Abstract: A drill bit for producing drill holes with an undercut and comprising a drill bit shank, a drill bit tip mounted at an end of the drill bit shank and projecting laterally beyond the shank diameter, a rounded collar spaced from the drill bit tip and integrally formed on the drill bit shank, and a longitudinally displaceable sleeve mounted between the drill bit tip and the collar and having an internal diameter which is smaller than the diameter of the collar and the maximum width of the drill bit tip, and a method of manufacturing such a drill bit.

Abstract: An expansible plug made of a plastic material located in a drilled hole in masonry for receiving a fastening screw and comprising expansible legs having at the expansible end thereof outer notches of a reduced depth.

Abstract: An expansible sleeve storage device comprises a magazine provided with a plurality of trough-shaped holders which are arranged near one another and have elastic walls, each of the holders having at least one projection, and a plurality of expansible plugs each arranged in a respective one of the holders and having an annular groove in which the projection of a respective one of the holders engages.

Abstract: A vessel for injecting a bonding agent for anchoring a mounting element in a drilled hole comprises a housing for accommodating one component of a bonding agent and having a housing opening, an injection piston provided with an injection nozzle and displaceable in the housing, the injection piston being arranged to close off the opening of the housing, and a removable rod inserted into the injection nozzle and acting as a seal for the injection nozzle.

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 toy construction kit has an angled profiled member with two arms arranged at a an angle relative to one another and each provided with a plurality of apertures for engaging with the locking pegs of adjoining components, a substantially block-shaped adapter arranged inside the angled profiled member between the arms and fixable to the angled profiled member, the adapter having free external sides provided with connecting elements for connecting further components thereto, and elements for fixing the adapter to the angled profiled member and including a locking peg engages through a respective one of the apertures of the angled profiled member.

Abstract: The composite plug for mounting objects in holes drilled in masonry and the like comprises a plug body having a screw passage for receiving a mounting screw and an expanding region expandable by insertion of the mounting screw, the plug body being provided with outlet openings for mortar introduced into the plug body, channels forming guiding surfaces in the screw passage, the guiding surfaces leading to the outlet openings and subdividing the screw passage into a front region and a rear region, and grooves forming longitudinal channels extending along an outside of the plug body, the outlet openings merging into the logitudinal channels. The outlet openings are located in the front region and the screw passage has a portion with an increased diameter. A stopper which is insertable in the portion of the screw passage of increased diameter is provided and formed as a hollow member. The stopper has openings which are in a alignment with the outlet openings.

Abstract: An anchoring bolt including an expansion sleeve and an expander member insertable into the sleeve to expand the latter. The anchoring bolt has an inner thread at the end which faces the end face of the wall of the supporting structure to which an object is to be fastened by the anchoring bolt. A removable spacer is inserted into the borehole of the supporting structure after the anchoring bolt and is engaged with the inner thread thereof so as to determine a distance between the end of the inserted anchoring bolt and the end face of the supporting structure. This distance corresponds to the distance that the expander member is to be drawn into the expansion sleeve.

Abstract: A drilling assembly for making boreholes with undercuts comprises a housing receiving a drill receiver driven by a drilling machine, a drill, the shaft of which is connected to the drill receiver, and a sleeve-shaped centering insert protruding from the housing and surrounding the shaft of the drill with a play and having a conical portion the outer diameter of which increases towards the housing.

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

Abstract: A connector for osteosynthesis, especially for fastening bone fragments comprises a plug sleeve and a screw engageable in the plug sleeve, the plug sleeve being formed of a viscoplastic, tissue-compatible plastics and having a thread shape on its outer surface. The plug sleeve can be slightly expanded at its end facing the head of the screw and also expanded to a greater extent at its other end, so that simple assembly and firm clamping in the bone tissue is achieved. It is possible to monitor the position of the plug sleeve in the bone constantly during assembly on an X-ray screen in conjunction with a metallic screwdriver or a measuring scale provided on the screwdriver for screwing the sleeve into the bone.

Abstract: A fastener for anchoring in a bore in a bone has a screw extending along an axis and having a substantially cylindrical outer surface formed with a helical screwthread. The screw has at the screwthread a thread diameter and between the turns of the thread at the surface a root diameter smaller than the thread diameter. An anchor sleeve normally fitted in the bore and of an outside diameter corresponding generally to the diameter of the bore has an outer end formed with a laterally projecting rim normally lying against the bone around the bore, an outer end portion of an inside diameter greater than the root diameter but smaller than the thread diameter, and an inner end portion of an inside diameter smaller than the root diameter. Thus when the screw is threaded into the sleeve its thread cuts into the outer portion without substantially deforming and spreading same and into the inner portion with substantial outward deformation and spreading of same.

Abstract: A device for injecting a fixing agent for anchoring a fastening element in a drilled hole comprises a sealable container which contains one component of the fixing agent, an injection nozzle, and a plunger which can be pushed into the container. The injection nozzle is arranged on the plunger and the total length of the plunger and the injection nozzle corresponds at least to the depth of the inner space in the container. Around the injection nozzle is provided a sleeve which starts from the base of the plunger. The sleeve is filled with a further component of the fixing agent. The open end face of the sleeve is sealed by a cover having a frangible opening.

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: A fastening arrangement for a drill bell and/or suction bell provided on drills which have a stop rod mounted to the drill that it may be displaced or rigidly fixed, may be adapted to any drill equipped with the stop rod is suggested. The fastening arrangement comprises a U-shaped support which projects radially from the bell and opens towards the wall of the structure being drilled and in its base has an elongate hole. The bell may be fixed to the U-shaped support by means of a clamping member joined to the stop rod and to the U-shaped support, respectively.

Abstract: A fastening element is insertable into a hole of a structure for fastening an object to the structure and has a shaft having a forward smaller cross-sectional thickness portion, an expandable sleeve fitted over the smaller shaft portion, a holding member for holding the object at the rear end of the shaft and an expanding member for expanding the sleeve at the forward end of the shaft. The expandable sleeve is resilient and elastically deformable radially, has an external diameter larger than the maximum thickness of the shaft and has an internal diameter larger than the cross-sectional thickness of the portion of the shaft over which it is fitted. When inserted, the expandable sleeve is secured elastically against the internal wall of the drilled hole and if a tensile force is applied, the sleeve is pressed against the internal wall by the expanding member.

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 anchor for fastening in bore holes comprises an expander body driven into an expansion sleeve, having a slotted expansible portion, by a stay bolt to which a torque is applied to draw the expander body into the expansion sleeve. The expander body has at its trailing end a conical portion which merges into a concavely-curved portion. The angle of the concavity of the curved portion at the leading end of the expander body corresponds to a double angle of inclination of the conical portion to the central axis of the anchor.

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