Importance

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Abstract

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

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First Claim