Patent ID: 8443493

Claim:
A fastening device for attaching a structural member to a support member, said device comprising: a lower portion having a shank portion attachable to the support member, an upper portion having a radial flange at an outer side and an axial passage passing through the upper portion on an inner side, at least one outer side of the shank portion having an axially parallel extending row of saw-tooth-shaped teeth, and a resilient pawl being formed at the axial passage for cooperating with the row of teeth in a ratchet manner, when the upper portion is pushed onto the shank portion in a first direction, to block a relative displacement of the upper and lower portions in a second, opposite direction, wherein the axial passage of the upper portion is configured to receive the shank portion from a first end of the shank portion, the upper portion is removable through a second end of the shank portion opposite to the first end in the first direction, and the shank portion has a through hole passing through the lower portion from the first end of the shank portion to the second end of the shank portion.