Seat, in particular high chair for children

Abstract

The invention relates to a child high chair (10) having a height-adjustable support device (12, 13, 14) for supporting a child's body part, comprising a height adjustment device having a locking device (20) which locks a set height at least partially, in particular mainly by force locking.

Description

[0001] This application is a divisional application of the invention patent application with the application date of August 6, 2018, the application number of 201880064448.6, the international application number of PCT / EP2018 / 071245, and the invention title of "Seating furniture, in particular a high chair for children". Technical Field

[0002] The present invention relates to a seating furniture, in particular a high chair for children, as claimed in claim 1. Background Art

[0003] High chairs for children (child chairs) have long been known and have different designs. Generally, such a high chair includes a frame having a pair of front chair legs and a pair of rear chair legs (or as an alternative, for example, only two chair legs that are correspondingly widened at their lower ends to ensure stable standing) and a seat with a seat surface and a backrest. As additional elements, armrests, footrests, a storage shelf ("tray"), etc. may be provided. The frame (with or without a seat surface) can be folded as needed to enable a use position and a (more compact) folded position.

[0004] The seat can be in a fixed position relative to the frame or can also be adjusted in height, where the entire seat can be adjusted, or individual components such as the seat surface and / or the backrest and / or the footrest (which can be adjusted independently of each other if necessary) can be adjusted. It is also common in the prior art that (in a height-adjustable high chair) a certain number of predetermined positions (height positions) can be achieved for the adjustable components, for example, by constructing holes at suitable locations on the frame and providing (retractable) pins on the components to be adjusted.

[0005] For example, an adjustable child seat is known from DE 69009806 T2. According to DE 69009806 T2, two pins (one on each side of the child chair) are provided for height adjustment, which can occupy different discrete positions in a guide rail, so that the high chair can be adjusted according to the height. In principle, similar solutions are known from US 5238292A and US4722570A. In US 5238292 A, such locking pin elements are provided, which can engage with corresponding ribs, so that the height can also be adjusted. US 4722570 A describes hook elements that can cooperate with locking elements, also for discrete height adjustment. In general, these solutions are considered relatively complex in construction and operation and especially relatively inflexible in the prior art. Summary of the Invention

[0006] It is therefore an object of the present invention to provide a seat, in particular a children's chair, preferably a children's high chair, which has an adjustable support device for supporting a child's body part, and in which height adjustment should be achieved in a simple and particularly flexible manner.

[0007] This object is solved by a seat according to claim 1, in particular a children's high chair.

[0008] In particular, this object is achieved by a seat, in particular a children's chair, preferably a children's high chair, which has a height-adjustable support device for supporting a child's body part and / or an external object, such as a beverage bottle or a toy, and the height adjustment device has a locking device which locks the set height at least partially, in particular mainly by form-fitting (in particular by press fit and / or clamping).

[0009] According to another alternative independent aspect (but in particular can be combined with the above-mentioned aspect related to form-fitting), the above object is in particular solved by a seat, in particular a children's chair, preferably a children's high chair (which has a height-adjustable support device for supporting a child's body part), and the seat includes a height adjustment device for stepless height adjustment of the support device.

[0010] The core idea of the present invention is to lock a specific height (of the height-adjustable support device) at least partially (in particular mainly) by form-fitting (or friction locking). In form-fitting, there is a normal force on the surfaces to be locked to each other. The locking can only be overcome when the applied force exceeds the reaction force caused by static friction. Different from form-fitting, in positive locking, at least two parts to be connected are engaged with each other. Therefore, in positive locking, the parts to be connected cannot be separated from each other even without force transmission or when force transmission is interrupted. In other words, in a positively locked connection, one of the parts to be connected blocks the other part. Under operating loads, the pressure is normal to, i.e., perpendicular to, the surface of the parts to be connected. This type of positive locking is described, for example, in US4722570 A, US 5238292 A, and DE 69009806 T2.

[0011] It is not necessary to maintain the locking only through the provided force locking (but it is preferably set like this). However, in any case, the locking device is constructed such that the locking can only be maintained (under load) when the force locking also acts. In other words, the locking is only maintained when the force locking acts, or when at least if the force locking is released (or at least if the holding force of the force locking is not considered), the locking is not maintained. This should at least apply to such a state of the corresponding support device in which the self-weight of the support device acts. If the support device is a seat surface (or a footrest) and / or includes a seat surface (or a footrest), an additional load of preferably at least 5 kg, more preferably at least 10 kg (as the weight of a child) can also be considered here.

[0012] The upper limit of the weight (simulating a child) to be added to the support device can be ≤ 60 kg, preferably ≤ 40 kg. Therefore, for example, the locking should be caused at least together by the force locking within the range of 5 kg to 60 kg (in the sense that at least in a section of this range, the locking cannot be maintained without the force locking). The force that can preferably be compensated by the force locking (in the locked state) is ≥ 50 N, more preferably ≥ 200 N, and further preferably ≥ 300 N. The locking should be mainly caused by the force locking, especially when at least 50%, preferably at least 80% of the holding force is applied (especially in the above cases related to the additional weight of a child sitting on a chair, for example). If all forces can be compensated by the force locking, the locking is especially completely caused by the force locking (or the locking can be maintained by the force locking).

[0013] The height adjustment device is preferably constructed such that it can be adjusted within a height difference (along the vertical direction) of at least 5 cm, preferably at least 10 cm, and more preferably at least 15 cm. If any height value can be set within this height difference (or at least height values with a spacing ≤ 2 mm, especially ≤ 0.5 mm between each other), the height adjustment is preferably stepless. In principle, a first height adjustment range that can be adjusted steplessly and a second height adjustment range that can be adjusted discretely can also be set. However, in one embodiment, stepless height adjustment can be achieved over the entire height adjustment range (of the corresponding support device). If in addition to the steplessly adjustable height range, there is also a height range that can only be adjusted discretely, the height difference of the steplessly adjustable height range (in the vertical direction) is especially at least 2 cm, further preferably at least 5 cm, and even further preferably at least 10 cm.

[0014] In this embodiment, the locking device can be configured such that it locks the set height at least partially, in particular mainly by press - fitting and / or clamping. The term "press - fitting" can in particular be understood as a configuration in which a force (e.g., by a spring) acts in the direction of one or more attachment surfaces such that the mutually attached surfaces are pressed against each other. For example, a protrusion or a pin (or the like) can be pressed into a corresponding recess here. The term "clamping" (or the corresponding clamping device) should in particular be understood as a device that acts such that an increase in the applied force (e.g., when a child climbs onto the seat, in particular a high - chair) causes an increase in force based on force - locking (friction) (equivalent to a wedge jammed under a door gap). By this measure, reliable application can be achieved in a simple manner.

[0015] The support device can include a seat surface and / or a backrest and / or a footrest and / or armrests and / or a storage board (for water cups and the like).

[0016] The locking device can include (at least) one locking groove and at least one locking pin element that can be moved into and out of the locking groove. The locking pin element is preferably fixed in the locking groove in the locked state by press - fitting and / or clamping. By this configuration, stepless adjustment of the locking can be achieved in a simple manner. The locking groove can be provided on the main body (such as a frame) of the seat, in particular a high - chair, and the (at least one) locking pin element can be provided on the support device, and vice versa. The principle of interchangeability of the settings of components that can be connected by force - locking also applies in principle to other possible embodiments of the present invention (e.g., as explained below).

[0017] The locking can preferably be generated or released by rotation of the locking pin element and / or by translational movement of the locking pin element. For example, the locking pin element can be rotated into the locking groove to cause locking. Thus, locking can be achieved in a simple manner.

[0018] Preferably, the operating element is pre - stressed especially in the direction towards the locked position (or in the direction of pressing the operating element into the locked position by a pre - tensioning force). This further simplifies the operation.

[0019] In one embodiment, the locking can be generated and / or released by rotation of the operating element and / or by translational movement of the operating element. In particular, the operating element can be understood as an operating device (such as including a handle) that can be accessed from the outside so that the user can grasp it (in order to release or generate locking). Such an operating device can be provided, for example, in the middle area of the seat, in particular a high - chair. If necessary, at least two or more locking devices can be operated by one and the same operating element (or operating device) (so as to release or generate locking). The operating element and the locking pin element can be operatively connected to each other by a connecting device (which can be translational or purely translational if necessary).

[0020] In a specific embodiment, the operating element is rotatable and arranged such that it drives a (translatable) connecting device which in turn rotates one (or more) locking pin elements to produce or release a lock. With this configuration, the release or production of the lock can be achieved in a simple manner.

[0021] In a preferred embodiment, a preloading device, in particular a spring device, is provided which preferably acts in the direction of the locked state. As an alternative, a spring device (optionally another spring device) can also be provided which acts in the direction of the unlocked state. If a preloading device, in particular a spring device, acting in the direction of the locked state is provided, the lock can be produced and maintained in a simple (and reliable) manner. In particular, due to this preloading device, in particular a spring device, there is a predefined force independent of the specific use case (such as the weight of a child).

[0022] The height adjustment is preferably force-guided. This simplifies the operation. Such force guidance can include, for example, rails and / or grooves and / or chutes.

[0023] In a specific embodiment, a guiding groove for guiding the height adjustment is provided. This guiding groove is preferably at least partially formed by the above-mentioned locking groove (and vice versa). In particular, the guiding and / or locking grooves are configured such that the above-mentioned locking pin element can slide in the guiding or locking groove in the unlocked state.

[0024] As an alternative or in addition, an (additional) sliding element can be provided which can slide in the guiding or locking groove (for guiding or controlling the height adjustment). The sliding element is in particular provided in addition to the locking pin element. The sliding element can be configured as a plate (i.e., a slide plate), which can be concave (in particular a cylindrical circumferential section) and can move in the groove accordingly. In particular, in the locked position (optionally also in the unlocked position), the locking pin element preferably passes through the sliding element (in particular an opening in the sliding element, which can be configured, for example, in a slot shape). Overall, this simplifies the operation.

[0025] Generally, if a locking pin element that can be moved into and out of the locking groove is provided, this does not necessarily mean that the locking pin element must be able to be completely removed from the locking groove (but it can be so if necessary), but only in the sense that the locking pin element can be at least partially removed from the locking groove (in particular in the sense that the distal end of the locking pin element can be further away from the bottom of the groove).

[0026] Simple adjustment and locking can be achieved in an embodiment with a simple structure through a combined guiding and locking groove.

[0027] The locking device can be set up and constructed in such a way that the gravity (of the support device itself and, if necessary, of a child located on the support device) at least assists in the locking. The gravity can for example be directed (deflected) in such a way that it causes an increase in the normal force of surfaces that are in static friction with one another.

[0028] In one embodiment, the locking device has two locking pin elements (preferably rotatable in opposite directions). These two locking pin elements can, if necessary, be inserted into the same notch (such as a groove). These two rotatable locking pin elements are preferably forced to be guided in such a way (for example by a common abutment surface on the proximal ends of the locking pin elements) that they can only rotate together. Preferably, these two locking pin elements are supported on a common axis.

[0029] Generally, one or more locking pin elements can be supported on a rotational axis that is fixed in position relative to the seat, in particular the body (such as a frame) of a high chair. If there are two (in particular rotatable in opposite directions) locking pin elements, it can in particular be provided that the first locking pin element (at least mainly) enables the locking of downward movement and the second locking pin element (at least mainly) enables the locking of upward movement. In addition, there is the possibility that another force (for example based on spreading apart) can be generated by the rotation of the respective locking pin elements (for example by the rotation of the respective locking pin elements towards one another), which in turn improves the locking.

[0030] The one or more locking pin elements can be constructed in a wedge shape in cross-section (in particular in a radial cross-section) or, if necessary, in a flat shape.

[0031] Multiple locking devices, preferably two locking devices, in particular one locking device on each side of the seat, in particular a high chair, can be provided for each support device. This enables reliable locking.

[0032] In a preferred embodiment, the height adjustment and / or the locking of the set height and / or the unlocking of the set height can be carried out with one hand. Preferably, not only the height adjustment but also the locking of the set height and the unlocking of the set height can be carried out by grasping and operating a single handle. For example, the height adjustment (usually, if necessary, by a translational movement) can be carried out by lifting or lowering the handle (or allowing the handle to lower) and the locking of the set height or the unlocking of the set height can be achieved by rotating the handle. Such a handle is preferably constructed as one-piece or integral. In addition, the handle can be centered. In addition, the handle can have a concave outer surface (for gripping). The size (length) of the handle can be at least 5 cm, preferably at least 10 cm, and / or at most 30 cm, preferably at most 20 cm. Overall, the operation of the child seat is greatly simplified.

[0033] At least one or more locking pin elements preferably rotate downward (at least in the locked state, and if necessary in all possible states). This means that, for example, a dynamic load (Auflast) acting on the axis about which the respective locking pin element rotates causes further stretching (pivoting upward) of the locking pin element, so that the locking pin element in principle pivots further outward and thus the adhesion force (frictional force) increases. Thus, the action of the dynamic load can be used in a simple manner to increase the locking force.

[0034] According to the invention, there is provided a seating furniture, in particular a high chair, having a height-adjustable component, wherein the height adjustment locking (fixing) is preferably achievable by a clamping device (clamping element). The (in particular wedge-acting) clamping device can be arranged and configured on the body (such as a frame) of the seating furniture, in particular a high chair, so as to engage with the height-adjustable component, and vice versa. Thus, the locking device (clamping device) can enter a locked position in which relative movement between the body of the seating furniture, in particular a high chair, and the height-adjustable component is prevented, or enter a released state in which such relative movement can be carried out. The transition between the locked state and the released state is preferably achieved by rotation, but can also be carried out translationally. Preferably, the clamping device or the locking pin element is preloaded, for example by a spring or other (suitable preloading device), in the direction towards the locked state.

[0035] In a preferred embodiment of the invention, the relative movement between the body of the seating furniture, in particular a high chair, and the height-adjustable component is guided such that the relative movement follows (or must follow) a predetermined trajectory. Continuous (stepless) positioning can be carried out along this trajectory. As a guiding device, grooves can be provided on the element (body or height-adjustable component) that does not include a spring element (or clamping device). In the locked state, the locking pin element (or clamping device) can engage with the inner surface of the groove. Preferably, in the released state, the locking pin element (or clamping device) can move in the groove without being locked.

[0036] In a preferred embodiment of the invention, the transition of the locking pin element (or clamping device) from the released state to the locked state is preferably achievable by rotation. The rotation preferably occurs in such a way (or in such a direction of rotation) that the force in the direction of gravity (or along the guiding device, such as a guiding groove) at least partially (if necessary completely) causes engagement (locking). Alternatively or additionally, if necessary, two locking pin elements (clamping devices) can be provided, which can rotate in different directions if necessary, such that for each force (having a component in a possible direction of movement), at least one of the locking pin elements (or clamping devices) causes locking.

[0037] Generally, a seating furniture, in particular a high chair or a height - adjustable component, can be equipped with two or more locking pin elements (clamping devices or locking devices) or corresponding pairs of locking pin elements (or clamping devices), which can be released and / or brought into a locked state by a common mechanism.

[0038] Other embodiments of the invention are given in the dependent claims.

[0039] A seating furniture, in particular a high chair, can include a frame which, if necessary, has a pair of front chair legs and a pair of rear chair legs (or, as an alternative, for example, only has three or two chair legs which are, if necessary, widened at their lower ends to ensure a stable stand) and a seat with a seat surface and an optional backrest. As additional elements, armrests, footrests and / or a storage shelf ("tray") can be provided. The frame (with or without a seat surface) can be foldable if necessary to enable a use position and a (more compact) folded position.

[0040] The invention includes not only height adjustment (even though the invention is particularly advantageous for height adjustment because it is especially important here to be able to position a child or other object as precisely as possible), but also generally includes adjustment of other positions of the support device, in particular depth adjustment (i.e., in particular further forward or backward adjustment of the support device). In this regard, all "height adjustments" in the foregoing and the following can be replaced by "height and / or depth adjustment", where the orientation of the corresponding adjustment possibilities is not important (or at least not decisive). In addition, the expressions "upward" or "downward" can be replaced by "forward" or "backward".

[0041] In summary, contrary to the prior art, not only discrete (predetermined) positions of height adjustment can be achieved, but also stepless adjustment can be carried out. Thereby, the costs of materials and production can also be reduced because it is not necessary (as in the prior art) to provide separate elements, such as locking notches, etc. for each predetermined position. Generally, a height adjustment device can be achieved which allows stepless height adjustment of an adjustable component and can also reliably hold a specific adjustment position while having a relatively low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The invention will be explained in detail below with reference to the drawings by way of examples. The drawings are as follows:

[0043] Figure 1 A schematic front view of a high chair according to the invention, with a partially transparently shown surface;

[0044] Figure 2 Shows according to Figure 1 a separate element of the high chair;

[0045] Figure 3 Shows a separate element of the high chair according to Figure 1 in an oblique view;

[0046] Figure 4 The individual elements of a high chair according to the invention are shown in a side view and a first position;

[0047] Figure 5 Shown in a side view and a second position according to Figure 4 of the element;

[0048] Figure 6 In accordance with Figure 5 the position and an oblique view of the elements shown in accordance with Figure 4 and 5 of the element; and

[0049] Figure 7 Shown according to Figures 4 to 6 the individual elements of the high chair. Detailed Description

[0050] In the following description, the same reference numerals are used for components that are the same and have the same function.

[0051] Figure 1 A high chair 10 is shown including legs 11, a seat surface 12, a backrest 13, a footrest 14, and a storage board (tray) 15.

[0052] The seat surface 12 and the footrest 14 can be adjusted (independently of each other) in their height relative to the legs 11. The height adjustment mechanisms for the seat surface 12 and the footrest 14 are similar, so only the height adjustment mechanism for the seat surface 12 will be described in detail below.

[0053] The seat surface 12 generally includes a (symmetric) locking device 20. The locking device 20 has an operating device (lever) 21 and a stabilizing strut or housing 27. On each side of the locking device, there is also provided a force transmission device (rod) 23, a spring 24, a abutting element 28 that can be configured as a pressure plate (at the end of the force transmission device 23), and two locking pin elements 25 or clamping devices 25 (see Figure 2 and 3 ).

[0054] The spring tensions the locking pin elements 25 against each other in the locked state, and the locking pin elements 25 engage with a (matching) leg 11 of the high chair 10, specifically with a groove 29 provided there. When the locking device 20 is in the locked state, the operating device 21 can be configured (at least substantially) parallel to the housing 27 and can form a flush surface with the housing if necessary.

[0055] The operating device 21 has a (circular) central section 22 and (in the present case two) notches 22a, each of which engages with one of the force transmission devices 23 (rods) in the locked state. The respective locking pin elements 25 (on each side) are pivotally supported on the housing 27 about a common axis 26.

[0056] By rotating the operating device 21 to move the force transmission device 23 outwards (since the force transmission device 23 can no longer engage with the notch 22a), the locking device can be switched from the locked state to the released state. Thereby, the abutment device (pressure plate) 28 provided at the distal end of the respective force transmission device 23 also moves outwards and presses against the proximal end of the locking pin element 25. Due to this movement, the locking pin element 25 pivots about its (common) axis 26 against the tension force of the spring 24 and thus separates from the leg 11.

[0057] By rotating the operating device 21 (back to its original position), the spring 24 can pivot the locking pin elements 25 back so that they lock with the leg 11 again, because in this state the force transmission device 23 engages with the notch 22a again. Thereby, in the presence of an upward or downward acting force, one of the locking pin elements (clamping device) 25 can engage in a clamping manner with the respective groove 29, thereby preventing the seat surface 12 from moving in the direction of the force.

[0058] Figure 4 A side view of the individual elements of a high chair according to the invention is shown. The high chair can be constructed according to Figures 1 to 3 so that Figure 4 can also be regarded as an illustration of more details of a high chair according to Figures 1 to 3 . However, the slide plate 30 is not shown in Figures 1 to 3 . The slide plate 30 can optionally be provided (or not) in an embodiment according to Figures 1 to 3 . Instead, the slide plate 30 is shown in Figures 4 to 7 . However, in particular, the slide plate is only optional in an embodiment according to Figures 4 to 7 .

[0059] In Figures 4 to 6 it can be seen that by rotating the operating device 21, the locking pin element 25 is pushed into (see Figure 4 ) the groove 29 or removed from (more precisely, by pivoting, see Figure 5 and 6 ) the groove. The position according to Figure 4 corresponds to the position according to Figure 2 .

[0060] Furthermore, in Figures 4 to 7 the already mentioned plate 30 can be seen. The plate 30 (also see Figure 7 ) has a slot 31, and the sliding element 25 (see Figure 4)( ) can pass through the slot 31. When the operating device 21 moves, the plate 30 also moves together (upward or downward), so that the height adjustment can be reliably guided by the plate 30. The plate 30 thus moves together in the groove 29 (when the operating device moves upward or downward). According to this embodiment, a locking is generated between the locking pin element 25 and the groove 29. The plate 30 especially has a strengthening or stabilizing effect and improves the guidance in the groove. The plate preferably has no (or at most an insignificant) influence on the locking (but this can also be different in a potential alternative embodiment).

[0061] It should be noted here that all the above components, individually or in any combination, especially the details shown in the drawings, are considered to be important for the present invention and are claimed. Those skilled in the art are familiar with their variations.

[0062] List of reference numerals

[0063] 10 High chair

[0064] 11 Legs

[0065] 12 Seat surface

[0066] 13 Backrest

[0067] 14 Footrest

[0068] 15 Shelf

[0069] 20 Locking device

[0070] 21 Operating device

[0071] 22 Central section

[0072] 22a Notch

[0073] 23 Force transmission device (rod)

[0074] 24 Spring

[0075] 25 Locking pin element

[0076] 26 Axis

[0077] 27 Housing

[0078] 28 Abutting device

[0079] 29 Groove

[0080] 30 Slide plate

[0081] 31 Slot

Claims

1. A seating furniture, in particular a children's high chair (10), having a height-adjustable support device (12, 13, 14) for supporting a body part of a child and / or an external object, such as a beverage bottle or a toy, the seating furniture comprising a height adjustment device having a locking device (20), the locking device locking a set height at least partially, in particular mainly by form-fitting.

2. A seating furniture, in particular a children's high chair (10), having a height-adjustable support device (12, 13, 14) for supporting a body part of a child, preferably the seating furniture according to claim 1, the seating furniture comprising a height adjustment device for stepless height adjustment of the support device (12, 13, 14).

3. The seat, in particular a children's high chair (10) according to claim 1 or 2, characterized in that, The locking device (20) is configured such that the locking device locks the set height at least partially, in particular mainly by press fit and / or clamping.

4. A seat, in particular a children's high chair (10), according to any one of the preceding claims, characterized in that The support device includes a seat surface (12) and / or a footrest (14).

5. A seat, in particular a children's high chair (10), according to any one of the preceding claims, characterized in that, The locking device (20) includes a locking groove (29) and at least one locking pin element (25) that can be moved into and out of the locking groove (29), the locking pin element being preferably fixed in the locking groove (29) by press fit and / or clamping in the locked state.

6. The seat, in particular a children's high chair (10), according to any one of the preceding claims, characterized in that, Locking can be generated and / or released by rotation of the locking pin element (25) and / or by translational movement of the locking pin element (25).

7. A seat, in particular a children's high chair (10), according to any one of the preceding claims, characterized in that Locking can be generated and / or released by rotation of an operating element (21) and / or by translational movement of the operating element (21), the operating element being pre-tensioned, in particular pre-tensioned in the direction towards the locking position.

8. A seat furniture, in particular a children's high chair (10), according to any one of the preceding claims, characterized in that A pre-tensioning device, in particular a spring device (24), is provided, which acts in the direction towards the locked state.

9. A seat, in particular a children's high chair (10), according to any one of the preceding claims, characterized in that The height adjustment is force-guided.

10. A seat furniture, in particular a child's high chair (10), according to any one of the preceding claims, characterized in that, A guide groove (29) for guiding the height adjustment is provided, which is preferably at least partially formed by the locking groove according to claim 5, or vice versa, in particular such that the locking pin element (25) can slide in the guide or locking groove (29) in the unlocked state and / or such that an additional sliding element, preferably a slide plate, can slide in the guide or locking groove (29).

11. A seat, in particular a children's high chair (10), according to any one of the preceding claims, characterized in that, The locking device (20) is arranged and configured such that gravity at least assists in locking.

12. A seat, in particular a children's high chair (10), according to any one of the preceding claims, characterized in that, The locking device (20) has two locking pin elements, preferably locking pin elements (25) that can rotate in opposite directions.

13. A seat, in particular a children's high chair (10), according to any one of the preceding claims, characterized in that, A plurality of locking devices (20) are provided for each support device, preferably two locking devices for each support device, in particular one locking device is provided on each side for each support device.

14. A seat, in particular a children's high chair (10), according to any one of the preceding claims, characterized in that The height adjustment and / or the locking of the set height and / or the unlocking of the set height can be performed with one hand.

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