초록 ▼

This invention relates to a radially expandable locking sleeve device and to a gasket apparatus for providing a fluid tight seal between a pipe and a porthole in the wall of a manhole riser. The gasket is in the form of a tubular element of elastomeric material. An annular recess is provided in the

This invention relates to a radially expandable locking sleeve device and to a gasket apparatus for providing a fluid tight seal between a pipe and a porthole in the wall of a manhole riser. The gasket is in the form of a tubular element of elastomeric material. An annular recess is provided in the inner surface of the gasket near one end for receiving a radially expandable split sleeve having interlocking end portions. The outer circumferential surface of the locking sleeve is so arranged as to continue uninterruptedly across the area of the interlocking end portions, and the end portions when engaged lock against both lateral displacement and circumferential collapsing of the sleeve.

대표청구항 ▼

An expandable locking sleeve for use in radially expanding a tubular gasket of elastomeric material into compressive sealing engagement with the wall of a cylindrically shaped opening and comprising a cylindrical relatively stiff but resiliently flexible strip of metal having opposed abuttably engag

An expandable locking sleeve for use in radially expanding a tubular gasket of elastomeric material into compressive sealing engagement with the wall of a cylindrically shaped opening and comprising a cylindrical relatively stiff but resiliently flexible strip of metal having opposed abuttably engageable ends, said strip being movable between two positions in which end portions thereof may first be radially overlapped and secondly may be interlockingly engaged end-to-end, the first of said end portions having a short substantially flat sided channel-shaped portion provided with a recess disposed between the opposite side edges of the strip and extending circumferentially from and opening through the end edge of said first end portion, said channel-shaped portion having two opposed retaining shoulders extending in a direction substantially circumferentially of said strip from said end edge which further define said recess, the second of said end portions having a longitudinally projecting tab, said second end portion also having a radially inwardly displaced step portion, said tab being adapted to be slidably received by said recess between said retaining shoulders with the end edge of said first end portion in juxtaposed abuttable alignment with said step portion, two ledge portions on said first end extending laterally opposite and integrally from said two retaining shoulders, respectively, said ledge portions being substantially flat and displaced radially opposite from the outer surface of said channel-shaped portion substantially in parallelism therewith, said ledge portions also extending back from said first end edge, stepped side portions connecting said ledge portions to said retaining shoulders, respectively, and forming an integral part thereof, said second end having two circumferentially extending substantially flat fingers on opposite sides, respectively, of said tab, said fingers being engageable in radially overlying relation with said ledge portions, respectively, when said tab is received by said recess, the radially outer surface of said tab or channel-shaped portion being of extended area lying substantially within the circumferential outer surface of said strip as a substantially uninterrupted cylindrical circumferential continuation thereof when said tab is engaged with said recess and said first end edge is immediately adjacent to said step portion.