Patent ID: 9631661
Date: 2017-04-25
CPC Classifications: E04B,F16B

Claim:
1. An expansion anchor for fixing in a wall, comprising: a screw including a head and a shank including a thread; an anchor body configured to receive the shank of the screw, the anchor body comprising: the nut-forming portion configured to advance in a direction of the flange, by deforming the expansion portion from an initial state for insertion in a wall to a deployed state, under action of screwing the screw in the nut-forming portion, wherein the expansion portion comprises a tubular membrane made of polymer material, including an internal bore to receive the shank of the screw, each of inner and outer peripheral surfaces of the membrane including a plurality of circumferentially distributed and radially open longitudinal grooves that increase a circumferential surface area of the membrane; and wherein, in a configuration that the anchor is mounted inside a hole in a wall, with the flange bearing against a first face of the wall and the expansion portion projecting from a second face of the wall, the expansion portion in the deployed state forms a continuous contact surface facing the second face of the wall and includes a load-bearing section, transversely with respect to the axis of the screw, which is generally decreasing from the contact surface towards the nut-forming portion.