Abstract: A dowel construction for anchoring an element in a borehole, comprises, a tubular dowel of a plastic material which is insertable into the borehole and advantageously has means thereon for preventing turning movement thereof relative to the borehole. The tubular dowel has a window opening for accommodating a straddling member which is disposed in the opening between a securing bolt insertable in the dowel and the borehole. The straddling member and the bolt are constructed so that there is a wedge-engagement surface between them which causes radial outward movement of the straddling member into engagement with the borehole when the bolt is moved in a withdrawal direction. Preferably, at least two metal straddle bodies are uniformly arranged over the circumference of the bolt and they preferably have cylindrical outer surfaces which are disposed in the window cutouts of the tubular plastic cage forming the tubular dowel.

Abstract: A metal expansion anchor sleeve is made by forming an elongated flat sheet metal blank so that it has a longitudinal slot extending inwardly from one of its ends and dividing it into two sections which are connected at the other end and which are each provided with a projecting tongue located in the region of the one end. Each tongue is thereupon bent back onto the respective blank section so that its free end moves through more than 180.degree., the bending being over a radius equal to at least half the thickness of the blank. The blank is then arcuately bent transversely to the elongation of the slot and formed into an externally substantially cylindrical expansion anchor sleeve having an inner longitudinal passage which, due to the presence of the tongues, diverges in direction away from the one end, i.e., converges towards the one end which is the leading end of the sleeve.