CN114258274A

CN114258274A - System for fixing a furniture leg to a piece of furniture and method for fixing a furniture leg to a piece of furniture

Info

Publication number: CN114258274A
Application number: CN201980099551.9A
Authority: CN
Inventors: 安德烈亚斯·农嫩马赫; 迈克·科德
Original assignee: Keith Holding Co
Current assignee: Keith Holding Co
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2022-03-29
Anticipated expiration: 2039-08-21
Also published as: EP3972448B1; US20220273095A1; CN114258274B; WO2021032299A1; EP3972448A1

Abstract

A system (3) for fixing a furniture leg to a piece of furniture comprises a fixing element (4) and a retaining element (5). The holding element (5) comprises a first and a second protrusion on one side. The fixing element (4) comprises: a first side (S1), a second side (S2) adjacent to the first side (S1), and a third side (S3) opposite the first side (S1), a recess (6) opening toward the first side (S1), a preload face (7) starting from the second side (S2) and extending along the third side (S3), and a stop face (8) adjacent to the preload face (7) and protruding from the third side (S3). The retaining element (5) and the fixing element (4) are configured such that the system (3) can fix the furniture leg to the furniture without play in a state in which the first projection is in contact with the recess (6) and the second projection is in contact with the pretensioning surface (7) without play.

Description

System for fixing a furniture leg to a piece of furniture and method for fixing a furniture leg to a piece of furniture

The present invention relates to a system and a method for fixing a furniture leg to a piece of furniture, in particular to a system and a method for fixing a furniture leg to a piece of furniture, such a system and a method for fixing a furniture leg to a piece of furniture

Typically, furniture includes a plurality of components. For example, a table is composed of a frame element, a table top secured to one side of the frame element, and table legs or furniture legs secured to the other side of the frame element.

If a customer purchases such a piece of furniture, the piece of furniture must be shipped to the customer by the manufacturer, distributor, or retailer. In order to save transport space, the furniture is transported in its disassembled state. For example, at the end customer, a single furniture leg must be mounted to the furniture.

In the prior art, designs are known in which a furniture leg can be fixed to a piece of furniture without the aid of tools, for example by means of a locking device. However, a disadvantage of this design according to the prior art is that the furniture legs attached to the furniture in this way are not attached without play. This results in vibration sensitivity of the furniture.

However, according to the requirements and tests of office furniture of the german DIN association (german standardization association, registration association) — german office desk and office cabinet safety requirement guidelines (see DIN technical report 147, 6 months 2006, point 3.6), it is necessary to ensure the prevention of vibrations by the design of office desks. Here, a specific test by means of a pendulum is foreseen. The designs according to the prior art, which envisage fixing furniture legs to furniture without the aid of tools, do not generally meet the DIN association standards with respect to freedom from vibrations.

Such a base fixing system is known from the prior art document DE102005037394a1, in which a locking mechanism for locking a table leg to a table in a tool-free manner is disclosed. In the disclosed design, the table leg is inserted obliquely into a recess of the table and is activated by a locking element by tilting (or erecting) the table leg. With such a design, a play-free securing of the table leg in the recess will normally not be achieved unless the parts to be interlocked, i.e. the recess and the headpiece, are dimensioned to be a press fit, which will be complicated and extremely expensive to produce. Furthermore, assembly requires a very high effort, since for a press-fit the parts have to be pressed in with a great force to achieve a secure fixing.

The object of the present invention is therefore to provide a system for fastening a furniture leg to a piece of furniture, by means of which the furniture leg can be fastened to the piece of furniture quickly, simply, economically and without play, and furthermore without the aid of tools.

This object is achieved by a system according to claim 1 and a method according to claim 12. Advantageous further developments of the invention are contained in the dependent claims.

According to one aspect of the invention, a system for securing a furniture leg to a piece of furniture comprises: a securing element configured to be securable to a furniture leg, and a retaining element configured to be securable to a furniture. On one side, the retaining element includes a first protrusion and a second protrusion spaced apart from the first protrusion. The fixation element has a first side, a second side adjacent to the first side, and a third side opposite the first side. Further, the fixing member has: a recess open towards the first side and configured to receive the first protrusion, a pretensioning surface extending from the second side along the third side, and a stop surface protruding from the third side and abutting the pretensioning surface.

The retaining element with the first projection and the second projection and the fastening element with the recess, the pretensioning surface and the stop surface are configured such that: the system secures the furniture leg to the furniture without play in a state where the first projection is at a predetermined depth on the first side and simultaneously contacts the recess without play on both sides thereof, and the second projection contacts the pretensioning surface and the stop surface without play.

By means of this configuration of the system, the furniture leg can be mounted on the piece of furniture in a simple and economical manner, simply and without play.

In an advantageous further development of the system, the first and second projections are formed by a first and a second shaft, respectively, projecting from the holding element.

The axle can be simply and economically purchased or manufactured and stored, thereby supporting economical production.

According to a more advantageous further development of the system, the first shaft and the second shaft are arranged in a protruding manner between opposite sides of the holding element, and the fixing element comprises: two recesses each configured to receive a first shaft, and two preload surfaces and two stop surfaces each in contact with a second shaft.

By providing the first and second axes on opposite sides, wherein the opposite sides may be turned away from or facing each other, the stability of the system is increased and the position of the furniture leg relative to the furniture can be easily determined.

In a further advantageous development of the system, the retaining element comprises an aperture for accommodating the shaft, and at least one of the apertures has a cross section which is configured such that it is possible for one of the first shaft and the second shaft to be inserted into the at least one aperture in a force-free manner, and such that in a state in which the first shaft is at a predetermined depth on the first side and is in contact with the recess without play on both sides thereof, while the second shaft is in contact with the stop face and is in contact with the pretensioning face without play, at least one of the first shaft and the second shaft has two contact points with at least one of the apertures.

Thus, the shaft can be mounted to the holding element simply and quickly by allowing force-free insertion, such as a cross section of a free cross section larger than the diameter of the shaft. In the case of a position in which the first projection is in contact with the recess at a predetermined depth on the first side and at the same time on both sides without play, and the second projection is in contact with the preloading surface and at the same time with the stop surface without play, a absolutely play-free and statically defined fixing is thus possible by the two contact points of the mounting position.

In an advantageous further development of the system, the at least one aperture comprises an egg-shaped cross section.

The egg-shaped cross section for realizing or providing the two contact points can be manufactured in a simple and economical manner.

In a further advantageous further development of the system, the fastening element is configured such that the distance between the central axis of the first shaft and the pretensioning surface is not constant along the course of the pretensioning surface from the second side towards the stop surface, wherein the first shaft is in contact with the recess at the predetermined depth at both sides thereof without play.

The non-constant distance facilitates a zero clearance of the system in the position in which the second shaft is in contact with the stop surface and the pretensioning surface is in contact with the stop surface without clearance, or, in this position, by adjusting the distance in advance accordingly, it is possible to easily generate the pretensioning force between the projection, the recess and the pretensioning surface in a desired manner.

In a further advantageous further development of the system, the pretensioning surface comprises: a first region, wherein, starting from the second side, the distance increases along the first region; and a second region contiguous with the first region, wherein the distance decreases or remains constant from the first region along the second region.

By providing these two regions, the behavior of the fixing element with respect to the retaining element can be influenced during assembly. As the distance increases in the first region, either a zero clearance is gradually created or a preload force is applied in a controlled manner as the shaft moves along the preload surface. In the second region, zero clearance or pretension can be easily maintained, since there is no component force that would cause the connection to be released.

Furthermore, the fitting operator may tactilely detect the transition from the first area to the second area, so that the fitting operator may tactilely detect the arrival of the final position.

In a further advantageous development of the system, the recess comprises a dimension in a direction along the second side, which decreases from the first side towards the third side.

Such a shape of the recess can be easily manufactured, and at a position where the first shaft is at a predetermined depth on the first side while being in contact with the recess without a gap on both sides thereof, it can be easily determined by adjusting the diameter of the shaft.

According to another advantageous further development of the system, the system comprises a locking device. The locking device fixes the fixing element relative to the retaining element in a state in which the first projection is in contact with the recess at a predetermined depth on the first side and at both sides thereof without a gap, while the second projection is in contact with the stop surface and with the pretensioning surface without a gap.

By means of the locking device, the position of the second projection in contact with the stop surface can be fixed, so that the play-free connection between the retaining element and the fixing element cannot be released, for example also when lifting the table in the table top position.

In a more advantageous further development of the system, the locking device is attached to the holding element and comprises: a rod movable relative to the retaining element; and a pretensioner element configured to push the lever in a locking direction into a locking position, wherein in the locking position, the locking device locks a position where the second protrusion is in contact with the stop surface.

In an advantageous further development of such a system, the locking device is arranged on the holding element and is configured such that the locking direction is parallel to the projection direction of the first and second projections.

By this arrangement, the locking can be released again in an ergonomic manner afterwards.

According to another aspect of the invention, a method for securing a furniture leg to a piece of furniture comprises the steps of:

inserting the first projection of the holding element into the recess of the fixing element which is open towards the first side;

rotation is carried out between the fixing element and the holder, the second projection of the holder being moved along the pretensioning surface such that the first projection is in contact with the recess at a predetermined depth and on both sides thereof without play, and the second projection is in contact with the stop surface and with the pretensioning surface without play.

In this way, the furniture leg can be mounted in a simple and cost-effective manner in a simple and play-free manner.

According to an advantageous further development of the method, the position of the second projection in contact with the stop surface is locked.

Thereby, the position of the second projection in contact with the stop surface can be fixed, so that the connection between the holding element and the fixing element cannot be released, for example also when lifting the table by means of the table top.

In an advantageous further development of the method, the second projection is first moved in a first region of the pretensioning surface in which the distance between the central axis MA of the first shaft, which at the same time is in contact with the recess on both sides without play, and the pretensioning surface increases along the course of the pretensioning surface in the direction of the second side to the stop surface at the predetermined depth. Thereby exerting a pretension or creating zero clearance between the protrusion, recess and pretensioning surface. The second projection is then moved in a second region of the pretensioning surface, wherein the distance is reduced or kept constant in order to automatically maintain the position of the second projection in contact with the stop surface.

By these features of the method, the behaviour of the fixation element with respect to the retaining element can be influenced during assembly. As the distance increases in the first region, either a zero clearance is gradually created or a preload force is applied in a controlled manner as the shaft moves along the preload surface. In the second region, zero clearance or pretension can be easily maintained, since there is no component force that would cause the connection to be released.

In a further advantageous development of the method, the transition between the first and second region of the pretensioning surface can be detected in a tactile manner.

By the transition, the arrival of the final assembly position, i.e. the position in which the second projection is in contact with the stop face and a play-free connection is established, can be reported to the assembly operator by a sensible or audible engagement.

The invention is elucidated below with reference to the accompanying drawings.

In particular, it is possible to use,

figure 1 illustrates a transverse cross-sectional view of a table with legs;

figure 2 illustrates a transverse cross-sectional view of the table shown in figure 1 with the legs in a fully installed condition;

FIG. 3 shows an enlarged detail view of detail A of FIG. 1;

FIG. 4 shows an enlarged detail view of detail B of FIG. 1; and

figure 5 shows a cross-sectional view of the front of the table of figure 1 with a locking device.

Figure 1 shows a transverse cross-section of a table 1, in which the table 1, as an embodiment of furniture, has table legs 2 mounted thereon, as an embodiment of furniture legs. The table 1 includes a system 3. the system 3 in turn includes a securing member 4 and a retaining member 5 to secure the table leg 2 to the table 1.

The securing member 4 is secured to the leg 2 and includes a first side S1, a second side S2 adjacent the first side S1 and a side S3 opposite the first side S1.

Furthermore, the fixing element 4 comprises a recess 6 which is open towards the first side S1. Starting from the second side S2, a pretensioning surface 7 is provided which extends along the third side S3. Furthermore, the securing element 4 is provided with a stop face 8 which adjoins the pretensioning face 7 and projects from the third side S3. In the present exemplary embodiment, the lower end of the preloading surface 7 and the stop surface 8 are arranged in a recess or depression of the fastening element 4. In an alternative embodiment, the invention is not provided. It is also possible to provide the pre-tightening surface 7 and the stop surface 8 on the open third side S3.

The fixing element 5 is fixed on the work table 1. In one aspect, the fixing element 5 comprises a first shaft 9 and a second shaft 10 spaced apart from the first shaft 9, the first shaft 9 and the second shaft 10 protruding from the side of the holding element 5. The first shaft 9 and the second shaft 10 are arranged in parallel. In an alternative embodiment, no shaft is provided, but a first suitable projection and a second suitable projection spaced apart therefrom. In a further alternative embodiment, the

shafts

9, 10 are not arranged in parallel, but they are arranged in another suitable attitude relative to each other, wherein pretension or zero clearance can be imposed on the system.

The recess 6 of the fixing element 4 is configured to receive a first shaft 9. The recess 6 comprises a dimension in the direction of the second side S2, which decreases from the first side S1 towards the third side S3. Alternatively, it is not essential that the dimension in the direction of the second side S2 be reduced the greater the depth of the recess 6. A constant dimension in the direction of the second side S2 is also possible if the dimension is coordinated with the diameter of the first shaft 9 so as to ensure that there is no clearance for accommodation.

In fig. 1, a state is shown in which the first shaft 9 is in contact with the recess 6 at a predetermined depth of the first side S1 and at both sides thereof without a gap, and the second shaft 10 is in contact with the stopper surface 8 and with the preload surface 7 without a gap. In this state, the holding member having the first projection and the second projection and the fixing member having the recess, the preload surface and the stopper surface are constructed so that the leg 2 can be fixed to the table 1 without a gap.

Figure 2 illustrates a transverse cross-sectional view of the table 1 of figure 1 with the legs 2 in a condition prior to full installation.

The first shaft 9 has been inserted from the first side S1 to a predetermined depth so that it is in contact with the recess 6 without gaps on both sides. The second shaft 10 is illustrated in a state in which it is moved along the preload face 7 to generate a preload between the first shaft 9 and the recess 6. Alternatively, a zero gap between them may be maintained or created.

Fig. 3 shows an enlarged detail view of detail a in fig. 1. The holding element 5 comprises an aperture 11 for receiving the first shaft 9. The aperture 11 comprises a cross-section configured to enable force-free insertion of the first shaft 9. Furthermore, the orifice 11 comprises a free cross-section larger than the diameter of the first shaft 9.

In the state shown in fig. 1, the first shaft 9 is in contact with the recess 6 at a predetermined depth from the first side S1 and without play on both sides, and the second shaft 10 is in contact with the pretensioning surface 7 and with the stop surface 8 without play, the first shaft 9 and the aperture 11 having two contact points K1, K2. The orifice 11 has an egg-shaped (oval) cross section configured to enable a free cross section and two contact points K1, K2. In an alternative embodiment, the orifice 11 does not have an egg-like shape but another suitable shape, such as an ellipse (ellipse).

At the same time, the first shaft 9 and the recess 6 must be in contact with the contact points K3, K4. Thereby, a gapless connection between the fixing element 4 and the holding element 5 at the first shaft 9 is ensured.

Fig. 4 shows an enlarged detail view of detail B in fig. 1. The holding element 4 comprises an aperture 12 for receiving the second shaft 10. The aperture 12 has a cross-section configured to be insertable in a force-free manner into the second shaft 10. Furthermore, the orifice 12 has a free cross-section greater than the diameter of the second shaft 10.

In the state shown in fig. 1, the first shaft is in contact with the recess at a predetermined depth of the first side S1 and at the same time in a gapless manner on both sides, and the second shaft 10 is in contact with the preload face 7 and with the stop face 8 in a gapless manner, the second shaft 10 and the orifice 12 having two contact points K5, K6. The orifice 12 has an egg-shaped cross section to achieve a free cross section and two contact points K5, K6. In an alternative embodiment, the aperture 12 does not have an egg-shape but another suitable shape, such as an ellipse.

In fig. 1, the distance D between the center axis MA of the first shaft 9 and the preload surface 7 is shown at a predetermined depth and at the same time in contact with the recess 6 without a gap on both sides. In fig. 4, the distance D is not constant along the course of the preload face 7 in the direction of the second side S2 to the stop face 8.

In particular, the pretensioning surface 7 comprises a first area 7a, D increasing from the second side in the direction of the first area 7a, in order to pretension the system, or alternatively to eliminate play from the system by movement of the second shaft 10 along the pretensioning surface 7. Furthermore, the pretensioning surface 7 comprises a second region 7b, the distance D decreasing from the first region 7a in the direction of the second region 7 b. In an alternative embodiment, the distance D in the second region 7b remains constant.

In an alternative embodiment, the distance between the central axis MA of the first shaft 9, which is at a predetermined depth and at the same time is in contact with the recess 6 without play on both sides, and the pretensioning surface 7 may be constant, wherein then a zero play may be ensured without pretensioning or further pretensioning of the system by movement of the second shaft 10 along the pretensioning surface 7.

Figure 5 is a front cross-sectional view of the table of figure 1 with a locking device 13.

In fig. 5, it is shown that the second shaft 10 is arranged in a protruding manner between opposite sides of the holding element 5. Although not shown, the first shaft 9 is also disposed in a protruding manner between the opposite sides of the holding member 5.

The fixing element 5 comprises two recesses 6, two pre-tightening surfaces 7 and two stop surfaces 8, which respectively receive a first shaft 9, with which the second shafts 10 then respectively come into contact.

In an alternative embodiment, the first shaft 9 and the second shaft 10 project outwardly from only one side of the holding element 5 or from both sides of the holding element 5, wherein then, as the case may be, only one recess 8, one pretensioning surface 7 and the stop surface 8, respectively, are provided.

The locking device 13 is attached to the holding element 5 and comprises a rod 14 which is movable relative to the fixing element 5. Furthermore, the locking device 13 comprises a pretension element 15 which pushes the lever 14 in the locking direction VR into a locking position in which the locking device 13 locks the position of the second shaft 10 in contact with the stop surface 8.

Thereby, the fixing element 4 is fixed to the holding element 5 under the fixing element 4 in a state where the first shaft 9 is in contact with the recess 6 at a predetermined depth of the first side S1 and at both sides thereof, and the second shaft 10 is in contact with the stopper surface 8 and in contact with the preload surface 7 without a gap.

The locking device 13 is arranged on the holding element 5 such that the locking direction VR is parallel to the protruding direction of the first and

second shafts

9, 10.

In an alternative embodiment, the locking device 13 may not be provided with a pretensioning element, but may be locked manually. Furthermore, the locking device 13 may not be attached to the holding element but to the fixation element, and in addition thereto it may comprise another locking device. It is important that the system is fixed in a state where the first shaft 9 is in contact with the recess 6 at a predetermined depth of the first side S1 and without a gap on both sides, and the second shaft 10 is in contact with the stop surface 8 and with the preload surface 7 without a gap.

In use, to secure the table leg 2, the first shaft 9 of the retaining member 5 is first inserted into the recess 6 of the securing member 4 which is open towards the first side S1. Thereby, the holding element 5 is moved such that the first shaft 9 is in contact with the recess 6 on both sides. It is thus ensured that the second shaft 10 is positioned such that it can move along the pretensioning surface 7 of the holding element 5 without colliding with the second side S2 of the holding element 5. On the other hand, if the first shaft 9 has not been inserted sufficiently into the recess 6, the second shaft 10 is located on the second side S2 and the holding element 5 can be moved relative to the fixing element 4 such that the second shaft 10 reaches the pretensioning surface 7.

Subsequently, a rotation between the fixing element 4 and the holding element 5 is carried out such that the second shaft 10 of the holding element 5 moves along the pretensioning surface 7 of the fixing element 4 until the first shaft 9 is at a predetermined depth in the recess 6, while at the same time the second shaft is in contact with the recess 6 on both sides without play, the second shaft is in contact with the stop surface 8 and with the pretensioning surface 7 without play. Depending on the installation posture of the table 1, the fixing member rotates with respect to the holding member 5, or the holding member 5 rotates with respect to the fixing member 4.

When rotation is performed between the fixing element 4 and the holding element 5 to a position where the second shaft 10 is in contact with the stop surface 8, the system 3 locks in an automatic manner if a locking device 13 with a pretensioning element 15 for automatic locking is provided.

During rotation, the second shaft 10 first moves in a first region 7a of the preload face 7, in which region the distance between the center axis MA of the first shaft 9, which is at a predetermined depth and at the same time is in contact with the recess 6 on both sides without play, and the preload face 7 increases along the course of the preload face 7 in the direction of the second side S2 to the stop face 8, so that a preload is generated between the

shafts

9, 10, the recess 6 and the preload face 7. Subsequently, the second shaft 10 is then moved into the second region 7b of the pretensioning surface 7, during which the distance D is reduced in order to maintain the position of the second shaft 10 in contact with the stop surface 8 in a positively driven manner. As a result, the transition between the first and second region is detected in a tactile manner without generating a pretensioning force, as the case may be.

All features of the description, the claims and the drawings may be relevant to the invention, individually or in any combination.

Claims

1. A system (3) for fixing a furniture leg to a piece of furniture, comprising:

a fixing element (4) configured to be fixable to a furniture leg, an

A holding element (5) configured to be fixed to the furniture,

wherein,

the retaining element (5) comprises a first projection on one side and a second projection spaced apart from the first projection;

the fixing element (4) comprises:

a first side (S1), a second side (S2) adjacent to the first side (S1), and a third side (S3) opposite to the first side (S1),

a recess (6) open towards the first side (S1) and configured to receive the first protrusion, and,

a pre-tightening face (7) extending from the second side (S2) along the third side (S3), and a stop face (8) projecting from the third side (S3) and abutting the pre-tightening face (7);

wherein the holding element (5) with the first and second projections and the fixing element (4) with the recess (6), the pretensioning surface (7) and the stop surface (8) are configured such that

The system (3) enables the furniture leg to be fixed to the piece of furniture without play, in a state in which the first projection is at a predetermined depth of the first side (S1) and at the same time is in contact with the recess (6) on both sides, and the second projection is in contact with the stop face (8) and with the pretensioning face (7) without play.

2. The system (3) according to claim 1,

the first projection is formed by a first shaft (9) and the second projection is formed by a second shaft (10), wherein the first shaft (9) and the second shaft (10) each project from the holding element (5).

3. The system (3) according to claim 2,

the first shaft (9) and the second shaft (10) are arranged in a protruding manner between opposite sides of the holding element (5) and,

the fixing element (4) comprises: two recesses (6) for receiving the first shafts (9), respectively, and two pre-tightening surfaces (7) and two stop surfaces (8), respectively, which are in contact with the second shafts (10).

4. The system (3) according to claim 2 or 3,

the holding element (5) comprises an aperture (11, 12) for accommodating the shaft (9, 10), and

at least one of the apertures (11, 12) has a cross-section configured such that it is possible for one of the first shaft (9) and the second shaft (10) to be inserted into the at least one aperture (11, 12) in a force-free manner, and such that: at least one of the first shaft (9) and the second shaft (10) has two contact points with at least one of the apertures (11, 12) in a state where the first shaft (9) is in contact with the recess (6) at a predetermined depth of the first side (S1) and on both sides thereof without a gap, and the second shaft (10) is in contact with the stopper surface (8) and with the preload surface (7) without a gap.

5. The system (3) of claim 4,

at least one orifice (11, 12) has an egg-shaped cross section.

6. System (3) according to one of claims 2 to 5,

the fixing element (4) is configured such that the distance (D) between the central axis MA of the first shaft (9) and the pre-tightening surface (7), which is at a predetermined depth and at the same time is in contact with the recess (6) on both sides without a gap, is not constant along the course of the pre-tightening surface (7) in the direction of the second side (S2) to the stop surface (8).

7. System (3) according to claim 6, wherein the pre-tightening plane (7) comprises:

a first region (7a), wherein, starting from the second side (S2), the distance (D) increases along the first region (7 a); and

a second region (7a) adjoining the first region (7a), wherein the distance (D) decreases or remains constant from the first region (7a) along the second region (7 a).

8. The system (3) according to any one of the preceding claims,

the recess (6) has a dimension in a direction towards the second side (S2), wherein the dimension decreases from the first side (S1) towards the third side (S3).

9. The system (3) according to any one of the preceding claims,

the system (3) comprises a locking device (13), said locking device (13) fixing the fixing element (4) to the retaining element (5) in a state in which the first shaft (9) is in contact with the recess (6) at a predetermined depth of the first side (S1) and at both sides thereof, while the second shaft (10) is in contact with the stop face (8) and with the preload face (7) in a play-free manner.

10. The system (3) according to claim 9,

the locking device (13) is attached to the holding element (5) and comprises:

a rod (14) movable with respect to the retaining element (5); and

a pretension element (15) configured to push the lever (14) in a locking direction (VR) into a locking position, wherein in the locking position the locking device (13) locks the position where the second protrusion is in contact with the stop surface (8).

11. The system (3) according to claim 10,

the locking device (13) is arranged on the holding element (5) and is configured such that the locking direction (VR) is parallel to a protruding direction of the first and second protrusions.

12. Method for fixing a furniture leg to a piece of furniture by means of a system (3) according to any one of the preceding claims, with the following steps:

inserting a first projection of the holding element (5) into a recess (6) of the fastening element (4) which is open to the first side (S1);

rotation is carried out between the fixing element (4) and the retaining element (5) such that the second projection of the retaining element (5) moves along the pre-tightening surface (7) of the fixing element (4) such that the first projection is in contact at a predetermined depth with both sides with the recess (6) without play, the second projection is in contact with the stop surface (8) and with the pre-tightening surface (7) without play.

13. The method of claim 12 with the additional step of:

locking the position of contact of the second projection with the stop surface (8).

14. The method of claim 12 or 13,

the second projection is first moved in a first region (7a) of the pre-tensioning surface (7), in which first region (7a) the distance (D) between the central axis MA of the first shaft (9) which is in contact with the recess (6) on both sides at the predetermined depth without play and the pre-tensioning surface (7) increases along the course of the pre-tensioning surface (7) in the direction of the second side (S2) to the stop surface (8), so that a pre-tensioning force is applied or a zero play is created between the projection, the recess (6) and the pre-tensioning surface (7), and

the second projection is then moved in a second region (7b) of the pretensioning surface (7), wherein the distance (D) is reduced or kept constant in order to automatically maintain the position of the second projection in contact with the stop surface (8).

15. The method of claim 14, wherein,

the transition between the first region (7a) and the second region (7b) of the pre-tightening face (7) can be detected tactilely.