Composite fastener

A fastener comprising a first click element and a second click element, the first click element comprises a coupling surface of the first click element and the second click element comprises a coupling surface of the second click element, wherein the coupling surface of the first click element comprises a plurality of coupling pins that are flexible and the coupling surface of the second click element comprises a plurality of recesses, the plurality of recesses dimensioned for clampingly receiving the plurality of coupling pins,

• wherein the plurality of coupling pins comprise a base portion and a top portion, the top portion having a conical, pyramidal, truncated conical or truncated pyramidal shape, narrowing towards an apex of the top portion, and wherein the top portion comprises at least two separate lips that are overhanging, which extend radially relative to the base portion, wherein the lips comprise a bottom surface that is perpendicular to a longitudinal axis of one of the plurality of coupling pins and/or slants downwards to the coupling surface of the first click element as it extends radially,
• wherein the plurality of recesses comprise a through-hole, and wherein the through-hole comprises at least two ribs, extending inwardly from a perimeter of the through-hole,
• wherein the through-hole having an opening reduced by the ribs to restrict unobstructed passage of the top portion and only allowing passage of the top portion under a predetermined minimal force or pressure exerted on the coupling surface of the first click element and the coupling surface of the second click element towards each other,
• wherein the opening is dimensioned to allow unobstructed passage of at least a superior segment of the base portion when projections of the lips and the ribs along the longitudinal axis of the pins are at least partly overlapping, and
• wherein the through-hole is essentially rectangular with two oppositely positioned long sides and two oppositely positioned short sides, with the lips positioned at the long sides, and with an inner flank tooth or a flank bump at the short sides, wherein the ribs are positioned on opposite sides of the pins and dimensioned such that the pins are wider at the ribs than a distance between the lips in the through-hole, and wherein the pins comprise one or more lateral teeth or lateral bumps on flanks of the pins that connect the sides with the ribs, said lateral teeth or said lateral bumps being configured for being suspended on the inner flank tooth or the flank bump of the plurality of recesses, and wherein the lateral teeth or the lateral bumps are dimensioned such that the pins are more narrow at the lateral teeth or the lateral bumps than the distance between the inner flank teeth of the plurality of recesses, thereby allowing movement of the pins in the plurality of recesses along the long side of the plurality of recesses.

A fastener comprising a first click element, a second click element, and a third click element, the first click element, the second click element, and the third click element comprising coupling surfaces, wherein the coupling surfaces of the first click element and the third click element comprise a plurality of coupling pins that are flexible and the coupling surface of the second click element comprises a plurality of recesses, the plurality of recesses dimensioned for clampingly receiving the coupling pins,

• wherein the plurality of coupling pins comprise a base portion and a top portion, the top portion having a conical, pyramidal, truncated conical or truncated pyramidal shape, narrowing towards an apex of the top portion, and wherein the top portion comprises at least two separate lips that are overhanging which extend radially with respect to the base portion, wherein the lips comprise a bottom surface that is perpendicular to a longitudinal axis of the pin and/or slants downwards to the coupling surface of the first click element as it extends radially,
• wherein the coupling pins of the first click element are grouped in pairs of two or more aligned coupling pins, wherein neighboring coupling pins of the pair of two or more coupling pins are distanced such that the distance between the top portions thereof is larger than a width of the base portion of the coupling pins of the third click element, and smaller than a width of the top portion of the coupling pins of the third click element,
• wherein the plurality of recesses comprise a through-hole, and wherein the through-hole comprises at least two ribs that extend inwardly from a perimeter of the through-hole,
• wherein the through-hole has an opening reduced by the ribs to restrict unobstructed passage of the pairs of coupling pins and only allowing passage of the top portion of said pairs of coupling pins under a predetermined minimal force or pressure exerted on the first and second coupling surfaces towards each other,
• wherein the opening is dimensioned to allow unobstructed passage of at least a superior segment of the base portion of the pairs of coupling pins when projections of the lips and the ribs along the longitudinal axis of the pins are at least partly overlapping,
• wherein inwardly facing lips of the pairs of the coupling pins are dimensioned to restrict unobstructed passage of the coupling pin of the third click element and only allowing passage of the top portion of said coupling pins of the third click element under a predetermined minimal force or pressure exerted on the first and second and third coupling surfaces towards each other, and
• wherein the first and third click element each comprise a connecting section configured to connect the first and third click element, such that the coupling surfaces of the first and third click element are distanced over a distance essentially equal to a thickness of the coupling surface of the second click element, wherein the pin comprises a flank which is provided with a tooth, and wherein the recess comprises an inner wall which is provided with an inner flank tooth, and wherein the tooth and the inner flank tooth are configured to lock in a tooth connection when flank surfaces are pushed together after the pin is inserted into the recess.