Abstract: Expanding wall anchor, comprising (i) a threaded longitudinal body formed as a single piece with an expansion cone at one of its ends, this cone being connected to the rest of the body by a cylindrical portion of diameter d1 smaller than the nominal diameter D of the body, and (ii) an expanding sleeve of thickness e mounted around the said cylindrical portion of the body and through which the expansion cone is intended to be moved in order to deform the sleeve and anchor the wall anchor in a hole in a support material, characterized in that the ratio d1/D is greater than or equal to 60% and the ratio e/d1 is greater than or equal to 22%.

Abstract: Expanding wall anchor, comprising (i) a threaded longitudinal body formed as a single piece with an expansion cone at one of its ends, this cone being connected to the rest of the body by a cylindrical portion of diameter d1 smaller than the nominal diameter D of the body, and (ii) an expanding sleeve of thickness e mounted around the said cylindrical portion of the body and through which the expansion cone is intended to be moved in order to deform the sleeve and anchor the wall anchor in a hole in a support material, characterized in that the ratio d1/D is greater than or equal to 60% and the ratio e/d1 is greater than or equal to 22%.

Abstract: A self-expanding and self-undercutting guard rail bolt includes a dowel having a guard rail fastening end and a ring. The fastening end is configured to be driven in rotation, and the ring is configured to rigidly connect to a first screwing end of the dowel by an incipient fracture portion. The self-expanding and self-undercutting guard rail bolt further includes a counter-dowel screwed to the dowel by a second screwing end. The counter-dowel includes an expansion cone, and an anti-rotation head having at least one edge which projects beyond a periphery of the dowel to prevent rotation of the counter-dowel about an axis of the guard rail bolt.

Abstract: A self-expanding and self-undercutting guard rail bolt includes a dowel having a guard rail fastening end and a ring. The fastening end is configured to be driven in rotation, and the ring is configured to rigidly connect to a first screwing end of the dowel by an incipient fracture portion. The self-expanding and self-undercutting guard rail bolt further includes a counter-dowel screwed to the dowel by a second screwing end. The counter-dowel includes an expansion cone, and an anti-rotation head having at least one edge which projects beyond a periphery of the dowel to prevent rotation of the counter-dowel about an axis of the guard rail bolt.

Abstract: The suspension plate is divided into a plurality of adjacent functional portions (2, 13, 24), including a fixing portion (2), the said portions each being separated from another by a bending zone (10, 15) to be folded back in pairs one towards the other. One of the bending zones (10) is weakened by at least one notch (11, 12) for reception of a flexible strand (25). The invention is applied, in particular, to the suspension of false ceilings.

Abstract: The invention relates to a method of fastening a guard rail (60) to a concrete slab (100) by means of a self-expanding and self-undercutting bolt (1, 1?, 1?) comprising a dowel (10) having expanding lugs (17) and an expansion core (20, 23), the method comprising a phase consisting in drilling a hole (103?, 103?) in the slab, a phase consisting in driving the bolt in to a desired depth (E1+E2) independent of the depth of the hole, a dynamic tightening phase (h) resulting in the formation of the undercut and a static tightening phase of the guard rail. The guard rail bolt comprises the dowel (10) and a counter-dowel (20). The dowel (10) comprises at its fastening end (11) a guard rail fastening head (13) rigidly connected at its screwing end (12) by means of incipient fracture means (15) to a ring (16) provided with expansion lugs (17).

Abstract: The suspension plate is divided into a plurality of adjacent functional portions (2, 13, 24), including a fixing portion (2), the said portions each being separated from another by a bending zone (10, 15) to be folded back in pairs one towards the other. One of the bending zones (10) is weakened by at least one notch (11, 12) for reception of a flexible strand (25). The invention is applied, in particular, to the suspension of false ceilings.

Abstract: A pole has, at one end, a tool-securing device, a linkage for operating the tool, a sleeve for operating the tool which is designed to slide along the pole, and an arrangement for securing the operating sleeve to the linkage which runs inside a tubular element. The operating sleeve comprises a securing wedge that lies through a window formed in the tubular element and through which the linkage runs.

Abstract: The plug comprises a tubular hollow body (3) surmounted by a bearing collar (2) with

Abstract: An expanding sleeve of an anchor is arranged around a threaded shank engaged in a plug for expanding the sleeve. The sleeve includes an axially compressible portion which includes portions that can be sheared and which are arranged so that after they have been sheared they allow the sleeve to be shortened axially. The sleeve consists of a cut-out sheet-metal blank rolled up on itself.

Abstract: The expanding sleeve (2) of the anchor is arranged around a threaded shank (9) engaged in a plug (3) for expanding the sleeve (2). The sleeve (2) comprises an axially compressible portion (16) which comprises means (24) that can be sheared and which are arranged so that after they have been sheared they allow the sleeve (2) to be shortened axially. The sleeve (2) consists of a cut-out sheet-metal blank rolled up on itself.