DE8405120U1 - Expansion anchor - Google Patents

Description

Approved by the Europk ^ chen Ptet - admitted to lh · European Patent Office - Mandataire aggrfö aupres l'Offie · Europeen des Brevet »

AIf ons Knoche Overbergstr. 7 5758 Fröndenberg fj

Expansion anchor

The invention relates to an expansion dowel according to the preamble of the main claim.

Expansion dowels of this type for attaching, for example, a plastic window frame to a building wall are known (DE-OS 32 08 266).

It is the object of the invention to develop and improve an expansion dowel of this type in such a way that, on the one hand, a better fit of the sheet metal sleeve is guaranteed both in the component to be fastened and in the structure and on the other hand a simple and yet dimensionally accurate manufacture of the sheet metal sleeve is also possible.

This task is based on an expansion anchor according to the preamble of the main claim by its characterizing Features solved. Advantageous further developments result from the subclaims.

The radially protruding claws provided on the upper edge of the sleeve prevent the dowel from slipping through the hole in the component to be fastened, for example a plastic window frame. The claws claw rather already when inserting the dowel in the | Kunet & toffmaterial the component and it becomes'! {

prevents the dowel from turning when it is tightened. It is particularly advantageous to use the one provided on the edge of the sleeve To close the slots with appropriate webs, so that when the dowel is hammered in, the edge of the sleeve is retains its original shape and is not compressed. This allows the claws to stick even more firmly into the plastic are pressed in and the anchor is prevented from slipping through with certainty. The spacing assembly of the component, for which such expansion dowels are primarily intended, is due to the functional interaction of the claws with the additional ones provided on the dowel! Rastvorsprüngai essential improved and safer, because the plastic material of the component is made essential by the claws anchored more firmly to the dowel.

The additional claws according to the invention are preferably simple triangular profile features on the top Sheet metal sleeve edge »according to a further development of the invention, however, they can also extend outwardly in a flange-like manner Segments be expanded, which in the inserted state of the anchor flat on the edge of the mounting hole of the component.

It has also proven to be advantageous -the at a distance the thickness of the component to be fastened below the sleeve edge provided locking projections, which can be formed in a known manner as taachen-shaped impressions in the sleeve wall, as inclined and outside step-shaped grooves, through the outer profile of which the dowel is even more solid in the structure to be fastened part can be pinched. Preferably there are also additional oppositely inclined positions in between outside staircase-shaped forms provided.

In the mass production of sheet metal sleeves bent from sheet steel For expansion dowels of this type, it is important to use a subsequent tool when winding the sleeve on a flat sheet metal part Manufacture as exactly cylindrical as possible, so that the borehole is made with the least possible oversize must become. With the usual ones. This is difficult to achieve with sheet metal sleeves. The drill holes, for example, for one 10 mm dowels (outside diameter) therefore had to be set with an oversize of 10.5 mm, for example.

With the claws according to the invention, it is ensured that the dowel does not slip through the borehole in the component and that the dowel does not rotate when the screw is tightened, even with such upper dimensions of the bore. According to a further development of the invention, however, it has proven to be advantageous in the sense of subclaim 12 to design the lower expansion zone so that the sleeve can always be made exactly cylindrical in a subsequent tool with uniform tolerance even from relatively thick sheet metal blanks. This is achieved in that at least some of the downwardly protruding dumbbell flaps are connected to one another at the lower edge by webs, so the unbent sheet metal blank is also contiguous in this lower area. In the subsequent tool, this lower part of the sleeve can also be bent into a cylinder much more precisely than is the case with freely protruding dumbbell flaps. The division of the width of the lower jacket slots and their connection by webs is selected according to these improved manufacturing options, the more this lower part of the sleeve is closed at the edge, the more precisely cylindrical the sleeve can be made. On the other hand, these additional webs must not restrict the spreading property of the lower spreading zone too much. Dec web may optionally be formed as a predetermined breaking point and up to the tightening of the clamping screw

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i tear. After this bridge but according to a further training

I of the invention at the same time as protection against loss

i fvx the expanding nut is used, it is advantageous to

i sung this ridge to the lower weight cloth to be chosen so

* ,. 5 that this does not tear - this is possible if the

\ permanent free lobes one third of the total circumference of the

The sleeve and the interconnected by the web

'' Put a rag the remaining two thirds of the circumference. At the-

The footbridge can remain in this division and it still becomes a

jg 10 secure and centric seating of the anchor in the drill hole

I ensures.

% This is possible due to the formation of the lower expansion zone

precise manufacture of the anchor makes it possible that the

'15 The borehole is drilled without being excessively large. So is , also a much tighter fit of such a dowel in the

Component and in the masonry guaranteed. The inventive design of the bottom expansion zone is indeed particularly advantageous in combination with the upper edge of the sheet metal (20 sleeve provided claws, since by the functional together Ip ^ nenwirken these two Hass names for the first time a dowel is provided that a very good and firm Guaranteed seat, which above all makes it possible to optimally meet the recently required high demands on the fastening of plastic window frames in order to improve the thermal insulation properties thus ensuring a better anchor seat, also be applied for custody without these 30 upper clip because they see only a * much better anchor seat compared to known Dtibelkonstruktionezi guarantees leg insertion of inventions' dung according anchor is not Aneefcen the anchor at the ^Mon-.: fear of day drilling / like the »with the previously beJc & nn-

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ten and not so precisely manufacturable sheet dowel structures with protruding SehlitarMndesfi of the Pail let and a According to the invention, dowels can therefore also be used in a much simpler and more precise manner. 9

The possibility created by these additional webs for the protection against loss of the expansion nut, there is the additional advantage that the loss piercing nose of the expansion nut, which is supported on this web, is initially the upper edge of the bush is relieved of the pressure of the screw head and the screw head can therefore certainly not initially widen the opening of the sleeve. This becomes a additional protection against impact achieved for the dowel.

The dumbbell lobes of the lower expansion zone are preferred different lengths and formed on the expanding nut are preferably formed correspondingly associated cam sections, which are shaped so that when tightening the Screw the flaps of different lengths evenly be expanded. The dumbbell that is not connected to the other tabs by a bar becomes relative be turned out quickly and so right from the start anchor the dowel firmly in the drill hole. This quickly prevents the dowel from rotating in the drill hole enough. The additional cams on the outside of the Expanding nuts also serve to center the nut with regard to the sleeve, which has lobes protruding in the lower area of different lengths. With that one will always 'Middle insertion of the anchor in the drill hole guaranteed. Ii -

Semäss the invention is the first time ice expansion anchor with a j created from a sheet metal part formed sheet metal sleeve, the ei **;

new secure fit of the BBbels in the building taao in the component to be fastened ensures that it can be seen for the first time,

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£ provide iis a 10niin-Düb "l äüöh eta 1Omm-Behsloeh. This narrower borehole, which is possible for the first time, enables optimal holding values and, in addition, an indunfsgein & eeer dowel can be produced very easily and cheaply in a subsequent tool in mass production from appropriately pre-cut bleeh parts.

An expansion dowel according to the invention also makes it possible for the first time a so-called blind assembly of a plastic window frame " to masonry / i.e. the dowel can go through a corresponding hole in the profile of a plastic window frame like this be inserted into the profile chamber of the window frame so that the screw head is not visible from the outside Profile surface is applied. This is the first time with an invention according to expansion head dowel possible, as only this one be ensures a secure fit of the dowel in the masonry as soon as it is inserted and also prevents the BUbel through the drill hole in the profile frame to be attached slips or turns when tightening. Only then

2Oi such a blind assembly is possible, in which the seat of the dowel head can no longer be observed by the user when screwing in, this first time with a dowel according to the invention wögiiehe blind installation of a window frame also ensures a much better fit and he ' fills the required Warstedämmeigensehaffcen much better, because the dowel head is no longer as before attacks the outer plastic profile of the flag but can be set in such a way that it aegrelft in the sheet metal profile of the window frame seen in the frame a better skindrack enables, also is at This possible type of mounting to the outside aar noeh ice drill hole, the profile frame is visible / what is suitable through iron Substances can be sealed.

The finding is explained in more detail below with the aid of visualized drawings of execution fog games.

Fig. 1 shows you a side view of the invention S expansion anchor

Fig. 2 shows the corresponding sectional view along the line A-B ffig. 3 shows the development of the Bleoh part / from which the in Plg.1 shown sheet metal sleeve is bent / in assignment see below the Moeken also shown in the settlement of the spread mother

4 shows the corresponding section along the line A-B according to Fig. 3

5 shows the initial widening in a sectional view the lower expansion zone

Fig.6-8 show further possibilities for the formation of the Latching protrusions on the bleoh case

Fig. 0-11 show further possibilities for the design of the upper edge of the sleeve on the basis of sectional images FIG. 12 shows the use of a spreading device according to the invention dowels for blind installation of a window frame profile

I am an expansion dowel according to the invention for fastening Plastic window frame 1 on a masonry 2 consists of a sheet metal sleeve 3 made of sheet steel and a screw bolt

ti »4, which is supported with its head S on the upper sand of the sleeve 3 and whose expansion nut 7 screwed onto the threaded end 6 acts with the lower expansion zone 8 of the sleeve 3 2U ~ eaanaea, W & t upper sand of the sleeve 3 and the associated fabric S des Sehraubbolzess 4 is preferably according to Pateat anmel & ffig ".P 32 OS 266 executed.

The sleeve 3 is flat from one of la Fig.3 shown bent to a follow-on tool. At the top

des Bleehä & seaaittes siad triangular beads 9 aas-

underneath eiwa at the distance of the material ceiling of the 1 Ausätzliehe Raetvessprünga 10. Between dan RastvoirSprüngen 10 1st a straight on the edge by one Stag 11 closed slot 12 designed. Laterally on Two sehmal lobes 13 and 14 are provided on the upper edge. The lower expansion zone is formed by three jacket flaps 15, 16 and 17 formed, the two lobes 1S and 16 through a slot 19 closed at the bottom via a web 18 are separated from one another and the tabs 16 and 17 duroh one Slit 20 open at the bottom. The flap 17 is axially somewhat longer than the two flaps 15 and 16. The lower edge 21 of the mantle flap 17 is cut p & il-shaped, as is the lower end 22 of the mantle section formed by the two flaps 15 and 16 connected to one another. the The length of the slot 19 is preferably selected to be somewhat greater than that of the slot 20. On the tabs 15, 16 and 17 anti-rotation locks are formed in each case, namely in the form of lengthways 23 and transverse crosses 24 * In the area between the locking projections 10 and the

In the lower expansion zone 8, additional twisting indentations 25 in the form of corresponding characteristics are preferably provided.

When winding a Bleehzuschnittes according to Figure 3 in a 2B suitable progressive die a zylinderische sleeve 3, in which the two tabs 13 and 14 abut one another and Aefi ^e öehliessend a continuous longitudinal slot 26 form / which is open in the bottom expansion zone 8 and only the top is formed by the opposing flaps 13 and 14 are closed. You Ausg 9 protrude radially outwards and form claws, which you see when inserting the dowel firmly dig into the material of the component 1 to be fastened. The box projections 10, which are pronounced outwards in the same direction, form the support for the underside of component 1. As the tabs

15 and 16 are connected to one another by the web 18, the sleeve in the follow-up tool can also be shaped to be exactly cylindrical in the lower region of the expansion zone. It only two protruding tabs are provided, which makes it much easier to manufacture the sleeve in an exactly cylindrical manner is possible than is the case with three or more protruding individual lobes.

On the circumference of the expanding nut 7, in addition to the guide web 30, which is guided in the continuous longitudinal slot of the sleeve, cams 31 to 34 are formed, and in the sense of FIG and 33 are assigned to the two jacket tabs 15 and 16 approximately in the middle, the cam 32 to the web 18 and the cam 34 to the individual jacket tab 17. The profile of these cams 31 to 34 and their height and position on the jacket surface of the expanding nut 7 is as follows selected so that when the screw is tightened and thus the expanding nut 7 is drawn in, the associated jacket flaps 15, 16, 17 are expanded evenly. The cams 31 to 34 we-. ken at the same time as a centering for the nut in the sleeve, which is not straight on the lower sand.

Above the cam 32, a nose 35 is also formed on the circumference of the conical expanding nut 7, which fits into the slot 19 and serves as a protection against loss for the expanding nut. The nose 35 comes to rest on the web 18 and this prevents the nut 7 from falling out.

Fig. 5 shows the insertion of an expansion dowel according to the invention into a corresponding wall hole for fastening a plastic frame 1. When the dowel is hammered in with the hammer, the claws are drilled (the locking protrusions 10 can ventilate the seat braid 12, 26 while springing radially inward) 9 sunk into the material of the window frame 1 at the edge of the hole, the dowel

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thus claws firmly in the material 1 and is thus secured against twisting. The sheet metal sleeve 3 can protrude a few tenths of a millimeter above the surface of the component 1, but cannot slip through the hole in the component because the claws protrude radially outward and also prevent this slip. When the screw is tightened with a screwdriver, the lower expansion zone 8 is expanded by the expansion nut 7, and initially the longer jacket tab 17, which is not connected to the other jacket tabs and is relatively narrow, is initially somewhat stronger via the cam spread open and so the dowel seeped into the masonry against twisting. This anti-twist protection is reinforced by the longitudinal and transverse beads 23, 24 and also by the additional impressions 25. When the expanding nut 7 is drawn in further, the somewhat more rigid jacket flaps 15 and 16 connected to one another via the web 18 are then expanded. If the lower expansion zone 8 is firmly anchored in the masonry, the screw head 5 also acts on the edge of the sleeve and sinks the sleeve edge in the component to be fastened, whereby with a suitable design of the underside of the screw head, the sleeve widened accordingly at the edge and so firmly in the Hole of the component is anchored.

6 shows in a plan view of a sheet metal blank another possibility for the formation of the locking projections 10, 7 and 8 show the associated sectional images. After this Further training consist of the locking projections after the one The dowels come to rest on the underside of the component to be fastened, from embossments 36 which are step-shaped on their outside and thus sit in claw-shaped elongated grooves, as the sectional view according to FIG. 7 shows. These expressions Bind bo designed, Ομλμ them ....

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have an outer surface inclined at the angle α with the highest point up towards the edge of the case. This externally serrated formation of the locking projections 36 ensures an even better and more secure fit of the dowel in the component to be fastened, as it does so the dowel can also attack other parts of the component to be fastened and become wedged there. Particularly It is advantageous here between the locking projections Acting expressions 36 also provide further expressions 37, which are reversed in the sense of the sectional view according to Fig. 8 Have slope (angle ß). Finally, FIG. 6 also shows how the claws 9 form a flange-like segment 38 can be bent.

The number of claws 9 and also the number of associated latching projections 10 or 36, 37 depends on the respective purpose of the anchor and its diameter. Preferably, there are white radially opposite locking projections 10 and, for example, symmetrically to this and offset at an angle to it, four claws 9 evenly distributed over the circumference of the sleeve, as the exemplary embodiment shows. Naturally, more or less distributed claws can just as well be provided on the edge of the sleeve. Pie claws 9 protrude only a few millimeters beyond the circumference of the sleeve, they are selected to be about as high as the locking projections 10. This height of the claws 9 also depends on the particular application. Since the dowel according to the invention can be inserted into a borehole of less oversize, which is due to the special design of the expansion zone 8, the claws 9 do not need to have an excessively large radial height in order to fulfill their function.

9 shows the possibility of using a sectional image Extension of the claws 9 to form flaneeh-like segments 38 /.

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as already indicated in Fig.6. This flange-like Outwardly protruding segments 38 lie flat on the upper side of the component 1 and thus prevent a Slipping through of the dowel. The beads 39 of the claws 9 formed on the inside of the sleeve are preferably sufficient up to about the beginning of the Ilast projections 10.

10 shows a further embodiment for the extension of the claws 9 to flat outwardly protruding flanges 40, in which case a flat 2 <ompetite screw head 41 can be used, whereby the screw is fully countersunk in the sleeve 3 .. Fig. 11 shows Another possibility for such a flange design, in which case additional ones on the inside of the sleeve Projections 42 are worked out of the sleeve material by cold forming, which project radially inward and serve as a support and impact protection for the screw head 43. The screw head 43, which is a countersunk head is formed, has in addition to its conical surfaces a circumferential step edge 44, which when inserted Screw on the projections 42 comes to rest while the Sloping surfaces of the underside of the screw head the sleeve expand accordingly.

FIG. 12 shows the possibility of blind installation of a window frame profile 1 on a masonry 2 by means of an expansion dowel according to the invention. First, an assembly opening 51 is drilled into the frame profile, the diameter of which is selected to be somewhat larger than the diameter of the screw head. The actual mounting hole is then made into the masonry in the profile material underneath, consisting of the plastic frame part 52 and the metal frame profile, which is usually used as reinforcement . Then an expansion plug according to the invention is used

used; at which siehergeetelAt he dtaroh sees the assembly hole in the ropes 52 / S3 but is even additionally calibrated against twisting by the protruding claws. The additional protrusions 36/37 can claw into the profile material as if they were sloping and contribute to the good fit of the pedestal can happen on this metal part with a slightly larger pressure, the mentage opening 51 is waeeerdisht vereohloeeen by means of a suitable plug 54.

Claims (1)

· .. ··. »· · .. '.: ·. · .. '.'. D-80Q0 Müncher »80 Patent attorney DipK-Ing. Walter Graf r, wL £ «« » ¹ ^ - Telex 523703 (mtd) Port «*» * Munich I DMitsdw Bank Munich SMB 797 approved by the European Patent Office - admitted to "" European Patent Office - Mandatair "aggttt aupras lOffic" Europeans "des Bravais A-431 Protection claims 1.Expanding dowel for attaching a component, in particular a plastic window frame, to a structure, consisting of a slotted sheet metal sleeve and an inserted screw bolt, the head of which with the above The outer sleeve girand cooperates and on its end of the mind an expanding nut which interacts with the lower expansion zone of the sheet metal sleeve is screwed on, characterized in that a plurality of sleeve edges interacting radially with the screw head (5) are located on the upper sleeve edge claws (9) which protrude from the sea and are distributed over the circumference of the sleeve are formed. 2. Dowel according to claim T, in which below the sleeve edge in about the thickness of the building to be fastened partially corresponding distance radially outwardly protruding locking projections are formed / thereby characterized in that the claws (9) are about the same height radially as these locking projections (10) are trained. 3. Dowel according to claim 1 or 2, characterized in that the claws (9) are angularly offset on the circumference of the sleeve with respect to the locking projections (10). I 114 * 11 I 4 I III Il II " «I j, 11.41Il. I. ** .. **. ¹ II * 4. Dowel according to one of the preceding claims, characterized characterized in that the claws (9) in the form of triangular profile features from the Sheet metal material of the sleeve (3) are formed. 5. Dowel according to claim 4, characterized in that " that the embossed beads of the claws (9) formed on the inside of the sleeve extend axially approximately to the beginning the locking projections (10) extend. 6. Dowel according to one / ym of the preceding claims, in which the sheet metal sleeve in the upper, interacting with the screw head Area has at least two longitudinal slots distributed over the sleeve groove, characterized in that that the longitudinal slots (12, 26) on the sleeve edge are closed by a web (11, 13, 14) are. 7. Dowel according to claim 6, the sheet metal sleeve of which has a longitudinal slot extending over the entire length, formed by the abutting longitudinal edges of a wound sheet metal strip , characterized in that the web closing this slot (26) by at least one d «R longitudinal edges of the sheet metal strip (3) protruding tabs (13,14) is formed. 8. Dowel according to claim 6 or 7, characterized in that aia the axial width of the webs (11 / : 13.14> approximately the material thickness of the construction to be fastened partly corresponds to (1). 9 «Pübel according to one of the preceding claims / characterized g e k β η η a β leans / that the claws elw radially to the outside see segments extending like a flange (38) 5 to. are designed to conduct flash in the stent state • ι the sand of the assembly drilling of the building to be fastened 1 parts «(1) rest. I. 11th Dowel according to one of the preceding claims, characterized in that I 10 marked, daoe the locking projections L inclined, outside stair-shaped embossments (36,37) are. I. Dowel according to Claim 10, characterized in that it is marked net that between the above furthest radial forward ™ jumping outside step-shaped locking features 15th (36) additional diagonally opposite, 12th outside also tce $ pea £ $ saige features (37) marked forms are (Figures 6, 7 and 8) Dowels, tos especially according to one of the preceding claims 20th che 1 to .11, in which the lower one is attached to the expanding nut arranged expansion zone at least three through longitudinal slits has formed jacket lobes, thereby g e k e η η 13th draws that at least two of the mantle lobes 25th (15,16) on the lower edge of the sleeve (3) through a sehma len web (18) are connected to one another, ν Dowel »according to claim 12, thereby g e k en η ζ e i e h - * net that the man who is not connected to a walkway shower 30th 14th plate flaps (17) is axially longer than that Mantetlap connected to one another by a web (18) " gen 415,16) & over-.siach claim 12 or 13, characterized thereby draws that the through the over eiaem bridge (18) Maatellappen (15,16) ge Formed the sleeve shape at least twice as fast as of the single flap (17). • 4 15. Dowel nash claim 12 to 14 / characterized / that the lower expansion zone nozzles three Manfceliappen (15, 16/17) of approximately the same width are formed and two dithered lobes (15, 16) on the lower hand a web (18) are connected to one another. 1) 6. Dowel according to one of claims 12 to 15, characterized in that the with each other Connected dumbbell flap Π5.1 $) formed Htilsenabschnitt and / or the individual jacket flap (17) at the bottom The sand is cut in a triangular shape to a point (tips 21.22). 17 dowel according to one of the preceding claims 12 to 16, characterized in that the through a web (18) closed slot (19) of the lower SpreisBone (β) is axially longer than the blind bar (20). 18. Dowel to one of the. previous »claims 12 to 17, characterized in that the jacket flaps (15, f6, 17) · outside, with additional anchorage claws (23, 24). provided siad. 2S 19 * * dowels according to Aaepruch ffi, 'thereby geke-ftftzeieh ^ net that the claws are formed by pronounced XiSags- and Quereieken (2a, 24) from the sheet metal. The SpSreissBsttes: aa £ a & ess koaisehen Mtse «aseite a Püfenmgseteg led in one of the inSngsschlifcze on *« eis, daetorek keaase 1 g B aet that on «te * köaise & ea teusseaseite the Spätsnattef ^ a ^ agapsdir ^ a ^ agapshe cter ^ a »Tellappea (15,16,17) correspond to… distributed coats (31,32,33,34) are formed. 21. Dowel according to claim 20, characterized in that the cams (31, 22, 33, 34) are so geometrically bound that they act as a centering device for jacket flaps (15/16, 17) of different lengths. 22. Dowel according to Anspruoh 20 or 21, characterized in that the longer jacket lobe (17) assigned nooks (34) on the outside of the mother axially lower than the shorter dumbbell ' Moeken (31,32,33) assigned to lappen (15,16). 23. dowel according to; any one of claims 20 to 22, characterized characterized, there is also a corresponding one for the web (18) connecting the jacket flaps (15, 16) IS Hocken (32) assigned to let. 24 «Dowel according to claim 23, characterized in that above the cams (32) one in the over the web (18) beginning slot (19) matching . LosiGherungsrastnase (35) is formed. 25, Dfibel Jiaeh'einem .der. preceding claims, characterized 9 e Ie «a» β eic has that below the haste . projections .CtOfSG) - additional twist on the sleeve area * head. 143) eise äasa ^ aseeaäe ftnschlagschulfeer (44) aasgebiiaet is IFIf.11) 2S hungry egg claws (2S) are atisMolded » 26. H @ bel according to one of the preceding claims, characterized in that on the inside of the BBSLse 13) "an & ttelbex mtefifealb dee BSleeÄcaaäeß aaeb in" en .vorsprittgeaae gprge (42) are formed and * aa & es i ^ back of the thus ztss ^ meaiKirJcendea 27. Dowel according to one of the preceding claims; through this marked / that the claws as over the ümfiangsfläehe of the sheet metal shell (3) to the outside radially protruding sleeve collars (40) are formed S (Fig. 10). 28. Dowel near claim 27 / characterized net / that seen in the longitudinal direction of the sheet metal sleeve O) at a distance from the sleeve collar (40) over the omfaag the ölechhülae protruding locking projections (10) are provided. 29. Dowel according to claim 27 or 28 / characterized / that the Rastvorspctinge (10) shower two diametrically opposed formations are formed from the jacket of the Biechhülse (3).