Abstract: A tensionable dowel for reinforcing walls and/or roofs in excavations such as mines and tunnels is described. The dowel is particularly useful in coal mines where mine walls or roofs are subject to failure. The dowel is fabricated in fibre reinforced engineering plastic and is used with a threaded nut for tensioning the dowel in the wall or roof.Also described is a process for manufacturing the dowel as well as a method for reinforcing walls and/or roofs by inserting the dowels therein.

Abstract: A fastening element to be driven into a hard receiving material, such as metal, includes a head at its trailing end and an axially extending shank projecting from the head to the leading end with a tip at the leading end. At least an axially extending section of the shank from adjacent the trailing end is threaded. A guide member is in threaded engagement with the shank and is spaced from the head when the fastening element is ready to be driven. The guide member is cup-like shaped with an opening facing toward the leading end. The guide member has a base extending transversely of the axial direction with a conically shaped section projecting radially outwardly from the base and axially toward the leading end. When the fastening element is driven into a receiving material, the guide member moves into contact with the head and is deformed when the driving of the fastening element is braked.

Abstract: An adjustable spacer (20) is located in a unison ring (16) disposed about a gas turbine engine case (18). The spacer (20) includes a pad bolt (44) having a flattened surface (52) for contacting the case (18). The pad bolt (44) is adjusted radially by a threaded cylinder (28) and adjusting nut (36). The assembly is locked in place by a locknut (54) which includes a frangible link (72) for separating a headed portion (70) from a threaded portion (68).

Abstract: A holder for an electric fuse has a first receiving body which has an internally threaded nut assembled thereto in a manner allowing relative rotation between them. The assembly of the nut to the body allows separation of the nut from the body when a predetermined axial separating force is imparted between the parts, without damage to them. A second fuse receiving body has an external thread which engages the thread of the first body. As the threaded connection is made the body sections are drawn together to enclose the fuse therein.

Abstract: An anchoring device, such as a rock anchor, includes an anchor rod with force transmission ribs projecting outwardly from its outside surface. An anchor nut is in threaded engagement with the rod and has at least an axially extending portion formed of a material having lesser strength than the material of the rod. The anchor nut has at least two axially extending portions spaced apart by cuts through the nut, which cuts extend transversely of the nuts central axis. The portions follow one another in the central axis direction with at least the portion closer to the body into which the anchor rod extends having the lesser strength. The nut portions are dimensioned so that the portion closer to the body loses its force locking engagement with the ribs on the rod and its threads shear off when a predetermined load is exceeded. The nut portions are interconnected by narrow webs remaining after the cuts are made in the nut separating the portions.

Abstract: Deformable washer, particularly for predetermining the force needed for tightening a nut mounted on a screw or a screw cooperating with a tapped hole. The washer is provided on one of its faces, preferably the face which is meant to rest against one of the parts to be tightened, with a circular spot face, concentric to the central hole, the external diameter of which spot face is notably greater than the diameter of the central hole, while its depth is preferably near to the width of the spot faced ring. The washer further comprises, on its edge, a visible groove of which the cylindrical base is also concentric to the central hole and has a diameter at the most equal to the external diameter of the circular spot face and preferably just under said external diameter, the thickness of said groove being also as near as possible to the depth of the spot face.

Abstract: A three-piece fastener includes a bolt with a shank having a concentric opening in its threaded end, a nut adapted to fit over the threaded end of the bolt, and a wedge member which is insertable into the end opening of the bolt for expanding and thereby securing it. The threaded end of the bolt is axially slotted to facilitate its expansion.The outer diameter of the wedge member is smaller than the outer diameter of the threaded end of the bolt. When the bolt is to be inserted into an opening of a structure in order to accomplish a fastening action, the wedge member is first loosely inserted into the end opening of the bolt. Then when the bolt and wedge are passed through the opening, the nut is applied to the end of the bolt and is tightened. Thereafter, the wedge is tightened in order to expand the end of the bolt.The end opening of the bolt has interior threads, and is threadedly engaged by the wedge member, but in an opposite rotational sense to that in which the nut is applied to the bolt.

Abstract: An elongated break-away rivet includes a main body and a tapered extension joined along a break-away plane. The elongated rivet minimizes rivet tumble along a delivery path which terminates at a work piece. At the end of the path, a tool impacts against the extension thereby causing it to break away and leaving a finished rivet of length appropriate for the work piece.

Abstract: There is disclosed a torque limiting fastener system for forged or pressed metal nuts. The stamped metal fasteners have a central, cylindrical sleeve, an annular ledge which is dependent from one end of the sleeve, and a surrounding skirt, generally with hexagonal flats, which forms an annular well about the cylindrical sleeve. The torque limiting characteristic is imparted to these fasteners by a drive member which is of approximately the same dimensions as the stamped or pressed metal fastener and which has a plurality of prongs which are received in apertures or recesses in the stamped fastener. The apertures can open into the annular well about the central sleeve of the fastener or can be placed in an annular flat base which is formed on some of the stamped metal fasteners. The drive member is formed of a suitable plastic material having a precisely controlled shear strength.

Abstract: Quickly attachable button arrangement (1) comprising a button head (2) having integrally formed therewith a combined button-head holding and attachment device (5) for holding the button head on and attaching the button head to a piece of material (3). The button-head holding part (5a) comprises one or more surfaces (4a, 4b, 4c) or the like which are located at a distance from the button head and face theretowards, and the button-head attachment part (5b) comprises a material-piercing needle-like part. The holding part (5a) is intended to abut the side (3a) of the material (3) located on the opposite side of the button head (2), therewith to hold the button head to the other side (3b) of the material. The holding part (5a) has a helical and/or spiral form and the holding part (5a) is intended to follow the attachment part (5b) through the material as the button arrangement is twisted.

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 security fastener has a threaded body with tool engaging surfaces. It is surrounded by a freely rotatable spinner. When the fastener is tightened down the tool engaging surfaces are removed so there is nothing on the fastener to be engaged by a tool. The side of the fastener is shielded by the rotatable spinner.

Abstract: A structure for connecting a plug or like spigot member to an internally threaded socket portion of a device by screwing a male screw projecting from the spigot member into the socket portion. When the spigot member is tightened up, a flange of metal formed on the shank of the screw integrally therewith over the entire circumference of the shank is cut off and clamped between the socket portion and the spigot member to provide a gas- or air-tight connection permitting no leakage.

Abstract: A double nut comprising a locking nut body having a threaded axial bore, the locking nut body being formed with a recess defined by an annular internal surface and arranged in communication with the axial bore, a tightening nut body having a threaded axial bore coaxial with and corresponding in diameter to the axial bore of the locking nut body, the tightening nut body being formed with an annular axial projection insertable into the recess and having an external surface, at least one of the internal and external surfaces being conical with a diameter decreasing gradually in a direction of insertion of the axial projection into the recess, one of the recess and the axial projection being eccentric with both of the axial bores, and a connecting web adapted to break at a predetermined circumferential shearing force and extending radially to connect the external surface to the internal surface.

Abstract: An adhesive anchor comprises a tie rod 1 having a thread casing 3, a pressure nut 5 and a pressure plate 7. The thread casing is saw tooth shaped with steep flanks 33 facing the tie rod free end and flat flanks 31 facing away from it. The turns of the thread casing are wedged between the thread body 11 of the nut and the tie rod, considerably improving the transfer of forces between the casing and the rod. The anchor is especially suitable for the securing of gallery walls in coal mines.

Abstract: A prefastenable torque-shear bolt has a bolt cut with a thread adapted to engage a nut, and full-fastening and prefastening grips each having wrench-engaging surfaces. One end of the bolt continues to a first transition portion that is tapered like a truncated cone. The full-fastening grip extends from the first transition portion and a full-fastening break-off groove. One end of the full-fastening grip continues to a second transition portion tapered like a truncated cone. The prefastening grip extends from the second transition portion and a prefastening break-off groove. The effective area of the fracture surface of the prefastening break-off groove is smaller than that of the full-fastening break-off groove. A first burr that arises on the threaded portion side when the full-fastening break-off groove is formed by rolling is formed on the first transition portion, and the outside diameter of the first burr is smaller than the diameter of the thread bottom in the threaded portion.

Abstract: A bolt adapted for use in automated manufacturing line such as automotive vehicle assembly line, can be tightened from one side with a mechanical wrench (16). The bolt has a threaded portion (16) engageable with a nut (18), a pin-tail (18) gripped by the mechanical wrench, and a guide section between the threaded portion and the pin-tail. The guide section has a length (l) determined in relation to the thickness (L) of the nut. The length of the guide section is selected so that approximately the entire length of the pin-tail can protrude from the nut when the nut is preliminarily attached to the bolt with about one turn of rotation.

Abstract: A limited torque bolt-nut assembly including a bolt shank having a threaded first end portion and a non-threaded second end portion, a secondary drive head on the second shank portion and a primary shearable drive head on the secondary drive head, and a hollow nut secured over both drive heads and a portion of the non-threaded shank section. The hollow nut drives the primary drive head which rotates relative to the secondary drive head until the primary drive head shears off at a predetermined torque releasing the nut and primary drive head. The secondary drive head remains on the bolt shank for adjustment and removal of the bolt.

Abstract: An apparatus and method for anchoring a bolt in a bore hole in a rock formation is disclosed. A tensioning assembly, which comprises a tensioning plug and expandable sheath, is threadedly engaged to the end of an elongated bolt. A ring is securely affixed to the inner wall of the plug at a predetermined point adjacent the plug's threaded portion. The end of the bolt abuts the ring upon assembly, thereby causing the bolt and the tensioning assembly to rotate together upon application of a torque to the bolt. This rotational movement effects mixing of bonding material which is placed in the bore hole ahead of the tensioning assembly. As the mixed bonding material begins to harden, rotation of the tensioning assembly is resisted.

Abstract: An electrical bushing includes a replaceable stud which connects the electrical bushing which is mounted on the housing for an electrial distribution unit to electrical equipment located outside the housing. The replaceable stud includes a first stud shank connectable to a conductor within the body of the electrical bushing and which is stronger than a second stud shank connectable to the electrical equipment located outside the housing. The replaceable stud, if damaged, can be removed from the bushing body without otherwise disturbing the bushing body or any connections between the electrical bushing and equipment positioned inside the housing.

Abstract: An apparatus and method for anchoring a bolt in a rock formation is disclosed, and includes a rebar assembly adapted for use in a bore hole and an elongated bolt threadedly engaged to the end of the rebar. A threadable sleeve is securely affixed in an orifice, forged in the end of the rebar, at a predetermined point adjacent the orifice threaded portion. The end of the bolt abuts the sleeve upon assembly, thereby causing the bolt and the rebar assembly to rotate together upon application of a torque to the bolt. This rotational movement effects mixing of bonding material which is placed in the bore hole ahead of the rebar assembly. As the mixed bonding material begins to harden, rotation of the rebar assembly is resisted. Upon application to the bolt of a torque in excess of a predetermined torque, the bolt will thread the sleeve located in the rebar orifice by cutting threads therein, thereby causing relative rotational movement between the rebar and the bolt.

Abstract: The invention relates to a bolt comprising a screw the threaded portion of which is provided with a guiding end, and a nut whose upper portion contains a self-locking washer with which is separably associated a ring internally concentric with the washer and ensuring the centering of the screw during its introduction into the nut.

Abstract: A fluid dispensing nozzle has a retainer secured onto its peripheral surface of the nozzle's discharge spout. This retainer extends radially outward from the spout and is designed to engage a radially inwardly extending lip about a fill tank opening to secure the spout in the fill tank opening when the nozzle is operated in an automatic mode. The retainer is secured onto the spout by an annular groove in the spout and a retainer ring fitted in the groove. The retainer is abutted against the retainer ring and means are provided to prevent axial movement of the retainer relative to the spout once the retainer is so abutted.

Abstract: A screw member having a plurality of heads by providing one or more thin neck portions to be sheared at a predetermined torque, in which a collar having a skirt portion with its one part being cut away is fitted on the thin neck portion from the lateral side to expose the outer head part alone and to engage the cap member fitted from the side of the bearing surface of the inner head part of the screw member, and the cap member is inserted between the skirt of the collar and the inner head part to thereby prevent the collar from slipping out.

Abstract: A screw member having a plurality of heads by providing one or more thin neck portions between them to be sheared at a predetermined torque, wherein a cap member surrounding the outer periphery of an inner head part from the side of its bearing surface is engaged with the inner head part so as not to displace outwardly slipping out of it, and the inner peripheral surface of the cap member is made conformable to a shape of the outer peripheral surface of a socket of a screw driving tool to be fitted on the inner head part.

Abstract: A torque limiting set screw is disclosed with a driving head at one end and a seating head at the other end. The driving head is connected with a threaded shank by a torque control neck. The seating head comprises a disk having a seating surface with a point extending from the surface for indentation into a member to be retained. The seating surface is of larger area than the cross-sectional area of the shank and is adapted to seat against the member after the point is fully indented. The large area surface engagement by the seating head distributes the force of the set screw on the member and prevents damage to the member.

Abstract: The anchor bolt assembly is of the type used in mine roofs where the anchor bolt is assembled and positioned in a drill hole in a rock formation and in which quick-setting adhesives secure the assembly to the rock formation. The assembly includes an elongated reinforcing rod, an elongated bolt, and a coupling internally threaded at each end and connected to the rod and bolt. A cylindrical plug of aluminum is positioned within the bore of the coupling and frictionally engaged by the threads so as to permit the entire assembly to turn in a first position and to disengage from its frictional engagement to permit turning of only the elongated bolt in a second position.

Abstract: A break bollard provided with a central post which is attached to a base plate which in its turn is secured to a stationary support construction by means of a screwed bolt construction with weakened region of incipient fracture, which is positioned between the screwed bolt head portion and a portion lying therebehind and arranged for engagement in rotary sense in case of fracture, thus ensuring, after fracture, an easy and rapid restoration to the original state.

Abstract: The present invention comprises a lug nut which has two separable portions connected by a frangible neck, wherein a first portion engages the threads of the stud, and a second portion provides a surface adapted to engage a wrench so that the lug nut may be driven into the stud. When the stud-engaging first portion has been threaded onto the stud and sufficiently tightened, continued application of torque cause the frangible, wrench-engaging second portion to shear off from the stud-engaging first portion. The stud engaging portion has an annular notch which is adapted to engage a snap ring located in the wrench-engaging portion. After the wrench-engaging portion is severed from the stud-engaging portion, the wrench-engaging portion is then reversed and positioned onto the stud-engaging portion. When so positioned, the snap ring engages the notch, which rotatably secures the wrench-engaging portion to the stud engaging portion.

Abstract: A hydrocarbon loading buoy has a connection element rotatable in a bearing supported by the buoy. When a riser pipe or conduit is connected to the connection element the pipe and element can rotate or swivel relative to the buoy. A lock mechanism on the buoy is operable to lock the connection element to the buoy so that the connection element is supported independently of the bearing. With the connection element locked the bearing can be serviced, or removed, while the buoy is in operation. In a preferred form, the lock mechanism includes wedges which move radially and engage a sloping surface of the connection element to move it axially into clamping engagement with the buoy.

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: A mine roof bolt assembly including a shank having anchoring means at one end for securing the shank in the back of the bore, the opposite end of the shank being threaded. A bolt head having a central bore, includes a first threaded bore portion threadedly engaged with the threaded end of the shank. A stop plug is threaded into a second threaded bore portion in the bolt head and abuts an end of the shank to initially limit penetration of the shank into the bore of the head. The bolt head is rotated by rotational means having a predetermined torque limit, moving the head longitudinally with respect to the shank, exerting a force on the stop plug which strips the threads from the second threaded bore portion, thereby permitting uninterrupted passage of the shank through the bore. A roof plate positioned on the shank between the bolt head and roof is then forced upwardly by the head into supporting engagement with the mine roof, and the predetermined torque of the rotational means is established.

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 lug nut attachment is provided for detecting the removal of a wheel lug nut, a device that serves as a tire security cap. The cap comprises a breakable shroud and means for mounting the cap to one lug nut of a wheel. When mounted thereto the cap encloses the lug nut and prevents access thereto until the shroud is broken.