Positioning element for positioning a balustrade panel

Abstract

The invention relates to a positioning element (51) for positioning a balustrade panel (5) on a balustrade (3) of a passenger transport system (1) designed as an escalator or moving walkway. The positioning element (51) comprises a main part (52) which is designed such that it can be secured to an upper holding element (25) of the balustrade (3) by means of a latching connection (63), and a stop surface (60) formed on the main part (52) is designed to position an adjoining balustrade panel (5) on the balustrade (3) at a specified angle of inclination (α).

Description

[0001] Positioning element for positioning a balustrade panel

[0002] The invention relates to a positioning element for positioning a balustrade panel on a balustrade of a passenger transport system. A passenger transport system within the meaning of this description can, in particular, be a passenger transport system with a surrounding handrail and conveyor belt. The passenger transport system with a surrounding handrail and conveyor belt can, for example, be an escalator, in other words, a moving walkway. The conveyor belt can have several articulated step units, in the form of, for example, steps or pallets, which are movable in a longitudinal direction along the passenger transport system. On these step units, people and / or goods can be transported from one longitudinal end of the passenger transport system to the other longitudinal end. The passenger transport system can have a balustrade on one or both sides of the step units.The balustrade serves to prevent people or goods from leaving the passenger transport system during transport and / or from falling off or out of the passenger transport system.

[0003] It is known to clad and / or sheathe such a balustrade with one or more balustrade panels. The balustrade panels can, for example, serve to prevent people or goods from becoming entangled in the balustrade, such as in a supporting structure, during transport. The balustrade panels can be made of metal, such as sheet metal, wood, particularly stained wood, and / or glass, particularly safety glass. In principle, the balustrade panels can be easily mounted on the balustrade by inserting them, for example, between an upper cover and a spring element of the balustrade located behind it, then pivoting them and threading them onto a lower spring element of a lower retaining element of the balustrade.Such a balustrade with corresponding balustrade panels is known, for example, from US 3715761A.

[0004] One problem with this type of balustrade and its corresponding balustrade panels is that people or goods can touch the panels during transport, and if the forces acting on the panel become too high, the spring element can give way. This creates a gap between the top cover and the balustrade panel, so that, for example, fingers and / or clothing can become trapped in this gap once the force is released and the spring element pushes the panel back into its original position. This can be particularly critical in the case of an escalator used for passenger transport, as people could become stuck and fall.

[0005] The object of the present invention is to prevent the previously described gap formation and to eliminate the associated potential danger.

[0006] This task is solved by a positioning element for positioning a balustrade panel on the balustrade of a passenger transport system. Since the balustrade is part of a passenger transport system designed as an escalator or moving walkway, it has a surrounding handrail.

[0007] The positioning element comprises a main body designed to be attached to an upper support element of the balustrade by means of a snap-fit ​​connection. When the positioning element is properly installed, it is attached to the upper support element and positioned between the upper support element and the balustrade panel. A stop surface formed on the main body is designed to position an adjacent balustrade panel at a predetermined angle of inclination on the balustrade. Balustrades with opaque balustrade panels are typically not vertical but are arranged at an angle to the vertical, so that escalators and moving walkways equipped with such balustrades have a conveying channel with an isosceles trapezoidal cross-section, the horizontal base of which is formed by the conveyor belt and the sides by the balustrade panels.The positioning element also features a first locking element of the locking connection, which is located on the main body. This is designed to interact with a second locking element of the locking connection to attach the positioning element to the upper retaining element of the balustrade. The second locking element is located on the upper retaining element of the balustrade.

[0008] The major advantage of this positioning element lies in its ability to be used as needed and in a cost-effective manner. Depending on the balustrade panel used and its inherent rigidity, the required number of positioning elements can be snapped side-by-side into the upper retaining element along the length of the passenger transport system. This allows for more positioning elements to be arranged at closer intervals in critical sections where high forces are expected to act on the balustrade panel than in sections where lower forces are anticipated. For escalators, critical sections might include, for example, the access areas where users enter or exit the escalator.High forces acting on the balustrade panel can also occur in the transition areas where the conveyor belt changes from a horizontal conveying movement to an upward conveying movement, or vice versa.

[0009] In one embodiment of the positioning element, a vertical support surface can be formed on the main body, which is designed to support a horizontal force acting on the stop surface against a complementary surface of the upper retaining element of the balustrade. This relieves the locking connection of horizontally acting forces and secures it against unintentional release in the event of excessive force.

[0010] In one embodiment of the positioning element, a horizontal support surface is provided on the main body. This support surface is designed to transfer a moment acting on the main body to the upper retaining element of the balustrade. This moment is primarily caused by a horizontal and / or vertical force acting on the stop surface, since the locking connection acts like a lever bearing and the directions of action of the forces rarely pass through the center of the lever bearing.

[0011] In a further embodiment of the positioning element, the first locking element of the locking connection has a spring tongue. Its first end is fixed to the main body. The second end of the spring tongue is designed to be movable and has a locking lug that is complementary to the second locking element.

[0012] Furthermore, an operating handle can be provided at the second end to make it easier to release the locking connection by hand. Alternatively, the operating handle can be achieved by leaving a sufficiently long section of the second end free, allowing the locking connection to be released by hand with minimal effort.

[0013] Naturally, the locking connection can also be released using tools, such as a screwdriver. In a further embodiment of the positioning element, the first locking element can protrude from the top of the main body and be positioned on the main body. This allows, on the one hand, the second locking element to be integrated cost-effectively into a groove or other counterpart to the first locking element of the upper retaining element. On the other hand, the first locking element, due to its exposed position, can be easily inspected visually for damage or manufacturing defects.

[0014] In a further embodiment of the positioning element, a bore can be arranged in the main body. A fastening element, such as a screw connection, can be inserted or otherwise arranged in this bore so that the positioning element can be additionally and firmly connected or screwed to the holding element parallel to the snap connection.

[0015] As previously mentioned, the positioning element is installed in a balustrade for a passenger transport system. The balustrade has an upper support element and at least one of the positioning elements described above, which is attached to the upper support element by means of a snap-fit ​​connection. The balustrade also has a cover located on top of the upper support element. This cover has a section extending inwards from the upper support element and a section extending downwards from an inner end of the cover section facing away from the upper support element. In other words, the cover is L-shaped, at least in the area of ​​the positioning element.

[0016] The balustrade also features a lower support element located beneath the upper support element, which has a bearing for holding a balustrade panel. The at least one balustrade panel is positioned vertically between the cover and the bearing of the lower support element, and its upper edge, located at the upper support element, is positioned at a predetermined angle between the stop surface and the cover.

[0017] The balustrade retaining element can be made from an extruded profile, a rolled profile, or a bent sheet metal profile. According to a preferred embodiment, the retaining element has a groove extending longitudinally along its length and open downwards in the intended installed state. The second locking element is formed within the groove.

[0018] Additionally, the retaining element of the balustrade may have a T-shaped cross-section receiving channel, open downwards in the intended installation state, which extends parallel to the groove in the retaining element.

[0019] If the expected forces acting on the positioning element are so high that the locking connection could fail, a screw connection with a rhombic screw head can be installed in the bore of the main body. In the assembled state, the first locking element is engaged with the second locking element, and the rhombic screw head is positioned in the T-shaped receiving channel. A nut on the screw connection is tightened to clamp the positioning element against the retaining element.

[0020] One aspect of the invention relates to a passenger transport system, in particular an escalator or moving walkway with a supporting structure and a conveyor belt arranged circumferentially within the supporting structure. Balustrades of the aforementioned type are arranged on both longitudinal sides of the supporting structure and are rigidly connected to it.

[0021] A further aspect of the invention relates to a method for mounting the positioning element described above on an upper retaining element of the balustrade described above. The positioning element is held below the retaining element, and its first locking element is aligned with the groove of the retaining element. Subsequently, by pressing the first locking element into the groove, the positioning element is engaged in the retaining element with the second locking element. The stop surface of the engaged positioning element is oriented towards the retaining section of the cover.

[0022] This method can be supplemented by inserting a screw connection with a rhombic head into the bore of the main body and fitting it with a nut before mounting the positioning element to the holding element. The rhombic screw head, with its narrow wrench size, is aligned with the longitudinal extent of the T-shaped receiving channel. When the first locking element is pressed into the groove, the screw head is also inserted into the receiving channel. Tightening the nut pivots the screw head around the central longitudinal axis of the screw connection until its flanks abut the inner surfaces of the receiving channel.

[0023] It should be noted that some of the possible features and advantages of the invention are described herein with reference to only one of the aspects. However, a person skilled in the art will recognize that these features can readily be transferred to one or more of the other aspects in order to arrive at further embodiments within the scope of protection of the attached claims of the invention and / or to achieve further advantages.

[0024] Embodiments of the invention are described below with reference to the accompanying drawings, whereby neither the drawings nor the description are to be interpreted as limiting the invention.

[0025] Figure 1 shows an embodiment of a passenger transport system with balustrades.

[0026] Figure 2 shows a sectional view of the passenger transport system according to Figure 1.

[0027] Figure 3 shows the enlarged section X through the upper part of the balustrade, as shown in Figure 2, with a positioning element located there.

[0028] Figure 4 shows a side sectional view of the positioning element according to Figure 3.

[0029] Figure 5 shows a perspective view of the positioning element according to Figure 3.

[0030] Figure 6 shows a side view of the positioning element according to Figure 3.

[0031] Figure 7 shows a perspective view of a variant design of the positioning element.

[0032] The figures are schematic only and not to scale. Identical reference symbols in the different figures denote identical or equivalent features. Figure 1 shows a passenger transport system 1; Figure 2 shows a sectional view of the passenger transport system 1 according to Figure 1. The two figures are described together below.

[0033] The passenger transport system 1 can, for example, be an escalator, in other words a moving walkway, and has a supporting structure 7 in which a conveyor belt 16 is arranged circumferentially. On each of the two longitudinal sides of the supporting structure 7, or in its longitudinal direction 9, a balustrade 3 with a circumferential handrail 27 is arranged and rigidly connected to the supporting structure 7.

[0034] The balustrade 3 is clad, at least on its inner side, with balustrade panels 5. The balustrade panels 5 can be made of, for example, metal (e.g., sheet metal), wood (especially stained wood), and / or glass (especially safety glass). The balustrade 3 serves to prevent persons and / or goods from leaving the passenger transport system 1 while it is in motion and / or from falling off or out of the passenger transport system 1.

[0035] In the embodiment shown in Figures 1 and 2, the passenger transport system 1 is designed as an escalator. In this case, the passenger transport system 1 runs from a first floor El to a second floor E2, with the first floor El being lower than the second floor E2. If the passenger transport system 1 is designed as a moving walkway, it can extend over a constant height level.

[0036] In Figure 1, the passenger transport system 1 is arranged as intended. An area above the passenger transport system 1 is labelled "O" and an area below the passenger transport system 1 is labelled "U". The longitudinal direction 9 of the passenger transport system 1 follows the horizontal and inclined sections of the passenger transport system 1. In the case of a moving walkway as the passenger transport system 1, the longitudinal direction 9 can be parallel to the horizontal direction 11.

[0037] As shown in the sectional view of Figure 2, the passenger transport system 1 can be designed with mirror symmetry. The area above the passenger transport system is also labelled "O", the area below the passenger transport system 1 is labelled "U", an area outside the passenger transport system 1, in particular outside the balustrade 3, is labelled "A", and an area inside the balustrade 3 is labelled "I". A lateral direction 13, as defined in this description, is parallel to the horizontal direction 11 and perpendicular to the longitudinal direction 9.

[0038] The passenger transport system 1 has a balustrade 3 on each side. Each balustrade 3 has an upper retaining element 25, at least one positioning element 51, a cover 23, a lower retaining element 19, and at least one balustrade panel 5. The positioning element 51 is attached to the upper retaining element 25. When the positioning element 51 is in its intended position, its lateral direction 13 is oriented from the inside (I) to the outside (A). The cover 23 is positioned above (O) the upper retaining element 25. The lower retaining element 19 is positioned below (U) the upper retaining element 25. The balustrade panels 5 can be mechanically coupled to the lower retaining element 19 at their undersides (U) in a conventional manner known from the prior art. Such a known coupling is described, for example, in Figure 4 and the corresponding description in CN 15621588 U.The lower retaining element 19 has a support 17 for holding the balustrade panel 5. In the present embodiment, the support 17 is designed as a tongue and groove joint (see also Figure 3).

[0039] Each balustrade panel 5 can be positioned on the corresponding balustrade 3 by means of one, two, or more positioning elements 51. The balustrade panels 5 can each have an angle profile 21 extending essentially vertically. The angle profile 21 can contribute to the stability of the corresponding balustrade panel 5. Alternatively or additionally, the angle profile 21 can contribute to the secure and reliable positioning of the corresponding balustrade panel 5 on the support 17.

[0040] The balustrades 3 can each have a supporting structure (not shown) arranged on the support structure 7 of the passenger transport system 1. The supporting structure and / or the support structure 7 can each have a truss structure (not shown). The upper retaining element 25 and / or the lower retaining element 19 can be arranged on the supporting structure of the balustrade 3 or form part of the supporting structure of the balustrade 3.

[0041] The passenger transport system 1 has a conveyor belt 16 with several articulated step units 15 for transporting persons or goods. The step units 15 can be arranged next to the balustrade 3. The step units 15 are arranged inside, in particular between the two balustrades 3. The step units 15 are arranged to be movable along the balustrade 3 in the longitudinal direction 9. In particular, the step units 15 can be arranged circumferentially, so that the upper step units 15 always move in the opposite direction to the step units 15 arranged below them.

[0042] The step units 15 can be connected to each other by means of one or more belts and / or by means of one or more chains (not shown), by means of which the step units 15 can be moved. Alternatively, the passenger transport system 1 can have a pallet belt (not shown) for transporting persons and / or goods. The step units 15 can be designed as steps in the case of an escalator and as flat pallets in the case of a moving walkway. The step units 15 can be moved, for example, by means of an electric motor (not shown) of the passenger transport system 1. The belts or chains can be moved along the longitudinal direction 9 to move the step units 15.

[0043] When arranged as intended on the corresponding balustrade 3, the balustrade panels 5 are approximately vertical, with a predetermined angle of inclination α. ​​The outer surfaces 22 of the balustrade panels 5 face inwards I towards the step units 15. The inner surfaces 20 of the balustrade panels 5 face outwards A, i.e., away from the step units 15 and, if applicable, towards the supporting structure 31 (see Figure 3) of the corresponding balustrade 3.

[0044] The upper retaining elements 25 of the balustrades 3 can each be or have a guide rail 29 for the handrail 27 of the corresponding balustrade 3. The guide rail 29 can extend in the longitudinal direction 9 over the entire length of the passenger transport system 1, in particular the balustrade 3.

[0045] The continuous handrail 27 is loop-shaped and runs along the guide rail 29 on one side and is guided back within the balustrade 3 by support rollers (not shown) on the other. The handrail 27 is driven by an electric motor (not shown). During operation of the passenger transport system 1, the continuous handrail 27 must maintain a speed synchronous with the step units 15. Figure 3 shows the enlarged sectional view X through the upper area O of the balustrade 3, as shown in Figure 2, with a positioning element 51 located there. As already described, the balustrade 3 has a retaining element 25, a cover 23, and a guide rail 29, which are arranged one above the other in this order and are firmly connected to each other by means of screw connections 33. The positioning element 51 is detachably connected to the retaining element 25 by a snap-fit ​​connection 63.The retaining element 25 is made from an extruded profile and has a groove 65 extending in the longitudinal direction 9 of the passenger transport system 1, or of the retaining element 25. In the illustrated installed state, the groove 65 is open to the bottom U. A second locking element 67 of the locking connection 63 is formed in the groove 65.

[0046] The balustrade panel 5 is shown in its assembled state, positioned at a predetermined angle of inclination α to the vertical on the balustrade 3. The balustrade panel 5 is held in a form-fitting manner by the lower support 17, designed as a tongue-and-groove connection, against downwards U, inwards I and outwards A, or supported in the retaining element 19 on the supporting structure 31.

[0047] Figure 4 shows a side sectional view of the positioning element 51 according to Figure 3; Figure 5 shows a perspective view of the positioning element 51 according to Figure 3; Figure 6 shows a side view of the positioning element 51 according to Figure 3; and Figure 7 shows a perspective view of the positioning element 51 according to Figure 3, supplemented with an optional screw connection 81. Figures 3 to 7 are described together below.

[0048] The positioning element 51 comprises a main body 52, which can be attached to the upper retaining element 25 of the balustrade 3 by means of the snap-fit ​​connection 63. The snap-fit ​​connection 63 has a first locking element 54 which projects from a top surface 53 of the main body 52. ​​The first locking element 54 is designed to interact with the second locking element 67 of the snap-fit ​​connection 63. For this purpose, the first locking element 54 has a spring tongue 55, the first end 57 of which is fixedly connected to the main body 52, the second end 56 of which is freely movable, and the second end 56 of which has a locking lug 58 that is complementary to the second locking element 67. In the intended arrangement, the positioning element 51 is attached to the upper retaining element 25 and is positioned between the upper retaining element 25 and the balustrade panel 5.A stop surface 60 formed on the main body 52 is designed to position the adjacent balustrade panel 5 at a predetermined angle of inclination α on the balustrade 3. As shown in Figure 3, the cover 23, which is arranged on the upper retaining element 25, has a cover section 26 that extends inwards I from the upper retaining element 25. The balustrade panel 5, mounted on the balustrade 3, rests against the stop surface 60 with its inner side 20. Furthermore, the cover 23 has a retaining section 28 that extends downwards from an inner end 30 of the cover section 26 facing away from the upper retaining element 25. In other words, the cover 23 is L-shaped, at least in the area of ​​the positioning element 51.The mounted balustrade panel 5 projects behind the retaining section 28, so that its upper edge section 18 is caught between the positioning element 51 and the retaining section 28. To prevent the balustrade panel 5 from being lifted too easily out of the lower retaining element 19, a spring element 35 is attached or clamped between the cover 23 and the upper retaining element 25. The spring element 35 presses the balustrade panel 5 against the support 17 with appropriate preload.

[0049] The positioning element 51 also has a vertical support surface 59, which is designed to support a horizontal force F acting on the stop surface 60 against a complementary surface 36 of the upper retaining element 25. Furthermore, a horizontal support surface 64 is provided on the main body 52, which is designed to support a moment M acting on the main body 52 against the upper retaining element 25. The moment M is caused, for example, by a horizontal and / or vertical force F acting on the stop surface 60.

[0050] To enable the positioning element 51 to be easily detached from the retaining element 25, an actuating handle 66 is provided at the second end 56. When the actuating handle 66 is pressed, the first locking element 54 is pushed away from the second locking element 67, thereby releasing the locking connection 63.

[0051] If large forces are expected to act on the positioning element 51, an additional bore 68 for a screw connection 81 can be provided in the main body 52. ​​Large forces F can occur, for example, in escalators and moving walkways that are subject to vandalism or where altercations between users may occur. The screw connection 81 can be a screw with a rhomboid-shaped screw head 82, as shown in Figures 3 and 7. To accommodate the rhomboid-shaped screw head 82, a T-shaped receiving channel 83, open downwards in the intended installed state, is formed in the retaining element 25 and extends parallel to the groove 65 in the retaining element 25.Before the positioning element 51 is mounted on the holding element 25, a screw connection 81 with a rhombic screw head 82 is positioned in the bore 68 of the main body 52 and fitted with a nut 84. The rhombic screw head 82, with its narrow wrench size S, is aligned with the longitudinal extent L of the T-shaped receiving channel 83. When the first locking element 54 is pressed into the groove 65, the screw head 82 is inserted into the receiving channel 83. Subsequently, when the nut 84 is tightened, the screw head 82 is pivoted about the central longitudinal axis of the screw connection 81 until its flanks 85, 86 abut the inner surfaces 87, 88 of the receiving channel 83.

[0052] Although Figure 1 shows a passenger transport system 1 designed as an escalator, it is obvious that the inventions described above can also be used in a moving walkway. Figures 3 to 7 show a locking connection 63 in which the first locking element 54 projects from a top surface 53 of the main body 52 and is arranged on the main body 52. ​​However, it is obvious that the first locking element 54 can also be arranged in a recess of the main body 52 and that the second locking element 67 can project from the upper retaining element 25.

Claims

1. Positioning element (51) for positioning a balustrade panel (5) on a balustrade (3) of a passenger transport system (1) designed as an escalator or moving walkway, wherein the balustrade (3) has a circumferential handrail (27), characterized in that the positioning element (51) comprises: a main body (52) designed in such a way that it can be attached to an upper retaining element (25) of the balustrade (3) by means of a snap connection (63), wherein, in an intended arrangement of the positioning element (51), the positioning element (51) is attached to the upper retaining element (25) and is arranged between the upper retaining element (25) and the balustrade panel (5); a stop surface (60) formed on the main body (52) which is designed to position an adjacent balustrade panel (5) with a predetermined angle of inclination (a) on the balustrade (3);and a first locking element (54) of the locking connection (63), which is arranged on the main body (52) and is designed to cooperate with a second locking element (67) of the locking connection (63) to attach the positioning element (51) to the upper retaining element (25) of the balustrade (3), wherein the second locking element (67) is arranged on the upper retaining element (25) of the balustrade (3).

2. Positioning element (51) according to claim 1, wherein a vertical support surface (59) is formed on the main body (52), which is provided to support a horizontal force (F) acting on the stop surface (60) on a complementary surface (36) of the upper retaining element (25) of the balustrade (3).

3. Positioning element (51) according to claim 1 or 2, wherein a horizontal support surface (64) is provided on the main body (52) which is designed to support a moment (M) acting on the main body (52) on the upper retaining element (25) of the balustrade (3), wherein the moment (M) is caused by a horizontal and / or vertical force (F) acting on the stop surface (60).

4. Positioning element (51) according to one of claims 1 to 3, wherein the first locking means (54) of the locking connection (63) has a spring tongue (55) the first of which end (57) is firmly connected to the main body (52) and its second end (56) is designed to be movable and that the spring tongue (55) has a locking lug (58) designed to be complementary to the second locking means (67).

5. Positioning element (51) according to claim 4, wherein an actuating handle (66) is provided at the second end (56).

6. Positioning element (51) according to one of claims 1 to 5, wherein the first locking means (54) is arranged on the main body (52) projecting from a top surface (53) of the main body (52).

7. Positioning element (51) according to one of claims 1 to 6, wherein a bore (68) for a screw connection (81) is arranged in the main body (52).

8. Balustrade (3) for a passenger transport system (1); the balustrade (3) comprising: an upper retaining element (25); a positioning element (51) according to one of the preceding claims, which is attached to the upper retaining element (25) by means of the snap connection (63); a cover (23) which is arranged on the upper retaining element (25) and which has a cover section (94) extending inwards from the upper retaining element (25) and a retaining section (96) extending downwards (U) from an inner end (30) of the cover section (94) facing away from the upper retaining element (25); a lower retaining element (19) which is arranged below the upper retaining element (25) and which has a support (17) for holding a balustrade panel (5);and the at least one balustrade panel (5) which is arranged in a vertical direction between the cover 23 and the support (17) of the lower retaining element (19) and whose upper edge area (18) present at the upper retaining element (25) is arranged between the stop surface (60) and the cover (23) at a predetermined angle of inclination (a).

9. Balustrade (3) according to claim 8, wherein the retaining element (25) is made from an extruded profile, a rolled profile or a sheet bent profile, and the retaining element (25) has a groove (65) which extends in the longitudinal direction (9) of the retaining element (25) and is open downwards in the intended installation state, wherein the second locking means (67) is formed in the groove (65).

10. Balustrade (3) according to claim 9, wherein a receiving channel (83) in the retaining element (25) is formed in a T-shaped cross-section and is open downwards in the intended installation state, extending parallel to the groove (65) in the retaining element (25).

11. Balustrade (3) according to claim 10, wherein a screw connection (81) with a rhombic screw head (82) is arranged in the bore (68) of the main body (52) according to claim 7, wherein in the assembled state the first locking means (54) is engaged in the second locking means (67), the rhombic screw head (82) is arranged in the T-shaped receiving channel (83) and a screw nut (84) arranged on the screw connection (81) is tightened.

12. Passenger transport system (1) with a supporting structure (7), with a conveyor belt (16) arranged circumferentially in the supporting structure (7) and with balustrades (3) arranged on the two longitudinal sides of the supporting structure (7) and firmly connected to the supporting structure (7) according to one of claims 8 to 11.

13. Method for mounting a positioning element (51) according to one of claims 1 to 7 on an upper retaining element (25) of a balustrade (3) according to one of claims 8 to 11, characterized in that the positioning element (51) is held below the retaining element (25), and its first locking means (54) is aligned to the groove (65) of the retaining element (25), and subsequently, by pressing the first locking means (54) into the groove (65), the positioning element (51) is locked into the retaining element (25) with the second locking means (67), wherein the stop surface (60) of the locked positioning element (51) is directed against the retaining section (96).

14. Method according to claim 13, wherein, prior to the assembly of the positioning element (51), a screw connection (81) with a rhombic screw head (82) is arranged in the bore (68) of the main body (52) on the holding element (25) and is provided with a screw nut (84); the rhombic screw head (82) with its narrow wrench width (S) is aligned with the longitudinal extension (9) of the T-shaped receiving channel (83) according to claim 8 or 9; when the first locking means (54) is pressed into the groove (65), the screw head (82) is inserted into the receiving channel (83); and when the screw nut (84) is tightened, the screw head (82) is pivoted about the central longitudinal axis of the screw connection (81) until its flanks (85, 86) abut inner surfaces (87, 88) of the receiving channel (83).

Images