CN115210441A

CN115210441A - Device for assisting the closing and opening of a lifting slide element and lifting slide element equipped with such a device

Info

Publication number: CN115210441A
Application number: CN202180018066.1A
Authority: CN
Inventors: M·纳佩克
Original assignee: Maco Technologie GmbH
Current assignee: Maco Technologie GmbH
Priority date: 2020-04-01
Filing date: 2021-03-29
Publication date: 2022-10-18
Also published as: EP4097322A1; DE102020109074A1; WO2021198185A1

Abstract

The invention relates to a device for assisting the closing and opening of a lifting slide element. The device comprises: a base for mounting on a fan frame of the elevated sliding element; an axially extending first pre-tensioning element having a first end and a second end hinged on the base body; an axially extending second pre-tensioning element having a first end and a second end hinged on the base body; a switching mechanism having a first defined-end switching position and a second defined-end switching position, the first end of the first pre-tensioning element being coupled to the first end of the second pre-tensioning element by the mechanism. The switching mechanism has an unstable equilibrium position between its two end switching positions, the two pretensioning elements being aligned with one another only in the unstable equilibrium position.

Description

Device for assisting the closing and opening of a lifting slide element and lifting slide element equipped with such a device

Technical Field

The invention relates to a device for assisting the closing and opening of a lifting slide element. According to the invention, the device assists in particular in closing the lifting slide element, so that the lifting slide element or its sliding sash (schiebefflug) can be moved into its closed position as gently as possible. Also, the device assists the opening of the lifting slide element so that it can be moved from the closed position to its open position with as little force as possible.

Background

Conventional lifting slide elements, such as lifting slide doors, may weigh as much as 400kg or more. The result may be that a correspondingly large force is required to move the sliding leaf of such a lifting sliding door, for example when opening the lifting sliding door from its closed position. Once this lifting sliding door leaf has started to move, it has a considerable kinetic energy due to its weight, which, when closing, may cause the sliding leaf to collide with the cheek (blendlahmen) when reaching the closed position, which may cause the lifting sliding door to be damaged, especially at high impact speeds. The same problem occurs when such a raised sliding door is fully open, since the sliding sash will strike the jamb when it reaches the open position.

Disclosure of Invention

The object of the invention is therefore to provide a device with which the lifting slide can be opened with only a small force and can also be closed gently.

This object is achieved by a device for assisting the closing and opening of a lifting slide element, such as a lifting slide door or a lifting slide window, having the features of claim 1.

The device for assisting the closing and opening of a lifting slide element according to the invention comprises: a base body designed for attachment to a fan frame of the lifting slide element. Two axially extending pretensioning elements are hinged on the base body, so that they do not have to be mounted separately on the fan frame of the lifting slide element. In particular, the device has a first axially extending pretensioning element, for example a first pneumatic spring, which has a first end and a second end, which are hinged to the base body. The device further comprises a second axially extending pretensioning element, for example a second gas spring, having a first end hinged to the base body and a second end. Since the two pretensioning elements are articulated on and carried by the base body, the device can be operated and mounted on the lifting slide element or its slide, in its entirety, so that the two pretensioning elements do not have to be operated and mounted on the lifting slide element separately.

Furthermore, the device has a switching mechanism that is switchable between a first end switching position and a second end switching position. If the switching mechanism is, for example, transferred from its first end switching position to its second end switching position, the switching mechanism cannot be moved beyond the second end switching position. The same applies to a switching process of the switching mechanism from its second end switching position to its first end switching position, in which the switching mechanism cannot be moved beyond its first end switching position.

The switching mechanism serves as a coupling joint between the two pretensioning elements, since the first end of the first pretensioning element is coupled to the first end of the second pretensioning element by the switching mechanism in the case of pretensioning of the first and/or second pretensioning element. Irrespective of the position or the deflection of the two pretensioning elements, they always interact with one another, since one pretensioning element applies a pretensioning force to the other pretensioning element via the switching mechanism and vice versa.

The switching mechanism is designed such that it has only one unstable equilibrium position between its two end switching positions. The two pretensioning elements are therefore only aligned with one another in the unstable equilibrium position in question and are therefore axially aligned with one another. On the other hand, apart from or outside the unstable equilibrium position of the switching mechanism, the two pretensioning elements are not axially aligned with each other, as a result of which only force components of the pretensioning elements that act in the axial extension direction of the other pretensioning element interact. For example, if the second pre-tensioning element is deflected relative to the first pre-tensioning element, only a force component aligned with the first pre-tensioning element is transmitted from the second pre-tensioning element to the first pre-tensioning element.

If, in a position of the device, for example, the second pretensioning element is deflected relative to the first pretensioning element, the first pretensioning element is compressed more than the second pretensioning element, the pretensioning force exerted by the first pretensioning element in this position is always greater than the force component of the second pretensioning element acting in the direction of the first pretensioning element. This can be used to the effect that, in the state of the device mounted on a lifting slide element, when the first end of the first pretensioning element is supported on a fixed or stationary abutment, the first pretensioning element in the first end switching position of the switching mechanism pushes the lifting slide element in the direction of its closed position against the pretensioning force of the second pretensioning element.

Conversely, when the first end of the second pretensioning element is supported on a fixed or stationary abutment, the second pretensioning element in the second end switching position of the switching mechanism can push the lifting slide element against the pretensioning force of the first pretensioning element in the direction of the open position of the lifting slide element.

Likewise, the device may also be used to ensure that the lifting slide element gently occupies its open position without striking the cheek. In this case, the second pretensioning element in the second end-switching position of the switching mechanism pushes the lifting slide element in the direction of its open position against the pretensioning force of the first pretensioning element when the first end of the second pretensioning element is supported on a fixed or stationary abutment. Conversely, when the first end of the first pretensioning element is supported on a fixed or stationary abutment, the first pretensioning element in the first end switching position of the switching mechanism can push the lifting slide element in the direction of its closed position against the pretensioning force of the second pretensioning element.

As mentioned above, the function of the switching mechanism is primarily to deflect one pretensioning element relative to the other. For example, if the second pretensioning element is deflected relative to the first pretensioning element during the closing of the lifting slide element, the first pretensioning element pushes the slide leaf of the lifting slide element into its closed position, preferably until the pretensioning force exerted by the first pretensioning element is balanced by a force component of the second pretensioning element, which force component is aligned with the first pretensioning element. In this way, the lifting sliding element can be closed gently by the first pretensioning element without the risk of the sliding sash of the lifting sliding element colliding with the cheek.

If the switching mechanism cannot be switched, the device according to the invention will not be able to assist in lifting the subsequent opening of the sliding element, since in this case the sliding fan will always be pushed by the first pretensioning element in the direction of its closed position.

Thus, if the switching mechanism is transferred in a manner according to the invention into its second end switching position in the closed position of the lifting slide element, the first pretensioning element is deflected relative to the second pretensioning element, with the result that the force component exerted by the first pretensioning element acting in the direction of the second pretensioning element is smaller than the pretensioning force of the second pretensioning element. The second pretensioning element can therefore now open the sliding leaf of the lifting slide element against the pretensioning effect of the first pretensioning element or push the sliding leaf in the direction of its open position.

The lifting slide element can therefore be closed gently and opened without difficulty by using the device according to the invention, since the switching mechanism is integrated in the device according to the invention.

Depending on the direction of movement of the lifting slide element, the stationary abutment on which the first or the second pretensioning element is supported does not collide with the first pretensioning element when the lifting slide element is open, which can be provided according to an embodiment in that the abutment is designed axially flexibly perpendicular to the axial extension of the two pretensioning elements. If the abutment is in contact with the first pretensioning element during the opening of the lifting slide element, the abutment can be pushed back, for example, by means of the first pretensioning element.

According to one embodiment, the switching mechanism may have, for example, an angled L-shaped switching element, which is also referred to herein as a corner element, and which is pivotable between two end switching positions. In this embodiment, the switching element or corner element has a first leg and a second leg, which are preferably aligned substantially perpendicularly to each other. The first end of the first pretensioning element is hinged to the free end of the first leg, while the first end of the second pretensioning element is hinged to the free end of the second leg. Thus, if the switching mechanism and in particular its switching element is, for example, in the first end switching position, the first pretensioning element can be indirectly supported on the abutment via the first leg of the switching element. On the other hand, if the switching mechanism and in particular the switching element is in the second end switching position, the second pretensioning element can be indirectly supported on the abutment by the second leg of the switching element.

In order to ensure that the respective pretensioning element has a defined deflection relative to the other pretensioning element, it can be provided according to a further embodiment that the first leg forms a first stop, which the first pretensioning element contacts in the first end switch position. Likewise, the second leg may form a second stop, which the second pretensioning element contacts in the second end switching position. The stop can thus ensure that the switching element cannot be pivoted beyond its respective end switching position, so that the respectively deflected pretensioning element has a defined deflection relative to the respective other pretensioning element.

Since the two pretensioning elements are articulated at their respective second ends on the base body and are in a pretensioned condition with respect to one another, it can be provided according to a further embodiment that the switching mechanism is mounted movably on the base body and is fixed to the base body against a lifting force. This may prevent the two pretensioning elements from deflecting or buckling relative to each other at the same time. For this purpose, in particular, a rotary joint which can be displaced along the base body can be provided, the intersection of the two legs of the switching element lying on the axis of rotation of the rotary joint.

According to a further embodiment, the two pretensioning elements can be designed to be of the same construction and in particular have the same spring rigidity. The same structural component can be used for the function of the two pretensioning elements, in particular due to the switching mechanism, since this ensures that, depending on the switching position of the switching mechanism, the spring force of one pretensioning element can overcome the force component of the other pretensioning element acting in the same pretensioning element direction.

As mentioned above, the switching mechanism is in its first end switching position during the opening of the lifting slide element, while the switching mechanism has to be transferred to its second end switching position in order to open the lifting slide element. The switching of the switching mechanism to its second end switching position may be effected by applying an opening pulse to a fan which lifts the sliding element

Is effected, whereby the switching mechanism switches into its second end switching position, since the switching mechanism is supported on the bearing in the closed position of the lifting slide element.

However, additionally or alternatively, the device according to the invention may also comprise an actuating mechanism with which the switching mechanism interacts in the closed position of the lifting slide element, such that the switching mechanism pivots from its first end switching position to its second position when the lifting slide element is lowered. For example, the shift element can be positively coupled (zwangsgekoppelt) to a gear of the lifting slide element, by means of which the shift element can be raised and lowered, so that the shift element automatically shifts into its second end shift position when the lifting slide element or its slide is lowered. If the fan lifting the sliding element is raised again into its closed position after being lowered, the switching element is already in its second end position, with the result that the first pretensioning element is deflected relative to the second pretensioning element and the second pretensioning element can thus push the fan into its open position.

Drawings

The invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

FIG. 1 shows a view of a lifting sliding door without a fixed leaf according to the present invention;

FIG. 2 illustrates a detail "A" of FIG. 1 on an enlarged scale;

figure 3 shows a view of the device according to the invention;

figure 4 shows three views of the device according to the invention in different states during the closing of the lifting slide;

fig. 5 shows three views of the device according to the invention in different states during the opening of the lifting slide; and

fig. 6 shows two views of two further states of the device according to the invention during a further opening of the lifting slide.

Detailed Description

The basic structure of the device 50 according to the invention and its positioning on the lifting sliding door 10 will be described first with reference to fig. 1, 2 and 3, and subsequently the mode of operation of the device 10 according to the invention will be described with reference to fig. 4 to 6.

Fig. 1 shows a lifting sliding element, more precisely a lifting sliding door 10 with a surrounding cheek 12, which accommodates a sliding sash 14, which is guided in the cheek 12 for displacement along an upper leg 18 and a lower leg 20 of the cheek 12. The sliding sash 14 in turn comprises a sash frame 16 that accommodates the glass of the sliding sash 14.

As can be seen in particular from fig. 2, in the upper leg 22 of the fan frame 16 there is an elongate, upwardly open recess 24 for accommodating a base body 52 of the device 50 according to the invention, comprising

pretensioning elements

54, 56 and a switching mechanism 58. However, a downwardly opening recess 26 is formed in the upper leg 18 of the cheek 12, and the seat 60 of the device 50 according to the present invention is disposed and mounted in the recess 26. As an alternative to the arrangement shown here, however, the base body 52 of the device 50 according to the invention, including the

pretensioning elements

54, 56 and the switching mechanism 58, can also be arranged in the downwardly open recess 26 of the fan frame 16, and the abutment 60 can be arranged in the upwardly open recess 24 of the fan frame 16 without impairing the function of the device.

The structure of the device 50 according to the invention will be explained in more detail below with reference to fig. 3. As can be seen from the illustration in fig. 3, the device 50 according to the invention has, as already mentioned, a base body 52 which serves to a certain extent as a housing or support for the device 50 according to the invention, since the base body 52 accommodates the other components of the device 50. In particular, the device 50 comprises a first axially extending pretensioning element 54, in this case a first gas spring 54, and a second axially extending pretensioning element 56, in this case a second gas spring 56. The two gas springs 54, 56 are of conventional construction, each having a plunger guided in a cylinder. The first gas spring 54 has a first end 62 and a second end 64, wherein the second end 64 is connected to the base body 52 in an articulated manner. Likewise, the second gas spring 56 has a first end 66 and a second end 68, the second end 68 being hingedly connected to the base 52, see in particular fig. 4. Conversely, the first end 62 of the first gas spring 54 is coupled to the first end 66 of the second gas spring 56 by the switching mechanism 58, which is described in greater detail below.

In the state of the device 50 as shown in fig. 3, the first gas spring 54 is almost completely tensioned or compressed, while the second gas spring 56 is almost completely extended, which means that the two gas springs 54, 56 are coupled to one another under pretension via a switching mechanism 58.

The switching mechanism 58 is a substantially angled L-shaped member 70 having a first leg 72 and a second leg 74 extending substantially perpendicular thereto. The first end 62 of the first gas spring 54 is hinged to the free end of the first leg 72, while the first end 66 of the second gas spring 56 is hinged to the free end of the second leg 74.

As indicated by the static symbol of the floating bearing, the angle element 70 is movably mounted on the base body 52 by means of the rotary joint 26 displaceable along the base body 52 and is thus fixed thereon to counteract the lifting force. The axis of rotation of the swivel joint 76 coincides with the intersection of the two legs 72, 74 of the corner element 70, so that the corner element 70 can be switched about the axis of rotation of the swivel joint 76 between a first end switching position according to the third view of fig. 4 and a second end switching position according to the third view of fig. 3.

The mode of operation of the device 50 according to the invention will be discussed below with reference to fig. 3 to 6, wherein further features of the device 50 are also discussed herein.

If the sliding sash 14 lifting the sliding door 10 is closed by means of the device 50 mounted on the sliding sash 14, as indicated by the arrow pointing to the right in the first view of fig. 4, the corner element 70 of the switching mechanism 58 and in particular the second leg 74 of the corner element 70 come into contact with the abutment 60 attached to the frame 70 according to the first view of fig. 4. If the closing movement is now continued, the angle element 70 is caused to deflect counterclockwise about the rotary joint 76 from the second end switching position according to the first view in fig. 4 into the first end switching position according to the third view in fig. 4.

In the first end switching position according to the third view in fig. 4, the first gas pressure spring 54 is now supported on the abutment 60, as the first gas pressure spring 54 is almost completely compressed, causing the first gas pressure spring 54 to push the sliding leaf 14 further to the right into its closed position until the position shown in the first view in fig. 5 is reached, in which the first gas pressure spring 54 is almost completely extended and the second gas pressure spring 56 is almost completely compressed.

Since the second gas spring 56 is deflected with respect to the longitudinal axis of the first gas spring 54 into the first end switching position of the corner element 70 according to the third view of fig. 4, the pretensioning force of the first gas spring 54 is only counteracted by the horizontal component of the pretensioning force of the second gas spring 56, so that the second gas spring 56 can be almost completely compressed, as shown in the first view in fig. 5, despite the reduced pretensioning force when the first gas spring 54 is extended. In the first view of fig. 5, the pretension of the first gas spring 54 is balanced with the horizontal component of the second gas spring 56, which has the effect that the sliding sash 14 can be closed softly without hitting the cheek 12.

If the sliding fan 14 is now to be turned on again, an opening pulse can be applied manually to the sliding fan 14, as indicated by the arrow pointing to the left in the first view of fig. 5. As a result of which the corner element 70 is pivoted clockwise about the swivel joint 76 until the second leg 74 of the corner element 70 comes into contact with the abutment 60, as according to the third view in fig. 5. Since the first gas spring 54 is deflected in this position relative to the second gas spring 56, the pretensioning force of the compressed second gas spring 56 overcomes only the component of the pretensioning force of the first gas spring 54 which is aligned with the second gas spring 56. The second gas spring 56 can thus be extended in accordance with the transition from the third view of fig. 5 to the first view of fig. 6 and is supported here on the support 60, resulting in the sliding sash 14 opening automatically after the opening pulse has been applied.

As above, the device 50 according to the present invention may be used to prevent the flap 14 from colliding with the cheek 70 when closed. The same device 50 can also be used to prevent the flap 14 from colliding with the cheek 70 on the other side when it is open, for which purpose only a second abutment is provided in the vicinity of the open position, on which the two gas springs 54, 56 can be alternately supported in a corresponding manner.

As can be seen from the above views, the corner element 70 thus has an unstable equilibrium position between its two end positions, as shown in the middle views of fig. 4 and 5. Away from this unstable equilibrium position, either the first gas spring 54 is deflected relative to the second gas spring 56 or the second gas spring 56 is deflected relative to the first gas spring 54, with the result that the respective

undeflected gas spring

54, 56 pushes the sliding leaf 14 in the direction of its open or closed position, for which purpose the respective

undeflected gas spring

54, 56 bears on the abutment 60, thereby overcoming the force component of the respective deflected

gas spring

56, 54 that is aligned with the

undeflected gas spring

54, 56. Thus, the first gas spring 54 pushes the slide 14 in the direction of the closed position of the slide 14 against the pretensioning force of the second gas spring 56 in the first end switching position of the corner element 70, while the second gas spring 56 pushes the slide 14 lifting the slide element 10 in the direction of the open position of the slide 14 against the pretensioning force of the first gas spring 54 in the second end switching position of the corner element 70.

In order to prevent the corner element 70 from pivoting beyond its first or second end switching position, a first stop (not shown in greater detail here) can be formed on the first leg 72 of the corner element 70, with which a first gas pressure spring comes into contact in the first end switching position. In a corresponding manner, a second stop (not shown in greater detail here) can be formed on the second leg 74 of the corner element 70, with which the second gas spring 56 comes into contact in the second end switching position.

Although the corner element 70 of the switching mechanism 58 can be transferred into its second end-switch position in the manner described above by means of a manually applied opening pulse; the device 50 can also have an actuating mechanism with which the switching mechanism 58, in particular its corner element 70, interacts at least in the closed position of the lifting slide element, so that when the sliding leaf 14 of the lifting slide element 10 is lowered, the corner element 70 is transferred from its first end switching position to its second end switching position. For example, the angle element 70 may be positively coupled with a gear wheel lifting the slide element 10, by means of which the slide 14 can be raised and lowered, so that when the slide 14 is lowered, the angle element 70 is transferred to its second end switching position.

List of reference numerals

10. Lifting sliding door

12. Frame

14. Sliding fan

16. Fan frame

18 12 upper leg

20 12 lower leg

22 16 upper leg

24 22 of the groove

26 18 of the groove

50. Device for measuring the position of a moving object

52. Base body

54. First pre-tensioning element, first gas-pressure spring

56. A second pre-tensioning element, a second gas spring

58. Switching mechanism

60. Support base

62 54 first end of the

64 54 second end

66 56 first end

68 56 second end

70. Corner element/switching element

72 70 first leg

74 70 second leg

76. A rotary joint.

Claims

1. A device (50) for assisting the closing and opening of a lifting slide element (10), such as a lifting slide door (10) or a lifting slide window, comprising:

-a base body (52) designed to be attached to a fan frame (16) of a lifting sliding element (10);

-an axially extending first pre-tensioning element (54), in particular a first gas pressure spring (54), having a first end (62) and a second end (64) hinged to the base body (52);

-an axially extending second pre-tensioning element (56), in particular a second gas spring (56), having a first end (66) and a second end (68) hinged to the base body (52); and

-a switching mechanism (58) having a first limit-switch position and a second limit-switch position, the first end (62) of the first pretensioning element (54) being coupled to the first end (66) of the second pretensioning element (56) by the switching mechanism (58) with the first and/or second pretensioning element (56) pretensioned;

wherein the switching mechanism (58) has an unstable equilibrium position between its two end switching positions, wherein the first pretensioning element (54) and the second pretensioning element (56) are aligned with each other only in the unstable equilibrium position.

2. The apparatus of claim 1, wherein the first and second electrodes are disposed on opposite sides of the housing,

it is characterized in that the preparation method is characterized in that,

in the state of the device mounted on a lifting slide element (10), a first pretensioning element (54) in a first end switching position of the switching mechanism (58) pushes the lifting slide element (10) in the direction of its closed position against the pretensioning force of a second pretensioning element (56), and a second pretensioning element (56) in a second end switching position of the switching mechanism (58) pushes the lifting slide element (10) in the direction of its open position against the pretensioning force of the first pretensioning element (54).

3. The apparatus of claim 1 or 2, wherein,

it is characterized in that the preparation method is characterized in that,

the device (50) further comprises an abutment (60) designed for attachment to a fixed part, in particular to the top or fan frame (12) of the lifting slide element (10), wherein a first end (62) of the first pre-tensioning element (54) is supported on the abutment (60) to push the lifting slide element (10) in the direction of its closed position against the pre-tensioning force of the second pre-tensioning element (56), and a first end (66) of the second pre-tensioning element (56) is supported on the abutment (60) to push the lifting slide element (10) in the direction of its open position against the pre-tensioning force of the first pre-tensioning element (54).

4. The apparatus of claim 3, wherein the first and second electrodes are disposed in a common plane,

it is characterized in that the preparation method is characterized in that,

the base (60) is designed to be elastically flexible perpendicularly to the axial extension of the first pre-tensioning element (54) and of the second pre-tensioning element (56).

5. The device according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the switching mechanism (58) has an angled L-shaped switching element (70) having a first leg (72) and a second leg (74) which are preferably aligned substantially perpendicularly to one another, wherein the first end (62) of the first pretensioning element (54) is hinged to the free end of the first leg (72) and the first end (66) of the second pretensioning element (56) is hinged to the free end of the second leg (74).

6. The apparatus as set forth in claim 5, wherein,

it is characterized in that the preparation method is characterized in that,

the first leg (72) forms a first stop, the first pretensioning element (54) contacting the first stop in the first end switch position, and the second leg (74) forms a second stop, the second pretensioning element (56) contacting the second stop in the second end switch position.

7. The device according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the switching mechanism (58), in particular a switching element (70) of the switching mechanism, is mounted displaceably on the base body (52), in particular by means of a rotary joint (76) which can be displaced relative to the base body (52), and is fixed on the base body against lifting forces, the intersection of the two legs of the switching element lying on the axis of rotation of the rotary joint.

8. The device according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the first pretensioning element (54) and the second pretensioning element (56) are identical in structure and in particular have the same spring stiffness.

9. The device according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the first pretensioning element (54) and the second pretensioning element (56) are pretensioned irrespective of their position/deflection.

10. The device according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

in the closed position of the lifting slide element (10), the pretensioning force of the first pretensioning element (54) is balanced by a force component of the pretensioning force of the second pretensioning element (56) acting in the direction of the first pretensioning element (54).

11. The device according to any one of the preceding claims,

it is characterized in that the preparation method is characterized in that,

the device (50) comprises an actuating mechanism with which the switching mechanism (58) interacts in the closed position of the lifting slide element (10) such that the switching mechanism (58) pivots from its first end switching position to its second end switching position when the lifting slide element (10) is lowered.

12. Lifting sliding element (10), in particular lifting sliding door (10) or lifting sliding window, with a device (50) according to at least one of the preceding claims, the base body (52) of which is attached to the sash frame (16) or to the cheek (12) of the lifting sliding element (10).

13. The lifting slide element of claim 12,

it is characterized in that the preparation method is characterized in that,

the fan frame (16) comprises an upper fan leg (22) in which an upwardly open recess (24) is formed, in which the base body (52) or the abutment (60) of the device (50) comprising the first and second pretensioning elements (54, 56) and the switching mechanism (58) is arranged.

14. The lifting slide of claim 13,

it is characterized in that the preparation method is characterized in that,

the seat (60) or the base body (52) of the device (50) comprising the first pretensioning element (54) and the second pretensioning element (56) and the switching mechanism (58) are arranged in a downwardly open groove (26) which is formed in the upper leg (18) of the cheek (12) of the lifting sliding element (10).