Abstract: Device for fixing a pencil or the like on a security hat of the type comprising a sheath disposed at the base of the hat, constituting a cavity which extends from top to bottom and is open at both ends thereof. The device comprises a generally flat member which is formed of a slight curvature enabling it to rest against the surface of the security hat. A hook is formed from the member enabling to introduce and hold a pencil or an object of the same type. The flat member comprises a tongue intended to be introduced in the cavity by snapping thereby preventing the exit of the tongue once the latter is in position in the cavity.

Abstract: This T-assembly of the tenon and mortise type for two perpendicular metal tubes comprises a mortise formed in one tube and having an omega shape in cross section, through the local distortion of the tube wall, by depressing said wall towards its opposite lateral wall, without breaking the continuity of the tube surface, the tenon being obtained on the other hand by simply crushing to a slightly dovetail configuration the end of the other tube, the tenon comprising at least one collar-shaped external protrusion adapted notably to engage the outer portion of the mortise.