Abstract: A package structure includes a bottom plate, a semiconductor package, a top plate, a screw and an anti-loosening coating. The semiconductor package is disposed over the bottom plate. The top plate is disposed over the semiconductor package, and includes an internal thread in a screw hole of the top plate. The screw penetrates through the bottom plate, the semiconductor package and the top plate, and includes an external thread. The external thread of the screw is engaged to the internal thread of the top plate, and the anti-loosening coating is adhered between the external thread and the internal thread.

Abstract: A threaded element (1) is designed as a cold extrusion part made of metal and has a longitudinal center axis (L). The threaded element has a thread (5) having a thread pitch angle. The threaded element (1) can be screwed to a threaded connection partner having a mating thread by rotation in a tightening circumferential direction (F) and can thereby be moved in an axial movement direction (T) oriented along the longitudinal center axis (L) onto a support portion (17) of the threaded connection partner or of a component separate therefrom. The threaded element (1) has a ring portion (8) for support on the support portion (17). An anchor (9) for interlocking anchoring in the support portion (17) to establish an interlocking connection is formed on the ring portion (8).

Abstract: A fastening structure inserts a threaded rod 11a of a bolt 11 through a fixing hole 12a of a to-be-fixed member 12 in a manner such that an end portion of the threaded rod protrudes from the fixing hole, and screwing a machine screw 15 with a proper torque into a nut 14 which is provided on the end portion via a washer 13. The washer has an inclined surface 13c formed on a first side 13b which faces the nut, and has a flat surface formed on a second side 13d. The machine screw is screwed into the nut in a direction such that an axis is orthogonal to the inclined surface 13c. The first side (the inclined surface) and the second side of the washer have a different surface roughness, and the first side has a smaller coefficient of friction than the second side.

Abstract: A sealing wedge-lock washer assembly usable in a hygienic, secure fastening system. A wedge-lock washer assembly comprises two wedge-lock components—one of which is a sealing wedge-lock washer having a wedge-lock cam and a sealing material bonded to its outer rim. The other component is a standard wedge-lock washer or a bolt whose head has a wedge-lock cam that engages the complementary cam on the sealing wedge-lock washer. The resulting sealing wedge-lock washer assembly locks a bolt in a secure joint that is hygienically sealed from the intrusion of contaminants by the sealing material.

Abstract: Methods and apparatus for preloading a bearing are provided. These methods and apparatus include preload monitoring devices whereby the mechanic can accurately monitor and regulate the preload on a bearing or bearing assembly. Aspects of the invention may also be used to adjust the endplay on a bearing or a bearing assembly. In one aspect, the preload on the bearing is transmitted through a housing having a fluid pressure that can be detected and monitored. An apparatus for precisely rotating a nut and a tool for precisely rotating a nut are also provided. A bearing retaining nut arrangement that permits the loading or evaluating of a bearing inner race is also provided. The bearing retaining nut arrangement includes a first load-setting nut, a lock washer, and a second jam nut that secures the arrangement to a shaft.

Abstract: A compression transmission collar apparatus (20) for implantation into a bone (22) with a hole (28) having a hole wall (32) comprising an intramedullary nail (34) defining a bore (40) and a threaded fastener (42) and a compression transmission collar (58) including an exterior face (64) and a top edge (60) and a bottom edge (62) and a first end (70) intersecting the top edge (60) at an acute angle and the bottom edge (62) at an obtuse angle and a second end (72) intersecting the top edge (60) at an obtuse angle and the bottom edge (62) at an acute angle and the first end (70) partially overlapping and opposing the second end (72) to define a slit (74) such that applying a compressional load to the top edge (60) causes the first end (70) to slide relative to and along the second end (72) causing the compression transmission collar (58) to compress axially and expand radially pressing the exterior face (64) against the hole wall (32).

Abstract: A method of securing a composite plastic part to an engine with a bolt or a bolt and washer. The bolt has a head including teeth that are adapted to engage either the part or the washer. The bolt is tightened to cause the teeth to compress the surface of the part to resist rotation that may become loosened as a result of vibration of the engine. The part may be an intake manifold, a cam cover or an oil pan. Locking features, such as teeth, may be provided on the clamping surface of the bolt and on both surfaces of the washer. Alternatively, a knurled or serrated surface may be provided instead of the teeth.

Abstract: The present invention relates to a self-locking bolt-nut assembly including a bolt; a nut tightened on the bolt; and a washer provided between the bolt and the nut, wherein the nut has a counterbore being formed in the nut, and has a plurality of stop protrusions formed on the inner surface of the circumferential sidewall of the counterbored portion of the nut, the stop protrusions being arranged in a circumferential direction at regular intervals, the washer including the rotation-preventive protrusion protruded on inner circumference of the washer towards the center thereof, the rotation-preventive protrusion being inserted into the insertion guide groove; and a plurality of elastic protrusions which is protruded on outer circumference of the washer, being inclined in the direction where the nut is turned to tighten it.

Abstract: A fastening assembly includes a fastening screw and a fastening assembly. The fastening screw includes a head section having multiple first tooth elements at a lower surface thereof, and a screw fastening section at a lower portion thereof for fastening into a work piece. The fastening accessory includes multiple second and third tooth elements at upper and lower surfaces thereof, respectively, multiple grooves formed between the second tooth elements, and an embedding recess at an upper portion thereof. The fastening accessory is accommodated at a lower portion of the fastening screw to lodge the first tooth elements into the embedding recess, such that the fastening accessory is closely fastened to the lower portion of the fastening screw. The third tooth elements are engaged to a surface of the work piece to allow both of the fastening screw and the fastening accessory to become closely fastened to the work piece.

Abstract: A tensioner for a strap brace comprising: a cap for receiving a fastener and a strap brace, wherein the fastener secures the strap brace to the cap; the fastener comprising first and second members with interengageable threads, wherein either can be turned to bring the strap brace under tension; and a frictioned surface to prevent rotation of the other member when one member is turned.

Abstract: Fastening devices are disclosed herein with variations on how said devices resist loosening or un-fastening from a structure or structures. In some examples, the fastening devices accomplish the removal resistant condition by using a spring component engaging ridged surfaces. The spring component generally consists of a spring ring conveniently coiled to a canting position. One exemplary design is characterized by incorporating a screw element with its head underside surface being ridged and a lock element with a ridged topside surface and engaging the two ridges surfaces. Another exemplary design is characterized by a screw element having a head outer sidewall being ridged for cooperating with a bore having a ridged inner sidewall. The bore can be part of a first body or structure or a lock element.

Abstract: An anti-unscrewing device for coupling the tubular ends of two components in fluid conveying or delivery systems by means of a threaded ring nut that can be screwed to one of said tubular ends to connect said ends, wherein said anti-unscrewing device comprises a connecting portion to connect the device to one of the components and at least one counter element provided with an engaging portion suitable to engage a corresponding engaging surface formed at said ring nut, such that the engaging portion can be displaced by means of a movement of the ring nut. There are further provided guide means dictating a movement path for the counter element, such that an unscrewing movement of the ring nut will cause the engaging portion to move to a locking position relative to the ring nut thereby preventing the ring nut from unscrewing.

Abstract: A novel plastic fastening device is provided herein, which mainly contains a bolt, a nut, and at least a washer. On the surface of the washer that interfaces with the object being fastened, a number of small wedges are arranged radially with equal spacing therebetween. Inside at least one of the small wedges, a plate is embedded vertically with a saw-toothed edge facing towards the object being fastened. When the bolt and nut are screwed together and the small wedges on the washer are pressed against the object, the pointed edges of the small wedges are deformed, and the saw teeth of the embedded plate is exposed and driven into the object for a superior fastening effect.

Abstract: A washer for a threaded fastener assembly and a threaded fastener assembly incorporating such a washer. The washer includes a body having a central axis including two opposed sides an outer periphery and an inner periphery defining a central aperture extending between the two opposed sides. The body incorporates an engaging face for frictionally engaging a component of the threaded fastener assembly or a work-piece. A ramp structure extends angularly between the inner periphery and one side for interacting with a further component of the threaded fastener assembly to provide a mechanical connection therebetween for resisting unthreading of the threaded fastener assembly. The engaging face is associated with the other side and extends circumferentially about the central axis. The relative positions of the engaging face and the ramp structure with respect to the central axis is such that in use torque transferred through the engaging face is greater than torque acting through the ramp structure.

Abstract: A fastener has a body and a cage with cam surfaces formed on interengaging components to inhibit relative rotation. In one embodiment a washer is interposed between said surfaces and has oppositely directed faces with cam surfaces formed on them. In a further embodiment, the underside of the cage has serrations formed on it.

Abstract: An apparatus for reducing the bending stress imparted to threaded fasteners in flanged connections is disclosed. The apparatus includes a radially tapered surface machined in the backface of the flanges to coact with the head of the threaded fastener as the threaded fastener is tightened to a predetermined torque value. This coaction compensates for flange deflection as the threaded fastener is tightened.

Abstract: An apparatus for joining two flowlines, one having an external flanged end and the other an enlarged flaring portion at one end. A ball with an axial flow passage is seated in receptacle cavities formed in said ends and in fluid-tight sealing engagement therewith. A collar is sleeved and clamped about the flared end of the second flowline by bolts which connect the first flowline flange with the collar. Piston drive means are provided for driving against the collar to stretch the bolts by an amount sufficient to release the second flowline member and allow limited articulated movement of the second flowline without compromising the seal effectiveness of the joint.

Abstract: A safety device used in preloading of bolts for providing the bolts with an internal stress in a mounted condition, wherein a first end of the bolt is secured to a first element and extends through a second element, which clamps to the first element, and where a hydraulic preloading device is temporarily applied to a second end of the bolt for axially stretching the bolt to create the external stress. The safety device incorporates a safety tensile bar detachably fitted to the first end of the bolt, and extending through a central bore in the bolt, and further through the hydraulic preloading device while being held adjacent its opposite end in an expanding plug. The expanding plug is provided in a frictional contact with a sleeve, which guides the plug to create a counter hold for absorbing relieved energy in case of the breaking of the bolt during the preloading operation.

Abstract: A heat exchanger, particularly with an integrated oil heat exchanger, has screw-in connectors. Each connector is secured to the exchanger using a retaining ring, which has finger forming projections. The heat exchanger has an annular collar with circumferentially spaced teeth on its inner circle. The fingers engage the teeth. The fingers and the teeth are arranged to prevent the connector from being unintentionally unscrewed or loosened by virtue of the connector being secured by the retaining ring.

Abstract: An annular closure ring for securing a cover in sealed relation over the open upper end of a cylindrical storage drum or similar container is disclosed in which a split ring is closed about the periphery of the drum and its cover by tightening a headed tie bolt between a pair of laterally spaced lugs fixed to the split ring on opposite sides of the split therein; one of the lugs having a threaded opening therethrough for engagement with the threaded body of a headed tie bolt and the other lug having an enlarged opening therethrough for free passage of the bolt body.