EP2292882A1 - Fitting for the metal frame of turn-tilt window or door panels - Google Patents

Abstract

The fitting goes on an angle piece and is connected to a wing. It has one short rigid connecting rod (6) and at least one longer connecting rod (12). The rods are on pivots (8, 13) in a first spacing (bb) of the fixed frame and on one side of the angle piece at a second spacing (aa) on pivots (7, 14) for attaching the wing.

Description

The inventions relate within the scope of the claims to an angle piece on a fitting and a method for rotatably coupling a wing and a frame, each with frame profiles made of metal, in which a fitting groove (usually called "Euronut") is not provided, but a reduced Depth of profile webs for guiding control rails (as espagnolette channel) is available. This formed behind a rollover and reaching into a rebate.

The prior art holds for wood windows a reinforced corner area ready, in which an elbow is provided to form a vertically rising reinforced pin as a pivot bearing, which pin protruding from a strong, short arm, which handlebar itself against a the frame associated Swivel joint is pivotable, cf. to the DE-C 40 19 450 (Hautau GmbH) with the one shown there FIG. 1 and associated description. Alternatively, also shows the DE-C 36 45 338 (Hautau GmbH) such a wing bearing with a herausschwenkenden from the corner short handlebar, but without an additional locking handle, as described by the first-mentioned font.

Both proposals of the prior art are directed to wooden profiles, in which a deep fitting groove is available to accommodate a thick in the horizontal section leg of an elbow. The vertical portion of this elbow is also strong (thick) formed to accommodate the stable upstanding guide pin can. Starting from the elbow, a wing-holding plate is provided, can be attached to the other handlebars, once only a handlebar and once two in the rebate crossing handlebar to guide the swinging of the wing for the movement and a lock in the closed state to deliver.

The invention is (subjectively) based on the task to provide a reduced space for the angle required in the corner (the elbow) in order to be adapted for metal profiles as sash can. Despite the reduced installation space, the angle piece in the corner area should not be mechanically weaker, but should have sufficient stability and strength, at least for metal profile wings, which is also required to form bearing points for control links which engage the horizontal leg of the angle piece. Here is a 'very short' distance from two camps before and this 'short distance' is due to the wing weight 'high load'.

The above object is achieved by an elbow or a fitting provided with this elbow (claim 1). The problem is solved with a method (claim 20).

The horizontal leg of the elbow may have a substantially T-shaped cross-section (claim 19). It can be inserted with this cross-sectional shape between projecting profile webs of the metal sash and has also suitable for insertion (adapted) cross-section (claim 1).

After insertion of the angle is fixed in its retracted end position, the assembly and the fixation thereby formed can start from the second, vertical leg (claim 7). Here, the leg rests against the vertical spar and allows in its end region by at least one, preferably a plurality of mounting holes a screwed fixation on the sash.

Starting point of all other joints is thus the angle fixed to the sash frame, with its inserted in the horizontal frame first leg, which includes at least two bearings: For a strong, towering bolt of the short handlebar and another bearing point for a longer control arm, which is not as thick as the short arm, but longer than this is formed (claim 19, paragraph bb).

To control the swung out of its rest position in the closed state from the frame corner region angle piece, the pair of short and long arm is held with two pivot points on the angle and the frame or an associated frame plate. The distance between the bearings on the frame is much larger than the distance between the bearings on the elbow (claim 20).

The at least one longer link can also be formed by two links articulatedly coupled to each other. One of these links carries at its end facing away from the frame a thrust piece or slider, which is relative to the angle in its distance changed (claim 10). This change is in the mounted state on the wing a longitudinal displacement.

Without a corresponding mounting on the wing, there is no rigid connection between the thrust piece and the elbow, but both are spaced apart by a joint provided with a pivot link coupling associated with each other (claim 13, 14 and claim 15). The assignment is chosen so that the horizontal leg and the thrust piece are substantially in the same plane, or have a comparable height position when they are moved towards and away from each other. This can be done a latching, in which the thrust piece in the approximate to the angle state at this locking sets (claim 9). The latching is done by a Verrastungsnase, which is mechanically deformed when it is clamped in a corresponding receptacle at the front end of the elbow. For a clamping receiving a plastic slider is suitable, which is also adapted for sliding in or between the metal webs of the metal profile (claim 11,12).

Both the thrust piece and the horizontal leg of the elbow are received between the profile webs of the metal profile. You may both have the substantially T-shaped cross section, however, only the thrust piece is provided for longitudinal movement between the profile sections. If both components are accommodated between the same profile sections, they have substantially the same width (claim 21).

For receiving and guiding between the metal webs a T-shaped design of horizontal leg and guide piece is provided (claim 21, claim 5, claim 2). The height of the horizontal leg and the guide piece can also essentially correspond to the rebate-oriented profile webs (claim 3).

It should be mentioned that with the cross-sectionally T-shaped elbow not necessarily a distance-variable guide piece must be coupled, but also without such a guide piece and two handlebars a controlling influence on the movement of the wing can be exercised, see. to the arrangement after DE-C 36 45 338 (HAUTAU GmbH).

If an additional handlebar still added (claim 16), the guide piece can then be performed by the two control arms in addition to the movement of the elbow, wherein a holding plate on the sash side falls away and is replaced by the leadership of the guide webs used with the wing of metal profile. One of the then provided two links has no joint on the frame or the frame associated with this Blendrahmenplatte, which may continue to be provided (claim 18).

Both handlebars can be arranged in a closed cross-section in a section in the closed state of the fitting (and in the closed state of the wing in the frame), which section has mutually facing receptacles and opposing cranks to allow the crossing in the rebate (claim 17).

The second leg of the elbow is strongly formed for receiving the vertically upstanding pin of the short arm (claim 7). Here, a highly loaded by the weight of the wing bearing is provided and the Ecklenker is designed to transfer the high wing weight accordingly. The reinforcement formed in particular as a thickening lies between the corner region of the angle piece and the mounting portion of the vertical leg as a receptacle for the vertical pin.

With the described embodiments is achieved to exploit a reduced space for the fittings for controlling the movement of the wing and still provide sufficient strength. It can light metal frame in profile training as a site be readily satisfied. In addition, a wing-side support and mounting plate for fixing the bearings can be omitted and is mutatis mutandis replaced by the metal profile itself, which provides its leadership property for longitudinal guidance and receives in the same way, the correspondingly formed horizontal portion of the elbow.

With a formation of the mutually facing end faces of the horizontal leg of the elbow and the substantially lying at the same height guide piece locking or locking of the open state can be achieved, which is provided by an elastically yielding deformation of a correspondingly formed locking lug.

To claim 19 special embodiments are possible. The reference numerals are not written. The following five paragraphs relate individually to claim 19.

The at least one longer link is formed by two rotatably articulated (17) coupled links (9,12), of which one link on the side of the fixed frame articulated (13) and the other link with another hinge point (11a) is arranged on a thrust piece (11). The other link (9) carries such a thrust piece (11) at its, in the open state of the frame farthest end (or, the elbow nearest end), which thrust piece (11) relative to the elbow (4) - in the mounted state - longitudinally movable is.

The thrust piece has a substantially T-shaped cross section (11 ', 11 ", 11 *).

The thrust piece (11) carries an angle piece (4) aligned Verrastungsnase.

Dimensions of the thrust piece (11) and / or its material are adapted to move, in particular sliding, in or between profile sections (50a, 50b) of a metal frame (mutatis mutandis: suitable).

Between the elbow and the thrust piece (11) is no rigid, fixed at a fixed distance connection.

Figur 1

veranschaulicht einen bevorzugten Montageort für die beschriebene Beschlagtechnik im Rahmen eines Aluminiumprofils (im Querschnitt).

Figur 2

zeigt zum Vergleich die Ausbildungen desselben Bereiches bei einem Kunststofffenster mit einem entsprechenden Kunststoffprofil, ist aber hinsichtlich der Ausbildung der Beschlagsnut 62 auch für Holzrahmen repräsentativ.

Figur 3

veranschaulicht eine perspektivische Ansicht des Winkelstücks mit zugehörigen Lenkern zur Ausbildung zumindest eines Abschnitts eines Beschlages.

Figur 4

veranschaulicht die Montage des Beschlags nach Figur 3 an einem Metallprofil in Einsteckrichtung E.

Figur 5

veranschaulicht im geöffneten Zustand eine Aufsicht auf den Beschlag mit dem Winkelstück nach Figur 3, wobei der Flügel zur Veranschaulichung entfernt worden ist, sich aber sinngemäß nach unten in Richtung des eingezeichneten Buchstabens "F" erstreckt.

Figur 6

veranschaulicht eine Seitenansicht des Eckbereiches F1 des Flügels F und Blendrahmens B, wobei der Flügel in geschlossener Stellung dargestellt ist und der Überschlag entfernt ist.

Fig. 7a, Fig. 7b

veranschaulichen Schnittdarstellungen entlang der Schnittebenen A1 und B1 von Figur 6, bezogen auf den horizontalen Schenkel 4b des Winkels 4 und eines Schubstücks 11 im Abstand von diesem Winkel.

In view of the fact that this application arose from a division, the entire disclosure of the parent application is hereby incorporated by reference. Embodiments explain and supplement the circumscribed and claimed invention.

FIG. 1

illustrates a preferred mounting location for the described fitting technique in the context of an aluminum profile (in cross section).

FIG. 2

shows for comparison the training of the same area in a plastic window with a corresponding plastic profile, but is also representative of the formation of the fitting groove 62 for wooden frame.

FIG. 3

illustrates a perspective view of the elbow with associated links for forming at least a portion of a fitting.

FIG. 4

illustrates the assembly of the fitting after FIG. 3 on a metal profile in the insertion direction E.

FIG. 5

illustrated in the open state a view of the fitting with the elbow after FIG. 3 in which the wing has been removed for illustration, but extends downwardly in the direction of the inscribed letter "F".

FIG. 6

illustrates a side view of the corner area F1 of the wing F and frame B, wherein the wing is shown in the closed position and the flashover is removed.

Fig. 7a, Fig. 7b

illustrate sectional views along the cutting planes A1 and B1 of FIG FIG. 6 , relative to the horizontal leg 4b of the angle 4 and a thrust piece 11 at a distance from this angle.

With regard to the operation of a fitting with a short, strong handlebar 6 reference is made to the patent specifications referred to above, which provide detailed descriptions of the operation and the displacement of the bracket. To summarize briefly the movement of the wing opposite the frame. It is a controlled movement, in which the short arm 6 moves so that the corner of the wing performs a combined translatory, rotational movement. This controlled movement guidance by an additional link, preferably handlebar 12 with the hinged frame-side articulation point 13 also allows wings with high wing weight to open and close, the main force of the wing on the short, structurally thick and therefore strong arm 6 on the frame is transmitted.

The arranged in the corner of the wing elbow 4 has a horizontal leg 4b and an upstanding leg 4a and a lying between the two corner region, which carries no separate reference numeral. In this corner region an upstanding pin of the short arm 6 is accommodated so that it extends far into the vertical leg. For this purpose, the vertical leg is thickened in a section 4c designed so that a safe guidance and formation of a pivot bearing position is possible.

To illustrate the location of the described Beschlagtechnik should on the Figures 1 and 2 to get expelled. FIG. 2 illustrates a plastic profile with a flap 61 and a rebate between the frame (bottom) and wings (top). The bottom 60 as a lower end face (fold) of the wing points to the rebate and has a commonly used fitting groove 62, in which guide rods are guided to control the movement and the locking of the wing. This fitting groove is relatively deep and has approximately an extension that corresponds to the vertical extent of the rebate. The associated dimensions a60 and b60 are shown for comparison. The space available in the rebate is different for a metal profile, for example made of aluminum. This illustrates the FIG. 1 , Here is the receiving space or the depth a50 of a guide 50a, 50b at substantially constant height b50 of the rebate much smaller than the mounting space available for mounting the elbow 4 at the lower edge 50 (fold) of the wing F.

The rod receptacle 50a, 50b is in its construction depth (compared with the height of the representations of FIG. 1 ) Only a50, which is much lower than the rebate 51 covered rebate with its height b50.

It can be seen that two L-shaped web portions 50a, 50b are provided on the profile web 50 facing the rebate space (the underside of the horizontal spar), the distance of which is dimensioned d. They protrude into the rebate space, but have only a small height a50 and are behind the rollover 51.

An adaptation of the angle to be mounted in the corner to the design of the profile illustrates the FIG. 3 , The attachment of this fitting portion with the angle 4 in the corner region F1 of the wing F, whose underside in section the FIG. 1 illustrates that shows FIG. 4 , Here, a plug-in direction E is provided, which illustrates at the front end in the corner area F1, the recording of a thrust piece 11 and the horizontal leg 4b of the angle 4. Beforehand, the front end of the web sections is to be exposed by abrasive machining.

The detailed structure of a fitting attributable section with angle 4, first link 12, second link 9 and the sliding thrust piece 11 shows in detail the FIG. 3 , Here, in a slightly open position (seen from the distance between the two links 9,12 and the slightly out-pivoted strong arm 6) training of the angle and the thrust piece 11 is shown. The bearing 13 of the first longer arm 12 is provided for the frame side. Its wing-side storage takes place at the angle 4 in the horizontal leg 4b at the bearing point 14. Both bearings are pivot bearings. The second link 9 is provided to carry at its end portion associated with the wing, the thrust piece 11 at a further pivot point 11 a. The second link 9 is coupled via a pivot bearing 17 with the first link 12. Its to the frame facing end 9a is provided as a receiving handle, which in the closed state by a bolt 10 according to FIG. 5 engages to lock the closed position of the fitting.

The slightly open state of the fitting shows according to FIG. 3 The upwardly projecting pin is concealed by the thickened portion 4c, but it is easy to imagine that in the compressed section a bore as a receptacle for the vertically towering Pin of the strong arm 6 is provided.

The angle can be made of metal, in particular zinc die-cast. The short link may be made of high strength metal and the slider 11 may be formed of a plastic to guide it and slide between the profile sections 50a, 50b after FIG. 1 adapt.

For dimensioning the altitude corresponding to the height position of the guide piece 11 on the pivot 11a of the height position of the horizontal leg 4a of the elbow 4. Is the fitting after FIG. 3 is further opened - assuming a mounting of the corresponding bearings 8, 13 on the frame and assuming a recording of the horizontal leg 4b and the thrust piece 11 on the frame - to assume a movement of the thrust piece 11 on the front end of the leg 4b of the angle 4. The fully open state then shows the FIG. 5 in which an elastically deformable nose 11 b engages in a corresponding receptacle 4 d to lock the open position of the wing F or at least easy to lock. The force of the locking is determined by the elastic deformation of the two nose legs, which engage in the receptacle 4d accordingly. A slotted formation of the nose is a possible embodiment and an undercut in the receptacle 4d can be adapted to additionally geometrically shaped surfaces on the outer surface. The resulting locking force then results from a combination of elastically yielding force and geometrically provided shaping in the position of the fitting FIG. 5 ,

The movement is visible with its distance c, which consists between the thrust piece 11 and the horizontal leg 4b. It can vary between zero and the maximum distance in the closed state. The closed state is in the

FIG. 6 illustrated and here the thrust piece 11 has the largest distance from the horizontal leg 4b. The minimum distance c is zero and is in FIG. 5 shown in the open state.

The formation of the thrust piece 11 and the elbow 4 in the leg 4b illustrate the sectional view of FIGS. 7a, 7b , The width of these two elements 4, 11 is at the distance d of FIG. 1 customized. Two guide sections 11 ', 11 "engage laterally and the L-shaped profile sections 50a, 50b with respect to the thrust piece 11. Its height substantially corresponds to the height a50.

Likewise, two lateral webs 4b ", 4 'engage under the same profile sections 50a, 50b, with respect to the horizontal leg 4b of the angle 4. The height is also essentially the same here, in each case an intermediate section 11 * and 4b * lying between the two guide limbs the two components described.

The leg 4b also has a groove 40 facing the web portion 40 in which the hinge 14, for example, by a rivet head, can be accommodated.

The assembly was at the FIG. 4 seen. The thrust piece 11 is first inserted into the web portions 50a, 50b to be guided between them. Then the angle 4 with the described T-shaped training after Figure 7a also inserted into the same guide. Subsequently, the wing F with the bearings 8, 13 are mounted on the frame, or an associated plate, as the FIG. 5 illustrated.

In the FIG. 5 should be shown in the context of an overview of how the joints 13, 8 on the frame and 14, 7 work on the wing. The distance bb on the frame is much larger than the distance aa on the wing. The distance aa is less than one third of the distance bb. The drawn vertical axis 7a is defined by the towering pin of the short arm 6, so that the pivot bearing 7 has a vertical axis 7a. This vertical axis of rotation 7a is the pivot axis of the wing with respect to the short arm 6, but not the pivot axis of the wing with respect to the frame, which is opposite to this axis displaced and results in a mixture of rotational movement and lateral displacement movement.

Clearly visible is formed as a strip recording 40 in FIG. 5 in which a bearing 14 of the main link 12 is provided, which in turn is rotatably arranged on the bearing frame 13 on the frame plate. The
Drehlagerstelle 17 connects the second link to the thrust piece 11 at its in FIG. 5 to store downwards rotating end rotatable. The associated bearing 11 shifts but when closing the wing, while the thrust piece 11 in the guide 50 a, 59 b away from the angle 4. This is no direct, rigid and fixed by a metal part predetermined distance relationship from the bearing piece 11 given to the angle 4. Rather, this is achieved by means of two link sections of the two described links 9, 12, supported by the guide 50a, 50b. A retaining rail or retaining plate is therefore not required on the casement side. It is provided by the guide 50, 50a, 50b of the metal profile.

The thrust piece 11 is formed in its length larger than in its width so as not to tilt when pushed. Its plastic design favors the sliding properties without the need for separate lubrication.

In the closed state, the two mutually facing recesses 9c, 12c of the two links 9, 12 engage with each other and the oppositely extending cranks 9b, 12b allow changing the altitude of the crossing here in the rebate link. This intersection K is in the closed state in FIG. 6 drawn as it passes through the bow arrow K in FIG. 5 is clarified.

For closer execution of the T-shape after Figure 7a, 7b it can be pointed out that this is adapted to the respective profile geometry of the guide webs 50a, 50b. In most cases, the middle web 4b * is made thicker or thicker in order to provide sufficient stability for the angle piece 4 than the guide webs 4b ', 4b "laterally provided for engaging behind the L-shaped profile sections 50a, 50b. which is provided for the at least one further joint 14.

The height of the each in cross-section T-shaped piece 11 or 4 may be in the central region 4b *, 11 * to the height a50 of the profile sections 50a, 50b adapted as "guides", at least substantially.

The fixation of the horizontal leg 4b of the elbow 4 need not take place in the horizontal portion of the spar, but is preferably made in the vertical portion at a position of the vertical leg 4a, which lies above the thickening 4c. Here are two mounting holes 5 are provided, which allow a screw on the vertical wing spar, as shown by two correspondingly drawn pilot holes in FIG. 4 is recognizable.

If the vertical leg is screwed with appropriate mounting means, the horizontal leg 4b in the guide 50a, 50b is fixed in the longitudinal direction. Opposite him then the thrust piece 11 can be moved distance, but only in the longitudinal direction. In this longitudinal movement, the angular position of the two links 9, 12 relative to each other and the angular position of the main link 6, which takes over the weight transfer of the wing changes.

Claims (20)

Fitting to the pivot opening an opening member relative to a fixed frame (B) with an angle piece for mounting in the corner area (F1) of the casement (50) of a metal profile, on the side of the wing (F) or the wing (F) was covered side, Angle piece (4; 4a, 4b) has a first leg, a second leg substantially perpendicular thereto and a corner region between the two legs; (i) wherein in the corner region of the elbow, a receptacle for a pin (7) of a short, strong arm (6) is provided for rotatably supporting the elbow (4) relative to the short arm (6) about a vertical axis (7a) ; (ii) wherein the first leg (4b) of the angle piece (4) has a bearing point (14) spaced from the corner area for a further link (12) and one for insertion into or between profile webs (50a, 50b) of the sash frame (50) suitable or adapted cross section. Fitting according to claim 1, wherein the suitable for insertion cross-section of the first leg at least two edge webs (4b ', 4b "), suitable for engaging below angular profile webs (50a, 50b) of the sash. Fitting according to claim 1 or 2, wherein the first leg has a central web (4b *) having a height (in thickness / thickness) which substantially corresponds to the height of the profile webs extending to the rebate space (a50). Fitting according to claim 1, wherein a push or sliding piece (11) via at least one link (9,12) distance variable to the elbow (4) is coupled thereto, and wherein the thrust piece (11) corresponding to the first leg of the elbow for insertion between the profile webs (50a, 50b) of the sash is adapted or suitable. Fitting with thrust piece according to claim 4, mounted on a fitting with a plurality of links (6,9,12), wherein the thrust piece - in cross-section - a central portion (11 *) and at least two laterally projecting guide webs (11 ', 11 ") in order to grip under at least L-shaped profile webs (50a, 50b) of the casement and to be guided by these longitudinally displaceable. Fitting according to claim 1, wherein the first leg (4b) of the angle piece has a recess (40) pointing towards the casement, extending in the direction of the first leg, for receiving a mounting means, in particular a rivet head, about an articulation point (14) permitting at least pivoting movements. a further link (12) form on this leg. Fitting according to claim 1, wherein the second leg (4a) of the elbow in its end region mounting holes (5), for fixing and fixing the elbow on the vertical spar of the sash and thus for fixing fixing the horizontal first leg (4b) of the elbow on horizontal spar of the sash in the corner (F1). Fitting according to claim 1 or 7, wherein the second leg (4a) extending from the corner region has a reinforcement (4c), in particular a thickening, for the rotatable guidance of the pin (7) of the short arm (6). Fitting according to claim 1 or 4, wherein the first leg (4b) of the angle piece has a locking piece (11) directed locking receptacle (4d), in particular for receiving a Verrastungsnase (11b) on the thrust piece after approach of the thrust piece to the elbow. A method for rotatably coupling a wing (F) against a fixed or frame (B), wherein - In the corner of the wing, a rigid elbow (4, 4a, 4b) relative to the wing is immovable, but at least one arm (6,9,12) relative to the fixed frame (B) when opening or
is relatively moved when closing the wing; - A guide piece (11) during opening or closing of the wing its distance (c) relative to the angle piece (4) is relatively changed while being guided in one or between two profile section (s) (50,50a, 50b) of the wing. The method of claim 10, wherein the guide is a longitudinal guide, in particular formed as a sliding bearing. The method of claim 10, wherein the wing has a metal profile frame. The method of claim 10 or 11, wherein the guide piece (11) via at least one control link (9,12) with the angle piece (4) is coupled distance variable. A method according to claim 10 or 13, wherein no rigid connection between the guide piece (11) and the angle piece (4) is provided, in particular the guide piece is at a relative height substantially the height of the first leg (4a) of the angle piece ( 4) corresponds. The method of claim 10 or 14, wherein the guide piece is coupled only via links (9,12) with the angle piece. Method according to claim 10 or 15, wherein the guide piece (11) is operatively connected to the angle piece (4) via two links (9, 12) coupled to a pivot joint (17) and, in the event of a change in the angular position, to the link in its distance the angle piece is changed. The method of claim 16, wherein the two links (9,12) intersect in the closed space of the fitting in the rebate between the frame and sash and in the crossing region both links a crank (9b, 12b) and a mutually facing lateral recess (9c, 12c). exhibit. The method of claim 17 or 16, wherein one of the two links (9,12) is not hinged to the frame, in particular that handlebar (9), the guide piece (11) on its side facing away from the frame end portion - in the open position - carries , Elbow adapted and suitable for the corner (F1) of a metal wing frame (50) in the periphery of a turn-tilt fitting for guiding the movement of a wing relative to a fixed frame (B), wherein the fitting comprises the elbow (4) and
(aa) a short, strong handlebar (6);
(bb) at least one - compared to the short handlebar - longer
Handlebar (12); in which - The handlebars (9,12) at a first distance (bb) on the side of the non-movable fixed frame are pivotally mounted (8,13) and on the side of the angle piece (4; 4a, 4b) for mounting on the movable wing in one second distance (aa) are pivotally mounted (7,14) to the angle piece (4; 4a, 4b) relative to the fixed frame (B) to move relative and to pivot; - The angle piece (4; 4a, 4b) for reinforcement - at least in the region of the second distance (aa, 4b) - is formed in cross-section substantially T-shaped. Elbow according to the previous claim, wherein the T-shape has two lateral insertion webs (4b ', 4b ") and a thicker or thicker main web (4b *) opposite them; - The second distance (aa) is smaller than the first distance (bb), in particular a ratio of the two distances is less than one third; or - The elbow has two legs and to a thrust piece (11) facing leg (4 b) has substantially the same width as the thrust piece to insert both the leg and the thrust piece in or between profile sections (50 a, 50 b) of the casement or to be able to insert; or the T-shape also extends beyond the first distance (aa); - A substantially entire horizontal leg (4b) of the angle piece (4) is (substantially) T-shaped.

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