초록 ▼

A resilient gasket having an outer annular flange positioned within a manhole opening and maintained thereagainst under compression by means of a compression band. The gasket is provided with a central opening defined by an enlarged beaded periphery having an elasticity adapted to tightly encircle t

A resilient gasket having an outer annular flange positioned within a manhole opening and maintained thereagainst under compression by means of a compression band. The gasket is provided with a central opening defined by an enlarged beaded periphery having an elasticity adapted to tightly encircle the outer periphery of the pipe. A folded intermediate section is arranged between and integrally joined to the outer flange and the beaded inner periphery, the intermediate section is comprised of first and second diagonally aligned annular portions integrally joined along a fold to define a V-shape which imparts a yieldability enabling the gasket to maintain a watertight seal between the manhole opening and the pipe, even in the presence of a significant misalignment therebetween. A strap is positioned about the intermediate section of the gasket adjacent the inner beaded periphery to enhance the watertight seal between the gasket and the pipe. The compression band may be provided with pairs of substantially V-shaped slots which enable the band to assume a curvature in a direction transverse to the curved periphery in order to conform to the curvature of the manhole opening. The clamping band is formed of a material which is impervious to the surrounding environment and has a gap and a segment hingedly connected to the main body thereof for placement in said gap and against the interior surface of the gasket to lock the compression band in position and maintain the gasket flange under compression. An expansion assembly includes an expansion ring which cooperates with a hydraulic jack and is positioned against the compression band to expand the compression band into position against the gasket flange and to apply a force uniformly around the compression band to insure proper positioning and locking of the clamping band.

대표청구항 ▼

A gasket assembly for resiliently supporting a pipe within an opening and for sealing the annular region between the outer surface of the pipe and the surface of the opening, comprising: a gasket formed of a resilient, compressible material and having an outer flange adapted to be positioned against

A gasket assembly for resiliently supporting a pipe within an opening and for sealing the annular region between the outer surface of the pipe and the surface of the opening, comprising: a gasket formed of a resilient, compressible material and having an outer flange adapted to be positioned against the opening in which the gasket is placed; said gasket having a central opening defined by an annular shaped peripheral portion of substantially circular cross-section; an intermediate, substantially V-shaped, folded section comprised of first and second webs joined to one another along a common annular fold and further integrally joined respectively to said outer flange and said inner annular portion; an annular clamping band formed of a plastic material substantially impervious to corrosive influences normally encountered in sewage systems and arranged to be positioned against the inner periphery of said flange; said clamping band having a discontinuity and including an insertable segment positioned within the gap formed by said discontinuity when the clamping band is expanded against said outer flange to lock said clamping band and maintain said outer flange under compression, the interactive forces between the compressed flange and the clamping band serving to retain the clamping band and insertable segment in a locked position against the inner periphery of said flange, the outer periphery of said flange being pressed into intimate engagement with the surface of said opening.