An attachment structure for an equipment unit of an aircraft includes a first attachment device extending in a longitudinal direction of the aircraft, wherein the first attachment device is attached to a stringer and to a frame and wherein the first attachment device has a first engagement element and a second attachment device attachable to the equipment unit, wherein the second attachment device has a second engagement element adapted for engaging into the first engagement element, such that a force from the equipment unit in the longitudinal direction on the second attachment device is transferred via the second engagement element to the first engagement element and via the first attachment device to the stringer and the frame.

A mechanism allowing reliable, durable and easily releasable attachment of a member to a base mechanism is disclosed. The mechanism includes a quick attachment arrangement having a lock base and a rotatable lock ring within the lock base, the lock base and lock ring being arranged to receive a wedge plate for insertion into the lock base within the lock ring, and to securely attach an inserted wedge plate by rotation of the lock ring. In the inventive arrangement the lock ring is arranged to move, in a direction perpendicular to the plane of the lock ring, towards a wedge plate inserted into the lock base when rotated in a first direction for securing the wedge plate in the lock base, and to release the wedge plate when rotated in the second direction.

A lock catch comprises: a first lock catch portion, comprising: a first housing and a first connection portion arranged in the first housing; and a second lock catch portion, comprising: a second housing, a surface of the second housing includes a first and second insert hole; a rotary draw-bar assembly arranged in the second housing and comprising a draw-bar and rotation portion arranged on the draw-bar, the rotation portion and the first insert hole arranged oppositely, one end of the draw-bar includes a second connection portion matching the first connection portion, another end of the draw-bar includes a fixed connection portion, and the second connection portion connected to the first connection portion by the rotation portion driving the draw-bar to rotate, and a fixed shaft, arranged in the second housing and opposite the second insert hole, the fixed shaft locked with the fixed connection portion by rotating a specified angle.

This multi-couplings plate (P1) includes a locking device comprising a frame (14) fixed on the plate (P1), locking members and a drive mechanism, comprising a rotary element (18) rotatable in the frame (14), a sliding element translatable relative to the frame (14) and which cooperates with the locking members. The locking device also comprises several ratchet notches (301-309) secured to an element (18) of the drive mechanism (16) and juxtaposed in the movement direction relative to the frame (14) of the element (18) of the drive mechanism, the ratchet notches (301-309) comprising a final notch (309) and at least one intermediate notch (303-308), and a pawl movable in a housing (326) of the frame (14) and pushed back by a spring (28) toward one of the ratchet notches (301-309). When the pawl cooperates with the intermediate notch (303-308), the pawl limits the movement of the sliding element toward its forward position to a position midway between the forward position and the withdrawn position, and in the coupled configuration, the pawl cooperates with the final notch (309) and keeps the sliding element in the withdrawn position.

This multi-couplings plate (P1) includes a locking device comprising a frame (14) fixed on the plate (P1), locking members and a drive mechanism, comprising a rotary element (18) rotatable in the frame (14), a sliding element translatable relative to the frame (14) and which cooperates with the locking members. The locking device also comprises several ratchet notches (301-309) secured to an element (18) of the drive mechanism (16) and juxtaposed in the movement direction relative to the frame (14) of the element (18) of the drive mechanism, the ratchet notches (301-309) comprising a final notch (309) and at least one intermediate notch (303-308), and a pawl movable in a housing (326) of the frame (14) and pushed back by a spring (28) toward one of the ratchet notches (301-309). When the pawl cooperates with the intermediate notch (303-308), the pawl limits the movement of the sliding element toward its forward position to a position midway between the forward position and the withdrawn position, and in the coupled configuration, the pawl cooperates with the final notch (309) and keeps the sliding element in the withdrawn position.

An elastic connecting element, a processing method thereof and a flexible drill including the elastic connecting element are provided. The elastic connecting element includes an elastic part and an outer housing sleeved over the elastic part, the outer housing being formed by connecting a plurality of connecting bodies; the connecting body including a main body and convex teeth provided at two ends of the main body; a groove being formed between each two adjacent convex teeth in each connecting body, such that the two adjacent connecting bodies are connected by fitting the convex teeth of one connecting body with the grooves of the other connecting body.

An elastic connecting element, a processing method thereof and a flexible drill including the elastic connecting element are provided. The elastic connecting element includes an elastic part and an outer housing sleeved over the elastic part, the outer housing being formed by connecting a plurality of connecting bodies; the connecting body including a main body and convex teeth provided at two ends of the main body; a groove being formed between each two adjacent convex teeth in each connecting body, such that the two adjacent connecting bodies are connected by fitting the convex teeth of one connecting body with the grooves of the other connecting body.

A self-sealing fastener for reducing leaks between the self-sealing fastener and a substrate. The self-sealing fastener includes a shank that extends longitudinally between a first end and a second end. The shank has an outer surface. The self-sealing fastener also includes a head that extends radially outwardly from the first end of the shank. The head has an underside surface that is adjacent to the first end of the shank and a topside surface opposite the underside surface. A mastic sealant is disposed on at least one of the outer surface of the shank and the underside surface of the head to provide a water-tight seal between the self-sealing fastener and the substrate after the self-sealing fastener is installed in the substrate.

A shaft lockout has a clamp body that is configured to open and close for locating around a shaft of an electric machine. The clamp body has a clamp bottom portion and a clamp top portion that are hingeably coupled together and form a shaft aperture configured to extend around the shaft of the electric machine. An eyebolt extends between the clamp top portion and clamp top portion and has a bolt extension with bolt threads configured to receive a nut to secure the clamp body in a closed configuration. The shaft is restrained from rotating by a shaft set screw configured to thread into a set screw aperture in the clamp body to press against said shaft and a machine wedge screw configured to thread into a machine wedge aperture, also in the clamp body, and wedge against said electric machine.

A shaft lockout has a clamp body that is configured to open and close for locating around a shaft of an electric machine. The clamp body has a clamp bottom portion and a clamp top portion that are hingeably coupled together and form a shaft aperture configured to extend around the shaft of the electric machine. An eyebolt extends between the clamp top portion and clamp top portion and has a bolt extension with bolt threads configured to receive a nut to secure the clamp body in a closed configuration. The shaft is restrained from rotating by a shaft set screw configured to thread into a set screw aperture in the clamp body to press against said shaft and a machine wedge screw configured to thread into a machine wedge aperture, also in the clamp body, and wedge against said electric machine.