EP0046821B1 - Fittings for a sky-light - Google Patents

Abstract

1. Fitting for living-room attic windows comprising a casing (3) and a sash (2) hinged thereto and a torsional spring means for weight relieve, active between the frame (5) of the said casing and the frame (4) of said sash, characterized in that the torsional spring means consists of a least two torsion spring elements (25, 36) positioned inside a hollow profile (26, 35) and aligned to each other in an axial direction, said spring elements comprising a first abutment (29, 30, 10, 39, 40) positioned between them and connected to the frame of said casing, and that the outer ends of said torsion spring elements are connected to said frame of said sash, such that said torsion spring elements are rotable inside said hollow profile.

Description

The invention relates to a fitting for living room skylights with a feed box and hinged, hinged window sash and between the frame of the feed box and the frame of the window sash effective torsion spring device for weight relief.

The fittings for roof windows known to date are suitable either for so-called swing windows, hinged windows or sliding windows and combinations of these systems, for which the corresponding double-function fittings must then be provided. All of these types of windows each require special fittings which only permit the corresponding movement of the window sash, according to which these systems are named. After that it is e.g. It is not possible to make a so-called folding wing functional with a fitting for swinging wings, and a fitting for a folding wing is not suitable for a swinging wing. It is undeniable that all of these systems have certain advantages and disadvantages. For example, a swing wing can easily be cleaned from outside by swinging the wing into the interior of the room. A pure folding wing, on the other hand, can either not be cleaned from the outside at all or can only be cleaned from the outside with auxiliary tools. Attempts have therefore been made to combine the advantages of the folding wing with those of a swinging wing, so that the wing can be pivoted for cleaning and folded for ventilation. Folding sashes have also been fitted with sliding window fittings so that at least part of the window opening can be opened to clean the outside of the glass. Another combination is the so-called window door, which is mainly used as a roof hatch.

All of the aforementioned systems and their fittings require a hinge device on the upper edge of the window for folding, a lifting mechanism for lifting the wing in the folding position and an additional device for swinging or pushing the wing or, as with the French window, for rotating the door wing. Other fittings, as are known for example from DE-A Nos. 2631453 and 2725615, use a fitting with a gimbal-hung wing that can be folded as well as pivoted in the lateral direction. So-called parallel racks, as are known for example from DE-A No. 2425799, also require relatively complex devices in order to cope with the weight of the wing in the folded position.

Furthermore, DE-B No. 1584210 discloses a hinge with torsion coil springs for lids or flaps that can be pivoted about a horizontal axis, with torsion springs that can be adjusted in their preload, preload and spring characteristics being selected so that the lid holds straight in an intermediate position swings above and folds into the closed position below. Apart from the fact that such a characteristic is unusable for roof windows, the known construction is also not suitable for multi-function roof windows.

Furthermore, from FR-A No. 2064780 a construction for a roof hatch or floor hatch is disclosed with two torsion springs which would keep the hatch in the open position at all times. A security mechanism usually prevents this. A heat sensitive element, i.e. a fuse releases the safety mechanism when exposed to heat so that the hatch can open.

This construction is also unsuitable for multi-function roof windows.

The disadvantage of all these systems is the relatively expensive, complicated to manufacture and at least visible in the folding fittings. An attempt has therefore been made to use fittings which are arranged as concealed as possible. However, this requires correspondingly expensive inlet work on the wing or feed box and therefore unnecessarily large wooden cross sections. Such fittings are sometimes prone to failure (gas springs) and not always very reliable. Another disadvantage of the swinging wing or swinging swinging wing is the interruption of the sealing level on the swinging bearing. In addition, in the case of multi-function windows, switching from one function to the other often leads to difficulties and incorrect switching and thus damage to the fittings.

The invention has set itself the task of overcoming all these disadvantages with a relatively cheap, uncomplicated and amazingly simple construction and, moreover, of creating a fitting which is able to meet all requirements completely independently of the respective system. This object on which the invention is based is achieved in that, in the case of a fitting for roof windows of the type mentioned at the outset, the torsion spring device consists of at least two torsion spring elements which are arranged within a hollow profile and are aligned with one another in the axial direction and which have a common first abutment lying between these torsion spring elements is connected to the frame of the feed box, and that the outer ends of the torsion spring elements are connected to the frame of the window sash in such a way that the torsion spring elements can be rotated in the interior of the hollow profile.

Advantageously, the arrangement is designed such that a permanently effective braking device is provided between the hollow profile and the external fastening of the second abutment, which can be rotated inside the hollow profile, by the action of which the window sash is held independently of the opening angle and regardless of the respective force of the torsion spring elements that furthermore the torsion spring device consists of a U or square hollow profile which is fixed to one of the frames is connected that a torsion shaft is rotatably supported to a limited extent in the hollow profile, which in turn is at least non-positively connected to the respective other frame via at least one element that exerts a leverage effect, and that a number of torsion springs are provided within the hollow profile that wrap around the torsion shaft, on the one hand is firmly anchored to the torsion shaft and, on the other hand, rests firmly against an inner wall of the hollow profile which inhibits the rotation of the torsion springs.

It is particularly advantageous that the torsion spring device simultaneously forms the actual hinge of the roof window and preferably even essentially forms one leg of the lining frame or of the frame or window frame, the hollow profile being firmly connected to the other frame parts and also also to the Hollow section rigidly connected long torsion lever acts on the longitudinal spars of the frame in question, and that the torsion shaft acts on the longitudinal spars of the other frame via two short torsion levers.

A further preferred embodiment of the _I invention is characterized in that the torsion spring means consists of a hollow profile, is provided in which at least two, aligned with each other in the axial direction, consisting of at least one flat, elongated rod each torsion spring in Einspannschlitzen arranged in the hollow profile Einspannbuchsen are that the middle clamping bush lying between two torsion spring elements is firmly connected to the hollow profile, while the other clamping bushes are rotatably mounted in the hollow profile and are connected to the other frame via an operative connection.

Advantageously, the arrangement is such that each of the torsion spring elements consists of a number of parallel rods which are mounted in the clamping slots of the clamping bushes. Preferably, the hollow profile consists of a tube with a circular cross-section, in which the middle clamping bush lying between two torsion spring elements is fixedly connected to the pipe, while the outer clamping bush is rotatably mounted in the pipe and is fixedly connected to extension arms.

It is particularly advantageous if the external clamping bushes have a circumferential groove, into which a grub screw that can be screwed into a threaded bore of the tube engages as a safety and brake.

The invention will now be explained in detail by means of exemplary embodiments in conjunction with the accompanying drawings.

• Fig. 1 ein erstes Ausführungsbeispiel eines Dachfensters mit kardanischer Aufhängung des Fensterflügels und einem erfindungsgemäss aufgebauten Beschlag;
• Fig. 2 eine vergrösserte Teilschnittansicht von Fig. 1;
• Fig. 3 eine Prinzipdarstellung einer Verschlusssicherung, die mit dem erfindungsgemässen Beschlag zusammenzuwirken vermag;
• Fig. 4 Einzelheiten der Torsionsfedervorrichtung in der sogenannten Scherenausführung;
• Fig. 5 eine weitere Ausführungsform der Torsionsfedervorrichtung in der sogenannten Kardanausführung;
• Fig. 6 schematisch eine weitere Anordnung der erfindungsgemäss aufgebauten Torsionsfedervorrichtung an einem Dachfenster;
• Fig. 7 schematisch die Anordnung der Torsionsfedervorrichtung an einer Fenstertüre;
• Fig. 8 schematisch in einer Teilschnittansicht eine Torsionsfedervorrichtung gemäss einer weiteren Ausführungsform der Erfindung;
• Fig. 9 eine Querschnittansicht durch den Endabschnitt der Torsionsfedervorrichtung längs der Linie A-A in Fig. 8, und
• Fig. 10 schematisch eine Teilansicht der beispielsweisen Befestigung der erfindungsgemässen Torsionsfedervorrichtung an einem Wohndachfenster.

In the drawings:

• Figure 1 shows a first embodiment of a roof window with gimbal suspension of the window sash and a fitting constructed according to the invention.
• Fig. 2 is an enlarged partial sectional view of Fig. 1;
• 3 shows a basic illustration of a locking device which can interact with the fitting according to the invention;
• Fig. 4 details of the torsion spring device in the so-called scissors version;
• 5 shows a further embodiment of the torsion spring device in the so-called cardan design;
• 6 schematically shows a further arrangement of the torsion spring device constructed according to the invention on a roof window;
• 7 schematically shows the arrangement of the torsion spring device on a French door;
• 8 shows schematically in a partial sectional view a torsion spring device according to a further embodiment of the invention;
• Fig. 9 is a cross-sectional view through the end portion of the torsion spring device along the line AA in Fig. 8, and
• 10 schematically shows a partial view of the exemplary attachment of the torsion spring device according to the invention to a roof window.

Although in principle the fitting according to the invention can be used with a large number of skylights, roof windows and French doors, the new fitting should first be explained in connection with a skylight in which the window sash is connected to the feed box at only one point via a cardan joint is that the window sash can be raised and can also be pivoted laterally into a cleaning position around the gimbal bolt by slightly lifting it out of the gimbal bearing in a direction parallel to the sealing surface of the feed box.

1 shows such a roof window 1 with a window sash 2 and a feed box 3. The frame 4 of the window sash 2 and the frame 5 of the feed box 3 can be seen. A torsion spring device 6 constructed according to the invention is provided at the upper end of the frame 4 of the window sash. It is easy to see that this torsion spring device 6 can be designed in such a way that it partially, but preferably completely, replaces the frame leg of the window sash.

With the torsion spring device 6, a long torsion lever 7 and a short torsion lever 8 are provided in the exemplary embodiment shown, each of which is connected to the torsion spring device on both sides, as will be explained in more detail below.

On the frame 5, a gimbal block 9 is attached, in which a gimbal pin 10 is slidably mounted, which carries at its lower end a plate 11 which serves as an abutment for a compression spring 12 lying between the plate 11 and gimbal block 9. The gimbal pin 10 is, as will be explained in more detail, connected to the torsion spring device 6. Furthermore, a locking device 13 is provided which has an operating lever 14 which is in a position for Folding, a position for the closed window and a position for pivoting in the cleaning position can be changed. In the normal state, a locking pin 15 prevents the locking lever from being turned into the pivoting position. The securing lever 14 can be pivoted via a square shaft 16 and a bracket 17 in such a way that a guide pin 19 attached to the bracket 17 is able to slide along a guide track 18.

As can be seen in detail from FIG. 3, this operating lever 14 can be used to firmly connect the window sash to the feed box, the feed box can also be separated from the window sash and, after the locking pin 15 has been pressed in, the operating lever 15 can be moved into the pivoted position, whereby the long torsion lever 7 comes free from the feed box and is locked with the window sash. In the idle state or when folding, however, the long torsion lever 7 rests with an abutment pin 20 on an abutment 21 and is thus fixed on the feed box. The long torsion lever 7 also has a locking groove 22, which comes into effect when it is snapped onto the wing.

From Fig. 2 you can first see some details of the torsion spring device 6 to be described in more detail. One can first see a torsion shaft 23 and a torsion spring 24 lying thereon and wrapping around it, which is inserted at one end into a bore 25 of the torsion shaft 23 while it is being used the other end rests on the inside of a hollow profile 26. This spring is essentially subjected to torsion, i.e. a twist in wire cross section. So this is a torsion bar spring or torsion spring. A brake screw 27, the cardan bolt 10 and the side rails 32 and 33 can also be seen.

4, the torsion spring device according to the invention is shown in detail. One can again see the torsion shaft 23, the torsion springs 24 mounted thereon, which are inserted at one end into a bore 25 of the torsion shaft 23. This torsion shaft 23 with the torsion springs 24 is located inside a U-profile or preferably hollow profile 26 with a square cross-section and an outer bearing bush 28 inserted therein and an inner continuous bearing bush 29. Furthermore, it can be seen that the torsion shaft 23, which is in principle for all others Constructions consist of a continuous shaft, for the use of gimbaled window sashes basically consists of two parts, which are aligned and guided with each other via the inner bearing bush 29.

It can also be seen that the cardan bolt 10 is inserted into the bearing bush 29. In addition, it can be seen that the long torsion lever 7 is welded to the torsion shaft 23, while the short torsion lever 8 is welded to the hollow profile 26. It can also be seen in connection with FIG. 1 that the torsion shaft 23 is connected to the chuck or feed box, while the hollow profile 26 is connected to the window sash via the short torsion lever 8 and screwed there.

Fig. 5 shows a similar construction with a hollow profile 26 with internal torsion shaft 23 and torsion springs 24 mounted thereon, which are in turn inserted into bores 25 of the torsion shaft 23 and each rest with their other ends on the inner wall of the hollow profile 26. The short torsion levers 8 are firmly welded to the hollow profile 26 here. The inner ends of the torsion shaft 23 are fixedly connected to this bearing bush by pins 30 within the bearing bush 29. The gimbal bolt 10 is in turn inserted into this. In this case, the cardan bolt 10 serves as the second torsion lever and thus enables the window to be opened.

6 shows a somewhat modified embodiment of how the torsion spring device 6 constructed according to the invention can be used. The same parts are again provided with the same reference numerals and require no further explanation. In this case, the torsion spring device 6 is attached to the lower end of the feed box and can also be fully integrated in the frame.

The short torsion levers 8 are in turn screwed onto the feed box, while the long torsion levers 7 now take over the function of raising arms. Of course, the arrangement could be built upside down, i.e. the torsion spring device 6 could be attached to the window sash and the long torsion levers 7 acting as extension arms could be operatively connected to a corresponding guideway on the feed box.

Fig. 7 shows a French window with a window sash 31, the remaining parts being provided with the reference numbers already used.

This new fitting now has a number of advantages.

First, the principle of the torsion bar or torsion spring is used to balance the weight of the window sash in the folded position. This completely maintenance-free spring principle can be integrated into the frame construction without any milling on the window sash or lining of the window in such a way that the torsion spring device 6 is attached instead of a frame leg that is necessary per se. Due to its special construction in conjunction with the material (steel) used for this, it is able to save a frame leg completely and also to stabilize the frame, so that this alone makes a significant saving in material and processing possible, and beyond the stability and thus the quality of the frame is significantly improved.

Such a torsion spring device can be used as desired on the window sash or lining as an upper or lower wide leg, and as a side leg for French windows can be used universally regardless of the window system. The special construction of the torsion spring device can be precisely adapted to the respective window sash or lining profile by using a preferably square tube as a hollow profile, and can therefore be accommodated completely invisibly as a fitting part. On the upper frame, and attached to one of the two sides of the frame on French doors, the torsion shaft in connection with the square tube not only serves in its normal function as a bearing and abutment for the torsion spring or torsion springs, but ideally also as a hinge for the window, whereby either the square tube or the torsion shaft with the torsion levers 7, 8 additionally takes on the function of a hinge band or that of a hinge block. This also saves these essential components of a normal window fitting. The optional attachment of the fitting, depending on the system, outside or inside the window avoids the interruption of the sealing level and results in an optimal opening width of the window sash in the folding position.

Another advantage compared to a normal torsion spring bar, which is possible per se, results from the use of normal spiral springs if they are attached to one another in succession on a torsion shaft such that each of these springs transmits its force to the shaft independently of the other spring or springs, so that - Depending on the number of turns and wire thickness or diameter of the winding - depending on the width of the window and thus the length of the spring shaft, arbitrarily large forces can be transmitted or generated. In contrast to a normal torsion bar, this results in a multiplication of the forces on the torsion shaft without changing the dimensions of the length or thickness of the bar, simply by lining up the same springs.

This significant advantage over a normal torsion bar has the consequence that with the parts which are completely identical in terms of cross section, forces of any size can be achieved only by lengthening the tube or the spring shaft with any number of springs.

By increasing the number of turns, an arbitrarily large twist angle can be achieved, and by using a larger wire thickness or a smaller spring diameter, the force of the individual torsion spring can be increased many times without losing elasticity.

The additional installation of a brake, which acts on the torsion shaft, enables the force to be individually adjusted depending on the roof pitch as well as the weight or spring force compensation so that the sash remains in any desired opening position.

A further preferred embodiment of the invention is shown in FIGS. 8 to 10.

8 shows, purely schematically, a partial sectional view of the torsion spring device 34 constructed according to the invention, which contains two torsion spring elements 36 and 37 in a hollow profile, here a tube 35 with a circular cross section. Although only two torsion spring elements are shown in this embodiment, it is in principle possible to provide more than two such torsion spring elements, axially aligned with one another. While an odd number of torsion spring elements is also conceivable, it is preferable to provide an even number, preferably two, of such torsion spring elements for a symmetrical distribution of the forces. Each of these torsion spring elements 36, 37 consists of at least one, but preferably a plurality of flat, elongate rods 38, preferably made of band spring steel, which are clamped parallel to one another and touching one another in clamping bushes. For this purpose, a central bushing 39 with clamping slots 40 and 41 is provided. However, it is quite equivalent to use rods made of round material instead of the flat material (strip steel). If desired, better elasticity is obtained. In this case, the clamping bushes would have a corresponding number of preferably circularly arranged bores. The clamping bush 6 has a bore 42, into which a retaining bolt 43 is inserted, which penetrates the outer wall of the hollow profile 35, here the pipe 35, and thus secures the clamping bush 6 against rotation in the pipe.

Furthermore, at the outer ends (only the right outer end is shown), clamping bushes 44 are provided, which have a clamping slot 45, into which the rod or rods is or are inserted. This clamping bush 44 is rigidly connected to an extension arm 46, preferably welded, and is rotatably mounted in the tube 35. In the embodiment shown here, the clamping bush 44 has a circumferential groove 47 into which a grub screw 48 engages, which is screwed into a threaded bore of the tube 35. This grub screw serves on the one hand as a safeguard against pulling out the clamping bush 44, but on the other hand also as a brake if it is tightened to such an extent that it grinds on the groove base of the groove 47.

To explain the mode of operation of this spring, it should be pointed out that each of the rods provides its own share of the total spring force generated. The spring force to be applied can thus be determined by the number of rods forming the torsion spring element and by their width and thickness and by their material properties. The twist shown in FIG. 8 will be discussed in more detail.

9, the same parts are provided with the same reference numerals. The tube 35 can again be seen with the clamping bush 44 rotatably mounted therein with its clamping slot 45 and the bars 38 forming the torsion spring element 36.

Fig. 10 shows purely schematically the attachment of the new torsion spring device, preferably on the lining box of a roof window. A bearing 49 is attached to the schematically shown wing 50, on which the extension arm 46 is articulated. As shown in FIG. 8, this extension arm 46 is firmly connected to the clamping bush 44, preferably welded. A plurality of mounting brackets 52 (only one is shown) are provided on the feed box 51 and are fastened with the aid of wood screws 53. In this case, the pipe 35 is preferably welded to the mounting bracket 52.

During assembly, the initially completely flat flat bars 38 are inserted individually or as a plate pack into the corresponding clamping slots 40, 41 and 45, as required. The clamping bush 39 is fastened in the tube 35 with the aid of the holding bolt 43. It can be seen that no forces are required for assembly. After assembly, the tube 35 is clamped and the extension arm (s) 13 connected to the clamping bushes 11 is rotated until a permanent deformation of approximately 90 to 180 ° has been achieved. Such a rotation by 180 ° is shown in the drawing. It has been shown that the spring forces can be transmitted most effectively from this position. It is practically impossible to overtighten this type of torsion spring, i.e. exceed their maximum allowable load.

You can immediately see that this type of construction enables an amazingly simple assembly that eliminates the torsion shaft.

Nevertheless, it can be achieved that relatively large forces can be achieved according to the number and dimensions of the rods used here; because the effects of the individual spring elements, i.e. in the present case the individual flat elongated rods are added. This is the basic principle of this new type of torsion spring device, by means of which all the forces ever required in practical operation can be achieved in the simplest way.

This further preferred embodiment of the invention additionally has a very significant advantage. While the torsion spring elements described in connection with FIGS. 1, 2, 4 and 5, namely the torsion springs 24 clamped in the torsion shaft 23, are not in the opposite direction, i. from its rest position in the opposite direction, and may, which would also not be possible in the example shown, a spring element 36 consisting of one or more rods 38 can, for example, once it has assumed the permanent deformation shown in FIG. 8 by 180 °, can be rotated both in one and in the other direction of rotation as a torsion spring device. This has e.g. of great importance for a roof window according to DE-A No. 2425799, if the window sash of a roof window shown there is equipped with a torsion spring device constructed according to this further exemplary embodiment of the invention and is raised in the parallel position. Then, in this already known roof window, the window sash could easily be moved into the cleaning position, but this corresponds to a rotation of the torsion spring elements in a direction of rotation opposite to the lifting movement of a folding or swinging sash.

Claims (15)

1. Fitting for living-room attic windows comprising a casing (3) and a sash (2) hinged thereto and a torsional spring means for weight relieve, active between the frame (5) of the said casing and the frame (4) of said sash, characterized in that the torsional spring means consists of a least two torsion spring elements (25, 36) positioned inside a hollow profile (26,35) and aligned to each other in an axial direction, said spring elements comprising a first abutment (29, 30, 1 0, 39, 40) positioned between them and connected to the frame of said casing, and that the outer ends of said torsion spring elements are connected to said frame of said sash, such that said torsion spring elements are rotable inside said hollow profile.

2. Living-room attic windows according to Claim 1, characterized in that, between said hollow profile (26, 35) and the external fastening means of the second abutment rotable inside said hollow profile, a permanently active braking means is provided under whose influence the sash is held in place irrespective of the opening angle and irrespective of the respective force of the opening elements.

3. Living-room attic windows according to Claims 1 or 2, characterized in that on either side of the abutment common to the torsion spring elements an identical number of torsion spring elements (24, 37) are provided, whose external abutments are in each case operatively connected to one frame and whose internal abutments are in each case operatively connected to the other frame.

4. Fitting for living-room attic windows according to Claim 1, characterized in that the torsion spring means (6) consists of a square hollow profile (26) acting as an abutment and which is permanently connected to one of the frames (4, 5), that inside said hollow profile (26) a torsion shaft (23) is mounted to be finitely rotable (28, 29), said torsion shaft (23) being at least positively connected to the respective other frame through at least one element (7, 10) acting as a lever, and that inside said hollow profile (26) an even number of torsion springs (24) are provided surrounding said torsion shaft (23), said torsion springs being permanently fixed to said torsion shaft (23) on the one hand and, on the other hand, firmly resting against an inner wall of said hollow profile (26) stopping the rotation of said torsion springs.

5. Fitting according to Claim 4, characterized in that the torsion shaft consists of two parts whose two ends are rotably mounted in bushes (28, 29) inside said hollow profile, wherein the inner bushes are connected to a cardan pin (10) which is slidably mounted in a guide block positioned on the frame of the casing and which is held in place by a disc (11) and by a pressure spring (12) positioned between disc and guide block (9).

6. Fitting for living-room attic windows, characterized in that said torsion spring (6) simultaneously forms the actual hinge of said attic window, that for this purpose said hollow profile (26) is permanently connected to the respective frame bar (4 and 5 respectively) acting on the longitudinal bars (32, 33) of the respective frame (4 and 5 respectively) through first torsion levers (8) also permanently connected to said hollow profile, and that said torsion shaft (23) positively acts on said longitudinal bars (33 and 32 respectively) of the other frame (5 and 4 respectively).

7. Fitting according to Claims 4 and 5, characterized in that said torsion spring means (6) simultaneously forms the actual hinge of said attic window, that for this purpose said hollow profile (26) is permanently connected to the hinge-side frame bar of the sash acting on the longitudinal bars (32) through short torsion levers permanently connected to said hollow profile, that furthermore said torsion shaft, consisting of two sections and rotably mounted inside said hollow profile (26), is permanently connected to said cardan pin at the inner bush, said cardan pin forming an element acting as a lever on said torsion shaft (23) and thus on said torsion spring whose other ends rest against an inner wall of said hollow profile.

8. Fitting according to Claim 4, characterized in that said torsion spring means (6) simultaneously forming the hinge substantially forms one leg of the respective frame.

9. Fitting according to Claim 2, characterized in that a braking screw (27) penetrating said hollow profile (26) is provided which for arresting the sash (20) in an arbitrary position directly or indirectly exerts a braking function on said torsion shaft (23).

10. Fitting for living-room attic windows according to Claim 1, characterized in that the torsion spring means (34) comprising at least two axially aligned torsion spring elements (36, 37), each consisting of at least one flat elongated bar (38), said torsion spring elements (36, 37) being positioned in clamping slots (40, 41, 45) of clamping bushes (39, 44) positioned in said hollow profile (35), that the center clamping bush (39) positioned between two torsion spring elements (36, 37) is permanently connected to said hollow profile (35) while the other clamping bushes (44) are rotably mounted in said hollow profile (35) and are operatively connected to the respective other frame (50, 51).

11. Fitting according to Claim 10, characterized in that each of said torsion spring elements (36, 37) consists of an identical number of parallel bars (38), mounted in the clamping slots (40, 41,45) of said clamping bushes (39,44).

12. Fitting according to Claim 11, characterized in that each torsion spring element (36, 37) consists of an identical number of bars of round material, which are mounted in the clamping bushes in a corresponding number of preferably circularly arranged bores.

13. Fitting according to Claim 10, characterized in that said hollow profile is a tube (35) with a circular cross-section, that the center clamping bush positioned between two torsion spring elements is permanently connected to said tube and that the outer clamping bushes (44) are rotably mounted in said tube and are permanently connected to opening arms (46).

14. Fitting according to Claim 13, characterized in that said outer clamping bushes (44) are provided with a circumferential groove (47) engaged by a screw (46) which is screwed into a threaded bore in said tube and which acts as a safety and braking means.

15. Fitting according to Claims 1 to 5, characterized in that said torsion spring elements (36,37) in the assembled state are tensioned by being twisted.

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