Abstract: A thin zipper includes two sets of coil zippers fastened to two base cloths. Each coil zipper includes a plurality of teeth and at least one core wire threading through the teeth and coupling the teeth in series. Each tooth includes a bracing section, two bent sections extended from two distal ends of the bracing section and a surface section. The bracing section has a bracing inner edge on an inner side to brace the core wire. Each bent section has a latch portion engaged with another latch portion of a different tooth. The surface section is located between the two bent sections and has a packing inner edge formed on an inner side to compress the core wire to generate deformation. The bracing inner edge and packing inner edge form an inner space between them at an interval smaller than the diameter of the core wire.

Abstract: 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.

Abstract: 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.