Device for the releasable connection of a dual hose system to a closed container

Claim 1

For use with a coupling for the releasable connection of a dual hose, composed of an inner hose inside an outer hose, to a closed container, the coupling defining an axially extending passage for such inner hose and being composed of an inner coupling part fastened to the outer hose of the dual hose system and an outer coupling part detachably connected to the inner part and fastened to the closed container, the two parts being connected together to meet along a separating plane, a two-part plug arranged to be inserted into the passage defined by the coupling in the direction from the container, said plug being composed of an inner part and an outer part, said inner and outer parts being separable from one another and meeting along a separating plane coincident with the separating plane of the coupling when said plug is fully inserted into the coupling, each said part of said plug comprising two members which are axially movable relative to one another and an annular seal of a resiliently deformable material, said seal having a pair of opposed axial end surfaces, each bearing against a respective one of said members, and an external circumferential surface arranged to face the surface of the coupling which defines the axially extending passage, with the end of one of said members and the associated end of said seal being arranged to lie on said separating plane when said plug is fully inserted and that portion of said one member against which the associated end surface of said seal bears having the form of an oblique surface sloping radially outwardly relative to the body of said seal, whereby relative movement of said two parts in a direction to move said axial end surfaces of said seal toward one another causes said seal to deform radially outwardly to form a sealing connection with the surface of the coupling which defines the axially extending passage.