Fastener for form panels

A fastening device to fasten at least two edge-to-edge contiguous panel facings each of which has two opposite longitudinal sides, two opposite transverse sides and a back face, comprising

• a plurality of looped members projecting from said back face of each of the panel facings along said longitudinal sides, said looped members of one of said panel facings being respectively aligned with said looped members of an adjacent said panel facing, each of said looped members having an engagement face spaced parallely from said back face and two opposed flanks extending from two sides of said engagement face and being connected to said back face, the distance between said flanks being greater than that between said engagement face and said back face, and key members each having an insert rod portion to be inserted in at least two aligned said looped members and a handle rod portion which forms an angle with said insert rod portion, said insert rod portion having a pair of first opposed longitudinal faces, and a pair of second opposed longitudinal faces, the distance between said first opposed faces being smaller than the distance between said engagement face and said back face so that said insert rod portion can be inserted into aligned said looped members, the distance between said second opposed faces being greater than the distance between said first opposed faces, said second opposed faces being engaged respectively with said engagement face and said back face when said insert rod portion is turned a certain angle after being inserted.