JPH0343181U - - Google Patents

Description

[Brief explanation of drawings]

The drawings show an embodiment of the invention; FIG. 1 is a schematic sectional view, FIG. 2 is a sectional view showing the state of use, and FIG. 3 is an exploded perspective view. P...Bag body, P1...Outer bag, P2...Inner bag, 1
...Outer pipe part, 1A...Bent end, 2...Inner pipe part, 2
A...Folded end.

Claims (1)

[Claims for Utility Model Registration] 1. An outer tube portion that forms a double tube shape with the tip of a flexible tubular member folded inward and is attached to a predetermined opening of the bag, and this outer tube portion. 1. A double-tubular check valve, characterized in that an inner tube portion inserted into a bag body is formed at the inner side of the double-tube check valve, and both side edges of the flat overlapping inner tube portion are joined at appropriate positions. 2. Utility model registration claim 1, characterized in that the distal end edge of the inner tube section within the outer tube section is configured such that approximately half the circumference thereof is stepped from the other half circumference. double tubular check valve. 3. A request for utility model registration characterized in that the folded portion of the end of the outer tube that protrudes from the surface of the bag is configured such that about half of its circumference is stepped from the other half of its circumference. A double tubular check valve according to claim 1 or 2. 4. A utility model according to claims 1 to 3, characterized in that a pair of rectangular sheets folded approximately in half are polymerized in a facing state, and the polymerized longitudinal side edges are respectively joined together. Double tubular check valve.