Abstract: Screw made of plastic for screwing into a material of low strength, e.g. rigid foam plastic, having a deep thread compared with the screw shank, the screw shank running out conically into a screw point. The screw has the following features: 1. the depth of thread H and the minor diameter Dk of the thread form a quotient Q1=H/Dk in the order of magnitude of 1 to 3.5, preferably 2; 2. the minor diameter Dk and the thread pitch P form a quotient Q2=Dk/P in the order of magnitude of 0.3 to 0.6, preferably 0.5; 3. the thread is designed as a V-thread having a vertex angle of the thread teeth of less than 30°.

Abstract: Self-tapping screw with rolled thread turns, on which the angle bisector of the thread turn formed by the load flank and the rear flank slopes away from the screw head at an angle to the perpendicular to the screw axis, the load flank running in a straight line to the thread root, and the rear flank initially extending in a straight line from the thread tip and, at about ⅓ of its height, merging via a kink into a straight angled portion at an angle that is greater than the angle, measured relative to the perpendicular, of the rear flank and is between 30° and 50°, the ratio of the thread's core diameter to the thread's outside diameter being greater than 0.7 and the ratio of the thread pitch to the thread's outside diameter being less than 0.25.

Abstract: The invention relates to a device for fastening a cathode ray tube on a covering frame, in the case of which a flat flange which is fastened on the cathode ray tube and is provided with a bore is screwed to the covering frame by a screw, via an internal thread. Arranged between the covering frame and flange is a compensating element which, in a position which is determined by the cathode ray tube butting against the covering frame, can be fixed in relation to the covering frame in that the compensating element interacts with an internal-thread-containing guide part of the covering frame.

Abstract: The invention relates to a device for fastening a cathode ray tube on a covering frame, in the case of which a flat flange which is fastened on the cathode ray tube and is provided with a bore is screwed to the covering frame by a screw, via an internal thread. Arranged between the covering frame and flange is a compensating element which, in a position which is determined by the cathode ray tube butting against the covering frame, can be fixed in relation to the covering frame in that the compensating element interacts with an internal-thread-containing guide part of the covering frame.

Abstract: Screw made of plastic for screwing into a material of low strength, e.g. rigid foam plastic, having a deep thread compared with the screw shank, the screw shank running out conically into a screw point.

Abstract: Attachment device for a component to be attached to a plate, which is three-dimensionally adjustable with respect to the plate. The attachment includes a sleeve which is inserted into an opening of the plate and locked with respect to the plate by means of rotation. A tubular piece with a through hole is screwed into the sleeve into which a screw is inserted with substantial positive allowance for radial adjustability. This screw rests with its head at one end of the tubular piece and supports with its threaded part the component which abuts to the other end of tubular piece which, for axial adjustment, is optionally far screwed in.

Abstract: Self-tapping screw having an at least partially non-round enveloping curve for the thread and having a penetrating section and a retaining section, it being the case that the penetrating section contains a plurality of successive thread stages which each have at least one thread turn and, along the thread stage, have essentially the same, aligned enveloping curve which runs either cylindrically or elliptically, the thread stages with an elliptical enveloping curve (elliptical thread stage) being combined such that the major axes of the successive elliptical thread stages, forming a stage group, are offset with respect to one another.

Abstract: The invention comprises a self-screwthread-forming screw of corrosion-resistant steel, which screw is partially precipitation-hardened. The invention also concerns a process for producing such a screw in which the screw is firstly shaped by pressing and rolling or by screwthread rolling or cutting or in other known fashion characterized in that the screw is then partially precipitation-hardened.

Abstract: The invention comprises a self-screwthread-forming screw of corrosion-resistant steel, which screw is partially precipitation-hardened. The invention also concerns a process for producing such a screw in which the screw is firstly shaped by pressing and rolling or by screwthread rolling or cutting or in other known fashion characterized in that the screw is then partially precipitation-hardened.

Abstract: The invention relates to a plastic nut having a receiving bore into which a self-tapping screw can be screwed, it being the case that the receiving bore forms a through-passage region and has an adjoining, narrower region which has a diameter which allows the self-tapping screw to be screwed in, the receiving bore forming one or more steps at its transition to its narrower region via thread-like slope.

Abstract: A cold-rolled screw which is intended for screwing into plastic has a narrow self-tapping thread with an inflection on at least one side of the thread so that the inner flank angle is smaller than the outer flank angle but still approximately equal to or larger than one third of the outer flank angle. In a second aspect, the screw thread has a end surface spaced from the free end of the screw to guide the plastic displaced by the thread during threading of the screw.

Abstract: Device for conveying and fitting components which are to be inserted in a workpiece and are guided in a rail, which serves as a magazine and, at one end, has an opening (33) for delivering a component (17). The opening merges into a receiving part for a single component, which receiving part is connected to the rail via a hinge and is aligned with this rail, and the rail, together with the receiving part, is mounted in a longitudinally displaceable manner in a guide in which the receiving part, in order to receive a component, is, in the pushed-back position of the rail, held in a receiving position in which it is aligned with the rail. The receiving part is arranged in such a way that, when the rail is pushed forward, the receiving part, together with the component, projects out of the guide and, via the hinge, pivots through approximately 90.degree.

Abstract: A retaining screw produced by cold rolling includes a self tapping thread designed to be screwed into thermoplastic material or the like. The screw has a virtually end-to-end cylindrical thread as well as thread teeth, the thread crest of which has the same height on the whole length, while the free space between two teeth remains the same all along the thread The screw presents the following characteristics: either 1) the thread outer diameter Do and the thread inner diameter Dk represent the ratio Q.sub.1 =Do/Dk, in a magnitude of 1.2 to 1.4; 2) the axial distance P between two thread teeth gives with the height H of the latter a ratio Q2=P/H, in a magnitude of 2.75 to 2.9; 3) the point angle of the thread teeth is about 30.degree.; or 1) the thread outer diameter Do and this thread inner diameter gives a ratio Q1=Do/Dk, in a magnitude of 1.25 to 1.65; 2) the axial distance P between two thread teeth gives with the height H of the latter a ratio Q2=P/H, in a magnitude of 2.35 to 2.

Abstract: The invention relates to a countersunk head screw with an even number of ribs with countersinking blades on the underside of the screw head and projecting therefrom. Every other rib has a step at its end towards the screw shaft formed by shortening the rib concerned in relation to each adjacent rib.