EP0965699B1 - Device to slidably mount an article, in particular a shower head on a shower bar - Google Patents

Abstract

A clamp device is provided comprising a clamp component for fixing the housing to the support bar (4) by means of a clamp connection and under the influence of spring force (18). For release of the clamp connection, an operating component (20) is provided. The clamp component is a clamp ring (17) flexible in a radial direction and intended for accommodation of the support bar (4). At least one tension ring (19a,19b) engages externally on the clamp ring.

Description

The invention relates to a device specified in the preamble of claim 1 Genus.

A known device of this type (DE 41 06 878 A1) has a housing that contains a substantially U-shaped clamping element and thus at the same time as part a clamping device is formed. The clamping element has two legs that by means of an arc section comprising the support rod by more than 180 ° with one another are connected. The clamp also includes a spring that the two Legs to establish a clamp connection with the support rod against each other suppressed. The control element serves the purpose of the two legs if necessary Loosen the clamp connection to spread.

An undesirable problem with this device is that when spreading the Both legs have comparatively large opening gaps, through which liquids and penetrate contaminants contained therein into the interior of the sliding body can, which should be largely avoided for hygienic reasons. Moreover The spring must bias the housing as a whole into the clamping position, so that To achieve a high clamping force, a comparatively large spring force is required which acts as a counterforce when operating the operating element and its light Usability hindered.

In another device of the type described in the introduction (DE 35 07 290 A1) the clamping device a clamping disk protruding through a narrow gap in the housing on. This largely avoids opening gaps, but is effective Area of the clamping plate required an undesirably large surface pressure, which in In extreme cases, damage to the support rod and decreasing clamping forces and unfavorable tilting moments. The same applies to other known, with clamping washers or the like. Provided devices (FR 24 15 446 A1).

Furthermore, devices are known (De 18 39 393 U1) in which between one Support rod and a sliding sleeve on this sliding sleeve made of rubber or Plastic is used. With such a passively acting clamping ring, however, can no large clamping forces are applied.

Finally, devices are known (DE 27 42 112 C2) in which the clamping force is produced by means of a screw, which is because of the manipulations required thereby is undesirable.

In contrast, the invention is based on the object of the device designated genus so that with small spring forces and surface pressure large clamping forces are achieved and disruptive opening gaps can be avoided.

The characterizing features of claim 1 serve to achieve this object.

Further advantageous features of the invention also emerge from the subclaims.

Fig. 1 eine bevorzugte Vorrichtung an einer vertikal angeordneten Tragstange und in einer perspektivischen Darstellung;

Fig. 2 eine schematische Darstellung der wesentlichen Einzelteile der Vorrichtung nach Fig. 1 in einer perspektivischen und auseinandergezogenen Ansicht und in einem verkleinerten Maßstab;

Fig. 3 und 4 in perspektivischen, gegenüber Fig. 1 etwas vergrößerten Darstellungen die Verbindung von zwei Achsenteilen der Vorrichtung miteinander;

Fig. 5 eine Draufsicht auf einen Klemmring der Vorrichtung nach Fig. 1 und 2;

Fig. 6 eine Draufsicht auf einen Spannring der Vorrichtung nach Fig. 1 und 2;

Fig. 7 eine perspektivische Darstellung des Klemmrings nach Fig. 5 nach dem Einsetzen in den Spannring nach Fig. 6;

Fig. 8 einen Querschnitt durch eine aus dem Klemmring nach Fig. 5, den beiden Spannringen nach Fig. 2 bzw. 6 und einer Feder nach Fig. 2 gebildenten Klemmvorrichtung etwa längs einer Linie VI-VI der Fig. 10;

Fig. 9 eine Einzelheit IX der Fig. 8 in Vergrößerung;

Fig. 10 einen Schnitt längs der Linie X-X der Fig. 8;

Fig. 11 einen Vertikalschnitt längs der Linie XI-XI der Fig. 1;

Fig. 12 einen Schnitt längs der Linie XII-XII der Fig. 11; und

Fig. 13 und 14 zwei unterschiedliche Betriebszustände der Vorrichtung nach Fig. 1 in Schnitten längs der Linie XIII-XIII der Fig. 12.

The invention will be explained in more detail in connection with the accompanying drawings of a preferred embodiment. Show it:

Figure 1 shows a preferred device on a vertically arranged support rod and in a perspective view.

FIG. 2 shows a schematic illustration of the essential individual parts of the device according to FIG. 1 in a perspective and exploded view and on a reduced scale;

3 and 4 in perspective, somewhat enlarged representations compared to FIG. 1, the connection of two axis parts of the device to one another;

5 shows a plan view of a clamping ring of the device according to FIGS. 1 and 2;

6 shows a plan view of a clamping ring of the device according to FIGS. 1 and 2;

FIG. 7 shows a perspective illustration of the clamping ring according to FIG. 5 after insertion into the clamping ring according to FIG. 6;

8 shows a cross section through a clamping device formed from the clamping ring according to FIG. 5, the two clamping rings according to FIGS. 2 and 6 and a spring according to FIG. 2, approximately along a line VI-VI of FIG. 10;

FIG. 9 shows a detail IX of FIG. 8 on an enlarged scale;

Fig. 10 is a section along the line XX of Fig. 8;

Fig. 11 is a vertical section along the line XI-XI of Fig. 1;

Fig. 12 is a section along the line XII-XII of Fig. 11; and

13 and 14 two different operating states of the device of FIG. 1 in sections along the line XIII-XIII of FIG. 12th

1 and 2, the device contains a housing 1 with a an axis 2, usually cylindrical passage 3. The passage 3 is used to hold a support rod 4, which can also be tubular essentially corresponding to the inner cross section of the passage 3, as a rule has a circular outer cross-section and comes to lie coaxially with the axis 2, so that the housing 1 is displaced in the direction of the axis 2 and, if necessary, in the circumferential direction the support rod 4 can be rotated.

The housing 1 has two bearing disks 5 and 12 projecting transversely to the axis 2 and laterally 6 on that for the rotatable mounting of a substantially cylindrical, from two axis parts 7a and 7b (Fig. 2) composite bearing axis 7 are used. The one points Axle part 7a at one end a usual, e.g. with a conical opening provided receptacle 8 for the object to be held, in particular the handle of a hand shower, not shown, while the other axis part 7b at one end a cover plate 9 is provided. One axis part (e.g. 7b) is preferably as Hollow cylinder, the other axis part (e.g. 7a) designed as a cylindrical bolt, the 3 and 4 can be used telescopically in the hollow cylinder. The Axle part 7a is also provided on the circumference with at least one cam 10, while the axle part 7b at least one suitable for receiving the cam 10 Axially parallel slot 11, which is angled at the rear end with an L-shaped Recess 12 is provided. The axis part 7a can therefore with the in the slot 11th protruding cam 10 ahead (Fig. 3) in the axis part 7b and so far in this be advanced until the cam 10 is at the level of the recess 12. By a The cam 10 can rotate the axis part 7a slightly relative to the axis part 7b then be inserted into the recess 12 (Fig. 4), causing the two axis parts 7a, 7b are axially connected to one another by a type of bayonet lock. to Securing the connection against unwanted loosening has the axle part 7b on one End of the slot 11 on this covering, resilient tongue 14, which at Inserting the cam 10 into the slot 11 from one at the front end of the cam 10 inclined surface 15 is raised. After the cam 10 then into the recess 12 is inserted, the tongue 14 springs back again. It prevents or at least then it is difficult to turn back the cam 10. Depending on the design of the Cam 10 and the tongue 14, the connection as a detachable or non-detachable connector be carried out. Instead of the slot 11 and the recess 12 can also appropriate grooves may be provided. In the interconnected state of the axis parts 7a, 7b (Fig. 4) corresponds to the length of the bearing axis 7 between the receptacle 8 and the cover 9 essentially the distance measured on the outside two bearing washers 5 and 6.

The housing 1 is attached to the support rod 4 with a Provide clamping device, the function of which is explained below. 2 the clamping device has a clamping element in the form of a clamping ring 17, an outside on this acting clamping means and a spring 18, the clamping means preferably from at least one clamping ring surrounding the clamping ring 17 and after a particularly preferred embodiment of two, essentially identical clamping rings 19a, 19b. Here, the clamping ring 17 comes in descriptive to lie coaxially in the passage 3, so that he the support rod 4 in takes up or encloses from the outside and in its normal clamping position Housing 1 fixed to the support rod 4. An operating element is used to release the clamp connection 20 provided, which is preferably an operating lever 21 and one one end of which has a sleeve 22 with two end walls 23, the Sleeve 22 with these end walls 23 arranged between the two bearing plates 5 and 6 can be and then fits closely to them. The bearing washers 5, 6 and the end walls 23 each have openings 5a, 6a and 23a, which, when the Sleeve 22 are arranged coaxially to each other.

2, 5 and 7 show in particular, the clamping ring 17 is in the radial direction flexibly formed by choosing from a plurality of e.g. there are six pressure pieces 24, which are spaced in the circumferential direction and by flexible elements 25 in the form of thin, material strips arranged in a loop are connected to one another. On the inside the pressure pieces 24 each have clamping surfaces 26 which correspond to the Outer jacket of the support rod 4 to be accommodated are curved and e.g. on a Cylinder surface. On the outer circumference, however, the pressure pieces 24 are first Wedge surfaces 27 are provided, which are preferably roof-shaped and in the circumferential direction alternately increasing radially outwards or decreasing radially inwards Have areas. For this purpose, the pressure pieces 24 have e.g. essentially triangular cross-sections, the base surfaces being formed by the clamping surfaces 26 are. In addition, the wedge surfaces 27 are expedient by lying in their central planes, radially protruding bearing webs 28 each divided into two halves, so that the Bearing webs 28 each have an upper and lower row of first wedge surfaces 2 and 7 in particular. The clamping surfaces 26 limit in the relaxed State of the clamping ring 17 a passage 29 (Fig. 5), the cross section of which is essentially corresponds to the cross section of the support rod 4 or the passage 3 of the housing 1.

The clamping ring 19a shown in FIG. 2 is in particular also from FIGS. 6, 7 and 10 seen. Then it contains a support shoulder 30 in a lower region (FIG. 2, 10), which encloses a passage 31, the cross section of which is essentially that of Support rod 4 corresponds. A wall section 32 protrudes from this support shoulder 30 (FIG. 2, 10) coaxially upwards, the second on its inner circumference, through radial recesses formed and this laterally delimiting wedge surfaces 33 which substantially complementary to the first wedge surfaces 27 and therefore preferably roof-shaped and also with radially rising or falling radially inward Areas are provided. The second wedge surfaces 33 have a height in the axial direction on, which is essentially the height of the two rows of first wedge surfaces 27 on both sides the bearing webs 28 correspond, while the inner circumference of that of the second wedge surfaces 33 formed outer surface substantially the outer circumference of that of the first Wedge surfaces 27 formed outer shell of the clamping ring 17 corresponds. This allows the 7 are inserted from above into the clamping ring 19a, until its bearing webs 28 on an upper end face 34 (FIGS. 6, 7, 10) of the clamping ring 19a rest and the pressure pieces 24 are arranged within the wall section 32, that the lower row of the first wedge surfaces 27 in the of the second wedge surfaces 33rd limited recesses. The upper row of first wedge surfaces 27 projects accordingly Fig. 7 beyond the upper end face 34 of the clamping ring 19a. The outer circumference the clamping ring 19a is preferably essentially cylindrical.

In this respect, the second clamping ring 19b (FIG. 2) is essentially identical to the first Clamping ring 19a formed. It can therefore, as indicated in Fig. 2, in a 180 ° rotated arrangement on the upper row of the in Fig. 7 freely from the clamping ring 19a protruding wedge surfaces 27 are placed until its lower end face 35 (Fig. 2) on the opposite to the position of the end face 34 of the clamping ring 19a Side of the bearing webs 28 rests, as best seen in the sectional views according to FIG. 8 and 10 can be seen.

The two clamping rings 19a, 19b each have an essentially radially projecting arm 36 or 37, which is provided with an opening 38, 39 for receiving the bearing axis 7 and is designed like a shell. In the assembled state of the two clamping rings 19a and 19b (FIGS. 8 to 10), the clamping ring 17 and the two clamping rings 19a, 19b lie coaxially with one another. On the one hand, the two clamping rings 19a, 19b are arranged rotatably relative to one another and relative to the clamping ring 17, while on the other hand the two arms 36, 37 face one another with the open parts of their shells at a short distance. On the bottoms of the arms 36, 37, the ends of the spring 18, which is designed as a compression spring, are supported (FIGS. 2 and 8), as a result of which the arms 36, 37 are biased into an expanded position. So that the spring 18 cannot bring about an arbitrarily large spread of the arms 36, 37, the clamping rings 19a, 19b are provided on their end faces 34, 35 with axially protruding, circumferentially extending, comb-like wall sections 41, 42, which are provided from both sides when the two clamping rings 19a, 19b are fitted onto the clamping ring 17 so that, depending on the rotational position of the two sections 19a, 19b, they either form comparatively wide gaps 43 (FIGS. 8, 9) or abut along fine joints 44 and then one make further rotation impossible. In the normal position caused by the spring 18, the tension ring 19a is biased in the direction of an arrow v (FIG. 8) and the tension ring 19b in the direction of an arrow w . Overall, the arrangement is preferably such that both clamping rings 19a, 19b can be made completely identical.

The assembly of the entire device can be according to a particularly preferred one Embodiment of the invention by simply plugging the different parts together and without using any tool, as follows with reference to FIG. 1 to 10 is explained. The arrows shown in Fig. 2 each indicate the joining directions of the different parts.

E.g. first the two clamping rings 19a, 19b from opposite sides put on the clamping ring 17 (Fig. 7 to 10), with the spring 18 between the arms 36, 37 is arranged. The unit thus obtained is with the clamping rings 19a, 19b ahead in a correspondingly dimensioned, on the front of the housing 1 and between the bearing arms 5, 6 formed opening 46 (Fig. 2) and so far advanced until the passages 3, 29 and 31 are arranged coaxially. Here is the Length of the arms 36, 37 of the clamping rings 19a, 19b selected so that their openings 38, 39th are now arranged coaxially to the openings 5a, 6a of the bearing arms 5, 6.

The control element 20 is now approximated to the housing 1 in such a way that the two End walls 23 of the sleeve 22 enter the area between the bearing arms 5, 6 and at the same time, a recess 47 formed in the jacket of the sleeve 22 (cf. in particular 11) the two arms 36, 37 of the clamping rings 19a, 19b. It is the arrangement such that the one end wall 23 between the associated bearing plate 5 and the arm 36 and the other end wall 23 between the associated bearing plate 6 and the arm 37 comes to rest and in the end position also the openings 23a are aligned coaxially with the openings 5a, 6a and 38, 39, as in particular FIG. 12 show to 14.

Finally, from the outside of the two bearing disks 5, 6, the two Axle parts 7a, 7b inserted into openings 5a, 6a, 23a and 38, 39 until the receptacle 8 abuts on the bearing plate 5 and the cover plate 9 on the bearing plate 6, whereby the two openings 5a, 6a are covered to the outside. Can in this state the axis parts 7a, 7b by a slight relative rotation in the reference to FIG. 3rd and 4 described way are axially connected to each other, whereby without application an additional fastener such as a screw or the like. the finished 1 is formed. The plug or bayonet connection thus produced can for complete disassembly of the device by executing the various movements can be solved in reverse order. In addition, the assembly optionally done so that most often with a conical receiving opening provided receptacle 8 is arranged left or right in Fig. 1.

The device described with reference to FIGS. 1 to 10 works as well as FIGS. 11 to 14 show something like this:

In the relative position of the two clamping rings 19a, 19b shown in FIGS. 8 and 9, caused by the spring 18, the wedge surfaces 33 of the clamping ring 19a act in the direction of the arrow v and the corresponding wedge surfaces of the clamping ring 19b in the direction of the arrow w on those between them parts of the wedge surfaces 27 of the clamping ring 17. Because of the wedge surfaces 27, 33 which run obliquely to the respective radii, the pressure pieces 24 are therefore prestressed radially inward in the direction of the axis 2 (FIG. 1) under elastic prestressing and deformation, so that their clamping surfaces 26 in the example from FIG 13 against the support rod 4 as shown. In FIG. 9, the offset position of the wedge surfaces 33 of the clamping rings 19a, 19b relative to the wedge surfaces 27 and pressure pieces 24 is thereby indicated by lines 48 and 49, respectively. Because of the plurality of pressure pieces 24 and the relatively large clamping surfaces 26, a high clamping force can be obtained with comparatively low surface pressures and with a correspondingly low force of the spring 18.

If the device can be moved or rotated on the support rod 4, the arms 36, 37 (FIG. 8) are pressed together against the force of the spring 18 (FIG. 14), as a result of which the clamping rings 19a, 19b against the arrows v or w are rotated until the wedge surfaces 33 indicated by the lines 48, 49 in FIG. 9 or the recesses of the clamping rings 19a, 19b delimited by them lie exactly one above the other. The pressure pieces 24 can spring back radially outwards under the influence of the flexible, resilient elements and fully enter these recesses. This radial movement is possible in particular because in the clamping position shown in FIG. 13 there is sufficient air between the pressure pieces 24 or their bearing webs 28 and the wall sections 41 and 42 surrounding them from the outside and in the position of the clamping rings 19a, 19b described whose clamping surfaces 33 no longer act on the clamping surfaces 27 of the clamping ring 17. A comparison of FIGS. 13 and 14 also shows that in the clamped position (FIG. 13) the gaps 43 or joints 44 are located where in the released position (FIG. 14) the gaps 44 or gaps 43 are located and vice versa , The respective end positions are obtained by the wall sections 41, 42 acting as stops.

The relative rotation of the clamping rings 19a, 19b is brought about with the aid of the operating member 20, the actuating lever 21 of FIG. 11 being arranged essentially parallel to the axis 2 (cf. also FIG. 1) and which is shown as a solid line in the direction of a double arrow x Position can be pivoted to either side in a position 21a, 21b shown in dashed lines, the sleeve 22 is rotated about the bearing axis 7. The conversion of this swiveling or rotary movement into a rotary movement of the clamping rings 19a, 19b takes place, for example, with the aid of third wedge surfaces 50 formed on the arms 36, 37 of the clamping rings 19a, 19b (for example FIGS. 2, 6, 7, 13, 14). and fourth wedge surfaces 51 (FIGS. 13, 14) formed in the end walls 23 of the sleeve 22. The wedge surfaces 50 act in the normal clamping position of the clamping rings 19a, 19b brought about by the spring 18 on the wedge surfaces 51 on the sleeve 22 in such a way that the actuating lever 21 is biased into its central position according to FIG. 11. If, on the other hand, the actuating lever 21 is pivoted against the force of the spring 18 into one of the two positions 21a, 21b according to FIG. 11, the wedge surfaces 51 act on the wedge surfaces 50 in such a way that the two clamping rings 19a, 19b are spread in the manner described , The third wedge surfaces 50 are preferably realized analogously to the first wedge surfaces 27 as triangular projections on the arms 36, 37, while the fourth wedge surfaces 51 are preferably formed by cutouts in the end walls 23 analogously to the second wedge surfaces 33. The position and direction of action is to be selected taking into account the fact that the sleeve 22 is rotated by the actuating lever 21 about a pivot axis 52 (FIG. 12) which is perpendicular to the axis 2 (FIG. 1). In addition, the stroke of the actuating lever 21 or the sleeve 22 is in each case limited by the wall sections 41, 42 of the clamping rings 19a, 19b serving as stops, so that the size of the recess 47 in the sleeve 22 (FIG. 11) can easily be selected that it is covered by parts of the housing 1 in all pivoting positions of the actuating lever 21.

In a preferred embodiment of the invention, the actuating lever is 21 11 in its normal position substantially parallel to the axis 2 of the Passage 3 of the housing 1 arranged. To prevent unfavorable tilting moments when actuated to avoid in the area of the housing 1, the displacement along the Could hinder support rod 4, the housing 1 is preferably with a tubular, Extension 53 arranged parallel to the actuating lever 21 for the passage 3 Mistake. This extension runs coaxially to axis 2 and extends according to Fig. 11 and 12 expediently to the lower end of the actuating lever 21. This can a displacement of the entire device e.g. be brought about by using one hand encompasses both the actuating lever 21 and the extension 53 and the device after pressing the operating lever 21 into position 21a (Fig. 11) is shifted or rotated. This makes it particularly simple and smooth movement of the device possible. After the release of the operating lever 21 pivots under the action of the spring 18 back into his 11 in the middle position.

The invention is not limited to the exemplary embodiment described, which in can be modified in many ways. In particular, it is possible to use only one of the to use two clamping rings 19a, 19b and stops in the housing 1 or elsewhere to provide for the turning of the clamping ring when turning the remaining clamping ring 17 prevent. That could e.g. in that the one clamping ring firmly in Housing 1 is fixed and only the other clamping ring is turned. It would also be conceivable Provide clamping means that the clamping ring 17 against a fixed clamping ring or wedge surfaces fixed in the housing 1 rotates. Overall, there are numerous realize different clamping means for the clamping ring 17 without the advantage of simple assembly and ease of operation when operating the control unit 20 to give up. The arrangement can also always be made such that no disturbing opening gaps arise when the operating member 20 is actuated. Furthermore, the clamping ring 17 can consist of more or less than six pressure pieces 24 exist, its spring action existing in the radial direction preferably is set in that it is made from a plastic injection molded part and the shape and thickness of the elements 25 are chosen accordingly. The others too Parts of the device other than those made of spring wire or stainless steel Spring 18 are preferably made of plastic injection molded parts. Besides, it would the device described in principle suffice, the wedge surfaces 27, 33 only in one To let direction work. However, the training described has the advantage that Clamping ring 17 also in a position rotated by 180 ° into the clamping rings 19a, 19b can be inserted and these can be designed identically. As in Fig. 2 and 12 is indicated, can also between the receptacles 8 and the bearing plate 5 Locking or friction element 54 can be used to ensure smooth rotation of the To prevent the axle from being assembled.

Claims (23)

1. Device for mounting an object, especially a hand shower, in a displaceable manner on a support rod (4) with a housing (1) which has a passage (3) for the support rod (4) and two laterally protruding bearing discs (5,6) for the rotatable mounting of a bearing axle (7) provided with a receiver (8) for the object, and also has a clamping device which contains a clamp element, which is under the influence of a spring force and is intended to fix the housing (1) to the support rod (4) by means of a clamp connection, and an operating member (20) intended to release the clamp connection, characterised in that the clamp element is a clamp ring (17) which is arranged in the passage (3), is flexible in a radial direction and is intended to receive the support rod (4), said ring comprising a plurality of thrust-carrying pieces (24) and flexible elements (25) which connect the thrust pieces (24), the thrust pieces (24) being able to spring back outwards under the influence of the flexible elements (25), and the clamping device being provided with tensioning means for the clamp ring (17) which engage on the outside of the clamp ring (17).
2. Device according to claim 1, characterised in that the tensioning means contain at least one tension ring (19a, 19b) surrounding the clamp ring (17).
3. Device according to claim 2, characterised in that the tension ring (19a, 19b) is mounted so as to be rotatable relative to the clamp ring (17), and in that the clamp ring (17) and the tension ring (19a, 19b) are provided with wedge faces (27, 33) which cooperate in the circumferential direction.
4. Device according to claim 3, characterised in that complementary first and second wedge faces (27, 33) are formed on the outer perimeter of the clamp ring (17) and on the inner perimeter of the tension ring (19a, 19b).
5. Device according to claim 3 or 4, characterised in that the clamp ring (17) comprises a plurality of thrust pieces (24) which are provided with the first wedge faces (27) and are spaced apart in the circumferential direction, and which are connected to one another by the flexible elements (25).
6. Device according to claim 5, characterised in that the first wedge faces (27) are divided by radially protruding bearing webs (28) and each form an upper or respectively a lower row of first wedge faces (27).
7. Device according to claim 6, characterised in that two tension rings (19a, 19b) are provided which are rotatable relative to each other and which each have a row of second wedge faces (33), and in that one of the two rows of first wedge faces (27) is associated with each tension ring (19a, 19b).
8. Device according to one of claims 3 to 7, characterised in that the first and second wedge faces (27, 33) are each formed by two parts which are configured roof-like and inclined in opposite directions in the circumferential direction.
9. Device according to claim 7 or 8, characterised in that the clamping device has a spring (18) which pre-tensions the two tension rings (19a, 19b) into a position pressing the clamp ring (17) radially inwards.
10. Device according to claim 9, characterised in that the two tension rings (19a, 19b) are provided with radially protruding arms (36, 37) which are pre-tensioned by the spring into a spread position.
11. Device according to one of claims 7 to 10, characterised in that the two tension rings (19a, 19b) are provided with stops (41, 42) intended to limit their relative rotary movement.
12. Device according to claim 10 or 11, characterised in that the arms (36, 37) are disposed between the bearing discs (5, 6) and have openings (38, 39) through which the bearing axle (7) protrudes.
13. Device according to one of claims 2 to 12, characterised in that at least one tension ring (19a, 19b) and the operating member (20) are provided with cooperating third and fourth wedge faces (50, 51) which convert an actuation of the operating member (20) into a rotary movement of the tension ring (19a, 19b).
14. Device according to claim 13, characterised in that the third and fourth wedge faces (50, 51) are so configured that they move the two arms (36, 37) of the tension rings (19a, 19b) towards one another against the action of the spring (18).
15. Device according to claim 13 or 14, characterised in that the operating member (20) is pre-tensioned by the spring (18) into a position corresponding to a clamping position of the clamp ring (17).
16. Device according to one of claims 13 to 15, characterised in that the third and fourth wedge faces (50, 51) are so configured that they convert movements of the operating member (20) which occur in opposite directions into the same rotary movement of the tension ring or rings (19a, 19b).
17. Device according to one of claims 10 to 16, characterised in that that the operating member (20) has an actuating lever (21) and a sleeve (22) secured to one end thereof, said sleeve having two end walls (23) and a hollow body arranged between same to receive the arms (36, 37), the tension ring (19a, 19b) and the spring (18), the end walls (23) each being rotatably mounted between a bearing disc (5 or 6 respectively) and an arm (36 or 37 respectively) of the tension ring (19a or 19b respectively) and being provided with openings (23a) through which the bearing axle (7) protrudes.
18. Device according to one of claims 1 to 17, characterised in that the bearing axle (7) contains an axle portion (7b) configured as a hollow cylinder and an axle portion (7a) configured as a bolt which can be inserted axially into the hollow cylinder, the one axle portion (7a) being provided at one end with the receiver (8) and the other axle portion (7b) being provided at one end with a covering disc (9).
19. Device according to claim 18, characterised in that the two axle portions (7a, 7b) may be connected to each other by a bayonet catch (10, 11, 12).
20. Device according to claim 19, characterised in that the bayonet catch (10, 11, 12) is provided with at least one resilient tongue (14) which secures the connection.
21. Device according to one of claims 17 to 20, characterised in that the operating lever (21) is arranged substantially parallel to an axis (2) of the passage (3) for the support rod (4).
22. Device according to one of claims 17 to 21, characterised in that the housing (1) is provided with a tubular extension (53) for the passage (3), said extension being arranged parallel to the operating lever (21).
23. Device according to one of claims 1 to 22, characterised in that the various parts are so configured and arranged relative to one another that they can be connected to each other without additional fastening elements.

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