초록 ▼

The present invention provides a bag comprising two generally parallel sheets forming the main walls of the bag, complementary closure strips fixed to respective ones of said sheets in the vicinity of the mouth of the bag, and a cursor having two side flanges interconnected by a web, the flanges bei

The present invention provides a bag comprising two generally parallel sheets forming the main walls of the bag, complementary closure strips fixed to respective ones of said sheets in the vicinity of the mouth of the bag, and a cursor having two side flanges interconnected by a web, the flanges being placed on the outsides of the sheets at the mouth of the bag and co-operating with a central elongate tongue to define two converging passages for the complementary closure strips, wherein the tongue is interrupted so as to be set back from the longitudinal end of the cursor, in particular at the wider end of the cursor corresponding to the diverging ends of the passages, and wherein side flanges are provided in the vicinity of their free edges remote from the web with urging means for urging the sheets of the bag towards each other, said means occupying the entire longitudinal extent of the tongue and extending longitudinally beyond each end thereof so as to ensure that the bag is leakproof when it is in its closed position.

대표청구항 ▼

[ What is claimed is:] [1.]1. A bag having a mouth and comprising two generally parallel sheets forming the main walls of the bag, complementary closure strips fixed to respective ones of said sheets in a vicinity of the mouth of the bag, and a cursor having two side flanges interconnected by a web,

[ What is claimed is:] [1.]1. A bag having a mouth and comprising two generally parallel sheets forming the main walls of the bag, complementary closure strips fixed to respective ones of said sheets in a vicinity of the mouth of the bag, and a cursor having two side flanges interconnected by a web, the flanges being placed on outer surfaces of the sheets at the mouth of the bag and cooperating with a central elongate tongue to define two passages for the complementary closure strips, said passages having diverging ends and converging ends, wherein the tongue is interrupted so as to be set back from a longitudinal end of the cursor at a broader end of the tongue corresponding to the diverging ends of the passages, wherein said flanges are provided in a vicinity of their free edges remote from the web with urging means for urging the sheets of the bag towards each other, said urging means occupying an entire longitudinal extent of the tongue and extending longitudinally beyond each end thereof so as to ensure that the bag is leakproof when it is closed, said bag further comprising, parallel to the closure strips, between said sheets and at the mouth of the bag, additional leakproofing means provided in relief on said sheets, said additional leakproofing means forming a barrier between the sheets when the bag is closed, said cursor urging said additional leakproofing means towards a leakproofing position when the cursor is moved towards a bag-closure position, and wherein portions of the sheets situated facing the closure strips and the additional leakproofing means have a local thickness greater than a thickness of a remainder of the sheets constituting the bag.