Abstract: Screw connection for a fixed connection of two assemblies which are mounted to each other in a variable position, using a connecting member penetrated by a screw. The connecting member is mounted between the assemblies by means of a self-cutting screw penetrating the connecting member and one of the assemblies, which screw is grooving its thread into both parts in such a way that, starting from a stable end position of the one assembly and the connecting member, the screw is adapted to be screwed into the connecting member as well as into the one assembly by means of thread grooves such that, by means of the self-cutting thread of the screw, the connecting member and the one assembly are held in a fixed position with respect to each other, and the other assembly is fastened directly to the connecting member.

Abstract: Screw connection for a fixed connection of two assemblies which are mounted to each other in a variable position, using a connecting member penetrated by a screw. The connecting member is mounted between the assemblies by means of a self-cutting screw penetrating the connecting member and one of the assemblies, which screw is grooving its thread into both parts in such a way that, starting from a stable end position of the one assembly and the connecting member, the screw is adapted to be screwed into the connecting member as well as into the one assembly by means of thread grooves such that, by means of the self-cutting thread of the screw, the connecting member and the one assembly are held in a fixed position with respect to each other, and the other assembly is fastened directly to the connecting member.

Abstract: The invention relates to a self-tapping drill screw that is screwable into a sheet piece and comprises a slotted head for accommodating a tool, a threaded shank, a slightly conically tapering hole-forming part and a hole-grinding part having a conical piece. The hole-grinding part has a radial shoulder that forms a hole and coaxially surrounds the conical piece, engagable with the sheet piece, in a ring-like manner, has a much larger diameter than the conical piece and merges with the hole-forming part via a rounded annular edge.

Abstract: Connecting nut for screwing structural elements onto a panel-like component (5, 58), said connecting nut comprising a retaining element (2, 3; 56) in abutment with a nut part (1, 62) for attachment to the component. This is a two-part design with nut part (1, 62) and securing part (4, 53), said nut part (1, 62) and securing part (4, 53) enclosing the component (5, 58) between them, said securing part (4, 53) penetrating a through-hole (13, 14; 28, 29; 31; 32; 57) in the component (5, 58) with a snap-action hook (7, 8; 26, 27; 54) and being connectable to the nut part (1, 62). A receiving bore (11, 12; 59) in the retaining element (2, 3; 56) receives the snap-action hook (7, 8; 26, 27; 54), said snap-action hook (7, 8; 26, 27; 54) latching into the retaining element (2, 3; 56).

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: 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 an end surface spaced from the free end of the screw to guide the plastic displaced by the thread during threading of the screw.

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 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: 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 plastic nut for inserting into a through-hole in a panel-like component, the plastic nut comprising retaining parts, of which one is designed as a flange which can be pressed onto the component from the fitting side and another is designed as snap-action hooks which can be pressed on from the opposite side and are intended for latching in behind the component, the retaining parts being provided with a nut part which has a receiving bore for a screw, the flange being a constituent part of a flange part which encloses the nut part, and it being possible for the nut part to be pressed in the direction of the flange, in which case the nut part, which can be moved axially with respect to the flange part, is pressed in the direction of the flange part by an elastic supporting arrangement which forms a spring zone, it being the case that, once the plastic nut has been inserted, the spring zone brings the nut part and the flange part into abutment against the component, different thicknesse

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.

Abstract: The invention relates to a drill with a drilling shank, particularly with a screw shank comprising a self-tapping thread, and with a fork-shaped hard-material plate-shaped drilling tip disposed opposite the driving end of the shank, said drilling tip being inserted into a holder in the shank, said holder comprising two grooves, disposed diametrically with respect to each other in the shank, for accommodating prongs of the drilling tip. The shank terminates bluntly in an essentially radial end surface from which the grooves extend towards the driving end in such a manner that exclusively the prongs of the drilling tip, pressed axially into the grooves, both hold the drilling tip self-lockingly on the shank and also transmit the torque from the shank to the drilling tip.

Abstract: The loading apparatus for a platen press with at least one press stage used in making particleboard, especially chipboard and/or fiberboard, from a mat comprises a loading frame which has at least one loading stage and a belt tray insertable into the panel press in the loading stage and removable therefrom. The belt tray comprises a drive drum shaft with a drive drum mounted rigidly thereon, a delivery lip and a belt guided endlessly over the drive drum and the delivery lip. The conveyor when the belt tray returns from the press for delivery of the mat is driven by a rack fixed to the frame and an associated pinion on the drive drum shaft. The pinion is mounted losely on the drive drum shaft and is nonrotatably connected with one half of a clutch whose other half is nonrotatably connected with the drive drum shaft.

Abstract: An arrangement for the automatic critical focusing of optical systems in mirror reflex cameras provided with a partially transmitting reflex mirror, an image field lens arranged in the viewfinder ray path as well as a range-finder image plane, which is equivalent to the film plane. The range-finder image plane, which contains image-forming and deflecting optical components, is arranged in the optical axis of the viewfinder system. By these means a reduction of the expenditure of optical components as well as of the required assembly and adjustment expenditure for automatic critical focusing devices is achieved.