Abstract: The fixing element for anchoring in a hole drilled in a concrete part includes a threaded bolt, an expansible body with an expander cone and an expansible sleeve having an internal bore. The expansible sleeve has longitudinal slots extending from its front end and the expansible body is joined to the threaded bolt for expansion in the drilled hole. To ensure that the fixing element can continue to at least partially hold after experiencing a sever excessive stress such as occurs during an earthquake, the internal bore (14) of the expansible sleeve (11) has a first cylindrical portion (14a) in its front end, which has a length corresponding approximately to the length of the expander cone (5) and the diameter of the first cylindrical portion (14a) corresponds to the smallest expander cone diameter.

Abstract: A blind fastener for securing workpieces 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 to be 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 having an outside diameter slightly smaller than the diameter of the boreholes, and a deformable tail-part adjacent the intermediate-part and abutting and 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 fastener assembly for securing layers of roofing material to a deck includes a nut for insertion in and engagement with a pre-drilled hole in the deck and a threaded bolt for engagement with the nut. The nut is provided with resilient legs that are disposed both above and below the hole and that deflect outwardly upon being engaged by the bolt to prevent removal of the nut from the hole. The shank of the bolt is provided with a groove that engages edge portions on the nut legs to prevent counter rotation of the bolt.

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: A self-drilling plastic anchor installable in a wall by means of a screwdriver, the anchor being adapted to receive a threaded fastener that serves to hold a fixture or other object against the wall. The anchor includes an externally-threaded shank section having an enlarged head that is engageable by the screwdriver and a cavity to receive the fastener. Extending from the lower end of the shank section is a drill section that terminates in a point that lies on the longitudinal axis of the anchor. When the anchor is applied to the wall, the point penetrates its surface, so that the anchor may then be turned by the screwdriver about the point. The drill section is formed by a pair of cutting blades on opposite sides of the anchor axis and a pair of guide blades, each angled relative to a respective cutting blade.

Abstract: The utility of a cover for vents or drains is improved by having a unitary, integral fastening means which can be used to either secure the covering so securely that mutilation of the cover may be required to remove the cover or that the cover may be easily removed and replaced. The cover can be formed from any polymer with any desired surface configuration, i.e., hole size and shape, and can be used to modify existing covers or as the original cover for a hole or vent. The fastening means when integral is made of the same material as the cover and can be easily expanded and secured by pressure elements. Since the normal sleeve has been replaced by the integral fastener which is part of the cover, no relative rotation of the sleeve and pressure means can occur.

Abstract: A threaded bolt assembly adapted to be anchored in a drilled hole formed in a concrete part and having an undercut expanding towards a bottom of the drill hole, with a hardening compound mass. The threaded bolt assembly includes a threaded bolt having an internal bore extending from a leading end face of said threaded bolt and having an internal thread, and a plurality of expansible segments formed in a region of the internal bore by a plurality of longitudinally extending slots. The threaded bolt assembly further includes an expander bolt having a threaded portion threadably received within the internal bore of the threaded bolt, an expander cone extending from the threaded portion. A projection extends from an end face of the expander cone.A method for anchoring such a threaded bolt assembly in a hole with an undercut drilled in a concrete part, is also described.

Abstract: A driving-in device for fixing an anchor in a hole with an undercut and comprising a drill adapted to be received in a chuck of an impact drilling machine, and a drive-in sleeve-shaped member secured to the drill for joint rotation therewith. The drive-in sleeve-shaped member has at an end thereof remote from the end at which it is secured to the drill, a bolt portion that engages a threaded sleeve member of the anchor to screw it over a threaded portion of an expanding bolt to displace an expansible sleeve over an expander portion of the threaded bolt.

Abstract: The invention relates to a blind riveting member of the type comprising a tubular sleeve (1) and a mandrel (2) passing through said sleeve. The stem portion (5) of the tubular sleeve (1) comprises successively along its length, a first articulation zone (5a), an inclined portion (5b), a second articulation zone (5c) and an end portion (5d). These zones or portions are arranged in such a manner that the sleeve is subjected to a double folding during setting of the rivet which causes the inclined portion to expand and fold back upon itself toward the materials being assembled, forming a continuous rest surface at the periphery of the hole which contains the riveting member. The invention is applied in particular for assembling fragile materials such as composite materials. It permits providing a good vibration resistant holding for these materials without risk of damaging the same.

Abstract: A screw rivet includes a screw and a grommet. The grommet has internal steps for meshing with external threads of the screw. The internal steps are formed on the inner periphery of an expansible portion of a leg of the grommet split by axial slits, and have a staircase-like sectional profile.

Abstract: A plastic hollow wall anchor having folding arms for insertion within a limited diameter aperture in a substrate such as a wall. The arms, adjacent their overlapping attachment areas, are configured to provide a "sharp knife edge" intersection, whereby a spacing between the attached arms, during folding and aperture insertion, is substantially eliminated. The load bearing arms are concomitantly thickened and thereby strengthened within the limited dimension afforded by the aperture. Alternatively, the overall dimensions of the anchor are reduced, while maintaining the load bearing arm dimensions, thereby enabling the use of a smaller diameter for the insertion aperture without decrease in anchor holding strength.

Abstract: A device for removably retaining a fluid system component in a smooth bore comprises of body on one end of which the component is mounted and the other end of which comprises a plurality of wings. The interior of the body provides female screw threads into which an expansion member is engaged, said expansion member having male screw threads at one end and at the other end a truncated conical section. Rotation of the expansion member relative to the body causes further insertion for expansion member into the body such that the conical section causes the wing members to radially expand and engage the wall of the installation bore. The device is generally cylindrical in overall configuration with an outside diameter at least slightly less than the inside diameter of the installation bore and upon retraction of the expansion member from forcible engagement with the body, the wing members relax to their original state and the device can then be readily removed from the installation bore.

Abstract: The invention is directed to an anchoring bolt device for insertion into a material having a predrilled bore formed therein. The anchoring bolt device includes a sleeve-like body defining a longitudinal axis and having an upper portion, a mid portion and a lower portion having a bottom end face defining an opening. The body has a bore formed therein so as to extend along the axis and through the upper portion and the mid portion. A passage is formed in the lower portion of the sleeve-like body and extends from the bore and along the axis to terminate in the opening formed in the end face. The passage has a tapered inner wall surface so that the diameter of the passage becomes narrower toward the bottom end face. The lower portion of the sleeve-like body is partitioned into a plurality of legs extending in the direction of the axis. A ball is disposed in the bore so as to rest against the tapered inner wall surface and a thread is formed in the bore so as to extend along the upper portion.

Abstract: A device (24) for edge-locking printed circuit wiring boards (12, 14) within a support chassis (10) has an elongated clamping body (40) with deformable clamping strips (42, 44), one at each side of the body (40). The clamping body (40) is located on the top surface of a central wall (32) having sloping sides which is integral with a support chassis (10) cross-wall. Screws (36) on advancing into the body, (40) pull the clamping strips (42, 44) onto the central wall (32) deforming the strips into pressure contact with the wiring board (12, 13) edge portions. An alternative version substitute at least two ferrules (46) for the central wall (32).

Abstract: An expansible plug assembly that comprises a fixing bolt, and an expansible sleeve having an expansible portion and an internal thread formed in the expansible portion and engaged with the external thread of the fixing bolt, so that a reliable connection between the fixing bolt and the expansible sleeve is formed.

Abstract: A mining tool for the breaking-down of minerals, particularly coal. The mining tool includes a chisel with a chisel shaft with a receiving bore and a chisel holder with an insertion bore. The bores are in alignment when a locking bolt is driven into the bores. The locking bolt is a mandrel screw with a threaded portion which over its length includes a sharp thread and a trapezoidal thread. The circumferential surfaces of the trapezoidal thread form a driving-in cone. The mandrel screw can be easily driven into the receiving bore which includes a chuck. In addition, because of the sharp thread, the mandrel screw can be unscrewed quickly, so that a quick chisel exchange is possible.

Abstract: A plastic over-center hollow wall anchor having increased strength without increase in thickness of load bearing members and necessitation of a larger insertion aperture. The bending motion stress on the load bearing arms, which causes the weakening or failure mode of the anchor, is substantially retarded by the inclusion of a small reinforcing boss across the bending area.

Abstract: A screw anchor formed from a stamped blank. The nut has inner, outer and intermediate layers which are folded prior to rolling the nut into its final form. The inner and outer layers have a common edge and the inner layer tapers inwardly from the ends of the common edge. The formed nut exhibits tremendous strength.

Abstract: An anchoring plug comprises a plug shaft having a leading end and a trailing end as considered in direction of driving into a supporting structure, a mounting member provided on the trailing end of the plug shaft for mounting an object, an expansible sleeve, and a expander cone which is to be pulled into the expansible sleeve, the expander cone being provided with an abutment, and a sliding sleeve which is located before the expander cone as considered in the driving direction and abutting against the abutment so that the sliding sleeve is deformable by the expansible sleeve, and the expansible sleeve is displaceable onto the expander cone over the sliding sleeve.

Abstract: A blind fastener and method for making such fastener that has a flanged outer sleeve and a flanged inner sleeve that are secured together, wherein the outer sleeve has a socket that receives a lug from the inner sleeve to provide joint axial movement and wherein the outer sleeve has a plurality of slits that receives at least one radial projection from the inner sleeve to prevent rotation between sleeves. The inner sleeve has a thinner upper portion and a thicker lower portion with a score line therebetween to facilitate the separation of this portion. The inner sleeve has a central threaded bore to receive a threaded bolt for fastening purposes and to upset the outer sleeve relative to the flanged portion thereof to secure such fastener to a thin workpiece.

Abstract: An expansion dowel assembly is made up of an anchor bolt and an expansion sleeve laterally enclosing the bolt. The sleeve is expanded by driving it in the axial direction relative to the bolt so that the end of the sleeve widens as it moves axially over a conically shaped expanding member on the bolt. The axially extending surface of the expanding member is formed as a concave surface affording an increasing conicity in the driving direction. Cutting teeth are formed on the outer surface of the sleeve and provide a saw-tooth section. When the sleeve is driven relative to the bolt, the teeth cut into the surface of a borehole in a receiving material and form an undercut in the borehole surface. To facilitate expansion, an annular groove is located in the outside surface of the sleeve adjacent the cutting teeth. The annular groove is located on the opposite side of the cutting teeth from the leading end of the expansion sleeve.

Abstract: An expansion anchor assembly to be secured in a borehole is made up of an expansion sleeve and an anchor rod. The expansion sleeve has a plurality of expansion sections arranged to be deflected radially outwardly by drawing an expansion cone on the front end of the anchor rod into the sleeve. Each expansion section has a circumferentially extending weakened section forming a bending location. The weakened section is located between a radially inner and a radially outer recess in the expansion section. Each of the recesses has a rectilinear base extending tangentially relative to the expansion sleeve axis with the bases located in a plane disposed normal relative to the expansion sleeve axis.

Abstract: A plug retainer for a tube plug. The plug head and inboard end of the plug are captured by a locking cup and cap screw. The locking cup is threadably engaged in the open end of the tube plug. The cap screw shank extends through a bore in the locking cup and is threadably engaged with the mandrel in the tube plug. Compression rings on the locking cup and cap screw seal the locking cup to the tube plug and the cap screw to the locking cup to prevent leakage. The locking cup is crimped on the cap screw by the use of flutes on the cap screw head.

Abstract: A securing device of the expandable boss or grommet type, for securing a member to a support plate, has an expandable boss of a resiliently deformable material extending through the support plate. A fixing bolt extends through the expandable boss and is screwed into an expander nut, the fixing bolt having a head which bears through a head ring on the member to be secured, and the expandable boss including a shouldered head.

Abstract: A plug assembly that comprises a bolt having a cone portion at one end thereof and an external thread at another end thereof, a sleeve for mounting over the bolt and having an expansible portion at an end thereof which is adjacent to the one end of the bolt, and a tubular member screwed over the bolt until its engagement with an end of the sleeve which is remote from the expansible region for securing the plug assembly against rotation.

Abstract: An enclosed plastic screw grommet includes a head flange and a shank portion. The head flange is provided with four radially extending U-shaped slots so as to permit flexing upon insertion into a panel, thereby reducing the force needed. The shank portion includes two sets of opposed ramps formed on its outer surface and which are disposed in an offset relationship with respect to each other to thereby accommodate a variety of panel thicknesses.

Abstract: The bolt assembly comprises a traction shaft 1 with an anchoring extremity 13, an expansion ring 2 formed by means of expansible leg elements 18,19, and a brace 3 disposed around the shaft 1 and supported against a shoulder 24 provided upon the expansion elements 18, 19 in order to provoke expansion of leg portions 22, 23 with an undercut portion of an anchoring hole. The expansion elements 18, 19 extend between the shaft 1 and the brace 3 so as to give the latter a bearing surface of the same length as the legs 22, 23. The shoulder zone 24 defines an articulation region for the legs 22, 23.The bolt assembly is used for the fixing of pieces within a zone subject to tensile forces within a building material.

Abstract: A blind fastener is disclosed. The fastener comprises a tubular nut, a buckling sleeve and a mandrel. The buckling sleeve on one of its ends has a bearing face radially overhanging a facing restraint face of the tubular nut, and a tapered surface which deforms upon threaded drawing of the mandrel through the nut to approach the shape of a plane normal to the axis of the fastener.

Abstract: A pipe plug is disclosed which includes a disc-like screw plate, an elastic sealing ring, a horn-like pressure block, and a lifting eye. The screw plate receives the bottom edge of the sealing ring and the horn-like pressure block is mounted on the upper edge. The screw plate has a central rod that extends upwardly through a hole in the pressure block. The lifting eye is then threadedly received on the end of the rod and as the lifting eye is turned, the block and plate will be urged together causing the sealing ring to expand against the internal wall of a pipe.

Abstract: An expansion anchor assembly is made up of an expansion sleeve and an anchor rod. At one end, the expansion sleeve has a plurality of separate expansion parts radially deflectable about bending locations, by drawing an expansion cone on one end of the anchor rod into engagement with the expansion parts. Expansion parts can be displaced radially outwardly into a conically widened undercut in a borehole. To achieve surface area contact with the undercut, when the expansion parts are deflected outwardly, the radially inner and outer surfaces of the expansion parts are provided with a radius of curvature increasing from the bending locations to the free ends of the expansion parts.

Abstract: An expansion bolt unit includes a pull device which is fixed on an expansion tube embedded within a rigid material and has a portion which remains outside of the rigid material that is adapted to be activated by a puller to be removed from the rigid material. A bolt member extends through the expansion tube and is engaged threadably with a nut. The pull device includes one or more pull flanges extending radially and outwardly from the outer end portion of the expansion tube which remains outside of the rigid material. The bolt member has a hexagonal stub section at an outer end thereof so that a socket wrench can be engaged with the stub section. In one embodiment, a sleeving is sleeved on the bolt member between the expansion tube and the nut so that the nut can be rotated relative to the bolt member, thereby expanding the chuck jaw segments of the expansion tube by moving the bolt member relative to the expansion tube.

Abstract: A blind fastener for fastening workpieces of a crushable or composite material and which provides a blind head having a large bearing area against the adjacent blind side of the workpieces and having a main sleeve with a tapered nose and an expandable sleeve with the expandable sleeve having a primary section and a secondary section with the secondary section having a wall of reduced cross-sectional area and of a lower hardness and/or material strength than the primary section such that after the secondary section has moved past and been expanded over the tapered nose the leading end of the primary section will substantially not move radially inwardly as it is moved over the tapered nose and at a preselected axial or column load the secondary section will substantially fold or collapse to form the blind head with a large bearing area while the primary section will substantially not buckle whereby the pin can provide a visual and/or measurable indication that the fastener has been installed in a proper grip co

Abstract: A screw grommet includes a flange having a screw insertion hole and a sack-like body integral with the flange. The sack-like body is inserted through a hole formed within an object to be fastened and has an inner axial screw guide channel communicating with the screw insertion hole for receiving and guiding an inserted screw, and a plurality of hill-like portions formed upon the outer periphery thereof and projecting axially while leaving a gap between the upper end of each hill-like portion and the lower surface of the flange. The gap serves as a fulcrum point about which the hill-like portions can in effect pivot in order to generate a wedging action upon the object being fastened when the screw is inserted within the screw guide channel.

Abstract: An expansion anchor stud comprises an expansion anchor for gripping a hole in a surface, an axially-aligned, externally threaded stud of substantially the same outside diameter as the anchor and engaging the distal end of the anchor, and an axially-aligned bolt extending through a hole in the anchor and engaging the stud. A head on the proximal end of the bolt abuts the proximal end of the anchor, and external threads on the bolt engage internal threads in a hole extending through the stud. The anchor is expanded by a tool inserted into the distal end of the hole in the stud to engage the distal end of the bolt and rotate the bolt relative to the stud, thereby axially compressing, and hence expanding, the anchor. The distal end of the stud extends, in use, through a hole in a panel being mounted to the surface so that a nut may be threaded onto the external threads of the stud to secure the panel to the surface.

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: An anchoring plug for anchoring objects to a support structure includes an expansible sleeve, an expander body driven into the expansible sleeve and a screw for driving the expander body into the expansible sleeve. A ring-shaped spring member, which forms a bearing for the expansible sleeve, is positioned at the trailing end of the expansible sleeve. The spring member has the external diameter greater than that of the expansible sleeve and, may due to its properties be compressed to the external diameter of the expansible sleeve.

Abstract: An expansion dowel assembly is made up of an anchor bolt and an expansion sleeve laterally enclosing the bolt. The sleeve is expanded by driving it in the axial direction relative to the bolt so that the leading end of the sleeve widens as it moves axially over a conically shaped expanding member at the leading end of the bolt. Cutting teeth are formed on the outer surface of the sleeve at its leading end and provide a saw-tooth section. The teeth cut into the surface of a borehole in a receiving material and form an undercut in the borehole surface as the sleeve is expanded. To facilitate expansion, an annular groove is located in the inside surface of and adjoining the cutting teeth. The annular groove is spaced on the opposite side of the cutting teeth from the leading end of the expansion sleeve.

Abstract: An anchor comprising a bolt having an upper cylindrical part with an outer thread adjacent its top and a lower conical head, and a sleeve surrounding the bolt, the sleeve comprising an upper cylindrical portion and an annular expander, the expander having multiple slits therein which open to the bottom end and extend axially. The slits form expansion pieces therebetween having curvatures which, before expansion of the pieces, are substantially the same as the curvatures at the corresponding positions of the outer peripheral wall of the conical head, which the pieces contact after expansion.

Abstract: A blind fastener with an axially extending sleeve having an axially extending internally threaded passage therethrough. A head at one end has an axially facing surface thereon with a periphery which is centered on its axis. A mandrel includes an axially extending threaded shank that is threaded into and through the passage. A torque-off groove is formed on the shank. Torque tool engaging surfaces are accessible at the head end of the sleeve, and blind upsetting structure is axially movable by rotating the mandrel to form an enlarged body at the unheaded end of the sleeve. A nut is threaded to the mandrel with a bearing face facing toward the surface of the head of the sleeve. The bearing face of the nut is concavely shaped so as to make contact with and thereby to make a retention engagement with at least some points around the periphery to hold the sleeve against rotation relative to the nut when the mandrel is drawn into the sleeve with the nut pressed against the head.

Abstract: A fixing device for use in fixing insulating boards and waterproof sheeting, if required, to be fixed with the insulating boards on a sheet panel forming a cover plate for a flat roof, includes a sleeve inserted into a drilled hole extending through the waterproof sheeting, the insulating board, and the sheet panel, the lower end of the sleeve projecting beyond the sheet panel and including an expandable part which is opened out beyond the drilled hole diameter by tightening a nut on a bolt which passes through a plate or disc-like abutment element and the bore of the sleeve. The fixing device is made such that it can be detached again so that the roof covering can be repaired, renewed, and reconstructed, if required, without causing significant damage to the sheet panel.

Abstract: A cone expansion wall-plug is provided comprising a shank (1), a spacer (13) disposed about the shank, an expandable socket (4) and, at the end (5) of the shank (1), a cone (3) for expanding the socket (4). In order to be able to secure an object to be fixed against the edge of the anchorage hole formed within a supporting material for housing the wall-plug, the socket (4) includes a compressible zone (8) in the form of a bellows and bent lugs providing expansion and guiding teeth (10). The socket (4) is formed by die-stamping a metal sheet blank.

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 tool for setting threaded anchors, having an elongated body with a longitudinal bore and a threaded shaft received in the bore and projecting beyond both ends of the body to form a nut engaging end and an anchor engaging end. The anchors to be set include an anchor frustum having a longitudinal threaded bore, surrounded by a soft sleeve. A pinway is formed in the body communicating with the bore, and a retaining pin, in engagement with the threaded shaft, projects laterally through the pinway, for preventing relative rotational motion between the threaded shaft and the body while allowing relative longitudinal motion. A nut engages with the nut engaging end of the shaft. The method of setting such an anchor is to insert the anchor, attached to the end of the tool, into a hole where the anchor is to be set. The nut is then rotated with respect to the shaft, while preventing the rotation of the shaft and the body, so as to draw the frustum into the soft sleeve until the anchor is affixed within the hole.

Abstract: A blind fastener for fastening workpieces of a crushable or composite material and which provides a blind head having a large bearing area against the adjacent blind side of the workpieces and having a main sleeve and an expandable sleeve with the expandable sleeve having a reduced section or secondary portion at its leading end adapted to be severed from the remainder or primary portion of the expandable sleeve at a preselected axial or column load at which buckling has been initiated with the severed reduced section portion being substantially folded or collapsed to form the blind head with a large bearing area.

Abstract: An expansion dowel assembly includes an axially extending anchor bolt and an expansion sleeve laterally enclosing the bolt. At its leading end, the anchor bolt has an expansion cone displaceable opposite to the insertion direction of the dowel assembly relative to a conically shaped expansion region at the leading end of the sleeve. Initially, the cone angle of the expansion cone is larger than the cone angle of the expansion section of the sleeve. A circumferentially extending annular bead is located on the outer circumferential periphery of the expansion region. The expansion region is slotted in the axial direction and its wall thickness decreases in the circumferential direction toward the slots. At the outset of the sleeve expansion, it is greatly widened and the annular bead is pressed into the surface of the borehole in which the dowel assembly is inserted.

Abstract: An elongated stem extends through a bore in a sleeve having a preformed head at one end. The sleeve extends through aligned holes in one or more workpieces to be fastened together. Pulling the stem through the sleeve causes an enlarged tail on the stem to be drawn into the end of the sleeve opposite the preformed head. The sleeve thus expands, forming a blind head. The workpieces are sandwiched between the preformed head and the blind head. To prevent the stem from sliding out of the sleeve, a locking collar is provided within the sleeve bore. The collar is slideable from a first position spaced from the preformed head to a second position within the preformed head. The collar is engaged by a shoulder on the stem and is moved from the first position to the second position as the stem is pulled through the sleeve. When in the second position, the collar is prevented from further movement, and is deformed as the stem continues to advance.

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 dual expansion and non-expansion anchor comprising a pair of inner and outer expansion fasteners connected to each other by means of a screw-threaded connecting tie, said expansion fasteners being adjustable on the connecting tie to adjust to the spaced positions of an inner supporting structure and an outer supported wall. Insertion limiting means is provided to limit insertion of the inner fastener into the inner supporting structure in order to fix the position of said inner fastener in said supporting structure. Torque applying means applied to the connecting tie inserts and sets the inner fastener. Torque applying means applied to a nut on the connecting tie expands the outer expansion fastener.

Abstract: A connecting device for structured elements with an improved force fit connection, of the type comprising a bolt with a floating nut and a sleeve portion near the head. The sleeve portion is adapted to be force fitted into a first structural member, is outwardly deformable and has a plurality of circumferential ribs. The bolt widens towards the sleeve end, so that when the threaded end is rotated by means of the floating nut into a second structural member, the sleeve is expanded inside the first member and enhances the force fit connection.

Abstract: The utility of a cover for vents or drains is improved by having a unitary, integral fastening means which can be used to either secure the covering so securely that mutilation of the cover may be required to remove the cover or that the cover may be easily removed and replaced. The cover can be formed from any polymer with any desired surface configuration, i.e., hole size and shape, and can be used to modify existing covers or as the original cover for a hole or vent. The fastening means when integral is made of the same material as the cover and can be easily expanded and secured by pressure elements. Since the normal sleeve has been replaced by the integral fastener which is part of the cover, no relative rotation of the sleeve and pressure means can occur.