| 摘要 |
In a hook structure for a molded surface fastener, each of hooks (10) is composed of a rising portion (11), which has a rear surface (11a) rising obliquely in a smooth curve from the substrate (14), a front surface (11b) rising upwardly from the substrate (14), and side surfaces from at least one of which a reinforcing rib (13) extends, and a hook-shape engaging portion (12) extending forwardly from an upper end of the rising portion (11). The engaging portion (12) has a varying cross-sectional area increasing progressively from its distal end toward the upper end of the rising portion (11). A straight line between a peak of the rib (13) and a peak (O1) of an arcuate lower surface of the engaging portion (12) is substantially parallel to the upper surface of the substrate. The rib (13) is rising upwardly and substantially centrally from a side surface of base of each hook (10). A straight line passing a center point (O2) in height of the rib (13) and parallel to the surface of the substrate (14) crosses a ridge of the rib (13) and a ridge of the rising portion (11) of each hook (10) in such a manner that the ratio of a line segment of the straight line between the crossing points with the ridge of the rib (13) to a line segment of the straight line between crossing points with the ridge of the rising portion (11) is 1/5 to 1/2. <IMAGE> |
