Abstract: The invention relates to a U-shaped clamping piece for attachment to a panel provided with an opening, having two flat legs, connected by a yoke, with a nut part axially movably disposed between the two legs for receiving a bolt, said bolt penetrating the opening and one leg, wherein said nut part is non-rotatably held on the clamping piece by a lateral arm. The nut part is secured by its end in axially resilient manner to the leg facing away from the panel by means of a plurality of straps extending from the end of the nut part to the leg.

Abstract: The invention relates to a rotationally symmetrical plastic nut part, insertable into a penetration in a metal plate, for a fastener, more particularly a screw, adapted to be received by a hole in the nut part, with a flange, said flange being adapted to be brought into contact with the metal plate. A coaxial metal ring is embedded in the flange, a front side of said metal ring being adapted to be brought into contact with the surface of the metal plate, wherein, upon rotation of the nut part together with the metal ring, the metal ring is adapted to be joined by friction-welding to the metal plate.

Abstract: The invention relates to a fastening element with a friction-welding surface for friction-welding to a flat component through rotational force acting on the fastening element and pressing force against the component. The friction-welding surface is bordered by a circular coaxial friction-soldering surface, the friction-welding surface projecting axially in relation to the friction-soldering surface by a length essentially containing only the material required for friction-welding.

Abstract: In a process for the production of a screw comprising a low-alloy carbon steel, having a head, an adjoining holding portion and a functional tip which, in the outer region of limited radial depth, is of a greater hardness than the holding portion, in which the screw body is shaped by pressing and rolling and then the functional tip is subjected to a hardening operation, hardening is effected by momentary heating with a high level of energy transfer and subsequent quenching and is limited to portions of the periphery of the functional tip.

Abstract: A supporting sleeve configured for introduction into a penetration in a component. The hole of the supporting sleeve is penetrated by a fixing pin that is insertable into a carrier so as to fix the component on a carrier. The supporting sleeve includes a closed ring-shaped cross section and a plurality of axially and inwardly extending recesses extending over the entire length of the supporting sleeve and each of the recesses is formed by inwardly bent walls and a base connecting those walls, the walls being generally radially oriented and configured such that when radial pressure is applied to the supporting sleeve upon introduction into the penetration, each recess moves closer to each other.

Abstract: The invention relates to a female part for a therein insertable fastener, more especially a screw, said female part aligning with a hole in a panel, with a radial extension adapted to contact the panel. The female part is provided with a drive receiving means and the extension is provided, on its carrying surface facing the panel, with a ring, surrounding the female part, of a hot-melt adhesive, said hot-melt adhesive being adapted to be melted on through rotational friction.

Abstract: The invention relates to a self-tapping screw, whose threads, in a rear area (facing the head), have a substantially cylindrical external diameter and, in a front area (facing away from the head), extend with an external diameter which decreases towards the end of the screw. Both in the rear area and in the front area, the threads have an asymmetrical cross section with a bisector of the flank angle, measured at the thread tips, which is located obliquly with respect to the axial course of the core and which reverses from the rear area (first cross section) towards the front area (second cross section), the bisector in the front area being inclined towards the screw head. The reversal point of the thread cross section is placed such that the first cross section is substantially present in the rear area, the second cross section substantially in the front area.

Abstract: The invention relates to a plastic nut to be fitted to a component having an aperture, which, with a nut piece serving to hold a screw, can be plugged into the aperture and which, in order to bear on one side of the component, is provided with a flange which has a through hole for the screw and, on its side facing the component, has a sealing washer and, in order to bear on the other side of the component, is provided with snap-action hooks which, after insertion, spread out as the screw is tightened in the accommodation hole in the plastic nut and therefore secure the plastic nut to the component. The sealing washer has at its outer rim a shoulder which encloses the flange and projects beyond the thickness of the latter and, from its inner rim, merges into a collar which projects into the through hole.

Abstract: The invention relates to a plastic nut for mounting on a component having a penetration, said plastic nut being insertable into the penetration with a nut piece having a receiving hole for a screw and being provided with a flange for contact with one side of the component and with snap-on hooks for contact with the other side of the component, said snap-on hooks securing the plastic nut to the component, wherein, when in the relaxed position, said snap-on hooks on the one hand conform in their radial extent to the internal dimension of the penetration and on the other hand cover the receiving hole and spread apart when the screw is inserted and position themselves opposite the component.

Abstract: Supporting sleeve, said supporting sleeve being introducible into a penetration in a component, wherein, for the fixing of the component on a carrier, the hole of said supporting sleeve is penetrated by a fixing pin, particularly a screw, insertable into the carrier. The supporting sleeve is formed in cross section as a closed ring and comprises a plurality of axially extending recesses extending over the entire length of the supporting sleeve, wherein, when radial pressure is applied to the supporting sleeve, the walls of said recesses come closer to each other as the bases of the recesses bend in.

Abstract: The invention relates to a device for securing a structural element provided with a hole to a panel-like component, said panel-like component being fitted with a stay-bolt onto which can be pressed on the side opposite the component a hollow cylindrical part with a flange, said hollow cylindrical part being able to be received by the hole and having a latching portion, the flange having a diameter greater than the diameter of the hole. A metal part, forming the latching portion and having a plurality of latching lugs, is inserted into the hollow cylindrical part, wherein the hollow cylindrical part has a spring portion which yields to axial pressure and the structural element is provided on its side facing the component with an inwardly directed collar on which rests the hollow cylindrical part with its end opposite the flange when the hollow cylindrical part is in the secured position with the spring portion pressed in.

Abstract: In a process for the production of a screw comprising a low-alloy carbon steel, having a head, an adjoining holding portion and a functional tip which, in the outer region of limited radial depth, is of a greater hardness than the holding portion, in which the screw body is shaped by pressing and rolling and then the functional tip is subjected to a hardening operation, hardening is effected by momentary heating with a high level of energy transfer and subsequent quenching and is limited to portions of the periphery of the functional tip.

Abstract: The invention relates to a plastic nut for mounting on a component having a penetration, said plastic nut being insertable into the penetration with a nut piece having a receiving hole for a screw and being provided with a flange for contact with one side of the component and with snap-on hooks for contact with the other side of the component, said snap-on hooks securing the plastic nut to the component, wherein, when in the relaxed position, said snap-on hooks on the one hand conform in their radial extent to the internal dimension of the penetration and on the other hand cover the receiving hole and spread apart when the screw is inserted and position themselves opposite the component.

Abstract: The invention relates to a clamping piece of springy sheet metal with two opposing, V-shaped latching recesses and a spring bottom connecting the latching recesses, said spring bottom having in its middle a hole for receiving a screw for securing a component to a panel, wherein, for latching into a penetration in the panel, the latching recesses are of such depth that, with the clamping piece in the latched position, their arms encompass the edges of the penetration on both sides in such a manner that the spring bottom maintains a distance from the panel. Provided between spring bottom and component is a supporting part, wherein, when pressure is exerted on the spring bottom, said supporting part holds the spring bottom at a minimum distance from the component through supporting of the supporting part on the component.

Abstract: The invention relates to a self-tapping screw, whose threads, in a rear area (facing the head), have a substantially cylindrical external diameter and, in a front area (facing away from the head), extend with an external diameter which decreases towards the end of the screw. Both in the rear area and in the front area, the threads have an asymmetrical cross section with a bisector of the flank angle, measured at the thread tips, which is located obliquly with respect to the axial course of the core and which reverses from the rear area (first cross section) towards the front area (second cross section), the bisector in the front area being inclined towards the screw head. The reversal point of the thread cross section is placed such that the first cross section is substantially present in the rear area, the second cross section substantially in the front area.

Abstract: The invention relates to a plastic nut to be fitted to a component having an aperture, which, with a nut piece serving to hold a screw, can be plugged into the aperture and which, in order to bear on one side of the component, is provided with a flange which has a through hole for the screw and, on its side facing the component, has a sealing washer and, in order to bear on the other side of the component, is provided with snap-action hooks which, after insertion, spread out as the screw is tightened in the accommodation hole in the plastic nut and therefore secure the plastic nut to the component. The sealing washer has at its outer rim a shoulder which encloses the flange and projects beyond the thickness of the latter and, from its inner rim, merges into a collar which projects into the through hole.

Abstract: The invention relates to a securing device for a structural component to be secured to a panel with a tubular piece inserted into a penetration in the panel, into which tubular piece is inserted a screw, said screw being supported with its head on the one end of the tubular piece and holding the structural component with its threaded part, said structural component contacting the other end of the tubular piece, said tubular piece being screwed an optional distance into the penetration for axial adjustment. The tubular piece contains a distance detector, wherein, when the tubular piece is at a distance from the structural component, said distance detector is in its starting position projecting out of said tubular piece on its side facing away from the screw head and, when the tubular piece is in contact with the structural component, said distance detector is noticeably displaced out of the tubular piece.

Abstract: Screw provided with self-locking rolled thread, wherein, in a plurality of places along its extent, said thread is deformed in relation to the normal thread cross section in that the thread outside diameter is reduced by radial compression of limited thread portions, the area of the thread cross section being substantially identical to that of the undeformed thread. While maintaining the slant of the thread flanks, the thread cross section is symmetrically widened in the outer region and reduced in the adjoining inner region, the transition from the widened to the reduced thread cross section lying approximately in the centre of the respective thread flank, and the limited thread portion extends over two parts of a thread turn such that there result two symmetrically opposite thread portions each of approximately ⅙ of the thread turn.