Abstract: A drive nut (3,7) for a rock bolt, incorporating a nut (7) with a crimped protrusion (9), and an insert (3). The protrusion is crimped to form a plurality of lips (8) adapted to retain insert (3) in the head of the nut (7), the crimping being effected by a pressing tool having a number of preferably square bars. By this crimping technique, the drive nut (3,7) can be fabricated in such a way that the breaking torque required to expel the insert (3) from the nut (7) can be limited to a predetermined range.

Abstract: The present invention relates to a fastening system comprising a nut with a locking threadform and a nut driving system which visually marks the locking nut when the proper torque is reached. The locking nut with a locking threadform has been designed so that the major diameter thread of a typical bolt will engage a wedge ramp portion of the nut threadform thereby resisting unintentional loosening. The nut driving system of the present invention comprises a wrench socket wherein the socket contains a ball set; when the socket is used to tighten the locking nut, it visually marks the nut head when the proper torque is reached.

Abstract: A threaded fastener and method of fabrication thereof wherein the fastener or nut includes a first portion having external, wrench-engaging surfaces and a central, through bore, internally threaded for at least a portion of its length from a base surface. A wall portion extends integrally from the end of the first portion opposite the base surface, concentrically surrounding and spaced radially outwardly from the end of the bore. The first and wall portions are formed as a metal casting with the wall portion in two segments separated by longitudinally extending, V-shaped notches. The free edges of the wall segments, which initially lie in a plane normal to the axis of the bore, are deformed by a die, moving radially inward so that the wall segments are in a domed configuration with the free edges defining a substantially oval opening having a major axis with a length about equal to the diameter of the bore and a minor axis about 4/5 that of the major axis.

Abstract: The roof bolt tendon comprises a length of square twist steel with a partial thread formed directly thereon over at least part of its length. The partial thread, which may extend for the full length of the tendon and which is preferably formed by rolling, is composed of thread portions formed at the corners of the square cross-section of the square twist steel. A roof bolt in which the tendon is employed is also disclosed.

Abstract: An installation tool for use with locking fasteners which reduces cam off during use. The tool comprises a cylindrical socket wrench having a central axial bore which defines a recess on one end for attachment to a socket driver and an elliptical cavity on the opposite end for engaging the collar of the locking fastener. The installation tool further comprises one or more pockets positioned on the wrenching portion of the cavity. The pockets provide space in which collar mass is deformed. As the collar is deformed to lock the collar and bolt together, collar mass is deformed into the pockets on the tool. The deformed collar mass retains the tool and collar in an engaged position until the collar is completely deformed and the fastener is locked.

Abstract: A tamper proof sealing apparatus (10) for articles of packaging (100) wherein, the apparatus (10) includes a stud member (13) having an enlarged tab member (15) detachably associated therewith; and, a collar member (20) adapted to engage the stud member (13) in a unilateral direction; such that the collar member (20) cannot be removed from the stud member (13) without first disengaging the tab member (15) from the stud member (15).

Abstract: An electrical wire connector (10) has a C-shaped body section having arcuate ears (22) laterally therealong and converging from a wide end to a narrow end and forming wire grooves (24), a wedge having converging concave side surfaces (32) forming wire channels opposing wire grooves (24) when inserted into the wide end of the C-shaped member (12), and a shear head drive bolt (50) for urging the wedge (14) into the C-shaped member upon actuation to compress and thus interconnect respective wires (16,18) placed along the wire channels. The drive bolt (50) has an outer hexagonal head (54) joined to a smaller inner hexagonal head (56) at a frangible section to be sheared off upon achievement of a selected torque level which assures interconnection of the wires when attained.

Abstract: A mounting assembly includes an expansible anchor having a threaded bolt, an expansible sleeve, and a shank member having an internal thread that enables the shank member to be screwed onto the threaded bolt to provide for expansion of the expansible sleeve over the expander body of the threaded bolt. The mounting assembly also includes a mounting tool adapted to be clamped in a drill chuck of an impact drilling machine and the like and having an end portion shaped like a polyhedron for engaging the internal bore of the shank member which internal bore has a diameter that is less than the diameter of the internal thread.The internal bore and the polyhedron end portion has lateral faces and edges such that, when the mounting tool clamped is engaged with the internal bore and the drill operated, the shank member rotates with the mounting tool until the installation is complete.

Abstract: A delay stopper for use in a mine roof anchor is provided. A mine roof anchor has a threaded roof bolt and a threaded receiving member for the roof bolt whereby the roof bolt and the receiving member initially rotate as a unit to mix resin components that are placed in the bore hole in a destructible capsule above the roof anchor. When the roof anchor is placed in the bore hole, the destructible capsule is ruptured, and the components within the capsule are mixed to form resin which at least partially secures the mine roof anchor within the bore hole. The delay stopper causes the roof bolt and the threaded receiving member to rotate as a unit to mix the resin after the capsule ruptures. The delay stopper has a cylindrical body portion interfitting into the threads of the threaded receiving member and a conical end portion formed on the cylindrical body portion and extending axially from the body portion in a direction toward the end of the roof bolt. The delay stopper is preferably formed of an epoxy resin.

Abstract: A drive head for the screw of a scissors jack which is formed in the shape of a wing nut which has a hexagonal socket formed between opposed walls so that a conventional folding lug wrench can be used by inserting its hex tube into the hexagonal socket to drive it. In the event of overload, the lug wrench will slip relative to the wing nut so as to prevent excessive loads and stresses upon the jack.

Abstract: A self-locking fastener system comprises a pin for receipt in a hole in a workpiece and having an external thread which mates with a collar having an internal thread for carrying a tensile load. A plurality of helically extending flutes in the external thread on the pin collectively extend approximately one full revolution around the circumference of the thread. The collar has three longitudinally extending lobes for driving by a deltoid driver socket. When a desired clamp-up load is achieved on a workpiece, the socket plastically deforms the lobes and collar material radially inwardly thereof so that some of the collar material inwardly from each lobe is displaced into the void volume created by a helical flute. This displaced collar material inhibits unscrewing of the collar from the pin.

Abstract: A controlled-torque fastener limits the torque which may be applied to it for the delivery (screwing-in) of the fastener into a threaded bore of a workpiece or the like. The fastener has a threaded shaft and a tool seat which is configured to be engaged by a driving tool such as a conventional wrench. The tool seat is movable between a driving position in which the tool seat is in driving engagement with the shaft and a non-driving position in which the tool seat effectively disengages the driving tool from driving engagement with the shaft. Resilient biasing means urge the tool seat into the driving position, and driving torque applied to the tool seat urges the tool seat against the biasing force towards the non-driving position. When the driving torque applied to the tool seat exceeds a pre-selected maximum torque, the biasing force is overcome, thereby disengaging the driving tool from effective driving engagement with the shaft, and discontinuing delivery of the fastener.

Abstract: The invention is a flush head fastener for joining two or more structural elements together. The structural elements have a fastener hole therein with one of the structural elements being countersunk to accommodate the head of the fastener. The fastener includes head and shank portions and a layer of material joined to the top of the head of the fastener which can readily be deformed to fill any gaps between the head and the countersink. Thereafter, the excess material can be removed leaving an aerodynamically smooth surface. The surface also will have no electrical discontinuities. The procedure for installing the fastener includes the steps of (1) providing two or more structural elements having a countersunk fastener hole therein (2) thereafter the fastener is installed in the hole (3) the layer of material is deformed so as to fill any gaps between the head of the fastener and the countersink, and (4) thereafter, excess material is removed leaving a smooth external surface.

Abstract: A tamper proof fastening device includes a threaded portion, a tool engageable portion for engagement by a tool for rotation of the device and drive coupling means coupling the engageable portion and the threaded portion for transmission of rotation from the engageable portion to the threaded portion. The drive coupling means is frangible upon application of a torque in excess of a predetermined torque to the engageable portion. After fracture, the engageable portion is rotatable on the threaded portion without application of substantial torque thereto. The engageable portion includes a generally cylindrical bore and an annular inwardly directed flange at one end of the bore. The threaded portion is provided with an abutment adapted to engage with the flange to restrict against axial separation of the threaded portion and the engageable portion in a direction.

Abstract: A brake shoe for a drum brake assembly such as those used in bus and truck applications comprising a brake pad assembly having at least one pad element having a continuous external surface, a mechanism for positioning the pad element relative to the brake drum of the drum brake assembly, and a mechanism for securing the brake pad assembly to the positioning mechanism, the securing mechanism including an alignment mechanism to align the brake pad assembly and thereby the brake pad to the positioning assembly. An alternate embodiment of the securing mechanism includes a failure element that enables the forces utilized for securing the brake pad assembly to the positioning assembly to be automatically controlled and prohibits tampering with the resulting assembly.

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 self-locking nut is provided having, at its periphery, a number of longitudinal channels (3) with semi-circular section intended to cooperate with drive balls carried by an appropriate tightening tool, said balls causing, at the end of tightening, the formation of a circular groove (10) by forcing back the metal situated between the channels (3), which results in radial deformation of the inner threads of the nut (1) at the level of said groove (10).

Abstract: A fastener-carrier system comprises at least one metallic threaded fastener member including a head portion, a tip portion and an externally threaded shank portion intermediate the head and tip portions and defining an axis. A carrier strip comprises a substantially flat, elongate member of a moldable material and the fastener head portion is moldably embedded into the carrier strip with the tip and threaded shank portions projecting outwardly of the carrier strip. The carrier strip includes a substantially flat workpiece-engaging surface, with the fastener extending outwardly thereof for extending into a receiving aperture in a facing workpiece surface. A raised, elastically deformable skirt portion is provided on the workpiece-engaging surface surrounding each fastener for positively engaging the workpiece surface and for deforming sufficiently thereagainst to form a seal completely around an otherwise exposed portion of the fastener at the workpiece-engaging surface.

Abstract: An anchor for secure reception of a fastener such as a screw shank can be frictionally welded, by high-speed rotation of the anchor, to the structure upon which the fastener is mounted. The anchor is molded from frictionally meltable material, for example a typical engineering thermoplastic such as ABS resin. The anchor has a generally cylindrical body with an end face at one end defining a surface for frictional welding to the compatible structure. The end face has an aperture which receives the screw shank or the like. The cylindrical body has a cup-like configuration having a cavity formed therein extending from the end face to an open end at the opposite end of the cylindrical body. A cylindrical boss is formed within the cavity and extends from the aperture at an entrance end for receiving the fastener. The boss has a frangible cap covering the end of its bore opposite the entrance end.

Abstract: A nut in combination with a deformable plastic plug is provided so as to produce a torsional reistance when the nut is screwed onto a similar male thread such as a bolt. The plug comprises an inner core wedge and an outer sleeve which will expand upon insertion of the core. The sleeve is placed into the nut, leaving at least one complete turn of the thread free, and the core is wedged into the sleeve forcing it to deform into the thread.

Abstract: A nut member of special design is disclosed in conjunction with other elements to provide a post-tensionable mine roof support assembly. The nut member includes an upper, stem portion extending through the opening in a support plate and a lower, base portion of larger diameter than the plate opening. A through opening in the nut includes an internally threaded portion at the upper end of the stem and an internal socket for wrench engagement at the lower end of the base. Between the threaded portion and socket is an internal bore having a diameter greater than the threaded portion. Breakable means, preferably annular in form and cast integrally with the rest of the nut member, extends into the bore to a position with the cylindrical plane extending downwardly from the threaded portion.

Abstract: A dowel for insertion into a borehole in a structural unit includes a dowel body and a spreading member. The dowel body is axially elongated and has a cylindrically shaped outside surface with a bore extending axially through the body. The body is formed of a sintered dry powdered metal made up primarily of iron and having a weight in the range of 5 to 7 g/cm.sup.3. Phosphorus in the range of 0.1 to 1% can be added to the dry powdered material to increase its cohesion. Further, the sintered material can be reinforced with fibers. An axially extending portion of the bore is conically shaped and the spreading member is similarly conically shaped for radially expanding the dowel body within the borehole.

Abstract: This specification describes a new anchor or rock nut which is used in association with an anchor bolt to rupture packages of two or more component setting mixtures. The nut is characterized by having a plug of thermosetting resinous material formed in situ which plug may be removed by the anchor bolt when screwed into the nut under the application of a pre-determined force which cause the plug to crumble; however until the predetermined force is reached the nut will cause the bolt to rotate.

Abstract: A threaded pin has flutes along the threads formed by roll-forming threads over a preformed section having either flat sides or dished sides. The major diameter of the threads lies along ridge crests bordering the flutes, and the minor diameter of the threads lies at the base of the flutes. The threads extend along the major diameter in each of the ridge crests for a distance on an order of magnitude of the distance across the mouth of each flute. The preformed section is formed by extrusion. The flutes provide space for material from a threaded collar forced into them to provide a thread lock.

Abstract: A fastening nut, which by virtue of precisely located laser cuts and the application of predetermined torque to a grip member, is enabled to break into several parts, one of which can be used as a jam nut. The nut is provided with an internally threaded sleeve, a grip member and interconnecting means, the latter of which may be provided with one or more shear areas by virtue of a series of laser cuts. At a predetermined torque on the grip member, the sleeve is sheared from the interconnecting means and grip member and, as a second embodiment, the interconnecting means may be provided with internal fastening threads so that further torquing of the grip member drives such interconnecting means into the sleeve and thereafter a second shear separation is effected to remove the grip member from the jam nut.

Abstract: A torque limited threaded locking fastener and a method for setting it to form an assembly. The fastener comprises an externally threaded shank and an internally threaded collar. At least one convolution of the threads on the shank is non-circular. The collar has a nut section and a drive section. The drive section is shaped to be engaged by a driver. Between these sections there is formed a shear section having the least torque resistance of the sections. The shear section fractures when a predetermined torque is exerted between the two sections. The nut section has an internal thread engageable to the shank thread, and an external rib engageable by a swaging tool. The swaging tool radially inwardly deforms and displaces the rib so as to displace nut section material at the non-circular convolution whereby to lock the nut to the shank after, but only after, the drive section is torqued off.

Abstract: This invention relates to an anchor bolt expansion unit and the bolt assembly using such a unit. The unit consists of a plurality of leaves connected together by a bail having a flat cap and fingers secured one to each leaf. The flat cap is dimpled to ensure an even distribution of tension applied to the fingers before the bail yields in use and also has a line of weakness to ensure that it will yield at a predetermined axial pressure. The fingers of the bail are also weakened at points in their length to a strength slightly greater than that resulting at the peripheral line of weakness.

Abstract: A collar threads onto a shear pin. When the collar engages a surface of a workpiece, resistance to further threading increases. When sufficient resistance to threading occurs, a setting driver upsets lobes of the collar and forces these lobes radially inward toward the axis of the collar. Material of the collar inside the lobes responds to deformation of the lobes and flows radially inward against the shear pin to lock the collar, shear pin and workpiece together. The driver then rotates freely and a joint has been made with a predetermined clamp-up load and its component parts locked together.