Abstract: A self-drilling fastener from which objects may be hung, for use in a friable material with or without an underlying member at the point of use or in a semi-rigid material such as a hollow core door comprises an elongated body having a threaded exterior with separate threads for drilling into the member, gripping the member, gripping the friable material and/or gripping the semi-rigid material. The fastener may further have a thread having a relatively small-diametered solid portion from which objects hang and an axially expanding angled portion for biasing the object toward the solid portion to stabilize and prevent the object from dislodging from the fastener.

Abstract: A masonry anchor includes a head and a body integral to the head and extending therefrom. At least one helical male thread surrounds the body and includes a leading face and a trailing face substantially perpendicular to the body disposed between the leading face and the head. The trailing face intersects the leading face at a thread crest.

Abstract: In a bolt of the present invention, a guide portion having a small diameter is formed at the distal end of a shaft portion and ridge having an inverted direction screw configuration relative to the ridge formed on a constant diameter portion is formed. When the bolt is inserted obliquely into a nut and the ridge gets into engagement with a female screw portion of the nut, an effect of floating the bolt is generated, and the bolt cannot be driven into the nut unless it is set in an appropriate tightening posture. Consequently, biting and seizing of the bolt to the nut can be prevented securely. If the ridge is formed into a double threaded screw having an inverted direction screw configuration, the effect can be further intensified.

Abstract: A fastener for use in concrete includes a shank and a head. The shank has a tip distal most from the head. The shank includes a first helical thread formation having a thread form thereon formed from two portions disposed upon opposite lateral sides of the thread form. The thread form has a root and the two portions include an alternating series of lobe members and base portions. The lobe members have a height as measured from the root and the base portions have a height as measured from the root. The height of the lobe members is greater than the height of the base portions and the height of the base portions is greater than zero. The fastener includes a second helical thread formation that is disposed adjacent to and spaced from the first helical thread formation.

Abstract: A screw, in particular a self-tapping screw, has a screw thread which covers up to the front end of the screw formed as a drilling tip or cutting tip. In the front area, starting with a distance from the front end of the screw, there is an opposite thread showing the same pitch as the screw thread, however, its thread height is lower than the thread height of the screw thread. This second, opposite single-thread, double-thread or triple-thread/multi-thread forms a cutting edge with its thread edge which is used to cut fibers in order to reduce wedge effect during screwing in the screw. The screw is particularly suitable for wood or wood-like materials in the edge areas of structural elements.

Abstract: The invention relates to an extrusion blow-molded component (1) made of thermoplastic resin. The component (1) preferably comprises a recess in the exterior wall, the recess being configured as a blind bore (2) provided with at least one convolution (4). The blind bore (2) serves to receive a complementary fastening element (6) equipped with a threaded stem (17). A contour is provided in the region of the orifice (3) of the blind bore (2), the contour positively interacting with a contour that is complementary on the fastening element upon insertion of the fastening element (6), wherein the angular position of the contour (2) is selected such that inserting the contours into each other is possible only by overcoming an axial tension that is built up due to the rotating movement of the parts to each other under elastic deformation of the plastic (FIG. 1).

Abstract: A screw includes a shank portion including a tapered bottom section having a tip, a head on top of the shank portion, and first and second helical threads. The first helical thread extends helically around the shank portion in a first direction between the tip and the head, and has a first end distal from the head, and a second end opposite to the first end. The second helical thread extends helically around the shank portion in a second direction between the first helical thread and the tip, and has a third end proximate to the second end of the first helical thread. The first and second directions are opposite to each other. A non-helical ridge extends around the shank portion between the first and second helical threads.

Abstract: The present invention pertains to a bimate screw providing with a first section alternating with a second threaded section; wherein, the second threaded section has a smaller outer diameter than the first threaded section, and further a plurality of concavities are disposed on each thread of the second threaded section for defining two flanks therein. In this manner, both the first and the second threaded sections facilitate to sever and shatter cuttings so as to reduce the screwing resistance and prevent the object from being damaged under the accumulation of cuttings; simultaneously, the bimate screw effectively attains to a good resistance of extraction from the object by the concavities receiving the remaining cuttings which are not guided out of the object.

Abstract: A screw includes a shank portion including a tapered bottom section having a tip, a head on top of the shank portion, and first and second helical threads. The first helical thread extends helically around the shank portion in a first direction between the tip and the head, and has a first end distal from the head, and a second end opposite to the first end. The second helical thread extends helically around the shank portion in a second direction between the first helical thread and the tip, and has a third end proximate to the second end of the first helical thread. The first and second directions are opposite to each other. A non-helical ridge extends around the shank portion between the first and second helical threads.

Abstract: A thread forming fastener for threading into a nut anchor of a pliable material wherein there is produced during the driving of the fastener a combination of forces that encourages the nut anchor material to flow smoothly and to develop a mating thread in the nut anchor that minimizes stress cracking and radial hoop stress as the mating thread is being formed. The fastener comprises a drive head and a shank extending from the head and having a longitudinal axis, the shank including a core and a thread having a selected axial pitch, a selected thread height and a profile which in axial cross-section includes a leading face, a trailing face and a tip. The leading face is composed of a radially inner concave portion having a first radius and which transitions smoothly to a radially outer convex portion having a second radius, the transition occurring at a point on the common tangent to those portions.

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. 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, the formation of the first, primary threaded lead, upon the threaded fastener, is facilitated.

Abstract: The present invention is in particular to a first threaded section and a second threaded section both consisted of a plurality of threads are spirally disposed on the shank and connecting each other. Moreover, said first threaded section is a continuous threaded section, and said second threaded section is a non-continuous threaded section. While in operation, with said first threaded screwing, the user can save more labor in screwing the present invention. Further accompanying with said non-continuous second threaded section, the debris cut from the object can be accumulated inside said second threaded section and connected together. Therefore, the present invention will be well fastened into the object after screwing.

Abstract: A screw is provided that includes a head from which a shank extends. The shank has an end section at a distal end that includes a drilling portion. A conically-shaped tip potion is disposed at the distal end of the drilling portion and at least one guiding thread is spirally formed on the conically-shaped tip portion. A cutting edge is defined in the drilling portion by at least one groove formed therein.

Abstract: A shape of a screw for fastening thin-sheets or thin-walled parts is characterized in that a value of ratio (P/D) of a pitch (P) to each of nominal diameters (D) of coarse thread in the shape of screw thread is reduced as compared to values of ratio of pitches to a corresponding nominal diameter of coarse thread in known kinds of screw thread standard, and the multiple number of thread start is set to 2 or more. Thus, for the thin-sheets and thin-walled parts in which three engaging ridges of screw threads cannot be secured when current metric coarse thread screw is used, the shape of the screw thread advantageous in strength and excellent in loose torque after vibration can be provided, since screw fastening is stabilized more than a case in which the metric coarse thread screws are used.

Abstract: A deck screw and an installation method is intended for use with composite lumber, although it can be used with other products. The deck screw may be provided with a head and a shaft that has two regions of varying diameter. The upper region has threads that exceed the number of threads of the lower shaft, on a unit length basis. The threads of the upper shaft may be configured in an inverted buttress design. The lower region of the shaft terminates at a tapered distal end having a pointed tip that leads the screw through the wood material. The head of the screw is provided with an upper surface, a lower surface, and a crown that extends around the perimeter of the head. The crown extends beyond the lower surface of the head, forming a recessed region between the lower edge of the crown and the shaft of the screw. During installation the geometry of the deck screw functions to direct and capture displaced composite material to prevent volcanoing.

Abstract: A screw for plastic articles includes a head, a shank having an insertion end and a coupling end adjacent to a bottom face of the head, a first thread, and a second thread. The first thread is formed on the shank and extends from the insertion end through the coupling end of the shank. The first thread includes a plurality of convolutions. The second thread is formed on the coupling end of the shank and intermediate the convolutions of the first thread. The second thread has a major diameter smaller than that of the first thread. The first thread includes a plurality of crests. A root is defined between two adjacent crests of the first thread outside the coupling end and has a profile defined by two straight lines that forms an angle of 120-160 degrees therebetween.

Abstract: A screw with two threads having different orientations is disclosed. The screw having a flat surface at a bottom side of the screw head; an annular recess being formed in the flat surface and around the screw rod; an upper thread formed at an upper portion of the screw rod; and a lower thread connected to the upper thread and formed on a lower portion of the screw rod and the tapered portion; a thread pitch of the lower thread being equal to that of the upper thread; an outer diameter of the lower thread on the screw rod being equal to that of the upper thread. Furthermore, each of upper thread and lower thread has a triangular cross section; and the slope angle of an upper side of each of the upper thread and lower thread is greater than that of the lower side of the respective one of the upper thread and lower thread.

Abstract: A threaded fastener, such as a screw, includes a head, a tapered tip portion including a pair of opposing lands disposed between a pair of flutes, and a shank that extends between the head and the tapered tip portion. The shank includes a first threaded portion and a second threaded portion. The first threaded portion of the shank extends along a portion of the shank and at least a portion of the tip portion. The second threaded portion of the shank extends along a portion of the shank between the head and the first threaded portion.

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: 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: The invention relates to a self-boring and thread-forming tapping screw having a screw shaft with a screw tip at one end and at the other end a force application member for the transmission of a turning moment. The screw shaft includes a threaded section with the screw tip and an adjacent thread-free section of the shaft including the force application member. The threaded section has a shaft core and a self-tapping thread. The threaded section includes a core section axially displaced from the tip and having a polygonal core cross section. Corners of the core cross section define an enveloping circle with an enveloping circle diameter larger than a shaft diameter of the thread-free section.

Abstract: A threaded fastener has opposite hand threads provided thereon for securing two components together, such as a companion flange and a flange yoke assembly that is used in a vehicular drive train system. The companion flange includes a hollow cylindrical sleeve portion and a disc-shaped flange portion having an aperture formed therethrough. The flange yoke includes a disc-shaped flange portion and a yoke portion having an aperture formed therethrough. The flange yoke aperture is aligned with the companion flange aperture. A threaded fastener extends through the companion flange aperture and the flange yoke aperture. The threaded fastener includes a first threaded portion having a first hand that is disposed within the companion flange aperture. The threaded fastener further includes a second threaded portion having a second hand that is disposed within the flange yoke aperture.

Abstract: A deck screw is intended for use with composite lumber, although it can be used with other wood products, such as pressure treated lumber. The deck screw has a head and a shaft that has two regions of different diameter. The upper region has threads that exceed the number of threads of the lower shaft, on a unit length basis. The threads of the upper shaft may be configured in an inverted buttress design. The lower region of the shaft terminates at a tapered distal end having a pointed tip that leads the screw through the wood material. Threads are provided on the lower region of the shaft. A crown extends around the perimeter of the head.

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 thread-cutting screwed dowel has an essentially cylindrical, sleevelike dowel body with an axial bore and with a load engagement device disposed in the interior of the dowel body, for example with a female thread. On its outer face, the dowel body is equipped with at least one cutting edge, which extends helically along a majority of the outer face of the dowel body and protrudes radially past it. The helical cutting edge is embodied as a primary cutting edge and wraps around the dowel body over its length in at least three windings. Besides the load engagement device, an additional engagement is provided for transmitting a torque in the interior of the dowel body.

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 screw which can be more quickly screwed into a work piece and has better chip-exhausting effect. The screw has a rod body and higher thread and lower thread formed on the rod body. On a conic section of the screw, a cutting thread with another guide angle larger than the guide angle of the lower thread directly extends from the lower thread. Accordingly, the lower thread of the screw has better cuffing, drilling and chip-exhausting function. Alternatively, the screw can have single thread or double threads with equal height. On a predetermined section of the rod body of the screw, a cutting thread with changed guide angle is directly formed as a part of the thread to achieve better cutting, drilling and chip-exhausting function.

Abstract: A fastener adapted for anchoring into a masonry structure, such as a concrete block, employs an epoxy resin system so that the fastener is both mechanically engaged and bonded to the structure. In one preferred configuration, the bead is composed of a hardener, a resin and a nylon powder and has a cardioid-shaped configuration which subtends substantially 360° around the shank at an intermediate position of a threaded portion of the fastener. Various configurations are disclosed, including a fastener wherein adhesive in microencapsulated form is also applied to a lower intermediate portion. In addition, wings may extend from the shank.

Abstract: A vehicle-mounted equipment carrier includes a base having a support member that is movable between an operative position and an inoperative position. An engagement member maintains the position of the support member, and is movable between an engaged position and a release position. The engagement member is movable between the engaged position and an intermediate position by a threaded connection with the base, is movable between the intermediate position and the release position by a sliding connection with the base. The shaft includes a threaded section that engages a threaded opening in the base, for providing movement of the engagement member between the engaged position and the intermediate position upon rotation of the engagement member, and an unthreaded section that moves the shaft axially within the opening for moving the engagement member between the intermediate position and the release position.

Abstract: A self-tapping masonry anchor includes an axial bore that is formed at one end and extends through a portion of the anchor.

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 metal fastener for frangible material has a threaded shank, a head proximate one end of the shank and a tip at the opposite end. The fastener has a coarse pitch and relatively large ratio of major to minor diameters suited for securing the fastener into frangible material such as drywall or masonry.

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 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 second material is fastened to a first material by a tapping screw having a male thread. The first material includes a hole and a concave portion around the hole. The hole has a surface in which a female thread is formed as the tapping screw is screwed in.

Abstract: An anchoring screw with triple threads of different depths of thread especially useful for coupling with a construction hole on a cement wall (or other construction boards and panels) includes a first bolt section, a tool driven section and a second bolt section. The second bolt section has a first screw thread, a second screw thread and a third screw thread of different depths of thread formed on the outer surface that are spaced from one another at 120 degrees. Thus, the screw threads can gather extruded cement debris when the screw is fastened into the construction hole to produce a stronger fastening effect. As there is no expansion incurred, the wall or board does not crack. Therefore, the interval between the construction holes may be shortened, and the number of construction holes may be increased in a given unit area. The anchoring screw of the invention also may be removed easily and conveniently to facilitate construction.

Abstract: A thread-forming screw includes a head and a shank, the shank having a thread and a thread-forming zone at the end opposite to the head, the thread-forming zone also having a thread portion. The shank at the end opposite to the head has a spherical portion with a maximum diameter in a plane perpendicular to the axis of the shank which corresponds approximately to the mean diameter of the thread of the shank.

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: An improved fitting having an improved flexible tubing tip to connect to flexible tubing, e.g., FUNNY PIPE brand polyethylene pipe, used for sprinkling systems and other fluid delivery systems. According to one aspect of the present invention, one or more annular barbs are positioned at or toward the back of the portion of the fitting inserted into the flexible tubing, with a threaded or spiral or helix portion being positioned at the front of the portion of the fitting inserted into the flexible tubing. According to another aspect of the present invention, the threaded or spiral or helix portion of the fitting is slightly tapered to facilitate insertion into the flexible tubing. According to yet another aspect of the present invention, a double helix spiral thread is used.

Abstract: A paint spraying gun with a gun body and a material supply device that are connected to one another by a screw-wedge connection. The screw-wedge connection includes a screw-wedge element that is arranged on the circumference of an essentially hollow-cylindrical connecting part of the material supply device, and a corresponding counter element on the gun body. The connection is inexpensively manufactured and easily handled. The screw-wedge element extends in an arc over more than half of the circumference of the connecting part with the ends of the screw-wedge element being peripherally spaced from one another. The counter element is an arcuate projection arranged on one side of and above a receiving bore of the gun body.

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: A faster 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 fastener system includes means for latching the tilt of the coil so as to minimize the constraining forces and optimize the motion of the helicoil, that results in the screw or bolt being pushed into the substrate.

Abstract: A screw having a primary thread extending along its shank and terminating at the screw head is formed with a supplemental thread extending between adjacent convolutions of the primary thread and also terminating at the head of the screw. The spaced termini of the two threads maintain a washer at the head in a position perpendicular to the axis of the shank of the screw.

Abstract: A fastener system and method of inserting it, that includes a screw or bolt having two interleaved helical threads, which brackets or forms a groove for 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 fastener system includes means for latching the tilt of the coil so as to minimize the constraining forces and optimize the motion of the helicoil, that results in the screw or bolt being pushed into the substrate. The fastener may be actuated after it has been partly or completely turned into the substrate.

Abstract: A ratcheting fastener system such as for point of purchase displays. A bolt has a shank with a head end and a distal end, and a plurality of bolt threads on the shank, each thread having a thread start at the distal end. A nut has a bore with a plurality of thread segments in the bore adapted for engaging the bolt threads when axial force is applied to the bolt with the distal end inserted in the nut. Deflection of the nut thread segments occurs in controlled locations. The bolt and nut can be formed as a single unit connected by a frangible link.

Abstract: A bolt is provided with a head part and a shank part. The shank part includes a first constant diameter cylindrical part, a transition part, a cylindrical connection part, and a second constant diameter cylindrical part concentrically extending from the first constant diameter cylindrical part to the second constant diameter cylindrical part. The first constant diameter cylindrical part has a screw thread with a predetermined pitch formed on the side surface thereof. The transition part has a tapered shape and has a screw thread with a predetermined pitch formed on the side surface thereof. The cylindrical connection part has a diameter smaller than that of the first constant diameter part. The second constant diameter cylindrical part has a diameter smaller than the first constant diameter part, and has a screw thread with a predetermined pitch formed on the side surface thereof. The crest part of the screw thread formed on the side surface of the transition part is truncated.

Abstract: A wood screw is provided which can be smoothly driven in with a small driving force. Helical ribs that are the highest at the center and gradually lower toward both ends are formed on the outer periphery of the tip of a shank having threads on the outer periphery at intervals of 180° in the circumferential direction. Each helical rib is a discontinuous body formed by a plurality of protrusions having different heights. This reduces the turning resistance imparted to the helical ribs, thereby reducing the driving force required.

Abstract: A fastener is formed of an axially extending shaft (2) and a driving head on the end directed away from the setting direction, and has on its underside or first side (9) for the prevention of unintended loosening, a plurality of webs (12) extending radially from the longitudinal axis (L) of the shaft up to the external periphery (11) of the underside (9). The webs (12) having a substantially trapezoidal cross-section, are limited by a face surface (13) on the underside (9), extending between two flank surfaces.

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.