Abstract: The invention relates to an insert for connecting an electrical connector to a wall (9) and to a corresponding method. The insert comprises an electrically conductive bolt (1) having a head (3), which extends along a first longitudinal axis (I), and a shaft (4), which is provided with at least one connecting means (5), and a ring (2), which has a through-opening (7) and extends along a second longitudinal axis (II). The head (3) comprises an outer contour which, at least in regions, is produced by the rotation about the first longitudinal axis (I) of a first line (L1), which is curved with a first radius (R1) and spaced apart from the first longitudinal axis (1). The through-opening (7) comprises an inner contour which, at least in regions, is produced by the rotation about the second longitudinal axis (II) of a second line (L2), which is curved with a second radius (R2) and spaced apart from the second longitudinal axis (II).

Abstract: A method for establishing a connection, with the following steps: inserting a sleeve (12) having a stop flange (10) into a bore (14), in such a way that the stop flange (10) is at a distance from a bore edge (16); anchoring at least one elevation (18) of a free end portion (20) of the sleeve (12) in the bore wall (22) by widening the free end portion (20) of the sleeve (12); and moving the stop flange (10) in the direction of the at least one fixed anchored elevation (18) of the free end portion (20) of the sleeve (12), by widening a further portion (24) of the sleeve.

Abstract: A fastener assembly includes a bolt having a shaft and a head. The shaft has proximal and distal shaft ends and a shaft body, with the head at the proximal shaft end. At least a bondable portion of the shaft body is at least partially made of a bondable material. At least one collar has proximal and distal collar ends longitudinally separated by a collar body which includes a longitudinally oriented collar aperture extending through a thickness thereof between proximal and distal collar surfaces. The collar aperture defines an inner collar wall having a bondable portion which is at least partially made of a bondable material. At least the bondable portion of the shaft body is located inside the collar aperture. The bondable material of both of the inner collar wall and the shaft body is activated to bond the shaft and the collar into an integral fastener assembly structure.

Abstract: A fastener including a body having a threaded portion and an opposing, tapered portion, where the tapered portion includes an outwardly angled surface, and a sleeve movably connected to the body. The sleeve includes a plurality of fingers at least partially separated from each other, where each of the fingers includes at least two, axially spaced gripping members protruding from the body. When the fastener is inserted in a borehole formed in a substrate and a fastening member is threaded onto the threaded portion and tightened, the sleeve progressively moves along the angled surface causing the fingers to move outwardly and at least one of the gripping members to engage an inner surface of the substrate forming the borehole to secure the fastener in the borehole.

Abstract: A wrench quick release apparatus includes a sleeve, a positioning unit, a wrench unit and an elasticity unit. The sleeve includes a channel and an engaging section for engaging to a first plate. The positioning unit inserts in the channel of the sleeve, and includes one end inserted through the first plate and an opposite end protrudes out from the channel of the sleeve. The wrench unit is pivotally connected to the positioning unit and protrudes out from one end of the sleeve. The elasticity unit includes one end pushed against the positioning unit and an opposite end pushed against the sleeve. Accordingly, the wrench quick release apparatus is first engaged to the first plate through the sleeve and then engaged to or disengaged from a second plate.

Abstract: A fixing mechanism includes a shaft, a constraining member, a sleeve member, a resilient bushing, a pivot member and a handle. The constraining member is connected to an end portion of the shaft. The sleeve member sheathes the shaft. The resilient bushing sheathes the shaft and is disposed between the constraining member and the sleeve member. The pivot member is connected to the other end portion of the shaft. The handle is pivoted to the pivot member and abuts against the sleeve member. The handle pushes the sleeve member and drives the pivot member to activate the shaft to pull the constraining member when the handle pivots relative to the pivot member, so that the constraining member and the sleeve member cooperatively compress the resilient bushing, so as to make the resilient bushing generate a radial deformation.

Abstract: A fastener for installation in a workpiece, the fastener comprising a pin and a body comprising a shell and a radially enlarged head, wherein a first engaging means comprising a nylon sleeve is located within a bore of the shell, and a second engaging means comprising a plurality of barbs is located on the exterior of at least part of the pin shank, and wherein the pin shank is insertable into the bore of the body from an end of the body remote from the head end, such that the first and second engaging means mutually engage.

Abstract: A method of compacting and stabilizing bone in the spine using an expandable screw and bone filler. The method includes placing an expanding screw through a pedicle and into a fractured vertebral body using established techniques; and expanding the screw within the body to create a cavity by tamping bone around the expanded aspect of the screw. The screw can be expanded and rotated about its rotational-axis to tamp bone adjacent to the expanded screw. After compaction, the screw is removed and the cavity is filled with bone filler.

Abstract: A rivet stud has a rivet body with an elongated shank, a flange, and an axial bore in which is located a tension mandrel, which has a mandrel shank with a drawing end projecting out of a head end of the rivet body that is separable from the mandrel shank at a predetermined breaking point and which has a mandrel head that is supported on a foot end of the rivet body. The mandrel shank is provided with locking means that secure it in the rivet body after setting of the rivet stud, and the predetermined breaking point is located such that the breaking point lies inside the bore of the rivet body after setting of the rivet stud. Located on the mandrel head is a mounting stud that projects from the mandrel head on the side opposite the mandrel shank.

Abstract: The blind rivet assembly for fastening components having a mounting hole comprises a rivet body and a mandrel. The body has a hollow sleeve with a flange at one end. The mandrel has a stem having a diameter smaller than the inner diameter of the sleeve and a length greater than the sleeve, and a head whose diameter is greater than the inner diameter of the sleeve. A beveled face is formed in the end portion of the through hole in the sleeve. When the stem of the mandrel is pulled to fasten the mounted components, the head expands the end portion of the sleeve is pushed by the head to expand the diameter, the head is pulled through the rivet body without breaking off from the mandrel stem, and the mounted components are fastened between the flange of the rivet body and the expanded end portion of the sleeve.

Abstract: A blind fastener comprising a body (22) and a stem (26), wherein the fastener is installed in a workpiece by applying a pulling force to the bodycausing a bulb to form at a radially expandable section of the body, the stem of the fastener comprising two waisted regions (38, 40) of reduced diameter, such that when the body of the fastener is crimped after assembly with the stem, the body is caused to form a barrel shape, whereby clearance between the body and stem is minimised

Abstract: A self-piercing blind fastener comprising a mandrel having an elongate cylindrical shell mounted on a stem of such mandrel and which extends co-axially about a central elongate axis of the blind fastener, the shell having a radially extending flange at one end and a tail-end portion at the opposite end for insertion through a workpiece, the mandrel further having a mandrel head in operative engagement with the tail-end of the fastener for transmitting a setting force thereto during setting of such fastener, the blind fastener further comprising a longitudinally extending indenting member extending co-axial with and away from the tail-end of the blind fastener, which indenting member having a cross sectional area less than the cross sectional area of the shell.

Abstract: A blind rivet and a method of assembly comprising a tubular shell and mandrel in combination. The mandrel comprises a stem and a radially-enlarged head which in use forms a blind head to the shell to set the rivet, in which either the head of the mandrel or the bore of the shell is formed with a plurality of depressions the bases of which lie on a notional circle having a diameter which, where the depressions are formed in the head of the mandrel, is less than the bore of the shell or, where the depressions are formed in the bore of the shell, is greater than the diameter of the head of the mandrel. The depressions, which are preferably generally longitudinally disposed, define ribs, ridges or other protusions therebetween which in use and on pulling the mandrel into the shell bore extend radially beyond the bore of the shell, so that material of the shell becomes displaced by contact with the ridges and occupies the depressions. The invention may be applied either to pull-through, or self-plugging rivets.

Abstract: A system for mine roof reinforcement includes a bearing plate and a tubular member with an inner surface, an outer surface, first and second free ends, and an enlarged portion disposed proximate one of the free ends. The system also includes a projectile and an insertion member for being received in the tubular member. In addition, a method for inserting a bolt in rock includes: forming a borehole in rock; placing a bearing plate with an opening therein against the rock so that the opening is aligned with the borehole; disposing a tubular member in the borehole and opening so that an enlarged end of the tubular member abuts the plate; and mechanically expanding the tubular member so that an outer wall thereof frictionally engages the rock.

Abstract: According to an embodiment of the present invention, a fastening assembly has a first component containing a first aperture and a second component containing a second aperture. A pin made of a super-elastic alloy defines a shank with a bore having an axis, the shank being at least partially constrained within and juxtaposed with both the first and second apertures. Activation of the super-elastic alloy generates a retaining force normal to the axis of the pin, fastening the components together. Several embodiments are shown where a unitary pin fastens the components, while other embodiments are shown where the super-elastic properties of the pin are activated by another independent element of the fastener, for example a retainer that co-acts with the pin to fasten the components together. Activation forces can be applied to the pin through relative motion, or stretching against a shoulder.

Abstract: A two piece blind fastener for securing a plurality of workpieces including a hollow sleeve having an enlarged sleeve head at one end and a pin having an enlarged shear ring at the end opposite the sleeve head followed by an elongated retention portion of reduced diameter. The shear ring is adapted to engage and move inside the sleeve to form a tuliped shaped blind head in response to a relative axial force applied between the pin and sleeve and to shear off proximate to the inner or blind sheet line of the workpieces. The retention portion is then moved with the pin shank into the shear ring and with the shear ring finally located at a position on the retention portion depending upon the overall thickness of the workpieces. This provides a clamp and lock section between the pin and sleeve at the inner or blind side of the workpieces. The pin and sleeve have a lock structure actuated after final formation of the clamp and lock section to provide a lock between the pin and sleeve.

Abstract: A blind fastener which can be installed by access to one side only of a workpiece comprises a pin, a sleeve, and an abutment member. The pin extends inside the sleeve and engages the sleeve at one end. The other end of the sleeve has a radially enlarged head. The sleeve is of one piece and has a radially expandable portion. The abutment member is adjacent to the sleeve head and abuts a frangible element of the sleeve head. The sleeve is inserted into an aperture in a workpiece with the expandable portion protruding beyond the blind face of the workpiece and the head abutting the near face of the workpiece. A pulling force is applied to the part of the pin extending beyond the abutment member and the expandable part of the sleeve expands radially to form a blind head against the blind face of the workpiece.

Abstract: Disclosed is a self plugging blind rivet for securing together apertured members, the rivet comprising a tubular shell having a tail end face at one end and a preformed radially enlarged bead at the other end, and a stem that extends through the shell and has a stem head adjacent the tail end face of the shell and a breakneck located away from the stem head, in which the region of the stem shank on the stem head side of the breakneck has a plurality of depressions formed therein extending to the breakneck, the corresponding region of the shell substantially filling the depressions in a region adjacent the stem head and progressively less towards the breakneck whereby, in use and under axial compression loading of the shell, the shell preferentially buckles in the region adjacent the member remote from the preformed head to form a blind head in contact with the member so as to clamp together the apertured members.

Abstract: A blind rivet having a mandrel with a predetermined breakable stem (4) disposed within a body with a bored (18) shank (14). A radial flange (16) is formed on one end of the shank and the other end (20) of the shank is engaged with the enlarged head (2) up the stem the diameter of which is substantially equal to that of the shank. The mandrel below the enlarged head has a plurality of indentations (8) formed on the stem to define a square of reduced cross-sectional area. The shank has an enlarged internal cross-sectional area (22) to substantially engage the indentations of the stem below and adjacent to the enlarged head of the stem.

Abstract: A peel type blind rivet (1) has a rivet body (2) composed of a cylindrical part (3) and a flange-shaped head (4) formed integral with one end of the part, and a mandrel (5) composed of a body (6) for insertion in the part and an enlarged head (7) formed at one end of the body. Radial blades (9) are formed integral with a lower surface (8) of the mandrel head such that the other open end (14) of part (3) will be cut into radially protruding split feet (14a) when the mandrel body (4) is pulled back. The mandrel head (7) is of a maximum diameter (D) greater than an outer diameter (d) of the cylindrical part (3). The lower surface (8) increases its diameter gradually and upwards from the mandrel body (6) towards a rim (7a) of the mandrel head having the maximum diameter. Each blade (9) is of a V shape protruding downwards from the lower surface such that a cutting edge (10) of each blade extends upwards and obliquely from the mandrel body towards the rim.

Abstract: A clamping joint and a method for producing such a joint for interconnection of a clamping lock with at least one wire, which is insertable therein, and which clamping lock after compression during plastic deformation in a clamping tool seizes and arrests the wire in the sleeve. A least one locking member is embedded in the wire and connected to the lock, under clamping of the wire against the clamping lock.

Abstract: A self-plugging blind rivet for securing together apertured members comprises a tubular shell (11) having a tail end fact (16) at one end, a pre-formed radially enlarged head (13) at the other end, and a stem which extends through the shell and has a stem head (22) adjacent the tail end fact (16) of the shell. The region adjacent the stem head (22) is of increased diameter relative to the rest of the stem shank and has a plurality of axial depressions (26) formed therein, the corresponding region of the shell being arranged to fill the axial depressions (16) in the stem and being harder than the material of the shell (11) in a region adjacent the radially enlarged head (13). In use and under axial compression leading of the shell (11), the shell (11) buckles in the region adjacent the member remote from the performed head to form a blind head in contact with said member so as to clamp together the apertured members.

Abstract: A tool-less fastener for use in connecting a computer cable to either a computer or peripheral equipment. An elongated rod with an external expandable sleeve fits into a standard threaded hole and then expanded to fasten the cable to the equipment without the need for a screwdriver or other tool. The tool-less fastener may be independent of or interconnected to the computer cable.

Abstract: The present invention relates to a process for riveting materials by means of a blind rivet and corresponding blind rivets. The process of the invention in particular carries out the step of stretching the body of the sleeve (31) before blocking it from one part to another of an assemblage (13, 14) between an abutment head (50) and a blocking head (51). The extending of the body of the sleeve is especially permitted by the cooperation of a stop means (44) with a shoulder (36a) of the shank of the mandrel (32), and by the pulling exerted on the mandrel. The present invention also relates to blind rivets adapted to be set by the process of the invention.

Abstract: An improved method of blind riveting and an improved blind rivet have been described. The blind rivet of the present invention includes an interference fit shank portion which ensures adequate hole-fill and produces work hardening in a work piece. The blind rivet of the present invention also produces a drawing effect, reducing the force necessary to securely seat the rivet in a hole.

Abstract: A pin for a two piece type fastener includes a flexible member attached to a free end of the pin. The flexible member has a diameter slightly larger than a bore in a workpiece through which it is inserted so that the pin is retained in the bore after insertion. The flexible member also cleans debris from the bore as the pin is installed in the bore, thereby reducing the possibility of the debris from fouling the grooves in the pin.

Abstract: To produce a blind-rivet connection in which the rivet shaft (7) breaks off flush with the set-head (4) of the blind rivet (1), regardless of the total thickness (G) of the components (21) to be riveted, a blind rivet (1) is proposed whose rivet shaft (7) is provided with a plurality of break-off grooves (13) arranged axially in series. The tension segment (12) of the rivet shaft (7) is always separated at the break-off groove (13a) that is flush with the set-head end (11) after the rivet shank (2) has buckled to form a closing head (27).

Abstract: A sealing fastener, such as a sealing rivet, is disclosed for sealing engagement with a workpiece. The sealing fastener has a head and a shank extending from a lower surface of the head. An aperture passes through the head and shank, and a mandrel and collar fit within the aperture. A sealing member, such as an O-ring is disposed between the collar and the mandrel. The head of the sealing fastener may also have a groove formed therein and may have a sealing member disposed at least in part in the groove. In use, the rivet is placed through an opening in the workpiece, and a lower portion of the shank is collapsed so to form a lower head and so that the upper and lower heads engage the workpiece. The sealing member is compressed between the collar and a wall of the aperture, and the collar and mandrel are placed in locking engagement to maintain the sealing member in a compressed state.

Abstract: A blind fastener has an assembly including an inner sleeve, an outer sleeve and a pin member and is adapted to be located in workpiece openings with the pin member having an expansion portion adapted to be pulled through the inner sleeve radially expanding both the inner and outer sleeves to provide an interference fit with the workpiece openings.

Abstract: An improved blind rivet assembly is disclosed, in which a plastics cylinder is moulded along a pulling stem of a long break mandrel. On setting the mandrel is broken within the cylinder providing the cylinder with an additional degree of shear strength, allowing the cylinder to be used as a support.

Abstract: An adhesive bonded nutplate assembly is provided for mounting onto a substrate, particularly such as a composite substrate having an opening therein for passage of a fastener such as a bolt or screw. The nutplate assembly includes an integral liner sleeve to project through the substrate opening when the nutplate assembly is mounted thereon. An installation tool includes a tapered nose in combination with a pulling mandrel to pull and separate a fixture pin from the nutplate assembly while flaring a leading edge of the liner sleeve to lock the nutplate assembly in place.

Abstract: A temporary fastener that fastens two adjacent workpieces. The fastener includes a shank that extends through a hole of the workpieces. Extending from one end of the shank is a conical shaped head. The fastener also contains a pull stem which has a head located adjacent to the blind end of the shank. The stem head is pulled through the shank to expand and tightly fasten the shank to the workpieces. The fastener is removed by drilling through the head and the shank. The diameter of the conical shank head is smaller than the diameter of the drill so that part of the head does not become attached to the drill bit and scratch the workpiece. The conical shape of the head also reduces the volume of fastener material to further reduce the size and amount of chips produced during the drilling process. The tightly engaged shank prevents the fastener from rotating during the drilling operation.

Abstract: The present invention relates to a process for riveting materials by means of a blind rivet and corresponding blind rivets. The process of the invention in particular carries out the step of stretching the body of the sleeve (31) before blocking it from one part to another of an assemblage (13, 14) between an abutment head (50) and a blocking head (51). The extending of the body of the sleeve is especially permitted by the cooperation of a stop means (44) with a shoulder (36a) of the shank of the mandrel (32), and by the pulling exerted on the mandrel. The present invention also relates to blind rivets adapted to be set by the process of the invention.

Abstract: A fastener including a sleeve, a stem extending through the sleeve, an integral shear ring adjacent a tail end of the sleeve, and an expander ring between the shear ring and the sleeve tail to facilitate bulbing of the sleeve tail.

Abstract: A push type fastener for fastening a movable structural part (41) to a fixed structural part (43), wherein the coupling and decoupling actions are both a push type operation, the fastener consisting of a plunger (12) having a shank (20) with a plunger head (18) at one end and a threaded end portion (26a) at the other end, an expandable grommet (14) adapted to receive the plunger shank (20) therethrough, and an attachable head (16) which is securable to the threaded end of the plunger shank (20). The fastener (10) requires each structural part (41, 43) to be provided with an aperture (45, 46) and the attachable head (16) to be smaller than the aperture (46) in the second structural part.

Abstract: A removable rivet which includes a shank and a preformed head located at at least one end of the shank, the shank being insertable through workpieces and being capable of being permanently deformed to rivet the workpieces together. The rivet includes an annular groove at the junction of the shank and the head, the annular groove extending radially inwardly of the diameter of the shank, thereby to facilitate separation of the head from the shank when a drill of diameter substantially equal to that of the shank is applied to the head of an installed rivet co-axially with the shank until the drill meets the annular groove; an annular rim carried by the head of the rivet for cooperating with a drill, thereby to locate the drill co-axially with the annular groove; and abutment faces carried by the head of the rivet for engaging dogs of a non-rotating sleeve of the drilling apparatus thereby to prevent rotation of the rivet under the influence of the rotating drill.

Abstract: A rivet type fastening device having a hollow rivet body, a pull shank slideably disposed within said hollow rivet body and including an enlarged mandrel head at one end. The opposing end of the pull shank is connected to a pivotally mounted actuator movably mounted between two positions for moving said mandrel head between condition with said rivet body or an unset condition extending outside said rivet body.

Abstract: A blind rivet includes a tubular shell formed with an enlarged head and a shank, and a mandrel formed with a stem and an enlarged head. The shell and mandrel are insertable from one side of a plurality of members to be fastened together through aligned openings such that a pull force applied to the mandrel from that side causes the shell shank to bulge outwardly, and thereby to securely fasten the members between the shell head and the bulged portion of the shell shank. The mandrel includes two gripping portions axially spaced from the mandrel head and each other by bridging portions of smaller diameter than the gripping portions such that the shank is firmly gripped by the outer surfaces of the two gripping portions when the mandrel is pulled to outwardly bulge the shell shank.

Abstract: A blind rivet includes a mandrel shaft having a head disposed at one axial end. A hollow rivet shell has a cylindrical shape including an inner cylindrical surface and an outer cylindrical surface. The rivet shell surrounds the mandrel shaft. The outer cylindrical surface has at least one attenuation groove, which includes at least two recesses. Each recess has a bottom surface that substantially forms a secant with respect to the outer cylindrical surface. A method of manufacturing a blind rivet comprises the steps of placing a mandrel shaft having a head within a hollow rivet shell, producing at least one attenuation groove in an outer cylindrical surface of the rivet shell after the placing step so that at least two recesses are formed. Each of the recesses has a bottom surface that substantially forms a secant with respect to the outer cylindrical surface.

Abstract: A blind fastener which comprises a fastener body, a stem and a two-piece shear/expander assembly. The assembly includes an anchor section sized to fit within an annular groove in a neck portion of the stem and an expander collar which surrounds the shear ring. When the fastener is installed, a bulbing portion of the expander collar upsets the tail end of the fastener until an inner shoulder of the collar step causes an outer section of the ring to shear from the anchor section. A lock ring groove is formed in the stem midsection of smaller diameter at the intersections of the stem neck and midsection. The shear ring may be formed of shaped wire which is wrapped around the fastener stem, while the expander collar is an annular element next to the shear ring. The shear ring dimensions and material properties can be modified to alter the fastener characteristics.

Abstract: A blind fastener designed to secure workpieces having aligned holes therein is provided. The fastener comprises an elongated stem having a head at one end and a serrated tail at the other, and a tubular sleeve having a head through which tail of the stem extends and a tail which is engaged by the head of the stem. The stem further includes a shear ring for bulbing the sleeve tail and a lock ring groove for receiving a lock ring for locking the stem to the sleeve. The stem also has a shoulder which engages shoulder portion in the sleeve to cause the sleeve to expand radially outward so as to fill any clearance or gap between the sleeve and the workpieces. A reservoir located in the stem accepts excess shoulder material displaced during the hole filling process. In one embodiment, a preformed lock ring is positioned in the lock ring groove to lock the stem to the sleeve. In another embodiment, a lock ring is formed from material in the sleeve head.

Abstract: A self-plugging blind fastener suitable for fastening apertured sheets together, and of the type comprising a body having a shank, headed at one end, and an axial bore in which is disposed an elongate stem which, in use, is pulled to expand the shank and lock part of the stem in the body, has an improvement for locking the stem in the body. The head end of the bore is of reduced diameter and presents a stop-shoulder. The stop-shoulder is an annular skirt partly separated from surrounding material by an annular cleavage, and presents a planar stop-face facing away from the head-end. The stem comprises a plug which is connected by a breakneck to a stem-tail for pulling the plug into the bore of the body. The plug has an annular locking recess spaced from the breakneck, and is radially enlarged on the side of the locking recess remote from the breakneck to provide a plug-shoulder and shank-enlarging means.

Abstract: A fastener mandrel has formed on one end a shoulder and a twisted, generally rectangular shaped head adjoining the shoulder. In setting the fastener in a workpiece, the shoulder enlarges the end of a tubular rivet and clamps workpieces together in combination with a preformed head on the other end of the rivet. The mandrel head deforms the rivet tail into a twisted appearing shape with a somewhat elliptical cross-section that partially encloses the mandrel head to provide good stem retention and prevent axial looseness. A plurality of axial ribs on the mandrel stem are drawn into a reduced diameter section of the rivet head end when the rivet is set, thereby providing additional stem retention and torsional interference.

Abstract: A blind fastener designed to secure workpieces having aligned holes therein is provided. The fastener comprises an elongated stem having a head at one end and a serrated tail at the other, and a tubular sleeve having a head through which tail of the stem extends and a tail which is engaged by the head of the stem. The stem further includes a shear ring for bulbing the sleeve tail and a lock ring for locking the stem to the sleeve. The stem also has a neck which engages a reduced diameter shoulder portion in the sleeve. Interference between the neck and the shoulder causes the sleeve to expand radially outward so as to fill any clearance or gap between the sleeve and the workpieces. A reservoir located in the stem accepts excess shoulder material sheared off during the hole filling process, the excess material also serving to form a secondary lock.

Abstract: A self-plugging blind rivet, of the kind comprising a tubular body having a head and a shank which is deformed by means of a headed stem which is disposed in the body and pulled so as to form a blind head and, if necessary, to cause the shank to bulb so as to grip workpieces of lesser thickness than the maximum for which the rivet is designed, is so shaped and dimensioned as to avoid the need for a crimping or hardening operation to be performed on the shank. Thus the shank is made of uniform hardness, and has a waist and a tail portion, the waist being of reduced external diameter compared with the tail portion, and the tail portion having a length B and an external diameter D which are related to satisfy the expressionB=mD+nwhereinB is the length in millimeters, of the tail portion;D is the external diameter, in millimeters, of the tail portion;n is a length, in millimeters, of from 2.15 to 2.73 millimeters, andm is a number from 0.373 to 0.527 inclusive.

Abstract: Detachable device for joining together objects having holes intended to come into alignment, comprising:a tubular member made of an elastically deformable material and capable of passing through the holes when it is in the expanded state and of widening in order to be locked in the holes,an expansion rod sliding inside the tubular member and having a widened head,a body fastened to the tubular member and having a bore which extends the bore of the tubular member, and a support surface substantially at right angles to said bore,a locking member which can be immobilized at any point on the rod,an elastic member capable of exerting a determined force tending to move the body away from the locking member.The tubular member, the body and the elastic member preferably form a single piece.

Abstract: A high strength, high clamp blind bolt for fastening structural workpieces, which blind bolt has a core pin with a blind side head and a plurality of locking grooves or threads, a high stand-off collar adapted to be swaged into the locking grooves or a nut adapted to be threaded onto the pin threads, a compression frangible main sleeve structure and an expandable, short fixed length blind side sleeve structure; the blind bolt is set by a relative axial force applied to the pin which forces the short blind sleeve structure against the main sleeve structure causing the blind side sleeve to expand and form a blind side structural load bearing blind head; the relative axial force can be applied by pulling in a swage configuration or by torque in a threaded configuration; the core pin head acts on the main sleeve structure to cause a frangible portion to shear and reduce the main sleeve structure length after which the blind head engages the blind side of the workpieces; the high stand-off collar is then swaged in

Abstract: An expansion dowel has a friction reducing coating on the contacting surfaces formed by an inside surface an an expansion sleeve and an outside surface of the shank contacting the inside surface of the sleeve. The coating effects a smaller friction value between the expansion sleeve and the expansion part than the friction value between the expansion sleeve and the surface of a borehole into which the dowel is inserted. This difference in friction assures an effective re-expansion of the expansion dowel in a fractured or broken tensile zone of a receiving material containing the borehole. In addition to the coating, protrusions arranged in pairs are formed on the outside surface of the expansion sleeve for maintaining contact with the borehole surface, particularly in the broken tensile zone during large displacement of the expansion dowel.

Abstract: A temporary fastener that fastens two adjacent workpieces. The fastener includes a shank that extends through a hole of the workpieces. Extending from one end of the shank is a conical shaped head. The fastener also contains a pull stem which has a head located adjacent to the blind end of the shank. The stem head is pulled through the shank to expand and tightly fasten the shank to the workpieces. The fastener is removed by drilling through the head and the shank. The diameter of the conical shank head is smaller than the diameter of the drill so that part of the head does not become attached to the drill bit and scratch the workpiece. The conical shape of the head also reduces the volume of fastener material to further reduce the size and amount of chips produced during the drilling process. The tightly engaged shank prevents the fastener from rotating during the drilling operation.

Abstract: A method for creating a hole for a permanent fastener that replaces a temporary fastener that fastens two adjacent workpieces. The temporary fastener includes a shank that extends through a hole of the workpieces. Extending from one end of the shank is a conical shaped head. The temporary fastener has an inner channel that extends through the shank from the head to the opposite end. The fastener also contains a pull stem which has a head located adjacent to the blind end of the shank. The stem head is pulled through the shank to expand and is expanded to tightly fasten the shank to the workpieces. The fastener is removed by drilling through the head and the shank. The diameter of the conical shank head is smaller than the diameter of the drill so that part of the head does not become attached to the drill bit and scratch the workpiece. The conical shape of the head also reduces the volume of fastener material to further reduce the size and amount of chips produced during the drilling process.