Abstract: A plastic fastener for panels comprises in combination a main body of the shape of an angular pillar provided at the upper end thereof with a flange, elastic tongues formed one each on one of the two pairs of opposed side walls of the main body and extended from the lower side of the flange and slanted downwardly toward the interior of the main body, and fitting means formed one each on the other pair of side walls as bulged outwardly, with the aforementioned elastic tongues provided at the lower ends thereof with grips having threads incised therein. With this plastic fastener, union of a supporting panel and a supported panel is accomplished by inserting the main body into a hole bored in advance in the supporting panel until the flange thereof comes into tight contact with the supported panel and depressing a screw past the supported panel into the main body thereby causing the threads on the grips to come into fast engagement with the threads on the screw.

Abstract: A fastener comprising a male member formed of a flat base, a clipping shank provided on the underside of the base, and a pillar erected upright from the upper side of the base and provided at the leading end thereof with a head, and a female member formed of a tubular part, a pair of depressing blades raised through thin-walled hinges from the tubular part and projected parts provided at the lower ends of the depressing blades. This fastener provides the fastening of a compressible sheet such as an insulator sheet or carpet to an interior decorative panel in an automobile, for example, by having the tubular part set around the pillar of the male member with the depressing blades kept in an upright position, causing the head of the pillar to force the depressing blades down to a level position thereby bringing the projected parts into fast engagement with the underside of the head of the pillar and nipping the compressible sheet fast in position between the male member and the female member.

Abstract: An anchoring retainer is mounted in a blind hole in a concrete floor or wall. The retainer, adapted to be used with a threaded element, comprises a flexible unitary one-piece body made from a plastic material. The body has an axis, is of generally triangular configuration and has at the apex thereof a sleeve provided with an opening surrounding the axis through which the threaded element extends. The sleeve has a pair of integrally formed outwardly diverging elongated flexible legs. An elongated flexible strut of V-shape is spaced axially from the sleeve and includes a central strut portion located beneath and spaced from the sleeve along with a pair of outwardly diverging strut portions which are integrally connected to the central strut portion and to the flexible legs near the outer ends thereof. In use, the sleeve end of the retainer is inserted into the blind hole, with the free ends of the legs near the open end of the blind hole.

Abstract: A mining bit to be mounted for rotation in a bore of a support block or on a drill steel having a retention configuration opposite the working end. A bit shank is formed with an abutment flange at the insertion end and a recess adjacent said flange to receive flexed resilient fingers of a resilient retention ring during insertion of said ring in said bore. A fulcrum land supports an unsplit end of said ring. The resilient fingers carry an annular bulge projection which engages an annular recess in a support bore. The ring can extend the length of the retention shank to serve as a wear sleeve. With a drill steel, the retention ring is mounted on an extending insert to cooperate with a female recess in a hollow bit.

Abstract: The disclosure relates to a blind plastic rivet having a fully polymerized head and shear portion and a partially polymerized head forming portion. The head forming portion is deformed upon heating due to tensioning of a centrally disposed mandrel thereby to form a blind rivet having a fully polymerized blind head.

Abstract: Expansion dowels for use in slabs, masonry and similar structural components having a face surface and a hollow space inwardly of the face surface so that the dowel can be inserted through the face surface into the hollow space. The dowel has a shaft part which extends through the face surface into the hollow space. Expansion arms are flexibly articulated to the shaft part and are located in the hollow space when the dowel is inserted. Support levers are flexibly articulated to the expansion arms and are interconnected by a link. The support levers are also located within the hollow space when the dowel is fully inserted. The expansion arms and support levers can be angularly displaced between an insert position so that the dowel can be inserted into the hollow space and an expansion position for holding the dowel in the inserted position. Releasable stops are provided for securing the expansion arms and support levers in the insert position.

Abstract: A one-piece self-retaining threaded plastic screw grommet including a head and bifurcated shank having a through bore through the head and shank. The slots which bifurcate said shank being generally tangentially disposed on opposite sides of the axis of said bore and the free end of said legs being interconnected by non-linear bendable web means that restrain the spreading of the legs when a complimentary screw is inserted within the bore.

Abstract: At anchoring in concrete, plugs and/or expanders are used; which require relatively deep holes for providing the strength required. In order to reduce the necessary hole depth without deteriorating the strength, and in general to facilitate and render cheaper the anchoring in concrete and other hard material, the present tensile force absorbing anchoring comprises an anchoring member formed integral of steel wire, with an anchoring portion located in a hole in the material, which portion comprises two gripping members, each with a free end engaging with the hole wall. The members are formed integral, with each of their two shanks abutting an opposed side of the hole wall against the engaging surface of the free end of the respective gripping member and extending axially out of the hole.

Abstract: A device for detachably fastening an element having a first aperture onto a support panel of a motor vehicle having a second aperture. The device includes a bushing insertable into the second aperture, which bushing includes an exterior flange and resilient legs which cooperate to fix the bushing to the support member. The device further includes a plug which is insertable through the first aperture and into the bushing. The plug has a conically tapered bulge which cooperates with an elastic constriction in the bushing to fix the plug relative to the bushing and therefore the element relative to the support panel.

Abstract: A device to secure an ornament or fixture to the surface of a panelled wall which device is inserted, made immobile and is easily removed from a surface-to-surface boring in the wall, characterized by a multi-part, longitudinally collapsible shaft with anchoring socket, the die-cut, weakened sides of which, when fitted into the wall and when driven clockwise at its tapered threaded base by a removable screw, compress and widen under the force generated by the screw to expand and tighten against the interior surface of the wall furthest from the point of insertion thereby preventing movement of the socket when it is located inside the wall boring, having also the means for removal by the introduction of a rigid insert of a length to reach the tapered, compressed section of the multi-part shaft so that separation of the expanded section of the shaft from the unexpanded section of the shaft occurs when the protruding end of the insert is struck with sufficient force to unsnap the parts of the shaft and the expan

Abstract: An anchoring retainer is provided for mounting at one side of a supporting structure such as a wall or ceiling having a through or restrictive opening therein through which the retainer is first inserted to reach one side of the structure or for mounting in a blind hole in a concrete floor or wall. Generally the same retainer may be used with a through opening or blind hole. The retainer, adapted to be used with a threaded element, comprises a flexible unitary one-piece body made from a plastic material. The body has an axis, is of generally triangular configuration and has at the apex thereof a sleeve provided with an opening surrounding the axis through which the threaded element extends. The sleeve has a pair of integrally formed outwardly diverging elongated flexible legs.

Abstract: A fastening device comprises a fastening base and a wedge member and is capable of ensuring fast engagement of an engaging leg with a panel by inserting the engaging leg in a hole formed in the panel and driving the wedge member into an insertion hole formed inside the engaging leg thereby expanding the engaging leg inside the hole of the panel and is also capable of readily releasing the engaging leg from the fast engagement with the panel by pulling out the driven wedge member.

Abstract: An anchoring retainer is provided for mounting at one side of a supporting structure such as a wall or ceiling having a through or restrictive opening therein through which the retainer is first inserted to reach one side of the structure or for mounting in a blind hole in a concrete floor or wall. Generally the same retainer may be used with a through opening or blind hole. The retainer, adapted to be used with a threaded element, comprises a flexible unitary one-piece body made from a plastic material. The body has an axis, is of generally triangular configuration and has at the apex thereof a sleeve provided with an opening surrounding the axis through which the threaded element extends. The sleeve has a pair of integrally formed outwardly diverging elongated flexible legs.

Abstract: A one-piece, plastic fastener for lockable engagement in an opening in a panel, comprising a stem having an inner and an outer end. A pair of legs is formed integrally with and extends from the inner end, the legs being in parallelism with one another and in general axial alignment with the stem. Each of the legs has integrally formed therewith at a juncture an elongated arm positioned at an acute angle relative to its leg. The arms each have a free end which terminates in an integrally formed head portion, and the head portions are cooperatively engageable with one another and swingable about the juncture and with their respective arm towards one another to form a complete head having an orifice embracing the stem. The stem and arms are drivable into the opening in the panel to locate the head against an outer side of the panel. Serration means are provided between the head and the stem to maintain the fastener in lockable engagement with the panel.

Abstract: In combination with a structural component, an improved self-retaining, non-metallic, molded bushing suitable for use in close tolerance applications--viz., applications where the inside and/or the outside diameters of the bushing must be maintained within .+-.0.005" and, in many instances, within .+-.0.002". More particularly, a self-retaining, non-metallic, close tolerance molded bushing having: (i) a tubular body portion with an outside diameter D.sub.1 ; (ii) an integral, enlarged, premolded first retaining head at one end of the tubular body portion; (iii) the tubular body portion having an axially extending area of reduced wall thickness at its opposite end terminating in an outwardly flared extremity having an outside diameter D.sub.2 (where D.sub.2 is greater than D.sub.

Abstract: The tension head comprises essentially a sleeve with a threaded bore having opposed keyways extending therethrough. In those keyways is supported a U-shaped stop member. When the sleeve is turned up on the end of the bolt protruding from the hole until that end abuts the cross piece of the stop member, rotation of the sleeve rotates the bolt. When the inner end of the bolt is bonded to the rock, further rotation of the sleeve causes the stop member to break or deform. The lower end of the bolt pushes the deformed stop member or its fragments out through the bottom of the sleeve along the keyways.

Abstract: A device for fixing members to panels, or joining panels, which has a body moulded from a resilient plastic, comprising a head part and a tail part joined by strip-like connectors which distort when the tail part is pulled towards the head part, and including outwardly deflected wings displaceable inwards to allow the fixing device to be applied.

Abstract: Mine roof bolting using an anchoring fastener comprising a bolt having a head at one end and screw-threaded at said one end, and a nut threaded on the bolt engageable with the head. On turning the nut in one direction, it moves along the bolt away from the head. On turning the nut in the other direction, it moves toward the head until it engages the head, at which point further rotation of the nut in said other direction turns the bolt in that direction.

Abstract: A blind spring clip fastener for insertion in a round hole in a work piece has a head portion and a shank portion extending perpendicular to the head portion. The shank portion comprises a pair of spaced-apart mirror image sections extending from opposite side edges of the head portion, each section including a resilient leg and a pair of wings integral with the free ends of the leg and extending toward the head portion at opposite side edges of the leg. Each wing is shaped so that it has a side edge extending upwardly-outwardly beyond the plane of its leg and a free end extending from a point beyond the plane of the associated leg relatively steeply upwardly-inwardly toward the head portion.

Abstract: An expansion dowel for insertion through an opening in a structural member into a hollow space within the structural member, is formed of a shaft portion, a pair of expansion arms connected to the shaft portion and a pair of webs, each joined to one of the expansion arms and connected to one another. In the inserting position, the expansion arms and webs are folded inwardly and extend along the projection of the axis of the shaft portion. When the dowel is displaced into the expansion position, the expansion arms extend approximately perpendicularly to the axis of the shaft portion and each web is disposed at an acute angle to the expansion arm to which it is joined.

Abstract: The disclosed structure is for mounting an element to a body, comprising a through hole bored on one of the body and element, a mounting hole bored on the remaining one thereof, and a unitary clip detachably engaging said through and mounting holes, said clip having a holding portion engageable in said through hole, and said through hole having a guide means for twisting said holding portion as the holding portion is inserted in the through hole but releasing said twist upon complete insertion of the holding portion into the through hole.

Abstract: An arrangement for mounting an object to a support structure has a mounting element insertable into a mounting hole of the support structure, a flexible container arranged to accommodate an adhesive substance and to be inserted into the mounting hole prior to the mounting element, and an abutment member arranged to abut against an outer face of the support structure and provided with the slot. When the flexible container inserted in the mounting hole is pulled out from the latter and through the slot of the abutment member the adhesive substance is squeezed from the container into the mounting hole so as to anchor the mounting element insertable into the hole.

Abstract: The invention relates to a one-piece plastics fastener for positively fastening an element to a support, permitting removal of such element while the fastener is self-retained thereon.The subject fastener of this invention is so devised as to enable it if necessary to be mounted on the element to be fastened prior to mounting of the two together on the support, which is important in the event of assembly-line operations.

Abstract: An elongated shaft assembly is provided including first and second end portions and the first end portion includes a non-circular end for rupturing and mixing, upon rotation of the first end portion, a resin capsule seated in a bore into which the first end portion is inserted. The second end portion of the shaft assembly includes a diametrically reduced externally threaded terminal end and a conical shoulder merges the threaded terminal end with the larger diameter section of the second end portion. Radially expandable and circumferentially rupturable sleeve structure is slidingly disposed on the diametrically reduced end portion for advancement toward and engagement with the conical shoulder for expanding and circumferentially rupturing the sleeve structure and an apertured roof plate is slidable on the diametrically reduced terminal end, thrust structure being threaded on the diametrically reduced terminal end and engageable with the sleeve structure for applying axial thrust thereto.

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: An anchor assembly includes an anchor bolt or stud and an adhesive material for securing the bolt in a prepared borehole. The adhesive material consists of at least two required components which, when mixed together, harden to fix the bolt within the borehole. Of the two required components, one is located within a cartridge and the other is placed on the shank of the anchor bolt and can be enclosed within a destructible sheath. By driving the bolt into the cartridge the components are mixed. Either a mixture promoting material can be included in the cartridge or mixture promoting members can be associated with it to assure the component is stripped from the bolt and adequately mixed with the component in the cartridge.

Abstract: A fastener for use with a connecting element such as a screw comprises a thickened head of a firm but plastic material, a shank, and a tail. The head and shank are first placed into a hole; then a connecting element such as a screw is inserted alongside of the head to cause the head to wedge into the wall of the hole and hold the screw tightly. In one aspect the shank and tail are connected by an indented portion that facilitates breaking away the tail and indicates the desired depth of insertion of the head, and in another aspect the head contains a second, harder material to facilitate the wedging action of the head.

Abstract: An improved device for interconnecting a pair of different parts together, such as the fastening of a pitot tube to the side wall of an air flow duct of an air conditioning system. The device includes a barrel having a number of resilient legs mounted thereon near one end thereof, the barrel being externally threaded to receive a hex nut or the like. The legs, which initially project laterally from the barrel, are movable into positions extending longitudinally of and adjacent to the barrel as the barrel and legs are inserted into a hole in a second part. The legs spring back after passing through the hole and the outer ends of the legs engage the surface portion surrounding the hole when the nut is tightened on the barrel so that the first part carried by the barrel is effectively rigidly connected to the second part having the hole.