Fastening element for securing insulating strips and/or insulating boards to a solid base structure

Claim 1

Fastening element for securing insulating strips and boards to a solid base, comprising a large surface area washer, a fastener, a tubular extension for a passage and guidance of said fastener engaged in the solid base, said fastener (5) having at least one wave-shaped bulge (9) at one end region thereof, said fastener being capable of being driven into a prepared hole in the solid base, another end region of the fastener (5) projecting into the tubular extension (4) and being provided with a thread (13), and a nut (14) attachable to said another end region (12) of the fastener (5), said another end region being insertable into an interior (11) of the tubular extension (4), said tubular extension being connected to said washer so as to secure said tubular extension against rotation, said tubular extension and said nut being formed so that said nut is held secure against rotation in said tubular extension and so as to permit a telescopic movement of said fastener relative to said tubular extension.