Abstract: A compression screw driver system including a drive member having a shaft extending from a proximal end to a distal end. A drive selection member is positioned about the shaft and is axially moveable along the shaft between an engagement position and a disengaged position. A distal portion of the drive selection member defines a first engagement structure. A compression sleeve is positioned over the distal end of the shaft. The proximal end of the compression sleeve defines a second engagement structure which complements the first engagement structure and the distal end of the compression sleeve defines a contact surface. In the engagement position the first and second engagement structures are engaged and the compression sleeve rotates with the drive member and in the disengaged position the first and second engagement structures are disengaged and the compression sleeve remains stationary while the drive member rotates.

Abstract: Connection devices for connecting together a filter, a regulator, and a lubricator, which constitute a fluidic unit, are each provided with: a base member having a hole; a pair of first and second fastening members which are mounted to one side surface and the other side surface of the base members; and first and second holders held by the first and second fastening members. The first and second holders are engaged with the engagement protrusions of the filter, the regulator, and the lubricator, and first and second nuts are engaged with the first and second fastening members through threads to connect the fluidic devices together through the first and second holders. Caps are fitted over the first holders and the first nuts.

Abstract: A surgical instrument system and method of use is disclosed. The system includes a bone fixation pin and a surgical instrument configured for use with the bone fixation pin. The surgical instrument includes a sheath extending over the distal end of an elongated shaft and a locking mechanism operable to permit selectively movement of the elongated shaft along the longitudinal axis relative to the sheath.

Abstract: An electrical connection for an electrical component or electrically heatable honeycomb body, in an exhaust system of an internal combustion engine includes an electrical conductor passing through a metallic jacket of the exhaust system, a bushing and an insulating layer and having an outer connection section with circular cross section. The connection section has a contact surface for connection to a supply line connection piece. The bushing and/or electrical conductor near the bushing can absorb torques up to 3.6, 4.5 or 7 Nm per cm2 of contact surface acting on the connection section and/or an internal or external thread in circumferential direction, by shaping the electrical conductor near the bushing or using structures and/or changes to the cross section or a form-locking construction of the electrical conductor and the bushing. Damage to electrical exhaust components due to external torques, disassembly and maintenance can thus be avoided.

Abstract: A fastener comprises a body having an enlarged head at a first end, a tapered ramp at a second end, a cylindrical shank disposed between the enlarged head and the tapered ramp, internal threads, and a cylindrical passage formed through the body between the first and second ends. The fastener further includes a generally cylindrical corebolt having first and second threaded sections separated by a third non-threaded section, the corebolt disposed within the passage of the body and a sleeve having a generally cylindrical passage therethrough and movably disposed over a portion of the corebolt. A nut is in threaded engagement with the corebolt and is disposed adjacent an end of the sleeve. An interface between the corebolt and the nut is configured to resist relative rotation of the nut with respect to the corebolt until the sleeve is in abutment with a workpiece.

Abstract: A locking nut includes a nut top, a nut middle, and a slip section. The nut top includes an integrally-formed bushing. The nut middle includes a threaded central bore suitable for threaded engagement on a threaded installation bolt, as well as a plurality of ratchet gears on an outer surface where each gear has a respective first slip surface and a first drive surface. The slip section includes a plurality of cantilevered posts having a respective free end, wherein on each post are formed a respective second slip surface and a second drive surface. When the slip section is rotated in a tightening direction, the slip section and the nut middle rotate together until a torque threshold is reached, where the second slip surfaces override the first slip surfaces to limit the applied torque. The locking nut includes structure to produce sound when the torque threshold has been reached.

Abstract: This disclosure relates to a frangible fastener configured such that a first end of the fastener separates from a second end of the fastener responsive to a breaking force. The fastener may comprise a head portion, a frangible portion, a tool engagement portion, a threaded portion, and/or other portions. The frangible portion may include a frangible body. The frangible body may form a plurality of through wall cuts. The frangible portion may be configured such that the breaking force is proportional to a quantity of through wall cuts, a cross sectional area of through wall cuts, and/or a shape of through wall cuts. The frangible portion may be configured such that the breaking force is proportional to a wall thickness of the frangible body. The location of the tool engagement portion may minimize and/or eliminate torsional loading of the frangible portion during tightening with a tightening tool.

Abstract: A screwable element (10) for fastening an object, in the form of a plastic conduit for example, to a counterpiece such as a connection to another conduit or a device connection, consists of a first part (14) rotatable manually or with a tool, and a second part (16) furnished with a threaded portion (15), wherein the first and second parts are rotatable relative to one another about the longitudinal axis (18) of the screwable element, but can be fixed to one another axially via a connection point (20), and a unit (24, 26) limiting the torque that can be transmitted from the first part onto the second part. Said unit comprises at least one spring part (24) that is rotatable with the first or the second part, is resilient in a direction parallel to the longitudinal axis of the screwable element and cooperates with detents (26) of the respective other part.

Abstract: An anchor includes a rotatable anchor rod an anchor plate and an anchor nut. The screw thread in the anchor nut matches the screw thread of the anchor rod only over part of the screw thread hole. Thus the anchor nut can only be screwed some way further onto the anchor rod, and up to a predetermined torque can be used for rotating the anchor rod during placement of the anchor. As soon as the anchor rod is firmly seated in the drill hole, as a result of the action of adhesive, mortar or expansion or spreading, the anchor rod forms a through-thread in the screw thread hole when the anchor nut is rotated relative to the anchor rod, and consequently the anchor nut can finally be screwed onto the anchor rod until it affixes the anchor plate in its final position to the ground.

Abstract: A torque-limited fastener turnable in fastening and loosening directions for one-time use includes a fastener head with a base, a set of lugs extending from the base, and an optional set of ramps extending from the base. The lugs include abutment surfaces facing a fastening tool slot recess that receives a fastening tool. When the fastening tool is turned in the fastening direction it bears against the lug surfaces. The lugs shear off or plastically deform into recesses when the fastening tool applies a limiting fastening torque. The ramps have abutment surfaces facing a loosening tool slot recess that receives a loosening tool. The ramps cam the fastening tool over the ramp abutment surfaces if the fastening tool is in the fastening tool recess and is turned in the fastening direction after the lugs have sheared off or have plastically deformed in response to application of the limiting torque.

Abstract: One or more embodiments of the present invention relate to a torque-limited attachment device, having a first head piece with at least one shaped element for the purpose of establishing a positive-fit connection to an attachment tool, and having a second head piece which has at least one threading, wherein both head pieces are connected to each other, forming at least one predetermined breaking point which breaks at a limit torque between the two head pieces such that a first breakaway surface, the same being functionally assigned to the first head piece, and a second breakaway surface, the same being functionally assigned to the second head piece, are created, and wherein at least the second head piece has a base material inside, the same having a corrosion-resistant surface coating.

Abstract: A bolt assembly is provided with a bearing seat, a screw, a pull member and a cover. The bearing seat has a through hole, a concave portion and an accommodation room. The screw is coupled to the bearing seat. The screw includes a threaded portion, a head portion and a pull groove. The threaded portion extends out of the through hole. The head portion is positioned in the concave portion. The pull groove is located corresponding to the accommodation room. The pull member is located on top of the bearing seat. The pull member has at least one pull point at a lower end thereof. The pull point extends in the accommodation room and is located corresponding to the pull groove of the screw. The cover is adapted to cover the bearing seat and confines the pull member in the cover.

Abstract: A hinged clamp provides quick connection and disconnection of sections of fluid tubing. Some embodiments include a spring-loaded catch mechanism that enables the clamp to be loosely latched, and a winding mechanism that can retract the catch to a securely latched condition. Other embodiments provide a hinged shaft that pivots about an end of the upper clamp ring. A middle section of the shaft can be inserted into a slotted opening in the lower clamp ring, and the winding mechanism can move an engagement surface against the lower clamp ring to securely latch the clamp. An adjustment mechanism is included in these embodiments which can adjust the amount of winding required to engage the clamp. In various embodiments, less than one turn or less than one-half turn is required to engage/disengage the clamp. The clamp can be openable only just enough for insertion of flanged ends of the tubing sections.

Abstract: A torque nut includes a threaded passageway and a groove. The groove has its opening facing the passageway. A breakaway insert having a major body portion is formed in the passageway, and a tab connected to the major body portion is formed in the groove, for example, by injection molding. The tab connected to the major body portion prevents rotation of the insert in the passageway. In one use, a resin component, a catalyst component and a first end of a rock-bolt are positioned in a bore hole. The torque nut is threaded onto the opposite end of the rock-bolt. Rotation of the torque nut rotates the rock-bolt, mixing the components. After the components set, increased torque is applied to the torque nut to fracture the insert and move the nut up the threaded end of the rock-bolt against roof stabilizing components.

Abstract: A wireless breakage indicator for a shear pin having an axial bore. The indicator (10) comprises a stem (20) having a head (22) and a foot (24) at opposite ends thereof; a sleeve (32) around a portion of the stem between a first (28) and second (30) axial positions, the stem (20) and sleeve (32) adapted to be broken by the shear pin (12) in the event of its breakage; a spring (26) compressed between the head (22) of the stem (20) and a first end (34) of the sleeve (32); the foot (24) of the stem (20) being retained to the second end (36) of the sleeve (32). The breakage of the stem (20) frees the head (22) to be displaced by the spring (26) and indicate breakage of the shear pin (12). The indication can be direct, by visual inspection of the displaced head, or indirect by the displacement of the head activating a transmitter.

Abstract: A set of a bolt and a nut having a rotation prohibiting mechanism comprises a foldable part (30) at the tip of a bolt (20), that can be folded around an axis perpendicular to a bolt axis. A tip portion (30) can be folded to either sides with the direction extending along the bolt axis as a center. Grooves (18a-18g) for storing the foldable part (30) are formed on a tip surface (a surface from which the tip of the bolt projects out when the bolt and the nut are tightened) of the nut (12) or the knob (18). A number of the grooves is an odd number. The grooves are arranged radially with equal angular intervals with a center at a screw hole of the nut. For example, seven grooves are arranged radially with equal angular intervals. In this case, the angle between adjacent two grooves is about 51.4 degrees, and this angle is to be an expected angular resolution of the rotation prohibition. However, according to the above mentioned set of the bolt and the nut, the expected angular resolution can be halved (i.e. 25.

Abstract: The invention relates to an anchor nut (1) that is made of fiber-reinforced plastic and comprises an internal thread (6) to be screwed onto a thread of an anchor (16). Said anchor nut (1) has external contours or shapes, by means of which the anchor nut (1) can be screwed onto an anchor winding with the help of a positively acting tool. One end of the anchor nut (1) is fitted with a first torque limiting means (7) which prevents a partially screwed-in anchor (16) from being further screwed in at a torque lying below a first torque limit, while the other end thereof is fitted with a second torque limiting means (8) that prevents torque from being further transmitted to the anchor nut (1) via the positively acting contours or shapes when a second torque limit has been reached or is exceeded. The first torque limiting means is formed by a pin (7) which penetrates the internal thread (6) perpendicular to the longitudinal axis of the anchor nut (1).

Abstract: Inventive embodiments are directed to components, subassemblies, systems, and/or methods for continuously variable transmissions (CVT). In one embodiment, a main axle is adapted to receive a shift rod that cooperates with a shift rod nut to actuate a ratio change in a CVT. In another embodiment, an axial force generating mechanism can include a torsion spring, a traction ring adapted to receive the torsion spring, and a roller cage retainer configured to cooperate with the traction ring to house the torsion spring. Various inventive idler-and-shift-cam assemblies can be used to facilitate shifting the ratio of a CVT. Embodiments of a hub shell and a hub cover are adapted to house components of a CVT and, in some embodiments, to cooperate with other components of the CVT to support operation and/or functionality of the CVT. Among other things, shift control interfaces and braking features for a CVT are disclosed.

Abstract: The fastener assembly comprises a torquing member and a clamping pressure member assembled together on a common axis. The torquing member has threads formed around the axis. An annular bearing surface extends around the axis on one end of the member. The clamping pressure member has an annular bearing surface formed around the axis on one end and an annular clamping surface extending around the axis on an opposite end. The annular bearing surface of the torquing member includes a first series of helically inclined surface segments extending about substantially the same axis as the threads and a second series of helically inclined surface segments extending about substantially the same axis as the threads but provided with a pitch substantially equal to or greater than that of the threads, with an opposite incline.

Abstract: A multi-part, self-drilling, self-tapping fastener with on board, internal chambered adhesive for, permanently connecting a plurality of parts at an overlaid joint thereof having access from one side. The fastener, that drills its own hole through the joint and taps its own threads for mechanically connecting the parts and subsequently extrudes the adhesive under pressure for optimized joint adhesive infiltration and bonding area for maximizing joint strength. The mechanical fastener holds the parts together eliminating the requirement for holding with auxiliary fixtures allowing the parts to be finished and painted during adhesive cure.

Abstract: A device (41) for positioning a joinery fastener (74) in a joinery member (33) for later use in forming a joinery assembly. The fastener positioning device (41) includes a feed magazine (82) formed for feeding joinery fasteners (74) to a gripping apparatus (83). The gripping apparatus (83) is positioned to receive the fasteners (74) and is further adapted to releasably grip individual fasteners (74) at a position (103) below the fastener head (86) to hold the fasteners (74) in a known and controlled, indexed relation to the gripping apparatus (83). The gripping apparatus is movable between a fastener gripping position to a fastener placement position while the pointed end (88) of the fastener (74) remains in indexed relation, and a placement arm (92) is formed to urge the fastener (74) from the gripping apparatus (83) and into interference fit with the joinery member (33).

Abstract: A method and apparatus for making a nut having a first end, a second end, and defining an orifice extending between the first end and the second end. A plurality of first threads are positioned in the orifice defined by the nut body, and a malformed thread is positioned in the orifice defined by the nut body, wherein the malformed thread interrupts continuity of at least one of the plurality of first threads.

Abstract: A method of installing fastening elements, and rivetless fasteners for use with the method. Rivetless nutplate fasteners are installed in metal structures by providing flush fit barrel shaped plug or bushing portions in a hole in the structure as defined by an edge wall. The barrel portion is acted upon axially, and expanded radially outward toward the edge wall of the hole, to provide an interference fit. The ends of the barrel portion are machined as desired for flushness. Also, a hole is installed as necessary. Rivetless nutplates are easily installed, and the installation enhances fatigue life of the hole surrounding the barrel of the nutplate.

Abstract: A hitch pin used for releasably connecting a load carrier frame to a receiving hitch attached to a carrying vehicle for transporting objects such as bicycles on the load carrier. The hitch pin includes a bolt having a head portion opposite a threaded section and a stem integrally formed between the head portion and the threaded section. A sleeve includes a bore, sized to receive the head and the stem of the bolt which is slidably held inside the bore of the sleeve using a transverse pin, secured inside the bore of the sleeve and passing through an elongate slot in the stem of the bolt. When the sleeve is rotated, the transverse pin transmits the rotation to the bolt providing the turning motion used during connecting of the frame to the receiving hitch. The connection may be made in two stages with hand-tightening as the first stage, followed by application of mechanical force, operating from a set screw, through the bolt to intensify the contact between the frame and the receiving hitch.

Abstract: A metal material subjected to a treatment for seizure prevention is provided. The metal material includes a metal base material and a film formed thereon, the film being composed of a carbodiimide group-containing resin obtained from an aromatic polyisocyanate or of a mixture of said carbodiimide group-containing resin and a lubricant. A method for producing a metal material subjected to a treatment for seizure prevention is also provided. The method includes coating, on a metal base material, a carbodiimide group-containing resin obtained from an aromatic polyisocyanate or a mixture of said carbodiimide group-containing resin and a lubricant, and then subjecting the coated metal base material to a heat treatment at a temperature of 120° C. or higher.

Abstract: There is provided a torque limiting device to be used in screw fasteners. The device comprises a torquing head defining an internally threaded bore. The torquing head further defines an upper collar having a greater outer diameter than its lower section which section is adapted to receive a hexagonal nut thereover. A laser weld, functioning as a shearing element interconnects the torquing head and the hexagonal nut.

Abstract: In a screw for fastening metal sections (10) to a substructure (11), a shank (2) is provided with a threaded portion (5) and a drive portion (3) for applying a driving device. The portion of the shank (2) adjacent to the drive portion (3) flares conically toward the drive portion (3). The thread (5) engages in the substructure (11), whereby the conical portion (6) is pulled into contact with the section (10) and presses it against the substructure (11). By virtue of appropriate friction, the torque is increased to an appropriate level, and so torque-dependent stopping of the driving action can be achieved.

Abstract: A coupling mechanism (1) has a threaded body (12) adapted to establish a threaded coupling when rotated, a housing (2) being rotatable by the application of torque thereto, a thrust member (6) coupling the threaded body (12) and the housing (2) for rotation together until a torque limit is attained, and the thrust member (6) decoupling from the threaded body (12) by displacement of the thrust member (6) against frictional resistance of peaked ridges (16) and a bias by a resilient spring (5).

Abstract: This invention has as its purpose the provision of a clamp screw in which the loss of clamping force is greatly reduced, a powerful clamping force can be obtained with a small rotational input, a sufficient clamping force can be obtained by a manual operation, and moreover, a sufficient clamping force can be obtained without excessive clamping by making effective use of the reverse thrust of the rotating tool.With the clamp screw of the invention, when the flange ring is in contact with the object to be attached, the rotation of the threaded member stops and a clamping state is entered, the rotation of the operating ring is screw fed by the balls moving around the thread grooves, and as a result of this movement of the operating ring due to the screw feed, pressure is exerted on the flange ring through the restraining ring thus clamping the tool to be attached.

Abstract: The invention relates to a fastening element with a torque-limiting function, comprising on the one hand a fastening member (2, 2') with working threads (4), that is to say threads which are active for the fastening function of the element, and on the other hand a gripping member (3, 3') which is arranged so as to be capable of being turned with the aid of a spanner, wrench, screwdriver or other tool for attaching the fastening element (1, 1') and connected or connectable to the fastening member (2, 2') via torque-transmitting threaded connection (5, 6/17, 18) with sufficient strength in order to be capable of transmitting to the fastening member torque of the size for which the fastening element is intended, and in which the gripping member is arranged to be unscrewed and turned relative to the fastening member, on attachment of the fastening element, only when the torque exceeds a given predetermined torque.

Abstract: A rotatable device, such as a screw, a bolt, etc., comprises a cylindrical clip (4) inserted into a bore (3) in the head of the rotatable device. The clip (4) is compressed to a certain extent when inserted into the bore in order to confer to the clip a springing effect on the wall of the bore. Further, the clip comprises a socket for the insertion of a suitable turning key. When turning the key, only a maximum torque is transferable to the rotatable device. If this value is exceeded, the clip starts sliding in the bore.

Abstract: The invention relates to a fastening element with a torque-limiting function, comprising on the one hand a fastening member (2, 2') with working threads (4), that is to say threads which are active for the fastening function of the element, and on the other hand a gripping member (3, 3') which is arranged so as to be capable of being turned with the aid of a spanner, wrench, screwdriver or other tool for attaching the fastening element (1, 1') and connected or connectable to the fastening member (2, 2') via a torque-transmitting threaded connection (5, 6/17, 18) with sufficient strength in order to be capable of transmitting to the fastening member torque of the size for which the fastening element is intended, and in which the gripping member is arranged to be unscrewed and turned relative to the fastening member, on attachment of the fastening element, only when the torque exceeds a given predetermined torque.

Abstract: Fastening plug (10) made of plastic for fastening in a corresponding bore, especially for fastening furniture hardware on furniture, with an elongate stem portion (14) which can be releasably fastened on the associated hardware piece, from whose outer circumferential surface a number of annular projections (16) offset lengthwise on the stem having a triangular cross section tapering outwardly, each forming a knife-edge-like holding burr (18). The outside diameter of the holding burr is greater than the diameter of the corresponding bore, while the stem portion (14) has between the first annular projection (16) on the hardware end and the end facing the hardware a neck (20) whose diameter is smaller than the diameter of the corresponding bore.

Abstract: A rock anchor includes an elongate element. A transverse dimension of a portion of the elongate element is enlarged. The transverse dimension is reducible on the application of a suitable force applied to the enlarged portion. The invention extends to a tensioning device for use with the rock anchor and to a yielding anchor assembly which includes the rock anchor and the tensioning device.

Abstract: A rockbolt for anchoring in a borehole and then tensioning it has a nut at its distal end whose screw threaded engagement with the rockbolt is utilised to force the nut against the surface at which the borehole is provided and cause tensioning of the rockbolt. Initially, the nut cannot be run down the rockbolt owing to provision of a disc seated in a recess at the distal end of the nut and which is only forced out from the recess when the nut is subject to a minimum predetermined torque. Holding of the disc in the recess is achieved by deformations of the nut resulting in the perimeter of the disc being frictionally restrained.

Abstract: A spring loaded screw and an associated driver for use in orthopedic applications, particularly for temporarily securing cutting guides and the like to the tibia and femur for preparation of the bone surfaces in a total knee replacement. A slidable sleeve on said screw is spring biased away from the driver. As the screw sleeve seats, the sleeve slides upwardly against the compression spring to disengage the driver from the proximal end of the screw. The driver contains a slidably disposed central cylinder which can be axially moved by sliding an externally mounted sleeve. To retract the screw, the driver sleeve is advanced toward the screw to urge the cylinder toward the proximal end of the screw sufficiently far to enable grasping of the proximal end of the screw for retraction thereof.

Abstract: Six lobes of a nut have axial surfaces falling on six tangent cylinders of equal radius and having axes lying on a right cylinder concentric with the axis of the nut. The surface of a second concentric right cylinder having a radius greater than the first defines furrows between the lobes. Successive lobes are tangent to an imaginary flat surface and the furrows are spaced away from the surface inside it.

Abstract: An improved deformable locking fastener system comprises a bolt, a deformable collar and an installation tool. The bolt has a threaded exterior for engaging the collar. The collar has an axial bore threaded to engage the bolt. The exterior of the collar is defined by a central portion and a head portion. The central and head portions preferably have an elliptical shape with the central portion slightly greater in size. The central portion and the head portion are deformed from their elliptical shapes to substantially round shapes to securely fasten the collar and bolt. The central portion advantageously generates a predetermined preloaded tension between the collar and the nut. The head portion locks the collar and bolt together because it is swaged or deformed into recesses on the threads of the bolt. A tool is used to secure the collar on the bolt.

Abstract: Wrenching lobes of an internally threaded nut are separated by circumferential, tapered walls so that the lobes and contiguous portions of the walls deform in radial compression upon reaching a predetermined preload and displace radially inwardly while the central portions of the walls deform radially outwardly, but do not interfere with the tool that sets the nut.

Abstract: Axially-extending troughs in a bark of an internally-threaded collar receive setting balls of a driver that apply a torque to the collar through the balls bearing on the walls of the troughs. At a predetermined pre-load, the balls fail the bark and plow through it to develop circumferential furrows, and the torque application on the collar ends. A second torquing with balls at a different axial position fails the bark again at the same pre-load to compensate for any relaxation after the first torque application.

Abstract: A fitting for establishing a seal between an insulated electrical cable (70) and an electrical junction box, where the junction box wall has a threaded bore and a profiled through-hole having a camming surface and shoulder. The fitting includes a threaded nut (50) and a ferrule (30) which has tines (34) extending from a ring portion. The ferrule (30) and the nut (50) are slid over the insulated cable (70) and the assembly is brought in registry with the threaded bore (8) of the junction box. Screwing the nut (50) and ferrule (30) forwardly causes the tines (34) on the ferrule (30) to contact the camming surface (12), forcing the tines (34) into the insulation (72) and the insulation (72) into the shoulder (16), thereby establishing a sealed connection. In a further improvement, the nut (50) has first and second wrench-engaging portions (100, 101) formed integrally therewith.

Abstract: A lug nut cover is provided having a breakage shroud for restricting access to the lug nut and a retaining cap for securing the shroud to the lug. The shroud includes an internal ledge having ratchet teeth thereon. The cap includes an exterior flange having pawls thereon. When the cap is threaded onto the lug, the ledge engages the flange at a predetermined position to stop forward threading. From this predetermined position, the pawl/ratchet arrangement prevents reverse threading.

Abstract: Axially-extending troughs in a bark of an internally-threaded collar receive setting balls of a driver that apply a torque to the collar through the balls bearing on the walls of the troughs. At a predetermined pre-load, the balls fail the bark and plow through it to develop circumferential furrows, and the torque application on the collar ends. A second torquing with balls at a different axial position fails the bark again at the same pre-load to compensate for any relaxation after the first torque application.

Abstract: Means and method for improving productivity and quality of grouted rock bolt installations. The invention provides means of automatically installing full length grouted bolts as well as tensioned (point anchor) grouted bolts, which ensures proper shredding of the grout package, proper mixing and proper curing of the grout, and minimizing machine time involvement. The invention also makes it possible to include a test for quality on each grouted bolt installed, within the automatic installation cycle. The invented means further allows control of the depth of holes drilled for rock bolting and automatic freeing of drill steels, where they may be danger of drill steel binding during drilling for rock bolting.

Abstract: Disclosed is a mechanically lockable fastener assembly for maintaining workpieces assembled, when an elongated bolt with threads formed along a length thereof, and substantially axially aligned rotation resisting surfaces formed along another length thereof, is mechanically assembled with a cooperating nut having a threaded portion and a compressible portion deformable into engagement with said rotation resisting surfaces of said bolt to cause the bolt and the nut of the assembly to be inseparable by untorqued unthreading.

Abstract: A threaded nozzle is adapted to be screwed into and screwed out of a threaded opening in a drill bit. The nozzle includes a front face having first and second contact surfaces which are adapted to be engaged by a manually actuable tool for screwing-in and screwing-out the nozzle. The first contact surface is inclined toward the direction of rotation in which the member is screwed-in, so that in response to the application of a force to the first contact surface for screwing-in the nozzle, a reaction force is applied against the tool for pushing the tool off the first contact surface when the nozzle has been screwed-in a predetermined extent.

Abstract: A fastener system is disclosed comprising a nut having an axial bore provided with interior thread and a bolt having exterior thread for engagement with the interior bore of the nut. The nut has an end portion having an elliptical cross section for engaging a complementarily shaped driver. As the nut is tightened onto the bolt against a workpiece, resistance to further threading increases. When sufficient resistance to threading occurs, the driver will deform the elliptically shaped end portions of the nut, forcing material of the nut radially inward toward the axis of the nut. The portion of the bolt which engages the nut has a plurality of recesses for receiving the deformed material of the nut as it flows radially inward, thereby locking the nut, bolt, and workpiece together. The recesses of the bolt have a shoulder for abutting the deformed material to prevent unthreading of the nut from the bolt.

Abstract: A fastener for the protection of vehicle wheels, including a skirt member which fits around the wheel lug nut and a retainer member which is threaded onto the exposed end of the lug and overlies a part of the skirt member. The retainer member is recessed into the skirt member and includes a socket part which strips upon tightening to prevent removal of the retainer member from the lug.

Abstract: A threaded fastener having an annular ring of yieldable friction material in the thread grooves thereof and bonded to the sides of the threads, in which the material is of substantially uniform thickness on the sides of the threads from adjacent the root to adjacent the crest thereof. In an embodiment of the invention two more adjacent but axially separated rings of friction material are provided, the annular zone or zones between adjacent rings having much less or substantially no friction material. In another embodiment, the friction material is applied primarily to the non-load bearing side of the threads in the ring.

Abstract: The improved method of making externally threaded friction fasteners which comprises directing a stream of particles of thermoplastic friction material onto the threaded surface of the fastener which has been heated to a temperature sufficient to fuse the thermoplastic particles so as to provide a deposit of substantial thickness in the thread grooves of the fastener extending completely around the fastener, in which the fasteners are advanced past a station at which the thermoplastic particles are directed at one or both sides of the threaded portion, and which comprises spinning the fasteners during application of the particles at a rate sufficient to cause the deposit of particles to extend completely around each fastener, and preferably to comprise at least two sequentially applied applications.