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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

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. The expansion assembly includes the aforementioned piston cylinder assembly which cooperates with an hydraulic jack and is positioned with its projections against the grooves of the clamping band to expand the clamping band into a locked position against the gasket flange and to apply a force directly upon the clamping band to insure proper positioning the locking of the clamping band. The hydraulic jack may also include a swingable member having a free end which moves along a curved path to follow the movement of the clamping band as it expands. The initial configuration of the gasket expedites the insertion, expansion and locking of the clamping band.

대표청구항 ▼

In a combination, a gasket assembly for providing a water-tight seal with an opening having a surface for supporting the gasket assembly and an expansion means for installing said gasket assembly, comprising: a substantially tubular-shaped gasket having a hollow interior and being, formed of a resil

In a combination, a gasket assembly for providing a water-tight seal with an opening having a surface for supporting the gasket assembly and an expansion means for installing said gasket assembly, comprising: a substantially tubular-shaped gasket having a hollow interior and being, formed of a resilient compressible material and having an end portion adapted to be positioned against the surface of the opening; an annular clamping band formed of a material substantially impervious to corrosive influenced normally encountered in sewage systems and arranged to be positioned against the inner periphery of the end portion positioned within said opening; said band having a discontinuity to define first and second ends thereof; said first and second ends being positionable in abutting relationship to lock the band against the outer flange and maintaining the outer flange under compression between said band and said gasket supporting surface; said band encircling a hollow region when said first and second ends are in abutting relationship; said expansion means being releasably positioned within the hollow region surrounded by said clamping band for expanding the clamping band outwardly and against the outer flange so that substantially all of said expansion means is in said hollow region; said expansion means including first and second member engaging the clamping band and means for moving said first and second members apart; said first and second members having projections with elongated ends engaging the clamping band for expanding the clamping band when the first and second members are moved apart; the inner periphery of the band being provided with first and second elongated grooves each arranged a spaced distance inward from said first and second ends, at least one of said grooves receiving the elongated end of one of said projections. In combination, a gasket assembly for providing a water-tight seal with an opening having a surface for supporting the gasket assembly, and an expansion means for installing said gasket assembly, comprising: a substantially tubular-shaped gasket formed of a resilient compressible material and having an end portion adapted to be positioned against the surface of the opening; an annular clamping band formed of a material substantially impervious to corrosive influences normally encountered in sewage systems and arranged to be positioned against the inner periphery of the end portion position within said opening; said band having a discontinuity to define first and second ends thereof; said first and second ends being positionable in abutting relationship to lock the band against the outer flange and maintaining the outer flange under compression between said band and said gasket supporting surface; said expansion means being releasably positioned within said clamping band for expanding the clamping band outwardly and against the outer flange; said expansion means including first and second members engaging the clamping band and means for moving said first and second members apart; said first and second members having projections engaging the clamping band for expanding the clamping band when the first and second members are moved apart; the inner periphery of the band being provided with first and second elongated grooves each arranged a spaced distance inward from said first and second ends, at least one of said grooves receiving one of said projections; the clamping band being provided with a groove along the inner periphery thereof spaced inwardly from said first end; the projection of said first member being positioned in said groove and the projection of said second member engaging the second end of said band for expanding said clamping band as said first and second members are moved apart; said expansion means comprises an expansion jack for moving said first and second members apart; said expansion jack comprising a cylinder; a piston arranged for reciprocating movement in the cylinder; a piston rod coupled to said piston and extending outwardly from said piston and beyond one end of said cylinder; one of said first and second members being pivotally mounted to said cylinder and having one surface portion being slidably engaged by the free end of said piston rod to move the free end of the pivotally mounted member along a curved path; and the remaining one of said first and second members being coupled to said cylinder.