Fastener for fastening a panel to a support and assembly to fasten to said support, provided with a fastener and a panel

A fastener for fixing a panel to a support, comprising a clip foot configured to be pressed axially through a hole in said support, and a head comprising a plate to which said clip foot is linked, a wedge and a shank connecting said plate to said wedge, said wedge comprising a back-plate formed by a rigid hub, a rim and a plurality of flexible arms each connecting said rim to said back-plate, said wedge being configured to be inserted in a recess arranged in a thickness of said panel, and said shank being configured to be received in a keyhole slot in said panel opening into said recess;

• said fastener being characterized in that each said flexible arm comprises a first curved section, a second curved section and an elbow connecting said first curved section to said second curved section, said first curved section being connected to said back-plate by a first end of said flexible arm and said second curved section being connected to said rim by a second end of said flexible arm opposite the first end thereof;
• said back-plate and each said flexible arm being configured such that the distance between the center of said back-plate and said second curved section increases along said second curved section from said elbow to said rim,
• wherein at least one of:
• (i) said back-plate and each said flexible arm are also configured such that the distance between the center of said back-plate and said first curved section diminishes along said first curved section from said back-plate to said elbow when said flexible arm is in a rest configuration in which it is not deformed;
• (ii) said first section of each said flexible arm has a first length, and said second section of each said flexible arm has a second length at least 1.5 times greater than said first length;
• (iii) the first curved sections curve inward towards the back-plate for at least substantially all of their lengths;
• (iv) the first curved sections curve inward towards the back-plate along the distance from the back-plate to the respective elbows;
• (v) respective locations of the first curved sections where the first curved sections meet the respective elbows is closer to the back-plate than the respective locations of the first curved sections furthest away from the respective elbows;
• (vi) each of the flexible arms are such that the arms reverse a direction of extension by around 180 degrees between the first section and the second section;
• or
• (vii) said back-plate comprises a plurality of rigid branches protruding radially from an outer face of said back-plate, with each said flexible arm which is connected by its first end to a said respective rigid branch and each said rigid branch has a first thickness and each said flexible arm has a second thickness smaller than said first thickness.