Abstract: A sacrificial washer has a longitudinal central axis and comprises a cup and a cap. The cup includes a cup base wall extending transversely with respect to the axis, a cup radially outer wall extending outwardly away from the cup base wall, and a cup inner diameter. The cup includes a cap base wall extending transversely with respect to the axis and spaced axially away from the cup base wall, and a cap radially inner wall extending inwardly away from the cap base wall and having a cap inner diameter.

Abstract: A cover (30) for concealing one or more components (20) of a power tool (10) presented herein. The cover (30) can include a through recess (52) between an inner surface (702) and an outer surface (708). The through-recess (52) being arranged for receiving a threaded member (80) protruding from the tool (10) and extending between an inner opening (704) at the inner surface (702) and an outer opening (706) at the outer surface (708). A threaded nut (60) for engaging the threaded member (80) for tightening the cover (30) to the tool (10) can be included. Additionally, the threaded nut (60) can be attached to the cover (30). The nut (60) can include a radially protruding portion (70) with a larger radius than the inner opening (704) and outer opening (706). The cover (30) can have opposing first and second shoulder portions (712, 714) surrounding the inner opening (704) and outer opening (706).

Abstract: In some embodiments, an apparatus includes a housing and a purge valve. The housing defines a cavity and a lumen extending from a volume of the cavity to a volume outside the cavity. The purge valve is disposed within the lumen and includes an occlusion member. A portion of the occlusion member has a width substantially equal to a width of an end portion of the lumen such that the portion of the occlusion member is disposed within the end portion of the lumen when the purge valve is in a first configuration. The portion of the occlusion member being disposed outside the end portion of the lumen when the purge valve is in a second configuration.

Abstract: A screw with anti-loosening means, which includes a securing element with a ring portion and that can be inserted about a shaft of the screw under a head thereof and, with the screw in a state in which it is screwed on a base, prevents the screw from being turned back counter to a screwing-in direction. The securing element has on the ring portion, on a side facing the surface of the base, at least one projection which can be pressed into the surface when screwing in the screw. The securing element can have an outer circumferential region of the ring portion, with finger-like extensions which, with the securing element in the inserted state, extend along the circumference of the head and under spring-elastic forces of the securing element, contact a surface structure of the body that has an inhibiting action counter to the screwing-in direction.

Abstract: Methods and systems for an integrated captive fastener system is provided. A system includes an integrated nut assembly configured to be tethered to a first structure, the nut assembly including at least one of a lock washer and a flat washer coupled to a nut using a retainer, and a bolt configured to be tethered to at least one of the first structure and a second structure, the nut assembly configured to be threadably couplable to the bolt.

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 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: The present invention relates to a fastener assembly, comprising a nut provided with a plurality of threads, a torque transmitter shaped to transmit torque to the nut, and an annular surface that is undulating in shape, a washer provided with a clamp surface and a bearing surface that is undulating in shape and axially opposed to the annular surface on the nut, and a spring member located between the annular surface on the nut and the bearing surface on the washer.

Abstract: A washer adapted to minimise contamination by avoiding in use inappropriate crevices. metal annular disc having an annular rebate on at least one face to its outer periphery, and a unitary formation of a flexible medium (e.g. of a food grade rubber) (A) preferably more than filling the or each rebate and (B) surrounding the outer periphery of the disc.

Abstract: An aluminum enclosure of an electronic device is used in a corrosion environment. A long-term low impedance ground connection is needed because of security and EMC reasons. While common surface protection for aluminum in corrosion environments as for example polyurethane paint is not conductive, a stainless steel connector is provided which comprises a head portion and a bolt portion. The bolt portion is inserted into a bore of the enclosure or frame. An annular rib provided on the back side of the head portion defines a cutting edge which cuts into the surface of the aluminum enclosure and provides a gas-tight electrical contact. The front surface of the stainless steel head of the electrical connector element provides a metallic surface for connecting ground wires or other conductors.

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: An engine-supporting structure for a motorcycle, in which a collar can be removed to perform engine maintenance, and can be suitably re-mounted after the completion of maintenance. The engine-supporting structure supports a rear upper mounting portion of an engine, on left and right pivot plates, by providing left and right upper engine-supporting frame portions at central areas of the respective pivot plates. interposing a left upper collar between a left upper engine-supporting frame portion and a rear upper mounting portion formed on an engine, interposing a right upper collar between the right upper engine-supporting frame portion and the rear upper mounting portion formed on the engine, and coupling the left and right upper engine-supporting frame portions, the left and right upper collars, and the rear upper mounting portion by a rod-shaped member.

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: 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 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 screw spindle of a swivel chair according to the present invention comprises a spindle which is placed in an outer case; an elastic body which is placed in the spindle; a bearing support which is placed in the spindle; a ball bearing component which is placed in the spindle; a screw nut and a clutch, each having a corresponding furrow and ridge with curved surfaces, which are placed in the spindle; a screw shaft which is placed in the spindle; a fixer and a clip which hold the screw shaft in place; and a stopper which is formed at the screw shaft and limits the height of the seat; a spindle bushing located between the screw shaft and the elastic body. The screw shaft further includes an idling protection component and a fixing end, and the fixer includes an idling protection hole corresponding to the idling protection component.The screw spindle of the present invention has the following advantages.

Abstract: A structural interlock (40) for inhibiting relative rotation between mating elements (20, 42) characterized by a plurality of grooves (50) being formed in one of the mating elements, and a mechanism (60) for producing a nominal contact pressure on the contact area (A.sub.1 thru A.sub.8) between the mating element, which contact pressure elastically deforms the other of the mating elements into the grooves (50), and is less than the material yield strength of either of the mating elements. In the preferred embodiment, the grooves (50) are radially oriented and an applied compressive load produces a nominal contact pressure which is about 80% of the material yield strength.

Abstract: A locking washer arrangement which includes two (2) washer members fabricated from a hardened steel material, a thicker one on the bottom and a thinner one on the top. The top surface of the top washer member and the bottom surface of the bottom washer member preferably have a relatively high coefficient of friction and may be grooved, embossed or otherwise roughened so they will grip the surfaces they come into contact with while the bottom surface of the top washer member and the top surface of the bottom washer member have a relatively low coefficient of friction to facilitate relative movement therebetween. Relatively long flexible tabs project radially outward from the periphery of the top washer member and distal ends are bent downwardly to engage and interlock between corresponding relatively short stiff tabs projecting radially outward from the periphery of the bottom washer member.

Abstract: An obturating device including a body (11) with a recess (8) at one end engageable by a spanner, and a screw thread (2) at the other end for engaging a complementary screw thread (7) in an opening (6) of a housing (3). A locking ring (31) biased by a spring in the obturating device (1) and a complementary locking ring (47) in the opening have asymmetrical teeth which interlock when screwing-in is complete and snap together to prevent loosening of the rings. The tooth flanks that engage one another on loosening are nevertheless sufficiently angled to enable forced unscrewing using a spanner. A skirt (14) protects the mechanism and acts as an abutment in the fully screwed-in position. The obturating device enables locking and unlocking, requires no direct manual operation and is particularly suitable for endoscope insertion openings in aircraft engines.

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: 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-locking nut for application to a threaded shaft, especially a wheel bearing nut. The shaft has a spline groove along its thread. A cup-like thrust washer fits on the shaft with a tang in the spline grove to prevent its rotation. It has retention grooves in its wall. A lock ring is slidably retained in the washer with tangs in the retention grooves. A bias spring is fitted between the washer and the lock ring. An internally threaded nut is threaded to the shaft and has a depending neck passing through the lock ring having a bearing surface to bear against the washer, and an outward deformation which prevents removal of the nut from the lock ring.

Abstract: A stack of parts, such as the stator disks of a turbomolecular pump, the parts being stacked alternately with spacers, includes a spacer having a knife-shaped deformable portion. When the stack is installed for the first time, the portion is compressed so as to take up the tolerances of the stack between abutment surfaces, e.g. delimited by a pump body and a corresponding casing. The invention applies in particular to turbomolecular pumps and aims to eliminate the operations of adjustment, re-machining, or matching that are usually required when installing a stator assembly.

Abstract: An assembly of a bolt, a washer, a nut and locking structure for locking the bolt against rotation after the bolt, washer and nut have locked together a pair of flat, plate-like members in frictional engagement with each other. Any tendency for the bolt to rotate in a reverse direction will be prevented by the locking means. The plate members will essentially be bonded together against movement relative to each other, thereby maintaining structural integrity of the assembly. In a first embodiment, the head of the bolt has a notch for receiving one end of split ring washer. The other end of the washer is in a notch in the nut. The nut and washer define a locking unit for preventing reverse rotation of the bolt after the head of the bolt has been moved into proximity with the washer and the washer has been moved into the notch of the nut. Other embodiments are disclosed.

Abstract: A lock nut to be threaded onto a threaded shank which has a keyway. The lock nut has a base, a key on the base to fit in the keyway, a peripheral wall with axial angularity spaced apart recesses, and a wave spring. The wave spring has ridges and radial tabs to fit in the recesses. An internally threaded nut has radially-extending grooves complementary to the ridges to hold the nut against rotation relative to the wave spring when the ridges fit in the grooves. The tabs can be contacted by a drive member to compress the wave spring and remove the ridges from the grooves to enable the nut to turn during installation and removal.

Abstract: Means for preventing the common rotation of one of a bolt and a nut in the case where the other of said bolt and said nut is rotated by means of a tool, such as spanner, to screw up a plurality of members by the use of the bolt and the nut is provided.

Abstract: A bolt shank and washer have contiguous respective elliptical and circular surfaces that interact to impart an undulated axial distortion to the washer in a circumferentially running sinusoidal way, so that the washer acts in spring-like fashion to lock the bolt in its tightened position. The elliptical surface is tapered outwardly toward the bolt head to give an increased spring constant with increased tightening.

Abstract: An anti-rotation locking device for threaded fasteners which secure rotating parts subject to vibration, shock and the like. The device comprises a strap member and one or more retainer members. The strap member is positioned under the fasteners and the retainer members each have a toothed opening which is installed over the matching wrenching surface of the fastener. Each retainer member also has an arcuate slot which is positioned above an arcuate tang on the strap member. The tang is lifted, passed through the slot, bent about the bottom of the slot and folded back over the top surface of the retainer member to thereby restrain the loosening of the fastener.

Abstract: A loading washer assembly includes an annular first washer provided with spaced apart ears on its outer peripheral edge with each of the ears having a return bent portion at its free end, an annular second washer provided with spaced apart notches on its outer peripheral edge for slidably receiving the ears whereby to prevent relative rotation of said washers, the return bent portions of the ears limiting the axial extent of separation of these washers. Each of the washers on their opposed surfaces have circumferentially spaced apart, radial extending raised ribs with the ribs on the first washer rotatively offset from the ribs on the second washer. A normally flat spring ring is interposed between the first washer and the second washer in position so as to be engaged by the opposed sets of ribs whereby the spring ring will be deformed into a wave-like spring upon axial displacement of the first washer toward the second washer.

Abstract: A roller skate having a wheel support assembly which provides a single device for adjusting the compression within the assembly. The adjustment is accomplished by a cap at the lower end of the assembly which can be rotated to apply the required compression, without the need to loosen any other part of the mechanism. The cap is locked in place after rotation, and is indexed to permit the repeated positioning of the cap.