Abstract: A belt retractor for a vehicular occupant restraint system has a load-bearing frame and a stud for securing the belt retractor to a vehicle. The stud has a free end facing away from the frame, this free end being provided with a connecting projection. The connecting projection is provided with a guide pin for a nut adapted to be screwed on the stud.

Abstract: A self-tapping screw consists of a head and a threaded shank which is provided with a blade, a first threaded portion contiguous to the blade, and a second threaded portion contiguous to the head and greater in length, tooth pitch and tooth depth than the first threaded portion. The self-tapping screw is fastened onto a corrugated board such that the blade and the first threaded portion are securely embedded in a girder, and that the second threaded portion is securely embedded in an insulation layer located between the corrugated board and the girder.

Abstract: An anchor rod for use as a composite anchor is secured in a receiving borehole by one of a hardenable or curable organic and inorganic mortar mass. The anchor rod has a means (3) at a trailing end region (2) for engaging a load. The anchor rod has an anchoring region (4) insertable into the receiving borehole and has a thread-like profiling (5) for interaction with the mortar mass injected into the receiving borehole. The thread-like profiling is a coarse screw thread (5) and has a thread pitch (s) which reduces in the axial direction from the leading end toward the trailing end of the anchor rod (1).

Abstract: In a screw securing device for a screw (1) by means of which a first component (2a) and a second component (2b) are clamped together, a bushing (5a, 5b), includes a cylinder (5a) and a base (5b) which contains a bore, the bushing being arranged in a first bore (3a) of the first component (2a). The first bore (3a) opens into a smaller, second bore (3b) of the first component (2a), and said second bore (3b) is provided with a left-handed thread (8) in which there is screwed a tubular extension (5c) which is arranged coaxially with the bore in the base (5b). The screw (1) is screwed, through the bushing (5a, 5b) and the tubular extension (5c), into the second component (2b) by means of its right-handed thread (7). A cap (6a), having an insert (6b) which is connected to the screw head in a positively locking manner, is fastened on the bushing (5a, 5b) by a welding bead (4).

Abstract: A bone plate for stabilizing the anterior column of the spine has a lower curved surface and an upper surface having two intersecting planes in each of which is a screw hole, the axes of the holes being skewed relative to one another. A bone screw used to secure the plate, has a single start buttress thread near the tip and a two start machine thread near the head, the threads being continuous and of constant pitch.

Abstract: The screw of this invention can be used for fastening members of a variety of materials and reliably prevent loosening of the screw. The screw shank is formed with two threads, a main thread for driving the screw and a sub-thread which extends in the same direction as the main thread, is smaller in outer diameter than the main thread and has a pitch different from the main thread. The inclination of the slant surface of the sub-thread is set steep on the loosening side and moderate on the fastening side. The pitch of the main thread is set larger than that of the sub-thread. When the tightened screw is applied a loosening torque, the sub-thread bites into the inner wall of the hole, preventing the screw from being loosened.

Abstract: The invention relates to a headed screw for fixing an intramedullary nail in position. An external thread on the screw shank is provided over all, or a part of spaced parts, of the length of the shank. The screw head is provided with an external thread having a direction of helical advance which is opposite the direction of helical advance of the screw-shank thread.

Abstract: A screw has an elongated shank and a head. The shank has two threaded portions and at least one unthreaded portion extending therebetween. A plurality of axially spaced grooves formed by the removal of material from the unthreaded portion of the shank are provided therein to enable the screw to withstand transverse forces acting on the head when the screw is screwed in.

Abstract: The fastener, which is especially adapted for bones, consists of a shaft (2) bearing a thread (1) with variable pitch, a front end (3) and a rear end (4).The thread (1) is present over the entire area of the shaft (2), and in the area of the rear end (4) is characterized by a smaller pitch than in the area of the front end (3).Thanks to the diminishing pitch of the thread (1) in the proximal direction, a locally differentiated intraosseous pressure generation takes place. In accord with the well-known Wolff's Law, this leads to a controlled bone growth along the loading axis and thus an improvement in the stability of the implanted fastener.

Abstract: The invention relates to a screw for fixing an intramedullary nail in position. An external thread on the screw shank is provided over only a part of the length of the shank. The screw head is provided with an external thread having a direction of helical advance which is opposite the direction of helical advance of the screw-shank thread.

Abstract: A fastener has multiple secondary threads intertwined with a primary thread installable in a thermoplastic workpiece. A method and die are arranged for fabricating such a fastener. The fastener comprises a threaded shank portion having a primary thread of a desired form and a driver head attached thereto. At least one secondary thread is intertwined with the primary thread. In accordance with one embodiment of the invention, an outer surface of the fastener may be heated to a preselected Curie temperature during the installation of the fastener into a workpiece. The preselected Curie temperature enhances the flow of the thermoplastic material around the fastener while the fastener is being installed in the workpiece. A coating material having a particular desired Curie temperature may be applied to the fastener to produce desired driving characteristics.

Abstract: A screw with an unthreaded spaced away radial flange portion on its shank may be tightened and released within a bore without falling from the bore once released. The assembly of the screw and a strain relief bushing permits the conventional strain relief bushing to optionally hold and release cable without risking the loss of the retaining screw from the bushing.

Abstract: A tapping screw having a shank having a head and a tapered tip portion. The shank is formed on its peripheral surface with threads. First and second drill edges are formed on the tapered portion and on the intermediate portion between the head and an tapered portion, respectively, so as to be independent of the threads. The first drill edge has a maximum diameter smaller than that of the threads in the rear thereof and the second one has a maximum diameter equal to or larger than that of the threads on the main portion of the shank.

Abstract: A fastener/plate assembly for fastening material to a roof deck employs a threaded fastener having a shank with two thread sections. The distal end portion of the shank has a thread which is loosely insertable through an opening of the plate. A second thread of the shank has a thread diameter greater than the first section and is threadably engageable with the plate. The driver end of the fastener is dimensioned so that during an overdrive condition, the fastener may threadably disengage from the plate to allow the driver end to pass through the stress plate opening.

Abstract: A screw unit with a shaft (1) and an enlargement at one end, to join together semi-rigid mats, consisting for example of mineral fibers or foam material, has the shaft (1) consisting of a wire helix (W) wound in corkscrew fashion and continuing at the one end as a spiral winding forming the headpiece (2), with the helical slope (.alpha.) of the wire helix (W) adjacent the headpiece (2) being smaller than the helical slope (.beta.) in the region of a point (5) at the other end of the shaft (1).

Abstract: A screw threaded fastener particularly intended for use in fastening corrugated sheet material to metal purlins comprises a drilling point (1), a head (2), a first self-tapping screw threaded portion (3) adjacent the drilling point (1), a second screw threaded portion (4) adjacent the head (2), the second screw threaded portion (4) having a larger crest diameter than the first screw threaded portion (3), and an unthreaded portion (5) extending between the first and second screw threaded portions. The diameter of the part of the fastener carrying the second screw threaded portion (4) is generally larger than that carrying the first screw threaded portion (3) and the fastener also includes a transition portion (6) between its portions of smaller and larger diameter and in particular, interposed between the trailing edge portion of the first screw threaded portion (3) and the leading edge portion of the unthreaded portion (5).

Abstract: A screw including a head and a shaft having a helically threaded portion and a barbed portion is provided. In operating the barbed portion driven into a hole by pressure on the head in the axial direction. When the barbed portion is completely driven into the hole, the threaded portion comes into contact with the wall of the hole for driving the screw slightly further into the hole in this manner tight engagement between the two members fastened by the screw can be achieved. The barbed portion is so formed as to prevent removal of the screw.

Abstract: A rock-bolt bar having raised deformation its entire length and having an end portion threaded to receive a standard helically threaded nut. The raised deformations are all raised to the same height above a minor diameter of the bar and the depths of the threaded portions of the raised portions do not extend to the minor diameter. The equal height raised portions may be of various configurations, all extending longitudinally the entire length of the bar.

Abstract: A self-penetrating screw for penetrating sheet metal and then bolting a panel or other member to the penetrated sheet. The screw is hardened and has a penetrating point, a bolt-like shank and a head. The bolt-like shank is provided with machine screw threads and the tapered penetrating point has space threads with a pitch substantially greater, and preferably twice, the pitch of the machine screw thread.

Abstract: A tapping screw having a tapered edge at a rear part of the tapered portion at its tip. The drill edge has the maximum diameter which is larger than the maximum thread diameter at the tapered portion and smaller than the maximum thread diameter at the shank. The drill edge allows the screw to be driven in more securely with a smaller driving force. The drill edge also has a greater lead angle than the lead angles of the threads on the tapered portion and on the shank rearwardly of the drill edge.

Abstract: A fastener and a joint including the fastener, wherein the material in which the fastener is set is a composite. The fastener has a shank with an external helical rib that makes a slightly tighter than net to a moderate interference fit in a cylindrical wall of the hole. The rib has a form whose maximum radial protrusion is flat or convex, and which extends away from its maximum protrusion as a convex curve, devoid of sharp cutting edges. Voids between the convolutions of the rib are adequate to receive displaced material of the hole wall.

Abstract: A connecting element for two machinery components or constructional components is provided with a threaded portion 4 used for fastening and an anti-fatigue portion 3 arranged axially displaced to the threaded portion 4 and consisting of several elevations 5 and grooves6, with the minor diameter d.sub.3R of the grooves 6 of the anti-fatigue portion 3 being made smaller than the minor diameter d.sub.3 of the threaded portion 4. The proportion is between 80 and 100%. The pitch diameter d.sub.2R of the anit-fatigue portion 3 consisting of the elevations 5 and the grooves 6 are larger than or the same as the pitch diameter d.sub.2 of the threaded portion 4.

Abstract: A dial indicator is supported by a device which relies on a differential screw to enable the feeler of the dial indicator to be precisely adjusted in very fine increments. In one embodiment, the differential screw extends between the two legs of a U-shaped element, the dial indicator being carried by one of the legs and being adjusted when the screw is turned to pivot the legs toward or away from one another. In another embodiment, the screw extends between two end-to-end links and is operable when turned to effect relative pivoting of the links.

Abstract: A fastener for attaching sheet metal or articles to sheet metal. The fastener is a self-locking sheet metal screw having a plurality of equally spaced teeth formed within a recess beneath the fastener head during the heading operation. The teeth preferably have curved trailing edges and straight or slightly inclined leading edges, and each extends laterally a different distance from the shank, as well as vertically a different distance along the shank, such lateral and vertical distances on a single tooth being equal.

Abstract: A fastener for use in securing wallboard such as drywall to a supporting structure includes a shank having a bugle head at one end and a tapered point at an opposite end, an annular ring flange and anti-clockwise threads disposed on the shank adjacent the head portion to auger and recompact particulate material which exhausts from the tapping threads during insertion of the fastener, and to tuck the outer sheeting layer evenly beneath the bugle head of the fastener.

Abstract: A connector, for example for connecting a tubular member such as a pipe, comprises a male member which has an external frusto-conical surface provided with a thread and a female member having an internal frusto-conical surface provided with a thread for engagement with the thread of the male member. The members are provided with sealing surfaces which are brought into sealing abutment under an axially directed compressive force when the members are fully engaged together, as a result of which one member, as shown in FIG. 3 the male member, is partly compressed and the other member, as shown in FIG. 3 the female member, is partly tensioned.

Abstract: A carton separating apparatus for separating a carton from a stack of cartons comprising a rotatable body; a drive shaft connected to said rotatable body; a plate mounted axially adjacent said rotatable body; a separating blade removably attached to said plate and having a side surface facing said rotatable body and defining an axial gap therebetween adapted to receive a portion of a carton; a single screw device supporting and connecting said plate to said rotatable body and including a first threaded portion of one pitch connected to said rotatable body and a second threaded portion of another pitch connected to said plate whereby rotation of said single screw device causes differential relative axial displacement of said rotatable body and said plate while maintaining a parallel relationship between opposite gap defining surfaces thereof; and a detent device to biasingly hold said screw device in selected incremental adjusted positions.

Abstract: A connector, for example for connecting a tubular member such as a pipe, comprises a male member which has an external frusto-conical surface provided with a thread and a female member having an internal frusto-conical surface provided with a thread for engagement with the thread of the male member. The members are provided with sealing surfaces which are brought into sealing abutment under an axially directed compressive force when the members are fully engaged together, as a result of which one member is partly compressed and the other tensioned. To improve the load distribution along the threads of the members, the pitch of the thread is varied along the axial length of the threaded surfaces. Specifically the surfaces are divided into three portions, an intermediate portion in which the pitches of the threads of the members are the same, and end portions at either end of the intermediate portion, in which the pitches of the threads differ.

Abstract: The shank of a self tapping screw has a thread forming section, a threaded section, and a reduced diameter section interconnecting the forming and threaded sections. The thread forming section forms internal threads into a known thread form that has a wedge ramp at its root. The threaded section comprises threads of standard form having the same pitch as the thread forming section. The reduced diameter section is slightly longer than an integer multiple of the pitch so that the threaded section is backset slightly from the forming section.