CONCEALED SLIDE FASTENER

摘要

In the inventive concealed slide fasteners (1, 21, 31, 41), sewing of fastener elements (10, 10', 32, 42, 52) is carried out by a first sewing thread (8) for sewing first and second legs (11, 12, 61, 62) to a fastener tape (2) and by a second sewing thread (9) for sewing the second legs (12, 62) to the fastener tape (2) on the side closer to the meshing heads (13, 63) than the first sewing thread (8), sewing of the second legs (12, 62) is carried out by double lock sewing by the needle thread (9a) and the looper thread (9b) of the second sewing thread (9), and holding grooves (15, 15', 65) for receiving and holding the looper thread (9b) at a position closer to the fastener tape (2) than the surfaces (12a, 62a) of the second legs (12, 62) facing the first legs are formed on the surfaces (12a, 62a) facing the first legs. When the right and left element lines (3) are meshed, they are meshed stably by reducing interference of the meshing heads (13, 63) of one fastener elements (10, 10', 32, 42, 52) with a crossing portion (7) by double lock sewing of the sewing thread (9) for sewing the other fastener elements (10, 10', 32, 42, 52), and excellent concealability can be maintained even if the fastener tape (2) is subjected to a lateral pulling force under a meshed state by preventing the right and left element lines (3) from being exposed from between the elements of the U-shaped folding portion (2c) of fastener tape (2).