Abstract: A rock anchor adapted to be mounted in a bore opening at a rock face has a sleeve extending along a sleeve axis and having a body extending along an axis and having an inner end remote from the rock face and an inside surface and an outer end formed with a large-diameter head adapted to lie against the rock face. A wedge in the sleeve at the inner end has a flank extending at an acute angle to the axis. This wedge is fixed in the sleeve against axial movement therein. A drive pin engageable axially in the sleeve has a point engageable between the wedge flank and the inside surface of the sleeve so that when the sleeve is forcibly driven axially into the sleeve its point engages between the flank and the inside surface and plastically deforms the inside surface outward into tight engagement with the rock.

Abstract: This invention relates to an improved blind fastener assembly and an improved joint assembly using the blind fastener assembly. The blind fastener assembly is adapted to be installed in a workpiece having a first and a second surface with an opening therebetween. The blind fastener is of the type having a core pin, expander means, expandable sleeve means, and resilient washer means, each having an initial diameter which permits it to pass through the opening in the workpiece. The improvement in the blind fastener assembly in accordance with this invention comprises the washer means having two portions including an inner portion and an integrally formed outer flange portion. The inner portion has a tapered nose section tapering outwardly away from the core pin shank portion to facilitate expansion of the sleeve means over the inner portion. The integrally formed outer flange portion is adapted to be unfolded by the sleeve means to form a bearing surface against the second surface of the workpiece.

Abstract: A fixing element for securing a facing panel to a masonry and anchorable in an undercut of a drilled hole formed in the facing panel, has an expansion member with an expander cone, formed at an end thereof and a shank portion extendable beyond the rear surface of the facing panel and projecting into the masonry. Holding elements is formed on the shank portion to reliably fix the shank portion in the masonry, and an expansible sleeve is displaceable over the expander cone for anchoring the fixing element in the undercut of the hole drilled in the facing panel.

Abstract: An anchor bolt having a spring member is provided, with the anchor bolt comprising a fastening sleeve, an expansion sleeve and an expansion body. The spring member is interposed between the fastening sleeve and the expansion sleeve, and the expansion body is disposed at one end portion of a threaded rod formed as an anchor main body and is adapted to be inserted deep in a hole of a concrete structure together with the threaded rod. The said fastening sleeve and spring member are loosely fitted on the threaded rod, wherein the fastening sleeve adapted to be fixed within an inlet portion of the hole compresses the spring member to urge the expansion sleeve toward the expansion body so as to be expanded thereby, thus preventing the anchor bolt from being removed from or being loosened in the hole. The fastening sleeve preferably comprises an opening through which an end portion of the spring member extends to be exposed for visual inspection.

Abstract: An expansion wall-plug is provided having two branches (5,6) of a wire (1) bent upon itself, an expansion stirrup-piece (2), between the branches (5,6), and an expandable socket (3). The rods (5,6) have engagement projections (11,12) against which a washer (4) is in abutment. The rear part of the socket (3) extends beyond the engagement projections (11,12). One of the branches (6) is extended beyond the other by means of a connecting portion (9) having a sealing end (10).

Abstract: An expansible anchoring plug assembly for anchoring objects to a supporting structure and insertable in a hole having a widening undercut portion comprises a slotted expansible sleeve pushed onto an expander cone which is inserted into the hole upon the rotation of the threaded bolt fastened to the part carrying the expander cone. The expander cone is provided at its end face with a projection or ridge which acts on the bottom wall of the hole and secures the expander cone against rotation.

Abstract: A wall plug anchor assembly is provided including a sleeve, a spherical body for flaring anchoring ends of the sleeve which body is inserted from a head end of the sleeve into an unslotted portion thereof, and a driver. By means of the driver, the spherical body is forced forward against concrete material which has entered into the sleeve interior. The operative end of the driver includes a wedge surface by and over which the spherical body can be laterally displaced away from a central axis of the sleeve in a direction of the sleeve walls in a wedge-induced or clamping movement.

Abstract: The wall plug anchor assembly is applicable to heavy-duty and reinforced concrete and the like, of a construction component such as a wall and the like environments. The wall plug anchor assembly includes a metallic sleeve having a head of a respectively greater diameter than the sleeve body, of a metallic material, such as a plastically deformable steel of German steel quality ST 34 or ST 37, and wedge means for permanently modifying the sleeve at a location remote from the crown end thereof, particularly to permanently modify the transverse cross-sectional dimension of the sleeve, for example to enlarge the diameter by plastic deformation of the sleeve walls.

Abstract: A spreading plug for anchoring in undercut boreholes comprises a plug shaft, a spreading body connected with the plug shaft, a thread connecting the spreading body with the plug shaft, a plurality of spreading segments which are spreadable over the spreading body, the spreading body having an end side, a safety element projecting from the end side of the spreading body for preventing rotation, the spreading segments being formed on the plug shaft and extending in direction toward the spreading body, the plug shaft having a mounting part facing away of the spreading body, and an element for cooperating with a rotary tool and provided on the mounting part of the plug shaft.

Abstract: A scaled releasable fastener for temporarily joining a plurality of sheets through apertures located in the sheets has a body with a work engaging surface and an opposite surface. The body includes a longitudinal bore extending through the body from the work engaging surface to the opposite surface. A pair of laterally expandable work engaging pins are positioned in the bore. Each of the pins has a work engaging shoulder. A spreader member is fixedly carried by the body and is positioned between the work engaging pins for laterally spreading the pins apart upon retraction of the pins into the bore. An elongated element is positioned in the bore in association with the pins for moving the pins in the bore. A portion of the elongated element extends out of the body from the opposite surface of the body with the remaining portion of the elongated element located in the bore and connected to the pins. Indicia marks are located on the elongated element to be readable against the opposite surface of the body.

Abstract: The invention comprises a quick disconnect apparatus for locking a tubular table leg to a table top. An insert plug extends downwardly below the table top and carries an annular resilient member which is inserted into the table leg. An actuator has a camming surface and is movable between two positions. In one position, it pulls the resilient member into forceful engagement with a ramped lower extension of the plug, causing the resilient member to expand and frictionally engage the inner surface of the leg, locking it in place. In its other position, the actuator releases the resilient member, causing it to relax and disengage from the leg.

Abstract: A method and apparatus for tunnel lining is provided made up of arcuate liner segments having a formed body with two end walls and two substantially parallel sidewalls, at least two pins extending from one sidewall intermediate its length in the median plane of the body and transverse to said sidewall, a like number of openings in the other sidewall each adapted to receive one of said at least two pins from two adjacent interfitting segments and locking means in said opening permitting insertion of said at least two pins in said openings of adjacent segments and lockingly engaging the same against removal and urging said two adjacent fittings into tight end to end engagement.

Abstract: An anchor bolt assembly includes an axially elongated bolt and an axially elongated expanding sleeve laterally encircling the bolt. The sleeve is axially slotted from its leading end. The bolt includes an axially elongated cylindrically shaped shank with a frusto-conical section at its leading end and means for attaching a load to the bolt at its trailing end. A stop extends axially outwardly from the leading end of the frusto-conical section. In the axially extending region of the slots, the outer surface of the sleeve has an axially extending reduced diameter section.

Abstract: An expansible anchoring plug for anchoring by impact in undercut pre-drilled holes, especially in holes which are widened towards their inner end, comprises an expansible sleeve which has an internal bore and which it is slotted over a part of its length and which can be anchored by driving it onto an expander body provided with an expander cone located at the bottom of the pre-drilled hole. The expander body is provided with a tubular extension engageable in an internal bore of the expansible sleeve. The end of the extension, once the expansible sleeve has been driven onto the expander body, is located in an enlarged portion of the internal bore of the expansible sleeve and is secured therein by a wedge.

Abstract: A method for preventing corrosion of an expandable mounting element which involves introducing a sealing composition into a mounting hole of a support structure first to fill the hole about half-way, then driving an expandable mounting element into the half-filled hole to displace the sealing composition initially against the base of the mounting hole and then up along the surface of the expandable mounting element until the excess emerges out of the mounting hole. A compressible impact device, which has an upper and lower part and a spring part fixed therebetween, is arranged so that an impact tool can be driven against the upper part to fully drive the expandable mounting element into the mounting hole, effecting a sealing compaction in correspondance with the pressure exerted by the spring part. All gaps and cracks are thereby sealed against corrosive media.

Abstract: A blind fastener comprising:a nut with an axial bore therethrough, a bolt extending through the nut with a sleeve encircling the bolt between the head of the bolt and the nut body, and a stop ring provided on a screw threaded portion of the bolt, the bolt having a break groove therein, between the nut body and the bolt head. As the bolt is advanced upwardly during installation, the stop ring abuts the terminal end of the nut body. This sudden resistance to further travel causes the screw threaded portion to fracture at the break groove thus providing a clean break at the break groove substantially filling a cavity in the nut head thereby increasing the strength of the installed fastener and eliminating any need for shaving off the broken-off screw threaded portion.

Abstract: An expansion anchor assembly for use in a borehole with an annular undercut includes a threaded anchor stud with a head part at its leading end inserted first into the borehole. Locking elements are arranged around the anchor stud at the head part, a conically shaped member is arranged to expand the locking elements in the radial direction, and an annular abutment member is in threaded engagement with the anchor stud and is arranged to axially displace the conically shaped member. By threading the abutment member toward the leading end of the anchor stud, the locking elements are displaced radially outwardly in the annular undercut. The radially outer surface of the abutment member is located within the axial projection of the radial outer surface of the conically shaped member. Accordingly, the abutment member and conically shaped member can be countersunk relative to a part to be secured to the material in which the borehole is formed.

Abstract: A three piece blind fastener of the kind comprising a tubular nut having a head at one end and a tapered nose at the other end, an expansible sleeve, and a headed bolt threadedly engaged with the nut for forcing the sleeve on to the nose of the nut to form a blind head, has the thread of the nut provided with a locking zone in which the bore of the nut is constricted and, in cross sectional shape, a closed non-reentrant non-circular curve so that the nut resiliently interferes with the bolt.A die, and a method of providing the nut with the locking zone by means of the die are disclosed. The die has a tapered aperture having a cross sectional shape corresponding to the desired shape of the locking zone, and the method involves forcing the tapered nose of the nut into the aperture so as to constrict the bore, in a zone spaced from its ends, to the desired extent and impose the non-circular cross sectional shape on the constricted zone.

Abstract: The dowel (14) comprises an elongated fastening bolt (26) provided at its rear end, at the outer end of the hole, with a threaded nut or bolt head (30), a head part (34) being arranged at its front end, at the inner end of the hole, upon which are mounted, by means of a conically tapering component (38) arranged displaceably upon the said fastening bolt, locking elements (36) adapted to pivot radially outwardly into a position engaging in the undercut. Displacement of the said conically tapering component is effected by a distance sleeve (42) arranged upon the said fastening bolt (26) and adjoining the said conically tapering element.

Abstract: A blind fastener is provided for connecting two workpieces together, comprising an internally threaded fastener body and an externally threaded stem passing in threaded engagement therewith. A drive nut is mounted on the stem in contact with the fastener body for preventing rotation thereof upon turning of the stem to install the fastener. The outer end of the stem has a cap nut to enable turning of the stem. Both the drive nut and cap nut are engaged by wrench components of an installation tool to cause turning motion of the stem relative to the fastener body to deform a sleeve around the fastener body into contact with one surface of the two workpieces. Although the fastener may vary in size depending upon the nature of the two workpieces to be connected together, the outer dimensions of the drive nut and cap nut remain constant for all fasteners regardless of differing stem diameters of different size fasteners.

Abstract: A flush break blind fastener is provided having as principle components a stem member, a drive-nut, and a deformable annular means. The stem member has an externally-threaded-portion on the accessible-side thereof, and may have a stem-head on the nonaccessible side thereof. The drive-nut is screwed onto the externally-threaded-portion of the stem member. The deformable annular means has as principle parts a head which is larger in diameter than the diameter of the boreholes of the workpieces, and an intermediate-part adjacent the head, and a deformable tail-part adjacent the intermediate-part and abutting the stem-head for securing the workpieces when the fastener is set. The outer-portion of the stem member contains a turning means for rotating the stem member relative to the drive-nut.

Abstract: A blind fastener for installation in aircrafts or the like and method for forming same comprised of a threaded nut threaded on a threaded screw or stem member having a stem head with a deformable sleeve mounted on the stem member between the stem head and the threaded nut. A torque lock is created between the threaded nut and the stem member to provide torque of the nut against the threads of the stem member without damaging the threads of the nut and the stem member.

Abstract: A device is provided which can join pre-drilled substrates such as panels, and can establish a threaded attachment post securely anchored to a substrate. The device is comprised of a hollow sleeve, and an internal rotatable core. When the device is inserted into a hole, and the core is rotated relative to the sleeve, prongs in the inserted extremity of the sleeve are forced into tight engagement with the hole. The opposite, uninserted extremity of the sleeve is provided with external threading, useful for general mounting purposes.

Abstract: An expansion anchor for anchoring in drill-holes, preferably in drill-holes having undercuts widening inwardly, comprises an expansion member having an expander cone supported at the bottom of the drill-hole, and an expansible sleeve driven onto the expander cone. The expansion member has an element for fastening or securing articles. The expansion member is punched out from sheet steel and the expander cone is rolled from a suitable flat blank. The gap provided at the outer surface of the expander cone is calibrated for closure.

Abstract: An expansion dowel arranged to be anchored in a borehole includes an axially extending dowel member having a leading end and a trailing end and being partly sleeve-shaped extending from the trailing end. A wedge-shaped recess is formed inwardly from the outside surface of the dowel with the depth of the recess decreasing toward the leading end of the dowel member. A complementary shaped wedge member is located in the recess and is displaceable therein toward the leading end of the dowel member. An annular groove formed in the dowel member from the leading end toward the trailing end. The depth of the annular groove increases for at least a part of the axial length from the leading end of the dowel member. An expansion member is seated in the annular groove and extends around the dowel member. The expansion member has a stop shoulder located in the path of the wedge member as it is displaced toward the leading end.

Abstract: An anchoring bolt (1), which can produce a conical undercut by rotation in a cylindrical hole and serves simultaneously as a securing element has a connection portion (2), a shaft (4) and an insertion portion (5). The insertion portion (5) has an axially extending slot (6) forming two spreadable branches (8,9), into which slot a movable spreading wedge (18) can be driven in with its tapered end. The branches (8, 9) are each provided with drillings (14, 15) receiving hard metal pins (16, 17) of which the front edges, in the rotation direction, are more protuberant than the rear edges so as to form a clearance angle .alpha..

Abstract: An expansion dowel assembly includes an axially extending dowel and an expansion member. In the expansion step the expansion member is axially displaced over a surface on the dowel providing form-locking engagement of the dowel assembly within a borehole. The surface on the dowel, over which the expansion member is displaced, is made up of two serially arranged axially extending surface sections. Each surface section is disposed at a different acute angle to the dowel axis.

Abstract: An off-center rock bolt anchor includes a wedge nut having a modified frusto-conical lower end portion having a first surface portion with an enlarged radius of curvature matching that of the mine roof bolt hole. A threaded hole for receiving the shaft of a roof bolt extends longitudinally through the wedge nut parallel to and close to the first surface. A locking cam with outwardly oriented teeth is pivotally connected to an off-center portion of the top surface of the wedge nut. A plurality of expansion wings are positioned around the lower conical portion of the wedge nut and expand outwardly to engage the walls of the bolt hole as the wedge nut is tightened onto the roof bolt. Initial rotation of the bolt causes eccentric rotation of the wedge nut that urges the teeth of the locking cam to engage the side of the bolt hole.

Abstract: A blind fastener particularly suited for mechanically joining composite structures such as graphite and fiber/epoxy matrix with a minimum of blind side damage. A first sleeve of highly ductile material is disposed as a liner about the portion of the nut which passes through the composite materials. The first sleeve extends longer than the thickness of the materials. A second sleeve of measurably less ductility is disposed between the first sleeve and the head of the threaded corebolt. The two sleeves have abutting surfaces which are non-sliding whereby as the nut and corebolt are threadily engaged and the two sleeves are brought into compression, the less ductile sleeve flairs the more ductile sleeve about the nut to create a protected area about the blind side of the materials.

Abstract: A tubular fastener has an axially extending tubular shank receivable in a work bore and an annular head receivable in forcible engagement with the work material forming a counterbore. The fastener also is characterized by:(a) the head having an annular end face, a first forwardly tapered section located forwardly of that end face to forcibly engage the work counterbore and a second forwardly tapered section located forwardly of the first section, the taper angularity of the second section substantially exceeding the taper angularity of the first section,(b) a stem extending through the tubular shank and head, and(c) structure responsive to retraction of the stem toward the head end of the fastener to expand at the opposite end of the fastener and axially retain the fastener in position with the head first section forcibly engaging the counterbore, in non-rotating condition.

Abstract: A coupling device for coupling together a plurality of plates which includes a push pin which clasps one of the plates and which has a leg formed on its undersurface, a carrier box which is inserted and anchored in a slot formed in another of the plates and which has a slide slot formed in its undersurface and an engaging base which is loosely inserted into the slide slot of the carrier box so that it is free to move in a horizontal plane and which has arms formed on its upper surface that resiliently clasp the leg of the push pin.

Abstract: A fastener for securing an object to a concrete mounting pad is provided with an elongated interiorally threaded annular core. The upper section of the core is of a cylindrical outer configuration while the lower section is tapered as a fustrum of a cone to an overhanging ledge at the lower extremity of the upper section. An expansion device includes two half rings, initially held together by tape. The expansion device encircles the conical fustrum just below the ledge. Upward force upon the core pulls a larger portion of the fustrum through the half rings, thus directing them radially outward and securing the expansion device and the core captured by it in an anchor shaft in the concrete. Conversely, downward force on the core removes the radially outward force on the expansion device and allows the anchor to be driven to the bottom of the anchor shaft bore.