Abstract: A heavy duty fastener is provided especially suitable for outdoor uses such as in heavy timber including utility poles. For example, it may be in the form of a staple for securing a telephone ground wire cover to a pole. It has along each leg or prong a series of longitudinally spaced interlock notches for engagement therein of the severed bent-in edges of growth rings of the timber member in which the fastener is secured, the notches having shoulders facing generally toward and interlocked with the severed edges which thoroughly resist withdrawal of the fastener from the wood member.Tearing of the fiber structure of the wood during driving in of the fastener is minimized by having all laterally projecting surfaces along the prongs smoothly rounded, including shoulder lips and lateral side shoulder projections generally aligned with the notches.Manufacture of the fastener by coining of the interlock notches is facilitated.

Abstract: An anchor bolt having an expandable housing containing a fluid material and disposed in a casing arrangeable extending through a floor or other partition. Compression of the fluid material in the expandable housing causes the material to expand the housing through one or more slots provided in the casing and prohibit the housing from passing back through the floor.

Abstract: A tensile member such as a bolt fastener comprises an elongated body formed with an open-ended longitudinal bore extending through an intermediate region of the body. A tubular sleeve and a test rod extend coaxially into the bore and are secured therein at longitudinally spaced positions within the intermediate region. The tubular sleeve and the test rod each have a free end adjacent to the open end of the bore. Tensile stress within the intermediate region of the body of the tensile member is measured by measuring relative longitudinal displacement between the end faces of the sleeve and test rod at their free ends.

Abstract: The split bolt comprises plural bolt segments having threaded outer surfaces which are brought radially together to render the bolt insertable into a complementary threaded recess, and spaced radially apart to cause the bolt threads to become engaged when an elongated, generally cylindrically shaped wedge member is inserted between the segments to space them into the threaded engagement. The wedge member has plural camming surfaces along the length thereof which engage corresponding camming surfaces on the inside surfaces of the bolt segments. Further, the bolt segments are interconnected by an elastic means which surrounds the segments and keeps them in surface contact with the wedge member inserted therebetween.

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.

Abstract: A screw having a shank and a tapered portion with an especially sharp point for attaching gypsum board to metal building studs having multiple threads occuring within the other in the body portion. In the tapered portion of the screw one of the threads gradually decreases in diameter and fades into the tapered portion of the shank and terminates. The other thread continues on toward the point end, decreases in diameter and fades into the tapered portion of the shank at a point nearer the pointed end of the screw.

Abstract: An improved fastener system is derived for cold working the surfaces defining aligned fastener holes in structural members and installing fasteners therein. Essentially, an integral fastener and mandrel construction facilitates the insertion of a sleeve into the holes, an expansion of the sleeve thus disposed to thereby cold work the surfaces of the members defining the holes, and the pulling of the fastener into the holes thus prepared and sleeve-lined. A frangible neck is provided between the fastener element and the mandrel element which permits the breaking off and discarding of the latter after the former is installed. Retenion means is then installed, formed or otherwise provided on the fastener end in conventional manner. Thus, cold working and fastener installation is accomplished in only two steps due to the critical design and configuration of the combined fastener, break-off groove and mandrel.

Abstract: Doors such as garage doors are commonly mounted with respect to a door opening so as to be capable of being moved between a closed position in which such a door extends vertically across the opening and an opened position in which such a door extends substantially horizontally adjacent to the top of the door opening. An auziliary door such as a screen door for enclosing such an opening when such a principal door is in an opened position may be mounted on such a principal door so that it is capable of being moved along with the principal door between the opened and closed positions of the principal door and so that it can be moved to enclose the door opening when the principal door is in an opened position.

Abstract: A double break-off screw fastener is described, which conceals its mode of fastening by means of a "dummy" free-floating middle shaft. The inventive screw contains three sections, a threaded section which does the actual fastening; a middle shaft section which helps to internally fasten the threaded section before breaking-off; and an outer head section which breaks from the middle shaft, thus leaving the middle shaft in a free-floating state. To the outer observer, the middle shaft is free turning giving the impression of a fastening screw. In reality, however, it is nothing more than a dummy member, which carefully conceals the well hidden internal screw thread.

Abstract: A self-drilling and blind setting rivet assembly for power tool application to workpiece means including a hollow rivet sleeve with an enlarged head at one end. A mandrel with a drill point at one end positioned through the bore of the sleeve so that the drill point on the mandrel is positioned adjacent the end of the sleeve opposite the head portion. The mandrel shank will have a weakened portion of reduced cross-sectional area with the inner periphery of the sleeve and outer periphery of the shank including cooperating torque transmitting surfaces on either side of the weakened portion of the shank to allow torque to be applied directly to the shank with the torque transmitting means serving to bridge the weakened portion of the shank to enable the drill point to drill a hole and yet allow the shank to fracture upon appropriate tensile force during the setting operation.

Abstract: The embodiment of the invention disclosed herein is directed to a door handle anchor which can be placed behind the panel of a sheet metal door and has prongs formed thereon to extend through an aperture formed in the door. A threaded fastener is inserted between the prongs and threaded into a bore in alignment therewith. The prongs are urged outwardly to prevent pushing the anchor back through the aperture during threading of the fastener. The anchor is formed of a molded plastic component having an integral arm extending a distance sufficient to engage a sidewall formed by turned edge of the door receiving the same.

Abstract: A nail constructed with conventional heading equipment with an open-sided partially circular head having a recess along the open-sided edge thereof to permit burr growth without interfering with the interengagement of a downwardly facing abutment surface of the head with a mating top surface abutment area when a plurality of such nails is collated and secured in an angle stick package with the shanks and heads of adjacent nails in abutting relation.

Abstract: A clamp for securing a cable connector on a battery post to prevent the loosening of the cable connector. The clamp comprises a base formed with a perforation adapted to slide over a battery post. A pair of arms extend spacedly of said base. Means are provided for tightening the arms against the cable connector to secure it on a battery post.

Abstract: A finger guard assembly is structured for easy field retrofitting to a standard center-pivot door without removing the door from the doorway. The assembly includes a pair of extruded jamb guard members flush mounted on a doorway jamb and a pair of extruded door guard members flush mounted on the opposite parallel surfaces of the door stile. The jamb guard members and door guard members are shaped and positioned to cooperatively provide a narrow gap for preventing the entry of fingers therebetween. The several guard members are temporarily supported in position on the jamb and door by double faced adhesive tape preparatory to final mounting.

Abstract: Disclosed is a screw grommet which is used to bolt an object to a plate or the like. The unique structure of a screw grommet according to this invention permits frictionless insertion of the leg of the grommet in an aperture of the plate and at the same time, positive engagement with the circumferential edge of the aperture of the plate.

Abstract: A self-drilling fastener includes a shank having a drill tip integrally formed on one end thereof and a head on the other end. The drill tip is defined by two concave grooves formed one on each side of the shank and intersecting with two planar heels formed on the end of the shank to define two cutting edges. Each of the cutting edges is formed with a positive rake angle along the entire length thereof with the rake angle increasing in magnitude upon progressing outwardly along the cutting edge and toward the periphery of the shank. The axes of the grooves are straight and form an acute included angle bisected by the axis of the shank. The heels also intersect at an angle bisected by the axis of the screw, the edge of intersection of the heels defining a chisel edge at the tip of the shank.

Abstract: The threads at the entrance end of a nut are interrupted by a plurality of circumferentially spaced axially extending flutes to form relatively flexible load distributing threads. The flutes extend axially across a limited number of threads and extend radially into the threads a distance short of the root of the thread. After engagement with a complimentary bolt, and upon the occurrence of a load on the connection, the interrupted threads flex axially of the nut to cushion shock on the bolt threads and shift the zone of maximum stress transfer axially inwardly of the nut, thereby materially extending fatigue life of the connection.