DE1902066A1 - Fastening element for connecting components - Google Patents

Description

Dipl. Ing. Fr. Thalrnann DIpL Ing, H- Schmitt

7β Freiburg L Brsg.

KartstraB · 33, TM. 3 Ol OO Max Langenslepen K.Q «. 783 Etenendlngen files S 68 jj60 Attach jgunffseleaent to connect components

The invention relates to a fastening element for connecting of several components made of wood, plastic «fibrous plates or the like, especially for the furniture industry, the fastening element being approximately cylindrical and preferential wise has a profile on its shaft ends that counteracts undressing.

Such fasteners are already known. On the dumbbell surface of their shaft ends, they have individual wedge-shaped barbs on twist lines running next to one another. With such fasteners, the borehole in the Component where such a fastening element is attached should be made fairly precisely and the material of this component must also have a corresponding strength have »so that the barbs got a sufficient hold there. In addition, such barbs are radial in their Dimensions quite limited.

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It is also already a wooden parts to be connected or the like, A drive-in bolt-like dowel with a see below from the center Known to the two dowel ends tapered shank sections, in which the tapered shank sections have a special profile. Such dowels can only then due to their barb-like shaft design in the

anchor the fixing hole if the material is to be connected * the wooden parts ad the like. sufficiently elastic 1st. This is not always guaranteed. The parts to be connected by the dowel are made of materials of different hardness and Elasticity, you get connections that can withstand very different loads with one and the same dowel formation. Even here is the pull-out force, this is the force that is used to pull the fastener out of the component with which it is

necessary fati connected / i is quite uncontrollable in its resentment.

Furthermore, dowels for connecting wood, plastic or others are already elastically deformable Parts made of a harder material than the parts to be connected are known, the dowel being effective over its entire Length the cross-sectional shape of a cross with equal bars » has length, which protrudes with one of its ends in each case a dowel loop of the parts to be connected to one another and lh this by means of "serrated teeth" attached to its circumference

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Projections, the sloping edges of which towards the center of the dowel « rise »can be anchored, this dowel in special Way can be produced from flat, rectangular parts. In the case of the & em fastening element, in addition to the disadvantages mentioned above, there is also the disadvantage that a cross-sectional area is relatively small and, accordingly, also the Anchoring possibility in the dttbe! Holes is small. In addition, the bending stiffness of this fastening element is not big.

The object is therefore to create a fastening element for connecting components in which the disadvantages of the pre-drilled fastening elements should be avoided · In particular, this fastening element should be simple Catfish, with or without glue, can be set in a fastening hole, the influence of the material properties of the component in which this fastening element should be determined, sjfelen a subordinate role target. Furthermore, a simple design and thus inexpensive manufacture of the fastening element is emphasized. Added value.

To solve this problem, the invention proposes a fastening element of the type mentioned, in which at least one The end is designed to be expandable and there is an expanding wedge

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in wears. Such a fastening element can be a corresponding one Fixing holes, in particular, can be inserted into · Saekhohrting; when the price wedge hits the perforated bottom is enough »by driving the fastener β further into the hole in the« price end of the fastener * - element it is driven in and moves its radial spreading, making it a particularly good and secure attachment of this Element is reached in the associated hole. Where this is Work very easy to do.

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According to a further development of the invention, the fastening element can have at least one “end with a central bore” - preferably symmetrical - recess or the like Have a cavity and at least one longitudinal shell dividing the fastening element there into at least two Spreizechenlcel. Such a hole, recess or the like. sehäfft the space for easy penetration of the spreading trowel into the corresponding end of the Befeetlgungseleaentee. A longitudinal misalignment that creates an expanding limb has a similar effect. Of course, recesses and longitudinal fillets can be provided at the same time at the respective end of the fastening element.

be seen.

Preferably, the expanding wedge can advance approximately in the axial direction before being driven into the fastening element.

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stand so that without special measures the expanding wedge In the fastener is driven in «if this? has reached the perforated base and the fastening element is driven a little deeper into this fastening hole.

The expansion cone, which is preferably conical, but optionally also flat wedge-shaped, can, according to a further development, have roughening, possibly groove-like roughening, on its rare surfaces, possibly in the for receiving serving this wedge «recess associated with counter profiles that correspond to this roughening. In this way it is achieved that an expanding wedge once driven into the fastening element is fixed there, even if e.g. the expansion legs of the fastening element not -o ' to be under the fastening pressure "

It is especially bizarre when the expanding wedge is in front the driving-in is connected to the fastening element by means of easily separable webs. Then this is together practically in one piece with the expanding wedge. This cannot be lost and is held in the driving position.

At times it is desirable if the fastener is still is also glued into the fastening loops «So

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the glue does not require a deeper insertion of the fastening thread lenient it counteracts and can also be distributed well, the invention proposes that the fastening element on Outer profile has open-edged longitudinal grooves «The glue can easily escape through these. With a suitably slotted end and a central bore through it, the glue can also emerge therethrough; these open-edged longitudinal grooves or the boreholes therefore help to achieve the most even distribution of the glue possible.

Pur a quick, if necessary, mechanical insertion of the fastening elements it is useful if these, in parallel arranged side by side. Belt-like with each other via webs are connected.

Further details of the invention are with her as Details that are essential to the invention are explained in more detail with reference to several exemplary embodiments. It show on a larger scale:

Fig. 1 is a side view of a fastener% Figo 2 is an end view according to the viewing direction A in Fig.l;

5 shows a somewhat modified fastening element; Flg. 4 is partially rotated by 90 ° with respect to FIG. 2

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sectional side view according to the section line IV-IV in Fig. 3 and

FIG. 5 shows one of numerous interrelated standing fastening elements-Ourt.

A fastening element 1 is essentially 'cylindrical formed and has a continuous axial bore At its two ends 2 and 4 is the fastening element designed according to the invention expandable and there are a spreading wedge 5 and 6 is provided on it. To facilitate the spreading, there are 3 and 4 axial longitudinal slots at the ends 7 is provided, by means of which the fastening element at the corresponding end 3 and / or 4 is split into two spreading legs 8 split 1st. Such longitudinal slots 7 are not absolutely necessary, since an expansion of the outer diameter of the Fastening element causing elongation in the case of a somewhat elastic fastening element material Setting this fastener can cause. In but it is usually advantageous by arranging a

V or more longitudinal slots found the ends 3 and 4 of the loading to provide fastening element there expansion legs 8, there then a slight spreading is guaranteed if the material of the fastening element is in the desired manner less elastic, but stable in tension. Before driving in, the expanding wedge 6 stands over the corresponding face

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-βίο in the axial direction. This spreading urge is set essentially composed of a conical and a frustoconical section 11 and 12, wherein the cone tip 11 protrudes into the bore 2. Furthermore, the expanding wedge 6 stands with the fastening element 1 via easily separable webs 13 in connection. Advantageously, the fastening element 1, in addition to the webs 13 and the price wedge (s) 6 in one piece made of plastic be made. Dor surcharge wedge 5 at the end of 3 öes fastening element 1 is designed in its outline shape essentially as a truncated cone and the bore 2 of the Fastening element 1 continues in this expansion part 5. This makes production particularly simple given.

In Fig. 3 and 4 is a slightly modified fastening element la shown. There the expanding wedges 5a roughly the shape of a flat wedge. In addition, they have groove-like roughening or transverse teeth on the side surfaces 17 is provided and the corresponding surfaces of the longitudinal slide 7a have corresponding counter-profiles Iß. If one drives such a wedge 5a into the associated Longitudinal slot 7a, it comes because of the profiles 17 and 18 to a form-fitting definition of this Wedge 5a. Easily separable webs 13 also connect the flaoh wedges 5a to the fastening element la.

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In Pig. 2 is dash-dotted and a wooden panel in section 20 indicated with a borehole 21 into which the fastening element la is to be inserted and fixed. One recognizes »that with further driving in of the fastening elements la into the bore 21 of the expanding wedge 5a located therein will impinge on the perforated bottom 22 and thereby this part 5a into the longitudinal slot 7a of the fastening element la penetrates and then spreads it open. In Pig. 3 and 4 can also be seen that the fastener la approximately in in the middle has a guide piece 22 that is smooth on the outside. Its diameter d corresponds almost exactly to the diameter of the borehole 21. This results in good centering and good radial support in the area of the borehole mouth. This guide piece, like the fastening element 1 according to Pig. 1 and 2 «have open-edged longitudinal grooves 25 for the glue to escape. In Figs. 1 and 2 such a design of the guide piece can be seen. In the area of its two ends, the fastening element 1 or la has a profile. In the Form of execution according to Pig. 1 and 2 there results the Outline form of several truncated cones placed coaxially on top of one another, the wider bases of which extend from the ends 3 or 4 point away; this results in one of the respective Pull-out direction counteracting sawtooth shape LMng profile. In the execution according to Flg. 3 and 4 is a thread-like profile of the shaft end 3 and 4 d ·· B «f # etigung» * lement # e la provided thereby

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you not only get a good grip of the end 3 or 4 to be spread, but also on one If necessary, a thread can also be screwed on. In addition, excess glue can escape through these threads. The expanding wedges 5 and 6 have, in particular if they have no roughening or the like. own, a Kellwinkel at which self-locking results. The hole 2 does not need to be designed as a through hole, but only needs to leave space for the introduction of a corresponding wedge.

For the mechanized or automated attachment of the fastening elements 1, these are via separating webs 30, lying parallel to each other, connected to a continuous Qufct G, as well from Flg. 5 emerges. Such Straps 0 can easily be fed to setting machines for attaching the fastening elements 1.

The fastening element according to the invention can be attached easily. Because of the possibility of expansion in the bottom of a non-material hole, a good fastening is obtained. The requirements for the accuracy of the borehole diameter are not too great. In particular, the fastening element 1 can also be used well for connecting workpieces made of different materials are used, e.g.

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if one material is very hard and the other is comparative ' is wise soft. In the case of a workpiece made of a softer material than that of the fastening element 1, the profilings of the fastening element 1 can move into Press in this softer material and claw it. If the fastening element, e.g. with its other end, placed in the bore of a workpiece which is harder than the material of the fastening element, e.g. in stone, marble or the like «there is predominantly one Deformation on the fastener 1 selfafc and this then presses against the hole wall feat. In both cases there is a good grip. If necessary, can adhesive can also be used for fastening.

It is particularly advantageous in the case of a fastening element 1 if an expanding wedge 6 is designed to be easily detachable by hand and provided with a more pointed centering cone 11 1st. Especially when such a fastener 1 is on His other.End 3 has a spreading bell 5 and therefore the end face 10 of the other end 4 serves as an impact surface when driving in the end 3, one can In this case, it is good to first remove the expanding wedge 6 from the fastening element 1, e.g. by tearing off the webs 13. After this it is set with its one end 3 in a borehole 21 you can use the surcharge wedge 6, for example-

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put back on and then another part to be fastened with the fastening element 1 in connection ' bring up. For the embodiment la according to Pig. > and 4 the same applies.

Especially if the fastener 1 is also included Glue or the like. Adhesive is attached, results in the Advantage that immediately after inserting this fastening element 1 there is already a good hold, even if the glue or the like. has not yet set. In this state, a continuation of the assembly is particularly desirable, because before the glue sets certain minor positional corrections of the fastening element are more easily possible.

All of the features described above can be used individually or in Combination with one another be essential to the invention.

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Claims (16)

/ 3 claims 1) Fixing element for connecting a plurality of components made of wood, plastic, fibrous or the like drives., In particular for the furniture industry, wherein the fastening element is "approximately cylindrical and. preferably has a profiling counteracting pulling out at its shaft ends, characterized in that at least one end (3; 4) of the fastening element (1) is designed to be expandable and carries an expanding wedge (5; 6) there. 2) Fastening element according to claim 1, characterized in that decrees that e3 has a central one at least at one end Bore, a preferably symmetrical recess od, the like. having. 3) Fastening element according to claim 1 or 2, characterized in that at least one end (3 or 4) has a LKngeeohlitz (7) dividing the fastening element there into at least two expanding legs (8). BATH ORIGINAL ' 009839/0716 4) Fastening element according to one or more of claims 1 to 3 * characterized in »that the expanding wedge (5j 6) before driving into the fastener (I) protrudes over this approximately in the axial direction. 5) Fastening element according to one or more of claims 1 to 4, characterized «that the expanding wedge (5; 6) is approximately conical. and possibly has roughening on the contact surfaces. 6) Fastening element according to one or more of the claims 1 to 4 "characterized" that the expanding wedge (5a) has roughly the shape of a flat wedge «, 7) Fastening element according to claim 6 «characterized in that that the expanding wedge (5a) has roughening, possibly groove-like, on its jacket or side surfaces inj The roughening has roughened areas where necessary (7a); Recesses corresponding to this wedge Oegenprofile are assigned. 8) Fastening element according to one or more of the claims 1 to 7 "characterized" that daa BATH 009839/0716 the expanding wedge (5s 6) before driving in by means of easily separable webs (13) are connected to the fastening element (l), 9) Fastening element according to one or more of claims 1 to 8, characterized in that it is made in one piece together with his or her expanding wedge (s) (5; 6). 10) Fastening element according to one or more of the approaches 1 to 9, characterized in that »it is on its outer profile, which may be designed as a threaded section, has open-edged longitudinal grooves (25). 11) Fastening element according to one or more of claims 1 to 10 «characterized in that it is on Both ends are designed to be spreadable and are each provided there with an expanding wedge. 12) Fastening element according to one or more of claims 1 to 11, characterized in that it is on at least one end is tapered in the attachment area and preferably with a longitudinal profile in relation profiled in a sawtooth-shaped barbed pattern on the respective pull-out direction " BATH ORIGINAL - * 5r 15) Fastening element according to one or more of the claims 1 to 12, characterized in that there is an approximately cylindrical guide piece in the middle area (22} with a largely smooth lateral surface which possibly a few axial longitudinal slots (25) are provided are. Fixing element according to one or more of the claims 1 to 11 and IJ, characterized in that at least one end has a substantially thread-like profile (35) owns. 15) Fastening element according to one or more of the claims 1 to 14, characterized in that several Fastening elements (1) are fastened to one another in a belt-like manner in parallel with one another via separating webs (30). 16) Fastening element according to one or more of claims 1 to 15, characterized in that at least one expansion wedge (6) 5a) has a tapered insertion cone (H), an acute-angled approach ^x surface (Ha) or the like. Has insertion aid and its connecting webs (13) are preferably designed to be easily detachable by hand 009839/0116 bathroom original