Abstract: A tube connector comprising a first member and a second member, each member being made from a sheet metal stamping. Each member includes an annular portion, a tubular barrel, and plural legs. The tubular barrel extends from an inner periphery of the annular portion. The legs extend outwardly from the annular portion and are adapted to flex axially so as to facilitate insertion of such member into the tube through one end of the tube. The legs have sharp edges tending to dig aggressively into an inner wall of the tube so as to resist withdrawal and rotation of such member. The tubular barrel of the first member fits within and extends through the tubular barrel of the second member and is crimped at one end so as to secure the tubular barrel of the second member bears at one end agains the annular portion of the first member. The tubular barrel of the first member is internally threaded and consequently deformed so as to fit tightly within the tubular barrel of the second member.

Abstract: A screw-type fastening device including a male threaded element such as a bolt and a female threaded element such as a nut in which each element contains a continuous helical root and crest disposed therein wherein the root and crest include V-shaped crests and V-shaped roots at an angle of 45.degree., respectively, external and internal chevron-shaped slots at angles of 90.degree., respectively, and three pairs of parallel load flanks, respectively, for easily releasing the threaded elements without abrasion and protecting them from self-lossensing from each other.

Abstract: A retractable and reusable self-locking fastening device in the form of a commercially available rivet, pin, threaded bolt or stud and the like for insertion into a sized clearance hole in a workpiece includes a shank means having tenon and pilot means which comprises two successive steps of lesser diameter formed on at least one end of the shank means. Mounted on and fixedly connected to the pilot means is a lug means having a generally truncated conical shape with one closed end and the end remote therefrom being opened to define a space in which the tenon means is disposed, and a sized aperture in the closed end to enable the lug means to be fixedly connected to the pilot means. The tapered walls of the lug means have at least four outwardly extending movable sections separated by at least four longitudinal slots defining a truncated cone configuration.

Abstract: A stack of fasteners cooperatively define a lateral groove which cooperates with an elongate rib to orient the stack in a magazine of a driving machine.

Abstract: A self-locking fastener having a bearing surface comprising a plurality of sets of serrations arranged to penetrate a workpiece such that, while a resistance to the loosening of the fastener from the workpiece is created, the marring of the workpiece surface is minimized. Use of the fastener is particularly advantageous if the workpiece consists of soft materials such as cast-aluminum or non-heat treated carbon steels. Each set of serration, when viewed as a profile, includes a downwardly inclined surface, a relatively deeper serration and a relatively shallower intermediate serration. The intermediate serration controls the depth of the penetration into a workpiece.

Abstract: An expansion dowel assembly includes an axially elongated anchor bolt and a pair of serially arranged expansion elements or shells into which the anchor bolt is drawn. The anchor bolt has axially extending conically shaped expansion members spaced apart in the axial direction and each is arranged to be drawn into a different one of the expansion elements. The expansion member closer to the leading end of the anchor bolt has a larger cone angle than the other expansion member. The expansion elements are interconnected by a web so that the expansion elements are axially displaceable relative to one another. When the anchor bolt with its expansion members is drawn into the expansion elements, initially the trailing expansion element is widened or expanded. Subsequently, after a predetermined axial movement of the leading expansion element toward the trailing expansion element, the widening of the leading expansion element is commenced.

Abstract: A weld stud having a cylindrical section permitting engagement by a stud welding gun, joined by a shoulder on to a threaded shank covered up to the shoulder by a cap nut made of plastics, wherein the cylinder section changes through a chamfer into a shoulder and the cap nut is provided with a resilient lip, which stretches to cover the chamfer when the cap nut is brought into contact with the shoulder. The threaded shank may have a ridge close to the shoulder which engages in a corresponding annular recess inside the cap nut. The cap nut may have a coaxial, preferably conical, projection at its end opposite the lip.

Abstract: An improved fastener provides axially extending teeth on a narrow shoulder adjacent the fastener head. The teeth bite into sheet material, and are particularly useful in biting into the surface of a thin sheet which is fastened to a thicker sheet material. The teeth extend from a shoulder formed on a medial collar between the head and a threaded shank. The narrow shoulder has a larger diameter than the end of the threaded shank to which the shoulder is joined. The teeth can be formed by cold-flow of the material of the shoulder so that the teeth axially extend from the outer peripheral edge of the shoulder in order to bite into the thin sheet metal proximate the annular periphery of the aperture in which the threaded shank is engaged. Preferably, the teeth axially overlap the threading of the shank which extends entirely to its junction with the shoulder, and the teeth are fabricated after the shank thread in order to enable such overlap by the teeth.

Abstract: A slide latch for latching the leading edge of a door, formed of a plastic panel, to an adjacent jamb-like member, is formed of a narrow, thin, horizontally elongated, flat plate positioned upon the door surface for sliding movement towards and away from the jamb-like member. Integral, narrow, rigid flanges, forming sled-like runners, are formed along the horizontally elongated side edges of the slider for slidable engagement with the panel surface. The slider is held within an open-ended, horizontally elongated, flattened loop that is struck-out of the panel. Stops are formed near the opposite ends of the slider for engaging the ends of the loops and thereby limiting the sliding movement of the slider. One of the stops may be enlarged to form a manual grip for moving the slider.

Abstract: A connecting member comprises a rod-shaped body having a head and/or thread on the outer periphery for integrally connecting a plurality of members and a containing hole opened at one end thereof and extended longitudinally, a rod disposed in the hole so as to fix at its inner end to the inner end of the hole, a transmissive window fixed to the opening of the hole, and a fluid holding member holding a colored fluid and pressed by the open side end of the rod on the window. When a longitudinal strain developed in the body the rod release the holding member from under pressure so that colored fluid covers the open side end of the rod.

Abstract: Briefly, the seal of the present invention comprises a stud with resilient fingers that fit into a socket that contains shoulders so that when the stud is moved past the shoulders, the resilient fingers collapse and then spring out to engage the shoulders and prevent return movement. A pilot projection guides the resilient fingers into the socket and ensures their correct position relative to the shoulders both during insertion and attempted removal. The exteriors of the socket and the stud are to substantially fill apertures in the articles to be sealed. Once the socket and stud are positioned in the apertures, they cannot be removed without breaking the seal. The socket is made with a second opening normal to the opening of insertion of the stud so that the seal can be manufactured inexpensively and easily in a one step molding operation.

Abstract: Disclosed is a mechanism for closing and locking two doors of the cowling of an aircraft engine. This mechanism includes a bolt which is received in a chamber of a receptacle. The bolt is connected to one door and the receptacle is connected to the other door so that, upon closure of the two doors, the bolt slips into the chamber. A cam attached to a rotary member housed within the chamber enables a single mechanic to close the doors and lock them snugly. This cam engages a finger on the bolt upon rotation of the rotary member which draws the bolt into the chamber by pulling against the finger. The cam moves into an over center position which securely locks the bolt in place without locking bolt travel. A locking device is additionally provided for locking the rotatable member in position when the bolt is locked in place. This locking device has a plunger which provides audible signals when the cam is in the fully opened position and when the mechanism is securely locked.

Abstract: A safety door latch, which can be simply and quickly disengaged in the event of an emergency, has an elongated keeper plate, which is secured to the inside of the stile of a door in proximity to the edge of the stile and substantially perpendicular thereto. An elongated slide, which is received by and releasably retained within the keeper plate, has an elongated slot therein for releasably securing a chain thereto. The proximal end of the slide is positioned within the keeper plate near the edge of the stile, and the distal end of the slide, which terminates in a clasp, is positioned within the keeper plate away from the edge of the stile. A chain is anchored at one end thereof to the striker jamb of the door and has a pin secured to the other end thereof for insertion into the slot and releasable retainment therein.

Abstract: A tri-lobular section of a bolt receives a mating tri-lobular bore of a washer to prevent the washer from rotating. Roll formed male threads on the tri-lobular section of the bolt receive a cooperating nut. The nut has a base shaped for wrench engagement, a thin walled barrel, a spring temper, and a threaded bore. The thread of the nut has two thread diameters: a large diameter thread in the base and a smaller diameter thread in the barrel continuing from the base thread; both thread sections have the same pitch. The barrel thread is substantially circular when relaxed. The barrel elastically flexes in response to the lobes of the nut as the lobes turn in the barrel, and when rotation stops, the barrel generally conforms to the tri-lobular shape of the bolt to form a thread lock, but the base does not.

Abstract: A door push-bar lock-out retainer which includes a block for mounting onto a door and it has a flexible strap for surrounding the push-bar and holding it in the door unlatched position. The strap is adjustable to accommodate various sizes of push-bars. The block has an opening which receives one end of the strap which has a latch end which is trapped in the opening by a latch member on the block. A key is utilized for releasing the strap from the latched position to thereby release the push-bar and thereby place the door in its locked position.

Abstract: The present invention relates to expansison anchors for solid wall installation and is specifically concerned with providing a self cutting expansion anchor which can be installed in one continuous motion by utilizing combined cutting blades and wall gripping members which cut their own undercut portion within a wall bore into which the gripping members are then permanently further expanded in positive locking engagement. Such dual-stage installation is achieved by utilizing an anchor mounting assembly having a pair or opposite-hand screw-threaded portions thereon which separately mount a blade expanding thrust member and a camming ramp on which the blades are initially expanded by axial movement of the thrust member toward the ramp and in the second stage causing the ramp to axially move toward the thrust member in further expanding relation to the blades.

Abstract: A screw having a tapered and offset tip with a partial thread prevents cross-threading of the screw when inserted into a nut. The offset tip is a section of a conical frustum. The axis of the conical frustum section is offset from the axis of the shank of the screw. The conical frustum section is defined by those portions of a conical frustum contained within the outer radius of the screw shank. The partial thread is located on the side of the tip facing the direction of offset of the tip.

Abstract: A fitting, for fastening with interengaged inner and outer threaded members to a channel-shaped framing member, comprises a tab projecting into the channel to abut the inner threaded member to assure properly rotated assembly of that threaded member and to prevent improper rotation if the threaded members are loosened.

Abstract: A bubble cap assembly is provided with keyways and a special keyed lock washer with locking tabs to securely fasten the bubble cap during operation in a reactor. The unique arrangement also accommodates simple removal for easy maintenance and decoking without damaging the bubble cap assembly.

Abstract: A bolt guard assembly utilizes a central sleeve and first and second end caps to separate a metal fastening nut and bolt from a pair of wood products that have been treated with a preservative. The bolt guard assembly is formed of a plastic material and prevents the metal fastener from coming into contact with the treated wood products. The central sleeve is sized to telescopingly receive crimped barrel ends of the two end caps. Each of these end caps is structured having a fastener head or nut receiving pocket which receives the head or nut of the fastener and isolates them from the wood. Fastener life is greatly increased through use of the bolt guard assembly.