Abstract: A bowed snap-disc includes inner and outer perimeters that provide the disc with operating characteristics not found in comparably sized discs. At certain points along its circumference, the inner perimeter extends farther from the disc's center than certain other points of the disc's outer perimeter. This provides the disc with a unique combination of spring constant, compressive force, deflection and coefficient of compliance. The disc is particularly useful as a small, flat compression spring; a shaft or bar locking element; tightness indicator for a threaded fastener; or a lock washer.

Abstract: A fastener assembly 10, in respect to forces which are subsequently applied, after the installation thereof, when forces is applied in one direction, this fastener assembly 10 is self adjusting incrementally, as needed in travel or actuation; yet when a force is applied in the opposite direction, this fastener assembly 10 is not self adjusting and there is no travel or actuation.

Abstract: A fastener for a heat-radiator on a chip has a leg with a lower end and an upper end. A cone-shaped foot of which a maximum diameter is larger than that of the leg is formed at the lower end of the leg. A head is formed at an upper end of the leg. Two flexible bow arms are oppositely formed at two sides of the leg, each with a first end fixed on a bottom face of the head. A ring is formed on second ends of the bow arms. An opening is defined in the ring for the leg extending therethrough. A resilient member is provided outside the leg and extends through the opening.

Abstract: A compression limiter formed by a roll forming process includes a substantially cylindrical body portion and a plurality of feet. A plurality of notches are stamped along a lower edge of a flat sheet of stock and bent to form the plurality of feet. The flat sheet of stock is then rolled to form the compression limiter. In the preferred embodiment, the compression limiter is formed of a high carbon steel. The plurality of feet of the compression limiter transmit the bolt load of a fastener attaching a plastic intake manifold to a component. In an alternative embodiment, an angled portion attaches each foot to the body of the compression limiter which accommodates for variations in the height of the plastic intake manifold.

Abstract: A conductive lock washer for safely dissipating electrostatic charge which builds up on a disk surface without discharge across the head/dish gap. The lock washer, including a series of alternating inner and outer tabs, acts to reduce torque on the spindle washer damper and hoop stress on the washer itself, while still creating a conductive pathway to the top cover of the hard drive assembly.

Abstract: A conductive lock washer for safely dissipating electrostatic charge which builds up on a disk surface without discharge across the head/dish gap. The lock washer, including a series of alternating inner and outer tabs, acts to reduce torque on the spindle washer damper and hoop stress on the washer itself, while still creating a conductive pathway to the top cover of the hard drive assembly.

Abstract: With the object of obtaining a reliable grounding of the antenna, even if the panel of the vehicle is deformed or the elasticity of the base pad or O-ring weakens, a washer portion 21 is integrally secured to a nut portion 20 via a wave washer 22. This securing is performed by mounting a joint portion 23 in washer portion 21, and by mating protuberances 23e of second protruding pieces 23d of joint portion 23 with a ring-shaped groove portion 20b that is formed inside a first through-hole 20a of nut portion 20. Even if the vehicle panel the antenna is mounted, and so forth, is deformed, or the stress on the antenna-mounting nut 6 weakens, this change is absorbed by wave washer 22, and thus a marked reduction in the press-contacting force of the antenna-mounting nut 6 does not occur, and the grounding of same is made reliable.

Abstract: A lock washer for locking a threaded fastener from loosening under vibration includes an annular body with a central opening cutting from a sheet or plate of Nitinol, and an integral layer of NiTiOx on at least one face of said body. The lock washer is made of a high transition temperature form of Type 55 Nitinol that remains in its martensitic state in all normal conditions of use. The martensitic Nitinol initially yields during torquing of the nut to allow the nut to indent itself slightly into the lock washer. The resulting cold working of the washer material causes a transformation into stress-induced martensite, which is strong and elastic to resist further deformation and also exerts a preload on the bolt shank. The nut, indented into the lock washer, strongly resists turning under vibration, which effect is further enhanced by the vibration absorbing characteristics of the material. The integral layer of NiTiOx on the surface of the washer provides electrical insulation, minimizing galvanic corrosion.

Abstract: A fastener assembly includes a threaded fastener having an axial shaft. A spring is disposed coaxially around the shaft and is capable of compression and expansion in the longitudinal direction defined by the shaft. First and second stops are disposed along the shaft. The spring is pre-compressed and is disposed between the stops so that its expansion is limited by the stops. One end of the spring is mechanically coupled to a work piece. When the fastener is turned, relative displacement develops between the shaft and the work piece. The displacement causes the spring to further compress as the work piece end of the spring and the second stop move away from one another. The force of the compressed spring is transferred to the work piece.

Abstract: A captive fastener device is utilized to hold two members together. The device is comprised of a housing which may be securely attached to the first member. Within the housing is a spring which biases a bottom of a first lip of a cup washer. The top of the first lip contacts the top of the housing when the fastener is not engaged. The fastener has a ledge at the bottom of the fastener head which rests on a top surface of a second lip of the cup washer. The bottom surface of the second lip contacts the first member when the fastener has fully engaged the second member to secure the first and second members together. The first lip of the cup washer has a greater diameter than the second lip. The first lip also has a greater diameter than the fastener. When the fastener is not engaged, a top surface of the first lip engages a bottom surface of the top of the housing.

Abstract: Attachment device for a component to be attached to a plate, which is three-dimensionally adjustable with respect to the plate. The attachment includes a sleeve which is inserted into an opening of the plate and locked with respect to the plate by means of rotation. A tubular piece with a through hole is screwed into the sleeve into which a screw is inserted with substantial positive allowance for radial adjustability. This screw rests with its head at one end of the tubular piece and supports with its threaded part the component which abuts to the other end of tubular piece which, for axial adjustment, is optionally far screwed in.

Abstract: A flexible disk for securely holding insulation to an air duct made from a resilient material, and having a convex upper surface and a diameter of from 1.5 inches to 4.0 inches. A washer for receiving a disk fastener is centrally positioned in the disk top, which is thicker than the top. A rim is located at the circumference of the top which has a planar bottom for contacting the insulation. When the disk is properly attached to an air duct by a fastener, it deforms to a concave configuration by which it resiliently exerts force on the underside surface of the disk and the rim which in turn presses downward on the insulation, securely holding the insulation in place without crushing the insulation.

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 retainer clip for retaining components on a shaft eliminates the need for a threaded shaft and a hex nut to retain the components on the shaft. The retaining clip includes a main body having a through hole for accommodating the shaft, a plurality of teeth for engaging the shaft and projecting radially inwardly from the main body and a plurality of spring members projecting in a direction transverse to the main body.

Abstract: A pivot assembly is provided for pivotally attaching a pivotable seat component to a fixed seat component. The fixed component includes first and second apertures, first and second outer surfaces and first and second inner surfaces adjacent the apertures, and the pivotable component includes at least one pivot hole therein. The pivot assembly includes a bolt having a head, a cylindrical portion and a threaded portion. A threaded nut is engageable with the threaded portion of the bolt. A generally cylindrical plastic bushing is fitted over the cylindrical portion of the bolt and includes a peripheral lip abutting the head of the bolt and a plurality of swageable flanges extending at least partially over the threaded portion of the bolt.

Abstract: The attachment member includes a bore (6) for receiving a fastener (10), a front support surface (3) intended to be placed against the component (20) to be fixed, and an extension (8) for positioning the attachment member and absorbing the shock caused by the fastener (10) striking the attachment member upon fixing.

Abstract: The hardness of the outer peripheral surface of a small-diameter portion 47 and one side surface of a collar portion 52, which respectively rub against a belleville spring 39a, is set at HRc45 or higher, thereby enhancing the wear resistance of these surfaces. On the other hand, the hardness of a fastening tubular portion 51 is set at HRc3O or lower, thereby making it difficult for the fastening tubular portion 51 to be damaged or cracked when it is fastened.

Abstract: A fastening device (20), for use in holding a base plate down to a railway sleeper. The device is of the type having a head portion (21), a screw-threaded shank portion (22) and an intermediate portion (23) connecting the head portion (21) to the screw-threaded shank portion (22), with the intermediate portion (23) and the screw-threaded shank portion (22) being of smaller diameter than the head portion (21).

Abstract: The invention relates to a pipe coupling having a sleeve-shaped outer body for accommodating a sealing arrangement and at least one pair of clamping elements, which is arranged adjacent to one side of the sealing arrangement inside the sleeve-shaped outer body and serves to clamp the end of an inserted pipe in place, in which case the pair of clamping elements can be restrained against the end of an inserted pipe transversely to the axis of the pipe coupling via a clamping screw passed through the sleeve-shaped outer body and is pressed apart by of a spring, and the clamping elements are guided in the restraining direction in the sleeve-shaped outer body.

Abstract: The present invention provides an apparatus used with materials fabrication power tools to reduce errors associated with loose-fitting materials fabrication guides. The present invention provides a materials fabrication surface having a slot and a guide variably positionable within the slot and capable of mounting a fixture such as a miter gauge. The guide includes an expandable member coupled to the guide member such that, upon expanding, the distance between the guide and the walls of the slot can be reduced. By reducing the distance between the guide member and the slot walls, inaccuracies associated with the guide member-to-slot interface are eliminated. In this manner, a fixture, such as a miter gauge, can be mounted and used on the guide and used with the power tool to increase accuracy and repeatability associated with the materials fabrication operations.

Abstract: A multi-part vibration isolating fastener assembly includes a bolt having a threaded shank and a head about which a sleeve and resilient grommet are disposed. A cup washer is disposed about and captured axially on the grommet to provide a unitized assembly. The integrated cup washer defines a self-contained cup-shaped socket to provide proper support and containment for the grommet in applications where the usual cup-shaped grommet wall is lacking in the components to be assembled, such as a valve cover, and cylinder head.

Abstract: A hold down device and method for connecting two building elements of a building comprises an elongate member, typically in the form of a rod or a cable, that is connected between the two building structures. A tension compensator, which includes a housing, is mounted to the elongate member to compensate for wood shrinkage of the building. One end of the elongate member penetrates the housing and is releasably connected to the housing by means of a gripping assembly which permits only one way movement of the elongate member into but not out of the housing to resist tensile forces between the two points of the building but allow the elongate member length to be adjusted as the distance between the two points decreases due to wood shrinkage. An urging mechanism urges the end of the elongate member further into the housing if the tension on the elongate member falls below a predetermined level. The urging mechanism, in some embodiments, has to be put under compression.

Abstract: A direct tension indicating washer including a body having an internal opening formed therein and at least one arched tab connected to the body. The arched tab has a fixed end integral with the body and a distal end movable with respect to the body. Indicia is formed on the arched tab and when the direct tension indicating washer is tensioned, the arched tab moves away from the body. Alignment of the indicia with a reference indicates proper tension. Another embodiment of the invention is a direct tension indicating washer having a body having an internal opening formed therein and at least one arch connected to the body. The arch has a first end integral with the body, a second end integral with the body and an intermediate portion between the first end and second end. The intermediate portion is positioned above a top surface of the body.

Abstract: A flexible disk for securely holding insulation to an air duct made from a resilient material, and having a convex upper surface and a diameter of from 1.5 inches to 4.0 inches. A washer for receiving a disk fastener is centrally positioned in the disk top, which is thicker than the top. A rim is located at the circumference of the top which has a planar bottom for contacting the insulation. When the disk is properly attached to an air duct by a fastener, it deforms to a concave configuration by which it resiliently exerts force on the underside surface of the disk and the rim which in turn presses downward on the insulation, securely holding the insulation in place without crushing the insulation.

Abstract: Bolted mounting assemblies for use between two mounted components wherein one of the components experiences vibration typically use rubber shock absorbers to dampen the vibration transfer between the components. The rubber shock absorbers are expensive and complicated to manufacture and are limited in flexibility control. The present invention overcomes this and other problems by providing an adhesive with damping capabilities between washers in a bolt assembly. The bolt assembly is used to mount first and second components with the washers therebetween. The adhesive is spaced a predetermined distance from a longitudinal axis of a bolt and has a non-uniform thickness which increases as the distance from the longitudinal axis increases to provide protection from bending loads about the axis. The washers with adhesive form a washer assembly with damping and flexibility characteristics controlled through variations in the design.

Abstract: A chuck for rotary tools with a cylindrical chucking shank encloses such shank with a basic body. A radial through-hole in basic body serves to receive a clamping screw which applies pressure to a clamping member which is seated inside a through-hole between the clamping screw and chucking shank. A clamping member is provided with a radial projection and the through-hole with a cross-sectional narrowing along its inner end. In between the radial projection and the narrowing is an elastically compressible spring element which, due to its return force, lifts the clamping element away from the chucking shank and pushes it back into the through-hole when it is not under tension from the clamping screw.

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: Bolted mounting assemblies for use between two mounted components wherein one of the components experiences vibration typically use rubber shock absorbers to dampen the vibration transfer between the components. The rubber shock absorbers are expensive and complicated to manufacture and are limited in flexibility control. The present invention overcomes this and other problems by providing an adhesive with damping capabilities between washers in a bolt assembly. The bolt assembly is used to mount first and second components with the washers therebetween. The adhesive is spaced a predetermined distance from a longitudinal axis of a bolt and has a non-uniform thickness which increases as the distance from the longitudinal axis increases to provide protection from bending loads about the axis. The washers with adhesive form a washer assembly with damping and flexibility characteristics controlled through variations in the design.

Abstract: The device includes an inverted first cup shaped member having a center portion with an aperture therethrough and further having a side wall. A second cup shaped member includes a center portion with and aperture therethrough and a side wall in slidable engagement with the inner wall of the side wall of the first cup forming a compartment therebetween. An is mounted within the compartment which is made of a shape memory alloy having first and second sides at least partially engaged with the center portions of the first and second cups, respectively; and also having an aperture therethrough aligned with the apertures in the center portions of the first and second cups. At least one heating element is mounted about the insert and a flexible compound encapsulates the at least one heating element. The insert can be made from the memory alloy where a deformation undergone in the martensitic state is definitively cancelled out during the passage to the austenitic state.

Abstract: A break-away lug nut positioner for holding lug nuts on a race car wheel to facilitate more rapid tire changes during pit stops. The break-away lug nut positioner includes a spacer that supports a lug nut at a proper distance over a mounting hole of a race car wheel. That is, the spacer holds the lug nut so that it is adjacent to a threaded mounting stud when the wheel is held flush against the race car hub. During installation, the lug nut is driven into the spacer cavity, forcing the spacer to break into pieces. The adhesive bond between the lug nut and the spacer is weaker than the individual pieces of the spacer, which causes the spacer to separate cleanly from the lug nut, allowing the lug nut to seat properly against the wheel mounting plate. That is, the adhesive and the material and configuration of the spacer are selected so that the spacer breaks cleanly away from the lug nut, and no spacer material remains between the lug nut and the mounting plate.

Abstract: An escutcheon locking ring for an automatic sprinkler head having an externally threaded section with a top portion having an engaging member extending therefrom comprises a ring having a plurality of tabs extending from the inner perimeter, and an outer perimeter having a plurality of escutcheon engaging fingers depending therefrom. The escutcheon engaging fingers are curved and are formed with sharp ends. When positioned between the bottom surface of the engaging member and the escutcheon, the sharp ends of the depending escutcheon engaging fingers penetrate the surface of the escutcheon. An attempt to unscrew the escutcheon from the sprinkler head causes the rotation of the ring until frictional contact is made between the extending tabs and the engaging member. Once frictional contact is achieved, a positive lock is formed preventing one from unscrewing the escutcheon from the sprinkler head. In an alternative embodiment, the extending tabs are replaced by extending U-shaped members.

Abstract: A hanger assembly for attachment to heavy loads in material handling systems such as overhead conveyors where the hanger must be angularly aligned with the conveying element such as an attached cable. The hanger includes a base, a threaded stud for load attachment, and a hanger such as the eye in an eyebolt assembly, an example of a hanger assembly. A washer positioned around the threaded stud between the base and the load is hardened substantially less than the hanger itself enabling the hanger to be rotated up to 180 degrees after initial tightening without over torquing the threaded stud. The washer has a plurality of radial slots in one face that maintain the structural integrity of the washer under high rotational and compression loading.

Abstract: This invention relates to a wheel hub and brake disc arrangement for a vehicle wheel comprising a hub mounted via a bearing on a stub axle, a brake disc non-rotatably mounted on a carrier portion of the hub and a lock ring axially fixed at an end of the carrier portion. The lock ring has a first side surface lying in contact with a surface on the brake disc and a second side surface located radially inwardly of the first side surface, the second side surface being in contact with a surface of the hub. The lock ring also has areas located radially between the first and second side surfaces which lack contact both with the surfaces on the brake disc and the brake hub. The lock ring is also provided with circumferentially spaced bosses. The lock ring permits limited axial displacement of the brake disc, relative to the carrier portion of the hub, upon axial loading of the brake disc.

Abstract: A reversible threaded fastener system which provides holding of a nut in a f ully conjoined state with respect to a bolt, yet the interrelationship therebetween is fully reversible and is accomplished without friction and without inelastic deformation. Included is a bolt having a threaded shank, a nut having a threaded bore for being threadably engaged on the threaded shank of the bolt, and a washer non-rotatably interfaced with the shank and provided with a plurality of radial washer waves. The washer is held in non-rotatable relation with respect to the bolt by the shank and the bore of the washer being mutually asymmetric. In a first preferred embodiment, the inner face of the nut is provided with a plurality of radial nut waves which correspond to the washer waves, and the washer is resiliently deformable.

Abstract: An annularly configured device for use on each earthquake restrainer cable of a bridge, which device, will deform due to its internal configuration upon the occurrence of an earthquake, if the earthquake stresses the bridge cable with which the device is associated excessively. The result of the stress is a visual indication of the cable's elongation as manifested by a "crowning" of the annular indicator and a shortening of its length. The specific configuration required of the annular member is one of a reduced thickness section of the interior wall, with tapered edges leading to the main cross section of the annular member.

Abstract: A disc brake assembly that includes a mounting bracket formed with an attachment face for engagement with the corresponding attachment face of a stationary support bracket and fixed to the stationary support bracket by way of a fastening bolt, is provided with a damping element to reduce brake squeal caused by compound vibration acting on the mounting bracket during braking operation. The damping element is positioned between the attachment faces of the mounting bracket and the stationary support bracket. The damping element can take various forms including a metallic washer covered on opposite faces with rubber members, or an annular rubber element having metallic washers adhered to its opposite faces. The damping element can also be in the form of a shim plate in which rubber plates are secured to opposite faces, or a pair of shim plates secured to opposite faces of a rubber plate.

Abstract: A Belleville spring washer (15) having an annular relief (25) depending from in its top surface (24). The relief (25) is disposed adjacent the circumferential wall (27) forming a centrally disposed opening (18) for the washer (15), the circumferential wall (27) not physically engaging the shank (37) of a fastener (39) when mounted and torqued thereon. The washer (15) includes a series of radially-extending serrations (23), each beginning adjacent the relief (25) and extending outwardly through the span (21) of the annular body (17) forming washer (15). In its mounting to a fastener (39) to be applied to a bearing surface (45), the serrations (23) face the undersurface (40) of the fastener's head (42), and the head (42) is torqued to a proper setting. The serrations (23) efficaciously bite into the head's undersurface (40), providing a tight engagement of fastener (39) to the bearing surface (45), and one which eliminates looseness in the fastener (39) upon a thermal expansion of the metal of the elements.

Abstract: A self-tensioning, disc spring assembly is provided. The assembly has a circular disc spring with an outer diameter and an inner diameter defining a center hole. The disc spring has a height greater at the inner diameter than at the outer diameter. The disc spring is also resiliently compressible such that it can be flattened. A zinc element, being zinc or a zinc alloy, is provided in the form of a ring or other shape, or a surface deposit on the disc spring or nut, to prevent rusting of the lug bolt. In addition a method of fastening a rim to a hub is also provided. The method has the steps of: positioning the rim on the hub so that the at least one lug bolt passes through the at least one mounting hole of the rim; providing a tensioning disc spring assembly on the at least one lug bolt; screwing a nut onto the at least one lug bolt to a preselected torque so that the disc spring flattens when a preselected torque amount is achieved.

Abstract: A compression clip of the present invention comprises a bolt and a self-tightening member having two side sections and a grooved intermediate section therebetween. The intermediate section has a hole for receiving the bolt. Preferably, the intermediate section has grooves on both an interior and exterior surface thereof. After tightening of the clip, the intermediate section flattens to become somewhat planar and the side sections are compressed inward to securely engage a guide rail or wear strip within the clip.

Abstract: Vehicle wheel inserts adapted to extend into the stud-receiving openings of a vehicle wheel and particularly, a non-ferrous vehicle wheel and lug nut assemblies thereof. The inserts are effectively stamped from sheet metal, and are relatively thin and light in weight. The inserts are uniquely designed so that the inserts can be permanently locked in the stud-receiving openings of the vehicle wheel. The inserts are preferably, although not necessarily, provided with a ring flange and the peripheral edge of this ring flange engages a shoulder-forming wall in the stud-receiving opening to tightly retain the insert within the stud-receiving opening. In accordance with this construction, the inserts may be provided with a depending skirt but which does not provide any locking function for securing the inserts in the stud receiving openings. Further, it is not necessary to provide any depending skirt on the insert whatsoever.

Abstract: A liveload assembly for communicating a load to packing material through a flange member of a fluid flow apparatus while pre-stressing a stud holding the flange member with a different loading, in which a first set of compressible belleville washers are received on an open-ended sleeve of a stack guide and rest on a seat defined by a flange at one end of the sleeve, the stack guide and washers received into a recess of a retainer cup having a partially closed end which defines a threaded bore for threadingly engaging the retainer cup to a stud extending from the stuffing box and freely through a gland follower, whereby the first set of belleville washers, being compressed, communicate a load through the flange member to the packing material. A second set of belleville washers are received on the stud and rest on a beveled face of the retainer cap. A nut screwed onto the stud compresses the second set of belleville washers against the beveled face of the retainer cup for pre-stressing the stud.

Abstract: A washer faced spring assembly is disclosed for a motion absorbing and motion damping application which includes a first washer having a circular or polygonal hole therethrough centered about a central axis, a second washer disposed opposite to the first washer also having a circular or polygonal hole therethrough centered about a central axis disposed generally coincident with the hole of the first washer, and a spring connected between the first washer and the second washer, the spring including a plurality of fingers providing planar or full surface contact between the first and second washers. The washer faced spring assembly may also include a base portion utilized in conjunction with the plurality of fingers, where the base portion has one of several alternative shapes, such as circular or polygonal.

Abstract: Radio noise in an automotive vehicle is suppressed by grounding the hood of the automotive vehicle with a conductive washer. The conductive washer is concave and is disposed around a rivet used to pivot a hood hinge component to a body hinge component. When the rivet is set, the hinge components compress the washer so as to permanently load the washer to thereby ensure continuous grounding of the hood to the body. Preferably, the rivet is coated with a dry lubricant, such as TEFLON.RTM., which does not flow away from the rivet to interfere with electrical contact between the washer and hinge components.

Abstract: A fastener for holding panels together includes a grommet for engaging a first panel, a stud received in the grommet, and a receptacle for securement to a second panel, wherein the receptacle includes a body having an internally threaded bore, an externally threaded barrel member in engagement with the threads of the bore, curved slots in the barrel member for receiving a cross pin of the stud, and a mechanical arrangement for selectively locking the barrel member from movement relative to the body. The grommet can include diametrically opposed slots having open ends extending through an end of the grommet for receiving the cross pin of the stud.

Abstract: An improved fastener assembly is disclosed comprising a threaded fastener combined with two disc shaped washer components wherein one disc component is resilient and mounted to relatively rotate with respect to the threaded fastener and other disc component. A dry lubricant material is provided between the disc components to facilitate the relative rotation.

Abstract: A self-centering spring hanger assembly has a housing with a top wall, a bottom wall and a central vertical wall therebetween. A coil spring adapted to receive a hanger rod is mounted on the bottom wall. A spring cap is located on the top of the spring. The spring cap has a plurality of concentric depressions adapted to receive a fastener.

Abstract: The fastening of two parts (1 and 3) to one another, e.g. of a tool or workpiece, on a holder provides that the two parts (1 and 3) to be fastened together have adjoining fitting areas (4 and 5) when in use and are braced against one another by fastening means, e.g. a single fixing screw (2), extending diagonally or at right angles to the contact plane of these fitting areas (4 and 5). In this case, in addition to the fitting areas (4 and 5) fixing the reciprocal axial position in Z direction, fitting projections (9) are provided on the one part and fitting recesses (10) on the other part which prevent the parts (1 and 3) connected and braced with one another from shifting diagonally to the fastening means within the contact plane of fitting areas (4 and 5) and which center the two parts (1 and 3) diagonally to this contact plane in X and Y direction so as to fit accurately.

Abstract: In a first embodiment of this invention, a fastener having a flat thin body with sharp profusions thereon is anchored in a workpiece so that relative rotation is prevented between the anchored fastener and the workpiece. The sharp protrusions form anchoring legs which cut into the softer material of the work piece. These legs may be spike or tack shaped, and may be forced into the workpiece by pressing or hammering in a direction orthogonal to the surface of the workpiece. For sandwich applications between pairs of workpieces, the anchoring legs may be disposed on both sides of the body. In addition, individual anchoring legs may include a sharp edge which will cut into the work piece in the rotational direction. In a second embodiment, the thin surfaces of the body may be curved so that the body of the anchoring legs is deformed by the compression of a nut being tightened on a bolt. This elastic deformation provides an axial retention force in a manner similar to a lock washer.

Abstract: An attachment member arranged to be secured to a surface of a hard receiving material by an explosive powder charge operated setting tool is formed of a fastening element (1), such as a nail, and a prestressing element (2). The prestressing element assures a sound attachment by bridging differences in the depth to which the nail is driven. To increase its surface contacting the surface of the hard receiving material, the prestressing element is laterally enclosed at least in part by a plastics material part (3) so that the pressure of the attachment member in contact with the receiving material and the danger of tilting of the setting tool relative to the receiving material are reduced. Further, a recess (3b) is formed in the plastics material part (3) to improve guidance between the prestressing element (2) and a bolt guide (4) of the setting tool.

Abstract: A fastener module includes a washer having an upper portion with a first passage defined therein and a lower portion with a second passage defined therein and communicating with the first passage. A head is mounted on the upper portion of the washer and has a shank extending downwardly from a lower portion thereof and mounted in the first passage. An annular groove is defined around a periphery of the shank and communicates with the second passage. A snapping ring is mounted in the annular groove and received in the second passage and is abutted against the upper portion of the washer.