drawer

The drawer design with a mounting device simplifies assembly by reducing components and enabling automatic positioning of tall front panels, addressing the complexity of existing drawer assembly methods.

DE102024129161A1Pending Publication Date: 2026-04-09PAUL HETTICH GMBH & CO KG
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-10-09
Publication Date
2026-04-09

AI Technical Summary

Technical Problem

Existing drawer assembly methods require multiple components and are cumbersome, especially for tall drawers, necessitating the release of multiple catches during assembly.

Method used

A drawer design with a mounting device that connects side panels and a front panel using a retaining element and a support element, allowing for a single locking position and a movable pre-assembly position, reducing components and simplifying assembly by enabling the front panel to be automatically pulled into place after initial positioning.

Benefits of technology

Reduces the number of required components and simplifies the assembly process, particularly for high front panels, while maintaining structural integrity and force transmission.

✦ Generated by Eureka AI based on patent content.

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Abstract

1. Drawer (10) comprising a base (11), a front panel (13), a back panel (14) and two side rails (12) defining an interior of the drawer, and with two extension guides (201) arranged below the side rails for extending the drawer (10) from a furniture carcass, wherein the two side rails (12) and the front panel (13) are connected to each other by means of a mounting device (1), wherein the side rails (12) have at least in one area facing the front panel (13) a receiving channel (1242) for receiving one of the two extension guides (201), wherein each mounting device (3) has at least one retaining element (31) that is fixed in the respective side rail (12) and a support element (32) that has a locking section (324) and at least one support surface (321) and that is fixed to the respective front panel (12),and wherein each mounting device (3) has a locked first position (P1) in which the holding means (31) and the support means (32) are fixed and / or locked to one another – a locking position (P1) – and wherein each of the mounting devices (3) is displaceable from this first position perpendicular to the front panel (13) to a second position – a pre-assembly position (P2) – in which the holding means (31) and the support means (32) are not yet locked to one another and are separable or lockable to one another, wherein the at least one support surface (321) is supported in both the first position (P1) and the second position (P2) directly on a support surface (313) or directly on a support surface (313) via a support element (3103) for thickening the support surface (313) of the receiving channel (1242).
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Description

[0001] The present invention relates to a drawer according to the preamble of claim 1.

[0002] In drawers of this type, the drawer slide is mounted within the drawer side, and during assembly, the front panel is preferably pulled automatically against the drawer side after an initial positioning. Especially with tall drawer sides, it is common practice to mount two front panel supports to the front panel, which are also secured by two catches to absorb the forces. Both catches must then be released, either individually or together. Furthermore, these solutions require many components.

[0003] The invention aims to solve this problem.

[0004] The present invention solves this problem with a drawer having the features of claim 1.

[0005] The invention provides a drawer with a base, a front panel, a back panel, and two side panels that define an interior of the drawer, preferably open on at least one upper side, and with two drawer slides arranged below the side panels for pulling the drawer out of a furniture carcass and for pushing it into a furniture carcass, wherein the two side panels and the front panel are each connected to one another by means of a mounting device, wherein the side panels have at least in one area facing the front panel a receiving channel for receiving one of the two drawer slides, wherein each mounting device has at least one retaining element that can be fixed in the respective side panel, and a support element that has a locking section and at least one support surface and that can be fixed to the respective front panel.and wherein each mounting device has a locked first position in which the holding means and the support means are fixed and / or locked to one another – a locking position – and wherein each of the mounting devices is movable, in particular displaceable, from this first position perpendicular to the front panel into a second position – a pre-assembly position – in which the holding means and the support means are not yet locked to one another and are separable from one another or lockable to one another, wherein the at least one support surface is supported in both the first position and the second position directly on a support surface or directly on a support surface via a support element for thickening the support surface of the receiving channel.

[0006] According to claim 1, the number of components required is significantly reduced in the case of a high frame, and operation is considerably simplified.

[0007] The locked first position of the mounting device preferably corresponds to a mounted state of the front panel on the side frame, or on the respective side frame of the drawer, wherein moving the mounting device into the pre-locked second position allows the front panel to be removed from the side frames. The mounting device can, of course, also be moved from the pre-locked position to the locked first position. In the context of the present invention, locking or a locked position of the mounting device means, in particular, that the front panel cannot be removed from the respective side frame in this position of the mounting device. The front panel can be removed from the respective side frame in the second position of the mounting device.

[0008] Thus, even with relatively high front panels, only one mounting device per side frame is required. Claim 1 also includes, in particular, embodiments in which a single front panel is fixed to each of the side frames by only one of the described mounting devices on the respective side frame. This is cost-effective and simple. The invention can also be used with lower front panels. The invention is preferably applicable to drawers of the type described above, in which the drawer slide is mounted within the frame and the front panel is brought into a pre-assembly position, and in which, during assembly, the front panel is preferably automatically pulled against the frame after an initial positioning in the pre-assembly position.

[0009] The claims relate in particular to the respective individual mounting devices of the two side frames.

[0010] In a preferred optional embodiment, it can be advantageously provided that the receiving channel has a horizontal wall section and at least one further wall section, wherein the bearing surface is formed as a surface area of ​​the upper horizontal wall section of the receiving channel or the thickening. This is because a good force transmission from the receiving channel to the extension guide can occur precisely at this wall section.

[0011] In a further preferred embodiment, the respective extension guide can be positioned in the receiving channel, specifically against the underside of the upper horizontal wall section. This arrangement effectively ensures that the weight of the front panel is at least partially transferred from the support surface to the respective bearing surface and from the bearing surface to the respective extension guide.

[0012] It may be further preferably provided that the holding element has a guide track open on one side, in which the locking section formed on the support element can be guided when changing or moving between the first and second positions. Alternatively, it may be further preferably provided that the holding element has a guide track in which the support element itself can be guided in the area of ​​the locking section when changing or moving between the first and second positions. This is particularly advantageous when the drawer slide is mounted inside the frame and brought into the pre-assembly position, and when, during assembly, the cover is preferably automatically pulled against the frame after an initial positioning in the pre-assembly position.

[0013] In a further preferred embodiment, the support element can be designed as a support rib of a support bracket for the holding device. The support element acts, in particular, as a material reinforcement of the supporting surface and further optimizes the force transmission of the weight force into the extension guide. This means that the resulting forces are successfully redirected in the side frame, preventing unfavorable moments that the side frame cannot absorb.

[0014] It is therefore preferred that the receiving channel for the drawer slide is formed entirely on a bottom channel crossbar of the respective side frame. This is structurally simple and cost-effective.

[0015] The invention is also well suited for embodiments in which the receiving channel for the extension guide is formed by at least two frame adapters offset in the extension direction of the drawer.

[0016] It may further be expedient to provide that the holding means has a gripping means which secures the locking section in the first position against being pulled out, the gripping means being pre-tensioned by means of a spring.

[0017] After optional further training, it may be expedient to provide that the holding device and / or the support device has at least one adjusting device by means of which the alignment of the front panel can be advantageously adjusted.

[0018] In a preferred embodiment, the lifting element may be provided with a height adjustment mechanism, whereby the support surface of the lifting element remains supported on the wing during a height adjustment. Alternatively or additionally, a lateral adjustment mechanism may also be provided.

[0019] For static reasons, it is advantageous if the at least one support surface is optionally designed to be essentially plate-shaped and / or if the at least one support surface in the first position runs essentially parallel to the at least one load-bearing surface.

[0020] Assembly is further simplified if at least one support surface optionally has an insertion ramp and / or if a ramp or a groove with a slope is arranged on the support rib of the holding device or on the receiving channel or on the support surface.

[0021] Preferably, the front panel is pivotable for easy assembly or disassembly, particularly when moving the mounting device from the locked first position to the pre-locked second position, with the support surface forming a pivot bearing with the bearing surface.

[0022] Preferably, the support surface can be formed at a vertically lower end of the support device. This allows the weight of the front panel to be transferred particularly favorably, at least partially or completely, from the support surface to the load-bearing surface and from the load-bearing surface to the extension guide.

[0023] The holding means may also include a solvent by means of which the gripping means is adjustable, so that the locking section can be moved in the direction of the second position when the assembly device is moved into the pre-locked second position.

[0024] Preferably, the side frame may have additional functional channels, one of which may be a bottom channel for receiving a lateral edge area of ​​the floor. The receiving channel for the drawer slide may be separated from the bottom channel by at least one wall section, and the floor and the drawer slide may be arranged side by side with respect to the Z-direction, at least in the area of ​​the receiving channel. Depending on the design of the side frame, "side by side" is to be understood spatially, so that a bottom channel may also be arranged side by side above or below the receiving channel or the drawer slide.

[0025] The present invention is explained in more detail below with reference to several drawings. These show: Fig. 1 a perspective exploded view of a front panel adapter; Fig. 2a-d various other views of the front panel adapter from Fig. 1; Fig. 3 of a side view of a front panel adapter according to the type of Fig. 1 and Fig. 2, which furthermore has a device for lateral adjustment; Fig. 4, Fig. 5 views of two successive states during the assembly of a front panel with a front panel adapter with a holding element on a support element of a side frame of a drawer; Fig. 6 a perspective view of a drawer; Fig. 7 A perspective view of a side panel for a drawer in the style of Fig. 6; Fig. 8 a front view of a side frame with a drawer slide; and Fig. 9. A view of some functional elements of an assembly device.

[0026] Fig. Figure 6 shows a drawer 10 designed for insertion into and removal from a furniture carcass not shown here.

[0027] The drawer 10 has a base 11, a first side frame 12, a second side frame 12, a front panel 13 and a back panel 14.

[0028] A coordinate system X, Y, Z serves as a guide. The drawer 10 extends in the X direction. The base 11 is oriented in the X / Y plane, the side panels 12 are parallel to each other and parallel to the X / Z plane, and the front panel 13 and back panel 14 are parallel to the Y / Z plane. The usual operating position is one in which the base 11 is essentially horizontal and the drawer can also be pulled out of the cabinet in an essentially horizontal position.

[0029] In Fig. 7 and Fig. 8 shows one of the two side frames 12 of the drawer 10, which are aligned parallel to each other.

[0030] The side frames 12 each have a side wall assembly 120 in their upper Z-direction, comprising an inner wall 121 and an outer wall 122. The inner wall 121 and the outer wall 122 can be connected to each other in an upper area, for example, via a connecting web 123. The side wall assembly 120 can, for example, be formed from a sheet metal blank using a forming process. Alternatively, the side wall assembly can also consist of individual wall elements that are connected to each other, for example, by riveting, bonding, welding, or other joining methods.

[0031] It may optionally have one or more additional functional areas, which are not described in detail here. Essentially, the inner wall 121, the outer wall 122, and the connecting web 123 form a hollow chamber frame. Further functional elements may be located within the hollow chamber frame.

[0032] The side frames 12 can be essentially identical in construction. They can also be designed and aligned in a mirror-symmetrical manner with respect to a central X / Z plane of the drawer 10. In their lower area, the side frames 12 each have a channel arrangement 124, which can be formed from a bottom channel crossbar and which can have one or more functional channels.

[0033] Here, two of the functional channels are shown as examples on the floor channel traverse 124.

[0034] One of the functional channels can be designed as a bottom channel 1241 for receiving a lateral edge area of ​​the bottom 11. This bottom channel 1241 can (depending on the side of the drawer) be open towards the bottom 11, in the Y direction, or in the -Y direction.

[0035] The other of the functional channels of the channel arrangement 124 can further be configured as at least one receiving channel 1242 for receiving at least a partial extension guide 201.

[0036] The channel arrangement 124 can also be formed, for example, from a sheet metal blank using a forming process. It can optionally have one or more additional functional areas, which are not described in detail here. The channel arrangement can be located in the lower areas of the side wall arrangement and connect the inner wall 121 and the outer wall 122 as a kind of connecting plate.

[0037] The extendability or sliding capability of the drawer is ensured on each side frame 12 by one of the drawer guides 201 (see Fig. 8) This drawer slide 201 has, in addition to a rolling element arrangement, at least two or more rails movable relative to each other. These rails can, for example, comprise a cabinet rail 202, a drawer slide 203, and a center rail arrangement 204.

[0038] In Fig. Figure 8 shows how the extension guide 201 can be inserted from bottom to top into the downwardly open receiving channel 1242.

[0039] More precisely, the drawer slide 203 can be inserted into the receiving channel 1242 from below and secured there. The receiving channel 1242 has at least one substantially horizontal upper wall section 12421 oriented parallel to the top surface of the drawer slide 203 of the extension guide 201, as well as one or, in this case, two substantially vertical wall sections 12422 and 12423 arranged perpendicular to it. The drawer slide 203 can, in particular, abut and / or be secured to the horizontal upper wall section 12421.

[0040] A mounting device 3 is used to mount the front panel 13 to the side frame 12 (see in particular also Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5 and Fig. 9) with several functional units. These functional units comprise a holding element 31 and a lifting element 32 designed to interact with the holding element 31.

[0041] The retaining element 31 is provided on the side of the side frame 12.

[0042] It can be inserted and mounted in an area of ​​the side frame 12 facing the front panel 13 in a receiving space 125 between the side wall arrangement 120 and the channel arrangement 124 (see the receiving space 125 in Fig. 7 and Fig. 8, the holding element 31 (see also Fig. 7 and Fig. 9) the mounting device 3 is not shown here).

[0043] The support element 32, on the other hand, can be mounted on the front panel 13 on its surface facing the side frame (see Fig. 4 and Fig. 5) It may have a multi-part housing 323. This may be made of metal sheets. The support element 32 can also be referred to synonymously as a front panel adapter.

[0044] The retaining element 31 can include a support bracket 310. This bracket can be fixed in the receiving space 125 on the side frame 12. In particular, the support bracket 310 can be fixed to the upper horizontal wall section 12421 of the channel assembly 124. The support bracket 310 can be designed as a metal element. The support bracket 310 can have a lower horizontal bearing surface 3101, which can rest flat on the upper horizontal wall section 12421 of the floor channel cross member 124 and be attached there. A receiving surface 3102 can then be connected vertically to the bearing surface. Functional elements of the retaining element 31 can be formed on this receiving surface.

[0045] A movable, in particular pivotable, gripping device 311 can be arranged on the support console 310 ( Fig. 4, Fig. 5 and Fig. 9) The gripping means 311 can preferably be designed essentially as a lever pivotably mounted about an axis and / or in a guide. Alternatively, the gripping means can preferably be designed essentially as a linearly guided lever, which is not shown here. The gripping means 311 can be subjected to force by means of a force storage device designed as a spring 312 and brought into a tensioned position.

[0046] The gripping means 311 can fix the support means 32. This fixing can be achieved by gripping a locking section 324 arranged on the support means 32, specifically in a first position P1 in which the holding means 31 and the support means 32 are fixed or locked to each other (locking position P1, see Figure 1). Fig. 9). The locking section 324 can be a short bolt or pin (see Fig. 1 and Fig. 9) of the support means 32, which can be gripped by a one-sided open cam receptacle 3111 of the gripping means 311 (see Fig. 9).

[0047] The locking section 324 – here the bolt or pin – can further engage in a guide 31021 of the vertical wall section of the holding element, which is horizontally oriented here and preferably open on one side towards the front panel 13. This guide 31021 serves to secure the holding of the front panel 13 with the support element 32 in a kind of pre-assembly position even before the gripping element 311 is locked in the locking position P1 of the holding element 1 on the side frame. This pre-assembly position P2 is in Fig. Figure 5 shows that the gripping device 311 has not yet been moved into its locking position and the locking section 324 has not yet been locked. The front panel 13 has not yet been moved completely against the side frame in the -X direction. Nevertheless, the locking section 324 already engages in the guide 31021, which acts as a support cam.

[0048] The locking section 324 can be arranged in the housing 323 of the support means 32.

[0049] The support element 32 may preferably have a support surface 321 in its lower region, which is designed to support the front panel 13 and the retaining element 32 in both the locked position P1 and the pre-assembly position P2, also in the vertically lower region, on a support surface 313 of the side frame 12. For the pre-locking position, this is Fig. 5 is visible. In the locked position of the Fig. 9 would be the front panel 13 in the Fig. 5 shifted slightly further to the right in the direction of -X, and the support surface would lie more extensively on the wing than in Fig. 5.

[0050] This support surface 321 can be used in one in the Fig. 4 and Fig. 5 or, in a normal operating position, 1 lower area of ​​the housing 323 of the support element 32. It can be essentially horizontally oriented in the mounted position.

[0051] The support surface 321 rests wholly or partially, either directly or via a support element, on a load-bearing surface 313 of the side frame. In particular, it rests on the upper horizontal wall section 12421 or rests there via the support element, which in turn may rest on the upper horizontal wall section 12421. This support element can, in particular, be the horizontal support web 3101, which rests on and may be attached to the upper horizontal wall section 12421 of the receiving channel 1242. In the area of ​​the load-bearing surface 313, a material thickening can be created by means of the support element and the wall section 12421, which leads to a higher load-bearing capacity of the load-bearing surface 313. Thus, in the illustrated embodiment, the load-bearing surface 313 is formed by a surface area of ​​the upper horizontal wall section 12421 of the receiving channel 1242, on which the support surface 321 rests wholly or partially.

[0052] Since the drawer guide runs under the horizontal wall section 12421 and can rest against it, the weight of the front panel 13 can be excellently supported via the channel arrangement 124 on the drawer guide 201, and in particular on the drawer rail 203 which may be in contact with the wall section 12421.

[0053] The support surface 321 can be designed such that it rests entirely or partially on a support surface 313 in the locking position P1 and in the pre-assembly position P2, or directly on a support surface 313 via a support element 3103 for thickening the support surface 313 of the receiving channel 1242.

[0054] The support surface 321 preferably includes an insertion ramp 3211 formed here in the direction of the holding means 11 ( Fig. 1).

[0055] Due to this very good support of the weight forces of the front panel, the front panel 13 can be relatively large and, in particular, also tall (in the Z direction). Thus, the vertical height of the front panel 13 in the Z direction can be 150 mm or more.

[0056] The housing 323 of the support device or front panel adapter 32 - see for example Fig. 1, Fig. 2 and Fig. 3) can be made from one or more metal sheet blanks, which are preferably arranged around a base element 320, in particular arranged to be height-adjustable relative to the base element 320. The base element 320 can, for example, be made of plastic. The base element 320 can be fixed to the front panel 13.

[0057] An adjusting device 322 can also be arranged in the housing 323 of the support element 32. This device allows the vertical alignment of the front panel 13 at the end of the respective side frame 12 to be adjusted. The adjustment affects the position of the base element 320 relative to the housing 323, which is vertically supported on the side frame. The adjusting device 322 can be designed as an eccentric wheel whose eccentric circumferential surface is rotatable in a receptacle 3202 of the base element 320. The eccentric wheel is rotatably but vertically fixed on the housing 323 in such a way that the vertical position of the base element 320 relative to the housing 323, which is positioned vertically at a fixed height, can be adjusted by rotating the wheel. Additionally, small bolts 326, which are anchored in the housing 323 and extend through elongated holes 3201 of the base element 320, provide vertical guidance during height adjustment.

[0058] The base element 320 comprises at least one fastening element 3221 by means of which it can be fixed to the front panel 13. The fastening element 3221 can comprise at least one dowel section 32212 and at least one screw 32211 for fixing the front panel 13, which together form at least one dowel connection and can be designed to engage in corresponding blind holes in the front panel 13 (not shown here).

[0059] In Fig. 1 The support surface 321 is optionally shown as part of the housing 323 of the support means 12.

[0060] The support element 32 preferably comprises several vertically stacked fastening elements 3221. The fastening elements 3221 are preferably designed as several vertically stacked dowel connectors. Four of these dowel connectors are provided here because the front panel can be relatively high.

[0061] The vertical height of the front panel 13 in the direction of Z can be 150 mm or more.

[0062] Alternatively, fasteners other than dowel connections can be used (screws only or other fixings).

[0063] Fig. Figure 1 shows an exploded view of the support element 32. The support element 32 preferably comprises two housing parts: a first housing part 3231 and a second housing part 3232 corresponding to the first housing part 3231, on which the support surface 321 is formed. Alternatively, the housing parts 3231 and 3232 can also be combined into one part. This then forms the housing 323 with the locking section 324. The housing parts can be attached laterally to the base element and held together by the bolts 326.

[0064] Fig. Figure 4 shows a side view of the side frame 12 and the front panel 13 with the mounting device 3 with the holding means 31 and the support means 32. In this figure, the front panel 13 is not yet mounted on the side frame 12 shown here.

[0065] Fig. Figure 5, however, shows a side view of the side frame 12 and the front panel 13 with the mounting device 3 with the holding means 31 and the support means 32 in a pre-assembly position, in which the front panel 13 is already essentially supported in a pre-assembly position P2 on the side frame 12 shown here in a horizontal position, but is not yet fully assembled.

[0066] In addition, there are also those in Fig. 9. Recognizable final assembly position P1, in which the front panel 13 is captive and firmly locked to the side frame 12 by the spring force of the spring 312. In this final assembly position P1, the gripping element 311 engages the locking section 324 arranged on the support element 32 in the first position, supported by the force of the spring 312, to hold the assembly device 1 in an assembled state, so that the holding element 31 and the support element 32 are locked together. The gripping element 311 is adjustable against the force of the spring 312 by means of a release element 314, here optionally designed as a tool engagement, so that the locking section 324 in the gripping element 311, which is pivoted back against the spring force of the spring 312, is displaceable in the X-direction towards the pre-assembled second position P2 of the assembly device, which here corresponds to the position of the Fig. 5 corresponds to.

[0067] A gravitational force acting on the front panel 13 acts on the support element 32 in the end-locking position, but also in the pre-locking position of Fig. 5, and thus on the support surface 321, which rests on the support surface 313. As a result, the force, which is in particular a weight force G of the front panel 4, can be transferred at least partially from the support surface 321 to the support surface 313 and from there to the respective extension guide on the drawer 10.

[0068] Fig. Figure 5 shows a view of the assembly device 3 in the pre-locked second position, into which the support element 32 can be moved, and in which the holding element 31 and the support element 32 can be separated from each other or locked together. The support element 32 can be moved, in particular slid, both from the first position P1 to the second position P2 and vice versa, from the second position P2 to the first position P1. In the illustrated second position P2 of the assembly device 1, the front panel 13, which can be fixed to the support element 32, is already somewhat removed from the side frame 3, i.e., from the gripping element 311.

[0069] In this process, the gripping means 311, which is reset in particular by means of the spring 112, engages in the second position of the Fig. 5 of the mounting device 3 no longer engages the locking section 324, so that the support element 32 can be removed from the holding element 31.

[0070] In a particularly simple embodiment of the support element 32, it is possible, according to the invention, to implement the support element 32 without the adjusting device 322. Other embodiments of the gripping element 311 are also possible. Furthermore, lateral adjustment of the front panel 13 can also be provided. The lateral adjustment can be carried out on the support element 32 by means of an adjusting element 3222. Alternatively, it is also possible to arrange the lateral adjustment on the holding element 31.

[0071] In the exemplary embodiments, the locking section 324 of the support element 32 is formed by a bolt. Alternatively, the locking section 324 can be formed in various ways known in the prior art, e.g., by a contour of the support element.

[0072] In the exemplary embodiment, the housing 323 of the support element 32 is formed from two sheet metal parts that are joined together. Alternatively, it is possible to form the housing of the support element 32 in one piece, e.g., using a plastic part, a zinc die-cast part, or other alternatives known in the prior art. The entire base body of the support element can also be formed in one piece.

[0073] In this embodiment, the fastening means 3221 of the support element 32 are formed by a dowel-screw arrangement. Alternatively, the support element 32 can also be screwed directly without dowels, whereby other fastening systems such as drive-in dowels, drive pins, nail dowels, or quick-release systems are also possible. With a quick-release system, no tools are required for mounting the support element. Reference sign 10 drawers 11 Floor 12 side frames 120 side wall arrangement 121 Interior wall 122 Exterior wall 123 Connecting bridge 124 Channel Arrangement 1241 Floor channel 1242 Recording channel 12421, 12422, 12423 wall sections 125 Recording room 13 Front panel 14 Back panel 201 Extraction guide 202 Cabinet rail 203 drawer slide 204 Center rail arrangement 3 Mounting device 31 Holding devices 310 Support console 3101 Support bridge 3102 Access bridge 31021 Guided Tour 3103 Support element 311 Gripping devices 3111 Scenery shot 312 spring 313 Wing 314 Solvents 32 lifting devices 320 basic element 3201 elongated holes 3202 recording 321 Support surface 3211 Lead-in chamfer 322 Actuating device 3221 Fasteners 32211 screw 32212 Dowel section 3222 Adjustment element 323 Housing 3231 first housing part 3232 second housing part 324 Locking section 326 bolts G Weight force P1 first position P2 second position X, Y, Z coordinate system