Abstract: The fastener assembly comprises a torquing member and a clamping pressure member assembled together on a common axis. The torquing member has threads formed around the axis. An annular bearing surface extends around the axis on one end of the member. The clamping pressure member has an annular bearing surface formed around the axis on one end and an annular clamping surface extending around the axis on an opposite end. The annular bearing surface of the torquing member includes a first series of helically inclined surface segments extending about substantially the same axis as the threads and a second series of helically inclined surface segments extending about substantially the same axis as the threads but provided with a pitch substantially equal to or greater than that of the threads, with an opposite incline.

Abstract: In a screw locking assembly a pair of washers having inclined surfaces are interposed between a screw member on a tightening side and a member to be tightened, with the inclined surfaces being mutually contacted. These inclined surfaces circle around once in spiral form with a lead angle ? smaller than a lead angle ? of the screw, and both ends thereof are connected with a tier face in the axial direction. By conducting an initial-tightening in a state with an interval of a preset angle maintained between the tier faces, and tightening and rotating the screw member on the tightening side until the tier faces come into contact with each other, a tightening force proportional to that angle is generated, and the tightening force is controlled surely with precision.

Abstract: A self-locking bolt has a head with a bearing surface and a threaded part extending from the bearing surface and provided with an external thread of a pitch P for fastening to a first member when the head and threaded part are rotated in a fastening direction. There are n locking projections or recesses at equal angular intervals on the bearing surface, heights or depths of the locking projections or recesses from the bearing surface increasing or decrease gradually in a direction opposite the fastening direction from maximums to minimums with edges of the locking projections or recesses at junctions of the bearing surface and end walls of the locking projections or recesses at the maximums. The maximum height of the edge of the locking projections from the bearing surface of the head is nearly equal to and less than P/n. A second member that is between the bearing surface and the first member when the head and threaded part are rotated in the fastening direction bulges into the locking recesses.

Abstract: A self-attaching nut having an annular pilot, an annular flange surrounding the pilot and an annular groove in the bearing surface surrounding the pilot, wherein the bottom wall of the groove has inclined rectangular protuberances and the outer wall of the groove has radial channel-shaped grooves spaced between the radial protuberances. During installation, panel metal is driven against the inclined radial protuberances, driving panel metal under the inclined outer wall of the groove and into the radial grooves in the flange.

Abstract: A fastener (10) being pressable into a metal sheet in a way safe against rotation and pressing out having a head (12), the side of which after insertion facing the metal sheet is having radially positioned ridges (22), which, when setting the fastener (10), are pressed into the metal sheet, wherein a cylindrical thread-carrier (14) is positioned in the centre of said ridges (22) projecting through the metal sheet beyond the other side of the metal sheet and which in the vicinity of the side of the head (12) facing the metal sheet in the set state is having a surrounding annular recess (20) into which the material of the metal sheet displaced during the setting can be pressed.

Abstract: A locking fastener assembly comprising a nut and a washer. The nut and washer each have opposed load bearing surfaces which include a series of annularly extending, slightly inclined faces forming shallow undulations around each surface. The load bearing surface on the nut is generally spherically convex and the load bearing surface on the washer is generally spherically concave. The nut rotates as it is installed while the washer is prevented from rotating so that the undulating bearing surface on the nut slides over the undulating bearing surface on the washer against ever increasing resistance until the assembly is properly seated and the nut is effectively prevented from counter-rotating by interference between opposed, inclined faces. A concave clamping surface is formed on the outer end of the washer on a radially extending flange. The flange flexes when the assembly is installed and resiliently urges the washer against the nut.

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: A fastener includes a generally square flange having arcuate corners. Eight upstanding ribs are provided, equally spaced about the periphery of the flange. When the fastener is inserted in a piece of material, the ribs dig into the surface of the piece of material to prevent the fastener from rotating when a threaded fastener is advanced into the opening through the shaft from the opposite side. Extending upwardly from the top surface of the flange is an elongated shaft having two adjacent regions, one adjacent the flange having relatively thicker threaded walls and another distal from the flange having thinner unthreaded walls.

Abstract: A fastener includes a generally square flange having arcuate corners. Eight upstanding ribs are provided, equally spaced about the periphery of the flange. When the fastener is inserted in a piece of material, the ribs dig into the surface of the piece of material to prevent the fastener from rotating when a threaded fastener is advanced into the opening through the shaft from the opposite side. Extending upwardly from the top surface of the flange is an elongated shaft having two adjacent regions, one adjacent the flange having relatively thicker threaded walls and another distal from the flange having thinner unthreaded walls.

Abstract: A self-clinching fastener for attachment to a plastically deformable metal panel includes a body portion with a central axis and a central pilot portion extending from the body portion and coaxial with the central axis. The body portion forms a generally annular-shaped end face adjacent the central pilot portion and a groove defined in the end face encircling the central pilot portion. The groove has an inclined inner wall forming an undercut and an inwardly inclined bottom wall such that the groove has an increasing depth in a direction toward the undercut. The inclined bottom wall is formed by a plurality of generally flat faces and the inclined inner wall is formed by a plurality of generally flat faces which are aligned with the faces of the bottom wall. The fastener further includes a plurality of spaced apart lugs encircling the central. pilot portion and axially extending from at least one of the end face and the groove. The lugs form abutments to improve torsional resistance of the fastener.

Abstract: The present invention has been accomplished to provide an earth nut which has an excellent grounding performance, and which is free from the possibility of losing a grounding function even upon application of a high axial force and is low in cost, said earth nut comprises a flanged nut having a flange, which is formed at a lower end of a nut body to be integral with the nut body, a plurality of projections formed at a lower portion of the flange near an outer peripheral edge of the flange for cutting and peeling off a coating film on a seat surface, with which a bottom surface of the nut contacts, and a plurality of longitudinal grooves provided on screw threads of a female thread portion of the nut body to extend axially of the nut body and having edges on one sides of lines of intersection of the screw threads of the female thread portion of the nut and the longitudinal grooves to peel off a coating film adhered to screw threads of a bolt, onto which the nut are screwed.

Abstract: A fastener for removably securing components to a skateboard is disclosed. The fastener includes a bolt having a head from which one or more fillets extend in coaxial alignment along the bolt shaft, and are equiangularly spaced about the bolt shaft. The fillets decrease in outer diameter as they extend down from the bolt head and terminate at or above a threaded or non-threaded extent of the shaft. Outer flange-like tips extend from the substantially planar bolt head in a spaced, circumferential arrangement, and optionally, the flanges are turned down at their distal ends in the direction of the top surface of the skateboard. When tightened, the fillets engage with the walls of the bolt hole and the flanges bite into the top surface of the skateboard, preventing rotation of the bolt in the fully installed condition but enabling ready removal of components as desired.

Abstract: A countersunk head screw is provided. The countersunk head screw includes a head attached to or integrally formed with a shank. A thread extends over a partial region of the shank and a portion of the head includes a bearing surface that tapers conically towards the shank. At least one restraint rib is arranged in a top region of the bearing surface turned away or spaced apart from the shank. Additionally, at least one cutting rib is arranged in a lower region of the bearing surface facing or adjacent the shank.

Abstract: In a screw for fastening sections to a substructure, a shank (2) is provided with a boring portion (4) and a threaded portion (5) as well as a screw head (3). The portion (6) of the shank (2) adjacent to the screw head (3) flares conically toward the screw head (3). On its underside (7) the screw head (3) is provided with projections and/or depressions. During use for fastening sections to a substructure, the section to be fastened is pressed by the conical portion (6) in screwing direction against the fexed substructure (11).

Abstract: A bolt assembly includes a bolt member, a washer, and a nut. The bolt member includes a head and a shank. The shank has a connecting section that is connected to an article confronting side of the head, an externally threaded section that extends from the connecting section, a breakable tip that extends from the externally threaded section and that is formed with a plurality of axially extending and angularly displaced teeth, and an annular groove that is formed at a juncture of the externally threaded section and the breakable tip. The washer is sleeved on the shank of the bolt member, and has an article confronting side formed with a plurality of spaced apart and radially extending anti-skid projections, and a nut confronting side opposite to the article confronting side of the washer.

Abstract: A fastener (10) for locking receipt in an opening (34) of panel (36) has an upper end portion (16), a flange (18), and a locking insert (24) for receipt in the opening (34) and forcibly distended to prevent removal of the fastener from the opening. A number of gripping means (22) formed in a surface of the flange (18) each include a knifelike edge (32) with a slot (33) at each side thereof. The gripping means bite into the panel providing purchase resisting rotation of the fastener relative to the panel.

Abstract: A countersunk head screw is provided. The countersunk head screw includes a head attached to or integrally formed with the shank. A thread extends over a partial region of the shank and a portion of the head includes a bearing surface that tapers conically towards the shank. At least one cutting rib is arranged in a lower region of the bearing surface facing or adjacent the shank. Additionally, at least one restraint rib is arranged in a top region of the bearing surface turned away or spaced apart from the shank.

Abstract: Conductive devices and tools to provide electrical conduction with a generally planar conductor which is covered with an insulation substance such as paint, rust or dust, by scraping a portion of the conductor and removing the insulation substance. A conductive device includes a conductive metal serration means and a tool utilizes such a serration device. Such a serration device can be a bolt device, nut device or washer device, or washer-incorporated threaded device. A connector device is also disclosed to provide electrical conduction between a conductor and a conductor plate covered with an insulation substance.

Abstract: A fan retention system for a blower/vacuum securely retains the fan and creates an insulating barrier to prevent the operator from touching the functionally insulated armature shaft. A nut having interlocking ramps for interlocking with interconnecting portions on an abutting fan surface is provided. The interconnecting portions of the fan may be either ramps or recesses. Furthermore, the nut has a closed end for insulating the armature shaft from the operator.

Abstract: A self-clinching fastener for attachment to a plastically deformable metal panel includes a body portion with a central axis and a central pilot portion extending from the body portion and coaxial with the central axis. The body portion forms a generally annular-shaped end face adjacent the central pilot portion and a groove defined in the end face encircling the central pilot portion. The groove has an inclined inner wall forming an undercut and an inwardly inclined bottom wall such that the groove has an increasing depth in a direction toward the undercut. The inclined bottom wall is formed by a plurality of generally flat faces and the inclined inner wall is formed by a plurality of generally flat faces which are aligned with the faces of the bottom wall. The fastener further includes a plurality of spaced apart lugs encircling the central pilot portion and axially extending from at least one of the end face and the groove. The lugs form abutments to improve torsional resistance of the fastener.

Abstract: An enhanced terminal screw for use in an electrical receptacle includes a shank, a head and a plurality of impeller wire gripping elements. The shank has opposite ends. The head is mounted to one of the opposite ends of the shank. The head has an underside surface defining a plurality of spaced apart grooves. The impeller wire gripping elements are defined by a plurality of lands formed between the spaced apart grooves on the underside surface of the head which grip a wire partially surrounding the shank and wrap the wire radially inwardly toward the shank as the screw is tightened relative to the wire. Each land has opposite edges providing a gripping surface.

Abstract: The present invention relates to a rivetable element or fastener which comprises a shaft or barrel portion and an integral head portion which can be permanently affixed in a sheet metal part or panel by riveting, an assembly comprising a sheet metal part or panel and the riveting element, a method for the manufacture of the assembly, and a die specifically designed for forming the fastener and panel assembly. The underside of the head portion adjacent the shaft or barrel portion includes an out annular contact surface and an inner riveting portion which includes a plurality of spaced shallow pocket or closed fields which entrap the panel metal during installation. The shaft or barrel portion includes at least one depression based from the plane of the contact surface which, in the preferred embodiment, comprises a spiral thread.

Abstract: The bucket elevator construction bolt comprises a flat head and a threaded shaft, the bolt further incorporating a collar adjacent the head, the collar including a plurality of elongate, radially arrayed spline teeth which engage within the material of the elevator belt, maintaining the bolt position against radial torque or vibratory forces applied thereto.

Abstract: Presented is a metallic cannulated rivet adapted for implantation in a bone mass through use of arthroscopic or open surgery for attachment of soft tissue thereto. The rivet in a first configuration is implanted, following which, a portion of the implanted rivet projecting from the bone site and penetrating the soft tissue is reformed in situ to clamp the soft tissue to the bone site. In a second aspect, the invention comprises the method and instrumentalities for effecting implantation of the rivet and reformation thereof in situ to mechanically clamp the soft tissue to the bone site. The method includes forming a small portal or incision to expose and prepare the bone site, torn or severed soft tissue is mobilized to intimately contact the bone site, the soft tissue is retained in proper position and a K-wire is advanced through the portal to penetrate the soft tissue and the bone mass to a predetermined depth and mark the point of implantation of the cannulated rivet.

Abstract: The invention relates to a countersunk head screw with an even number of ribs with countersinking blades on the underside of the screw head and projecting therefrom. Every other rib has a step at its end towards the screw shaft formed by shortening the rib concerned in relation to each adjacent rib.

Abstract: A faying plate having a clearance hole is fastened to a tapping plate having a tapping hole by a fastener having a shank with a tapered tip and with a self-tapping thread. The shank, which defines an axis, is adapted to tap a complementary thread around the tapping hole, via the self-tapping thread, when the fastener is driven rotatably. The fastener has a unitary head with a bearing portion having a peripheral edge and a having surface facing the shank, flaring outwardly toward the shank, and frusto-conical at a conical angle of about 5.degree. relative to a plane perpendicular to the axis. Eight torque-absorbing ribs project from the clamping surface, are spaced at regular intervals about the axis, and have ridges that lie on an imaginary, frusto-conical surface flaring outwardly toward the shank at a conical angle of about 1.degree. relative to a plane perpendicular to the axis and at a conical angle of about 4.degree. relative to the clamping surface. Each rib has a depth from not less than 0.

Abstract: A fastening screw is provided with a locking function to prevent loosening thereof after being tightened.

Abstract: An improved relief screw is provided for installing a wallboard panel to a stud, which consists of a flat head made of an inverted rectilinear slant height frustrum portion and a straight thin cylindrical portion. The straight thin cylindrical portion is larger than the widest part of the rectilinear slant height frustrum portion, therefore creating an annular flange thereabout. A threaded shank with a conical point extends from a narrow part of the rectilinear slat height frustrum portion, while the flat head bas a recess to accommodate a driving tool element for imparting rotary motion thereto. A structure is in the flat head for relieving particles of the wallboard panel therefrom, after the flat head is driven into the wallboard panel. The top of the straight thin cylindrical portion will be flush with and not damage the outer surface of the wallboard panel, while the annular flange will add more gripping support thereto.

Abstract: An electrical grounding connector, electrical grounding connector assembly, and a method of attaching an electrical grounding connector and electrical grounding connector assembly to an electrically conductive panel is disclosed. The grounding connector assembly includes a grounding stud connector having a body portion disposed between, and integrally joining, a stud portion and a riveting portion. The body portion includes a flange extending generally radially from the body portion and the flange includes a panel engaging surface and a lug engaging surface. A protective nut is adapted to engage and substantially cover the stud portion of the grounding stud connector thereby protecting the stud portion from contaminants. Barbed elements are disclosed on various surfaces of the grounding connector thereby giving the grounding connector excellent electrically conductive properties when it is assembled to an electrically conductive panel.

Abstract: The present invention discloses a screw for use with very thin sheet metal. The screw has a head and a shank which has a first and relatively very short tapered section and a second, longer, substantially cylindrical section. The first section attaches to the underside of the head on one end and to the cylindrical section on the other. The first section is broader at the end attached to the head and carries two or fewer turns of threads. The second section of the shank carries uniform threads that are continous with the threads on the first section. The underside of the head also has locking serrations which are triangular, having an included angle of 28 degrees and gradually increase in height at slope of 8-10 degrees with a length of approximately twice their height at their highest point.

Abstract: A locking fastener in accordance with the invention comprises a head or a nut body having a radially outer surface defining an outer periphery of selectible configuration and a height dimension defining an axial direction. A shank or a locking neck portion extends axially from the head or nut body and has a radially outer surface defining an outer diameter of smaller cross-sectional dimension than the outer periphery of the head or nut body. A substantially flat radially extending locking surface is defined on the head or nut body between the outer surface thereof and the outer surface of the shank or locking neck, and a plurality of raised locking ribs extend across at least a portion of the locking surface, each of the ribs being arranged angularly offset in a direction corresponding to the direction of rotation of the nut to attain advancement toward a clamped engagement, (viz.

Abstract: A tamper-proof fastener provided with a threaded shank and a low-profile drive head integral therewith. The drive head has a generally frusto-conical shape defining a circular flat top and a circular base of larger diameter, three short noses separated 120 degrees apart projecting from the sloped side of the drive head. The fastener is installed in a substrate or withdrawn therefrom by means of a tool having a driver head provided with a complementary frusto-conical socket to accommodate the drive head of the fastener, the wall of the socket having recesses therein to receive the noses of the head whereby a torque may be applied thereto.

Abstract: A closure ring assembly for securing a cover in sealed relation over the open top of a storage drum container in which a split ring is closed by tightening a headed tie bolt between a pair of laterally spaced lugs fixed to the ring on opposite of the split therein; the bolt freely passing through one of the lugs and threadingly engaging the other so that upon tightening the bolt the ring is contracted with the one non-threaded lug having outwardly extending teeth for engaging the bolt head to lock the same in tightened position.

Abstract: An electrical grounding connector, electrical grounding connector assembly, and a method of attaching an electrical grounding connector and electrical grounding connector assembly to an electrically conductive panel is disclosed. The grounding connector assembly includes a grounding stud connector having a body portion disposed between, and integrally joining, a stud portion and a riveting portion. The body portion includes a flange extending generally radially from the body portion and the flange includes a panel engaging surface and a lug engaging surface. A protective nut is adapted to engage in substantially cover the stud portion of the grounding stud connector thereby protecting the stud portion from contaminants. Barbed elements are disclosed on various surfaces of the grounding connector thereby giving the grounding connector excellent electrically conductive properties when it is assembled to an electrically conductive panel.

Abstract: A shape of the head part of the screw is improved and performance of insertion of the screw when punched and performance of fastening of the screw when seated as well as a finishing treatment upon completion of the fastening against a fastened member are improved.The head part is made such that the upper surface having an engaging groove to with which a screw driver tool is engaged has a spherical surface, and the head part is comprised of an upper large diameter part formed with a first seat surface of inverse truncated cone shape having an outer circumference of a curved concave surface and a small diameter part formed with a second seat surface of an inverse truncated cone shape concentrically and integrally connecteed to a lower part of the large diameter part and having its outer circumference of a curved concave surface, and an annular projecting edge is formed at a connection part between the seated surfaces of the two-stage curved concave surfaces.

Abstract: A torque-absorbing rotary threaded fastener for joining metal panels has a stripping torque sufficiently in excess of its driving torque to ensure that it will be relatively unlikely to be stripped when mechanically driven home. The fastener has a clamping face which includes a number of polyhedral nibs extending axially therefrom and separated from one another by substantially planar uninterrupted portions of the clamping face. The nibs include a leading wall and a trailing wall, facing in the direction of tightening and opposite thereto, respectively. The leading wall may be inclined at a steeper angle with respect to the plane of the clamping face than is the trailing wall, or vice versa. The leading wall and the trailing wall meet to form an apex which is also inclined with respect to the plane of the clamping face, so that the nibs increase in axial height as one views outward toward the periphery of the clamping face.

Abstract: This invention relates to a set screw comprising a shank having external threads and a work-engaging end portion integrally formed at one end of the shank. The work-engaging end portion has a frustohemispherical outer surface comprising a plurality of circumferentially spaced serrations in the form of teeth. Each of the teeth comprises a ramp extending outwardly from a root to a crest thereof with the ramp being inclined in a direction which is opposite to the direction of rotation of engaging the set screw in a workpiece. A cavity is formed in the outer extremity of the work-engaging end portion. The cavity cooperates with the frustohemispherical outer surface to form therebetween an annular wedge. The work-engaging end portion can be readily formed by a forging process.

Abstract: A mounting screw for mounting an electrical wiring device having non-metallic components, to an electrical outlet box and combination of root electrical wiring device and screw. The screw includes a head and a shank, with a lip projecting downwardly from the bottom surface of the screw head spaced from and encircling the shank, and a series of ribs extending radially outward between the shank and the lip. Advantageously the mounting screw is in combination with an electrical wiring device having non-metallic mounting straps so that when the screw is installed by a power tool, the lip-and-ribs arrangement on the screw bites into the mounting strap material to produce resistance to the turning of the power tool signaling the operator that the screw is secure.

Abstract: A fastener for insulated roofing comprises a non-metallic, screw-threaded shank, having a penetrating point at one end of the shank and a transverse plate carried at the other end of the shank. The shank and transverse plate are preferably integrally method out of a polyetherimide resin formulation which has a tensile strength of at least 15,000 psi. as tested by ASTM D638. Such a fastener has a great advantage in terms of cost and lack of corrodability, while still exhibiting the required strength. Also, a universal driver socket is provided.

Abstract: A self-locking fastener having a bearing surface comprising a plurality of sets of serrations arranged to penetrate a workpiece such that while a resistance to the loosening of the fastener from the workpiece is created the marring of the workpiece surface is minimized. Use of the fastener is particularly advantageous if the workpiece consists of soft materials such as cast-aluminum or non-heat treated carbon steels. Each set of serration, when viewed as a profile, includes a downwardly inclined surface, a relatively deeper serration and a relatively shallower intermediate serration. The intermediate serration controls the depth of the penetration into a workpiece.

Abstract: An improved threaded fastener is provided with a shank, a head connected to the shank, and a thread form on the shank terminating below the head. A plurality of lugs are provided above at least a portion of the thread form and are circumferentially disposed under the fastener head around the shank seriatim from a first lug to a last lug. Each lug defines an exposed engaging margin extending from the fastener shank at an acute angle relative to the longitudinal axis of the fastener. The maximum radial dimension of each lug progressively increases from the first lug to the last lug while a corresponding maximum axial dimension of each lug progressively decreases whereby the acute angle becomes progressively greater.

Abstract: A metal threaded fastener is disclosed for use in outdoor or other environments where fastener rust or corrosion are to be discouraged. The fastener includes a metal head adapted for engagement with a torque wrench or the like. The head is covered by a polypropylene jacket. Raised metal protuberances below from a bottom clamping surface of the head. In one embodiment, these protuberances extend at least partly through the polypropylene jacket, but the thin covering layer of polypropylene is displaced from the protuberances during bolt installation. These protuberances provide metal-to-metal contact with a workpiece, and consequently encourage maintenance of a correct axial clamping pressure without over-torquing the mating nut.

Abstract: A threaded fastener is provided having a head for accommodating a tool for rotating the fastener. A plurality of ribs culminating in teeth are provided under the head for engaging the material into which the fastener is inserted, each rib and tooth having a ramp surface and a brake surface, the ribs being oriented for inhibiting either clockwise rotation or counter-clockwise rotation of the fastener by torque created through contact of the brake surfaces with the material. The ribs are formed on the fastener during the heading process by means of a matched die set.

Abstract: A self-locking fastener having a bearing surface comprising a plurality of sets of serrations arranged to penetrate a workpiece such that, while a resistance to the loosening of the fastener from the workpiece is created, the marring of the workpiece surface is minimized. Use of the fastener is particularly advantageous if the workpiece consists of soft materials such as cast-aluminum or non-heat treated carbon steels. Each set of serration, when viewed as a profile, includes a downwardly inclined surface, a relatively deeper serration and a relatively shallower intermediate serration. The intermediate serration controls the depth of the penetration into a workpiece.

Abstract: An improved fastener provides axially extending teeth on a narrow shoulder adjacent the fastener head. The teeth bite into sheet material, and are particularly useful in biting into the surface of a thin sheet which is fastened to a thicker sheet material. The teeth extend from a shoulder formed on a medial collar between the head and a threaded shank. The narrow shoulder has a larger diameter than the end of the threaded shank to which the shoulder is joined. The teeth can be formed by cold-flow of the material of the shoulder so that the teeth axially extend from the outer peripheral edge of the shoulder in order to bite into the thin sheet metal proximate the annular periphery of the aperture in which the threaded shank is engaged. Preferably, the teeth axially overlap the threading of the shank which extends entirely to its junction with the shoulder, and the teeth are fabricated after the shank thread in order to enable such overlap by the teeth.

Abstract: A trim clip for fixing a decorative member onto a vehicle body trim from which a threaded stud has been previously secured by welding is provided. The clip features a hollow portion with resilient pawls for receiving the threaded stud and a head portion having at least one ridge formed on the surface facing the trim to prevent rotation due to vibration when the vehicle is moving.

Abstract: A connection (20) for oilwell tubular joints (8 and 9) to effect a fluid tight conduit wherein one of two cooperating stop shoulders (19) of limited dimension is formed with peaks (22) and valleys (24) such that the peaks contact the other stop shoulder (18) upon full make-up of the connection so as to provide channels (24) for the escape of lubricant from between the shoulders and thereby effect a higher overload torque capacity for the connection, without sacrificing other characteristics of the connection.

Abstract: A sheet metal screw is disclosed having an enlargement in the form of a helical ramp on the shank adjacent the head, which ramp extends for only about 180 degrees for providing an interfering fit with a workpiece to obtain an anti-stripping action while permitting the screw to provide an effective clamping action.

Abstract: A fastener having a body defining an axis of rotation extending downwardly from the body and formed integrally therewith is provided with a flange extending radially and downwardly from the body. The flange is slotted to define a plurality of deformable tabs joined at their respective bases to the body. At least a portion of each tab is twisted relative to its base about an axis extending along the flange radially from the axis of rotation in a direction so that the leading edge of each tab as defined by the slots, the edge being on the side of the tab facing in the direction of rotation of the fastener for tightening, projects downwardly.

Abstract: A locknut having a single-turn thread for securing electrical fittings, threaded conduit and the like to electrical junction boxes and the like is disclosed. The locknut comprises a generally cylindrical portion, a flange portion attached to the cylindrical portion, a plurality of teeth attached to and projecting radially outwardly of the flange portion and axially beyond the end of the flange portion, and a standard thread attached to and extending for substantially only a single turn interiorly of the cylindrical portion. The thread has an included angle corresponding to that of a standard thread, for example, 60.degree.. The teeth seat against a work surface when the locknut is threaded onto the fitting and act as springs which can compensate for a small degree of element loosening by spring recovery. In addition, the thread of the locknut is flexible so that both the teeth and thread act as springs working in conjunction with each other.