A fastener for a corrugated sheet includes a cylindrical assembly including elongated, plate shaped fastening members assembled as a hollow cylinder, the fastening member tapered to one end to form a hook at one end and having a curved groove on an outer surface, and a curved trough on the outer surface at the other end of the fastening member, the curved troughs assembled to form an annular recess; a retainer ring secured to the annular recess; a ring-shaped elastic member secured to the curved groove; a first sealing member put on the retainer ring; and a washer; a threaded bolt driven through the washer, the retainer ring, and the fastening member; and an expansion nut having a multi-sided outer surface and moveably secured to the threaded bolt.

A fastener for a corrugated sheet includes at least one support on a top of the corrugated sheet; at least one steel member on a bottom of the corrugated sheet; a cylindrical assembly including elongated, plate shaped fastening members assembled as a hollow cylinder, each fastening member tapered to one end to form a hook and having a curved groove on an outer surface, and a curved trough on the outer surface at the other end, the curved troughs assembled to form an annular recess; a retainer ring secured to the annular recess; and a ring-shaped elastic member secured to the curved groove; a threaded bolt driven through the retainer ring, the fastening members, the support, and the corrugated sheet into the steel member; an expansion nut moveably secured to the threaded bolt; and a ring-shaped first sealing member fastened between the support and the corrugated sheet.

According to one embodiment a sealing plug is provided that includes an elastic body and a stem assembled coaxially with respect to one another. The elastic body is suitable for being expanded radially by pulling on the free end of the stem, which projects out of the elastic body, once it is inserted into the hole to be plugged, the elastic body applying a closing pressure against the hole. The sealing plug also comprises an empty space, arranged between the elastic body and the stem, which is communicated with the outside, such that the entrance of fluid into the elastic body is allowed so that the fluid applies pressure against the elastic body, thereby increasing the closing pressure applied by the elastic body against the hole.

A device and method for an expandable anchor sleeve. An expandable anchor sleeve may comprise a front-end and a back-end for a wellbore comprising a base casing. The expandable anchor sleeve may further comprise an anchoring element having a conical shape with a front-end radial thickness being larger than a back-end radial thickness, not less than a difference between corresponding radii of maximum and minimum internal diameters of the base casing and providing the anchoring element is in interference contact with the base casing upon radial expansion of the expandable anchor sleeve by an expansion swage propagating in the front-end direction. A method for installation of an expandable anchor sleeve in a well comprising a base casing which may comprise connecting an expandable anchor sleeve to an expansion, deploying the expandable anchor sleeve, activating the expansion device, and removing the expansion device from the well.

An improved fastener with an annular sealing flange disposed above a lead-in base clip portion adapted for insertion into an acceptance opening in a panel or other structure. A heat-shrunk seal is disposed about the perimeter of the annular sealing flange in partial covering relation to upper and lower surfaces of the annular sealing flange to provide an enhanced sealing relation between the sealing flange and the panel.

A sealing plug has an elastic sleeve of thimble-like basic shape. A wound-up band of the sealing plug is inserted in the sleeve. The number of windings or turns of the band can be reduced by rotating the inner end of the band, wherein the outside diameter of the band, and hence the outside diameter of the elastic sleeve, widens. The band can be inserted in pretensioned state into the sleeve and can slacken after insertion into an anchor hole. The band can be expanded in the anchor hole beyond the slackened state of the band. The sealing plug further has a latching mechanism, which prevents back-rotation of the expanded sleeve. The sealing plug enables a radial expansion, and hence a sealing of anchor holes of different diameter, without shortening of the axial sealing surface of the sleeve.

Disclosed herein is an attachment system, for providing a component mounting location, that comprises a laminated structure and a bracket. The bracket comprises an interface surface configured to interface with a first side of the structure, and a through hole open at the interface surface. A shear stud of the attachment system comprises a projection, shaped to pass through the hole of the structure and engage the through hole of the bracket, and a seal region, positioned to interface with a second side of the structure to form a seal with the second side of the structure. The attachment system additionally comprises a fastener comprising a head and a shaft, the shaft being shaped to pass through the through hole in the bracket and engage the shear stud to secure the shear stud relative to the bracket thereby reducing shear at the fastener.

Disclosed herein is an attachment system, for providing a component mounting location, that comprises a laminated structure and a bracket. The bracket comprises an interface surface configured to interface with a first side of the structure, and a through hole open at the interface surface. A shear stud of the attachment system comprises a projection, shaped to pass through the hole of the structure and engage the through hole of the bracket, and a seal region, positioned to interface with a second side of the structure to form a seal with the second side of the structure. The attachment system additionally comprises a fastener comprising a head and a shaft, the shaft being shaped to pass through the through hole in the bracket and engage the shear stud to secure the shear stud relative to the bracket thereby reducing shear at the fastener.

Provided herein are sealing compound-filled plastic caps for sealing of connecting elements in aircraft construction against liquids, wherein these plastic caps function as combined protection against fuel and hydraulic oil, especially that based on tributyl phosphate, and against lightning strikes, and can be produced and applied in an economically viable manner. The plastic cap for sealing of connecting elements in aircraft construction consists predominantly of at least one high-performance polymer having a breakdown resistance of at least 10 kV/mm to DIN IEC 60243, and has been filled with a sealing compound having a high energy absorption capacity and including at least one filler selected from the group consisting of gas- and/or air-filled hollow packings, where the plastic cap and the sealing compound are cohesively bonded to one another. Additionally provided is a method of filling and application of such plastic caps, and a corresponding aircraft.

A device and method for an expandable anchor sleeve. An expandable anchor sleeve may comprise a front-end and a back-end for a wellbore comprising a base casing. The expandable anchor sleeve may further comprise an anchoring element having a conical shape with a front-end radial thickness being larger than a back-end radial thickness, not less than a difference between corresponding radii of maximum and minimum internal diameters of the base casing and providing the anchoring element is in interference contact with the base casing upon radial expansion of the expandable anchor sleeve by an expansion swage propagating in the front-end direction. A method for installation of an expandable anchor sleeve in a well comprising a base casing which may comprise connecting an expandable anchor sleeve to an expansion, deploying the expandable anchor sleeve, activating the expansion device, and removing the expansion device from the well.