Panel system and components

Claim 1

A fastener for securing a panel to a hollow structural element having a slot and an outer surface and an inner surface, said panel having a channel extending around at least part of the periphery thereof, said channel having an outer limit, said fastener having a unitary structure and comprising a body means securable within said channel for engaging said panel, a hook-shaped member means and two projection means projecting from said body means beyond said channel outer limit when said body means is secured within said channel, said projection means being in spaced apart longitudinal alignment on opposite sides of said hook-shaped member means, said hook-shaped member means including a cam-shaped surface means facing said channel and spaced apart from said channel outer limit when said body means is secured within said channel, said cam-shaped surface having a shape defining with said channel outer limit a passage with a wide mouth and a decreasing width rearwardly of said mouth whereby said cam-shaped surface engages said inner surface of said structural element, during relative longitudinal fastening movement between the fastener and the panel on the one hand and the structural element on the other hand after insertion of said hook-shaped member means into said slot, to pull said fastener body and said panel towards said structural element, and each said projection means being longitudinally spaced from said cam-shaped surface so as to be pulled against said outer surface of the structural element during said relative longitudinal fastening movement to provide resistance to relative movement between the panel and the structural element.