Patent attributes
A coil zipper structure for elongating the life time of the conventional zipper that includes a first coil and a second coil, wherein the first coil and the second coil are respectively formed by linking plural engaging rings, and each engaging ring has a teeth portion for mutual engagement; and a sliding element, mounted between the first coil and the second coil for separating or engaging the engaging rings, wherein the engaging ring has an upper edge portion and a lower edge portion, in which the lower edge portion is fixed on a base cloth and the upper edge portion has a strengthened flat surface. Since the upper edge portion of the engaging ring is the strengthened flat surface, the collision or pulling and dragging between the sliding element and the upper edge portion can be reduced, so as to elongating the life time of the zipper.
