Abstract: A screw includes a shank where a thread helix receiving groove winds around the shank and is disposed in the shank. A thread helix is disposed in the thread helix receiving groove where the thread helix has an expandable helix section. The shank has, at the thread helix receiving groove, a wedge flank for radially expanding the expandable helix section as the shank is moved relative to the expandable helix section. The expandable helix section has a helical back and a plurality of expansion fingers projecting axially from the helical back towards the wedge flank. The wedge flank of the thread helix receiving groove is configured for radially displacing the plurality of expansion fingers outwardly as the shank is moved relative to the plurality of expansion fingers.

Abstract: An anchoring system for attaching equipment to a building foundation. The system includes an insert attached to the foundation by an adhesive, wherein the insert includes a flange that is positioned on a top surface of the foundation. The system also includes a washer element having a recessed portion for receiving the flange, wherein the washer also contacts the top surface. In addition, the system includes a rod element having a reference element, wherein the rod element is threadably engaged with the insert and the washer and wherein when the reference element is aligned with a reference plane indicative of level equipment, the washer is tightened against the top surface to preload the rod element to minimize deflection of the equipment.

Abstract: A foreign object removing socket adaptor includes a pusher, an adaptor, an external thread, an internal tread, and a stop. The pusher includes a drive head and a main shaft. The adaptor includes a tool body, a socket attachment body, and a main channel. The drive head and the main shaft are adjacently connected to each other. The external thread is laterally connected around the main shaft. The stop is radially connected around the main shaft, opposite of the drive head. The tool body and the socket attachment body are adjacently connected to each other. The main channel concentrically traverses through the tool body and the socket attachment body. The internal thread is laterally connected within the main channel. The main shaft is threadedly engaged with the main channel through the external thread and the internal thread.

Abstract: A bone screw is provided including a longitudinal core member having a longitudinal axis defining a longitudinal direction and having an outer surface and a helical groove in the outer surface, the groove being defined by opposed sidewalls; and a helical thread body configured to be accommodated in the groove. When the thread body is assembled in the groove of the core member and when the core member is straight, the thread body is configured to abut one opposed sidewall without abutting the other opposed sidewall along a full turn of the thread body, the thread body is configured to slide in the groove between the opposed sidewalls of the helical groove parallel to the longitudinal axis, and a first portion of the thread body that is outside the helical groove has a height greater than a second portion of the thread body that is in the helical groove.

Abstract: A fistula treatment system comprises a guide such as a guide coil 1101 which is adapted to extend partially around a tissue tract and an implant element 1102. The implant element 1102 is activated to draw tissue surrounding the tract inwardly.

Abstract: An annular seal member 2 is formed by overlapping, in the axial direction D1, a plurality of ring-shape parts 3 which are closed or unclosed when viewed in a radial direction D2 orthogonal to the axial direction D1 of the annular seal member 2. A seal groove 5 has a groove bottom 51 with an outer diameter R51 that increases along the axial direction D1. The inner periphery 22 of the annular seal member 2 contacts the groove bottom 51, and the inner diameter R22 of the inner periphery 22 increases as the outer diameter R51 of the groove bottom 51 increases. By this means, the outer diameter R21 of the outer periphery 21 increases, and the side of the outer periphery 21 of the annular seal member 2 that has a smaller outer diameter R21 does not contact the inner peripheral wall 61 of an inner peripheral wall member 6, and the side of the outer periphery 21 of the annular seal member 2 that has a greater outer diameter R21 does contact the inner peripheral wall 61 of the inner peripheral wall member 6.

Abstract: A two-part mechanical fastener comprising an elongated body with a bore slidably carrying a mandrel adapted to interferingly engage the body is described. The fastener body has one or more protuberances on its exterior surface. In an aspect, the protuberances form a thread. The fastener is adapted to form an opening in, and penetrate, a stack of two or more workpieces. To secure the workpieces in the workpiece stack and form a robust joint, the fastener body is deformed by the mandrel, expanding the body, so that a body end engages a surface of the workpiece stack and the one or more protuberances are brought into engagement with the walls of the opening. Methods of using such a fastener to secure non-ferrous or polymer-based sheet-like workpieces to one another are disclosed.

Abstract: A fastener kit can securely affix a washing machine on a lightweight wall. The washing machine includes a rear panel for coupling to the wall through the fastener kit. A tub configured to contain washing water may be integrally formed with the rear panel. The fastener kit has one end section equipped with a sleeve that can radially expand to form tight contact with the inner surface of a fastening hole on the lightweight wall. The other end section of the fastener kit is coupled to the rear panel. The lightweight wall may be porous with regular or irregular cavities.

Abstract: An expandable fixing device contains: a first screw and a second screw. The first screw includes a first head portion and a first extension extending downwardly from the first head portion, the first extension has first threads formed on the first head portion, the first screw further includes a screwing orifice defined in the first head portion and multiple slots formed on the first extension, and the first extension has multiple expansion portions formed on a distal end thereof and intersecting with the multiple slots. The second screw includes a second head portion and a second extension extending downwardly from the second head portion, and the second extension has second threads formed on an outer wall thereof, wherein the second extension has a strike stem and inserting into the screwing orifice via the first screw and pushes the multiple expansion portions to expand outwardly.

Abstract: A self-locking screw with a raised root is provided. The self-locking screw has a head, a distal end, and a shaft extending between the head and the distal end. The shaft includes a thread with a plurality of turns so as to define a root, the raised root extending over the root for at least a subset of the plurality of turns proximal to the head. The raised root is removably attached to the root and detaches from the root when the self-locking screw is screwed into a substrate such that the detached raised root binds between the self-locking screw and the substrate and/or becomes embedded within the substrate.

Abstract: A rivet module is provided to join at least two sheets of base materials in a solid state, the rivet module including: i) a shank portion to be mounted on a reciprocal and rotatable joining tool; ii) a base material friction portion that is integrally connected to the shank portion and drills through the base materials as the joining tool causes the base material friction portion to be rotated while applying pressure to the base materials; and iii) a base material fastening portion that is fixedly fitted to the shank portion, supports the base material friction portion, and is fastened to the base materials through a thread formed on the outer peripheral surface thereof.

Abstract: An anchoring sleeve for anchoring a fastening element in a bore hole of a component by a hardenable compound is disclosed. The anchoring sleeve has a sleeve-like base body with a first end, with a second end, as well as with several axially successive extension sections arranged between the ends which are each configured to be cone-like and their diameter respectively increases in the direction of the first end.

Abstract: The disclosure provides examples of an open architecture anchor for securing soft tissue to bone, for example, to repair a torn rotor cuff. The anchor includes a helical screw thread having a base and two sidewalls that are non-linear. The non-linear sidewalls extend from opposing ends of the base and meet at a peak. The non-linear sidewalls are circumscribed within a triangle defined by the peak and ends of the base. Compared to the standard triangle profile, the helical screw thread profile has a smaller cross-sectional surface area and, consequently, removes less bone. The helical screw thread having the reduced cross-sectional area preserves bone stock and enhances the holding strength of the anchor in bone.

Abstract: An anchoring assembly and method adapted to secure a screw fastener at a pre-drilled hole in a concrete, brick or masonry building material with an elongated engagement cavity between the screw and the pre-drilled hole radially offset to one side of and extending axially along the depth of the hole, an elongated anchor strip axially adjacent the screw including an elongated malleable and non-resilient anchor member adapted to frictionally engage both the helical threads and the building material and to frictionally engage the threads to the building material radially opposite to the engagement cavity, the malleable anchor member having at least one transverse dimension which is substantially greater than the transverse radial dimension of the axial engagement cavity.

Abstract: A fastening apparatus is provided to secure a first component to a second component. The fastening apparatus includes a fastening anchor and a securing member. The fastening anchor includes two separated securing parts defining internal screw thread and external screw thread. The securing member defines external screw thread. The securing member is accommodated into the fastening anchor by the securing member external screw thread engaging the fastening anchor internal screw thread, and the two separated securing parts of the fastening anchor is urged to expand outward to engage with one of the first component and the second component.

Abstract: A reusable expansion anchoring assembly comprises a spiral tang and a bolt. The spiral tang is formed by spirally coiling a long wire, and the bolt includes a head and a body. A spiral part is provided on the body to form a plurality of threads spaced equidistantly and the threads at the bottom of the body are in tapered shape. In the setting process, the first thread is assembled with a gap of the spiral tang, and the bolt body and the spiral tang are inserted into a round and elongated hole provided in an object with substantial depth. Turning the bolt head bolt produces sufficient force to assemble the first thread with the spiral tang. Under normal or improper operation, the spiral tang is movable relative to the bolt and can be expanded, and a firm connection between the bolt and the object can be formed.

Abstract: A joining assembly for joining a pair of structural members, comprises a bolt having a thread and a nut-like blind rivet adapted to be inserted into mounting holes of the structural members and to be threadingly engaged to each other. One of the mounting holes is made of resiliently deformable material and comprises a base member including a bore for receiving the thread of the bolt and having an outside provided with a plurality of threads which are similar in number to the corners of the polygonal mounting hole, such that when the bolt is threadingly engaged into the bore of the blind rivet the base member is folded whereby the threads have parts of their flanks pressed against one of the structural members.

Abstract: The shaft is connected to the shaft attachment by a thread. A bore with an internal thread is incorporated in the shaft attachment and the shaft has a corresponding stem which can be introduced into the threaded bore and has an external thread. An axial stop is arranged on the shaft and on the shaft attachment. The internal and external threads have torque-transmitting flanks which are flat toward the axis and which can be connected to one another frictionally by radial pressure by mutual rotation of shaft and shaft attachment with interaction between the axial stops. Owing to the small angle between the load-bearing flanks and the axis, the radial pressure decisive for the torque transmission is correspondingly greater than in conventional threaded connections. As a result, the axial prestressing force between the two parts to be connected can be correspondingly reduced.

Abstract: A mounting system for luminaire assemblies includes a mounting fixture which can be inserted into a tubular pole and secured therein without the need for complicated fasteners or tools. Specifically, the mounting fixture includes a cylindrical fitting with a tapered threaded section in which the depth of the groove forming the threads decreases upwardly along the fitting. A generally circular wire clip is seated within the tapered groove and upon rotation of the fitting relative to the tubular pole an end or detent of the clip engages the inner surface of the pole thereby prevent rotation of the clip. Continued rotation of the fitting relative to the pole advances the clip upwardly in the threaded section toward the more shallow portions of the groove thereby forming a friction fit between the expanding clip, the mounting fixture and the pole.

Abstract: An assembly for inserting an attachment coil in concrete with a screw having a releasable spacer and an expandable coil mounted thereon. The spacer initially positions the screw in a hole for location of the coil and has a slot to permit the spacer to pop off the screw as the screw is screwed into the coil in the hole. The spacer may have longitudinal ribs to bridge any lateral space between the screw and the hole. The coil has an exterior diameter less than the interior diameter of the hole for free movement of unexpanded loops without creating cross threading during insertion. A second coil can be inserted closer to the surface by assembling two spacers on a screw for location of the second coil, with both spacers popping off the screw as the screw advances into both coils. The use of two coils in a hole allows positioning of coils in both compression and tension zones on opposite sides of a neutral axis of the structure.

Abstract: A spiral member for improving the grip of screws in wooden or other receptive substrates is disclosed. The spiral member has a central axial drive pin by which it can be driven into a thread in the receptive substrate, and it has an improved cross section providing wings or protuberances extending out past the side surfaces of the cross section. The spiral member also has an outwardly facing triangular apex which bites into the old thread while the wings bear upon the flanks of the screw thread of the screw that inserted into the spiral member, thereby improving the grip.

Abstract: An anchoring assembly and method for securing a threaded elongate member such as a bolt or screw in a material engaging position in a preformed hole in a relatively frangible material. The anchoring assembly is formed of a threaded elongate member and coil surrounding and engaging at least some of the threads of the elongate member and extend beyond the outer transverse boundary of the elongate member. The elongate member is formed with a reduced diameter preferably tapered entry end, a threaded body portion, and preferably a headed head end. The coil is formed of a uniform cross-section wire having a diameter permitting the coil to seat on the threaded body portion of the elongate member. An anchoring tab or tang having a thickness less than the diameter of the wire forming the coil is formed on at least one end of the coil with a thickness preferably between 90% and 110% of half the difference in diameter between the maximum outer diameter of the elongate threaded member and the outer diameter of the coil.

Abstract: A fastener having a retaining member with a top portion and an elongated hub extending downwardly from the top portion. A helical groove extends throughout a substantial portion of the length of the hub and the upper end of the helical groove is formed to change the lead between the upper end of the helical groove and at least the uppermost loop of a helical coil mounted in the helical groove to create a tensile load on the hub by a helical coil having at least the uppermost loop located in the helical groove. A helical coil with a plurality of loops has at least the uppermost loop located in the helical groove in the hub, and the end portion of the uppermost loop contacts the portion of the groove formed to change the lead to create a tensile load on the hub to mount the helical coil on the hub.

Abstract: The present invention provides an expandable fastener assembly for use in materials which cannot be successfully fastened by conventional screw threads. The assembly includes an insert (20) constructed as a coil to expand uniformly along its convolutions and thereby exert a force upon the adjacent material (50). A fastener (30) has outer threads compatible with the inner threads of the insert (20) such that when a tightening or seating torque is applied to the fastener (30) it is transferred to the insert (20). The transferred force expands the insert (20) outwardly with respect to the fastener (30), without rotation of the insert (20) relative to rotation of the fastener (30). The invention is also provided with an anti-rotation feature to secure the fastener from rotational movement after installation.

Abstract: A method and a device for attaching a rail on a timber support. The device includes a helically threaded fastener adapted to be screwed into a helically threaded borehole in the support after a rectangular metal insert is positioned in a rectangular opening at the periphery of the borehole. The borehole is sufficiently large that the fastener only contacts the timber support via contact with the insert. The rectangular opening is longer than the insert so that there is radial play between the insert and one end of the insert. The other end of the insert is adapted to contact a sloped side of the thread of the fastener. As the fastener is screwed into the borehole, the sloped side of the fastener presses the insert parallel to and perpendicular to the screwing axis of the fastener. As a result, the insert elastically expands parallel to and perpendicular to the screwing axis. Because the expansion perpendicular to the screwing axis is less than the radial play, no radial forces act on the timber support.

Abstract: The disclosure herein includes an apparatus and method for positioning an anchoring device in the form of a coil in a pre-drilled hole for firmly engaging a lag screw or other member. The coil consists of a series of turns and may be made of steel or plastic or combination thereof which, in use circumferentially expands in the wall of the hole and helically elongates toward the bottom of the hole. The lag members used herewith can be removed and reinserted into the embedded coil as required. Depth indicating means is placed on the setting apparatus such as a lag screw or other tool so the anchor device or coil can be positioned to a precise depth. The anchor device or coil may be formed of a suitable diameter metallic wire or may be molded or die cast from a metal or plastic material.

Abstract: An improved concrete anchor consists of an expansion nut in the form of a cylindrical coil of a resilient material and a bolt provided with a thread adapted to receive the coil. The thread of the bolt has two sections of different effective minor diameters. A first section immediately adjacent the threaded end of the bolt has a minor diameter sufficiently small to permit the bolt to enter the coil without causing any distortion or enlargement in the outer diameter of the coil. Adjacent the first threaded section and extending toward the head of the bolt is a second section having a larger minor diameter which causes expansion of the coil on engagement therewith. The end of the coil facing away from the head of the bolt is provided with a short, straight tab portion which extends in a direction generally away from the head of the bolt while tapering inwardly toward the axis thereof.