A coupling mechanism is provided for coupling a supporting element to a frame, and includes a base member and a C-shaped retainer. The frame includes a frame body and a leg member that has a leg body extending downwardly from the frame body to terminate at an enlarged leg end. The base member defines therein a recess for the enlarged leg end therein. The supporting element is coupled to a lower major surface of the base wall. The C-shaped retainer extends to be disposed about the leg body, and is configured to be detachably coupled to a surrounding wall of the base member for retaining the enlarged leg end in the recess.

A cavity-type radio frequency filter is disclosed. the radio frequency filter having a cavity structure including an enclosure, a resonant element, a cover, a frequency tuning screw, and a resilient fixing member. The enclosure has a hollow inside and an open surface on one side to have a cavity. The resonant element is positioned in the hollow of the enclosure. The cover has a screw hole having a preset diameter at a position corresponding to the resonant element, and is configured to seal the open surface of the enclosure. The frequency tuning screw is configured to be screwed into the screw hole of the cover, and it has an upper end formed at least partially with a latching abutment that protrudes outwardly.

The two lockable stainless and lossless screw pairs at two ends of the bolt are provided both to avoid screw pairs stained or destroyed by strain force from loading and to decrease the cost because of energy consumption in traditional process of bolt or its cost from environmental pollution.

A fastener structure and a method of manufacturing the same are introduced. The fastener structure includes a body portion and an engaging portion. The body portion is formed from a plate element shaped by being folded, shaped by being rolled or shaped by being pulled. The body portion has a receiving space. The engaging portion is movably fitted to the body portion. The engaging portion has a head portion and an engaging-connecting portion. The engaging-connecting portion is disposed in the receiving space. The body portion is movably fitted to the engaging portion and fitted to an object, whereas the engaging portion is engaged with another object or removed from another object, to not only fit together and separate at least two objects repeatedly and quickly but also render the fastener structure easy to manufacture.

An intelligent fastener unit for fastening together structural members. The fastener unit includes a fastener with an externally threaded shank, an internally threaded mating member for threaded engagement with the fastener, and an intelligent washer having an RFID tag and an antenna mounted on one surface of a centrally aperture body member, and a pressure sensor mounted on the opposite surface for generating electrical signals representative of the compressive force applied to structural members captured by the fastener, the mating member and the washer. An air gap is formed in the washer body member between the outer periphery and the central aperture to reduce eddy current formation when the RFID tag is interrogated by an RFID tag reader using r.f. signaling. The RFID tag has a memory containing information specific to the fastener unitsuch as fastener unit identification, specified torque value and other information Once installed, the existing torque on a collection of fastener units is measured by using the RFID tag reader to scan the information stored in the memory of each fastener unit washer.

A rivet nut fastener has a cylindrical nut having a length that extends from a proximal end having an outwardly extending flange, through a central portion, to a distal end; a bore that extends into the nut accessible through an opening at the proximal end to an internally threaded portion of the bore adjacent the distal end of the nut; and a spiral structure mounted on an exterior portion the distal end of the nut. The nut is shaped to be inserted through the aperture, along with the spiral structure, such that the central portion may be compressed so that the length of the nut is reduced, thereby compressing the spiral structure to form a support structure, such that the support structure and the flange together clamp the wall therebetween so that the rivet nut fastener is securely mounted on the wall.

An attachment mechanism for a gas turbine engine component includes an elongated body having at least first and second ends. A first attachment feature is formed at the first end. A second attachment feature is formed at the second end. The first and second attachment features define attachment points configured to attach a first gas turbine engine component to a second gas turbine engine component. A fan section for a gas turbine engine and a gas turbine engine are also disclosed.

A fastener assembly is provided. The fastener assembly includes an insert having a radial circumference. An annulus extends from the insert and defines an annular end distal from the insert. The annulus further defines a radial cutout section along a length thereof for providing a flex point. The annulus is configured for being radially compressed by a blind hole of a working surface upon tightening of a nut. A nut is positioned adjacent the insert on an end distal the annulus, and a threaded bolt extends from the nut and through the annulus, wherein the bolt is configured to be accepted by the blind hole.

An anti-loosening bolt and nut assembly structure includes a bolt having a bolt head and a bolt shank, two elastic washers, and a nut. The two elastic washers are sleeved on the bolt shank. The two elastic washers are matched with the bolt head and the nut, respectively. Each elastic washer includes an annular body having an opening. A bottom of the annular body is provided with anti-slip teeth. A top of the annular body extends upward to form an anti-loosening ring. An outer inclined surface is formed on an outer side of the anti-loosening ring. The anti-loosening ring is provided with a plurality of first unidirectional teeth. The bolt head and the nut each includes a unidirectional anti-loosening device matched with the first unidirectional teeth.

In a bolt holding device with a bolt draw-in arrangement engaging the bolt for joining for example furniture parts, a bolt retaining arrangement is provided which blocks the bolt draw-in arrangement when the bolt is not positioned in the bolt holding device and a release element is associated with the retaining arrangement which can be activated by the insertion of the bolt for drawing the bolt fully into, and locking it in, the bolt holding device. With the bolt holding device, furniture pieces for example can easily be assembled by an end user without the need for particular tools.