| 摘要 |
<p>An apparatus for plugging the interior of a pipe having an internal cylindrical surface, the pipe being penetrated by an access opening, the plugging device comprising: an upright tubular plugger housing having means at a lower end for attachment to a pipe in communication with an opening in the pipeline; an elongated vertical cylindrical control bar having a plugger at a lower end thereof, the plugger being operable to plug a pipe after it has been inserted through an opening into the pipe, comprising: an arrangement of a collar and first and second closure plates with respective truncated spherical surfaces to allow swivelling of a control bar placed therethrough in order to position the plugger in the pipe. or a control bar formed of two concentric members each provided with manipulating means. <IMAGE></p> |
