Abstract: A pyrotechnic composition comprising a mixture of finely divided magnesium and silicon dioxide, both distributed throughout a binder selected from the members of the group consisting of polybutadienes and teflon. The composition is suitably insensitive, and yet readily ignitable, and does not require the use of solvents or of expensive spheroidal magnesium granules for its manufacture.

Abstract: A pyrotechnic composition produced by mixing and permitting to cure a mixture of aluminum, calcium sulfate, magnesium sulfate, and water. Increased heat output and density and improved ignitability result, while exotherm during curing can substantially be eliminated.

Abstract: A metal rivet, a two-piece rivet assembly, and a joint including the assembly. The metal rivet includes a preformed head at one end of a solid shank. At the other end there is a tubular upsettable portion which is circularly cylindrical with a recess which terminates at a base opening at said other end of the solid shank. The tubular upsettable portion is so proportioned as to form a proper upset head. At least a part of a core pin fits in the tubular upsettable portion and is retained therein after the rivet is set. During setting it prevent internal buckling of the tubular upsettable portion, and after setting it reinforces the upset head to prevent rollout as a consequence of axial separative forces. As an optional feature, at the terminal part of the forming of the upset head, the core pin can be pressed against the base to swell the solid shank and create a closer, or even an interference, fit for the shank in a workpiece.

Abstract: A metallic balanced pin for a shear flow joint, and a fastener and joint including the pin. The pin has a head, a cylindrical shank and a reduced neck. The neck includes a peripheral groove, a helical thread being an example. The inherent strengths of the head and groove are substantially equal and only sufficient to resist axial tensile forces exerted by bending in a shear flow joint. The inherent strength of the shank section is sufficient to resist shear forces in the joint. Preferably the intersection of the neck and a transition section connected to the shank section is locally work-hardened to resist fatigue forces.

Abstract: A self-retaining safety bolt assembly having a headed end, a cylindrical shank, and a pin tail nut with a tubular shank telescoping over the cylindrical shank with means near the headed end to retain the tubular shank on the cylindrical shank in a hole in a workpiece. An axial passage opening into the headed end intercepts a laterally-extending passage wherein a dog is laterally reciprocable so as to be extendable beyond a maximum diameter of the cylindrical shank or to be entirely retracted within it. A cam member having a pair of oppositely facing cam surfaces is axially slidable in the axial passage. The dog has a pair of followers, one on each side, bearing against the oppositely directed cam surfaces whereby the lateral position of the dog is uniquely a function of the axial position of the cam member.

Abstract: A safety bolt having a headed end, a shank, and a second end with means near the second end to hold the bolt in a hole in a workpiece. An axial passage opening into the second end intersects a laterally-extending passage spaced therefrom, and a dog fits in the laterally-extending passage wherein it is laterally reciprocable so as to be extendible beyond the maximum diameter of the shank or to be entirely retracted within it. A cam member having a pair of oppositely facing cam surfaces is axially slidable in the axial passage. The dog has a pair of followers one on each side bearing against oppositely directed cam surfaces whereby the lateral position of the cam is uniquely a function of the axial position of the cam member. Bias means is provided to bias the cam member to a position corresponding to maximum extension of the dog.

Abstract: A safety bolt having a headed end, a shank, and a second end with means near the second end to hold the bolt in a hole in a workpiece. An axial passage opening into the second end intersects a laterally-extending passage spaced therefrom, and a dog fits in the laterally-extending passage wherein it is laterally reciprocable so as to be extendible beyond the maximum diameter of the shank or to be entirely retracted within it. A cam member having a pair of oppositely facing cam surfaces is axially slidable in the axial passage. A bias spring is provided to bias the cam member to a position corresponding to maximum extension of the dog. A plug is detachably attachable to the safety bolt to hold the cam member in a position respective to retraction of the dog. A projection can be provided on a nut for use with this bolt to prevent reversal of the nut, and a plurality of bias springs each with a different rate can be used.

Abstract: A two-piece rivet assembly comprising a shank member and a collar. The shank member includes a head, a cylindrical shank, and a helical thread with a substantially constant pitch, but with a crest diameter which decreases as it extends away from a maximum adjacent to its end farthest from the shank. The ring-like collar has an inner wall, an outer wall, and a first and a second end. The inner wall defines a passage between the ends to receive at least a portion of the thread. With the shank placed in an aperture in a workpiece with at least a portion of the thread projecting beyond a surface of the workpiece, the collar is placed over the thread and a swaging setting force is applied. This force applies both axial and radial components to the collar. This forces the collar against a surface of the workpiece and swages the wall into the thread at its maximum diameter and then continuously along the thread, exerting a tensile force on the shank member.

Abstract: A blind fastener for fastening bodies together comprises a hollow tubular sleeve and a core bolt passing through the sleeve. The sleeve has a head at its front end to engage the front of the fastened bodies and the bolt has a head at its front end to engage the head of the sleeve. The sleeve has two sections, the first of which, adjacent to the sleeve head, has an internal diameter to fit over the core bolt, and the second of which, at the end of the sleeve remote from the sleeve head, has a larger internal diameter to leave an annular space between the core bolt and this second section.The end portion of the core bolt remote from the bolt head is threaded to engage the threads of a nut. The nut has a head rearward from the sleeve, from which there protrudes a tubular shank which extends into the annular space toward the sleeve head. The nut has an outside diameter larger than that of the nut shank but no greater than that of the sleeve.

Abstract: A depth gage for indicating the depth of a hole through a workpiece which is to be attached to a nut-plate by a threaded fastener, comprises a rod with a cylindrical portion adapted to pass through the hole and abut the nut-plate so that a forward section of the rod enters within the threads of the nut-plate. A sleeve slidable on the rod in front of the workpiece can be slid to abut the front surface of the workpiece. Graduated markings on the rod indicate the depth of the hole.

Abstract: A safety bolt having retention means to prevent its removal from a hole unless the retention means is released. The bolt includes a solid shank, and the retention means, which is outside the hole, has a slot with a pivoted latch means which is biased to move outside the diameter of the shank to prevent removal of the bolt. Access to the latch means enables it to be pivoted to a non-interfering position. The retention means can also form part of means to prevent a nut from being unthreaded from the bolt.

Abstract: A unitary lockable turnbuckle constructed from an elongated member, which is partially slit at two axially spaced-apart locations so as to form an interconnected barrel with a nut at each end. A thread is formed in each nut and the adjacent portion of the barrel, the thread at one end being of opposite hand from the thread at the other end. The slits leave reduced shear sections which break when the nuts are sufficiently torqued in opposition to the barrel. Preferably the width of the slit is reduced substantially to zero before the thread is formed.

Abstract: An inherently torque-limited nut including a nut body having an internal shank-receiving threaded opening to engage a mating thread on a shank. A drive ring is held to the nut body by engagement means and includes inherent limiting means which limit the torque which can be applied to the drive ring by failing at a predetermined torque.

Abstract: A knee joint coupling comprises a pair of similar U-shaped links each having a base and two parallel legs extending perpendicularly from the base. One of the legs of each link has a hole through it and the other leg has a pin extending from it in the direction either toward or away from the hole. When the pin of each link is fitted into the hole of the other link, there is assembled a knee-joint type of coupling due to the pivoting action of the pins in the holes. The links may be held assembled by means such as screw members inserted through the bases and into the region between the legs of the two links. Alternatively one of the links may have its base fixed to one member while the other link is fixed to the other member in which case the two members are pivotable as a door hinge or the like relative to each other.

Abstract: A fastener such as a rivet, bolt or screw is provided with a protective coating for protection against corrosion and deterioration, formed by application of a mixture of a powdered metallic substance such as powdered aluminum or molybdenum disulfide with a phenol-formaldehyde resin in a volatile carrier from the group consisting of lower alkyl alcohols, methyl ethyl ketone and petroleum distillate, such as toluene or ethyl alcohol, or both, together with strontium chromate and zinc chromate. Either teflon or fatty amido diamine is added to the foregoing mixture. The thickness of the coating after drying can be made very thin and controlled to a high degree and possesses sufficient toughness and lubricity so that it is not damaged even when used on interference type fasteners.

Abstract: A fastener such as a rivet, bolt or screw is provided with a protective coating for protection against corrosion and deterioration, formed by application of a mixture of a powdered metallic substance such as powdered aluminum or molybdenum disulfide with a phenol-formaldehyde resin in a volatile carrier from the group consisting of lower alkyl alcohols, methyl ethyl ketone and petroleum distillate, such as toluene or ethyl alcohol, or both, together with strontium chromate and zinc chromate. Either teflon or fatty amido diamine is added to the foregoing mixture. The thickness of the coating after drying can be made very thin and controlled to a high degree and possesses sufficient toughness and lubricity so that it is not damaged even when used on interference type fasteners.

Abstract: There are disclosed nut locking assemblies comprising a washer adapted to slide over a spindle and be keyed to it, and a lock-ring to the rear of the washer and secured to the washer against relative rotation. The nut abuts the washer. The lock-ring is slidable axially so that in a forward position it is disengaged from the nut but in a rearward position serrations on the lock-ring engage corresponding serrations on the nut to lock the nut against rotation. An annular space between the washer and the lock-ring contains a resilient ring which can be strained to alter its diameter. In its normal unstrained condition this ring holds the lock-ring in its locking position. When it is desired to move the lock-ring to its unlocked position it is pushed forward to disengage the serrations of the lock-ring from those of the nut.