Abstract: A two-part fastener with an insert and a compression sleeve. The insert is an internally-threaded fastener intended to be installed into a hole of a very hard panel. The insert itself is relatively hard with a knurled outer barrel portion and a flange at the bottom. A compression sleeve is made of relatively soft material and is preassembled around the barrel of the insert by friction fit. Upon installation into a panel with a blind hole having parallel sides, the compression sleeve is pressed into the panel and deforms outwardly between the insert and the side wall of the hole. Friction between the compression sleeve and the wall of the hole prevents torque out and pull out of the fastener from the panel.

Abstract: An expansion anchor with a bolt and at least one expansion element is disclosed. An oblique surface is arranged in the region of the first end of the bolt and forces the expansion element radially outward on the bolt if the bolt is displaced in a pull-out direction relative to the expansion element. The bolt has, in the region of its rear end facing away from the first end, a load-absorber which is suitable for introducing tensile forces which are directed in the pull-out direction into the bolt. A plurality of grooves that are closed with respect to the first end of the bolt are disposed in the oblique surface and the plurality of grooves reduce a contact surface between the expansion element and the oblique surface. The contact surface between the expansion element and the oblique surface is reduced by the plurality of grooves by 20 to 50%.

Abstract: The invention relates to an expansible fixing plug (1) which consists of at least two different plastics materials, having a main body (2) made of the first plastics material, which is at least partly encased by a casing (3) made of the second plastics material. The main body (2) has an expansion region (5), which extends along a longitudinal axis (L) between a sleeve (6) and an insertion sleeve (4) forming the rear end of the expansible fixing plug (1), in which expansion region there are arranged at least two expansion tongues (11, 12) which are separated from one another by a first slot (13), the first slot (13) being at least partly filled in the expansion region (5) by a casing element (21) of the casing (3). In order to obtain an expansible fixing plug (1) having improved expansion behavior, it is proposed that on at least one expansion tongue (11, 12) there be arranged a local weakened position (17) as predetermined bending point.

Abstract: The invention relates to an expansible fixing plug (1) which consists of at least two different plastics materials, having a main body (2) made of the first plastics material, which is at least partly encased by a casing (3) made of the second plastics material. The main body (2) has an expansion region (5), which extends along a longitudinal axis (L) and has at least two expansion tongues (11, 12) which are separated from one another by a first slot (13), and a sleeve (6) arranged at the front of the expansible fixing plug (1) in the direction of introduction (E). The sleeve (6) is connected to the expansion region (5) and is at least partly encased by a casing body (18) formed by the casing (3).

Abstract: A fastener adapted to be installed in a hole of a composite structure includes a sleeve, a pin member, and a locking member. The sleeve has an outer surface having an outer diameter. The outer surface of the sleeve is textured. The outer diameter of the tubular portion is less than an inner diameter of the hole of the structure. The pin member has a shank portion. The sleeve is adapted to expand radially over the shank portion of the pin member to form an interference fit between the outer surface of the sleeve and the hole of the structure so as to provide an installed position of the fastener. When the fastener is in the installed position, the texture of the outer surface of the tubular portion deforms to engage with voids of the composite material present on the inner surface of the hole.

Abstract: A woven retention device for interfacing with a bone surface includes interwoven filaments forming a tubular lattice with protuberances distributed on interior and exterior surfaces of the lattice at a predetermined spatial relationship. The protuberances are formed by intersecting interwoven filaments. The retention device receives and surrounds a fastener. In a first, relaxed state, the retention device has multiple combinations of filament cross-section geometries at the intersection points, and the multiple combinations of filament cross-section geometries form multiple protuberance thicknesses. In a second state when surrounding at least a portion of the fastener, the retention device distributes pressure from the fastener to multiple points of contact on the exterior surface of the retention device such that a spatial relationship of the protuberances changes as a function of bone density of the bone surface and as a function of an interfacing surface shape of the fastener.

Abstract: Described herein are various embodiments of a fastener anchor assembly for securing a fastener includes a base and a recess formed in the base. The recess has a substantially non-circular cross-sectional shape. The assembly further includes an insert positionable within the recess. The insert has a substantially non-circular cross-sectional shape corresponding with the non-circular cross-sectional shape of the recess. Additionally, the insert includes a fastener opening and at least one flexible portion. The flexible portion flexes to engage the recess as a fastener moves through the fastener opening.

Abstract: According to embodiments of the present invention, a clip includes: a plate spring member having a leg portion and flange portions; a pin member having a shaft portion and a head portion. The leg portion has: inclined portions outwardly extending from a bent portion; engagement portions inwardly extending from the inclined portions; and abutting portions connected between the inclined portions and the flange portions. The shaft portion has: a proximal-side diameter-expanded portion; and a distal-side diameter-reduced portion. When the plate spring member is assembled with the pin member and flange portions abut a front side circumference of the mounting hole, the diameter-expanded portion abut the abutting portions to expand the leg portion through a further pushing operation of the pin member thereby engaging the engagement portions with a back side circumference of the mounting hole.

Abstract: A bolt anchor is comprised of a body and sleeve. The body is generally wedge shaped with a threaded bore along its axis and at least one stop near its smaller end. The sleeve has a round collar with leaves extending from the collar parallel to the axis of the collar and each other. The at least one stop maintains the assembly of the body and sleeve. Prongs on the sleeve prevent the retraction or turning of the bolt anchor when a bolt is installed in a hole using the bolt anchor. Reduced material thickness associated with the leaves on the sleeve produces hinges which allow the leaves to be more easily deformed outwardly to engage the sides of a hole. Inserting a bolt and bolt anchor assembly into the hole and then turning the bolt pulls the body into the sleeve and creates a wedging effect in the hole.

Abstract: A grout and lifting tube for casting within a concrete segment. The tube provides enhanced sealing between the tube and the concrete to prevent moisture leakage into a structure formed by a plurality of the concrete segments. The tube includes a generally cylindrical body having an exterior with an anchoring rib structure, a threaded interior, a proximal end, a distal end. An annular gasket is disposed at the proximal end of the tube body, and may be secured to the proximal end of the tube body by a mechanical interlock and/or by unitary co-molding. After the concrete section is placed and grout is pumped through the tube, a plug is threadable into the proximal end of the tube to both compress the gasket between the plug and the tube at a first seal, and to compress the gasket between the plug and the concrete surrounding the proximal end of the tube at a second seal to provide robust, watertight sealing.

Abstract: An expandable collet body and anchor system incorporating a collet body anti-rotation feature and preferably collet body translation arresting means are disclosed. The collet body includes a first end, a first wall portion having at least two fingers, a second end including a head, a second wall portion, an annular protrusion and anti-rotation means where the anti-rotation means engages with an auxiliary structure defining a hole having an internal surface adapted to translationally accept the collet body and operatively function with the collet body anti-rotation means. The auxiliary may include a work piece to be optionally joined to another structure or a sleeve insert locatable in a hole defined by a work piece. Because the collet body is relatively free to translate within the auxiliary structure, a wide spectrum of work piece depths can be engaged with a single length collet body with the use of a stud to radially expand the fingers, thereby engaging a distal structure.

Abstract: A collet body and captive stud combination is disclosed wherein the collet body has a first end and adjacent first wall portion, and a protrusion extending from an exterior surface thereof. The first wall portion also defines at least two secondary slots to create at least two fingers. The collet body also has a second end including a collet head and an opening for receiving a stud. At least a portion of an interior surface of the collet body is threaded to rotationally receive a threaded stud. The stud includes a head, a body portion being at least partially threaded, a distal end and at least one radially extending protrusion at or proximate to the distal end. The protrusion may be circumferentially continuous or discontinuous.

Abstract: An anchor device includes an expansion bolt and a fastening screw. The bolt has a tubular body. The tubular body further has a central shank and a head, which is integrally made with the central shank and has a full solid body on which a pair of longitudinal reciprocally perpendicular through slots are made which delimit four anchor segments adapted to spread outwards under the bias of the fastening screw. The central shank has a first portion arranged next to the head on which a plurality of longitudinal through slots define longitudinal anchoring tabs which expand radially outwards under the bias of the fastening screw following the spreading of the four anchor segments.

Abstract: A support device is disclosed for supporting an article. The device has a shank having a first and a second end. The first end may be driven into a member for securing the shank therein. A first and a second support member outwardly extend from the shank. The first and the second support member support the article when attached to or suspended from at least one of the first and the second support member.

Abstract: The invention provides a rivetless nut plate including a nut, a holding bracket having tubular and bracket portions, and a stem having an enlarged head. The stem is positioned within an aperture of the tubular portion such that the head is resting on a shoulder within the bracket aperture. The tubular portion is positioned within an aperture of a workpiece, such that the bracket portion rests on top of the workpiece. The nut is retained within the bracket portion. Force is applied to a bottom of the workpiece and another opposite force is applied to the stem such that the head expands the tubular portion radially outwardly such that lobes on the tubular portion become embedded into the wall of the workpiece, thereby securing the nut plate to the workpiece. The holding bracket could also be formed of two separate elements, a sleeve having a tubular portion and a bracket.

Abstract: A method and apparatus removably and replaceably mounting a member in a hole that provides sufficient support for the member while also improving installation time of the anchor holding the member in place includes use of a drive anchor system. The drive anchor system includes a drive anchor. The drive anchor includes a hollow shaft having an internal chamber, an external wall, a first end, and a second end. A surface feature is disposed on the external wall for providing anchoring functionality. A bifurcating crevice extends from the second end of the hollow shaft toward the first end of the hollow shaft, and creates a first leg and a second leg of the hollow shaft. A member coupling is sized and dimensioned to fit within the internal chamber of the drive anchor, such that the member can couple with the member coupling.

Abstract: The dowel's expansion bushing (2) is placed around a threaded rod (9) inserted in the bushing's (2) expansion core (3), between the strut (8) and the core (3). The bushing (2) includes a section (16) compressible along its centerline, which includes a shearing system (24) placed such that, after shearing, the bushing (2) is shortened along its centerline. The bushing also includes, on its section (25) next to the strut (8), coupling and axial holding spurs (50). The bushing (2) is composed of a cut sheet metal blank, rolled on itself, except for the part with the spurs (50).

Abstract: A joining assembly for joining a pair of structural members, comprises a bolt having a thread and a nut-like blind rivet adapted to be inserted into mounting holes of the structural members and to be threadingly engaged to each other. One of the mounting holes is made of resiliently deformable material and comprises a base member including a bore for receiving the thread of the bolt and having an outside provided with a plurality of threads which are similar in number to the corners of the polygonal mounting hole, such that when the bolt is threadingly engaged into the bore of the blind rivet the base member is folded whereby the threads have parts of their flanks pressed against one of the structural members.

Abstract: A connecting element for connecting two structural components, particularly furniture plates, includes a sleeve with an upper part and a lower part and a bolt having a rearward bolt end and a forward bolt end mounted in the sleeve. The lower part of the sleeve together with the rearward end of the bolt can engage in a recess of a first structural component and the upper part of the sleeve and the forward end of the bolt can engage in a recess of a second structural component and a head of the bolt at the forward end of the bolt can engage in a supporting or clamping device arranged in the second structural component. At least one brace is mounted on a portion of the upper part of the sleeve adjacent the lower part of the sleeve, wherein the at least one brace extends obliquely outwardly towards the lower part of the sleeve and is pivotably towards the sleeve.

Abstract: An expansion anchor comprises a stud having threads including a root, a land, and a taper extending between the root and the land and a helical member having a leading edge threadingly engageable with the threads, wherein the helical member is movable between an unexpanded position and an expanded position, wherein in the expanded position the leading edge is forced radially outwardly by the land. In one embodiment, the helical member includes a finger extending in a leading direction. A method also is disclosed for anchoring the inventive stud within a hole in a substrate by expanding the helical member until the leading edge is wedged between the land and a wall of the hole.

Abstract: The present invention provides a tacking rivet for fastening work pieces together which have aligned apertures therethrough. The tacking rivet includes a head portion and an elongated sleeve portion extending from the head portion. Both the head portion and the sleeve portion have openings therethrough which are in alignment with one another. The tacking rivet further includes a plurality of rib portions positioned on an outer surface of the sleeve portion which are capable of engaging with walls of the apertures of the work pieces when the sleeve portion is expanded within the apertures of the work pieces. Because the rib portions engage with the walls of the apertures of the work pieces, the tacking rivet will not rotate within the apertures during a drilling operation to remove the tacking rivet from the apertures prior to the installation of a permanent fastener to fasten the work pieces together.

Abstract: The present invention is directed to developments in the fields of dentistry and dental surgery, and particularly to an improvement in dental restoration apparatus. Typically, apparatus of this type includes an implant adapted to be implanted in an anchor site fashioned within the bone of the jaw of the patient. In addition, the apparatus includes an abutment ultimately providing support for a tooth restoration. Finally, the apparatus includes a fastener assembly for engaging both the implant and abutment in their mounted orientation, and securing the two structures together in a manner to positively resist relative movement both axially and rotationally.

Abstract: A fitting to be removably fastened to a furniture part includes a body, at least one expanding plug anchored in the body, and a pin-shaped expansion part. The body has a projecting supporting throat to protrude into a cavity in the furniture part. The supporting throat has at least one recess into which a projection on the expanding plug extends.

Abstract: The present invention provides a tacking rivet for fastening work pieces together which have aligned apertures therethrough. The tacking rivet includes a head portion and an elongated sleeve portion extending from the head portion. Both the head portion and the sleeve portion have openings therethrough which are in alignment with one another. The tacking rivet further includes a plurality of rib portions positioned on an outer surface of the sleeve portion which are capable of engaging with walls of the apertures of the work pieces when the sleeve portion is expanded within the apertures of the work pieces. Because the rib portions engage with the walls of the apertures of the work pieces, the tacking rivet will not rotate within the apertures during a drilling operation to remove the tacking rivet from the apertures prior to the installation of a permanent fastener to fasten the work pieces together.

Abstract: A forged, integral bolt (20) has a head, a tapered neck (22), a shank, and a plurality of plastically deformable, raised, contact surface portions (31) uniformly positioned adjacent the neck and extending axially and radially of the bolt for spreading a load applied to the bolt. Each raised portion has a base portion contiguous the neck, and an elongated, V-shaped, ridge portion raised above the base which is constructed to contact and fay with a congruent wall portion of a bolt bore (12) in a support structure. The bolt may have various shapes. (FIGS. 1-3, 10-23). The ridges may extend up onto the sides of the head. (FIG. 9). The ridge portions and base portions may be integrally forged as a pair of symmetrical, self-aligning, inserts (40) separate from, but mating with, opposite sides of the neck when a load is applied to the bolt.

Abstract: A rigid bar of material is fastened to a circuit board to increase its stiffness. The bar is preferably a high modulus plastic such as liquid crystal polymer. Flexible fingers which surround a central opening are formed integrally with the bar and pop into throughbores in the circuit board. Each finger has at least one arcuate protrusion and, preferably several, which can engage the bottom of the circuit board. A rigid pin which may be made of steel is slid into the central opening and has an interference fit therewith to hold it in place to prevent flexible fingers from moving inwardly so the stiffener is held fast to the circuit board.

Abstract: An expansion anchor including an anchor rod (1) having a head (2) widening in an insertion direction S; and a sleeve (3) having a plurality of expansion tabs (6) separated from each other by slots (5) and extending from a plastic hinge (4) toward a free front end (7) of the sleeve (3), the expansion tabs (6) expanding radially upon relative displacement of the sleeve (3) and the anchor rod (2) and having each at least one groove-like depression (8 or 9) which opens in a region of the free front end (7) and extends at least along a portion of an axial length (1) of an expansion tab (6), with the groove-like depression (8 or 9) being inclined toward a straight line (G) extending parallel to a sleeve axis (A).

Abstract: A bolt anchoring device for insertion into a bore in a concrete ceiling or the like material is provided. The bolt anchoring device comprises an anchor sleeve and a bolt. The anchor sleeve is first inserted in the bore for its provisional or temporary attachment. The bolt is then screwed into the anchor sleeve for permanent attachment of the anchor sleeve and the bolt. In one embodiment, the bolt is removable after permanent attachment of the anchor sleeve. The anchor sleeve has a self-retaining means for retaining itself in the bore at the time of its provisional or temporary attachment. The anchor sleeve has a first end portion having a threaded hole and a second end portion having a plurality axial slits. The bolt has an integral plug portion which is pushed into the second end portion to expand the second end portion and make it cut into an inner wall surface of the bore for thereby firmly securing the anchor sleeve in the bore.

Abstract: An expansion dowel (1) includes an axially extending cylindrical sleeve (2) and an expanding body (3). The sleeve (2) has an axially extending bore (5) and an axially extending expansion section (6) with axially extending slits. The bore (5) tapers inwardly to the leading end of the sleeve in the expansion section (6). The expanding body (3) is received in and expands the expansion section (6). Circumferentially and axially extending approximately V-shaped grooves 9 are formed in the outside surface of the expansion section and/are spaced apart by circumferentially and axially extending cylindrical surface sections (8). The approximately v-shaped grooves have flanks defining an angle (.alpha.) in the range of approximately 120.degree. to 140.degree..

Abstract: A spreading anchor including an anchor rod (2) having a stem (12) provided at its front end, when viewed in a setting direction, with a cone (3) widening outwardly towards its free end and a longitudinally displaceable sleeve (4) pushed over the anchor rod (2) and having at a front end (8) cutting tabs (5) which are provided with cutters, are separated from each other by gaps, extend from a plastic hinge (11) toward the cone (3), and are spread radially upon sliding of the sleeve (4) over the cone (3), the sections of the cutting tabs (5), which extend from free ends thereof in a direction toward the plastic hinge (11), having an outer surface (6) remote from the cone (3) and formed at least in their cutting region thereof as a substantially toroidal surface.

Abstract: The fixing element for securing an article on a base material includes a shank having a shank portion for receiving an article to be fixed, a reduced diameter portion having opposite ends including a free end and an expander cone located at the free end; and an expansible resilient sleeve received on the reduced diameter portion and having at an end remote from the expander cone lugs which are bent inwards at one obtuse angle. The lugs have end surfaces facing a transition shoulder between the other end of the reduced diameter portion and the shank portion. The expansible resilient sleeve has a length greater than the length of the reduced diameter portion. The expandsible resilient sleeve also has, in an unstressed condition, a sleeve outer diameter larger than the shank portion diameter and a sleeve inner diameter larger than said reduced diameter portion diameter.

Abstract: A dynamic electric machine such as a totally-enclosed fan-cooled machine has an end bracket having a plurality of seats to which a cover such as a fan cover is fixed through a plurality of generally cylindrical rubber bushings. The bushing has a nut embedded therein near one end thereof and an outer peripheral flange portion formed on the other end thereof. With the cover being placed on the flange portions, bolts are driven into the nuts from the outer side of the cover so as to fix the cover to the seats through the rubber bushings.

Abstract: An improved pin drive anchor has an elongated body with an inner end with a reduced section about which a locking sleeve member is secured, and a longitudinal bore extending the length of the body and having a reduced diameter section proximate to the sleeve member. The sleeve member and the body inner end are slotted to permit expansion of the sleeve member and the inner end when a pin is driven through the entire length of the body bore to firmly secure the anchor in the cavity of a wall.

Abstract: An expansion dowel includes an axially extending sleeve with a leading end and a trailing end. The sleeve is conically shaped for at least an axially extending portion from the leading end with the conically shaped portion diverging outwardly toward the trailing end. Axially extending projections protrude outwardly from the outer surface of the conically shaped portion of the sleeve and have at least one axially extending flank with a planar surface inclined relative to the axis of the sleeve. The at least one inclined flank forms a working surface which acts against any pulling out force on the sleeve and ensures high anchoring values.

Abstract: A suspension peg is provied in which the wire, obtained by die stamping a metal strip and bonding the same, forms a securing eye and has at its end, to be introduced into an anchorage hole, a cylindrical portion formed by two shells and a truncated expansion cone adapted for cooperating with an expandable anchorage socket under the action of a retractive force exerted upon the eye.

Abstract: The present invention relates to expansison anchors for solid wall installation and is specifically concerned with providing a self cutting expansion anchor which can be installed in one continuous motion by utilizing combined cutting blades and wall gripping members which cut their own undercut portion within a wall bore into which the gripping members are then permanently further expanded in positive locking engagement. Such dual-stage installation is achieved by utilizing an anchor mounting assembly having a pair or opposite-hand screw-threaded portions thereon which separately mount a blade expanding thrust member and a camming ramp on which the blades are initially expanded by axial movement of the thrust member toward the ramp and in the second stage causing the ramp to axially move toward the thrust member in further expanding relation to the blades.

Abstract: A plastic plug for anchoring objects in support structures comprises an expansible portion and an elongated neck having a head portion with a flange for supporting an object being secured to the support structure. The elongated neck is formed of two spaced expansible legs and has an elliptical cross-section which merges into circles at two end portions thereof. The expansible portions of the legs are provided with longitudinal grooves which form a widening of the longitudinal bore in the head portion.

Abstract: A fastener for anchoring in a bore in a bone has a screw having a substantially cylindrical outer surface formed with a helical screwthread. This screw has at its screwthread a thread diameter and between the turns of the thread at the surface a root diameter smaller than the thread diameter. A synthetic-resin anchor sleeve of a resilient fitted in the bore is of an outside diameter corresponding generally to the diameter of the bore and has an outer end formed with an outwardly open polygonal-section recess, an inner end formed with an inwardly open and transversely throughgoing slot, an outer end portion of an inside diameter greater than the root diameter but smaller than the thread diameter, an inner end portion of an inside diameter smaller than the root diameter, and an external helicoidal screwthread extending about two-thirds of the length of the sleeve from its inner end toward its outer end.

Abstract: An insert retention device for retention of same in a dielectric housing serving as a screwlock especially suitable for high speed connector assemblies; these insert retention devices are desirable because of their characteristics when cold pressed into a plastic housing and are useful for electronic printed circuit board assembly and the like.

Abstract: A fastener comprises two, i.e. male and female, members for coupling together a plurality of panels in a spaced-apart and face-to-face relation to one another. The female member has a locking body portion and also has locking pawl portions united by hinge portions to the locking body portion for flexing with respect thereto. The male member is fitted in one of two panels and detachably coupled to the female member fitted in the other panel.

Abstract: A threaded fastener for installation in threaded engagement with an initially unthreaded apertured workpiece and which after installation can be removed in the manner of a screw or bolt, has a shank and an enlarged head. At least part of the shank intermediate between its ends has an external screw thread having a sharp crest, and can be radially expanded to cause the thread to embed in the workpiece. A bore extends through the head and the entire shank or at least the threaded part of the shank for receiving means for expanding the shank. An end portion of the shank remote from the head may be unthreaded to avoid splitting of the shank during expansion.The method of installing the fastener involves pulling a tapered mandrel along the bore to expand the shank. The mandrel may have a key-forming head of non-circular cross-section whereby the bore of the fastener can be adopted to receive a key of non-circular cross-section for turning the fastener in the workpiece.

Abstract: A wall plug for fastening articles to hollow building materials such as panels and hollow walls, and also solid building materials, including a first end part having a longitudinal bore, a second end part having a longitudinal bore, two limbs extending at one end from the first end part and connected at another end to the second end part, the two limbs having two facing surfaces separated by a slot, and a central region having an elliptical cross-sectional profile that has a major and a minor diameter and which gradually becomes circular towards the first end part and towards the second end part, the slot having a width substantially corresponding to the difference between the major and minor diameters of the elliptical cross-sectional profile, and longitudinal ribs provided in the facing surfaces of the two limbs to provide a continuation of the longitudinal bore in the top part.

Abstract: An expanding means for removable fastening in a cylindrical hole, consisting of an elastic cylinder, which is caused by axial contraction to radially expand and with the outer surface to engage with the cylindrical hole, which cylinder is formed with a plurality of bars, which extend substantially in the axial direction of the cylinder from grooves running in the direction of the bars in the outer surface of the cylinder and radially outwardly outside the outer surface to frictionally grip the inside of the cylindrical hole so that the elastic cylinder is prevented from rotating during contraction.

Abstract: An expansion sleeve for attaching objects to a relatively thin panel comprises a hollow headed bolt threaded externally for its full length and threaded internally at an end portion remote from the head. The unthreaded internal portion of the bolt has an inwardly projecting apertured annular shoulder into which a drift pin may be driven to expand the sleeve on the interior side of a panel to which the sleeve is to be attached. A jamb nut pulls the expanded sleeve portion firmly against the inside of the panel member and thereafter a threaded rod is threaded into the interior threads of the sleeve so that a nut on the threaded rod may be tightened against the sleeve head. This draws the inner end of the sleeve toward the panel member to increase the pressure of the expanded sleeve portion against the panel. An object to be attached to the panel is then connected to the protruding end of the threaded rod.

Abstract: An insert for installation in a hole therefor in parent member comprises a body having an exterior increase in diameter between larger and smaller diameter ends and a ferrule adapted to be axially driven about the exterior of the body when the latter is end located by its larger diameter end in a hole therefor in parent material whereby the ferrule is expanded as a result of co-action with the body. The ferrule is annularly grooved to provide one or more forwardly directed portions therefrom shown of forwardly and outwardly inclined taper form at or adjacent the leading end of the ferrule and having a thin section connection therewith at the annular groove or grooves so that on axial co-action of the ferrule with the body the forwardly directed portion or portions effect radial expansion of the ferrule into taper engagement with the wall of the hole in order to lock the ferrule and body in the hole with a taper locking action against axial pull out.

Abstract: A unitary hollow plastic screw anchor which is capable of being hammered or otherwise driven into a hollow wall, with a weakened separation plane adjacent the entrance portion which is sufficiently strong to hold together during installation in the wall, and sufficiently weak to split apart when a screw is inserted into the installed anchor. Features of the anchor include a generally cross-shaped entrance end for minimal penetration resistance, a generally rectangular interior with arcuate screw centering grooves, a single turn helix adjacent the wall-engaging flange thereof to start the screw, an internal step configuration to accommodate screws of varying diameter, and two longitudinal slots which compress during installation to further reduce penetration resistance.

Abstract: There is described a substantially cylindrical screw grommet capable of accepting a threaded fastener driven obliquely with respect to the axis of the grommet, the exterior surface of the grommet being formed with axial rows of spaced barbs, the rows being separated by flutes, and the grommet being further formed with a bore which has a first cylindrical portion intermediate the length of the grommet, a first tapered portion connecting the first cylindrical portion to a second cylindrical portion of smaller diameter, and a second tapered portion of the bore diverging from the second cylindrical portion and terminating at one end of the grommet.

Abstract: The invention relates to a fixing device for securing any part to a holding member. The fixing device comprises spreadable means in a hole or bore formed in the holding member on the one hand, and on the other hand spreading means. An actuating means is provided to drive the spreading means into the spreadable means so that depending on the length of penetration of the spreading means thereinto the fixing device can be blocked on the holding member and accommodates any thickness variations of said holding member. The invention is used to secure by means of a screw or rivet any part on a holding member such as a panel.

Abstract: A plastic screw anchor for fastening fixtures and other objects to a hollow wall, the anchor including a four-legged diamond-shaped shank whose front legs are joined together by a front apex living hinge and whose rear legs are joined to the front legs by side apex living hinges, the ends of the rear legs defining a rear apex. Secured by a pair of normally outstretched resilient webs to the rear legs of the shank is a flanged socket whose bore lies in registration with an opening formed in the front apex hinge. The diamond-shaped shank is collapsible to form a tongue that is insertable in a hole drilled in the wall to accommodate the socket, the webs then reverting to their outstretched condition to cause the shank which is now behind the wall to recover its diamond formation. When a self-tapping screw is turned into the socket bore, it acts to thread the bore.

Abstract: A dowel construction for anchoring an element in a borehole, comprises, a tubular dowel of a plastic material which is insertable into the borehole and advantageously has means thereon for preventing turning movement thereof relative to the borehole. The tubular dowel has a window opening for accommodating a straddling member which is disposed in the opening between a securing bolt insertable in the dowel and the borehole. The straddling member and the bolt are constructed so that there is a wedge-engagement surface between them which causes radial outward movement of the straddling member into engagement with the borehole when the bolt is moved in a withdrawal direction. Preferably, at least two metal straddle bodies are uniformly arranged over the circumference of the bolt and they preferably have cylindrical outer surfaces which are disposed in the window cutouts of the tubular plastic cage forming the tubular dowel.