Abstract: A self-tapping screw includes a head, a shaft, a tapered end and a rounded distal tip. A thread includes a thread start on the tapered end. The axial position of the thread start and a first full thread, the radius of the round distal tip and the diameter of the tapered end at the thread start are controlled in relation to the screw size for consistent, improved screw performance.

Abstract: The present invention provides a male screw part comprising a head and a shank portion extended from the head and formed with screw threads, and being adapted to be screwed into a mating female screw part, wherein the screw threads disposed in the vicinity of a tip end of the shank portion in a direction of screwing are formed with at least one notch in a heightwise direction thereof, the notch having edges intersecting with a ridgeline of the screw threads, and wherein a root diameter of the notch is larger than an inner diameter of the female screw part.

Abstract: A thread cutting screw to be screwed into a predrilled hole in concrete, masonry, or the like is characterized in that the relationship between the load bearing thread surface AOn of the loaded thread flank, which surface is standardized to the load bearing thread length he and cut into the wall of the predrilled hole, and the nominal diameter db of the predrilled hole is as follows AOn=k {square root over (db)} wherein k is a constant of which the value is 1<k≦2.5.

Abstract: A bolt according to the invention comprises: a coarse screw thread portion of pitch P, which is formed from the tip end portion of a bolt shank to a prescribed portion; and a fine screw thread portion of pitch p (p=P/n wherein n is an integer of 2 or more), which is formed so as to overlap the coarse screw thread portion for at least the entire length of the coarse screw thread portion of the bolt shank or from the tip end portion to the prescribed portion of the coarse screw thread portion. And, it is an object of the invention to provide a bolt that can be mass-produced at low cost, bring about excellent synchronicity, strength against compression and shear, and an excellent tightening force, and in which a nut screwed therein is scarcely loosened upon receiving a large vibration load.

Abstract: According to the principles of the invention, a fraud detection system receives data relating to telecommunications activity. Event generators generate events from the received data, with each event having a weight corresponding to an increased or decreased likelihood of fraud. The aggregated events for a subject (a subscriber or an account) determine a score for the subject, which is used to prioritize the subject in an investigation queue. Human analysts are assigned to open investigations on the investigation queue according to the priority of subjects. In this manner, investigation resources can be applied more effectively to high-risk subscribers and events.

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: A gutter fastener (10) having a first shank portion (14) with a head (12a) integrally formed on one end and a second shank portion (16) integrally formed with the opposite end. The first shank portion has a length (L1) substantially equal to the water collecting opening in a gutter (20), while the second shank portion has a length (L2) substantially equal to one half the length of the first shank portion. The second shank portion includes screw-like threads (50) for engaging the facial panel (24) behind a gutter arid enabling a more secure connection between the two.

Abstract: A progressive (variable) pitch, interlocking thread with a tooth cross-section that is wider at its crest than at its root which creates radial clamping action when tightened into a tapped hole that has a similar thread cross-section.

Abstract: A screw shaft including a shaft base member having a hollow part at a shaft cantor part and an outer periphery part formed with a screw part. The hollow part is formed protruded to an inner side corresponding to recessed portions of the screw part.

Abstract: A thread forming screws including opposite flanks connecting the screw crest region with the screw root region and tapering outwardly toward the root region, with each flank being formed of outer and inner flank sections tapering toward the root sections at different angles, and with the crest region being formed of a first region section (8) extending parallel to a central axis of the screw and a second, inclination region section (7) inclined toward the root region (5) in a direction opposite a setting direction (S) at an angle of from about 10° to about 45°.

Abstract: An irrigation valve comprises a valve housing made from a valve body joined to a valve bonnet by a plurality of attachment screws. The valve body and valve bonnet have an alignment rib received in an alignment notch when the body and bonnet are joined together such that the holes that receive the attachment screws are automatically aligned with one another. The attachment screws have a smooth portion adjacent a threaded portion such that the smooth portion when visible signals to the user that the attachment screws are clear of the valve body but are still captured in the valve bonnet. The valve includes a solenoid that may be remotely actuated to open the valve. An L-shaped actuator arm is also operatively connected to the solenoid for manually opening the valve with the upper portion of the actuator arm being closer to the user than in previous valves and thus easier to grip and turn.

Abstract: A screw (1), in particular a concrete screw, for being screwed into a drilled hole (20) comprises a core (2) with a pilot end (3), a lengthwise screw-in direction (5) and a central longitudinal axis (4); and a thread (7), which is designed in a single piece with the core (2) and which comprises a cutting thread (9), the cutting thread (9) extending from the pilot end (3) counter to the lengthwise screw-in direction (5) and having flanks (12, 13), which are substantially parallel to each other, and cutting notches (17), which are open radially outwards; and a standard thread (11), which adjoins the cutting thread (9), with the standard thread (11) substantially having a triangular cross-sectional shape.

Abstract: An ice screw device for winter, alpine and ice climbing includes a banger couplable to a tubular shank with a screw thread. The tubular shank includes an ice engaging portion configured to be inserted into ice, a tip, and a head portion. The ice engaging portion includes a length and a reverse taper. A majority of the reverse taper of the ice engaging portion is located proximate the tip and within less than half of the length of the ice engaging portion from the tip. In addition, the taper of the ice engaging portion is non-linear. The ice engaging portion of the tubular shank can have at least two sections.. A first section nearer the tip has a first taper different from a second taper of a second section nearer the head portion.

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: Apparatus and method for forming a pin and nut fastener assembly for temporarily or permanently securing two panels having conventional drilled generally aligned holes into which the assembly is inserted. Weight of the pin and nut is reduced while retaining predetermined industry established strength requirements. The thread section of the pin is reduced along with the mating thread of the nut. The pin may be cold-worked in critical areas.

Abstract: A threaded fastener includes a lead having bosses separated from one another by bases along the thread crest. The lead-in and lead-out profiles of the bosses, and other features of the bosses and bases may differ from one another along the fastener shank. The lead-in and lead out profiles may have linear and non-linear surfaces. The lead-in and lead-out profiles may have cutting edges angled toward the direction of propagation of the bosses. The boss profiles may be selected to reduce insertion torque and to provide excellent resistance to pullout. The fastener may be formed by roll threading via a tool made by a plunge EDM process.

Abstract: A threaded fastener includes a lead having bosses separated from one another by bases along the thread crest. Two such leads may be formed such that lead-in profiles for of one lead are disposed at locations corresponding to locations of lead-out profiles for the other lead. The lead-in and lead-out profiles of the bossed, and other features of the bosses and bases may differ from one another along the fastener shank. The boss profiles may be selected to reduce insertion torque and to provide excellent resistance to pullout. The fastener may be formed by roll threading via a tool made by a plunge EDM process.

Abstract: A tool joint comprising a male member a female member. The male member having a coupling portion rearwardly from a body portion. The coupling portion having a frustoconical forward portion and a threaded rear portion. The thread having an intermediate section of uniform depth and terminating in forward and rear end parts. The female member having a bore extending rearwardly from a front surface. The bore having a frustoconical forward portion and a threaded rear portion. The thread having an intermediate section of uniform depth and terminating in forward and rear end parts. Upon threaded coupling of the male and female members to form a tool joint connection, the threaded portion of the male member engages the threaded portion of the female member.

Abstract: A screw includes a cylindrical shank having an upper portion formed with spiral circular threads and a lower portion formed with spiral triangular threads, each of the spiral triangular threads having three budges having three sharp edges and three pointed tips, the pointed tips of the spiral triangular threads being located at different positions, the cylindrical shank having a pointed end at a lower portion thereof, whereby the screw can be easily and rapidly turned into a piece of hard wood.

Abstract: An improved screw structure to be used exclusively for the wood plate mainly comprises of a smooth shank on the upper end portion of the screw body, the round thread teeth on the intermediate section and the helical thread teeth in tetragonal shapes on the lower end portion, wherein the pointed portions of the tetragonal thread teeth are arranged at different angles for cutting the wooden materials being drilled; furthermore, since the tetragonal shapes of the thread teeth reduce the frictional force occurred during the screwing process, the operation becomes more labor saving, works fast and prevents the wooden materials from being cracked.

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: An oil-country-tubular threaded joint can withstand tensile forces, and in addition, other forces such as compression and bending forces, thus producing highly improved characteristics in regard to the prevention of fluid leakage. The oil-country-tubular threaded joint is formed of male screw threads and female screw threads which have a load face whose load flank angles are in a range of −3° to −25°, in which the load flank angles are varied at a position at which the load face is divided in the height direction of the male screw thread into an upper side and a lower side so that an upper load flank angle is smaller than a lower load flank angle by 0.5° to 2.0°. Also, a thread-machining apparatus for the oil-country-tubular threaded joint uses chasers having cutting edges which are shaped so as to correspond to thread shapes for machining screw threads whose flank angles are partly of negative values for the oil-country-tubular threaded joint.

Abstract: A self-tapping screw comprised of a shank (1) whose end on the setting side is tapered and a thread (2) with a cylindrical external contour. A pilot thread (3) is connected to the end of the thread (2) on the setting side; the pilot thread having a thread pitch width that diminishes in the setting direction (S) for providing better insertion behavior. The screw further comprises a trailer thread (4) with a diminishing thread pitch width (b3) for improving the loosening behavior.

Abstract: An insert for thread repair having an interior thread and a specially formed exterior thread which both precludes upheaval between sides of the cracked material on opposite sides of the crack and draws the crack together, radially inward towards the center of the insert. The insert may include a driving head, either solid or having a central hollow and may include a frangible neck to dissociate the head from the insert.

Abstract: A hole-shaping and thread-forming screw (1) has a non-cutting hole-shaping end section (2) that ends in a point, a haft section (4) provided with a thread (3) and an engagement section (5). The non-cutting hole-shaping end section (2) tapers towards its end. The whole screw is made of a stainless material, in particular its end section (2). When the screw (1) is driven in, a hole is haped without cutting into the workpiece (7) and is then threaded by the screw (1) itself.

Abstract: The present invention relates to a novel screw for use with dry wall and for hanging articles therefrom. This invention provides a screw with a head adapted for engagement with a driving tool, a shank whose diameter decreases from the head to a distal end, and a helical thread with a pitch diameter of at least about twice the largest minimum diameter of the shank. The thread including a geometry of an auger.

Abstract: A connection bolt (1) for repeated tightening beyond yield point which bolt (1) comprises a head (2) and a shank which shank is provided with a thread, whereby said head (2) of said connection bolt (1) is provided with at least one indication mark (9) at a fixed defined mutual angle position to at least one indication sign (10), which sign (10) is provided on the free shank (5) end relative to the axis (q—q) of the bolt (1) rotation. This system of marking allows to determine the damage of said bolt (1) exactly and to decide about further ability of said bolt (1) to be used next time without any risk of destruction or decrease in quality of a joint.

Abstract: The invention involves a differential and/or conical screw of a variable increasing pitch which is used for the initial mechanical stimulation of a healthy bone, in order to induce a new internal strain and the consequential biological reaction of the bone. The biological reaction results in the formation of a new, young superficial bone, and the process takes between 4 and 8 weeks. The new bone is used as an autologous bone transplant. The transplantation of this new bone into other parts of the body, where such a procedure is indicated, is a new method referred to as adaptive periosteal cambiplasty. The process of the implantation of the screws into the bone is controlled with the use of a special moment key, which provides for the induction of a defined and desired stimulation force, and it also provides for the safety of the method.

Abstract: A threaded fastener having a shaft with a screw thread disposed thereabout, a pressure flank of the screw thread having a first pressure flank angle on a radial inner portion thereof and a second pressure flank angle on a radial outer portion thereof, the first pressure flank angle less than the second pressure flank angle. The fastener is preferably embodied as a screw fastener with a relatively small gimlet angle.

Abstract: An object is to provide a high strength screw in which a high strength steel material not used in the prior art is employed as the tapping screw or gib-head screw or bolt or the like, and moreover, which, by the administering of a carburization hardening process on the surface thereof, has high tensile stress and shear stress, and has high surface hardness, and which has, particularly in tapping screws, good male thread formability with respect to the foundation hole of the opposing member, and very good tightening and joining properties and durability. Another object of the present invention is to provide compatibility with a machine screw in such a way that, once the tapping screw has been removed from the opposing member, a machine screw can be screwed into the male thread formed by the tapping screw.

Abstract: A screw with a thin head comprising a screw head (2) and a shank (4), and with its top (5) forming a circular arc of a large radius has an unthreaded part (20) tapered down between the bearing surface (6) and the thread (3) and has a radius (21) connected to the thread portion (3), and therefore it will be readily produced to be used for compact products and correspond with thin products. And the radius (21) is connected to the unthreaded part (20) of the shank on one hand and to the screw ridge (3) on the other, preventing stress concentration at this part from occurring at time of fastening and a long time after the fastening of the screw, so ensuring a fastening strength, without causing a fatigue fracture. And further, when heating and plating treatments have been given to the screw, as the top of the screw head is not flat, there is no possibility of the heads of the screws being stacked to each other in the course of mass production, ensuring stable heat and plating treatments.

Abstract: A fastener includes a head and a threaded shank. The shank defines an inner periphery and the thread defines an outer periphery. The shank and the thread each have a generally polygonal crossection with at least five lobes separated by at least five convex surfaces.

Abstract: Apparatus and method for forming a pin and nut fastener assembly for temporarily or permanently securing two panels having conventional drilled generally aligned holes into which the assembly is inserted. Weight of the pin and nut is reduced while retaining predetermined industry established strength requirements. The thread section of the pin is reduced along with the mating thread of the nut. The pin may be cold-worked in critical areas.

Abstract: Apparatus and method for forming a pin and nut fastener assembly for temporarily or permanently securing two panels having conventional drilled generally aligned holes into which the assembly is inserted. Weight of the pin and nut is reduced while retaining predetermined industry established strength requirements. The thread section of the pin is reduced along with the mating thread of the nut. The pin may be cold-worked in critical areas.

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: An improved anchor device or fastening member which is particularly suited for use in the attachment of various fixtures and equipment to masonry, concrete, and other hard and/or friable substrates includes a head and a shank depending therefrom. The shank has a first threaded portion having a predetermined thread angle and a predetermined hardness, and a second threaded portion having a predetermined thread angle and a predetermined hardness. The first threaded portion is proximate to the head and the second threaded portion extends from the first threaded portion. The thread angle of the first threaded portion is different than the thread angle of the second threaded portion. In addition, the hardness of the first threaded portion is softer than the hardness of the second threaded portion. This provides for a more ductile anchorage when the fastening member is engaged with the substrate.

Abstract: A fastener system includes a screw or bolt having two interleaved helical threads which bracket a helicoil. The helicoil expands and torques by various means to maintain hold and purchase between the screw coil combination and the substrate into which the screw and helicoil are inserted even when the substrate recedes a significant distance from the screw and helicoil combination. The two interleaved threads hold the coil and prevent it from rolling over the threads in high load applications.

Abstract: A fastening assembly for fastening a first member to a second member comprising at least one threaded fastener having a head at one end thereof, the head having engagement surfaces for a tool, a threaded shank, the other end of the shank having engagement surfaces for a tool, at least one receiving bore in the first member into which the threaded shank is threaded in a pre-mounted state from one end thereof, with the head being spaced from the associated surface of the first member, the second member being preferably of thin sheet material and having at least one elongated opening, the opening having a first portion adapted to allow the entrance of head and a smaller portion adapted to accommodate the shank while the head grips behind the edge of the opening.

Abstract: Apparatus and method for forming a pin and nut fastener assembly for temporarily or permanently securing two panels having conventional drilled generally aligned holes into which the assembly is inserted. Weight of the pin and nut is reduced while retaining predetermined industry established strength requirements. The thread section of the pin is reduced along with the mating thread of the nut. The pin may be cold-worked in critical areas.

Abstract: The present invention relates to a screw comprising a screw body including a tip portion having a front face, an end portion having a rear face and being positioned to lie in spaced-apart relation to the tip portion, a threaded portion having a rounded thread extending between the tip portion and the end portion, and a passageway extending the length of the screw body from the front face to the rear face.

Abstract: A fastener (1) for connecting at least two components includes a shank (4) having an axis. At least one threaded portion (7) is arranged at the shank (4), and it has a stressed cross section. At least one elongation portion (5) is arranged at the shank (4), and it has a stressed cross section. The stressed cross section of the at least one elongation portion (5) is less than the stressed cross section of the at least one threaded portion (7). At least one fitting portion (6) is arranged at the shank (4). It has a stressed cross section, and it includes a plurality of protrusions (9) and channels (10). The at least one elongation portion (5) and the at least one fitting portion (6) are spaced apart along the axis of the shank (4). The channels (10) have a root diameter determining the stressed cross section of the at least one fitting portion (6).

Abstract: An insert for thread repair having an interior thread and a specially formed exterior thread which both precludes upheaval between sides of the cracked material on opposite sides of the crack and draws the crack together, radially inward towards the center of the insert. The insert may include a driving head, either solid or having a central hollow and may include a frangible neck to dissociate the head from the insert.

Abstract: A self-tapping fastener is provided. The fastener is formed from a blank having an odd number of lobes along a cross section taken perpendicular to its axis of rotation. The lobes define a relatively high out-of-round cross section along a tapered thread-forming zone, and a relatively low out-of-round cross section along the main body taken in a direction toward the drive head. Between the main body and tapered thread-forming zone is located an additional thread forming zone having an axial length of approximately one thread pitch and a cross section that conforms to the high out-of-round of the tapered zone. The maximum diameter (at the lobes) of the additional thread-forming section approximately matches that of the full-diameter main body section. A lower-diameter stabilizing section can be provided ahead of the tapered zone, adjacent the tip of the fastener.

Abstract: In a screw (1) for mutual fastening of two components (2 and 3) there is provided a shank (4) with a thread (6), an unthreaded shank portion (7) and a screw head (5). The end region (8) of the thread (6) adjacent to the unthreaded shank portion (7) tapers with constant thread pitch (S), and so the tapering end region (8) of the thread (6) forms a kind of frustoconical envelope surface (10) upon rotation of the screw (1). During setting of the screw (1) and during over-torquing thereof, the end region (8) of the thread (6) acts as a kind of milling cutter and makes a frustoconical opening (13) in the component (3). The thread flights in the tapering end region (8) can then be braced against the wall of this opening (13), so that mutual contact pressure between the components (2 and 3) is possible despite over-torquing of the screw (1).

Abstract: A screw comprising a shank having an upper portion formed with spiral circular threads and a lower portion formed with spiral triangular threads, each of said spiral triangular threads having three sharp edges and three pointed tips, said pointed tips of said spiral triangular threads being located at different positions, whereby the screw can be easily and rapidly turned into a piece of hard wood.

Abstract: A method and apparatus for attaching a RF/ID transponder to an object is described. The transponder is integrated within an attaching device to protect the transponder from damage, hazardous environments and tampering. Further, by integrating the transponder within the attaching device, the device can be countersunk to further protect the transponder. Further still, manufacturing the device from a non-ferrous material prevents degradation of the transponder reading range.

Abstract: A threaded fastener is having a raised area or bump on a thread flank. The flank can be positioned on the nut thread or on the bolt thread. The bump forces the mating threads at least on one flank to have near zero tolerances along the pitchline of the threads and thereby eliminating play. A threaded repair insert having at least one raised area on a threaded surface also is provided.

Abstract: A screw threaded fastener (103) has an elongate shank (122) with a drilling tip (104) at one end and a head (123) at the other end. A screw thread extends along at least a part of the length of the shank (122). The trailing flank (116) of the thread subtends an angle (B) relative to the axis (117) of the fastener which approaches 90° and is greater than the angle (C) subtended by the leading flank (115). The screw is for use in fixing sheets of material a1 to thin metal battens (5) and the angle between the trailing flank (116) and the adjacent thin metal section (18) of the batten (9), being reduced in comparison to a conventional thread form, lessens the distorting effect of the thread on the batten (9) under relatively high pull-out loads.

Abstract: A self-aligning, anti-cross threading fastener having first and/or second members with lead threads having a curved surface feature from the minor diameter to the major diameter which allows the surface of the lead threads to cam over the mating threads of the other member and thereby aligning collinearly the longitudinal axis of the two members. The initial presentation angle of the two threaded members may be restricted and therefore enhanced by providing a protruding diameter feature.

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.