A three-piece locking fastener including an interiorly threaded intermediate component open at opposite ends. A first screw having a first exterior thread pattern rotationally inter-engages with the interior threads of the intermediate component when installed through a first selected one of the opposite ends, the first screw having a hollow shaft exhibiting a further plurality of interior threads matching a direction of the first thread pattern. A second screw has a second exterior thread pattern opposite the first pattern and, upon being installed within the other selected one of the opposite ends, rotationally inter-engages the interior threads of the first screw, so that loosening of either of the first and second screws being prevented by their counter-threaded orientation.

A motor adapter assembly can couple a motor shaft for a ceiling fan motor to a downrod. The motor adapter assembly can include a base plate, a cradle with arms extending through the base plate, and a threaded bushing secured between the arms of the cradle. Threading a cap to the threaded bushing can be used to pivot the downrod between an upright position and a pivoted position.

A fixing device has two threaded rings (10, 12), and aa membrane (14) held between them that is an integral part of this pair of rings (10, 12) and is kept at a distance from the rings (10, 12) by introduced slots (16, 18, 24, 26), rectilinear in a unmounted state. The slots open to the outside. By resting against only partially annularly extending webs (20, 22) and having a clamping bolt (30) usable to adjust the axial distance between the and passing through the membrane (14) between two adjacent webs (20, 22), in the unmounted state the membrane is oriented in an undeformed manner in parallel to the rings (10, 12) and in a mounted state it is moved between the webs (20, 22) in a deformed state in the direction of at least one of the rings to at least partially form a slanted or arc course, as soon as the distance (a) between a pair (10, 12) of rings (10, 12) is reduced by the clamping bolt. The clamping bolt (30) passes through adjacent slots (16, 18, 24, 26) separated from the membrane (14).

A locknut for a threaded bolt which uses a pair of cooperating movable members that apply a three hundred and sixty degree engaging force on the threaded bolt locking the locknut to the threaded bolt. The pair of cooperating members are mounted within the body of the locknut. The locknut is the same physical size as a conventional nut that doesn't include any locking mechanism. The locknut can be loosened and reused multiple times.

A fastening structure inserts a threaded rod 11a of a bolt 11 through a fixing hole 12a of a to-be-fixed member 12 in a manner such that an end portion of the threaded rod protrudes from the fixing hole, and screwing a machine screw 15 with a proper torque into a nut 14 which is provided on the end portion via a washer 13. The washer has an inclined surface 13c formed on a first side 13b which faces the nut, and has a flat surface formed on a second side 13d. The machine screw is screwed into the nut in a direction such that an axis is orthogonal to the inclined surface 13c. The first side (the inclined surface) and the second side of the washer have a different surface roughness, and the first side has a smaller coefficient of friction than the second side.

A locknut which uses a pivotable segment mounted within the locknut body to slightly deflect producing an increased friction (locking force) between the locknut body and bolt which is threaded into the locknut body. This locking force is preset at the construction of the locknut to assume a lower amount of force or a higher amount of force according to the desires of the customer purchasing the locknut. The amount of force could be adjustable by using a set screw.

Aspects of the disclosure relate to a mechanical fuse having a first component having an opening in a lower wall and a ledge arranged around the opening and a second component having a top surface with a threaded opening arranged therein. The top surface of the second component may be oriented towards the first component such that the top surface is arranged entirely below the lower wall in order to enable the first component and the second component to pivot relative to one another at the bolt. The mechanical fuse may also include a bolt having a neck including a reduced cross-sectional area portion, and the bolt is configured to break and separate the first component from the second component when a predetermined amount of force is transmitted from the first component to the reduced cross-sectional area portion via the pivoting.

A captive fastener and method of use is disclosed wherein the screw is comprised of a head and shank, and where the shank includes a radial counter bore that retains a spring biased pin. The spring may bear against a plug in the counter bore or the shank inner wall, and biases the pin outward such that it extends outside of the shank in the absence of a compressive force. The captive screw is inserted through a top panel by tilting the screw at the opening of the panel such that the pin is pushed inward into the channel formed by the counter bore (against the force of the spring). Once the pin is recessed in the screw, the screw is passed through the panel opening until the shank emerges on the other side. Once the shank pushes through the panel, the pin will emerge under the biasing of the spring to extend outward of the shank in the radial direction. The pin thus prevents the screw from disengaging with the panel. A holdout fork is applied to the shank to anchor the screw at the retracted position, which keeps the screw up right against the surface of the panel.

A hand tool for bolts fastening includes a block-shaped jig body, a first bolt hole is disposed in the jig body laterally and a second bolt hole is disposed in the jig body longitudinally, an end of the second bolt hole is in communication with the first bolt hole, the second bolt hole allows a packing bolt to pass through and be screwed, a hemispherical suppression portion is disposed at an end of the packing bolt, the first bolt hole allows a to-be-fastened bolt to be screwed, the suppression portion of the packing bolt is pressed down on a selected position of the bolt, to cause a crest at the selected position to expand outward, so that interference occurs when the bolt is screwed with a bolt hole or a nut, to increase a torque force required to make the bolt come off.