156results about "Load modified fasteners" patented technology

There is provided a sensor unit for a fastener assembly, the sensor unit comprising a mounting arranged to rigidly attach the sensor unit to, or adjacent to, a fastener assembly; and a sensor, that is an optical flow sensor or an inductive sensor, configured to sense movement of the fastener assembly. The sensor unit may comprise a processor arranged to process the output of the sensor to detect loosening of the fastener assembly and to output a signal representing the status of the fastener assembly. The sensor unit may comprise a wireless communication unit arranged to communicate the signal.

A torque control fastener system having a fastener nut, a helical wire insert, and a shaft, where the nut and helical wire insert have unique hardness and coefficient of thermal expansion relationships that produce improved performance.

The utility model discloses a large-span torsional shear type bolt assembly which comprises a torsional shear bolt, one end of the torsional shear bolt is movably connected with a wabbler, the side wall of the torsional shear bolt is movably connected with a gasket, one side of the gasket is fixedly connected with a preservative storage bag, and the torsional shear bolt is in threaded connection with a torsional shear nut. And one side of the torsional shear nut is fixedly connected with a crushing rod, and one side of the torsional shear nut is movably connected with one side of a preservative storage bag. The utility model relates to the technical field of torsional shear type bolts. Through cooperation of a torsional shear bolt, a gasket, a magnet ring, a sealing steel ring, a preservative storage bag, a torsional shear nut and a crushing rod, the space between the gasket and the torsional shear nut can be automatically coated with a rust remover when equipment is installed and fixed through the torsional shear bolt, workers do not need to manually coat the equipment with the rust remover, and the labor intensity of the workers is reduced; and meanwhile, the rust remover can be limited, the rust remover is prevented from splashing all around, and rainwater can be prevented from being directly poured on the side wall of the twist arrow nut.

Adjustment device (1) for adjusting a light module in a lighting device, comprising an adjustment means (10) into which a rotary movement can be introduced, and a transmission element (11) by means of which the rotary movement can be transmitted, and wherein the adjustment means (10) and the transmission element (11) are connected by means of a coupling (12) for torque overload protection, wherein the adjustment means (10) is formed in at least two parts and has a first part (10a) into which the rotary movement can be introduced and a second part (10b) which is formed as part of the coupling (12), wherein the coupling (12) has a metallic spring element (13) which is formed by means of the second part (10b) of the adjustment means (10) and which comprises several spring arms (14) which at least partially enclose on the outside a detent section (16) of the transmission element (11) formed with detent cams (15),characterized in that the spring arms (14) have detent projections (21) pointing towards the detent cams (15), which are in contact with the detent cams (15).

To provide a doubling plate for frictional joining capable of enabling fastening from one direction by a torque shear wrench and dispensing with a nut.SOLUTION: A doubling plate 11 is used in frictional joining with a bolt while being superposed on a member to be joined 10, by using a bolt which has a shape with a torque shear stud-type fracture groove and a pin tail, and on which a male screw 21 of left-hand thread is formed on one of half parts of the bolt, a male screw 23 of right-hand thread is formed on the pin tail-side half part, and a nut 22 is engaged with the male screw 23 of right-hand thread, as a stud bolt. The doubling plate is disposed below the member to be joined 10, enables fastening from one side by being provided with a female screw 11A of left-hand thread to be engaged with the male screw 21 of left-hand thread of the bolt, and provides a function as a nut of large width across flat.SELECTED DRAWING: Figure 1

A service tube assembly (30) comprises a service tube (32) having a threaded end portion (32b) and a ratchet hub (H) spaced from the threaded end portion (32b). The threaded end portion (32b) of the service tube (32) is threadably engaged with a mating part (34). The assembly further comprises a locking member (36) having a cantilever (36c) extending from a fixed end (36c') held relative to the mating part (34) to a free end (36c"). A ratchet pawl (P) is provided at the free end (36c") for engagement with the ratchet hub (H) on the service tube (32).

Kit (10) for providing a one-way torque nut (10') for a bolted connection, wherein the torque nut (10') is formed by - a screw part (12) having a threaded section (14), and - a drive part (16, 16') that can be coupled to the screw part (12) to transmit torque, wherein the drive part (16, 16') has an attachment area (22) for a torque-applying tool, wherein the screw part (12) and the drive part (16, 16') each have a configuration (K1, K2, K2') of positive locking elements (26, 28, 28') which are configured to form a positive locking element pairing in the coupled state of screw part (12) and drive part (16, 16') and to transmit the torque applied to the nut (10'), and wherein the kit comprises several screw parts (12) with relatively different configurations (K1) of positive locking elements (26), and / or several drive parts (16, 16') with relatively different configurations (K2, K2') of positive locking elements (28, 28'), wherein the positive locking element pairings that can be formed from the configurations (K1, K2, K2') differ in how much torque can be transmitted until the positive locking element pairing fails.

The cylindrical shaft (110) of a bolt (101) is provided with a central bore (113), extending axially from the head (130) of the bolt (101 ) over at least a part of the axial length of the bolt (101). The bolt is provided with a measuring pin (120) located inside the bore (113) and extending substantially parallel to the shaft (110). The measuring pin (120) has an anchor end (122) fixated with respect to the shaft and has an opposite free indicator end (121 ). The bolt is further provided with a sensor element (140, 141 ) comprising a magnet (141 ) attached to the free indicator end (121 ) of the measuring pin (120) and a magnetic sensor (140) fixated with respect to the shaft (110) and aligned with the first sensor component (141 ).

A turboshaft engine transmission with a torque measurement system is provided. The turboshaft engine transmission includes a front housing, a rear housing, a mating flange axially interposed between the front and rear housings, the mating flange defining a sensing bolt hole, assembly bolts disposed to assemble the front and rear housings to the mating flange with a preload sufficient to maintain assembly during engine operational conditions and a sensing bolt installed in the sensing bolt hole to measure forces exerted on the mating flange by the front and rear housings.

Provided is a nut which extends the fatigue life of a bolt in bolt-nut fastening and which is easy to produce. A nut (1) includes a nut body (2) with a flange part (5) and a shallow depression (7) with a depth of less than 1.5 pitches on the axial side of a bearing surface (5s), which is a flat surface extending perpendicular to an axis on the fastening side of the nut body (2). This nut (1) preferably has an additional rigidity part (6) on the release side.

A plurality of raised surfaces on the platform absorb the torque of fasteners that contact the surface while rotating relative to the platform. A significant disproportionate increase in torque compared to the associated increase in bolt stress is observed by the increase in torque felt when tightening the fastener. Raised surfaces are used on the knobs of mechanical pipe couplings to increase the fastener's resistance to damage when a power tool is used to apply torque to the fastener.

Tension control system for a fastener in an assembly and associated control method. The present invention relates to a tension control system (10) for a fastener (12) in an assembly (36), said fastener (12) comprising a rod (14) and an assembly member (16), the control system (10) comprising: - a first measuring device (44), the first measuring device (44) being adapted to measure a first parameter representative of the time response of the rod (14) to an ultrasonic excitation, - a second measuring device (46) adapted to measure a second parameter representative of the frequency response of the rod (14) to an ultrasonic excitation, and - a calculator (48), the calculator (48) being adapted to determine a value of the tension of the rod (14) as a function of at least said first parameter and said second parameter. Figure for the abstract: Figure 1

A torque limiting apparatus for a rotational mechanical fastener includes a driver head configured with a spring recess, a planar wave-spring positioned within the spring recess, a torque drive section with female ramps and a floating incline plane element configured with male ramps that match the female ramps. The planar wave-spring has ridges extending upward in a longitudinal direction which are positioned in contact with the floating incline plane element. As the torque limiting apparatus is tightened the planar wave-spring becomes compressed, and the male ramps begin to slip upward on the female ramps. Upon reaching a torque limit threshold force the male and female ramps become unmated, allowing the rotational mechanical fastener to rotate freely.

A screw assembly with built-in torque limiting functionality has a shaft having a threaded lower section and a cap mounted on the shaft. The shaft includes a plurality of fingers that extend into the cap and that are pushed outward against the interior surface of the cap by a wedge pin to frictionally engage against the cap. When a tightening torque is applied to the cap, the torque is transmitted to the shaft until the static frictional force of the finger / cap interface is overcome, then the cap moves relative to the shaft, thereby limiting the tightening torque experienced by the threaded lower section. Optionally, a one-way rotation control mechanism is included that allows the screw assembly to be loosened with confidence.

The invention relates to a screw-locking washer for arrangement between a screw head of a screw and a flat support surface having an elongated hole through which the screw is guided, the screw-locking washer comprising a washer top side (2) and a washer bottom side (3) facing the support surface, wherein the washer body (1) is convex, characterised in that the washer top side (2) of the washer body (1) is provided at its outer periphery with a circumferential rib (5).

A preload bolt assembly for connecting at least two engine components of a large turbocharged two-stroke uniflow crosshead internal combustion engine is disclosed. [Solution] A preload bolt assembly for connecting at least two engine components (22, 23) of a large turbocharged two-stroke uniflow crosshead internal combustion engine comprises a tie rod (40) and a nut (42), the two engine components being connected by the tie rod and nut, with one end of the tie rod passing through a mounting hole (41) of the engine component and the nut screwed into the threads of the end. This preload bolt assembly is characterized by comprising a braking means disposed on the outer circumference of the tie rod to prevent the tie rod from moving through the mounting hole in the event of failure of the tie rod.

A method and system for scheduling inspection of a bolted connection on a wind turbine, the bolted connection comprising a bolt under tension. At a first sample time, a first tension parameter of the bolt is determined, having an associated upper uncertainty bound, and, at a second sample time, a second tension parameter of the bolt is determined, having an associated lower uncertainty bound. Thereafter, a linear relationship is determined based on the upper uncertainty bound of the first tension parameter and the lower uncertainty bound of the second tension parameter. Based on that linear relationship, a third sample time is determined in the future, at which a further tension parameter is determined. Based on the third sample time, an inspection event is scheduled. A benefit of the invention is that inspection events are scheduled in an adaptive manner in a way that is responsive to the difference in values of those measurements, but which takes account of the inherent uncertainty in such measurements without compromising safety. In this way, inspection events can be scheduled less frequently that is currently the case which presents a much- reduced maintenance cost which still ensuring the integrity of the bolted connection.

A fastening device for keeping at least first and second parts assembled, the fastening device comprising a tubular body passing through the first and second parts, an expansion nut and a screw that is seated in the tubular body and cooperates with the expansion nut. To facilitate the removal of the fastening device, the screw has at least one shape, such as a recess positioned on the transverse face thereof, to prevent it from rotating using a first tool, and the expansion nut has at least one shape, such as a flat, to unscrew it using a second tool. Also an assembly comprising at least one such assembly device as well as a removal method.

Aspects of the present invention relate to a bolt anchor (110) arranged for use in a first structure (104) and to secure a bolt (134) which engages a second structure (106), to thereby secure the first structure (104) and the second structure (106) to each other. The bolt anchor (110) comprises an axially extending internal bore (116) defined by a side wall (138), a first end (132) and a second end (136) and is arranged to receive a bolt threaded portion (146) of the bolt (134). The second end (136) is enclosed. The internal bore (116) comprises an engagement portion (140) and an axially elongated overrun portion (142). The overrun portion (142) is substantially coaxial with the engagement portion (140) and is positioned further than the engagement portion (140) from the first end (132) of the internal bore (116). The first end (132) is that into which the bolt threaded portion (146) is received. The side wall (138) of the internal bore (116) has an engagement portion thread (144) in the engagement portion (140). The side wall (138) of the internal bore (116) in the overrun portion (142) is of a cross-sectional diameter greater than a major thread diameter of the engagement portion thread (144).

This application discloses a torque bolt, relating to the field of connecting fittings technology, comprising a threaded sleeve, a screw, and an elastic element. The first end face of the threaded sleeve has at least two ratchet grooves, and the circumferential outer wall of the second end of the threaded sleeve has external threads. The first end of the screw has ratchet teeth that mesh with the ratchet grooves. The elastic element applies force to the screw to engage the ratchet teeth with the ratchet grooves, thereby allowing the threaded sleeve and screw to rotate synchronously. In use, the rotation of the screw drives the threaded sleeve to rotate together and be screwed into the threaded hole of the threaded sleeve or nut. During tightening, when the torque provided by the external thread friction exceeds the torque limit of the torque bolt, the elastic element deforms, the ratchet teeth extend from the ratchet grooves, and the screw slips relative to the threaded sleeve, while the threaded sleeve stops rotating, thus achieving torque limitation. This solves the problem of substrate cracking or threaded sleeve dislodgement caused by excessive pre-tightening force when pre-embedded threaded sleeves are embedded in plastic or fiberglass substrates.

A bolting system with a loosening detection function includes: a bolt body in the form of a stud bolt which is inserted into a workpiece; nuts screw-screwed to both ends of the bolt body to fasten the workpiece; and a sensor module positioned between the nut and the workpiece to detect bolting information including fastening pressure and fastening position of the nuts, wherein the sensor module has a small battery embedded for power supply and is configured to perform pairing (wireless communication) with a control unit including a terminal and a server by a communication module.

Instrumented nut, clamping sleeve, clamping device and method for tightening such a nut. The invention relates to an instrumented metal nut (10b) comprising a tubular body having a polygonal drive surface (14). The nut comprises, on at least one annular portion (34) of the outer surface: an electrically insulating layer (36) applied to the annular portion; a piezoresistive conductive polymer (38) whose ohmic resistance varies according to a stress exerted during tightening of the nut on a threaded fastener, said conductive polymer being applied to the electrically insulating layer; and at least two electrodes (40). Figure for the abstract: Figure 2

The invention relates to a hydropneumatic accumulator (1), comprising: - an enclosure (2) formed by a first half-shell (3) and a second half-shell (4) that are screwed to one another by means of a first thread (6) and a second thread (8) arranged on the first half-shell and on the second half-shell, respectively; and - a membrane that is pinched between the first half-shell (3) and the second half-shell (4); the first thread (6) and the second thread (8) have the following characteristics: - a pitch P; - an angle α formed by the engagement flank (22), which is between 15° and 35°; - an angle β formed by the load-bearing flank (23), which is between 5° and 10°; - a radius of curvature R of the root (25), which is between 0.15 P and 0.25 P; - a width L, which is between 0.20 P and 0.40 P; and - a distance D1, which is greater than or equal to the sum of the height H and of the radius of curvature R.

A battery pack and a vehicle including the same are disclosed. The battery pack according to an embodiment of the present invention comprises: a plurality of battery modules each having a plurality of stacked battery cells; a pack case in which the plurality of battery modules are accommodated; and a fastening member that fastens the pack case, in which at least a portion of the fastening member is coupled to the pack case, and the fastening member is configured to break when a pressure inside the pack case increases.

A breakaway threaded fastener is provided that includes a hollow stud, a pin, and a cap. The stud has a hollow cavity, a closed end, an open end with an upper surface, a wall, and an outer surface, which includes an external thread. The pin is in the hollow cavity with a first end at the closed end of the hollow stud and a second end proximate the open end of the hollow stud. The cap has another hollow cavity with a closed end, an open end, an inner surface, and an internal thread. The cap is threadably engaged to the open end of the hollow stud via the internal and external threads so that the second end of the pin abuts the inner surface of the cap with a gap remaining between the upper surface of the hollow stud and the inner surface of the cap.

An instrumented, load-sensing washer that can be used on a bolted joint to facilitate determining an axial clamping load of the bolted joint. The washer includes an annular washer body having first and second oppositely disposed axial ends and an outer circumferential sidewall. At least one strain gauge is provided on the circumferential sidewall and is configured to sense a deformation of the washer body do to clamping forces of the bolted joint. The washer further includes a communication assembly operatively coupled with the at least one strain gauge. The communication assembly may include an integrated circuit adapted to receive electrical signals from the at least one strain gauge related to the axial load borne by the washer.