Patent ID: 9717309
Date: 2017-08-01
CPC Classifications: A44B,A61F,Y10T

Claim:
1. A hook fastener, adapted to be attached to a counterpart comprising retaining filaments by a cooperation of its hooks with said filaments, including: a base strip, and a field of hooks comprising gripping hooks protruding from said strip, each said gripping hook comprising a stem which extends in its main direction and is topped by a cap, said cap including at least one overhang extending laterally from said stem, and each said gripping hook being further delimited, at least at its cap portion, in its transverse direction, by two opposing substantially planar surfaces, wherein the overhang comprises a swelling located at a distance from the stem so that a thickness of the overhang increases in said swelling from an intermediate region of the overhang located between said swelling and said stem in a direction towards a distal end of the overhang, a bottom surface of the overhang forming a cavity for receiving the filaments of the counterpart in a vicinity of said intermediate region, a cavity width measured in a lateral direction of the gripping hook, between a low point of the bottom surface of the overhang and a facing part of the gripping hook, is equal to at least 2 times a predetermined distance, wherein the predetermined distance is an average largest cross-sectional dimension of the retaining filaments, a cavity depth measured in the main direction of the gripping hook, between the low point of the bottom surface of the overhang and a high point of the bottom surface of the overhang, is equal to or greater than 0.4 times the predetermined distance and is less than 2 times the predetermined distance, and a minimum thickness of the overhang, measured from a reference point of an upper surface thereof, is equal to or less than 2 times the predetermined distance, and wherein the predetermined distance is comprised between 5 and 150 microns.