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A closure for a large diameter circular opening such as the end of a tubular conduit subjected to internal positive pressure comprises a coaxial cover lid that may be opened only when a pressure relieving venting valve is opened, the cover lid being connected over the opening by screw threaded means

A closure for a large diameter circular opening such as the end of a tubular conduit subjected to internal positive pressure comprises a coaxial cover lid that may be opened only when a pressure relieving venting valve is opened, the cover lid being connected over the opening by screw threaded means of larger diameter than the inside diameter of the opening, and the venting valve having a removable closure cap which impedes removal of the lid until the internal pressure is vented.

대표청구항 ▼

In a closure arrangement for means defining a space adapted to contain fluid under pressure comprising a cylindrical chamber portion having an opening at one end surrounded by a rim member, a removably mounted cover member for said opening, said cover member being formed with external threads, means

In a closure arrangement for means defining a space adapted to contain fluid under pressure comprising a cylindrical chamber portion having an opening at one end surrounded by a rim member, a removably mounted cover member for said opening, said cover member being formed with external threads, means pivotally mounting said cover member for swinging movement only about an axis normal to the axis of said opening, an annular projection on said cover member extending within said opening, seal means between said projection and the interior of said opening, an annular retainer being internally threaded and rotatably and axially displaceably mounted on said externally threaded cover member and so connected to the rim member that upon rotation of said retainer in one direction the cover and rim members are forced toward pressure tight association, said retainer being divided into two segments secured together, said space defining means further comprising axially shiftable means mounted adjacent said rim member, said retainer having inclined cam surfaces thereon cooperating with said axially shiftable means whereby action of said axially shiftable means against said cam faces causes the initial threads of said cover member and retainer to become engaged, a vent valve assembly comprising means defining a bore through said cover member a tube extended from said bore and terminating in a vent end portion disposed substantially radially with respect to the axis of said chamber portion opening, and a removable vent closing element on said vent end portion movable radially inwardly, with respect to said chamber axis, to a vent closing position and stop means on said retainer for cooperating with said vent closing element to prevent rotation of said retainer in the opposite direction when said vent closing element is in said vent closing position whereby substantial displacement of said cover member away from said opening is permitted only when said vent element is removed from said vent end portion. In a closure arrangement for means defining a space adapted to contain fluid under pressure comprising a cylindrical chamber portion having an opening at one end surrounded by a rim member, a removably mounted cover member for said opening, means pivotally mounting said cover member for swinging movement only about an axis normal to the axis of said opening, an annular projection on said cover member extending within said opening, seal means between said projection and the interior of said opening, an annular retainer rotatably and axially displaceably mounted on one of said members by means of screw threads and so connected to the other member that upon rotation of said retainer in one direction the cover and rim members are forced toward pressure tight association, a vent valve assembly comprising means defining a bore through one of said members, a tube extended from said bore and terminating in a vent end portion disposed substantially radially with respect to the axis of said chamber portion opening, and a removable vent closing element on said vent end portion movable radially inwardly, with respect to said chamber axis, to a vent closing position and stop means on said retainer for cooperating with said vent closing element to prevent rotation of said retainer in the opposite direction when said vent closing element is in said vent closing position whereby substantial displacement of said cover member away from said opening is permitted only when said vent closing element is removed from said vent end portion.