EP0728889B1 - Method for fixing components to hollow profiles and fixing and positioning elements for use therein - Google Patents

Abstract

The fastening is used on hollow mouldings, especially on a door or window, in which components are held against the external walls of the moulding, by at least one screw. The screw is retained by a fastening block which can be inserted behind the moulding wall, and which has at least one threaded hole (14). On the inside of the hollow moulding, the block is supported elastically on both sides, normal to its insertion direction (E) and parallel to the wall. It may be guided to the correct position relative to the hole in the moulding through which the screw passes.

Description

The invention relates to an attachment of Components on hollow profiles of the preamble of the claim 1 corresponding type and one to be used Fastening piece of the preamble of claim 4 corresponding Art.

Modern door and window structures include fixed ones and sash made of hollow profiles made of metal or Plastic or combinations of both. The fittings load-bearing walls of the hollow profiles are usually flat, and the fittings, in particular the hinge flaps, become flat placed in front of the wall and using cap screws that correspondingly drilled holes in the band tabs and Reach through perforations in the wall and in threaded parts intervene inside the hollow profile, on the hollow profiles attached. The threaded parts can be fastened with Be threaded holes, as is known from DE 25 34 824 A1 emerges, or reinforcement plates, through their holes from the side of the component or the belt tab a spreader nut can be passed through when tightening the fastening screw from behind against the edge the hole in the reinforcement plate and thus the Abutment for the mounting screw forms whose Forces are distributed through the reinforcement plate so that the relatively thin-walled hollow profiles are not used locally become. An example of these reinforcement plates emerges from DE-GM 72 39 074.

With the expression "fastening piece" both the actual fasteners with tapped holes according to DE 25 34 824 A1 as well as the reinforcement pieces according to DE-GM 72 39 074.

When assembling an outer component Bands it is necessary to attach the fasteners each to bring it blind to the attachment point by running lengthwise through the hollow profile right place with the help of a rod-like feed tool be pushed through. It is from the DE 25 34 824 A1 and DE-GM 72 39 074 known, the respective Fastening piece by a resilient element press against the back of the wall of the hollow profile, to which the tape is to be attached. The springy Element can be a between the rear side of the mounting piece and the opposite inner wall of the Hollow profile arranged compressible block or but a spring clip, which in practice mostly consists of one there is a correspondingly bent steel strip.

The effect of this resilient pressing element is one double: on the one hand it holds the fastening piece in Attach to the back of the wall so that the mounting screws their thread in the Fastener finds, and it holds the other hand Fastening piece inside the hollow profile in the Longitudinally fixed, so that no uncontrolled shifts of the fastening piece occur.

Due to the resilient design of the spring element this is for a variety of those on the market located hollow profiles can be used, which among other things in cross section and in the dimensions of the cavity in distinguish an area by the spring element can be bridged while maintaining its effect.

When mounting the conventional Art was the fastener perpendicular to that Component-bearing wall of the hollow profile against its Back is pressed parallel to this wall parallel free for insertion direction. Because the mounting piece also in this cross direction for many types of Hollow profiles should be suitable, it must be the smallest occurring hollow profile must be matched and therefore has in Normally in the transverse direction parallel to the back wall Game. So that the fasteners are inside the Do not shift the hollow profile in the transverse direction when pushing in, have designed the door and window manufacturers suitably Sliding tools on hand that are preferred on that processed hollow profile are matched and the fastening piece give a guide in the transverse direction.

But if a door and window manufacturer is different he had to process designed hollow profiles several push rods with different designs Keep guide heads ready or without lateral guidance Insert fasteners, resulting in time-consuming repositioning Could be an occasion.

The invention has for its object the generic Attachment in terms of positioning the fastening piece when inserted into the hollow profile to improve.

This object is represented by the one in claim 1 Invention solved.

The fastening piece is thereby guided not just perpendicular to the back of the mounting wall, but also parallel to this in the transverse direction Insertion direction. The fastener is so through his own design without additional aids the transverse direction in a certain position, the it retains when inserted, so that the rod-shaped Insertion aid only the force in the longitudinal direction of the hollow profile has to muster. Thanks to the resilient training the support in the transverse direction is the fastening piece without changes also for hollow profiles different suitable internal dimensions.

If a fastener with a certain resilient Crosswise support is provided normally only for a certain position of the perforations in positioned the wall. With different bands and hollow profiles, the perforations, in the transverse direction seen, but sit in different places.

To be able to cope with this problem, too additional guide means may be provided which at Approach of the fastening piece to the fastening point the fastener in the right direction Location.

The positioning does not only have to be in the transverse direction take place, but also in the longitudinal direction of the hollow profile. A mark on the rod-shaped insertion aid, the a certain insertion depth is only an imperfect one Positioning means, especially with different Door and window constructions different fastening points, seen in the longitudinal direction of the hollow profile, can occur.

For this reason, an additional one is recommended Positioning aid according to claim 3, which has a stop forms and the other when reaching the attachment point Pushes in automatically without observing markings stops.

One to use for the attachment described Fastener has the features of claim 4.

The fastener is not just a resilient element perpendicular to the back of the wall pressed against this, but also parallel to the back led across the insertion direction.

In the preferred embodiment of the invention are the resilient elements as spread resilient wings trained for a fairly wide range of different Dimensions of the interior of the to be processed Hollow profiles are suitable.

The wings can in practice in claim 6 reproduced manner.

It gives an indication of the length of the wings Claim 7. The length of the mounting piece can vary be. A fastener with only one threaded hole does not generally occur because the Band tabs arranged on the front of the wall in a rotationally fixed manner have to be. If there are two threaded holes Dimensions of the threaded pieces in the range from 50 to 100 mm. For longer fasteners, for example, for three-part The length of the wings in the above bands can be indicated area remain.

An important embodiment is the subject of the claims 8 and 9 and affects that the mounting piece in the area of its contact surface an approximately C-shaped Profile receives what the attachment of both the resilient Elements, which are used for the pressure perpendicular to the Wall is responsible, as well as the wing in simpler Way by inserting appropriate designs allowed the same lengthwise in the undercuts.

The feature of claim 10 can also for the function the attachment according to the invention be essential. Without any special measure, the resilient guide in the transverse direction parallel to the back of the wall as a result the fastening piece in this direction in a certain Location is positioned. But it has already been mentioned that the perforations in the wall of the hollow profile in Can sit crosswise in different places. The V-shaped spring clips act like a Funnel, which when inserting the fastening piece a projection protruding into the interior of the hollow profile comes to rest and the fastening piece also in Transverse direction in a matched to the position of the perforations Position is able to push away.

Training and defining the perpendicular to the back the wall-acting resilient element can in the Claim 11 reproduced manner. However, this is just one embodiment. It also come from wire curved spring clips, e.g. from a hairpin-like curved double wire.

The same applies according to claim 12 for the Wing while claim 13 the common attachment both elements with the help of the undercuts describes the mounting piece.

In particular, the wings in the in the claims 14 and 15 reproduced manner. Alternatively can also the head surface in the in claim 16 serve described manner for fastening the wing. Of the The spring clip and the wings can be separate parts, however they are in a preferred embodiment according to claim 17 formed in one piece, for example according to the Claims 18 and 19.

The definition of the spring clip and / or the wing, tongues that can be inserted into the undercuts are present can in the reproduced in claim 20 Way easily made. The tongues are there in the undercuts by using in a press a cylindrical mandrel on both undercuts simultaneous embossing clamped.

An important characteristic for achieving positioning the longitudinal stop is also in the longitudinal direction the mounting piece described in the claim 22 Way can be formed and with one in that Protruding inside the hollow profile, the place of Perforations in the wall of the same defining projection interacts in a manner yet to be described.

Such a projection can be achieved with a positioning aid temporarily created according to claim 23 which in the manner described in claim 24 can be trained. After positioning the The positioning aid is removed, so that the fastening screws into the fastening piece can be screwed in.

Since a hinge is usually with two screws on the Fastener is set, the wall of the Hollow profile two holes on a line in the longitudinal direction of the hollow profile one behind the other.

Due to the configuration according to claim 25, this can Constellation can be exploited to not only positioning in the longitudinal direction, but at the same time an alignment to achieve the fastening piece in the longitudinal direction, by namely the two projections one behind the other in engage the longitudinal groove of the fastening piece and this against rotation about an axis perpendicular to the wall protect in the hollow profile.

A positioning aid with protrusions for longitudinal adjustment, that reach through the perforations in the wall, assumes the presence of a corresponding one Stop on the fastening piece, which e.g. in the form of a pin on the attachment piece extra must be attached. The effort naturally goes to make the fastener so easy and cheap as possible, since after installing the outer component or the tape in general never again is used and remains in the hollow profile.

One way to stop the fastener can be saved by designing the positioning aid, which are used over and over again can, according to claim 26.

So that the swivel lever with when swiveling the end engaging in the interior of the hollow profile pro Swing angle as large a stroke as possible perpendicular to the Wall, a design according to is recommended Claim 27.

The hook according to claim 28 causes the positioning aid when inserting the fastening piece does not have to be held, but temporarily locked automatically on the outside of the hollow profile.

In detail, the hook and the positioning piece in those described in claims 29 and 30 Way to be realized.

Fig. 1 zeigt einen Horizontalschnitt durch einen Holm des feststehenden Rahmens und des Flügelrahmens bei einer Tür oder einem Fenster aus einem Aluminium-Hohlprofil;

Fig. 2 zeigt eine perspektivische Ansicht eines Befestigungsstücks;

Fig. 3 zeigt einen Schnitt nach der Linie III-III in Fig. 2;

Fig. 4 zeigt einen Horizontalschnitt durch ein aufrechtstehendes Hohlprofil mit angesetztem Positionierhilfsstück;

Fig. 5 zeigt eine Ansicht gemäß Fig. 4 von oben;

Fig. 6 zeigt eine entsprechende Ansicht, teilweise im Schnitt, die das Einschieben des Befestigungsstücks erkennen läßt;

Fig. 7 und 8 zeigen der Fig. 6 entsprechende Ansichten weiterer Einschiebphasen;

Fig. 9 zeigt einen Querschnitt des Hohlprofils mit ganz eingeschobenem Befestigungsstück nach der Linie IX-IX in Fig. 8;

Fig. 10 zeigt einen Federbügel und die zugehörigen Flügel in perspektivischer Darstellung;

Fig. 11 zeigt die Teile nach Fig. 10 in an dem Befestigungsstück montiertem Zustand;

Fig. 12 und 13, 14 und 15, 16 und 17 zeigen entsprechende Ansichten weiterer Ausführungsformen;

Fig. 18 zeigt ein alternatives Positionierhilfsstück beim Einschieben des Befestigungsstücks;

Fig. 19 zeigt eine Fig. 18 entsprechende Ansicht bei in der richtigen Lage angekommenem Befestigungsstück;

Fig. 20 zeigt eine Ansicht dieses Positionierhilfsstücks nach der Linie XX-XX in Fig. 19.

Exemplary embodiments of the invention are shown in the drawing.

Fig. 1 shows a horizontal section through a spar of the fixed frame and the sash frame in a door or window made of an aluminum hollow profile;

Fig. 2 shows a perspective view of a fastening piece;

Fig. 3 shows a section along the line III-III in Fig. 2;

Fig. 4 shows a horizontal section through an upright hollow profile with attached positioning aid;

FIG. 5 shows a view according to FIG. 4 from above;

Fig. 6 shows a corresponding view, partly in section, which shows the insertion of the fastener;

7 and 8 show views corresponding to FIG. 6 of further insertion phases;

Fig. 9 shows a cross section of the hollow profile with the fastening piece fully inserted along the line IX-IX in Fig. 8;

Fig. 10 shows a spring clip and the associated wings in a perspective view;

FIG. 11 shows the parts according to FIG. 10 in the state mounted on the fastening piece;

Figures 12 and 13, 14 and 15, 16 and 17 show corresponding views of further embodiments;

Fig. 18 shows an alternative positioning aid when inserting the fastening piece;

FIG. 19 shows a view corresponding to FIG. 18 with the fastening piece having arrived in the correct position;

FIG. 20 shows a view of this positioning aid along the line XX-XX in FIG. 19.

In Fig. 1 is a horizontal section through an upright Spar 1 of a fixed frame and one upright Spar 2 of a casement recognizable. The spar 1 consists of a front hollow profile 3, which to avoid of cold bridges with plastic profiles 4 with a rear hollow profile 5 is connected. As well the spar 2 of the casement consists of a front Hollow profile 6, which via plastic profiles 7 with a rear hollow profile 8 is connected. With the hollow profile 3 is the tab 9 of the whole designated 10 Band, connected to the hollow profile 6 of the tab 11. The Band tabs 9, 11 are from the outside against those in the exemplary embodiment flat walls 20 of the hollow profiles 3 and 6 set and there through the band tabs 9, 11 and perforations 13 in the respective wall 20 penetrating fastening screws 12 set in threaded holes 14th of fasteners 15 which engage with a contact surface 16 against the rear 20 'of the wall 20 of the the respective hollow profile 3 or 6. The fastening screws 12 are designed as cap screws with her head 17 on shoulders 18 of the band tabs 9 and 11 respectively seated by a hinge axis Hinge pins 19 are pivotally connected to one another.

As can be seen from FIGS. 2 and 3, this shows Fastening piece 15 a cuboid body 49 and in the contact surface 16 formed by a cuboid surface a longitudinal groove 22, in the flanks 23 at the bottom of the Longitudinal groove directed against each other along the longitudinal groove 22 extending transverse grooves 24 are provided so that the Fastening piece 15 in the area of the contact surface 16 a Forms a C-profile, in which a spring clip 25 made of spring steel with one end 25 'lengthwise up to a certain depth can be inserted. The inserted The end of the spring clip 25 is opposite to each other Nierder stampings 26 clamped in the longitudinal grooves 24. The spring clip 25 is when the in Fig. 2 shown in the force-free state of the mounting piece 15 compressed into the hollow profiles 3 and 6 and serves the fastening piece 15 with its contact surface 16 against the back 20 'of the wall 20 with a Press force S, the spring clip 25 against the opposite wall 21 of the hollow profile 3 or 6 supports. The fastening piece can be used to save material 15 also be beveled in a trapezoidal shape, such as shown at 15 '' in Fig. 3. The fastening piece 15 is by means of a rod-like auxiliary tool End of the hollow profile 3 or 6 up to the attachment point advanced.

This measure, a fastener perpendicular to Pressing the wall is part of the state of the art.

In the attachment piece 15 is in addition to the Pressure in the sense of force S is a guide parallel to the wall 20 transversely to the insertion direction by managers P given by wing 30 generated from spring steel be in the insertion direction E V-shaped spread and with their front edges 30 'during insertion in the hollow profiles 3 and 6 transverse to the direction of insertion something to be squeezed together and facing each other Walls 27, 28 of the hollow profiles 3 and 6 issue. As a result, the fastening piece 15, which much narrower than the distance between the walls 27, 28 is held in a middle position and parallel to Wall 20 led transversely to the insertion direction E. How from 6 can be seen, the wings 30, 30 normally run symmetrical to one in the longitudinal central axis of the Fastener 15 located expansion axis 39 (Fig. 6).

The wings 30 are in the embodiment of the Fig. 2 at its end facing the fastening piece 15 connected by a head piece 31 approximately trapezoidal, which with a rivet 47 on the same face 15 'of the fastening piece 15 is fastened which also exits the spring clip 25.

The spreading plane of the wings 30 is parallel to that Contact surface 16. The flat material in the shape of Spring steel existing wing 30 and the headpiece 31st are vertical on the spreading plane. The wings 30 and the head piece 31 are made in one piece by bending one Spring steel cut made. The upper in Fig. 2 Edges 30 ″ of the wings 30 run in the plane of the contact surface 16.

In the bottom of the longitudinal groove 22 is on the spring clip 25 side facing away from the spring clip 25 Threaded bore 14 a stop 32 in the form of a pin 33 let in, the purpose of which will be described.

The fastening piece 15 acts when it is positioned in the right place under the perforations 13 of the Wall 20 together with a positioning aid 40, which is shown in Figs. 4 to 9. The positioning aid 40 consists of a cuboid aluminum piece 41, which has an abutment surface 48 can be brought to bear against the wall 20 and the perforations 13 engages with projections 42 by the above Ends of pressed into the aluminum piece 41 Pins 43 are formed. The pin 43 can on the in the inside of the hollow profile engaging part cylindrical or also in the manner shown in FIGS. 4 to 9 be somewhat flattened, with the levels of flattening run parallel to the longitudinal direction of the hollow profile 3. The projections 42 reach less into the interior of the Hollow profile 3 as the longitudinal groove 22 is deep.

The fastening piece 15 is inserted by one end of the hollow profile in the direction of insertion E with the help of a push rod 45 and a widened the distance between the walls 27,28 almost filling 44 comprehensive auxiliary tool, which it allowed the mounting piece 15, which by the Spring clip 25 in contact with the wall 20 and through the Wing 30,30 approximately in the middle between the walls 27,28 is held lengthwise through the hollow section 3 push through.

In the embodiment shown in FIG. 6 the holes 13 are not in the middle between the Walls 27, 28, but by an amount 34 according to FIG. 6 shifted to the right. So normally the fastener would 15 the correct position in which the Perforations 13 in the wall 20 and the threaded holes 14 cover, not reach.

However, the V-shaped spread wings 30 have one Kind of funnel function. The right wing 30 in FIG. 6 comes when inserting the fastening piece 15 further into the 6 upper projection 42 of the positioning aid 40 and presses against the spring force the wing 30, 30, the leading end of the fastener 15 somewhat to the right, as can be seen in FIG. 7 is. This allows the upper projection 42 of the positioning piece 40 in the manner shown in FIG. 7 in the Enter the end of the longitudinal groove 22. With further advancement 7, the lower projection 42 in the longitudinal groove 22 arrive. This makes the fastening piece 15 led out from the center and positioned correctly. A rotation of the fastening piece 15 by one axis perpendicular to wall 20 cannot occur because two successive projections 42, the width of which the width of the longitudinal groove 22 is adapted into the longitudinal groove 22 intervene.

8 shows the final phase of insertion, which is achieved when the in the longitudinal groove 22 of the Fastening piece 15 attached stop 32 on the according Fig. 8 upper projection 42 comes to rest. In this The point is the positioning also in the longitudinal direction. As can be seen from Fig. 9, then coincide the threaded holes 14 in the fastening piece 15 and the perforations 13 in the wall 20. It can be the positioning aid 40 now be removed to the mounting screw 12 screw into the threaded holes 14.

10 and 11 are in the embodiment the spring clip 25 and the wing 30 separate parts. To the Spring clip 25 is a in the longitudinal direction in the transverse grooves 24 insertable tongue 29 formed. The two wings 30 form a bent part with the connecting head piece 31 made of spring steel, being at the top of the headpiece 31 also a tongue 35 is provided, the can be inserted into the transverse groove under the tongue 29. Both Tongues 29, 35 become common through the depression 26 clamped in the transverse groove 24. The insertion depth on the Spring clip 25 results from the gradation 29 ', which is when inserted in front of the front of the mounting piece 15 sets.

In the embodiment of FIGS. 12 and 13 is the Spring clip 25 is formed as in FIGS. 10 and 11. The However, wings 30, 30 are on a plastic injection molded part 36 formed, which also has a head part 37 the upper edge of a cutout 38 for the penetration the tongue 29 is provided. So it becomes the plastic injection molded part 36 in front of the end face 15 'of the fastening piece 15 set and the tongue 29 lengthwise in the Cross grooves 24 inserted. In doing so, they apply the width gradations 29 ′ adjacent regions of the spring clip 25 in the mutually facing inner sides of the wings 30 provided grooves 36 'of the plastic injection molded part 36, whereby the fixing of the head part 37 on the front side 15 in the vertical direction according to FIGS. 12 and 13 given is. The width gradations 29 'lie against that Head 37 on. The definition of the end of the tongue 29 takes place through the embossing 26, with which at the same time also the plastic injection molded part 36 is fixed.

In the embodiment of FIGS. 14 and 15 exist the spring clip 25 and the wing 30 in one piece a punched cut from spring material and done the common determination as in FIG. 2 by a the hole 46 in the head piece 31 penetrating rivet 47.

16 and 17 are in the embodiment the spring clip 25 and the wing 30 also in one piece trained, but this time as a molded plastic part. At the end of the spring clip adjacent to the head piece 31 25, a tongue 35 is injection molded into the transverse grooves 24 insertable and clampable by the embossing 26 is.

18 to 20 is another positioning aid 50 shown that it allows without the Stop 32 on the fastening piece 15 get along. The Insertion direction E runs in this embodiment from the bottom up. The positioning aid 50 is a Plastic injection molded part in the form of against the wall 20 box open to the opposite side, in the interior 51 at the bottom a hook 52 on the free End of one arm 53 of an extended two-armed lever 54 is arranged, the other arm 55 from the Body 58 of the positioning aid 50 perpendicular to Wall 20 protrudes. The hook 52 has, as shown in FIG. 19 up. On the opposite side, this shows Positioning aid 50 one in the lower according to FIG. 19 Hole 13 engaging projection 57, which against the wall opposite the insertion direction E. Hole 13 sets, but does not fill their entire cross section, so that the hook 52 also fits through.

As can be seen from FIG. 20, the hook 52 much narrower than the width of the interior 51 and is arranged in the middle. On both sides up to the walls of the "box" there extend into close to the outer boundary of the "box" shaft journal 56 that can be easily twisted. If the positioning aid 50 is to be positioned set it with its contact surface 48 against the wall 20, with the projection 57 in the reproduced position brought in the lower perforation 13. At the same time the hook 52 opposite the position shown in FIG. 18 or 19 slightly by attacking the protruding arm 55 shifted below, whereupon he inserted into the lower perforation 13 and when you release the lever 55 the upper one Can reach behind the edge of the perforation 13. The positioning aid 50 is now fixed to the wall 20 and can be released.

In the recess 51 of the positioning aid 50 is above the pivot lever 54, i.e. in insertion direction E offset, a second pivot lever 64 mounted, the also narrower than the width of the recess 51 and is mounted on torsional shaft journal 66, which in close to the outer boundary of the "box" itself up to extend the side walls of the recesses 51.

The pivot lever 64 has a first leg 62, which is from the shaft journal 66, which is close to that of the wall 20 remote limitation of the positioning aid 50 are arranged in the force-free state perpendicular to Wall 20 extends against this. To the free end the leg 62 closes parallel to the wall 20 in the insertion direction extending leg 63 on the 18 and 19 to the right at its free end is angled approximately at right angles in a leg 65, that in the force-free state as in the position according to FIG. 19 passes through the upper perforation 13.

If the positioning aid 50 on the wall 20th is attached and the fastening piece 15 according to FIG. 18 is pushed from below in the insertion direction E, presses the spring clip 25 the pivot lever 64 by twisting the Shaft journal 66 back into the wall 20. The front end of the leg 65 slides along the bottom of the groove 22. With continued insertion, they eventually overlap Hole 13 and the threaded hole 14, and it snaps Leg 65 into the upper threaded bore 14 as in Fig. 19 is shown. When this point is reached the fastening piece 15 is correct in the longitudinal direction positioned. The positioning in the transverse direction will initiated by the wing 30 by the projection 65 lead into the longitudinal groove 22 and in the transverse direction Fastening piece 15 until the correct one is reached Push the side position away if necessary. By actuation of the pivot lever 54 can the positioning aid 50 released and removed. Due to the spring action of the spring clip 25, the fastening piece 15 remains in the achieved positioning. The fastening screws can be screwed in.

Claims (30)

1. Attachment of a component to a hollow section, in particular hinge parts (9, 11) of doors, windows and the like to the fixed frame and/or flap frame formed by hollow sections (3,6), the respective component being applied against a wall (20) of the hollow section (3,6) from outside and being attached on it by means of at least one attachment screw (12), which passes perpendicularly through holes in the component and the wall (20) and is screwed into an attachment piece (15) arranged inside the hollow section (3,6) on the back face (20') of the wall (20) and having at least one threaded bore (14), the attachment piece being inserted longitudinally through the hollow section (3,6) to the attachment point before insertion of the attachment screws (12) and being resiliently urged against the back face (20') of the wall (20) by forces acting perpendicular to it, characterised in that the attachment piece (15) is also resiliently supported in the interior of the hollow section (3, 6) on both sides parallel to the wall (20) and transversely with respect to the direction of insertion (E).
2. Attachment according to claim 1, characterised in that guide means are provided on the attachment piece (15), by means of which the attachment piece (15) is guided into the correct position in relation to the position of the holes (13) parallel to the wall (20) and transversely with respect to the direction of insertion (E) as it is inserted and approaches the attachment point.
3. Attachment according to claim 1 or 2, characterised in that the attachment piece (15) has associated with it a positioning aiding piece (40,50) which is applied to the wall (20) of the hollow section (3, 6) at the attachment point from outside and has projections (42, 65) which engage through the holes (13) into the interior of the hollow section (3, 6), the projections co-operating with the attachment piece (15), on insertion of the latter, for positioning it along and/or transverse to the direction of insertion (E).
4. Attachment piece for use in the attachment according to one of claims 1 to 3, with a body which includes an engaging face (16) for engagement against the back face (20') of a wall (20) of a hollow section (3,6) and at least one threaded bore (14) extending perpendicular to this engaging face (16) for an attachment screw (12), as well as a resilient element (25) which is designed, with the attachment piece (15) inserted in the hollow section (3,6), to abut against the side of the hollow section (3,6) opposite the wall (20) and to be urged against the back face (20') of the wall (20) by means of the attachment piece (15), characterised in that there is provided on the attachment piece (15) at least one further resilient element, by means of which the attachment piece (15), when inserted in the hollow section (3,6), is resiliently supported on the hollow section (3,6) on both sides parallel to the back face (20') of the wall (20) and transverse to the direction of insertion (E).
5. Attachment piece according to claim 4, characterised in that there are provided on that side of the attachment piece (15) which leads on insertion two wings (30) which spread apart in a V-shaped manner in the direction of insertion along a plane parallel to the engaging face (16) and are capable of being squeezed together in opposition to the spread, and which are designed with their leading edge (30') in the state inserted into the hollow section (3,6) for engagement against mutually opposite walls (27, 28) of the hollow section (3,6) which are parallel to the back face (20') of the wall (20) and transverse to the direction of insertion (E).
6. Attachment piece according to claim 5, characterised in that the wings (30,30) form together a V-shaped member of flat material which is angled back in the plane of spreading in such a way that the face of the flat material stands perpendicular to the plane of spreading, and that the wings (30,30) are attached at the base of the "V" to the end of the attachment piece (15) which carries the bight (25) of the spring.
7. Attachment piece according to claim 5 or 6, characterised in that the wings (30,30) have in the direction of insertion a length of from 0.5 to 1.0 times the length of the attachment piece (15).
8. Attachment piece according to one of claims 4 to 7, characterised in that there is provided in the engaging face (16) of the attachment piece (15) a continuous longitudinal groove (22) and the flanks (23) of the groove (22) have undercuts.
9. Attachment piece according to claim 8, characterised in that the undercuts are formed as transverse grooves (24) of rectangular cross-section formed in the flanks (23) of the grooves and with sides parallel to the engaging face (16).
10. Attachment piece according to one of claims 5 to 9, characterised in that the wings (30,30) extend towards the end of the attachment piece (15) on the respective flank (23) of the groove (22) present on its side.
11. Attachment piece according to one of claims 8 to 10, characterised in that the resilient element for urging the attachment piece (15) against the back face (20') of the wall (20) is in the form of a hairpin spring (25) of flat material and inserted with one end in the undercuts and secured therein in the direction of the length of the groove (22).
12. Attachment piece according to one of claims 5 to 11, characterised in the wings (30,30) have a tongue (35) which extends opposite to the direction of insertion (E) and which is inserted into the undercuts from the end of the attachment piece (15) which leads on insertion, and is secured therein in the direction of the length of the groove (22).
13. Attachment piece according to one of claims 5 to 12, characterised in that the end (25'), (29) of the hairpin spring (25) and the tongue (35) of the wings (30,30) are inserted in the undercut over one another and are secured therein in the direction of the length of the groove (22).
14. Attachment piece according to one of claims 1, to 13, characterised in that the wings (30,30) are connected together by a head surface (31) perpendicular to the axis of spreading (39).
15. Attachment piece according to claim 14, characterised in that the tongue (35) is angled back from the head face (31) opposite to the direction of insertion (E).
16. Attachment piece according to claim 14, characterised in that the head face (31) is riveted against the face (15') of the attachment piece (15).
17. Attachment piece according to one of claims 5 to 16, characterised in that the hairpin spring (25) and the wings (30,30) are formed as unitary component.
18. Attachment piece according to claim 17, characterised in that the component is a bent sheet metal member.
19. Attachment piece according to claim 17, characterised in that the component is a plastics injection moulding.
20. Attachment piece according to one of claims 8 to 15 and 17 to 19, characterised in that, for securing the hairpin spring (25) and/or the tongues (29,35) in the region in which they engage in the undercuts, a downward stamping deformation (26) is provided on the edges of the groove (22).
21. Attachment piece according to one of claims 4 to 20, characterised in that a longitudinal stop (32) is provided axially outside a threaded bore (14) in the groove (22) in the attachment piece (15) and does not project beyond the engaging face (16).
22. Attachment piece according to claim 21, characterised in that the longitudinal stop (32) is formed by a pin (33) inserted in the attachment piece (15).
23. Attachment piece according to one of claims 1 to 22, characterised in that there is associated with it a positioning aiding piece which includes a body (41,58) with an engaging face (48) for the front face of a wall (20) of the hollow section (3, 6) and at least one projection (42) standing proud of the engaging face (48), which can be inserted through the hole (13) in the wall (20) and projects on the back face (20') of the wall (20) by an amount less than the depth of the groove (22), so that the attachment piece (15), on insertion into the hollow section (3,6) comes into engagement with the longitudinal stop (32) against the projection (42) when the hole (13) in the wall (20) and the associated threaded bore (14) in the attachment piece (15) come into line.
24. Attachment piece according to claim 23, characterised in that the projection (42) is formed by a pin (43) inserted into the positioning aiding piece (40) and having a thickness corresponding to the clear width of the longitudinal groove (22).
25. Attachment piece according to claim 23 or 24, characterised in that the positioning aiding piece (40) has two projections (42,42) following one another at the spacing of two holes (13,13) in the wall (20) of the hollow section (3,6).
26. Attachment piece according to claim 23, characterised in that it includes a pivoting lever (64) which is mounted to pivot at one end on the positioning aiding piece and on insertion of the attachment piece (15) can be urged away, pivoting against a spring force, as well as in its swung away condition it slides with its free end (65) along the base of the groove (22) and on reaching a threaded bore (14) snaps into the latter.
27. Attachment piece according to claim 26, characterised in that the pivoting lever (64) is bent back in one plane twice through respective right angles.
28. Attachment piece according to one of claims 23 to 27, characterised in that it includes a stop (57) which does not fill the hole in the cross-section, projects out of the engaging face (48), engages in a hole (13) in the wall (20) of the hollow section (3,6) and bears against that edge of the hole (13) opposed to the direction of insertion (E), and a hook (52) which projects through the remaining cross-section of the hole (13), engages behind that edge of the hole (13) which lies in the direction of insertion (E) and capable of being brought into and out of action, the hook securing the positioning aiding piece (50) to the wall (20).
29. Attachment piece according to claim 28, characterised in that the hook (52) is formed on the free end of the one arm (53) of a two-armed lever (54) of which the second arm (55) projects out of the positioning piece (50) towards that side which faces away from the hollow section (3,6).
30. Attachment piece according to claim 28 or 29, characterised in that it is formed as a box which is open towards two mutually opposite sides, that the two-armed lever (54) and the pivoting lever (64) are arranged in the interior (51) of the box and are smaller than the width of the box, and that the two-armed lever (54) and the pivoting lever (64) are mounted pivotally on resilient torsion pins (56,66) in the neighbourhood of the edge of the box which faces away from the engaging face (48).

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