plate or an additional support plate. The support assembly distributes the forces applied by the lifting force to the cast member substantially uniformly over a large surface area, significantly increasing the weight load capable of being lifted by a given lift pin without increasing the size and/or diameter of the lift pin and blocks the lift pin from sliding out of the insert when the cast member is lifted by the lift pin.

Abstract: A lift pin insert assembly is releasably mounted upon a mold member for casting a manhole section. The mold is filled with concrete, which surrounds and embeds the insert assembly in the cast member. The insert is configured to receive a lift pin, which is automatically moved to a locked position when lifting tension is applied. A reinforcing support assembly includes at least a face plate and a metal rod of suitable thickness at least partially encircling the insert, and anchored either to the face plate or an additional support plate. The support assembly distributes the forces applied by the lifting force to the cast member substantially uniformly over a large surface area, significantly increasing the weight load capable of being lifted by a given lift pin without increasing the size and/or diameter of the lift pin.

Abstract: A watertight chimney assembly prevents infiltration of water in the region between a manhole cover support frame and a concrete manhole assembly. The watertight chimney, in one embodiment, is comprised of a pair of tubular telescoping sleeves each provided with a flange for mounting respectively to and between the top lip of a manhole assembly and the bottom surface of a flange on the cover support frame supported a desired distance above the top of the manhole assembly to maintain the cover frame at proper grade. An O-ring seated within an annular groove provided in one of the tubular sleeves provides a sliding watertight seal therebetween. The sleeve flanges are arranged and compressed between the cover support frame and manhole assembly and contribute to the watertight seal. One of the sleeves is reversible to increase the telescoping range between a minimum and a maximum extension. In an alternative embodiment, the internal surface of the manhole opening constitutes one of the telescoping members.

Abstract: A gasket for providing a watertight seal between an opening and a cast member and a conduit extending into said cast member, the gasket being an annular member having an outer circumferential portion of inverted T-shaped cross-section for embedment into the opening of the cast member and a flexible web-like portion extending inwardly from said anchoring portion and terminating in an annular enlarged beaded portion. The length of the web is greater than the distance between the outer diameter of the beaded portion and the inner diameter of the anchoring portion to form a curved configuration. The beaded portion has an inner diameter adapted to cause the beaded portion to undergo at least slight expansion when a conduit is pushed through the central opening defined by the beaded portion whereby the over-center position of the beaded portion may be reversed simply by movement of the pipe.

Abstract: A bidirectional gasket providing a water-tight seal between an opening in a manhole assembly and a pipe extending into said opening, comprises a T-shaped anchoring portion for embedment in a manhole opening A substantially A-shaped pipe engagement portion is joined to the anchoring portion by a slender connecting web facilitating bending of the gasket. The A-shaped portion has "legs" and recesses which form water pockets preventing water from entering. The durometer of the gasket material enhances the water-tight seal of the legs with increasing water pressure. The pipe engaging portion accommodates a greater outside pipe diameter compared with conventional connectors due to reduced volume, by providing voids within the connector together and a lower durometer of gasket material. The gasket has enhanced ability to accommodate diameter deflection or ovation in rigid and flexible pipe materials.

Abstract: Cast members are provided with a liner assembly to protect the cast material from corrosion. The liner assembly is formed of a plurality of curved liner sections having integral joining flanges. A resilient compressible gasket is arranged between opposing flanges and is provided with at least one flange receiving slot for receiving the flange of one of said liner sections to facilitate assembly thereof. Fastening means join the opposing flanges to compress the gasket and thereby provide a liquid-tight joint. Integral flanges are provided at the upper and lower ends of the liner sections to receive a sealant which is squeezed out of the seams formed by the mating sections when joined to protect the cast assembly from corrosion. The liner sections are formed of a material which is inert to the corrosive influences.

Abstract: An expansion band having a spanning member whose free end is provided with a locking tab for cooperation with a locking surface having a plurality of selectable locking slots. A guide channel secured to the band cooperates with the band to define a guideway through which the spanning member extends thereby maintaining the spanning member and hence the free ends of the expansion band in alignment. During expansion of the expansion band the locking tab is free to snap out of each locking slot and into the next. Upon release of the expansion forces, however, the locking tab is prevented from snapping out of the locking slot in which it is presently inserted. A novel expansion unit comprised of a manual hydraulic pump operates a duck-bill type spreader which bears against associated bearing surfaces respectively provided on one end of the spanning member and one end of the guide channel to apply direct expansion forces to the expansion band.

Abstract: A resilient gasket having an outer flange positioned within a manhole opening and held by a compression band. The gasket has a central opening with an enlarged beaded periphery to encircle a pipe. A tapered intermediate section is joined to the outer flange and the beaded periphery. The intermediate section folds after insertion and clamping in an opening to form diagonally aligned annular portions defining a V-shaped yieldable gasket to maintain a watertight seal between opening and pipe, even when misaligned. A strap encircling the gasket next to the beaded periphery enhances the watertight seal between gasket and pipe. The clamping band has grooves which cooperate with projections of a piston cylinder assembly. The clamping band is formed of material impervious to the surrounding environment.

Abstract: A metallic clamping band of channel-shaped cross-section is arranged in a ring-shaped manner and has a discontinuity so as to define two adjacent free ends thereof. A curved channel-shaped insert has one of its ends welded to one end of said clamping band while the other of its ends is free to slidably engage the remaining end of the clamping band. The remaining end of the clamping band is provided with a plurality of openings arranged at spaced intervals along each of the sidewalls of the channel shaped member to define a plurality of pairs of openings. A locking pin is insertable into one of said pairs of openings to engage the free end of the insert portion and thereby maintain the clamping band in the expanded and locked position. The free end of the insert preferably has an extending tongue adapted to be positioned between the locking pin and the base of the clamping band when in the locked position.

Abstract: Method and apparatus for providing liners in manhole assemblies, which liner is comprised of a plurality of liner sections joined together to form the inner corrosion resistant surface of each manhole member. The liner section define the inner surface of the manhole member being molded. Cast material is poured into the mold and allowed to set. The liner surface engaging the cast material contains integral substantially T-shaped projections which anchor the liner sections to the cast member. The tops and bottoms of each liner section extend around the surface of the section engaging the next adjacent section joined thereto to prevent toxic materials from reaching a cast material. The liner sections are theroplastic vacuum formed whereby the sheet forming the liner section is drawn against substantially T-shaped strips arranged upon the mold member within the vacuum thermo-forming equipment to provide the aforementioned integral T-shaped anchoring projections.

Abstract: A clamping band for clamping a resilient gasket against an opening within a wall to provide a fluid-tight seal therebetween. The clamping band is generally circular-shaped and has an elongated slot extending inwardly from one free end of the clamping band and cooperates with an elongated projection of reduced cross section as compared with the nominal cross section of the clamping band and which is provided at the opposite end of the band. The projection is inserted into the slot, the clamping band is placed against the gasket arranged within the aforesaid opening and the gasket is expanded a predetermined amount by an hydraulic expander to exert the desired clamping pressure upon the resilient gasket. One surface of the projection is provided with a series of teeth. An opening communicating with said slot receives a wedge fitted into said opening and having several teeth along one surface thereof, which teeth conform to the teeth of said projection.

Abstract: A hollow, flexible, bendable, cylindrical-shaped, hat-like sleeve is water-tightly joined with the upper end of the riser section of a manhole structure. The free end of the sleeve is trimmed so that its upper edge fits beneath the shoulder of the frame supporting the manhole cover to prevent subsurface water from entering into the manhole interior through the regions between the manhole cover supporting frame and the top of the riser section, which is usually fitted with adjustment rings to bring the manhole cover frame up to grade. The sleeve is easily cut to any height to accommodate either a greater or lesser number of height adjustment rings. The sleeve flange is cast into the riser section. The sleeve may be folded into itself to significantly lower its profile to expedite handling, transportation and assembly. A plastic clamping band may be placed into the interior of the sleeve to water-tightly join the upper end of the sleeve to the manhole cover support frame.

Abstract: A resilient gasket having an outer flange positioned within a manhole opening and held by a compression band. The gasket has a central opening with an enlarged beaded periphery to encircle a pipe. A tapered intermediate section is joined to the outer flange and the beaded periphery. The intermediate section folds after insertion and clamping in an opening to form diagonally aligned annular portions defining a V-shaped yieldable gasket to maintain a watertight seal between opening and pipe, even when misaligned. A strap encircling the gasket next to the beaded periphery enhances the watertight seal between gasket and pipe. The clamping band has free ends which cooperate with projections of a piston cylinder assembly. The clamping band is formed of material impervious to the surrounding environment.

Abstract: A hollow, flexible, bendable, cylindrical-shaped, hat-like sleeve is water-tightly joined with the upper end of the riser section of a manhole structure. The free end of the sleeve is trimmed so that its upper edge fits beneath the shoulder of the frame supporting the manhole cover to prevent subsurface water from entering into the manhole interior through the regions between the manhole cover supporting frame and the top of the riser section, which is usually fitted with adjustment rings to bring the manhole cover frame up to grade. The sleeve is easily cut to any height to accommodate either a greater or lesser number of height adjustment rings. The sleeve flange is cast into the riser section. The sleeve may be folded into itself to significantly lower its profile to expedite handling, transportation and assembly. A plastic clamping band may be placed into the interior of the sleeve to water-tightly join the upper end of the sleeve to the manhole cover support frame.

Abstract: A bidirectional gasket providing a water-tight seal between an opening in a manhole assembly and a pipe extending into said opening, comprises a T-shaped anchoring portion for embodiment in a manhole opening. A substantially A-shaped pipe engagement portion is joined to the anchoring portion by a slender connecting web facilitating bending of the gasket. The A-shaped portion has "legs" and recesses which form water pockets preventing water from entering. The durometer of the gasket material enhances the water-tight seal of the legs with increasing water pressure. The pipe engaging portion accommodates a greater outside pipe diameter compared with conventional connectors due to reduced volume, by providing voids within the connector together and a lower durometer of gasket material. The gasket has enhanced ability to accommodate diameter deflection or ovation in rigid and flexible pipe materials.