Patent ID: 6688495
Filing Date: 2004-02-10
Classification: B65D

Abstract:
A backflow preventive tube-type container comprising:a tube-type container main body for storing a fluid therein, said main body having a mouth portion for discharging the fluid, said main body being elastic when the fluid is stored therein; a cylinder-shaped material fitted in the mouth portion, said cylinder-shaped material having at a bottom an opening through which the fluid passes; a valve body comprising a convex portion configured to be liquid-tightly fitted in the opening, said valve body being movable in said cylinder-shaped material only in its axial direction; and a support for limiting movement of the valve body away from the opening, wherein when the main body is pressed by external force, the fluid pushes the valve body and is discharged through the opening, and when the external force is released, the pressure inside the main body becomes lower than the pressure outside the main body due to elasticity of the main body, thereby retracting the fluid at the opening and closing the valve body, wherein the support comprises (i) a perforated elastic cylindrical member attached under the cylinder-shaped material and having a central opening, and (ii) a connecting member having a head having a larger diameter than a diameter of the central opening, wherein an end of said connecting member opposite to the head is inserted through the central opening and attached to a tip of the convex portion.