Abstract: An adjusting device for repositioning a movable component relative to a stationary component includes a shank having a head at one end thereof and a distal tip at an opposite end thereof. The adjusting device also includes a first thread formed on the shank, the first thread disposed in a helical pattern along the shank, and a reversing thread formed on the shank, the reversing thread disposed in a helical pattern along the axial surface of the shank, the reversing thread helical pattern is formed in a direction that is opposite to the helical pattern of the first thread. Also described herein is a linear adjustment assembly that includes an adjusting device and a retaining device. The retaining device includes a thread disposed in a helical pattern along an interior surface of the retaining device having a helical pattern that is substantially similar to the first thread helical pattern.

Abstract: The present invention provides a surface hardening portion 11 that has increased surface hardness and that is applied with a compressive residual stress, at least on the surface of a male screw 10 of a bolt 1. The present invention includes the steps of cutting to form the male screw 10 of the bolt 1, and processing to provide at least on the surface of the male screw 10 of the bolt 1 the surface hardening portion 11 that has increased hardness and that is applied with a compressive residual stress. As a result, the present invention can improve the fatigue resistance of the male screw 10 and the bolt is effective as a bolt to be used in a portion where the male screw 10 is subject to a repetitive stress.

Abstract: A chipless thread-forming screw (10) has a thread-carrying shank (11) provided at its opposite ends with a tip (13) and a head (4), respectively, and having a diameter between 0.25 and 0.35 mm, with the shank (11) having at least one frustroconical section (21) extending from the tip (13) in direction of the head (14) and having, with respect to the thread root (22), a point angle (?) between 200 and 300, and a cylindrical section (25) extending between the frustroconical section (21) and the head (14), and with a starting line (23) of the thread (15) remote from the head (14) being spaced from the tip (13) by a distance (Lt) from 0 to 0.3 mm.

Abstract: A threaded element of plastic material for a joining assembly has a uniquely formed thread profile of a small profile angle between 30° and 50° and a rounded crest of a relatively large radius of curvature. The gap between the revolutions of the thread is of a volume which exceeds that of the thread. In order to provide for a specific cutting geometry of the thread profile the threaded element comprises a plurality of angular segments which are radially offset with respect to each other such that adjacent angular segments provide cutting edges. Furthermore, a tool and a method for making such a joining assembly are disclosed.

Abstract: A thread form having improved strength and fatigue resistance. The root of the thread is cut on multiple cutting radii having displaced centers. At least two of the root surfaces are formed by cutting radii having lengths that are greater than the root truncation. The threads are used in a double start configuration to increase the connection strength and reduce makeup and breakout rotations.

Abstract: A screw type fastener for use in fastening drywall to a structural member while generating a gap between structural member and drywall to produce sound insulation, the fastener including a shank having a head end and a point end, a first threaded section and a second threaded section, said first threaded section being closer to said point end than said second threaded section, said first threaded section having threads that have a first pitch and first thread diameter, said second threaded section having threads that have a second pitch and a second thread diameter larger than said first thread diameter, wherein when the screw type fastener is screwed through drywall into a structural member, a gap is generated between said structural member and drywall.

Abstract: In a roof system, a top coat of lightweight insulating concrete is anchored to an underlying base slurry coat of lightweight concrete and a metal, gypsum, tectum or concrete roof deck by installing anchoring devices at spaced intervals. The anchoring devices may be made of plastic, steel or aluminum and include a threaded shank extending upwardly from a base plate. The anchoring devices are installed by fastening the base plates to the underlying roof deck structure or by setting the base plates in the lightweight base concrete slurry coat so that the threaded shanks of the anchoring devices extend upwardly through holes in EPS board insulation and into the subsequently applied top coat of lightweight insulating concrete. The base plate and threaded shank effectively anchor the attachment of the lightweight insulating concrete top coat to the underlying base slurry coat and roof deck to enhance resistance to wind uplift forces.

Abstract: The present invention relates to a screw with the distal end forming a cone-shaped portion, and a first and a second thread segment defined on the shank and the cone-shaped tip portion. Moreover, the first thread segment forms a thread peak and the second thread segment forms a plane surface; besides, said plane surface converges toward the thread peak of the first thread segment. Therefore, at the beginning of screwing, said plane surface of the second thread segment drills into the object to enlarge the channel. Since the channel is enlarged, the second thread segment can enter the object with less friction and higher screwing speed. Besides, the cutting debris can be removed from the space between the enlarged channel and the first thread segment to avoid cracking in the object and to maintain a better effect on fastening.

Abstract: The invention relates to a hoisting device (1), in particular for a vehicle, including a substantially vertical column forming a frame (2) and lifting means (6) movable alongside said column (2) under the action of the control, by adequate driving means (12), to cause a threaded rod (9) to rotate and a nut (13) integral with said movable lifting means (6) on which the load to be lifted is designed capable of resting to move along the latter. In this hoisting device, the threaded rod (9) includes, at its lower end (14), a removable extension ferrule (15).

Abstract: An internal combustion engine connecting rod is designed with bolts having a minimum required strength. A strength safety factor Sfa is calculated based on an axial strength limit load FX of the bolt and the maximum load FB to be born by the bolt due to a piston inertia force (Sfa=FX/FB) acting on the connecting rod. A mating surface separation safety factor Sfb is calculated based on the tensile load (FB?FC) resulting from the piston inertia force and the load FE carried by the bolts at a mating surface separation limit, i.e., the maximum bolt load FE at which the connecting rod main body and the cap remain in contact without separating (Sfb=FE/(FB?FC)). The mating surface separation safety factor Sfb of the connecting rod is set to be equal to or larger than the strength safety factor Sfa of the bolts (Sfb?Sfa).

Abstract: A mechanical fastening device and method to secure a sheet liner assembly defining the walls, doors, roof and/or floor of a freight container. The anchor fastener comprises a helically formed main body having a pointed lead end configured to slice through an intermediate insulation liner of the liner assembly. A drive head is positioned at a second end of the helix to allow the device to be engaged and rotated about its longitudinal axis to drive the helical coil through the sheet liner to become embedded within the insulation liner. The drive head sits against the sheet liner which is urged against the intermediate insulation liner.

Abstract: A thread-cutting screw (1) serves for being screwed into the bore-hole wall (1a) of a bore-hole (1b). It comprises a substantially cylindrical core (2) of metal which has a central longitudinal axis (4), a thread (5) forming one piece with the core (2), and at least one cutting element (6, 7), disposed within the thread (5), for cutting engagement with the bore-hole wall. The core (2) consists of a metal of a carbon content between 0 and 0.5 percent by weight. The at least one cutting element (6, 7) is fixedly connected with the core (2), constituting a welded structure of a metal with a carbon content greater than 0.8 percent by weight. Being safely connected to the core (2), the cutting elements (6, 7) offer efficient cutting operation, with any risk of brittle fracture of the screw (1) being precluded.

Abstract: The present invention in particular to provide screw thread divided into the first and second thread section. A plurality of slots disposed on each of first thread section, which divided into a plurality of thread segments, wherein each of the thread segment have a first inclined surface and second inclined surface on two ends thereof; the first inclined surface paralleling and incline to the second inclined surface. Accompanying with the thread peak of second thread section formed as sawtooth-shaped; therefore, during the operation, utilize the second inclined surface guiding, the first inclined surface to sharp cutting and remove off the cutting debris, hence to attain the lower screwing resistance, enhance the screwing speed and the tightness effects.

Abstract: A fastener including a body having a predetermined axial length, wherein the body includes a screw head at one axial end of the body, a threaded portion at an opposite axial end of the body and an unthreaded shank portion extending between the screw head and the threaded portion, and wherein the shank portion has an axial length in excess of at least one-third of the axial length of the fastener body.

Abstract: A threaded device such as a self-tapping screw or bolt, particularly for use in medical applications, provides a low-torque design that prevents a steady increase in the amount of torque necessary to drive the device into material as the device progresses. The design includes a thread that has a proximal section with a reduced diameter, thereby reducing the overall contact area between the thread and the material.

Abstract: A threaded fastener includes a curved-line path thread provided in a helical pattern along a shank of the fastener. The curved-line path can be provided on either side of the standard straight-line path or on opposite sides of the straight-line path. The curved-line path and can be provided on all or a portion of the thread from near the tip end thereof to near the head end thereof.

Abstract: This invention provides a fastener system having an external thread cross section profile that includes a novel asymmetrical thread addendum that does not have the disadvantage of centralizing the external bolt thread in the internal nut thread cavity. By overcoming the disadvantages of prior art symmetrical thread profile, there will be seen a more useful and efficient use of the forces applied during the application of the externally threaded fastener, toward thread locking and improved resistance to loosening from outside influences such as assembly vibrations and the like. In an illustrative embodiment the addendum extends radially outward from the leading and trailing face profile of the external thread. It can be defined an associated addendum leading edge and trailing edge that are each approximately linear. The trailing face can have a radius profile in one embodiment. In further embodiments, the leading face can also be radiused.

Abstract: An implant is arranged with a thread which can be exposed to a jaw bone and which has a first extent in the longitudinal direction of the implant. Thread flanks are assigned second extents between the inner and outer peripheries of the thread. Along all or most of the first extent, the thread flanks are arranged with one or more grooves that can extend in the peripheral direction and can be situated on the second extents. The groove or grooves are arranged to participate in the process by which the implant fuses with the jaw bone (2).

Abstract: An improved dual threaded fastener for composite materials having a head and a shaft. The head is affixed to one end of the shaft and the shaft includes a point at its other end. The shaft includes an upper threaded portion and an upper threaded portion. The diameter of the shaft within the lower threaded portion is greater than the diameter of the shaft within the upper threaded portion. In this manner, as the fastener is rotated within the workpiece, producing remnants may be stored in the area surrounding the upper threaded portion.

Abstract: A flat portion 12a and a slope portion 12b are provided on a thread 12 of a multi-pitch screw 10 alternately. The flat portion and the slope portion are provided on the thread of a multi-pitch nut which fastens with this. Consequently, a screw and a nut capable of preventing loosening securely by step are achieved. This enables comfortable and quick feeding and when a torque from a driving source is interrupted, step-like self-lock is activated.

Abstract: A looseness resisting screw formed with an external thread includes a first thread area having a substantially uniform outer diameter and a second thread area extended from the first thread area toward a leading end of the screw. The second thread area has a plurality of fractional lead parts each of which has an outer thread diameter increasing along a helical direction of the fractional lead part from a start point to an end point, and the outer thread diameter is substantially equal to a thread root diameter at the start point, while the outer thread diameter is equal to a thread top diameter at the end point. The fractional lead part has a thread sectional area increasing along the helical direction from the start point to the end point, and the thread top diameter of the fractional lead part is slightly larger at the end point than the substantially uniform outer diameter of the first thread area so that the second thread area provides a tapping thread section.

Abstract: A threaded screw fastener is provided with a head portion that has integrally incorporated therein dual drive structure whereby the single threaded screw fastener can be rotatably driven by alternative rotary drive socket implements or tools, such as, for example, hexagonally configured or Phillips head configured drive tools or implements, or a combination drive tool. A drive socket implement or tool also has integrally incorporated therein both hexagonally configured drive structure, Phillips head drive structure, and domed contour structure for not only structurally engaging both the hexagonally configured structure and the Phillips head structure integrally incorporated upon the head portion of the threaded screw fastener, but in addition, accommodates the low profile domed structure of the head portion of the threaded screw fastener.

Abstract: A screw includes a first thread on the shank and located close to the point of the shank, and a second thread which is connected to the first thread and extends toward the head of the screw. Each of the first and second threads includes an upper flank and a lower flank. A first angle is defined by an intersection of the upper flank and the lower flank of the first thread, and is larger than a second angle defined by an intersection of the upper flank and the lower flank of the second thread. The first thread bears larger torque and the second thread includes sharper cutting edges.

Abstract: A threaded fastener comprises a first, primary thread lead, and a pair of second, auxiliary thread leads alternatively interposed between successive threads of the first, primary thread lead, except within the vicinity of the tip portion of the fastener so as to define space for accommodating debris generated during the self-tapping of the fastener into a workpiece. The fastener also comprises lobe members formed upon the primary thread lead so as to predeterminedly affect torque insertion and pull-out resistance values.

Abstract: A press fit fastener (1) includes a shank (2), a head (3) and a press fit portion (4) being located at the shank (2). The head (3) is located at the first end of the shank (2). The press fit portion (4) includes a multiple helical profile (5). The helical profile (5) has a beginning portion (6) and an inclination portion (8). The outer diameter of the inclination portion (8) is designed to increase in a direction towards the head (3) to reach a maximum outer diameter. The maximum outer diameter of the inclination portion (8) is spaced apart from the head (3).

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: The invention relates to a screw fastener comprising a threaded shank having a force application means for torque transmission and a screw fastener point. The threaded shank consists of a shank core and a self-tapping thread, and the thread is designed as a prominence which runs helically over the shank core, is defined by two flanks meeting in an outer thread edge and has a radial height (H). The outer thread edge, at least in a section of the thread, runs in a wavelike manner in the radial direction with an amplitude between wave crests having the height (H) and wave troughs having a height (h) reduced by the amplitude.

Abstract: The screw with a plurality of helix angles comprises a first section having a first thread with a first helix angle, at least one third section having a third thread with a third helix angle; and a fifth section having a fifth thread with a fifth helix angle wherein the fifth thread is identical to the first thread. The third helix angle is equal or not equal to the first helix angle. Moreover, the screw further comprises a second section connected between the first section and the third section; the second section having a second thread with a second helix angle; a fourth section connected between the third section and the fifth section; and the fourth section having a fourth thread with a fourth helix angle. A mold device for forming the screw is also included. The mold device further comprises a second mold line-symmetrical to the first mold.

Abstract: A pole joint screw may be used to connect a first section of a basketball support pole and a second section of a basketball support pole. The pole joint screw may include an elongated body including a first end and a second end, a head disposed on the first end of the elongated body, a threaded portion disposed on the second end of the elongated body, and a gap disposed between the head and the threaded portion. The gap is preferably sized and configured to receive a portion of the first section of the basketball support pole and a portion of the second section of the basketball support pole. The pole joint screw preferably freely rotates when the portion of the first section of the basketball support pole and the portion of the second section of the basketball support pole are located in the gap.

Abstract: A male threaded fastener particularly suited for use in plastics has a high thread and a low thread. Depressions are provided in the pressure flank of the high thread. Dimensional relationships are defined for scaling the fastener to commonly accepted sizes.

Abstract: A self-drilling fastener for attaching wood substrates to metal substrates comprises an elongate shank defining an axis, the shank having a first end and a second end. A drilling tip having a drill point and an axial length is formed at the first end. A broad head is formed at the second end. The shank includes a threaded portion and an unthreaded portion. The threaded portion axially extends from the drilling tip towards the head and includes helical threads and has an axial length, a root diameter, and a thread diameter. The length of the threaded portion is greater than the length of the drilling tip. The unthreaded portion axially extends from the threaded portion to the head and has an axial length and a diameter. The length of the unthreaded portion is substantially greater than the length of the threaded portion and the diameter of the unthreaded portion is smaller than the thread diameter of the threaded portion.

Abstract: A fastener for securing a 0.625 inch (? inch) thick gypsum wallboard panel to a wooden building frame. The fastener includes a body having a predetermined axial length. The body includes a cupped head at one axial end of the body, having a diameter that is at least in excess of 0.297 inches ({fraction (19/64)} inches), a threaded portion at an opposite axial end of the body and an unthreaded shank portion extending between the cupped head and the threaded portion, wherein the shank portion has an axial length that is at least in excess of one-third of the axial length of the fastener body, and a shank portion diameter that is at least in excess of 0.098 inches.

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 screw with protruding sheets on a head portion comprises a thread portion; a screw tail at one end of the thread portion, a slot formed on the screw tail; a plurality of screwing sheets formed at another end of the thread portion; a plurality of recesses formed between the plurality of screwing sheets for removing undesired pieces; a drilling head being formed at front ends of the screwing sheets; the drilling head formed with a plurality of protruding sheets made of soft metal. By screwing the screw by rotating from the slot, the screw will rotate so as to drill a hole and enter into a wood plate. Then the protruding sheets enlarge the hole. The undesired wood pieces are removed from the recesses. When the screw further drills into a metal plate, the protruding sheet will be worn out because the protruding sheet is made of soft metal.

Abstract: An improved lockable fastener that can be employed in a circuit breaker application includes a first member and a second member that are threadably cooperable with one another and a locking member that extends between the first and second members to resist loosening of the first and second members. The second member includes a threaded shank that is threadably received in a first threaded portion of a cavity formed in the first member. The locking member includes a threaded body and a taper, with the threaded body being threadably receivable in a second threaded portion of the first member, and with the taper being at least partially receivable in a receptacle formed in the shank of the second member. The receptacle defines a seat on the shank, and the taper engages the seat to deform at least a portion of the shank into engagement with a ledge that is interposed between the first and second threaded portions of the cavity.

Abstract: A screw member having a loosening prevention function is provided to improve a fastening power and a relative strength in thread connection. With an arrangement to provide a first crest portion and a second crest portion at the opposite ends of a thread point, a first screw member generates a loosening prevention effect due to elastic deformation of the first crest portion and the second crest portion, with the entire thread flank from the base portion to the point brought into contact with a second screw member on the both surfaces of the thread flanks. With this arrangement, a strong fastening power can be obtained, and a clamping force applied to the thread is distributed over the thread, thereby enabling improvement in the relative strength in thread connection.

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: The invention relates to a process for producing a protective layer on a bolt, in which an aluminum-containing high-temperature lacquer is first of all applied to the bolt and then cured and stoved at a defined stoving temperature. The screw thread is additionally lubricated prior to installation of the bolt. This process reduces oxidation and ultimately reduces seizing of the screw connection.

Abstract: A male threaded fastener particularly suited for use in plastics has a high thread and a low thread. Depressions are provided in the pressure flank of the high thread. Dimensional relationships are defined for scaling the fastener to commonly accepted sizes.

Abstract: A new and improved threaded fastener comprises a first, primary thread lead, and a pair of second, auxiliary thread leads alternatively interposed between successive threads of the first, primary thread lead. The threaded fastener further comprises a pointed tip portion for initiating driving insertion of the threaded fastener into an underlying workpiece, and that portion of the dual reinforcing lead, which has previously been interposed between the tip portion and the primary thread lead, or between the first and second successive threads of the first primary thread lead, has been removed.

Abstract: A new and improved thread rolling die for forming a new and improved threaded fastener, and a new and improved method or technique of manufacturing the new and improved threaded fastener, is disclosed wherein the new and improved threaded fastener comprises a first, primary thread lead, and a pair of second, auxiliary thread leads alternatively interposed between successive threads of the first, primary thread lead. As a result of the provision of the pair of second, auxiliary thread leads being interposed between successive ones of the threads of the first, primary thread lead, not only is additional axial reinforcement provided for the threaded fastener, but more importantly, the lateral or transverse distance through which the material comprising the blank member must be displaced or moved in order to form the successive threads of the first, primary thread lead is substantially reduced.

Abstract: A pole joint screw may be used to connect a first section of a basketball support pole and a second section of a basketball support pole. The pole joint screw may include an elongated body including a first end and a second end, a head disposed on the first end of the elongated body, a threaded portion disposed on the second end of the elongated body, and a gap disposed between the head and the threaded portion. The gap is preferably sized and configured to receive a portion of the first section of the basketball support pole and a portion of the second section of the basketball support pole. The pole joint screw preferably freely rotates when the portion of the first section of the basketball support pole and the portion of the second section of the basketball support pole are located in the gap.

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: A structure including a pair of helically wound interlocking forms located on a cylindrical closure for an open headed medical implant and in a receiver between arms of the implant respectively. The interlocking forms each include overlapping gripping elements that engage mating elements during assembly to prevent radial splaying of arms of the implant.

Abstract: An internally threaded body member having thread clearances includes a bore extending at least partially into the body member. The bore has a screw thread disposed therein. The screw thread has a pitch diameter increased not less than 26% of a tooth height of the thread.

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: A thread forming screw configured for insertion into relatively hard plastics includes an elongated core region having two ends, a head at one end and a point at the opposite end, a helical thread extending generally radially from the core region, the thread being asymmetrical when viewed in a cross-section taken through a diameter of the core, the thread defining a flank angle made up of a leading angle, facing the point, and a trailing angle facing the head, the leading angle being greater than the trailing angle.

Abstract: The object of the present invention is to dissolve effectively the problems of the encroaching, the seizure, and the racing. To attain said object, a bolt having a threaded shank portion wherein a notch slanting toward the end of said threaded shank portion at an angle in the range between 15° to 80° for the axis of said threaded shank portion is formed at the beginning of the complete thread part to expand the width of the entrance of the thread part of said thread shank portion is provided in the invention.

Abstract: The present invention is directed to provide a tapping screw for a soft material having a sufficiently large stripping torque compared to a driving torque and an increased tolerance of a fastening torque, and characterized in that it has threads each having a leading flank and a following flank, the leading flank being designed to be steeper than the following flank, that an R is imparted to a crest of each thread on the following flank side, that an R is also imparted to each flank at a portion contiguous to a root thereof and that the former R and the latter R being designed to connect smoothly to each other at the root.

Abstract: A self-drilling fastener for attaching wood substrates to metal substrates comprises an elongate shank defining an axis, the shank having a first end and a second end. A drilling tip having a drill point and an axial length is formed at the first end. A broad head is formed at the second end. The shank includes a threaded portion and an unthreaded portion. The threaded portion axially extends from the drilling tip towards the head and includes helical threads and has an axial length, a root diameter, and a thread diameter. The length of the threaded portion is greater than the length of the drilling tip. The unthreaded portion axially extends from the threaded portion to the head and has an axial length and a diameter. The length of the unthreaded portion is substantially greater than the length of the threaded portion and the diameter of the unthreaded portion is smaller than the thread diameter of the threaded portion.