Abstract: One aspect of the present invention provides an injection molded mushroom type hook structure. The injection molded mushroom type hook structure of the present invention includes a stem portion and a substantially planar head portion formed at a top end of the stem portion, wherein the head portion includes two protrusion portions extending outwardly at two opposite sides of the head portion in a first direction, at least one extended portions extending outwardly from one side of the head portion in a second direction substantially perpendicular to the protrusions, and four connection portions that are formed at locations where the lateral sides of the two protrusion portions meet adjacent extended portion and the head portion. These structural features allow the injection molded mushroom type hook structure of the present invention to have a substantially same hook-to-loop engagement rate in each direction and an improved hook-to-loop engagement/peeling-off strength.

Abstract: One aspect of the present invention provides an injection molded mushroom type hook structure. The injection molded mushroom type hook structure of the present invention includes a stem portion and a substantially planar head portion formed at a top end of the stem portion, wherein the head portion includes two protrusion portions extending outwardly at two opposite sides of the head portion in a first direction, at least one extended portions extending outwardly from one side of the head portion in a second direction substantially perpendicular to the protrusions, and four connection portions that are formed at locations where the lateral sides of the two protrusion portions meet adjacent extended portion and the head portion. These structural features allow the injection molded mushroom type hook structure of the present invention to have a substantially same hook-to-loop engagement rate in each direction and an improved hook-to-loop engagement/peeling-off strength.

Abstract: A hook, in a mechanical fastener, includes a hook body having a base, at least one hook arm and a hook body side-curved portion corresponding to the at least one hook arm, the at least one hook arm including a hook end and a neck portion between the hook body and the hook end, the neck portion having an inner curved portion opposing to the hook body side-curved portion. The hook body side-curved portion is defined by a portion of a circumference of a first circle, the inner curved portion of the neck portion is defined by a portion of a circumference of a second circle and the hook end is defined by a portion of a circumference of a third circle.

Abstract: The present invention provides a novel hook and an injection molded hook strap of a mechanical fastener including the hook. The hook of the present invention can effectively mitigate/eliminate the stress concentration and plastic deformation problem of the injection molded hook and the destruction problem of the injection molded hooks and loops by redesigning the mutual structural relationship between the curvature of the hook body and the neck portion of the curved hook arm and the hook end, so as to provide the functionalities of prolonging the effective lifetime of the hooks and the loops, extending the engaging duration between the hooks and the loops, and enhancing the engagement strength between the hooks and the loops.