Abstract: A fastening device for fastening a shielding part to a partnered fastening part, having: a sleeve with a through opening for a fastener; at least two bridging elements, which are equipped with outer regions in a radial direction for indirect or direct contact with the opposing outsides of the shielding part and are fastened to the sleeve with inner regions in the radial direction; a damping element is positioned between the bridging elements in an axial direction and outside of the sleeve in the radial direction, characterized in that the damping element is embodied as a spring element and has at least one spring arm, which is resiliently flexible in the radial direction and is equipped to cooperate in a supporting way with a hole rim of a hole of the shielding part.

Abstract: Bone compression systems for internal fixation of bone portions include one or more spring washers having ultra high load capacity and ultra low displacement to close diminution gaps that develop in a discontinuity between the bone portions after fixation. The spring washers, individually or in stacks of up to four, provide installation loads between 1500 N and 4000 N. After closing diminution gaps, the spring washers or stacks provide sustained loads between 1000 N and 3000 N which stabilize the bone portions sufficiently to permit early load bearing. The sustained loads correspond to sustained average local bone stress just below the bone growth trigger threshold stress. The additional loads of early load bearing will create average local bone stress above the bone growth trigger threshold. By bone stress repeatedly passing through the bone growth trigger threshold stress, bone healing is optimized.

Abstract: The invention is a rocker for therapeutic treatment of a user by control of actuators in the rocker and sensing biometric and mechanical conditions of and around the user. The rocker may be formed of a unitary body of translucent or transparent material. The body of the chair features a single tail floor engagement portion and a user area of seat and back. The rocker may have actuators mounted in or near the rocker to generate heat, sound, vibration or light, Sensors in and around the chair monitor movement of the rocker and biometric conditions of the user. A control panel in communication with the actuator and sensors controls and monitors conditions and communicates with a monitoring computer for storage and reporting. Predetermined patterns of actuator activation may be programmed into the computer for transmission and execution by the control panel.

Abstract: To provide an ultrasonic flowmeter that prevents reduction in S/N ratio by suppressing the movement of a damping material applied to the pipe of the ultrasonic flowmeter, an ultrasonic flowmeter is provided. The ultrasonic flowmeter includes a first ultrasonic transceiver provided on a part of an outer periphery on an upstream side of a pipe in which gas flows, the first ultrasonic transceiver transmitting and receiving an ultrasonic wave, a second ultrasonic transceiver provided on a part of the outer periphery on a downstream side of the pipe, the second ultrasonic transceiver transmitting and receiving an ultrasonic wave, a main unit measuring a flow quantity of the gas, an ultrasonic absorber provided on the outer periphery of the pipe, the ultrasonic absorber including a first rubber layer formed on the outer periphery of the pipe and a second rubber layer formed on the first rubber layer.

Abstract: An apparatus comprises a metal washer having an outer circumference, a plurality of cavities formed within the washer, wherein each cavity has an opening that is flush with the outer circumference, an indicator material comprising an inspection lacquer within at least one of the cavities, and a membrane along the outer circumference sealing the inspection lacquer within the cavity.

Abstract: A flexible fastening device having multiple segments, one or more of which are flexible and one or more segments that also include threads. The flexibility is created through the use of at least one helical slot formed generally in the center segment of the element. Additional flexible segments also have at least one helical slot in either the same helical rotation and pattern or in an opposite rotation and/or different pattern. An elastomeric material can fill the hollow body, extend into the slots and/or encompass the exterior. The flexible fastening device can have a hollow body, including leading and trailing edge, or can have a partially hollow body.

Abstract: A bolt sleeve for insulating a bolt or machine screw, wherein the bolt sleeve is so embodied that it axially shortens by a predetermined amount in the case of a force of predetermined size acting axially on it, whereupon the bolt sleeve assumes at least partially the shape of a bellows.

Abstract: According to one embodiment, the electronic device of this embodiment includes a module, a first plate which has a first surface and a second surface, the first plate supporting the module, a cover which includes an attaching surface that is attached to the first plate, and an engaging part that includes a tip part, a second plate which is attached to the first plate from a side of the second surface and fill a space between the second surface and the tip part, the second plate being engaged with the engaging part and fixing the cover onto the first plate, and a fixing member which fixes the second plate onto the first plate.

Abstract: A system configured to anchor a cover plate over an interface formed between substantially coplanar substrates includes a sleeve capable of being anchored in a first substrate; a spring located in the sleeve; a post located in communication with the spring; and a fastener secured onto the post. A head of the post is located in the sleeve, and an end of the post opposite the head of the post extends out of the sleeve to receive the fastener. The fastener is secured onto the post over the cover plate located on the first substrate such that the cover plate extends over the interface formed between the first and second substrates when they are positioned to be substantially coplanar.

Abstract: A fastening structure of a resin roof panel is disclosed for fastening a sunshade housing thereto. The sunshade housing includes an attaching portion. The roof panel includes coupling portions. The attaching portion and the coupling portions are fastened to each other by combined members. Each combined member is formed by combining a fastening bolt and a plate spring, and is inserted in an elongated hole. Each combined member permits the attaching portion and the associated coupling portion to be relatively displaced along the longitudinal direction of the elongated hole, and permits the attaching portion and the associated coupling portion to be relatively displaced along the axial direction of the fastening bolt through elastic deformation of the associated plate spring.

Abstract: A vehicle and a compression load limiter assembly for the vehicle are disclosed. The assembly includes a first component defining a first hole along a first axis to present a first wall radially spaced from the first axis. The assembly also includes a second component defining a second hole along a second axis to present a second wall radially spaced from the second axis. The first and second holes generally align with each other to couple together the first and second components. The assembly further includes a load limiter member including a first body portion engaging one of the first and second walls when disposed in one of the first and second holes. The first body portion has a radially compliant feature to allow movement of the load limiter member within one of the first and second holes in response to a force being applied to the load limiter member.

Abstract: A fastening socket B includes an inner socket portion including engaging means for engaging a nut or the like, and an outer socket portion for engaging a washer A with an outer edge portion 2, which includes a tapered surface and engaging teeth. The tapered surface is gradually inclined outwardly and toward a bottom surface of the outer edge portion. The inner socket portion 21 and the outer socket portion 22 are coupled together with a mechanism so as to be rotated in opposite directions. The outer socket portion is provided with engaging claws for engaging the engaging teeth, and a tapered bottom end surface of each of the claws 24 is gradually inclined radially inwardly and toward a base end side. A surface of a bolt head that is brought into contact with a surface of objects is provided with frictional coefficient increasing treatment.

Abstract: An assembly for use in a gas turbine engine has an underlying metal sheet, and at least one ceramic matrix composite tile attached to the underlying metal sheet with at least one fastener assembly. The panel fastener assembly includes a fastener having a threaded portion extending rearwardly from a head, which has a frustoconical surface facing the threaded portion. The frustoconical surface is received in a frustoconical bore in the ceramic matrix composite panel. A bushing is positioned on an opposed side of the metal sheet from the ceramic matrix composite panel. The bushing has a flange extending away from the metal sheet. A sleeve is received about the threaded portion of the fastener, and extends away from the panel, beyond the metal sheet. The sleeve has a lip extending radially outwardly toward the flange on the bushing, such that the flange on the bushing extends beyond a space defined between the lip and a seating surface on the bushing. A wave spring is received within the cavity.

Abstract: An exemplary heat dissipation device includes a fan having fixing cylinders, a heat sink having a supporting board, and fasteners fixing the fan to the heat sink. Each fastener includes a screwing pole, a first elastic member and a second elastic member encircling the screwing pole, and a fastening cylinder engaging with the screwing pole. Each screwing pole includes a head, a shaft extending coaxially downwardly from the head, and a post extending coaxially downwardly from the shaft. For each fastener, the screwing pole extends through a corresponding fixing cylinder of the fan, the first elastic member is compressed between the head and the corresponding fixing cylinder, the second elastic member is compressed between the corresponding fixing cylinder and the fastening cylinder, and the post protrudes from the fastening cylinder and is engaged with the supporting board.

Abstract: A locking screw for connecting two or more articles together is provided. The screw includes an externally threaded shaft, a head, and an elastic member. The head defines a chamber in which a spiral groove is defined. The shaft extends from the bottom of the chamber; and the elastic member is arranged around the shaft and one end of the elastic member is received in the spiral groove of the chamber and another end abuts against an article. The elastic member can be rotated around the longitudinal axis of the shaft, to change the length of the elastic member, so that enough tension is created to ensure locking the screw in place and prevent any rotation, thus maintain a tight engagement among the articles.

Abstract: A fastening device comprising at least one nut, at least one support unit, and at least one spring element, with the nut, the support unit, and the spring element being constructed and matched to each other in such a way that the spring element exerts a force between the nut and the support unit.

Abstract: A fastener assembly includes a bushing having a flange configured to be urged toward a work-piece, and an isolation spring configured to be positioned between the flange and the work-piece. The isolation spring includes a metal core integrally formed with a rubber coating.

Abstract: An injection molded part accommodates a threaded fastener and includes a metal insert. The insert defines a longitudinal axis and has an end face and an outer peripheral surface. A cutout extends from the end face and through the insert to permit the threaded fastener to extend therethrough. A plastic body surrounds the outer peripheral surface and has a threaded fastener contact face. The threaded fastener contact face of the plastic, body is recessed at a recessed distance below the end face of the insert which has a spring constant with respect to the longitudinal axis. The recessed distance and the spring constant are selected to deform the insert in response to a stress force applied to the end face thereof by the threaded fastener to cause a pregiven component of the stress force to be introduced into the threaded fastener contact face of the plastic body.

Abstract: Self-locking nuts help prevent the nut from backing off of a spindle or other type of threaded shaft. A single piece nut assembly is provided that is self-locking and comprises a nut subassembly and a washer subassembly. Nut and washer subassemblies are secured together, and do not require any special tools for installation or removal. The washer has an edge which is formed/rolled over a lip extending from the bottom edge of the nut when assembled to provide the unitized assembly. The nut and washer are held apart by a spring, such as a wave spring, until the washer contacts the face of the object to which the nut is being secured. At this point the spring is compressed to engage the nut with the washer, and engage holding elements located in the nut with a holding feature located on the washer and prevent movement between the washer and nut.

Abstract: The invention is an adapter and a method for securing a silencer/suppressor to the barrel of a firearm. The invention incorporates a uniformly deformable spring washer positioned within a cavity within the adapter. The cavity communicates with an opening in the silencer/suppressor into which the discharge end of the barrel of the firearm is fitted. As the silencer/suppressor is secured to the discharge end of the barrel of the weapon, the uniformly deformable spring washer is deformed uniformly, locking the silencer/suppressor together with the barrel of the weapon, and preventing the silencer/suppressor from separating from the barrel.

Abstract: An annular two-phase spring has a plurality of first waves providing a first spring rate and a plurality of second waves providing a second spring rate. The two-phase spring can be used for installing a fuel injector in a fuel injector bore to improve sound performance.

Abstract: An electronic device includes an enclosure and a number of screws. Each screw includes a bolt, a head, and a shock-absorbing gasket encircling the bolt. The gasket is made of flexible shock-absorbing material. A top surface and a bottom surface of the shock-absorbing gasket are both wave-shaped. The gasket defines a through hole in a center. A number of flexible protrusions extend from an inside wall of the gasket bounding the through hole. The protrusions press against the bolt of the screw.

Abstract: A fastener assembly includes a bushing having a flange configured to be urged toward a work-piece, and an isolation spring configured to be positioned between the flange and the work-piece. The isolation spring includes a metal core integrally formed with a rubber coating.

Abstract: A washer (14) and a threaded assembly (22) between a screw (30) and a workpiece (42) are provided. The washer (14) is offset up to an angle (?) with respect to a flat initial state, such that the washer has an insert thickness (De) that is substantially greater than the initial thickness (Da) thereof. The washer (14) is made of a malleable material. The length (Lg) of an unthreaded shank section (40) of the screw (30) is smaller than the sum of the thickness (Dw) of the workpiece (42) and the insert thickness (De) of the washer (14), and essentially not smaller than the sum of the thickness (Dw) of the workpiece (14) and the insert thickness (Da) of the washer (14). When the last thread of the screw (30) leaves the workpiece (42) on being screwed in, the force previously exerted on the washer (14) by the feed of the screw is zero.

Abstract: The disclosed system, device, and apparatus for a locking element generally includes a force device having a suitable shape to fit around a plurality of coupled elements. This re-usable force device reduces unwanted and unintended rotation of coupled elements. Disclosed features and specifications may be variously controlled, adapted, or otherwise optionally modified to realize improved locking function.

Abstract: The present invention relates to a mounting structure for mounting firmly onto a rotating shaft a rotational force transmission member such as a chain sprocket, a gear, a belt pulley and the like. A drive sprocket as a rotational force transmission member is fitted into an end of the rotating shaft in a splined manner. A coned disc spring and a washer are positioned in sequence onto an outer face of the rotational force transmission member. The coned disc spring and the washer are supported and sandwiched by the screw fastening member to be screwed to an end of the rotating shaft and the rotational force transmission member.

Abstract: Several embodiments of reactive biasing fasteners are described. The fasteners are utilized in place of jam nuts and Belleville washers providing for the storage of a pre-load and effectively providing a locking function to prevent unintended loosening of an associated bolt. The embodiments resiliently deform under load to store pre-load or live load energy. Further, the fasteners provide a means for interfacing with a self-reacting tightening power tool thereby eliminating or minimizing the need for reaction arms. Additionally, several embodiments through the incorporation of a threaded bore effectively act to create a substantially torsionless live load on the portion of a bolt located in the bolt hole of a workpiece when in use. The resilient deformation of the biasing fasteners permits the live load to be stored therein and accordingly lessens the risk of loosening of the bolted joint due to exteriorly applied forces such as but not limited to vibration and thermal expansion and contraction.

Abstract: It is intended for joining two pieces (1 and 2) that are in contact with each other via their respective inner faces (3 and 4), with one of them having a blind threaded hole (5) in which is coupled a first threaded end segment (6) of a bolt (7) which includes an annular extension (9) that limits the tightening rotation of the bolt (7) with the interposition of a characteristic elastic washer (8) as means for immobilizing the bolt (7) preventing it from coming loose. The other piece of the pair includes through holes (13) in correspondence with each of which is housed a section (11) of the respective bolt (7), projecting out of which said piece is a second threaded end segment (14) of the bolt (7), in which segment is coupled a self-locking nut (15) which fixes the two pieces together.

Abstract: A laminated nut having a plurality of conical spring discs for use with a bolt assembly. Each of the discs is formed with a hex shaped outer periphery and a non-round central bore. The discs are assembled on top of each other forming a laminated stack. A threaded tension sleeve is located in the central bore and has a non-round outer periphery shape corresponding to the shape of the central bore of the discs. The tension sleeve has a threaded inner peripheral wall with the threads sized to fit the bolt assembly. The tension sleeve includes an upper flange to engage and hold the upper portion of the laminated stack and a lower flange to support the laminated stack. Application of a torqueing force to the outer, hex shaped periphery of the discs forces them to deflect and contact the threaded tension sleeve applying force along the length of the bolt assembly in a uniform manner to reduce clearance between the bolt threads and the threads on the nut tension sleeve.

Abstract: A washer (14) and a threaded assembly (22) between a screw (30) and a workpiece (42) are provided. The washer (14) is offset up to an angle (?) with respect to a flat initial state, such that the washer has an insert thickness (De) that is substantially greater than the initial thickness (Da) thereof. The washer (14) is made of a malleable material. The length (Lg) of an unthreaded shank section (40) of the screw (30) is smaller than the sum of the thickness (Dw) of the workpiece (42) and the insert thickness (De) of the washer (14), and essentially not smaller than the sum of the thickness (Dw) of the workpiece (14) and the insert thickness (Da) of the washer (14). When the last thread of the screw (30) leaves the workpiece (42) on being screwed in, the force previously exerted on the washer (14) by the feed of the screw is zero.

Abstract: A method of assembling an Application Specific Integrated Circuit (ASIC) assembly with attach hardware includes selecting a thickness of a load washer based on a target load to be applied by said attach hardware.

Abstract: A hydraulic unit is elastically supported by means of elastomer elements, through which bolts pass, on two legs of a mounting bracket that extend perpendicular to one another. The leg of the mounting bracket has recesses, open counter to the mounting direction of the unit, for receiving the elastomer element. With clamping means disposed on the bolt, the elastomer element is axially shortened and pressed against both the recess and side faces, located on either side of the recess, of the leg of the mounting bracket. With the shortened elastomer element, a positive and nonpositive engagement with the leg of the mounting bracket is achieved.

Abstract: An apparatus for dissipating heat in a computer system includes a heat sink, at least one fastener which secures the heat sink to at least one first support member, and at least one cup. The first support member has a top side and a bottom side. The at least one cup includes a cylindrical cavity, an upper protruding lip, and a lower base having a hole through which the at least one fastener passes. A method for dissipating heat in a computer system includes, mounting a heat emitting component onto a printed circuit board, pressing a heat sink into thermal contact with a heat emitting component, inserting a cup into an aperture of the heat sink, and supporting a heat sink.

Abstract: A method and apparatus for determining fastener axial loading includes a fastener insert having an arched bottom surface, which deflects correlative to the level of axial loading. A load indicating mechanism determines axial loading by measuring the amount of deflection experienced by the arched insert. In addition, the arched insert stores elastic energy that is added to the overall elastic energy of the fastener, thereby aiding the fastener integrity during use. A graduated load gauge is moveable to engage a load reference pin with the degree of movement corresponding to the degree of loading experienced by the fastener insert.

Abstract: An axially acting undulating washer or wave-shaped spring consisting of a closed annular member which comprises a central X-axis and which is periodically wave-shaped across the circumference, wherein a wave line extends so as to monotonically rise or fall between a plurality of identical minima and identical maxima and wherein in the minima and maximum of the wave line there are formed contact points of the annular member relative to axis-normal contact faces, wherein, starting from each minimum and maximum, the annular member, on both sides, i.e. in each circumferential direction, comprises at least two wave line portions which directly adjoin one another and which, with an increasing axial load, are individually flattened and made to contact and contact faces one after the other.

Abstract: A device for joining a first component A and a second component B while leaving a joining gap SP includes a bolt 4 and a compensating coil 2 for compensating tolerances of the joining gap. The compensating coil is adapted to be fixed to the bolt 4 by frictional engagement means and/or releasable positive engagement means. The dimensions of the compensating coil are adapted to a helical rim hole portion 6 of the first component A such that actuation of the bolt 4 causes the compensating coil to rotate through the helical rim hole portion until it fills the joining gap for the purpose of tolerance compensation, and the frictional engagement means and/or releasable positive engagement means is overcome by further actuation of the bolt 4 so that the bolt can be screwed into a threaded hole of the second component B to join the two components.

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 conical washer having a crush zone wherein the inner annular projection comprises a top and bottom elevation where the top elevation lies at an approximately 100 to 165 degree angle to the inner annular wall of the washer and the bottom elevation is substantially flush with the bottom surface of the washer. The inner annular projection forms a crush zone, which collapses and crushes when an attachment device passes through the washer and is tightened down by a user. The crush zone provides a tight engagement of fastener to the bearing surface, and one which eliminates looseness in the fastener upon thermal expansion of the metal of the elements.

Abstract: A self-locking fastening device which includes a screw or nut for fastening at least one first part to a second part and a shim (10) which is provided with a central borehole (11). The two surfaces of the shim (10) include rib profiles (12,14) which are fixed within or to the surfaces of the first part and the screw or nut no later than the time that the fastening device is tightened such that self-actuated unscrewing is prevented. The shim (10) is configured in a resilient manner such that the shim (10) can be compressed counter to the resilience thereof during tightening of the fastening device.

Abstract: In a bracket mounting structure is disclosed for mounting a bracket holding a center bearing of a propeller shaft to a vehicle body member by bolts and nuts. The structure contains a bush collar formed in a cylindrical shape having a flange in an upper end, fitted to the bolts and fixed to the vehicle body member by the bolts and the nuts. It also contains a pair of upper and lower rubber bushes fitted to an outer periphery of the bush collar and gripping the bracket there-between, and a washer provided in a lower end of the lower rubber bush among the rubber bushes. An outer peripheral edge of a lower end of the bush collar extends all through an inner peripheral edge of the washer and is expanded outward in diameter.

Abstract: A method and apparatus for determining fastener axial loading includes a fastener insert having an arched bottom surface, which deflects correlative to the level of axial loading. A load indicating mechanism determines axial loading by measuring the amount of deflection experienced by the arched insert. In addition, the arched insert stores elastic energy which is added to the overall elastic energy of the fastener, thereby aiding the fastener integrity during use. The system comprises a zeroing mechanism and full-scale adjustment mechanism for calibration of the system, and an apparatus for measuring in-service load.

Abstract: A grommet bridge assembly includes a grommet bridge having at least one grommet-receiving aperture disposed therein and a plurality of grommets. Each of the grommet-receiving apertures is shaped for engaging at least a portion of one of the grommets. The grommet bridge assembly also includes a fastener-receiving aperture and an elongated fastener that is fitted through the fastener-receiving aperture and fitted through one of the grommets. At least a portion of each of the other grommets is received in each of the grommet-receiving apertures.

Abstract: An arrangement for cooling or heating of a flange bolt for turbines comprises one or more boreholes, that extend through the bolt, and inlet and outlet pipes that are connected to each end of the borehole. A cooling or heating medium such as air, steam or any other fluid flows through an inlet pipe into and through the borehole thereby cooling or heating the bolt, and exits from the borehole via an outlet pipe. The cooling or heating arrangement enables direct cooling or heating of the bolt itself and ensures stable bolting forces throughout the operation of the turbine. The flange bolts with this arrangement may be applied to gas turbines or steam turbines operated at elevated steam temperatures and pressures.

Abstract: Roof bolt bearing plate and method are disclosed for use in underground mining operations. A dome-shaped roof bolt bearing plate and method support the roof in a mine. The bearing plate is round or elliptical different from conventional commercial roof support devices. No dangerous edges and corners protrude downward. A recessed center is lower than the outer rim. A thin outer rim conforms to roof irregularities. The roof bolt bearing plate and method have been found to provide important advantages over conventional commercial roof support devices, including (1) concealing the head of the roof bolt to a preferred degree, (2) conforming to the roof's irregularities which will cause causing the plate to remain tight, (3) provide readability so the installer can to determine the quality and integrity of installation and anchorage, and (4) compressing the lower strata of the mine roof, thereby and creating a beam like support for the upper layers of the mine roof.

Abstract: A ground washer is disclosed for attachment by a grounding screw to a grounding terminal. The washer device includes a disc-shaped member which defines an opening for the reception therethrough of the grounding screw. The member has an annular portion having a first and a second surface, the annular portion surrounding the opening. The annular portion cooperates with a plurality of teeth extending from the grounding terminal towards the annular portion of the member. A conical portion having a first and a second end, is disposed concentrically around the annular portion. A raised annular ridge is disposed between the annular portion and the conical portion, the ridge cooperating with the grounding screw such that when the grounding screw is turned, the ridge urges the annular portion into contact with the plurality of teeth of the grounding element. An annular flange is disposed concentrically around the conical portion, the flange mating with the grounding terminal.

Abstract: An assembly of an internally threaded fastener and a stemmed washer is provided, such as for applications in which a standoff is desired between a washer and a mating externally threaded fastener. The stemmed washer includes a washer portion, a retaining portion and a standoff portion. The washer portion is angled relative to the standoff portion. The angle of the washer portion to the standoff portion may be varied to change the effective length of the standoff portion. The retaining portion interfaces with the internally threaded fastener to retain the fastener in the assembly. The stemmed washer may include a skirt that is plastically deformed to capture the fastener. The fastener may include a skirt which similarly plastically to mate with a retaining lip on the stemmed washer. The fastener and washer may be secured in the assembly to permit relative rotation of the fastener with respect to the washer.

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 plurality of latches are employed for detachably holding a semiconductor wafer to a ring support during processing. Each latch is rotatably mounted on a post which is secured to the ring so that it can move to engage and disengage the wafer, alternately clamping and releasing it from the ring. Each latch has two opposed rollers, one to engage and disengage the wafer and the other to engage the ring. The latches should be freely rotatable into and out of engagement with the wafer. The ring usually has two pairs of opposed dimples such that each roller is in registration with each of the opposed dimples of each pair when it rotates from the engaged to the disengaged position and visa versa. The dimple in registration with the roller when engaged the wafer is sufficiently deep so that the roller does not touch the ring when clamped to the wafer.

Abstract: A heat sink fastener includes a locating bolt having a compressible barbed tip for securing the heat sink to the circuit board, and a buffer spring mounted on the locating bolt and adapted to force the heat sink downwards into close contact with the CPU at the circuit board, the buffer spring has a top ring defining a top receiving space, a bottom ring defining a bottom receiving space, and a double conical spiral spring body connected between the top ring and the bottom ring and receivable in the top receiving space and the bottom receiving space when compressed.

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.