Patent ID: 7337509
Filing Date: 2008-03-04
Classification: A44B,Y10T

Abstract:
1. A slide fastener having a pair of right and left fastener stringers in which a large number of fastener elements are attached at a predetermined pitch in a length direction of fastener tapes, wherein each fastener element comprises: an element main body having a base portion attached to each fastener tape, a neck portion projecting from the base portion, and an engaging head portion projecting from the neck portion and expanding in the length direction of the fastener tape so as to engage a mating engaging head portion; and stiffening means which is provided on the element main body, allowing the fastener stringers to bend when the fastener elements are separated and the stiffening means stiffening and blocking the fastener chain from bending when the fastener elements are engaged, the stiffening means comprises: a first firm contact plane which makes firm contact with mating stiffening means when the fastener elements are engaged; one or more rectangular swollen portions swollen respectively from the neck portion to the engaging head portion on first and second surfaces of the element main body; the first firm contact plane is a side face extending in a fastener tape traversing direction and/or in a tape length direction of each rectangular swollen portion; and a concave portion, to which a part of the engaging head portion of the mating fastener element is fitted, is formed between the rectangular swollen portions swollen on the first and second surfaces.