Abstract: An object of the invention is to obtain dislocation preventing means which has a simple structure and reliably prevents dislocation from concrete, and cause a deck plate to correspond to a resistance cross section with respect to all dead/live loads over the entire length of a bridge beam. A dislocation preventing bolt 9 has a threaded section 91, having an external thread formed thereon, a tapered section 92, which is formed continuously from the threaded section, and a circular cylindrical section 93, which is formed continuously from the tapered section. A longitudinal rib composite floor slab 100 includes a main girder 1, a transverse girder 2 joined to the main girder 1, a deck plate 4 whose lower surface side is joined to the main girder 1 and the transverse girder 2, a longitudinal rib joined to the upper surface of the deck plate 4, concrete 7 placed on the upper surface of the deck plate 4, and pavement 5 placed on the upper surface of the concrete 7.

Abstract: A fastener element (16) has a head section (18), a threaded shank section (17) with threads (20) at a pitch and a distal end section (22). A retention device (24) is secured to the distal end section and is engageable with a fastener receiving member (14).

Abstract: The present invention utilises impact-driven fastener (1) having a twisted body having: a common axial core (2) a protruding helix (3) and a trailing elongate lost-end driving shank: (4) of reduced radial diameter. The fastener incorporates two or three loosely wound loosely wound thread-cutting blade-like helical projections (5) extending radially from a solid axial core (2). These blade-like projections (5) are inclined upon a sweeping helical angle (8) of less than 42° to the longitudinal axis (9) of the core (2).

Abstract: A single pole cable connector includes a tamper-resistant locking system. The locking system includes a locking disk and a corresponding unlocking tool for removing the locking disk from the connector to provide access to the locking mechanism. Single pole cable connector systems include male and female single pole cable connectors in mating engagement. Disengagement of the male and female connectors involves removing the locking disk using the unlocking tool to access and release the locking mechanism.

Abstract: A fastener includes a driven head and a shank portion. The driven head has a top end, a bottom end, a plurality of flat guide surfaces connected between the top and bottom ends, a plurality of angularly spaced-apart rounded driven lobes each connected between two adjacent flat guide surfaces, and a flanged abutment section projecting outwardly and radially from the bottom end. Each flat guide surface is indented between two adjacent rounded driven lobes. The shank portion is connected to the driven head, and has a thread extending helically around an outer periphery of the shank portion.

Abstract: A thread-tapping screw (11) has a thread (21) extending, starting from the screw shaft free end (15), at least along a portion of the shaft length and a height of which constantly decreasing toward the free end (15) of the shaft (12), and a plurality of cutting bodies (26, 36, 46, 56, 66) formed of a material having a greater hardness than hardness of the thread (21), located in recesses (24) formed in the thread (21) and opening radially outwardly and having, respectively, a radial outer profile (27, 37, 47, 57, 67) projecting, at least partially, beyond the thread and a height (A, B, C, D, E) of which decreases toward the free end (15) of the shaft (12) stepwise.

Abstract: A fastener is provided including a bolt. The bolt has a head and a threaded shank extending from the head. The threaded shank is dimensioned to co-operate with a predetermined threaded bore, with the free end of the shank remote from the head being provided with an end cap and the end cap having a yieldable formation to engage frictionally with the threaded bore.

Abstract: The present invention pertains to a higher fastening screw comprising a plurality of concavities formed on the threads, which are connected in sequence for being presented as a state of a single helix. Further, the concavities separately located adjacent to the screw head and to the drilling portion are disposed at relative positions for being accurately aligned by an imaginary line. In this manner, the configuration of the concavities would efficiently cut and sever the fibers of the object, so as to achieve a lower screwing resistance for a higher screwing efficiency and prevent the injuries to the operators.

Abstract: A screw (11) includes at least one thread (21) arranged on the screw shaft (12); circumferentially surrounding the shaft (12) at least in some regions, and having a thread pilot (22) located in the free region (15) of the shaft (12) and a plurality of recesses (31) provided in the thread (21) and opening radially outwardly, with the recesses (31) each having a first limiting wall (32) adjacent to the thread pilot (22) and a second limiting wall (33) remote from the thread pilot (22), and a plurality of cutting bodies (26) formed of a material having a hardness greater than a hardness of the thread, located in the recesses (31) formed in the thread (21) and having each a longitudinal axis (27) and an outer surface (28) surrounding the axis (27) at a distance therefrom, with the recesses (31) each having a flat bearing section (34) with a plurality of generatices extending substantially along a course of the thread (21) for receiving, at least in some regions, the outer surface (28) of a respective cutting body

Abstract: A screw (11) has a shaft (12), a thread (13) which is arranged in at least some areas over the circumference of the shaft (12) and which defines a helix (14), and cutting bodies (26; 36; 46; 56, 66) made of a material having hardness greater than the hardness of the thread (13) and arranged in recesses (20, 21) of the thread (13), with the cutting bodies (26; 36; 46; 56, 66) having their longitudinal extension oriented along the helix (14) so that their longitudinal axes (27; 37; 47; 57, 67) enclose an angle (A; B; C; D, E) of ?35° to +35° with the respective tangents of the helix (14).

Abstract: A fastening element has a shaft (12), and a tapping thread (21) carried by the shaft (12) and having at least one screw thread (22, 42) a section (23; 43) of which that adjoins the thread pilot (35), having a plurality of following one another thread steps (24, 25, 26, 27; 44, 45, 46, 47) having different cross-sections, with a cross-section of the at least one screw thread (22; 42) decreasing stepwise toward the thread pilot (35) from a thread step (24, 25, 26, 27; 44, 45, 46, 47) to a thread step (24, 25, 26, 27; 44, 45, 46, 47), with the thread steps (24, 25, 26, 27; 44, 45, 46, 47) having respective cutting edge-forming end surfaces (28, 29, 30, 31; 48, 49, 50, 51) aligned, at least partially, in a direction of the thread pilot (35).

Abstract: In a bolt of the present invention, a guide portion (116) having a small diameter is formed at the distal end of a shaft portion (15) and ridge (31) having an inverted direction screw configuration relative to the ridge (30) formed on a constant diameter portion (115) is formed. When the bolt (1) is inserted obliquely into a nut (100) and the ridge (31) gets into engagement with a female screw portion (105) of the nut (100), an effect of floating the bolt (1) is generated, and the bolt 1 cannot be driven into the nut 100 unless it is set in an appropriate tightening posture. Consequently, biting and seizing of the bolt 1 to the nut can be prevented securely. If the ridge (31) is formed into a double threaded screw having an inverted direction screw configuration, the effect can be further intensified.

Abstract: It is possible to prevent a screwing torque from becoming excessively high even when a screw is threadedly engaged into a deep guide hole. In a tapping screw 100 comprising a parallel screw 22, a taper thread 23 provided closer to a tip end of the tapping screw than the parallel screw 22, and a plurality of projections 30 which partially project along an apex and flanks on both sides of a screw thread and which form an internal thread on a surface of a guide hole formed in a to-be fastened member, the plurality of projections 30 are provided from a region where the taper thread 23 is provided to a portion of a region where the parallel screw 22 is provided, and a diameter of a virtual cylinder which comes into contact with tip ends of some of the projections 30 including a projection provided in a region where the parallel screw 22 is provided is larger than an outer diameter of a external thread of the parallel screw 22.

Abstract: In order to improve the holding force of a self-tapping concrete screw (1) in a hole (2) drilled in concrete (3), the invention proposes formation of the concrete screw (1) with two threads (8, 9) having different external diameters (d1, d2), the spacing (p1) of the thread (8) which has the smaller external diameter (d1) to the thread (9) which has the larger external diameter (d2) when seen from the front end (5) of the screw being smaller than the spacing (p2) of the thread (9) having the larger external diameter to the thread (8) having the smaller external diameter. The threads (8, 9) are preferably sawtooth threads.

Abstract: A pin with threads that extend along a portion of a stem of the pin interact with framing members as the pin pierces and is axially driven through the framing members. The interaction of the threads with the framing members cause the pin to rotate as the threads pass through the framing members and fastens the framing members together.

Abstract: A fastener element (16) has a head section (18), a threaded shank section (17) with threads (20) at a pitch and a distal end section (22). A retention device (24) is secured to the distal end section and is engageable with a fastener receiving member (14).

Abstract: A method facilitates assembling a gas turbine engine assembly including at least a first member and a second member. The method comprises inserting a threaded fastener through an opening formed in a flange, and providing at least one shank nut including a flanged mating end, an opposite non-mating end, and a body extending therebetween. The body includes an internal surface, an external surface, and a centerline extending between the body ends. The flanged mating end includes a substantially planar exterior surface that is aligned perpendicularly to the centerline and an annular groove that extends from the exterior surface at least partially towards the non-mating end. The method also comprises securing the assembly together such that the mating end is positioned flush against the flange and such that the threaded fastener extends at least partially into a bore extending through the shank nut and defined by the shank nut internal surface.

Abstract: A fastener with multiple thread characteristics includes a shank and head. The shank has a penetrating tip distal most from the head. The shank includes a first, conventional thread formation formed therein adjacent the penetrating tip and a second, anti-back-out thread formation adjacent the conventional thread formation, between the conventional thread formation and the head.

Abstract: The present invention relates to a u-bolt comprising, a shaft having a curved portion and two ends, the ends each have a threaded surface, the curved portion is located between the ends, at least a portion of the end has a trilobular shape, and the curved portion is shaped so that a distance between the ends is shorter than the length of the end.

Abstract: A wave threaded fastener and system. A wave thread extends from the outer surface of the body and is made up of a profile wave and a lateral wave. The profile wave includes a plurality of profile crests and profile roots defining a plurality of profile thread widths. The lateral wave includes at least one lateral crest and at least one lateral root defining at least one wave period. Each wave period forms a period arc having a period arc angle and the sum of all period arc angles about the lateral Wave equals three hundred and sixty degrees. Each of the profile crests and roots are aligned with corresponding lateral crests and roots and the wave thread travels one profile thread width per each period arc traveled.

Abstract: The present invention relates to a stud including, a first end and a second end, a torque transferring structure located at the first end, a shaft provided with an axis and including a threaded surface that is provided with a locking thread located adjacent to a Vee shaped thread, the threaded surface is dimensioned to engage a plurality of threads on a nut body, wherein the plurality of threads on the nut body are provided with a diameter greater than an M12, and the locking thread on the shaft is provided with a root surface located between a first angled surface and a second angled surface, wherein the root surface is angled relative to the axis of the shaft.

Abstract: A digital camera contains a circuit board and a battery box inside a housing. The housing and the battery box are made of plastic. The housing is fixed to the battery box with a tapping screw. A conductive plate for preventing the tapping screw from being charged is arranged between the housing and the battery box. Projections of the conductive plate penetrate into thread grooves of the tapping screw. The conductive plate transmits static electricity of the tapping screw to a grounding member of the circuit board.

Abstract: A fastener element (16) has a head section (18), a threaded shank section (17) with threads (20) at a pitch and a distal end section (22). A retention device (24) is secured to the distal end section and is engageable with a fastener receiving member (14).

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

Abstract: The invention relates to an anchoring arrangement (1) having an anchor rod (2) which is anchored with mortar (3) in a bore (4) in an anchoring substrate (5) (concrete). The anchoring arrangement (1) is crack-resistant when the following conditions are fulfilled: bore ? ? diameter diameter ? ? of ? ? anchor ? ? rod * bond ? ? stress ? 14 ? N mm 2 ? ? and ( I ) 0.4 ? diameter ? ? of ? ? anchor ? ? rod bore ? ? diameter ? 0.85 .

Abstract: The present invention relates to a stud including, a head having a torque transferring structure and an underside wherein the underside includes a plurality of protrusions; a shaft having a trilobular shape comprising a plurality of shaft elements having at least one solid shaft element and a plurality of outer surfaces, wherein the plurality of outer surfaces includes a threaded surface with a locking thread located adjacent to a Vee-shaped thread.

Abstract: A fastener element (16) has a head section (18), a threaded shank section (17) with threads (20) at a pitch and a distal end section (22). A retention device (24) is secured to the distal end section and is engageable with a fastener receiving member (14).

Abstract: A self-drilling reaming screw for hard materials such as hard woods or plywood boards each covered with a rigid surface layer has a threaded portion (8) continuing to a drill bit (7), and a non-threaded shank (3) continuing from the threaded portion. The screw has also a conical head (4) continuing from the shank, and a reaming portion (6) is composed of blades protruding out from the shank in opposite radial directions, with each blade (6) being so thick as to be protected from the hard materials (21). The reaming portion has a diameter (W) smaller than but close to the diameter (D) of conical head, and larger than but not close to the diameter (d) of threaded portion. The drill bit (7) forms a rough hole (23) that is then tapped by the threaded portion (8) to give a female-threaded hole (24). The reaming portion (6) enlarges the threaded hole to form a guide hole (25), such that the conical head (4) is forced into it and buried in the hard material.

Abstract: A thread forming screw having a minimum surface hardness of HRC 56. The screw can form threads in a workpiece having a surface hardness which exceeds HRC 23. A method of surface hardening a screw includes carbon enriching the screw to at least a 0.48 carbon level, and then quenching the screw. Then, the screw is tempered such that the surface hardness does not exceed the core hardness by more than 3 Rockwell C points, and both the surface and core are at a Rockwell C33-C39 hardness. Subsequently, the point is induction hardened, and the screw is quenched again. The screw is again tempered such that the lead threads and the first 3-4 full threads are at a Rockwell C56 minimum hardness, preferably to a depth of at least 0.008 inches, and the core of the fastener is at Rockwell C33-C39 hardness. Finally, a finish is applied.

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 self tapping bolt which fastens a mounting member and a receiving member while the bolt cuts internal threads on an inner surface of a tap drill hole prepared in the receiving member. The bolt includes at least one groove formed near an end of a threaded portion of the bolt and a blade for cutting the internal threads. The bolt includes the feature of the blade being formed only on a rear end surface of the groove relative to a rotational direction of the bolt which is screwed into the tap drill hole.

Abstract: A screw-plastic part unit in which the plastic part can be a guide having a tapered bottom end for fitting into a countersink to center the tip end of the screw in the countersink and also can have at least one cut-out portion at its top end to facilitate fracturing of the guide as the screw is threaded into a base member. In one embodiment the screw has a thread between its head and tip end which extends to near the tip end leaving a clear area between the thread end tip end and the part of plastic material molded around the screw clear area in which there can be a circumferential groove or rib into or over which the plastic part is molded to better hold the part to the screw. In another embodiment fins extend into the part hole to hold the screw by an interference type fit.

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: 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: 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 self-tapping screw (1) consists of two interconnected sections (7 and 8) of stainless material. The first section (7) comprising the tool access (4) and the thread (6) consists of stainless, austenitic steel and the second section (8) configured as a boring part (5) consists of martensitic steel.

Abstract: The present invention relates to a self-drilling blind rivet nut which is especially suited for fixation in carbon fiber-reinforced plastic sheets. Said blind rivet nut has a drilling crown at its front end facing away from the set head.

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 self-threading screw is described which includes a (basically) conical point set at the end of its shank opposite that where the head is housed, and a sunken zone set between the end of the screw shank and the conical point. In addition, an apparatus is described to produce a self-threading screw provided with a point and a sunken zone, in which at least the thread of the self-threading screw, the conical point and the sunken zone are simultaneously produced by rolling.

Abstract: A nut fastener is formed with anti-cross threading features that include a rounded or chamfered edge at the entry end to the nut, followed by an unthreaded cylindrical counterbore that extends axially from the entry end to the threaded section of the bore. The rounded or chamfered entry end prevents cross threading and the unthreaded section is of sufficient length to ensure substantially collinear alignment between the threaded fastener and the correspondingly threaded nut before threaded engagement occurs. An optional radiused portion is formed between the unthreaded and threaded sections of the nut to further prevent cross threading. In a preferred embodiment, the anti-cross threading nut is a weld nut formed with weld protrusions which enable the nut to be welded to a large structural member before mating engagement with a threaded fastener occurs.

Abstract: The invention relates to a sheath 46 for protecting a fastener such as a pin-tail locking bolt 18 as it is passed through a passage 14, the sheath 46 defining a first hollow 52 at a first end for receiving part 28 of the pin-tail locking bolt 18 and a second hollow 54 at a second end suitable for collecting a substance such as a sealant 13 in the passage 14.

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: A self-tapping screw type fastener of the present invention is characterized in that an external thread 7 of an adjusting rod (self-tapping screw) 5 is screwed into and fastened to an output rod 1 with tapping an internal thread 3 in an inner peripheral surface of a smooth prepared hole 2 of the output rod 1. The adjusting rod 5 has a threaded shaft 13 with the external thread 7 formed thereon and a smooth guide shaft 14 projecting from an end of the threaded shaft 13. The outer diameter R1 of the smooth guide shaft 14 is set to be smaller than the major diameter R4 of the external thread 7 and to be slightly larger than the minor diameter R2 of the external thread 7 or the minor diameter R3 of the internal thread 3. Because of the diameter difference “t” between the diameter R1 and the diameter R2 or R3, a step 20 is formed so that the step comes in contact with the nearest ridge of the internal thread 3, thereby preventing the adjusting rod 5 from getting loose.

Abstract: A fastener device for attaching a rear face of an acoustic panel to a substrate, comprising an anchor part for attachment to the substrate and a screw part having an inner end rotatably held by the anchor part. The screw part has a helical member with an outer end capable of penetrating the rear face of the panel when rotated by an elongated drive rod projecting from the outer end. The drive rod can penetrate a panel and is accessible from the front face of the panel to cause the helical member to penetrate and engage a rear portion of the panel, and to secure the panel onto the substrate. The drive rod is removable from the outer end of the screw part after the panel has been secured so that the fastener is essentially concealed within the panel.

Abstract: In an assembly of a toroidal continuously variable transmission, a sheath member (41) is temporarily fitted on a male screw (3A) so that a step between a spline part (21A) and a male screw (3A) of a CVT shaft (3) does not catch on an output disk (18, 20) when the CVT shaft (3) is passed through the output disk (18, 20). The outer diameter of the sheath member (41) is gradually reduced in a tapering shape from an outer diameter equal to that of the spline part (21A).

Abstract: A wood screw to be used exclusively for fastening a wooden plate mainly has a screw shank helically disposed with squared threads, wherein a shaft flange is disposed at the bottom end of the screw shank to be parallel or slanted to the longitudinal axis of the screw shank between the upper and the bottom rims of the third and fourth threads. The shaft flange is in a convex trapezoid shape and is positioned vertically along the shank to make a pointed or planar cut so as to reduce friction for a smoother driving, an easier and labor-saving operation.

Abstract: A drill screw includes a boring end having cutting edges adapted to cut when rotated in a counterclockwise direction, and a portion having threads adapted to enter a piece of molding when rotated in a clockwise direction. The drill screw is driven into a piece of molding in the counterclockwise direction to bore a hole therethrough and cause the threads to meet the face of the molding. The drill screw is then rotated in the clockwise direction to cause the threads to tap into the molding, bore through the wall behind the molding, and contact a jackpost behind the wall. Rotation of the drill screw thereafter causes the molding to ride outward from the wall and over the drill screw such that the molding contacts an adjoining piece of molding at an inside corner and thereby substantially eliminating any gap therebetween.

Abstract: A cutting insert for fasteners having a shape with an outline conforming to at least a portion of a contour of a cross-section of on end of on fastener. The insert being made of a material sufficiently strong to provide for self-tapping in application of the fastener.

Abstract: A cold-rolled screw which is intended for screwing into plastic has a narrow self-tapping thread with an inflection on at least one side of the thread so that the inner flank angle is smaller than the outer flank angle but still approximately equal to or larger than one third of the outer flank angle. In a second aspect, the screw thread has an end surface spaced from the free end of the screw to guide the plastic displaced by the thread during threading of the screw.

Abstract: This invention relates to a method of coupling a sheet metal member and a synthetic resin plate member to each other, and a structure coupled by this coupling method. This coupling method includes the steps of forming a plurality of burring holes in the sheet metal member, which is to be coupled to a synthetic resin plate member having a plurality of prepared holes for self tapping screw insertion, by subjecting the sheet metal member to a burring process from the side of its coupling surface, positioning the coupling surface of the sheet metal member on the synthetic resin plate member such that the plurality of burring holes correspond to the plurality of prepared holes, respectively, and screwing self tapping screws in the plurality of burring holes and the plurality of prepared holes from the burring portion side.