Abstract: A nail-shaped fastening element having a stem, and a head (3, 13, 23, 33) provided at one end of the stem and projecting radially beyond the stem with the stem tapering at its another, free end toward a tip (5, 15, 25, 35) and having a spherical, first section (1, 11, 21, 31) extending from the tip (5, 15, 25, 35) in a direction toward the head (3, 13, 23, 33), and a second conical section (2, 12, 22, 32) adjoining the first section (1, 11, 21, 31) and having a length (L2, L12, L22, L32) smaller than a length (L1, L11, L21, L31) of the first section (1, 11, 21, 31).

Abstract: A fastening element which is designed for driving-in a constructional component, includes a stem (11) adjoined, at it's opposite sides, by a load application section (13) and a tip (12) facing in the setting direction of the fastening element, and a prestress member (20) having a force-introducing section (21) engaging the stem (11) and/or the tip (12), and a bearing surface (22) remote from the load application section (13) and provided with an elastic layer (17) having an opening (18) a wall (19) of which is radially spaced from an axial projection of the stem (11).

Abstract: A fastening element which is designed for driving—in a constructional component, includes a stem (11) adjoined, at it's opposite sides, by a load application section (13) and a tip (12) facing in the setting direction of the fastening element, and a prestress member (20) having a force-introducing section (21) engaging the stem (11) and/or the tip (12), and a bearing surface (22) remote from the load application section (13) and provided with an elastic layer (17) having an opening (18) a wall (19) of which is radially spaced from an axial projection of the stem (11).

Abstract: A nail-shaped fastening element having a stem, and a head (3, 13, 23, 33) provided at one end of the stem and projecting radially beyond the stem with the stem tapering at its another, free end toward a tip (5, 15, 25, 35) and having a spherical, first section (1, 11, 21, 31) extending from the tip (5, 15, 25, 35) in a direction toward the head (3, 13, 23, 33), and a second conical section (2, 12, 22, 32) adjoining the first section (1, 11, 21, 31) and having a length (L2, L12, L22, L32) smaller than a length (L1, L11, L21, L31) of the first section (1, 11, 21, 31).

Abstract: A hollow drilling tool is made up of an axially extending tubular carrier part, a cutting body at one end of the carrier part, and guide elements located in the axial direction of the carrier part between the cutting body and the carrier part. The radially outer surface of each guide element is in alignment in the axial direction of the carrier part with the radially outer surface of the cutting body. The guide elements guide the hollow drilling tool in a borehole formed by the cutting body.

Abstract: In an explosive charge-driven fastening element setting gun having a casing and a muzzle tube axially displaceably mounted in the casing, a damping housing is arranged to receive explosive gases passing laterally out of the gun. The damping housing surrounds the gun and is formed of two parts, one fitting into the other in a telescoping manner. One part is attached to the muzzle tube and the other part is fixed to the casing. Packing is secured to one of the parts and extends into contact with the other part in the region where the parts are telescopically fitted together.