Attachment for fluid dispenser

Claim 1

An attachment for a fluid dispenser of the type having a barrel having a central bore therein through which fluid is dispensed, said attachment comprising a body member having a bore passing longitudinally therethrough, said longitudinal bore in said body member being adapted to receive said barrel of said fluid dispenser in snugly fitting relation, a frustoconically shaped adapted having a bore coaxial with the central axis thereof, said adapter being sized to fit into an opening in the end of a sleevelike portion of a flexible film container, said adapter being connected to said body member by a cylindrically shaped tube coaxial with said adapter and threadedly attached to said body member coaxially with said longitudinal bore therein, said tube having an internal diameter to snugly receive at least a portion of said barrel therein, a cylindrically shaped expansion sleeve of resilient material fitting snugly about said cylindrically shaped tube between said adapted and said body member, a cylindrically shaped collar fitting loosely about said expansion sleeve and having an inwardly flanged portion at one end thereof defining a centrally located opening through which said tube extends to said body member, said cylindrically shaped collar being open at its other end to receive said sleevelike portion of said flexible film container between the inner wall thereof and the outer wall of said expansion sleeve, said expansion sleeve being held between the internal surface of the inwardly flanged portion of said cylindrically shaped collar and the rear surface of said adapter, and mean for forcing said collar to move along said tube away from said body member, whereby said expansion sleeve is compressed from end to end between said inwardly flanged portion of said collar and the rear surface of said adapter and thereby expanded circumferentially to form a positive seal between said sleeve, said sleevelike portion of said flexible film container, and said collar.