Abstract: A threaded fastener for securing a first material to a support member is provided comprising a tapping or tap screw point at a first end, a threaded shank with three separate leads, a first portion of the shank, adjacent to the tap screw point, being of a trilobular thread design, a second portion of the shank, distal from the tap screw point, being unthreaded, and a head at an end opposite the tap screw point having an enlarged diameter and a countersunk shape to reduce the likelihood of pull through of the fastener through said first material, yet to allow the head to be introduced flush with a surface of the first material.

Abstract: A skull pin has a ceramic insulating portion between a titanium driving portion and a titanium tip portion. The driving portion of the skull pin terminates in a sleeve, and the ceramic insulator with a solid cylindrical shape is received such as with a press fit in the sleeve. The preferred ceramic material is zirconia. The tip portion has an opposing outer sleeve which receives the distal end of the ceramic insulator such as with a press fit. The ceramic insulator is believed to reduce or eliminate a burning sensation felt by patients during Magnetic Resonance Imaging (MRI), which may be caused by transmission of high (radio) frequency electrical signals through the prior art skull pins.

Abstract: The present invention envisions a fastener and a blank for forming a fastener. Threads are formed on the fastener blank of the present invention to achieve the fastener of the present invention. The fastener and blank include a shank which defines a central axis of the fastener. A head is provided on one end of the shank and a leading end is provided on an opposite end of the shank distal the head. A plurality of lobes are provided on the shank and are generally axially aligned with the central axis. Flutes are defined between neighboring lobes. The plurality of lobes include at least three major lobes and three minor lobes. The major lobes are defined by a major arc which is struck by a major radius. The minor lobes are defined by a minor arc struck by a minor radius. The major and minor radii extend from different radial points of origin.

Abstract: A connector assembly is provided. The connector assembly is particularly well adapted for connection of a tube top flange to a tube sheet, in a bag house or filter assembly. The connector assembly includes a bolt having a retainer construction or skirt thereon, to retain the bolt in place. The bolt has shank sections of different cross-sectional size, to advantage.

Abstract: A fastener is constructed having four thread zones constructed over the length of the fastener, from the head to the tip, namely a ridged cylindrical holding zone, a ridged cylindrical transition thread forming zone, a rectilobular tapered thread forming zone, and a rectilobular alignment zone. The pitch cross section of the thread varies in each zone.

Abstract: A self perforating (punching) and thread forming connecting element such as a screw having a screw shaft 2 and screw tip 6 which tapers to a pointed end 4 as well as a single or multiple thread 8 which extends at least partially along the screw shaft 2 and along the screw tip 6 to the pointed end 4. This screw tip 6 has an essentially polygonal cross section along at least a partial region of its axial length and the thread 8 is constructed as a radially raised portion which has a helical shape with an outer thread edge 8a which, when viewed in an axial projection, forms a spiral in the region of the screw tip 6 as the radius of the thread becomes smaller and in the region of the screw shaft 2, the outer thread edge 8a proceeds with a constant radius in the form of a circle.

Abstract: A pilot screw has a head, a shank beneath the head, a tapered tip at the end of the shank, and a spiral thread surrounding the shank. A large number of spaced auxiliary threads are disposed on the tapered portion of the head. A large number of spaced secondary threads are disposed on the shank between the pitches, and plural cutting gaps are formed at the end area of the spiral thread.

Abstract: A connection between a metallic threaded fastener having a threaded portion and a part of plastic material having a bore, the threaded portion forming or tapping a counter thread into the wall of the bore, characterized in that for a predetermined number of threads, the entrance portion of the bore is provided with a circular shaped or arc shaped inclined cam surface which encircles the bore helically and which forms a step between the ends of the cam surface or the associated ends of adjacent cam surfaces, respectively.

Abstract: A drive screw comprises: a head portion; a shank; and a helical thread portion extending along almost all the length of the shank, wherein an outside diameter of the drive screw including the thread portion being formed so as to be reduced from a portion close to the head portion in at least three stages.

Abstract: A self-drilling and thread-forming screw comprises a threaded shank, a drilling section arranged in front of the shank and having a uniform diameter, and a thread-free flow-forming section widening conically between the drilling section and the shank. The drilling section has two chip grooves which run diametrically opposite one another, are bounded by flute edges and cutting edges, and end in a drilling tip with the cutting edges running together at the tip. The diameter formed by the cutting edges is smaller than a minor diameter of the threaded shank, and the largest diameter of the flow-forming section corresponds to the minor diameter of the shank and includes a symmetrical polygonal cross-section with rounded-off corners in a region adjoining the shank.

Abstract: A self-tapping screw has a thread shaft having a leading end, a wood screw thread provided on the thread shaft and having a plurality of turns, and milling profiles formed on the turns of the wood screw thread and spaced from one another in an axial direction, the milling profiles becoming smaller the further away the milling profiles are from the leading end, some thread turns at a head end of the thread shaft being free of milling profiles.

Abstract: The present invention supplies a drilling screw which can fix a gypsum board to a thin steel plate by utilizing an impact-type air driven screw fastener and execution method for fixing efficiently the gypsum board to the thin steel plate. The drilling screw 11 comprising the parallel thread part 13 and the smaller diameter parallel thread part 15 which are connected through the taper thread part 14. The height of thread crest of the smaller diameter parallel thread part 15 is as small as about 0.1 mm. The taper bit 16 is formed at the fore end of the smaller diameter parallel thread part 15. When the drilling screw 11 is hammered into the gypsum board and the C-type steel plate structural material with the impact-type air driven screw fastener, the smaller diameter parallel thread part 15 is inserted through the steel plate. Since the smaller diameter parallel thread part 15 has so small diameter, the steel plate is seldom deformed.

Abstract: A connector assembly is provided. The connector assembly is particularly well adapted for connection of a tube top flange to a tube sheet, in a bag house or filter assembly. The connector assembly includes a bolt having a retainer construction or skirt thereon, to retain the bolt in place. The bolt has shank sections of different cross-sectional size, to advantage.

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: The present invention pertains to a thread-forming joining element, in particular, a screw, which comprises a single or multiple thread that extends over at least part of the screw shaft (1), a screw tip (3) and a screw head (2). The thread extends to the point of the screw tip (3), with at least one friction edge region (11) extending over at least part of the length of the screw tip (3) in the longitudinal direction of the screw, namely on the circumferential surface in the region of the screw head (3).

Abstract: A self-tapping, screw-type anchor capable of being turned into a hole drilled in masonry whose hardness renders the wall of the hole highly resistant to a tapping action. The anchor includes a thread forming a helical ridge on the root of the anchor, the thread having a profile defining a pair of opposing curvilinear flanks rising above the root and converging toward a crest. The curvature of the flanks which is preferably hyperbolic, creates a crest having a small included angle adapted to penetrate the wall of the hole, the crest being supported on a relatively broad base that merges with the root to firmly secure the thread thereto and thereby prevent deformation or mutilation of the thread as the anchor is being turned into the hole.

Abstract: A screw or tap for forming or cutting threads in a workpiece. The screw includes a cylindrical shank directed along a longitudinal axis. The shank includes a work holding portion having a plurality of helical threads of a constant crest diameter, a constant root diameter, a constant pitch diameter, and circular cross-section. The shank also has a lead portion having at least a portion of a helical thread. Intermediate the work holding portion and the lead portion is a forming portion. The forming portion has at least one full thread located thereon having a crest diameter which is greater than the crest diameter of the plurality of helical threads on the holding portion, a root diameter which is larger than the root diameter of the plurality of helical threads on the holding portion, and a pitch diameter which is proportionally greater than the pitch diameter of the holding portion.

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 new cutting tip and a very simple method for making the tip are given. The tip has no flutes but has a built-in chip clearance. It is self-drilling, self-tapping, and self-locating and can be positioned on a threaded or unthreaded member. When it is the tip on a suture anchor, it maximizes holding strength of the anchor.

Abstract: A standard size fastener, such as a nail or screw, is provided with a pointed PVC or similar type material on the fastener tip. The soft end will penetrate wood but not metal materials, such as copper pipe and electrical conduit, when nailing sheathing or sheet rock onto wood framing. The soft front end will squash on impact with metal leaving a rounded blunt shape that will turn or stop when contacting a pipe.

Abstract: A tapping screw engages a member to be engaged with a base plate made of metal by tapping a burring hole formed on the base plate. The tapping screw includes a main body having a shank and a head formed at a base end of the shank. A reduced diameter shank portion extends from a fore end portion of the shank of the main body, and has a taper angle .theta. of 9.degree. to 14.degree. and a substantially rounded triangle shaped cross-section. Recesses having no thread are formed at three faces of the reduced diameter shank portion so that a circumferential width of each recess is gradually reduced toward a tip end of the reduced diameter shank portion. Each recess is formed by a steep face facing a screwing direction of the tapping screw and a gentle face oppositely facing the steep face to form a groove.

Abstract: An improvement of an output shaft of a booster is disclosed. An output shaft 23 is formed by a push rod 24 and an adjusting screw 25. The push rod 24 is formed with an axial bore 26 in its distal end, the axial bore including a portion 26b of a reduced diameter which is less than an outer diameter of a threaded section 25C of the adjusting screw. The threaded portion is formed as a self-tapping screw. The adjusting screw includes a guide 25D at a location which is initially inserted into the axial bore before the threaded portion is inserted into the threaded portion. The guide comprises a plurality of annular projections 27 having an outer diameter which is substantially equal to the inner diameter of the axial bore. With this construction, when the guide 25D is fitted into the portion 26b of the axial bore 26 which has a reduced diameter, the axis of the adjusting screw 25 may be brought into alignment with the axis of the push rode 24.

Abstract: A threaded rod is fitted to a plug-in assembly which can be inserted into a mounting rack, which threaded rod is aligned in the insertion direction and becomes operatively connected to a motor-driven threaded nut during insertion. The first thread pitches are designed such that the rod and nut latch on one another.

Abstract: A self-aligning, anti-cross threading fastener having a first member 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 a second 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: An anchoring element (1) for supporting prostheses or part thereof. The anchoring element (1) is substantially rotationally symmetrical and provided with external threads (20) and a central bore (2). At least one slit (3, 4, 5, 6) is arranged in spiral form around the longitudinal axis (13) of the element (1) and extends over at least the major part (11, 12) of the outer wall of the element. The major part is provided with external threads (20), the chirality of the slit (3, 4, 5, 6) being the same as that of the outer threads (20).

Abstract: A traction stud for an endless snowmobile belt including an elongate rod having a ground engagable end and a threaded end which can be coupled to the track with a threaded fastener. A slot is cut into the threaded portion of the track such that the terminal end threaded portion is separated from the remaining threaded portion by a gap but coupled thereto via a reduced stem which, after installation, can be broken away so that the remaining portion of the stud shank is flush with the fastener. The invention also contemplates the method of making the stud and the method of installing the stud with a transverse slot providing a weakened break away portion which can be severed by the application of transverse force to remove the axially inner terminal end of the stud.

Abstract: A fastener assembly having a receptacle attached to the underside of a substructure and extending through a hole within the substructure which are both generally aligned with a panel with a hole adapted to receive a threaded bolt. The hole in the panel has a cylindrical portion. The fastener extends through the panel which is being secured to the substructure and enters the receptacle before engaging a threaded section within the receptacle. The dimensions are sized so that the central section of the fastener engages the central section of the receptacle before the tapered section of the fastener contacts the cylindrical portion of the hole in the panel. Continued rotation of the fastener causes the tapered section on the fastener to enter the cylindrical portion of the hole in the panel, exerting a lateral force on the panel to align the hole in the panel with the bore in the receptacle.

Abstract: A thread forming screw for concrete, masonry, rock, or similar material. The size ratios of various portions of the screw are defined to reduce thread engagement which, in turn, reduces screw-in torque. A burr in the screw's thread includes bow-shaped cutting teeth to facilitate screw-in.

Abstract: A fastener has a head and a shank with two ends. One of the ends includes the head while the other includes a pilot point. Also, the shank includes a threaded portion adjacent to the pilot point. A pair of recesses are formed 180.degree. from one another on the point and threaded portion. The recesses extend from the end of the point through at least a first full thread.

Abstract: An externally threaded male fastener has a right circular cylinder at one end that is slidably engageable with the internal threads of a female element, a pair diametrically opposed circumferentially truncated approach thread portions between the right circular cylinder and its conventional threads, and a pair of diametrically opposed unthreaded portions between the approach thread portions that preclude cross-threading with an internally threaded female element.

Abstract: An improved railroad frog bolt-nut assembly is disclosed. The bolt has a square head and a shank. The shank has an unthreaded portion adjacent the head and a threaded portion at its terminal end. The threaded portion is rolled to a diameter equal to the shank's unthreaded portion to produce high fastener strength. A unitary lock nut is formed with an annular boss extending from its outside end in which indentations intersecting with some of the nut threads are pressed to provide an interference, locking fit with the bolt threads.

Abstract: A self-tapping screw fastener includes a shank having first and second ends and a head disposed at the second end of the shank. The shank has a tapered portion of a predetermined axial length adjacent the first end, and the tapered portion terminates at the first end in a substantially circular end surface having a first diameter. The shank also has a substantially cylindrical portion having a second diameter extending from the second end to the tapered portion. A thread extends helically along a circumferential outer surface of the shank from a location near the head substantially to the first end such that the thread at least partially covers the cylindrical and tapered portions of the shank. The ratio of the axial length of the tapered portion to the diameter of the end surface exceeds substantially 1.5, and the diameter of the end surface is less than but substantially equal to the diameter of the cylindrical portion of the shank.

Abstract: A reduced-friction screw is described. The screw requires less turning torque than a conventional screw to drive it into a workpiece. The shaft of the screw has a reduced-thickness thread that produces less sliding friction than a conventional screw having thread of the same depth and pitch. In addition, the holding ability of the reduced-friction screw is substantially the same as a conventional screw having thread of the same pitch and depth. Another embodiment contains a shaft having a reduced diameter, to further reduce sliding friction. Yet another embodiment contains a segmented, reduced-thickness thread that resists removal and loosening when the workpiece is subject to twisting, vibration, or warping. To prevent loosening of the reduced-friction screw, the bottom of the screw head may contain protrusions to increase the frictional contact of the head with the workpiece.

Abstract: A threaded bush having a cylindrical body provided with a female thread in an inner surface, a male thread in an outer surface, a plurality of triangular recessed stop grooves spaced equally in a lower sloping-down portion, each stop recessed groove formed with a vertical side wall and a curved side wall defining a small angle, the curved side wills guiding and cutting in a wall of a hole which this bush is to be screwed in, the vertical side wall cutting positively the wall of the hole, the triangular recessed stop grooves engaging uncut wall material of the hole to prevent this bush from loosening out of the hole.

Abstract: An apparatus is disclosed for joining structural units. A structural unit, such as a precast concrete section of pipe, decking, bridge structure, building structure, or pavement, includes a plurality of spaced, longitudinally aligned tubular members. The ends of each structural unit are flush, and the ends of the tubular members are flush with the ends of the structural units. When two of such units are to be joined together, a guide member is inserted in one end of each of the first tubular members in the first structural unit, while an internally threaded insert member is inserted into a corresponding end of each tubular member in the second structural unit. The guide members and insert members have axial apertures with the aperture in the insert member being internally threaded. The two structural units are brought together so that each guide member on the first structural unit enters into the corresponding end of the tubular members containing the inserts in the second structural unit.

Abstract: A drill screw of the type suitable for fastening a sheet or plate to a lightweight steel frame member comprises a head portion, a threaded portion adjacent the head portion, a drill shaft portion adjacent the threaded portion, a large diameter drill portion adjacent the drill shaft portion, and a small diameter drill portion adjacent the large diameter drill portion. The small diameter drill portion has a smaller drill angle than the large diameter drill portion thus providing improved bite so that less thrusting force is required and the tendency to skid and drift is reduced.

Abstract: A fastener has a head and a shank with two ends. One of the ends includes the head while the other includes a dog tip point. Also, the shank includes a threaded portion adjacent to the dog tip point. A pair of recesses are formed 180.degree. from one another flush with the point and on the threaded portion. The recesses are continuous with the point and extend through at least a first full thread.

Abstract: A threaded fastener has an eccentric tip with a smooth portion, a threaded portion and a cleaning recess formed into the threaded portion of the tip. The recess and tip are formed in the heading operation prior to rolling the threads onto the shank which provides better thread quality.

Abstract: An improved railroad frog bolt-nut assembly is disclosed. The bolt has a square head and a shank. The shank has an unthreaded portion adjacent the head and a threaded portion at its terminal end. The threaded portion is rolled to a diameter equal to the shank's unthreaded portion to produce high fastener strength. A unitary lock nut is formed with an annular boss extending from it's outside end in which indentations intersecting with some of the nut threads are pressed to provide an interference, locking fit with the bolt threads.

Abstract: A pallet that is initially not completely aligned with a support structure, such as support rails in the floor of an aircraft, is properly aligned by the function of an aligning and coupling device which has two sections interconnected by a coupling member, such as a screw bolt that can be tightened. One section is connected to the support and the other section is connected to the pallet. Relative movement at least in a radial direction of the components of one section permit an adjustment. The relative movement is preferably permitted in the radial and axial direction. The continued tightening of the two sections to each other provide the required alignment.

Abstract: A thread-forming screw includes a tapered end portion having a tri-roundular cross section with three spaced flats and three threaded, round portions disposed in an alternating manner about the screw's periphery. The screw is formed by inserting a tapered blank between paired dies each having threads provided with undulations along their lengths corresponding to the circumference of the screw blank so as to form a trilobular thread on the screw which spirals around its circumference from one end of the cylindrical, untapered portion of the screw to the other in a direction opposite to that of the threads. While the untapered portion of the screw is provided with fully crested threads, the tapered end portion includes partially formed, or somewhat flattened, threads. The three spaced flats on the tapered end of the screw provide relief from contact with the workpiece into which the screw is driven for receiving deformed portions of the workpiece as the screw is driven into a workpiece aperture.

Abstract: A bow sight mount includes a mounting plate, a sliding bar and a lock. The bar is adapted at one of its ends to be fixed to the bow sight and the plate is adapted to be permanently fastened to the lock. At least one threaded aperture extends transversely through the bar. The plate, which has a channel extending through its length contoured to snugly, reciprocally, slidably receive the bar, has a smooth locking aperture of diameter less than the threaded aperture in the bar and positioned so as to be alignable with the threaded aperture as the bar slides in the channel. A frusto-conical sink extends into and is aligned with the locking aperture. The lock includes a knob with a threaded shaft rotationally engagable in the threaded aperture. The end of the shaft has a frusto-conical taper to complement the frusto-conical sink in the plate and a cylindrical tip snugly insertable into the locking aperture.

Abstract: A concrete anchoring bolt apparatus for anchoring a plate member or the like to a concrete surface includes a stake member having a nut-supporting open end having a nut secured therein. A threaded bolt member is threadedly attached to the nut secured in the stake member and has a concrete and bedding sleeve over the threaded bolt member. Washers are placed on both sides of the embedded sleeve and an anchoring nut is attached to the threaded bolt member over the embedding sleeve. The stake member has a pointed end so that positioning the stake member in the soil before a concrete pour and pouring the concrete thereover anchors the stake and sleeve in the concrete so that the threaded bolt member can be adjusted through the embedding sleeve into the stake member and an anchoring nut and washer can attach a plate member or the like to the surface of the concrete.

Abstract: A radial extrusion thread-forming screw (20) comprises a lead thread (36), load-bearing threads (34), and a forming thread (38). The forming thread (38) has a plurality of forming elements (50) that extend outwardly from the forming thread and which are spaced substantially circumferentially equidistant from each other. The forming thread (38) is tapered about its circumference such that the first forming element (50) moves the greatest amount of material and subsequent forming elements (50) move successively less such that each of the forming elements require substantially the same deformation force to move through the workpiece. The forming elements (50) are of a geometry which promotes deformation along slip planes in the material of the workpiece. The lead thread (36) and the load-bearing threads (34) do not have any forming elements (50) located thereon.

Abstract: A fastener has a head and a shank with two ends. One of the ends includes the head while the other includes a pilot point. Also, the shank includes a threaded portion adjacent to the pilot point. A pair of recesses are formed 180.degree. from one another on the point and threaded portion. The recesses extend from the end of the point through at least a first full thread.

Abstract: A fastener includes an annular body having a screw thread spiraling therearound. The thread has a crest and a pair of front and back flanks extending laterally therefrom, with a start end disposed adjacent to a front end of the body. The start end is flat from the back flank to the front flank and is inclined at an acute back angle relative to a helical axis of the crest for facing the start end toward a back end of the body.

Abstract: A U-nut in which a pair of axially aligned collars are formed on the opposed plate members of the nut with one of the collars having internal threads for accommodating a bolt and the other of the collars is provided with a reversely bent radially inwardly extending circular projection which serves as a locator for properly locating the nut relative to hole formed in a support panel.

Abstract: This invention relates to a bolt having a tapered tip comprising of corresponding opposite flat and partially threaded portions that engage an oval nut having elongated internal adjacent sides, the ends of which are void of threads to enable bolt/nut alignment when initially inserted and tightened. Additionally, the tapered threaded bolt has an arcuate shaped or rounded first and/or second thread for providing self-alignment and preventing gouging or digging of internal threads when being inserted or screwed into any conventional nut or oval shaped nut. Moreover, inadvertent contact between the bolt and nut while in the process of initial insertion will not preclude uninhibited correct bolt insertion into the nut.

Abstract: A self-tapping screw has a cutting thread formed by two separate threads (3, 4). An imaginary envelope (5) defines a annular space (5) laterally enclosing the screw shank and has a section (5a) tapering inwardly along an inwardly tapering leading end section (1a) of the shank (1). The inwardly tapering section of the annular enclosing space an envelope forms an angle (B) considerably larger than the angle (A) formed by the tapering leading end section (1a) of the shank. The leading ends (3a, 4a) of the separate threads (3, 4) are located diametrically opposite one another for uniform distribution of the forces developed when the screw penetrates into a hard receiving material, such as concrete, masonry, gas concrete and the like.

Abstract: A masonry screw anchor having two different constant diameter shank portions connected via a taper. Each portion has a set of constant diameter threads and intermediate smaller diameter protrusions with the threads and protrusions on the larger diameter shank portion being larger in diameter than the diameter of the threads and protrusions on the smaller diameter portion.