| 摘要 |
The molded object made of thermoplastic material comprises an external surface for forming base plane (P o) from which a hook of a component is projected with the object, an outer surface on which first and second lateral surfaces extend, and an intermediate surface separating the inner and outer surfaces and forming an edge of the hook. The molded object and the hook are formed by injection molding. The hook comprises a base part and a head part or hanging part making projection from the base. The hook is bounded by the first and second lateral surfaces. The molded object made of thermoplastic material comprises an external surface for forming base plane (P o) from which a hook of a component is projected with the object, an outer surface on which first and second lateral surfaces extend, and an intermediate surface separating the inner and outer surfaces and forming an edge of the hook. The molded object and the hook are formed by injection molding. The hook comprises a base part and a head part or hanging part making projection from the base. The hook is bounded by the first and second lateral surfaces. Curve sections are defined by the intersections of the first and/or second lateral surfaces with the planes that are parallel to the base plane and that are at given distances (h) from the base plane, and have respective curvatures that vary according to the distance. The curvature of the curved section for h=0 is greater than the curvature of a curve section for a distance h that corresponds to the head of the hook. The curved sections of first and second lateral surfaces have bends with opposite concavity. The transition part of the head between one of the lateral surfaces and the intermediate surface is incurved and smooth without any corner or sharp edge. The intermediate surface is significantly perpendicular to both first and second lateral surfaces. The head of hook has a first cross-section with a rounded corner according to a first radius of curvature, and a second cross-section with a rounded corner according to a second radius of curvature. The second section is more close to the distal end of the head, and the second radius is greater than the first radius. The distance between the first and second lateral surfaces of the cross section in a plane parallel to the base plane decreases from the base of the hook to the head. The cross section has a protrusion that is transverse with two lateral surfaces and the intermediate surface and is smaller than the cross section of the hook head that makes projection from the distal end of the hook. The hook has a quadrilateral shape with four corners in a cross-section such as a square, rectangle, or diamond. The transition between the protrusion and head of the hook forms a shoulder or corner. An independent claim is included for an insertion block. |
