EP3709839B1 - Attachment device for a panel of a drawer - Google Patents

Description

The invention relates to a fastening device for fastening a panel of a drawer to a frame according to the preamble of claim 1.

In the DE 94 21 872 U1 describes a fastening device for fastening the front panel of a drawer to drawer carriages. The fastening device has an additional locking device provided in addition to a retaining spring, which according to FIG. 15 has a self-locking force-locking or clamping effect and according to FIG. 21 a form-locking effect. In this way, a safety function is to be implemented in order to prevent the device from coming loose unintentionally—for example, due to very heavy stress from shaking movements or the like—even more reliably.

A generic fastening device is from DE 20 2014 002 0229 U1 known.

The object of the invention is to realize a fastening device that is structurally simple to implement and yet functionally reliable.

The invention solves this problem by the subject matter of claim 1.

Provision is made for the catch element to be locked in the catch position as a result of a local displacement of the axis of rotation of the catch element. wherein to shift the axis of rotation of the catching element, a linear shifting of a shaft section takes place, which is pivotably mounted in or with the catching element. In addition, the shifting of the axis of rotation is defined by a guide cam and at least one connecting link of the base element, with the respective guide cam being formed as an extension of the shaft section is.

The rotational movement or the pivoting of the catching element about its axis of rotation is superimposed or preceded or followed by a movement of the axis of rotation that locally shifts the axis of rotation—preferably linearly. This defined shift in the position of the axis of rotation can in particular by shifting the Central axis of an axle section or bolt or the like. Take place with or on which the catch element of the safety gear is pivotally mounted. The position is shifted into a catch position, which is selected in such a way that an additional locking effect results from the shift in the axis of rotation.

The displacement of the axis of rotation is defined by a guide cam and a backdrop. This results in a defined displacement of the axis of rotation that is easy to implement in terms of production technology and is therefore advantageous.

It is advantageously provided that the direction of movement of the axis of rotation of the catch element when it is displaced is aligned perpendicularly or substantially perpendicularly to a direction of movement of the holding element when the holding element is locked on the catch device.

In addition, in order to achieve an effective locking mechanism, it can be provided that the axis of rotation is displaced in such a way that, in the catch position, it is in the Y direction perpendicular to the main direction of extension of the frame at or close to the Y position of the central axis of a retaining bolt of a retaining element achieved that the current axis of rotation of the catch element in the locked or locked state of the fastening device can preferably be just below or above the plane of action or on the plane of action of the retaining element, in particular a retaining bolt of the retaining element on the panel. The effective plane is defined here by the plane spanned between the X and Z axes, which runs parallel to the base (6) of the frame. As a result, an opening movement of the drawer, which is accompanied by the exertion of force on the panel, can only exert a very small amount of torque or even no torque at all on the catch element, so that it is advantageously virtually impossible to overcome the locking mechanism simply by opening the drawer .

An additional bolt--for example, a form-fitting bolt that keeps the catching element locked in the holding position, or the implementation of a clamping effect that holds the holding element--are therefore no longer required.

Provision can advantageously be made for the displacement of the axis of rotation of the catch element to be defined by a mechanical control device which links the displacement of the axis of rotation with the pivoting position of the catch element. In this way, a precise and defined movement into the catch position and out of the release position is implemented.

It is structurally simple and safe if the mechanical control device is formed by corresponding teeth. Thus, according to an advantageous embodiment, the toothing can comprise a toothing of the catching element and a corresponding toothing of the base element.

For example, the toothing of the base element can be configured in a simple and advantageous manner as linear toothing, preferably as a toothed rack, which is arranged or configured on the base element.

In a further preferred embodiment of the invention, the displacement of the axis of rotation of the catch element is supported by the rolling of teeth on the catch element on teeth on the base element. As a result, the displacement of the axis of rotation can be reproduced by simple kinematics and is thus advantageously supported. The toothing of the base element can be designed in a simple manner as a linear toothing, such as a toothed rack, which is arranged or formed on the base element.

In a further preferred embodiment of the invention, the base element of the fastening device has a housing that is formed by a first, right housing half and a second, left housing half, with each housing half having the connecting link. As a result, a housing is simply and advantageously formed in which the catch element is securely mounted. Furthermore, the connecting link can be designed in a simple manner in terms of manufacturing technology.

In a particularly preferred variant, at least one half of the housing is connected directly to a wall surface of the frame.

In a further preferred embodiment variant of the invention, the holding element has a holding part which is fastened to the base part and a U-shaped

Can have cross-sectional geometry and a retaining bolt, the U is then dimensioned such that the clear width of the U is greater than the width B of the housing. This ensures in a simple and advantageous manner that the retaining bolt can engage in the notch of the catching element without any interfering contours.

In a further preferred embodiment variant of the invention, the holding element has an adjustment device. As a result, the adjustment of the position of the screen relative to the frames in the vertical direction is ensured in a structurally simple and advantageous manner.

In a further preferred embodiment of the invention, the catching element has a semicircular recess into which a geometrically congruent, circularly formed end of the guide element of the force accumulator, in particular a spring device, engages. This creates a swivel joint with which the spring device is in an operative connection with the catch element. Due to the swivel joint, the spring device advantageously acts on the catch element at all times without a bending moment.

In a further preferred embodiment of the invention, a drive geometry for a tool is introduced into the catch element. In interaction with the tool, the drive geometry serves in a simple manner in terms of design and production technology and is therefore advantageous as an unlocking and return option for the catch element.

Further advantageous configurations of the invention can be found in the dependent claims.

Figur 1:

eine räumliche Ansicht eines Ausschnitts eines Schubkastens mit einer erfindungsgemäßen Befestigungsvorrichtung für eine Blende des Schubkastens;

Figur 2:

eine räumliche Ansicht einer Seitenzarge des Schubkastens aus Fig. 1 mit einer Befestigungsvorrichtung für eine Blende des Schubkastens aus Fig. 1;

Figur 3:

eine räumliche Ansicht des in die Seitenzarge aus Fig. 2 eingesetzten Teils der Befestigungsvorrichtung aus Fig. 2 für eine Blende des Schubkastens aus Fig. 1

Figur 4:

eine räumliche Ansicht der Befestigungsvorrichtung aus Fig. 2 für eine Blende des Schubkastens aus Fig. 1

Figur 5:

eine räumliche Ansicht der Befestigungsvorrichtung aus Fig. 4 für eine Blende des Schubkastens aus Fig. 1, wobei ein Gehäuseblech des in die Seitenzarge aus Fig. 2 eingesetzten Teils der Befestigungsvorrichtung aus Fig. 2 nicht dargestellt ist;

Figur 6:

eine Seitenansicht der Befestigungsvorrichtung aus Fig. 5 für eine Blende des Schubkastens aus Fig. 1, wobei hier eine Ausgangsstellung vor der Montage der Blende dargestellt ist;

Figur 7:

eine Seitenansicht der Befestigungsvorrichtung aus Fig. 5 für eine Blende des Schubkastens aus Fig. 1, wobei hier ein Montagefortschritt gegenüber der Ausgangsstellung aus Fig. 6 erkennbar ist;

Figur 8:

eine Seitenansicht der Befestigungsvorrichtung aus Fig. 5 für eine Blende des Schubkastens aus Fig. 1, wobei hier ein weiterer Montagefortschritt gegenüber der Darstellung in Fig. 7 erkennbar ist;

Figur 9:

eine Seitenansicht der Befestigungsvorrichtung aus Fig. 5 für eine Blende des Schubkastens aus Fig. 1, wobei hier ein weiterer Montagefortschritt gegenüber der Darstellung in Fig. 8 erkennbar ist;

Figur 10:

eine Seitenansicht der Befestigungsvorrichtung aus Fig. 5 für eine Blende des Schubkastens aus Fig. 1, wobei hier eine Endstellung nach der Montage der Blende dargestellt ist;

Figur 11:

eine räumliche Explosionsansicht des in die Seitenzarge aus Fig. 2 eingesetzten Teils der Befestigungsvorrichtung aus Fig. 2 für eine Blende des Schubkastens aus Fig. 1.

The invention is explained in more detail below with reference to the drawing using exemplary embodiments, with further advantages of the invention also becoming clear. It should be emphasized that the exemplary embodiment discussed below is not intended to describe the invention conclusively, but that variants and equivalents that are not shown can also be implemented and are covered by the claims. Indefinite articles such as "a" are not to be understood as a numeral, but - unless otherwise defined - in the sense of "at least one". It shows:

Figure 1:

a spatial view of a section of a drawer with a fastening device according to the invention for a panel of the drawer;

Figure 2:

a spatial view of a side frame of the drawer 1 with a fastening device for a panel of the drawer 1 ;

Figure 3:

a three-dimensional view of the side frame 2 inserted part of the fastening device 2 for a panel of the drawer 1

Figure 4:

a spatial view of the fastening device 2 for a panel of the drawer 1

Figure 5:

a spatial view of the fastening device 4 for a panel of the drawer 1 , whereby a housing sheet of the in the side frame out 2 inserted part of the fastening device 2 is not shown;

Figure 6:

a side view of the fastening device figure 5 for a panel of the drawer 1 , with a starting position being shown here before the panel is installed;

Figure 7:

a side view of the fastening device figure 5 for a panel of the drawer 1 , whereby here an assembly progress compared to the starting position 6 is recognizable;

Figure 8:

a side view of the fastening device figure 5 for a panel of the drawer 1 , whereby here a further assembly progress compared to the illustration in 7 is recognizable;

Figure 9:

a side view of the fastening device figure 5 for a panel of the drawer 1 , whereby here a further assembly progress compared to the illustration in 8 is recognizable;

Figure 10:

a side view of the fastening device figure 5 for a panel of the drawer 1 , whereby here an end position is shown after assembly of the screen;

Figure 11:

a spatial exploded view of the side frame 2 inserted part of the fastening device 2 for a panel of the drawer 1 .

Terms such as "top", "bottom", "right" or "left" refer to the respective position shown in the figures and are to be understood or considered relative to movements - in particular rotations - of the elements shown in space.

In 1 a drawer 1 is shown. The drawer 1 has a panel 2 , a base 6 and preferably a rear wall 3 . The drawer 1 also has a first, right frame (not shown here) and a second, left frame 4b.

4 shows an advantageous embodiment of a fastening device 100 for fastening the panel 2 of the drawer 1 to the frame 4a or 4b. The fastening device 100 has a retaining element 101 on the panel side and a catch device on the frame side. The catch device has a catch element 116 which is arranged pivotably on the respective frame.

The catch element 116 can be acted upon by a force accumulator, in particular a spring device 104, and can be moved between a release position and a catch position and holds the retaining element 101 of the panel on the frame 100 in the catch position.

The frames 4a, 4b can be made of a metallic material and have a cavity into which the catching device of the fastening device 100 for the panel 2 of the drawer 1 is inserted. But this safety gear can also be arranged in a different way on the frame 4a, 4b. In the catch position, the holding element 101 can also engage in the cavity of the frame 4a, 4b, which is preferably aligned at right angles to the panel.

In order to actuate the fastening device 100, in particular to be able to unlock and release it, the frame 4a, 4b can each have a cutout 5b through which the fastening device 100 inserted into the respective frame 4a, 4b can be accessed and operated from the outside.

In 2 the left frame 4b is shown without the adjoining parts of the drawer 1. In turn, a safety catch of a fastening device 100 is inserted into a cavity of the frame 4b. An additional holding element 101, which is fastened to the screen 2, is not shown here.

In 3 is an advantageous embodiment of a frame-side catch device of the fastening device 100 without the frame 4a, 4b surrounding it when mounted on the drawer and without the holding element 101 in a basic position, in which the catch device is in a release position. In this position, the holding element 101 and thus the panel are not held on the frame 4a, 4b.

The fastening device 100 of 3 and 4 has a base element 102 . This base element 102 can be formed by an element of the frame 4a, 4b itself. However, it can also be formed by a separate element which is fixed to the frame 4a, 4b, for example inserted into a cavity of the frame 4a, 4b and fixed to an element of the frame 4a, 4b. The base element 102 can be designed as at least one plate. The base element 102 is used for arranging and also as an abutment for an energy accumulator. This force accumulator is preferably designed as a spring device. Therefore, the term "spring device" is used below, which includes a force accumulator of a different type below - but also in the claims.

The spring device 104 has a compression spring here. Alternatively, the spring device 104 can also have another spring with a different design. The spring device 104 also has a guide element 105 . The guide element 105 is slidably mounted in the retaining bracket 103. The guide element 105 has a stop 106 for the compression spring 104 . The compression spring of the spring device 104 is arranged between the holding tab 103 and the stop 106 .

The fastening device 100 has, as a base element 102, a housing with a first, right-hand housing half 107a and a second, left-hand housing half 107b running parallel thereto. The housing halves 107a, 107b are connected to one another here (here with rivets) and thus form the housing 108. The housing halves 107a, 107b are here made from a flat metal material, such as sheet steel. Alternatively, the housing halves 107a, 107b can also be made of a different material, such as aluminum or a plastic or the like.

The base element can have a connecting link 109 in which a guide cam 110 is movably mounted. Here, each of the housing halves 107b, 107a has a link 109 in which the guide cams 110 are movably mounted. Furthermore, one, here the second, left housing half 107b can have a recess 111. A curved elongated hole 112 is visible through this recess 111, which hole is made in the first, right-hand housing half 107a.

Both housing halves 107a, 107b each have a groove-like cutout 114a, 114b that is geometrically congruent with the other cutout. The cutout 114a, b is in a locking position of the fastening device 100 by a retaining bolt 115 of the retaining element 101 in a horizontal position (not shown here, see 4 ) cracked down. A catch element 116 also engages in the cutout 114 .

In the 4 the holding element 101 is shown. The holding element 101 has a base part 117 with which the holding element 101 is fastened to the panel 2 of the drawer 1 . The holding element 101 also has a holding part 118 which is fixed to the base part 117 and has a U-shaped cross-sectional geometry. The U is dimensioned such that the clear width of the U is greater than the width B of the housing 108. The holding part 118 has two indentations 119a, 119b arranged in pairs, which, when locking or after locking, open the aperture in the horizontal direction lead to the housing 108 or set. For adjustment The holding element 101 has an adjusting device 120 for the relative position of the screen 2 to the frames 4a, 4b in the vertical direction.

In figure 5 the fastening device is shown without the left housing half 107b. As a result, the catching element 116 is easily recognizable. The catch element 116 has teeth 121 . The base element 102 also has teeth 122 . Both toothings 121, 122 mesh with one another and are thus in an operative connection with one another. The teeth 121, 122 are preferably involute teeth. Other toothings are also conceivable. The central planes of the catch element 116, the toothing of the base element 102 and the compression spring 104 are all in one plane in the longitudinal direction of the frame, which is why the width B of the housing with its parallel housing halves can be less than 8 mm and, in particular, all forces can be dissipated in one plane without generating a tilting moment.

The catching element 116 has a semicircular recess 123 into which a geometrically congruent, circularly shaped end 124 of the guide element 105 of the spring device 104 engages. This creates a pivot. As a result, the spring device 104 is in an operative connection with the catch element 116 . Due to the swivel joint, the spring device 104 advantageously acts on the catch element 116 at all times without any bending moments.

The catching element 116 also has a groove-like incision 125 . The boundaries of the incision 125 are preferably curved—parallel to one another. The dimension of the incision 125 is selected such that the retaining pin 115 of the retaining element 101 can reach through the incision 125 in the horizontal direction at any point with virtually no play. A hook portion 127 is formed in the catching element 116 through the incision 125 .

Also shown is the guide cam 110, which is guided in the link 109 (not shown here) of the left-hand housing half 107b (also not shown here). Such a guide cam 110 is guided in the link 109 of the right-hand housing half 107a (not shown here). A cylindrical shaft section 126 is arranged between the two guide cams 110 . The catch element 116 is mounted pivotably on the axle section 126 .

A drive geometry 113 can also be seen, which is introduced into the catch element in the area by a separating process - such as punching - here in the form of a cross slot. The drive geometry 113 is used in conjunction with a tool - here a Phillips screwdriver - as an unlocking and return option for the catch element 116. The tool penetrates the drive geometry 113 and can at least engage in the slot 112 of the first, right-hand housing half 107a.

The elongated hole 112 accordingly serves as a free space for a screwdriver tip, so that there is a secure form fit between the drive geometry 113 and the screwdriver tip. Drive geometries 113 other than the cross slot shown here are also conceivable.

In the Figures 6 to 10 a locking process of the fastening device 100 is shown in various stages.

In 6 the fastening device 100 is shown without the frame 4a, 4b surrounding it, but with the retaining element 101 in a basic position in which the fastening device 100 is open. The representation in 6 corresponds in this respect to the representation of the fastening device 100 in figure 5 .

In 7 the fastening device 100 is shown in a position in which the retaining bolt 115 engages in the cutout 114a, 114b, which the two housing halves 107a, 107b each form and comes into contact with the catch element 116.

The impressions 119a, 119b of the holding part 118 have placed over the two housing halves 107a, 107b (only 107a shown here), so that the holding pin 115 engages centrally in the cutout 114a, 114b. In its representation, the holding part is cut out on one of its legs, so that the holding pin 115 is visible.

The catch element 116 has its basic position 6 and has completed a partial clockwise rotation about the axle section 126 as a result of the movement of the retaining bolt 115 on the catching element 116 and has shifted the line of action of the spring force to such an extent that an automatic rotary movement of the catching element 116 takes place, with the spring force of the spring element 104 or that stored in the compression spring Force movement of retaining pin 115 into cutout 114a, 114b has supported. This movement is possible because the central axis of the retaining pin 115 acts on the catch element 116 at a vertical distance from the current position of the central axis of the axle section 126 and thereby exerts a torque on the catch element 116 which acts in a clockwise direction.

The toothing 121 of the catching element 116 has rolled a bit on the toothing 122 of the base element 102 . Due to the rolling movement, the axle section 126 - and thus the current axis of rotation of the catching element 116 - has moved a little way vertically downwards via the guide cam 110 which is integrally formed on the axle section 126 and which is displaceably guided in the connecting link 109.

In 8 the fastening device 100 is shown in a position in which the retaining bolt 115 engages in the cutout 114a, 114b and in which the notch 125 or the hook section 127 of the catching element 116 engages with the retaining bolt 115.

The catch element 116 has the spring force of the spring element 104 or the force stored in the compression spring compared to 7 completed a further partial rotation around the axis section 126 in the clockwise direction.

The toothing 121 of the catch element 116 has rolled a further distance on the toothing 122 of the base element 102 . Due to the rolling movement, the axle section 126 - and thus the current axis of rotation of the catch element 116 - has moved over the guide cam 110 which is integrally formed on the axle section 126 and which is guided displaceably in the connecting link 109, compared to 7 moved a little further vertically down.

In 9 the fastening device 100 is shown in a position in which the retaining bolt 115 engages in the cutout 114a, 114b and in which the notch 125 or the hook section 127 of the catching element 116 pushes the retaining bolt 115 and thus the retaining element 101 further into the cutout 114a, 114b pulled in. As a result, the panel 2 (not shown here) is pulled further to the respective frame 4a, 4b of the drawer 1. The catch element 116 has the spring force of the spring element 104 or the force stored in the compression spring in turn comparison to 8 completed a further partial rotation around the axis section 126 in the clockwise direction.

The toothing 121 of the catch element 116 has rolled a further distance on the toothing 122 of the base element 102 . Due to the rolling movement, the axle section 126 - and thus the current axis of rotation of the catch element 116 - has moved over the guide cam 110 which is integrally formed on the axle section 126 and which is guided displaceably in the connecting link 109, compared to 8 moved a little further vertically down.

In 10 the fastening device 100 is shown in a locking end position in which the retaining bolt 115 engages in the cutout 114a, 114b and in which the retaining bolt 115 lies at the bottom of the incision 125. As a result, the panel 2 (not shown here) has come to rest against the respective frame 4a, 4b of the drawer 1 and is locked against unintentional release.

The catch element 116 has the spring force of the spring element 104 or the force stored in the compression spring compared to 8 completed a further partial rotation around the axis section 126 in the clockwise direction up to a possible end point.

The toothing 121 of the catch element 116 has rolled a further distance on the toothing 122 of the base element 102 . Due to the rolling movement, the axle section 126 - and thus the current axis of rotation of the catch element 116 - has moved over the guide cam 110 which is integrally formed on the axle section 126 and which is guided displaceably in the connecting link 109, compared to 9 moved a little further vertically down to the lower end point of link 109.

As a result, the current axis of rotation of the catch element 116 and/or the central axis of the axle section is just below the plane of action A or on the plane of action of the retaining bolt 115 in the cutout 114a, 114b. As a result, only a very small or no torque can be exerted on the catch element 116 by an opening movement of the drawer 1, which is accompanied by the exertion of force on the panel 2, so that the locking alone can be overcome is advantageously virtually excluded by an opening movement of the drawer 1.

Furthermore, the catch element 116 has come to rest against the base element 102, so that further rotation of the catch element 116 in the clockwise direction is not possible.

The retaining bolt 115 is thus locked by a defined displacement of the axis of rotation or the central axis of the axle section 126 on which the catch element 116 is pivotably mounted. The displacement is defined by the guide cam 110 and the link 109 and is supported by the rolling of the teeth 121 of the catch element 116 on the teeth 122 of the base element 102 .

The fastening device 100 can only be unlocked by rotating the catch element 116 counterclockwise, which is initiated by a tool inserted into the drive geometry 113 . In doing so, the spring force of the spring element 104 must be overcome.

In 11 the fastening device 100 is shown without the holding element 101 in a three-dimensional exploded view. The shaft section 126, on which the catch element 116 is pivotably mounted, and the two guide cams 110 integrally formed on the shaft section 126 are clearly visible.

Reference List

1

drawer

2

cover

3

back panel

4a, 4b

frame

5a, 5b

cutout

6

floor

100

fastening device

101

holding element

102

base element

103

retaining tab

104

spring device

105

guide element

106

attack

107a, 107b

case half

108

Housing

109

backdrop

110

guide cam

111

recess

112

Long hole

113

drive geometry

114a, 114b

cutout

115

retaining bolts

116

catch element

117

base part

118

holding part

119a, 119b

imprint

120

adjusting device

121

gearing

122

gearing

123

recess

124

molded end

125

incision

126

axis section

127

hook section

A

effective level

B

Broad

X,YZ

Axles

Claims (12)

1. Attachment device (100) for attaching a front panel (2) of a drawer (1) to a frame (4a, 4b), wherein the attachment device (100) has a holding element (101) which can be arranged on the front panel side and a catch device which can be arranged on the frame side and has a catch element (116) mounted on a base element (102) so as to be pivotable about an axis of rotation, which can be loaded with force by a force accumulator and can be moved back and forth between a release position and a catch position, wherein the catch element (116) is designed, in the catch position, to hold the holding element (101) on the frame, wherein the catch element is locked in the catch position by means of a local displacement of the axis of rotation of the catch element (116), wherein in order to displace the axis of rotation of the catch element (116), a linear displacement of an axle section (126) is effected, which is pivotably mounted in or with the catch element (116), characterized in that the displacement of the axis of rotation is defined by a guide cam (110) and at least one slotted link (109) of the base element (102), wherein the respective guide cam (110) is in extension of of the axle section (126).
2. Attachment device (100) according to one of the preceding claims, characterized in that the direction of movement of the axis of rotation of the catch element (116) during its displacement is perpendicular or substantially perpendicular to a direction of movement of the holding element (101) when the holding element is locked to the catch device.
3. Attachment device (100) according to one of the preceding claims, characterized in that the displacement of the axis of rotation of the catch element (116) is defined by a mechanical control device linking the displacement of the axis of rotation to the pivoting position of the catch element (116).
4. Attachment device (100) according to claim 3, characterized in that the mechanical control device is formed by corresponding toothings.
5. Attachment device (100) according to claim 4, characterized in that the toothings comprise a toothing (121) of the catch element (116) and a corresponding toothing (122) of the base element (102).
6. Attachment device (100) according to claim 5, characterized in that the toothing (122) of the base element (101) is formed as a linear toothing, preferably a rack, which is arranged or formed on the base element.
7. Attachment device (100) according to one of the preceding claims, characterized in that the base element (102) is designed as a housing (108) which is formed by a first, right housing half (107a) and a second, left housing half (107b), and in that the respective housing halves (107a, 107b) each have corresponding slotted links (109).
8. Attachment device (100) according to one of the preceding claims, characterized in that the base element (102) has a retaining bracket (103) which serves as an abutment for a spring of the spring device (104), and in that the spring device (104) has a guide element (105) which is displaceably mounted in the retaining bracket (103) and has a stop (106).
9. Attachment device (100) according to one of the preceding claims, characterized in that the base element has/have a groove-like cutout (114a, 114b) which, in a locking position of the attachment device (100), is penetrated by the retaining bolt (115) of the holding element (101) in a horizontal position.
10. Attachment device (100) according to one of the preceding claims, characterized in that the catch element (116) has a semicircular recess (123) in which an end (124) of the guide element (105) of the spring device (104) engages, said end (124) being geometrically congruent therewith and integrally formed in a circular shape.
11. Attachment device (100) according to one of the preceding claims, characterized in that a drive geometry (113) for a tool is incorporated in the catch element (116).
12. Attachment device (100) according to one of the preceding claims, characterized in that the holding element (101) is firmly connectable to the front panel (2) and that it has a retaining bolt (115).

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