Patent ID: 6705350
Filing Date: 2004-03-16
Classification: F16L

Abstract:
A plug for a pipeline fitting comprising:a cylindrical body having at its circumferential surface an annular groove, wherein an upper surface of said cylindrical body is provided with threaded holes to be engaged with by screws, and wherein said cylindrical body is centrally formed at its upper surface with a circular recess; an O-ring fitted in the annular groove of the cylindrical body; an expanding plate having a circumferential outer edge to be insertable into an annular groove formed at an inner surface of the pipeline fitting, wherein said expanding plate is divided into a pair of semicircular plates and is provided with a central opening having a minor axis in the direction of expansion of the expanding plate and a major axis in the direction perpendicular to the expansion, and wherein said expanding plate is provided with a plurality of elongated holes corresponding to the screws of the cylindrical body allowing the expanding plate to be coupled to the cylindrical body by the screws, the semicircular plates being provided with pins, wherein the pins are symmetrical to each other with respect to a dividing line of the expanding plate; and an expanding device causing the outer edge of the expanding plate to be inserted into the annular groove of the pipeline fitting, wherein said expanding device comprises a lower disc inserted into the circular recess of the cylindrical body, an upper disc having a pair of curved elongated holes into which the pins of the expanding plate are inserted and which is adapted to move the pins received therein outwardly, an annular groove formed between the upper disc and the lower disc into which inner edges of the semicircular plates of the expanding plate are inserted, and a connecting projection to be connected to a plugging machine.