| 摘要 |
A synthetic-resin coupling element has a plurality of annular links which are longitudinally interconnected by webs of reduced cross-sectional area so that the element can flex at these webs. Each link is square in outline with the diagonals all lying on the longitudinal axis of the fastener and each link carries a laterally and diagonally projecting coupling head. The top side of each element is formed with a longitudinally extending notch in which the stitches of the attachment tread lie. The underside of each element is provided with pointed claw-like projections which engage the fabric to which the element is to be fastened and can even serve as welding spots for bonding of the element to the textile base. Such coupling elements can be sewn directly to the fabric with conventional sewing machines. |
