Seating furniture

Abstract

Multi-part seating furniture with a base (12) and at least one superstructure (14), wherein the base (12) has a bottom (24), a circumferential wall (26), an upwardly open receiving space (28) and a standing surface (30) for resting on a substrate, wherein the standing surface (30) is formed on the bottom (24) and is in particular convex, wherein the circumferential wall (26) has an upper end face (32) which radially delimits an opening (34) into the receiving space (28), wherein the at least one superstructure (14) has a supporting surface (52) and a projection (60) at its lower end, wherein the projection (60) extends further downwards than the supporting surface (52) and is designed to be received into the receiving space (28) through the opening (34),and wherein the lowest of the at least one attachment (14) rests with its bearing surface (52) on the end face (32) of the base (12) and the projection (60) of the lowest of the at least one attachment (14) extends through the opening (34) into the receiving space (28).

Description

The invention relates to a piece of seating furniture and a base for such seating furniture. Seating that can be adjusted to the user's height is quite common. Usually, height adjustment mechanisms are used, some of which can be difficult to operate, especially if the seating is a tilting stool. The object of the invention is therefore to provide a piece of seating furniture and a base for a piece of seating furniture that allow for easy adjustment of the height of the seat surface of the seating furniture. The problem is solved by a multi-part seating element comprising a base and at least one upper section. The base has a bottom, a perimeter wall, an upwardly open receiving chamber, and a standing surface for resting on a surface. The standing surface is formed at the bottom and is, in particular, convex, with the perimeter wall having an upper end face that radially defines an opening into the receiving chamber. The at least one upper section has a bearing surface and a projection at its lower end, the projection extending downwards further than the bearing surface and designed to receive the seating element through the opening. The lowermost of the at least one upper section rests with its bearing surface on the end face of the base, and the projection of the lowermost of the at least one upper section extends through the opening into the receiving chamber. Due to the multi-part construction consisting of a base and one or more attachments that are stacked on top of each other to create the seating furniture, the user can use different attachments, making it easy to adjust the seat height. At least one of the attachments is designed differently from the base; in particular, at least one of the attachments has a lower height and / or a different weight than the base. The lowest of the at least one attachment is, for example, stacked on the base, particularly without any further fastening means. In particular, there is no central rod or element extending vertically through the base and one of the at least one attachment. The upward direction corresponds to the direction against gravity when the seating furniture is properly positioned. Directional and location terms such as "above" and "below" refer to the upward direction and the properly positioned state of the seating furniture. In particular, the projection that extends through the opening of the base prevents the attachment from slipping radially relative to the base. The opening can extend horizontally, i.e., have a normal in the vertical direction. For example, the contact surface of the attachment is directed downwards and / or lies in a horizontal plane. The end face can be an annular shape when viewed from above, and / or it can completely surround the opening, particularly when viewed from above. The annular shape can, for example, be circular or have another geometry. For example, it can be oval or polygonal, such as rectangular, hexagonal, or octagonal. The end face can be, for example, flat, stepped, crenellated or wavy along the circumferential direction in the vertical direction. The cross-section of the circumferential wall is, for example, ring-shaped and / or has the same geometry as the end face. For example, the perimeter wall radially limits the recording space. The recording chamber has a volume of at least 6 liters, for example. The volume may be between 6 liters and 8 liters, but is particularly close to 7 liters. It is conceivable that the seating furniture is rotationally symmetrical about the vertical direction, for example about any angle or about one or more specific angles. In one embodiment, the projection of at least one attachment has the same circumferential line as the opening, is completely closed in the circumferential direction and / or is completely closed at the bottom, in particular designed as a dome, which further improves the attachment to the base or improves the stability of the attachment. The opening can have a circumferential line or contour, and the projection can have a circumferential line complementary to the opening. For example, the projection is located radially inside the bearing surface and / or extends from the bearing surface, in particular from the radially inner edge of the bearing surface. This further reduces radial play. In one embodiment, the uppermost of the at least one attachment is a seat attachment, wherein the seat attachment has a seating surface at its upper end. A dedicated seat attachment can improve the seating comfort of the furniture. For example, the seat surface extends radially further than the support surface. The seat attachment is in particular made in one piece, has a height between 6 cm and 10 cm, in particular between 8 cm and 9 cm and / or a weight between 200 g and 300 g, in particular between 230 g and 270 g. For example, the seating furniture has exactly one seat attachment as at least one attachment, with the seat attachment stacked on the base. In one aspect, the seating furniture has a central axis, wherein the seating furniture, in particular the base, is designed such that the central axis of the seating furniture aligns itself in a vertical resting position under the influence of gravity if the central axis has been tilted to the vertical direction by a tilting angle, wherein the tilting angle is between 29° and 50°, in particular between 47° and 50°, or between 29° and 74°, in particular between 72° and 74°, if the seating furniture has exactly one base and exactly one seat attachment, in particular consisting of these. This enables ergonomic sitting without the seating furniture tipping over. In one embodiment, one of the at least one attachment is an intermediate attachment, wherein the intermediate attachment has a base and an upwardly open space, the base having an upper end face that radially defines an opening into the space, wherein a further attachment of the at least one rests with its bearing surface on the end face of the base, and the projection of the further attachment of the at least one attachment extends through the opening into the space. The shape of the intermediate attachments makes it possible to increase the height of the seating furniture particularly safely. In particular, the intermediate sections are identical and / or the intermediate section has a height between 8 cm and 16 cm, especially approximately 12 cm. It is also conceivable that intermediate sections with different heights are provided. The intermediate attachment, for example, weighs between 100 g and 250 g, particularly between 160 g and 190 g. In one embodiment, the seating furniture has a seat attachment and at least one intermediate attachment, wherein the at least one intermediate attachment is arranged between the base and the seat attachment, in particular wherein the seating furniture has several intermediate attachments, wherein a lowest of the intermediate attachments is stacked on the base and the seat attachment is stacked on a topmost of the intermediate attachments. For example, when using more than two intermediate attachments, the intermediate attachments – except for the lowest one – are stacked on top of the next lower intermediate attachment. In one embodiment, the seating furniture has a central axis, wherein the seating furniture, in particular the base, is designed such that the central axis of the seating furniture aligns itself into a vertical rest position under the influence of gravity if the central axis has been tilted to the vertical direction by a tilting angle, wherein: - if the seating furniture has exactly one base, exactly one seat attachment and exactly one intermediate attachment, in particular if the tilting angle is between 22° and 36°, in particular between 33° and 36°, or between 22° and 58°, in particular between 56° and 58°, - if the seating furniture has exactly one base, exactly one seat attachment and exactly two intermediate attachments, in particular if the tilting angle is between 16° and 26°, in particular between 23° and 26°, or between 16° and 46°, in particular between 44° and 46°, and / or - if the seating furniture has exactly one base, exactly one seat attachment and exactly three features intermediate attachmentsin particular consists of a tilt angle between 13° and 19°, in particular between 16° and 19°, or between 13° and 34°, in particular between 32° and 34°. This ensures safe ergonomic sitting with a tilted seat surface. In particular, the central axis in the vertical rest position has an angle of less than 5°, especially less than 2°, to the vertical direction. The tilt angles of the aforementioned ranges (e.g., 33° - 36°, 23° - 26°, 16° - 19°) are achieved in particular with a base that has a homogeneous density, especially one that is monolithic. The tilt angles of the latter areas (e.g., 56° - 58°, 44° - 46°, 32° - 34°) are achieved in particular with a base that has areas or sections with different densities. For improved stability, the gap at the bottom can be limited by the projection and / or the bearing surface can be located on a lower surface of the base. To ensure all connections are identical, the upper end face of the base and the opening of the intermediate section can be designed identically to the upper end face of the circumferential wall and the opening of the base. In one embodiment, the at least one attachment, in particular the seat attachment and / or the intermediate attachment, is made in one piece and / or from a solid material, in particular a plastic, especially expanded polypropylene (EPP) and / or expanded thermoplastic polyurethane (E-TPU). In this way, the attachments are particularly durable. For example, the first section and the second section are made of the same material or of different materials. For example, at least one essay consists exclusively of the respective material. To further improve the stability of the seating furniture, the base in the area of ​​the opening can have a smaller diameter than the largest diameter of the base and / or the radial thickness of the circumferential wall can increase towards the bottom. In the recording room, the user can place additional weights to adjust the seating to the desired height and further increase stability. These weights can be integrated into the seating itself. For particularly high stability, the base can have a center of gravity that is at or less than one-third of the height, especially at or less than one-quarter of the height of the base. For example, the center of gravity of the base is lower than the center of gravity of an equally tall tower made of stacked attachments. The height of the base corresponds, for example, to the vertical distance from the apex of the base to the highest point of the front surface. For example, the height of the base is greater than approximately 12 cm, and particularly greater than approximately 16 cm. For example, the height of the base is between 20 cm and 40 cm, and particularly between 25 cm and 35 cm. This base height makes it particularly easy to achieve a sufficiently high seat with a low center of gravity. In one design, the base is made in one piece, which further improves durability. Alternatively or additionally, the base has a first section and a second section, the first section being the bottom and the second section the perimeter wall. The first section is specifically manufactured separately from the second section. The first and second sections of the basis are different from the at least one essay. Therefore, the at least one essay does not constitute a section of the basis. For example, the second section is tubular and / or has a larger diameter at the bottom than at the top. In one embodiment, the first section and / or the second section is made of a solid material, in particular a plastic, in particular expanded polypropylene (EPP), resulting in a particularly lightweight but stable section. The first section and / or the second section can be made of expanded thermoplastic polyurethane (E-TPU), providing an elastic and robust section. The first section and / or the second section, for example, consist exclusively of this material. To specifically adjust the stability, the first section and the second section can have the same density or different densities, with the density of the first section being greater than the density of the second section, thereby achieving a particularly low center of gravity of the base. In the context of this revelation, the density of a section is understood to mean the density of the material of the respective section, independent of the spatial shape of the respective section. For example, the second section has a density between 25 g / l and 105 g / l, in particular between 55 g / l and 75 g / l, for example of about 65 g / l, and the first section has a density between 150 g / l and 250 g / l, in particular between 170 g / l and 230 g / l, for example of about 200 g / l. Densities between 25 g / l and 105 g / l can be achieved, for example, using EEP as the material. Densities between 150 g / l and 250 g / l can be achieved, for example, using E-TPU as the material. It is conceivable that the entire base, the first section and / or the second section have a density that is higher than the density of at least one essay. It is also conceivable that the first section and the second section both have a density, in particular the same density, between 25 g / l and 105 g / l, in particular between 55 g / l and 75 g / l, in particular of about 65 g / l. In one embodiment, the first section has a connection area at its upper end, and the second section has a connection area at its lower end, wherein the first section and the second section are positively and / or force-fitted to one another by means of the connection areas, in particular wherein the connection areas are designed with complementary geometries, for example steps, the steps resting on one another. In this way, a secure connection between the sections is provided. For example, one of the connection areas has an undercut in the vertical direction, and the other connection area has a radial projection that engages in the undercut, in particular wherein the undercut and the radial projection extend along at least 75% of the circumference of the base, and in particular completely along the circumference of the base. This achieves a secure connection in the vertical direction. To prevent the sections from twisting relative to each other, one of the connecting areas can have at least one radial nose and the other of the connecting areas can have at least one recess complementary to the nose, with the nose engaging in the recess. Multiple protrusions, for example three, can be provided, especially those evenly distributed around the circumference. For example, the number of indentations may be equal to the number of protrusions. Furthermore, the task is solved by a base for a multi-part seating furniture, in particular for a seating furniture as described above, with a floor, a perimeter wall, an upwardly open receiving space and a standing surface for resting on a substrate. The features and advantages described for the seating furniture apply equally to the base and vice versa. The base can have a first section and a second section, wherein the first section comprises the floor and the standing surface, and wherein the second section comprises the perimeter wall. In particular, the first section and the second section have the same density or different densities, with the density of the first section being greater than the density of the second section, and / or the base has, for example, a center of gravity located at or less than one third of the height, in particular at or less than one quarter of the height of the base. For example, the first section and / or the second section are made of a solid material, in particular a plastic, especially expanded polypropylene (EPP) and / or expanded thermoplastic polyurethane (E-TPU). Further features and advantages of the invention will become apparent from the following description and from the accompanying drawings, to which reference is made. The drawings show: Fig. 1 a perspective view of a seating furniture according to a first embodiment of the invention with a base according to a first embodiment of the invention, Fig. 2 the seating furniture according to Fig. 1 in an exploded sectional view, Fig. 3 the seating furniture according to Fig. 1 in the properly assembled state in a vertical rest position in section, Fig. 4 the first section of the base according to Fig. 1 in a top view, Fig. 5 the second section of the base according to Fig. 1 in a bottom view, Fig. 6 the seating furniture according to Fig. 1 in the properly assembled state in a tilted position in section, Fig. 7 a second embodiment of the seating furniture in an exploded sectional view, Fig. 8 a base of a third embodiment of the seating furniture in section, and Fig.9 the front face of a base of a fourth embodiment of the seating furniture in section. Fig. 1 shows a piece of seating furniture 10 in perspective view. In the illustrated embodiment, the seating element 10 is a tilting stool. The seating element 10 consists, for example, of several parts, so it is referred to as a multi-part seating element 10. The seating furniture 10 has a base 12 and at least one top 14. For example, as in the illustrated embodiment, the seating furniture 10 has three attachments 14, one of the attachments 14 being a seat attachment 16 and the other two attachments 14 being each an intermediate attachment 18. In the properly assembled state of the seating furniture 10, the attachments 14 are stacked on the base 12, with the intermediate attachments 18 being stacked on the base 12 first and the seat attachment 16 being stacked on the upper of the intermediate attachments 18. The seating furniture 10 has a vertical direction H that extends against gravity. A central axis M of the seating furniture 10 extends in the vertical direction H. For example, the seating furniture 10 is rotationally symmetric about the central axis M, for example about one or more specific angles as in the illustrated embodiment. However, rotational symmetry about arbitrary angles is conceivable. Directional and location references such as "above" and "below" refer to the properly assembled state of the seating furniture 10 in relation to the vertical direction H. Fig. 2 shows the seating furniture 10 in a cut view, wherein the base 12, the intermediate sections 18 and the seat top 16 are shown explosively spaced apart and stacked on top of each other. Fig. 3 shows the seating furniture 10 in section in its properly assembled state. The base 12 has a first section 20, a second section 22, a floor 24, a perimeter wall 26, a receiving space 28 and a standing surface 30. The floor 24 has a lower outer surface that represents the standing surface 30 of the seating furniture 10. The base 30, for example, is convex and has in particular a vertex which, in a top view of the base 12, lies at the centroid of the base 24. The base 30 serves to support the seating furniture 10 on a surface. When properly assembled and not in use, the seating furniture 10 rests on the ground with its base 30, in particular with the apex of the base 30. The vertex of the base 30 lies on the central axis M. The floor 24 has an upper outer surface that limits the recording space 28 downwards. For example, floor 24 is shaped like a trough. The floor 24 is completely sealed, so that the recording room 28 is also completely sealed at the bottom. The perimeter wall 26 connects to the floor 24 at the top. The circumferential wall 26, for example, is tubular and limits the receiving space 28 in a radial direction. The circumferential wall 26 is, for example, as in the illustrated embodiment, closed in the circumferential direction and thus completely encloses the receiving space 28. The circumferential wall 26, for example, has a ring-shaped cross-section, as shown in the embodiment, which can be circular. However, the ring-shaped cross-section can also have other geometries. For example, it can be oval or polygonal. A rectangular, hexagonal, or octagonal ring-shaped cross-section is also conceivable. For example, the circumferential wall 26 has a varying radial thickness that decreases upwards from the base 24. In this way, the center of gravity of the base 12 is shifted downwards. As can be seen in Fig. 2, the outer diameter can also decrease towards the top. At the same time, it is possible for the inner diameter of the circumferential wall 26, i.e., the diameter of the receiving chamber 28, to be constant, with the exception of a curved surface at the bottom 24. For example, the base 12 reaches its largest outer diameter at the bottom 24, which means that the center of gravity of the base 12 is low. At its upper end in the vertical direction H, i.e. at the upper axial end, the circumferential wall 26 has an end face 32. The end face 32 is an annular surface in plan view on the base 12, which in particular has the same geometry as the cross-section of the circumferential wall 26. Accordingly, the end face 32 is a ring-shaped surface, for example circular, as in the illustrated embodiment, or oval, rectangular, hexagonal or octagonal. The front surface 32 surrounds an opening 34 of the receiving space 28 in the circumferential direction. Recording room 28 is therefore open at the top. For example, the recording room is closed in every other direction. For example, the opening 34 extends horizontally, i.e. perpendicular to the vertical direction H, and it has a diameter d. According to the geometry of the front surface 32, the opening 34 has a circumferential line, for example in the form of a circle, an oval or a polygon. It is also conceivable that the front surface 32 has a different geometry on its inner side than on its outer side. In the vertical direction H, the end face 32 can be planar, i.e., completely span a plane which is in particular perpendicular to the vertical direction H. For example, as in the embodiment shown, the end face 32 is shaped in a wave-like manner along the circumferential direction in the vertical direction H, so that wave troughs exist which are lower than wave crests in the vertical direction H. The receiving chamber 28, for example, has a volume between 6 l and 8 l, in particular about 7 l, measured from the lowest point of the front surface 32, in the illustrated embodiment therefore from the wave troughs. As can be seen in Fig. 2, the base 12 consists of the first section 20 and the second section 22. The first section 20 forms at least the bottom 24, and the second section 22 forms the circumferential wall 26. Accordingly, the second section 22 is tubular and has a larger outer diameter at the lower end than at the upper end. However, it is also conceivable that the first section 20 extends further upwards and also forms parts of the circumferential wall 26. In Fig. 4 the first section 20 is shown in a top view, and in Fig. 5 the second section 22 of the base 12 is shown in a bottom view. From Figures 2, 3, 4 and 5 it can be clearly seen that both the first section 20 has a connection area 36 and the second section 22 has a connection area 38. The connection area 36 of the first section 20 is located at the upper end of the first section 20. For example, the connection area 36 has a step upwards from the radial outside to the inside. For example, the step has an undercut in the vertical direction H, so the upper shoulder of the step projects radially outwards. The step, and thus the undercut, extends over at least 75% of the perimeter of the first section 20, in particular along the entire perimeter. Complementary to the connection area 36 of the first section 20 is the connection area 38 of the second section 22. The connecting area 38 of the second section 22 is located at the lower end of the second section 22. The connecting area 38 of the second section 22 is a groove extending from the inside, opening downwards, and is designed to be complementary to the step of the connecting area 36 of the first section 20. Other complementary geometries are also conceivable. A projection 40 extends radially inwards into the groove. The groove and also the projection 40 of the connecting area 38 of the second section 22 extend along at least 75% of the circumference of the second section 22, in particular along the entire circumference. The connecting area 38 can be a stage complementary to the stage of the connecting area 36. As can be seen in Fig. 5, the connection area 36 of the first section 20 can also have lugs 42 extending radially outwards from the step. The lugs 42 can be provided at equal intervals around the circumference. Complementary to this, the connecting area 38 of the second section 22 has recesses 44 in the groove. The recesses 44 have a geometry and arrangement complementary to the lugs 42. It is also conceivable that the connecting area 38 of the second section 22 has the noses 42 and the connecting area 36 of the first section 20 has the recess 44. In the assembled state of the base 12, as shown in Figs. 2 and 3, the projection 40 of the second connection area 38 of the second section 22 engages in the undercut of the first connection area 36 of the first section 20. In this way, a positive fit in the vertical direction H is achieved between the first section 20 and the second section 22. At the same time, the lugs 42 of the connection area 36 of the first section 20 engage in the recesses 44 of the connection area 38 of the second section 22, thereby achieving a positive fit in the circumferential direction, so that the two sections 20, 22 cannot be twisted against each other. It is conceivable that, as an alternative to or in addition to the positive locking, a force locking connection is provided through the connection areas 36, 38. The base 12 assembled in this way has, for example, a height from the apex of the base 30 to the highest point of the end face 32 of between 20 cm and 40 cm, for example between 25 cm and 35 cm. In particular, the height of the base 12 is greater than about 12 cm, and in particular greater than about 16 cm. The first section 20 and the second section 22 are made of a solid material, in particular a plastic such as expanded polypropylene (EPP) or expanded thermoplastic polyurethane (E-TPU). For example, the first section 20 and the second section 22 are made of the same material or of different materials. In particular, the first section 20 and the second section 22 are one piece and consist exclusively of one material. Regardless of whether the first section 20 and the second section 22 are made of the same or different material, the first section 20 can have a higher density than the second section 22, as shown in the embodiment. For example, the second section 22 has a density between 25 g / l and 105 g / l, in particular between 55 g / l and 75 g / l, for example of about 65 g / l. The second section 22 can have a weight between 240 g and 290 g, in particular between 250 g and 270 g. The first section 20, for example, has a density between 150 g / l and 250 g / l, in particular between 170 g / l and 230 g / l, for example of about 200 g / l. The first section 20 can have a weight between 900 g and 1000 g, in particular between 940 g and 980 g. For example, the base 12 has a weight between 500 g and 1300 g. For example, the base 12 of the described embodiment with a first section 20 having a higher density than the second section 22 has a weight between 1100 g and 1400 g, in particular between 1150 g and 1300 g. However, it is also conceivable that the first section 20 and the second section 22 have the same density, for example between 25 g / l and 105 g / l, in particular between 55 g / l and 75 g / l, for example of about 65 g / l. The center of gravity of the base 12 has a height in the vertical direction H above the vertex of the base surface 30 of exactly or less than one third, in particular one quarter, of the height h of the base 12. The intermediate attachments 18 are identical in the illustrated embodiment, so only one of the intermediate attachments 18 will be described below as an example. The intermediate section 18 has a base 46 and a projection 48. The base 46, similar to the circumferential wall 26, is ring-shaped and surrounds a space 50 of the intermediate section 18 in the circumferential direction or limits the space 50 in the radial direction. The base 46 has a bearing surface 52 at its lower end, which is also designed in a ring shape. The contact surface 52 is therefore directed downwards. Furthermore, it is located in a horizontal plane. The bearing surface 52 has the same geometry in plan view as the end face 32 of the base 12, wherein the bearing surface 52 lies in a plane, but the end face 32 can be wavy. On its upper side, the base 46 has an end face 54 that surrounds an opening 56 of the space 50. The end face 54 has, for example, the same geometry as the end face 32 of the base 12, in the illustrated embodiment the same diameter d, and is wavy along its circumference. The projection 48 extends downwards from the base 46. In particular, the projection 48 abuts the radial inner edge of the bearing surface 52 directly on its inner side. For example, the projection 48 is completely closed circumferentially and downwards and, as in the illustrated embodiment, is designed as a dome. The dome shape becomes particularly visible when the intermediate attachment 18 is viewed upside down. The projection 48 has a thickness that is, for example, less than the thickness of the bottom 24 of the base 12. The projection 48 limits the space 50 downwards, so that the space 50 is only open upwards. The projection 48 has, particularly in the plane of the bearing surface 52, the same circumferential line as the opening 34 of the base 12 and also as the opening 56 of the intermediate attachment 18 itself. The diameter of the projection 48 also corresponds to the diameter d of the opening 34 or the opening 56. The intermediate attachment 18, for example, has a height between 8 cm and 16 cm, specifically around 12 cm. It is also conceivable that intermediate attachments 18 with different heights are available. The intermediate attachment 18, for example, has a weight between 100 g and 250 g, in particular between 160 g and 190 g. The seat attachment 16, for example, has a closed disc 58, as in the illustrated embodiment, from which a projection 60 extends downwards centrally. The projection 60 is identical in design to the projection 48 of the intermediate attachment 18 and in particular has the same circumferential line as the opening 34 of the base 12 or as the opening 56 of the intermediate attachments 18. In contrast to the projection 40 of the intermediate attachments 18, the projection 60 of the seat attachment 16 is not hollow, but made of solid material. Adjoining the projection 60 radially, the seat attachment 16 on the disc 58 has a bearing surface 62 that corresponds to the bearing surface 52 of the intermediate attachments 18. In particular, in plan view, it has the same geometry as the end face 32 of the base 12. It is also conceivable that the contact surface 62 of the seat attachment 16 is formed as recesses in the disc 58. In this case, the lower surface of the disc 58 protrudes relative to the recesses and thus the contact surface 62, so that the lower surface forms the projection 60 of the seat attachment 16, which extends into the opening 34, 56. The top of the disc 58 is designed as a seat surface 64. The seat surface 64 extends radially further than the support surface 62. For example, the seat surface 64 has a larger diameter than the largest diameter of the base 12. The seat attachment 16, for example, has a height between 6 cm and 10 cm, in particular between 8 cm and 9 cm and / or a weight between 200 g and 300 g, in particular between 230 g and 270 g. Both the seat attachment 16 and the intermediate attachments 18 are made in one piece and are made, for example, of a solid material, in particular a plastic, such as EPP or E-TPU. For example, the density of the seat attachment 16 and / or the intermediate attachments 18, i.e., of all attachments 14, corresponds to the density of the second section 22 of the base 12. However, it is also conceivable that the entire base 12 and / or the second section 22 have a density that is higher than the density of the attachments 14. To assemble the seating element 10 of the illustrated embodiment, one of the intermediate sections 18 is first stacked onto the base 12. The projection 48 of the intermediate section 18 is inserted through the opening 34 of the base 12 into the receiving space 28 until the bearing surface 52 of the intermediate section 18 rests on the end face 32 of the circumferential wall 26 of the base 12. The engagement of the projection 48 in the opening 34 prevents the intermediate section 18 from sliding radially relative to the base 12. The second intermediate attachment 18 is then inserted with its projection 48 into the opening 56 of the intermediate attachment 18 already stacked on the base 12. The contact surface 52 of the upper of the two intermediate attachments 18 then rests on the end face 54 of the lower of the two intermediate attachments 18. Here too, the projection 48, which now engages in the gap 50 of the intermediate attachment 18 below, prevents radial slippage. Subsequently, the projection 60 of the seat attachment 16 is inserted into the opening 56 of the upper of the two intermediate attachments 18, so that the contact surface 62 of the seat attachment 16 rests on the front surface 54 of the upper of the two intermediate attachments 18. The projection 60 of the seat attachment 16 thus engages in the space 50 of the intermediate attachment 18 and prevents the seat attachment 16 from slipping radially relative to the underlying attachments 14 or the base 12. In this way, the attachments 14 are easily stacked on the base 12 and are nevertheless secured against radial slippage. This eliminates the need for elements extending vertically H through the base 12 and, for example, through an attachment 14 within the receiving space 28. The opening 34 of the base 12 and the openings 56 of the intermediate attachments 18 are thus now closed by the projections 48 and 60 of the attachments 14 above them, respectively. No other elements are located in the openings 34 and 56. In particular, no central rod is provided that extends in the vertical direction H from the base 12 to the seat attachment 16. The convex base 30 allows the seat 10 to tilt, enabling particularly ergonomic seating positions. For example, the seat 10 is therefore a tilting stool. However, a flat base 30 is also conceivable, which could, for example, be ring-shaped. Fig. 6 shows the seating furniture in a tilted position. The vertical direction H of the seating furniture 10 and the vertical direction V relative to the ground no longer coincide, so that the central axis M and the vertical direction enclose a tilting angle α. For example, the seat surface 64 is also tilted by the tilt angle α, but relative to the horizontal direction. From this position, when the tilting force on the seat 10 is removed, the seat, due to its low center of gravity, moves back to its vertical rest position, as shown, for example, in Fig. 3, solely by the action of gravity. In the vertical rest position, the central axis has an angle of less than 5°, in particular less than 2°, to the vertical direction V. The low center of gravity of the seating furniture 10 is achieved by the fact that the base 12 has a very low center of gravity and / or is heavier and / or denser compared to the attachments 14. The tilt angle α from which the seating furniture 10 rights itself automatically depends on the position of the center of gravity of the seating furniture 10. In particular, the seating furniture 10 rights itself automatically from a tilt angle smaller than the tilt angle α. For example, the tilt angle α for the seating furniture 10 shown, when it consists only of the one base 12, the one seat attachment 16 and exactly two intermediate attachments 18, is between 16° and 46°, in particular between 44° and 46°. The first section 20 of the base 12 has, for example, a density between 170 g / l and 230 g / l, in particular of about 200 g / l, and the second section of the base has a density between 55 g / l and 75 g / l, in particular of about 65 g / l. Provided that the base 12 is made with a homogeneous density, for example between 55 g / l and 75 g / l, in particular of about 65 g / l, the tilt angle α is between 16° and 26°, in particular between 23° and 26°. Furthermore, the seat 10 can be easily adjusted to the weight of the user by placing weights, such as small bags (shown as dashed lines in Fig. 3), in the receiving space 28. This lowers the center of gravity of the entire seat 10, making it more stable. It is also conceivable that the first section 20 of the base 12 is exchanged for a first section 20 with higher or lower density in order to adapt the seating furniture 10 to the weight of the user. The height of the seat surface 64 can be adjusted just as easily as the seating unit 10 is assembled. To adjust the height, more or fewer intermediate sections 18 are simply inserted between the base 12 and the seat attachment 16. It is conceivable that only one intermediate attachment 18, three intermediate attachments 18, four intermediate attachments 18 or more than four intermediate attachments 18 are arranged between the base 12 and the seat attachment 16. If the seating furniture 10 has exactly three intermediate sections 18 instead of two intermediate sections 16, then the tilting angle α is between 13° and 19°, in particular between 16° and 19° (with a base 12 of homogeneous density) or between 13° and 34°, in particular between 32° and 34° (with a base 12 with a first and second section 20, 22 of different densities). If the seating furniture 10 has exactly one intermediate section 18 instead of two intermediate sections 16, then the tilting angle α is between 22° and 36°, in particular between 33° and 36° (with a base 12 of homogeneous density) or between 22° and 58°, in particular between 56° and 58° (with a base 12 with a first and second section 20, 22 of different densities). Fig. 7 shows the seating furniture 10 according to Fig. 2, in which no intermediate attachments 18 are provided, but only the seat attachment 16 is provided as attachment 14. The seat attachment 16 is then stacked directly on the base 12, and the projection 60 of the seat attachment 16 engages in the opening 34 of the base 12. The tilting angle α, from which the seating furniture 10 automatically rights itself, in this embodiment of the seating furniture 10 with exactly one base 12, exactly one seat attachment 16 and no intermediate attachment 16, is between 29° and 50°, in particular between 47° and 50° (with a base 12 of homogeneous density) or between 29° and 74°, in particular between 72° and 74° (with a base 12 with a first and second section 20, 22 of different densities). Figures 8 and 9 show further embodiments of the seating furniture 10 and the base 12 respectively, which essentially correspond to the first embodiment, so that in the following only the differences will be discussed and identical and functionally equivalent parts are provided with the same reference numerals. Figure 8 shows a third embodiment of the base 12. In this third embodiment, the base 12 is made in one piece. Fig. 9 shows the end face 32 of a base 12 according to a fourth embodiment. In this fourth embodiment, the end face 32 is formed with a crenellated shape along the circumferential direction. It is also conceivable that the end face 32 could be stepped in a different way along the circumferential direction. The described embodiments are merely examples. In particular, the various features of the embodiments can be combined with one another as desired. It is also conceivable that the diameter of the projections 48, 60 of the attachments 14 is larger than the diameter d of the openings 34, 56 of the base 12 or of the intermediate attachments 18, in order to also achieve a clamping effect of the projections 48, 60 in the openings 34, 56.

Claims

Multi-part seating furniture with a base (12) and at least one superstructure (14), wherein the base (12) has a bottom (24), a circumferential wall (26), an upwardly open receiving space (28) and a standing surface (30) for resting on a substrate, wherein the standing surface (30) is formed on the bottom (24) and is in particular convex, wherein the circumferential wall (26) has an upper end face (32) which radially delimits an opening (34) into the receiving space (28), wherein the at least one superstructure (14) has a supporting surface (52) and a projection (60) at its lower end, wherein the projection (60) extends further downwards than the supporting surface (52) and is designed to be received into the receiving space (28) through the opening (34),and wherein the lowest of the at least one attachment (14) rests with its bearing surface (52) on the end face (32) of the base (12) and the projection (60) of the lowest of the at least one attachment (14) extends through the opening (34) into the receiving space (28). Seating furniture according to claim 1, characterized in that the projection (48, 60) of the at least one attachment (14) has the same circumferential line as the opening (34) of the base (12), is completely closed in the circumferential direction and / or is completely closed downwards, in particular is designed as a dome. Seating furniture according to claim 2, characterized in that the projection (48, 60) is located radially inside the support surface (52) and / or extends from the support surface (52), in particular the radially inner edge of the support surface (52). Seating furniture according to one of the preceding claims, characterized in that the uppermost of the at least one attachment (14) is a seat attachment (16), wherein the seat attachment (16) has a seat surface (64) at its upper end. Seating furniture according to claim 4, characterized in that the seating furniture (10) has exactly one seat attachment (16) as the at least one attachment (14), wherein the seat attachment (16) is stacked on the base (12), in particular wherein the seating furniture (10) has a central axis (M), wherein the seating furniture (10), in particular the base (12), is designed such that the central axis (M) of the seating furniture (10) aligns itself into a vertical rest position under the influence of gravity when the central axis (M) has been tilted to the vertical direction (V) by a tilting angle (α), wherein the tilting angle (α) is between 29° and 50°, in particular between 47° and 50°, or between 29° and 74°, in particular between 72° and 74°, when the seating furniture (10) has exactly one base (12) and exactly one seat attachment (16), in particular consisting thereof. Seating furniture according to one of claims 1 to 4, characterized in that one of the at least one attachment (14) is an intermediate attachment (18), wherein the intermediate attachment (18) has a base (46) and an upwardly open space (50), wherein the base (46) has an upper end face (54) that radially limits an opening (56) into the space (50), wherein a further attachment (14) rests with its bearing surface (52) on the end face (54) of the base (46) and the projection (48, 60) of the further attachment (14) extends through the opening (56) into the space (50). Seating furniture according to claim 4 and claim 6, characterized in that the seating furniture (10) has a seat top (16) and at least one intermediate top (18), wherein the at least one intermediate top (18) is arranged between the base (12) and the seat top (16), in particular wherein the seating furniture (10) has several intermediate tops (18), wherein a lowest of the intermediate tops (18) is stacked on the base (12) and the seat top (16) is stacked on a topmost of the intermediate tops (18). Seating furniture according to claim 7, characterized in that the seating furniture (10) has a central axis (M), wherein the seating furniture (10), in particular the base (12), is designed such that the central axis (M) of the seating furniture (10) aligns itself into a vertical rest position under the influence of gravity when the central axis (M) has been tilted to the vertical direction (V) by a tilting angle (α), wherein: - if the seating furniture (10) has exactly one base (12), exactly one seat attachment (16) and exactly one intermediate attachment (18), in particular if the tilting angle (α) is between 22° and 36°, in particular between 33° and 36°, or between 22° and 58°, in particular between 56° and 58°, - if the seating furniture (10) has exactly one base (12), exactly one seat attachment (16) and exactly two intermediate attachments (18), in particular if the tilt angle (α) is between 16° and 26°, in particular between 23° and 26°, or between 16° and 46°, in particular between 44° and 46°,and / or if the seating furniture (10) has exactly one base (12), exactly one seat attachment (16) and exactly three intermediate attachments (18), in particular if the tilt angle (α) is between 13° and 19°, in particular between 16° and 19°, or between 13° and 34°, in particular between 32° and 34°. Seating furniture according to one of claims 6 to 8, characterized in that the space (50) is limited downwards by the projection (48) and / or that the support surface (52) is arranged on a lower surface of the base (46). Seating furniture according to one of claims 6 to 9, characterized in that the upper end face (54) of the base (46) and the opening (56) of the intermediate attachment (18) are identical to the upper end face (32) of the circumferential wall (26) and the opening (34) of the base (12). Seating furniture according to one of the preceding claims, characterized in that the at least one attachment (14), in particular the seat attachment (16) and / or the intermediate attachment (18), is made in one piece and / or is made of a solid material, in particular a plastic, in particular an expanded polypropylene (EPP) and / or an expanded thermoplastic polyurethane (E-TPU). Seating furniture according to one of the preceding claims, characterized in that the base (12) in the area of ​​the opening (34) has a smaller diameter than the largest diameter of the base (12) and / or wherein the radial thickness of the circumferential wall (26) increases downwards. Seating furniture according to one of the preceding claims, characterized in that the base (12) has a height (h) greater than about 12 cm, in particular greater than about 16 cm, and / or that the base (12) has a center of gravity which is located at or less than one third of the height (h), in particular at or less than one quarter of the height (h) of the base (12). Seating furniture according to one of the preceding claims, characterized in that the base (12) is made in one piece or has a first section (20) and a second section (22), wherein the first section (20) has the base (24) and the second section (22) has the circumferential wall (26). Seating furniture according to claim 14, characterized in that the first section (20) and / or the second section (22) is made of a solid material, in particular a plastic, in particular an expanded polypropylene (EPP) and / or an expanded thermoplastic polyurethane (E-TPU). Seating furniture according to claim 14 or 15, characterized in that the first section (20) and the second section (22) have the same density or different densities, wherein the density of the first section (20) is greater than the density of the second section (22). Seating furniture according to one of claims 14 to 16, characterized in that the first section (20) has a connecting area (36) at its upper end and the second section (22) has a connecting area (38) at its lower end, wherein the first section (20) and the second section (22) are attached to each other by means of the connecting areas (36, 38) in a form-fit and / or force-fit manner, in particular wherein the connecting areas (36, 38) are designed with complementary geometries, for example steps, wherein the steps rest on each other. Seating furniture according to claim 17, characterized in that one of the connecting areas (36, 38) has an undercut in the vertical direction (H) and the other of the connecting areas (38, 36) has a radial projection (40) that engages in the undercut, in particular wherein the undercut and the radial projection (40) extend along at least 75% of the circumference of the base (12), in particular completely along the circumference of the base (12). Seating furniture according to claim 17 or 18, characterized in that one of the connecting areas (36, 38) has at least one radial nose (42) and the other of the connecting areas (38, 36) has at least one recess (44) complementary to the nose (42), wherein the nose (42) engages in the recess. Base for a multi-part seating furniture (10), in particular for a seating furniture (10) according to one of the preceding claims, comprising a base (24), a circumferential wall (26), an upwardly open receiving space (28) and a standing surface (30) for resting on a substrate. Base according to claim 20, characterized in that the base has a first section (20) and a second section (22), wherein the first section (20) has the bottom (24) and the base (30), and wherein the second section (22) has the circumferential wall (26). Base according to claim 20 or 21, characterized in that the first section and the second section have the same density or different densities, wherein the density of the first section is greater than the density of the second section, and / or that the base has a center of gravity located at or less than one-third of the height, in particular at or less than one-quarter of the height of the base, and / or that the first section and / or the second section is made of a solid material, in particular a plastic, in particular an expanded polypropylene (EPP) and / or an expanded thermoplastic polyurethane (E-TPU).

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