Seat device and its star-shaped base

Abstract

The seat device and its star-shaped base (3) can be used in particular for office seats, work seats, stools or standing aids, and includes a central portion (4) and a plurality of extending arms (5) attached to the central portion (4) for resting on the ground, at least one of the extending arms (5) being rotatably hinged to the central portion (4). The seat surface of the seat device can be rotated or swung without the need to modify the parts attached to the upper end of the seat post, and in particular without the need to modify the support structure, the seat support on which the seat surface rests and the seat surface itself.

Description

[Technical field]

[0001] The present invention relates to a seating arrangement and its star base, in particular to a base for use in an office seat, work seat, stool or standing aid. [Background technology]

[0002] Currently, star-shaped pedestals are a standard solution for seating devices, especially office seats, task seats and stools. They are usually equipped with a height-adjustable seat post. The seat post has a support structure on which the seat rests. The support structure includes, for example, a base support, a seat support and, optionally, a back support. Star-shaped pedestals are typically applied in swivel chairs or swivel stools or seats. The seat of these devices is rotatable around the longitudinal axis of the seat post.

[0003] Currently, such so-called "movable seats" are being promoted from the viewpoint of ergonomics, regardless of the existing movable and adjustable seats. The posture of such a seat arrangement, for example its inclination, changes in response to the load and / or load changes on the seat arrangement, especially when the user of the seat arrangement sits in a different position of the seat arrangement or when the user's center of gravity changes due to movement. From this viewpoint, the seat arrangement may be designed to be rotatable or oscillating in each direction. For this purpose, structural modifications are often made to the conventional seat arrangements and support structures that have good performance. However, the mechanical plans thus generated are not only relatively complicated but also require high manufacturing costs. Generally, the design modification of the seat arrangement or support structure is aggravated by the addition of necessary parts and the provision of necessary space. Summary of the Invention [Problem to be solved by the invention]

[0004] The object of the present invention is to provide a seat device which allows the seat device to be rotated or rocked without modifying the existing parts at the upper end of the seat post of the seat device, in particular without modifying the support structure of the seat part or the seat surface. [Means for solving the problem]

[0005] This object is achieved according to the invention by the star base and seat arrangement as set forth in the independent claims. Preferred embodiments are set forth in the dependent claims.

[0006] One central idea of ​​the present invention is that the rotation and rocking of the seat or seat surface is achieved by modifying the lower end part of the seat post of the seat device. For this purpose, a movable star base is proposed.

[0007] The star-shaped base according to the present invention is characterized in that at least one of the extending arms attached to the center of the star-shaped base is rotatably hinged to the center. The seat according to the present invention is characterized in that it includes such a star-shaped base.

[0008] According to a first aspect of the present invention, a star base having extending arms rotatable relative to a central portion allows the position of the central portion to be changed, including lowering the central portion in a vertical direction and tilting the central portion relative to a horizontal plane, i.e., tilting relative to the ground. Therefore, in the seating device, all parts located above the central portion and supported by the central portion and the seat post fixed to the central portion, including the support structure and the seat, can rotate or swing in addition to moving downward, without the need for a special design of the support structure.

[0009] The extending arm attached to the center of the star base is usually fixed with rollers. The rollers allow the seat device to move on the ground. On the ground, the star base allows the seat device to stand up very safely and stably. However, the star base with rollers may cause the seat device to move unexpectedly or roll on the ground even when the user is sitting on the seat device. Such unexpected movement of the seat device is usually dangerous even if the rolling movement of the seat device is very small. That is, the user may fall or be injured by the seat device accidentally rolling, or may be disturbed by the seat device moving while sitting. These dangers are more prominent when the user of the seat device is an elderly person.

[0010] According to the second aspect of the present invention, the solution of the present invention can avoid unexpected rotation or unexpected movement of the seat device. Here, the seat device refers to a star-shaped base with an extension arm on which a roller is attached. In this way, when a user applies a load to the seat surface of the seat device, the center of the star-shaped base can be lowered to the ground due to the rotatability of the extension arm. Since the user applies gravity to the seat, the static friction force generated in the center by this gravity can avoid unexpected rolling or unexpected movement of the seat. The static friction force here is greater than the rolling friction force required for rolling. In this simple method, a safe seat or stool can be provided, which is attractive to the elderly. At the same time, such a seat can be suitably used in a work situation. In a work situation, the unexpected movement of the seat interferes with work, but movement is necessary and it is not possible to give up using it.

[0011] Also common in the technical field are seats in the form of standing aids. These standing aids rarely have a star base. Even less often, rollers are attached to the base of the standing aid. In standing aids, such "movable seats" are usually realized by mounting a joint close to the ground so that the base supporting the seat can rotate.

[0012] According to a third aspect of the invention, the invention allows the realization of a novel standing aid, in which, when the seat is fully loaded, the central part of the star base descends to the ground and forms the support and rotation point of the standing aid. Such a state in which the extension arm is firmly supported on the ground ensures that the standing aid is in a very safe state. Also, the limited deflection of the extension arm limits the rotation of the standing aid, thus avoiding unfavourable extreme conditions that may cause the standing aid to tip over and cause injury.

[0013] The present invention is therefore suitable for use in office seats, work seats and stools as well as in standing aids.

[0014] In a preferred embodiment of the invention, each of the solutions can contribute to the solution of the invention, either alone or in combination with each other. According to a preferred embodiment of the invention, each of the extension arms rotatable relative to the central part comprises: a) They are connected in the middle so that they can rotate independently without affecting each other. b) Each can be rotated to its full extent from its initial, unrotated position and restored. c) rotate relative to the center such that ground clearance of the free ends of the extension arms is maintained during rotation; and / or d) As the central section is lowered, the extension arms rotate relative to the central section so as to maintain contact with the ground.

[0015] According to another preferred embodiment of the present invention, the number of extension arms rotatably hinged to the central portion is set so that the central portion can be lowered to the ground when the extension arms rotate simultaneously, so that if the gravitational load on the seat device can be sufficiently large, the central portion can be lowered to the ground and the seat device can be used as a standing assistance device.

[0016] According to a preferred embodiment of the present invention, the bottom surface of the central part, i.e., the surface of the central part facing the ground, is formed as a convex surface. The convex support surface is preferably a spherical surface. With such a spherical surface support, the grounded central part can easily achieve the desired rotation and oscillation.

[0017] According to a particularly preferred embodiment of the invention, all the extension arms are pivotally hinged at the center. According to a preferred embodiment of the invention, the number of extension arms may be four or six, but is preferably five.

[0018] In accordance with a preferred embodiment of the present invention, each of the extension arms which rotate relative to the central portion resists the elastic force of the elastic member as it rotates.

[0019] According to a preferred embodiment of the invention, each of the extension arms that rotate relative to the central part is provided with an elastic member that acts between the extension arm and the central part, i.e. one end of the elastic member acts on the extension arm and the other end on the central part. In a simple example, the elastic member is a compression spring or an elastic block designed according to geometrical conditions and made of elastic material.

[0020] For this purpose, a separate elastic member may be provided, for example a ring-shaped elastic block, which may be easily fitted around the central portion.

[0021] When using elastic members, the seating arrangement produces useful rotation and rocking movements as well as upright or return movements due to the elastic action. The elastic action provides a limited resistance when the seating arrangement is loaded, such as when a user sits on the seating arrangement. The user of the seating arrangement cannot move the seating arrangement without resisting this elastic force with the load. When the load on the seating arrangement changes, for example due to the user's movement on the seat surface or due to a change in the position of the user's center of gravity, the elastic action provides a defined rotation resistance. The user of the seating arrangement must move the seating arrangement against this elastic force when rotating or rocking. At the same time, a corresponding elastic action occurs depending on whether the force applied is increased or decreased. Such a supporting elastic force allows the movement of the center part to return to its initial position. When the seating arrangement is completely unloaded, i.e. when the seating arrangement is unloaded and the user stands up, for example, the center part of the star base and the seat surface automatically return to the upright state in the vertical direction.

[0022] According to a preferred embodiment of the invention, rollers are preferably attached to the free ends of the extending arms. These rollers can be used to move the star base. Instead of rollers, sliding parts or other similar parts can be used.

[0023] According to a preferred embodiment of the invention, either the rotation of one or all of the extension arms or the lowering and tilting functions of the central part can be locked by a locking device, which is preferably designed to simultaneously lock the rotation of all extension arms from their starting position with one locking action. Thus, a star base constructed according to the invention can be used as a conventional non-moving base if desired.

[0024] According to a preferred embodiment of the invention, the locking is effected mechanically, preferably by movement of a suitable locking member at least partially filling the rotation space required for rotation of the extension arm and mechanically locking or otherwise locking the extension arm against inward rotation within the rotation space. [Brief description of the drawings]

[0025] Embodiments of the invention can be explained in more detail with reference to the following drawings.

[0026] [Figure 1] A seat device equipped with a star-shaped base. [Diagram 2] FIG. [Diagram 3] FIG. 13 is a side view of an unloaded star base. [Figure 4] FIG. 13 is a side view of a star-shaped base with uniform loading. [Diagram 5] FIG. 13 is a side view of a star base with non-uniform loading. [Figure 6] FIG. 6 is a detailed cross-sectional view of side view 5.

[0027] All drawings are not to scale but are schematic representations of the present invention and include only essential components, with the same reference numbers representing the same parts or parts with similar functions. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] The seating device according to the invention can be either an office seat, a work seat, a stool or a standing aid. In this embodiment, a stool is taken as an example. The stool 1 stands on the ground 2 via its base. The base is designed as a star base 3. The star base 3 comprises a central part 4 (also called the "hub") and five extending arms 5 attached to the central part. The extending arms are uniformly distributed along the central part. Rollers 6 are fixed to the free ends of the extending arms 5. In the middle of the central part 4 is a receiving sleeve 7 for a seat post 8. The height of the seat post 8 is adjustable by a gas spring (not shown).

[0029] The upper surface of the seat post 8 is a support structure for mounting a seating surface 9. In this simple example shown here, the support structure includes a base support 10 and a seat support 12. The base support 10 is mounted on the seat post 8 with a conical receiving member 11, and the seat support 12 is connected to the base support 10. The upper surface of the seat support 12 is the final seating surface 9 with a seat cushion. The seat support 12 and the seating surface 9 are rotatable about an axis of rotation of the seat post longitudinal axis 13.

[0030] All five extending arms 5 attached to the central portion have respective rotational joints and are rotatably hinged to the central portion 4. The rotation axis 14 shown in FIG. 2 is for directional purposes and is parallel to the support surface 15 of the roller 6.

[0031] Each extension arm 5 is individually connected to the central portion 4 and rotates without being influenced by the other extension arms 5. The extension arms 5 can rotate from a non-rotating initial position shown in Figures 3 and 4 to a maximum deflection position shown in Figure 5, and can be rotated back to their original position. As shown in Figure 6, the maximum rotation position and degree of deflection of the extension arms 5 are determined by the stopper 16 of the central portion 4.

[0032] The structure is characterized in that the extension arms 5 rest stably on the support surface 15, i.e. supported on the ground 2. This is independent of whether the seat 9 is loaded or not, and independent of whether the central part 4 is lowered and / or tilted or not. In other words, the extension arms 5 rotate relative to the central part 4 in such a way that, during rotation, the ground clearance of the free ends of the extension arms 5 is maintained. The free ends are maintained in contact with the ground by rollers 6 or similar members. The structure is designed such that, when the central part 4 is lowered, the extension arms 5 maintain contact with the ground while rotating relative to the central part 4. Depending on the degree of deflection of each extension arm 5, the central part 4 can be lowered to such an extent that it comes into contact with the ground 2.

[0033] The bottom surface of the central part facing the ground 2 is formed convexly and forms an arch-shaped rolling support surface 17. When the central part 4 comes into contact with the ground, it can roll along this support surface, which allows the seat device to rotate or swing in the fully lowered state.

[0034] When the extension arms 5 rotate relative to the central part 4, they must resist the elastic force of the elastic member. Each extension arm 5 is provided with an elastic member. In FIG. 6, the elastic member of the extension arms 5 is simply symbolically shown as a compression spring 18. The elastic member is arranged to function between one end of the extension arm 5 and the other end of the central part 4. When the load on the extension arms 5 is removed or reduced, the elastic member 18 can pull the extension arms 5 back to their initial position from the rotated position.

[0035] The rotation of all the extension arms 5 can be locked simultaneously by an annular locking member 21 attached to the central part 4. The locking member is rotatable about a rotation axis in the direction of the seat post longitudinal axis 13 with respect to the central base from a central position (see FIG. 6) to a locked position. A brake member (not shown) attached to the locking member 21 is guided on the back surface 22 of the extension arms 5, which back surface faces the central part 4. Mainly, the rotation space 19 is filled at the same time, and a mechanical connection for transmitting force is formed at least in the adjacent area between the back surface 22 and the stopper 16. This prevents the extension arms 5 from moving into the rotation space 19 and from rotating. The locking member 21 abutting the central part 4 has an arc-shaped guide groove 25, into which a guide pin 26 attached to the central base is fitted. In the rotation space 19, the extension arms 5 are rotatable with respect to the central part 4. The rotation space 19 provides a free interval 20. On one side of this gap is the rear surface 22 of the extension arm 5, and on the other side is the stop 16 attached inside the central section. This gap determines the maximum degree of deflection possible.

[0036] Figure 3 shows the star base 3 of the stool 1 when the seat 9 is not under load. All the rollers 6 are on the ground 2. The rolling support surface 17 of the bottom surface of the central part is spaced from the ground 2. The distance between the lowest point of the bottom surface of the central part and the ground 2 is preferably in the order of a few centimetres.

[0037] When the load on the seat 9 is uniform, the central part 4 moves vertically and does not tilt horizontally. When the gravitational load on the seat is large enough, the central part 4 descends vertically onto the ground 2 along the descending direction 23, as shown in FIG. 4. At the same time, all the extension arms 5 are deflected upwards along the deflection direction 28 in the same way, in particular along the same path. The rollers 6 are always supported on the ground 2.

[0038] When the user not only moves the seat 9 downwards, but also rotates or rocks, the frictional effect of the spherical central bottom surface during rolling prevents the stool 1 from rolling. The extension arm 5 acts as an additional support to ensure the stool 1 is safely raised up.

[0039] If the position of the user's centre of gravity changes, the seat 9 is loaded unevenly and may rotate or sway (indicated by the arrow 24 in Fig. 1). The central part 4, which still lies on the ground 2, is inclined with respect to the vertical (see Figs. 5 and 6). Depending on the direction of the inclination, some of the extension arms 5 rotate more and some rotate less. Such inclination of the central part 4 also occurs if the central part 4 is not yet in contact with the ground. The extension arms 5 are deflected further upwards if the load on the seat 9 is uneven or if the deflection rotation or sway with respect to the vertical is very strong. Nevertheless, the rollers 6 remain in contact with the ground. That is to say, the rollers 6 are always on the ground and provide an additional support surface. The central part 4 is inclined to different degrees in different spatial directions depending on the direction of action of the load applied by the user to the stool 1 and taking into account the restoring forces provided by the elastic members 18. This means that deflections of different strengths occur for the extension arms 5 attached to the central part 4. Fig. 5 shows the case where the central portion is lowered and inclined, and Fig. 6 is a cross-sectional view of this case when the extension arm is in an intermediate position where it has rotated relatively little.

[0040] The lowering and tilting of the central part 4 can be performed simultaneously. When the lowering of the central part 4 reaches the ground, the central part 4 can be tilted further.

[0041] The downward movement and tilting movement of the central part 4, as well as the rotation and swinging of the seat surface 9, are restricted by the elastic force of the elastic members 18 attached to the extension arms 5. The downward path of the central part 4, or the rotation path of the extension arms 5, and the restoring force of each elastic member 18 accompanying the movement of the central part 4 show a linear relationship. At the same time, the tilting movement of the central part 4 and the rotation and swinging of the seat surface 9 can be regulated. This is achieved by setting the maximum deflection of the extension arms 5. When the extension arms 5 reach the maximum deflection, they abut against the stoppers 16 provided on the central part 4. The downward movement is restricted not by the extension arms 5 abutting against the central part 4, but by the central part 4 descending to the ground 2.

[0042] The present invention relates to a star base on a seating arrangement, which can be used in particular for office seats, work seats, stools or standing aids. In order to provide a seating arrangement 1 in which the seat surface 9 can rotate or sway without modifying the parts attached to the upper end of the seat post 8, in particular without modifying the support structure 10, the seat support 12 on which the seat surface 9 rests and the seat surface 9 itself, the movement or sway of the seat surface 9 is realized by modifying the parts attached to the lower end of the seat post 8 of the seating arrangement 1, i.e. by attaching a movable star base 3. The star base 3 is characterized in that at least one of the extending arms 5 attached to the central part 4 is hinged to the central part 4 so as to be rotatable.

[0043] In another embodiment, the central portion has a plurality of extension portions each extending in all four directions, the extension portions being provided in one-to-one correspondence with the extension arms, at least one or all of the extension arms being hingedly connected to the corresponding extension portion of the central portion, and an elastic member being provided between the extension arm and the corresponding extension portion to impart an elastic force resisting rotation of the extension arm relative to the central portion, and other configurations refer to the configurations of the above-mentioned embodiments.

[0044] In another embodiment, at least one or all of the extension arms are hinged to the central portion and further connected to the central portion via one link, thereby forming a crank slide mechanism between the extension arms, the link, and the central portion. One end of the link is hinged to the central portion and the other end of the link is slidably connected to the extension arms. Or, one end of the link is hinged to the extension arms and the other end of the link is slidably connected to the central portion. In addition, an elastic member (preferably a compression spring or a tension spring) that applies an elastic force against rotation of the extension arms relative to the central portion is provided between any two of the link, the extension arms, and the central portion, and other configurations refer to the configurations of the above-mentioned embodiments.

[0045] In another embodiment, at least one or all of the extension arms are hinged to the central portion and further connected to the central portion via two links, thereby forming a planar four-joint link mechanism between the extension arms, the two links, and the central portion. An elastic member (preferably a compression spring or a tension spring) is provided between any two of the extension arms, the two links, and the central portion, for applying an elastic force against rotation of the extension arms relative to the central portion. Other structures are provided with reference to the above-mentioned embodiments.

[0046] In each of the above embodiments, the number of extending arms of the star-shaped base may be three, four, five, six or more than six, with five being preferred.

[0047] All features disclosed in this specification, the appended claims and the accompanying drawings, either alone or in any combination thereof, are essential features of the invention.

[0048] In the description of this specification, a description referring to terms such as "one example", "several examples", "one embodiment", "specific embodiment", "other embodiment", "example", "specific example", or "several examples" means that a specific configuration, structure, material, or feature described in connection with this example or example is included in at least one example, embodiment, or example of the present invention. In this specification, general expressions of the above terms do not necessarily mean the same example or example. Furthermore, the specific configurations, structures, materials, or features described above can be combined in an appropriate manner in any one or more examples, embodiments, or examples. The technical means described in the present invention also include any one or more specific configurations, structures, materials, or features described above formed alone or in combination.

[0049] Although the embodiments of the present invention have been described above, the above embodiments are illustrative and are not intended to limit the present invention. Those skilled in the art may change, modify, substitute, transform, delete or add some components to the above embodiments or make new combinations to create new technical means within the scope of the present invention without departing from the principles and spirit of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the innovative principles of the present invention all belong to the technical scope of the present invention.

[0050] (Additional Note) (Appendix 1) The device includes a central portion (4) and a plurality of extending arms (5) attached to the central portion (4) for placement on the ground; At least one of these extending arms (5) is rotatably hinged to the central portion (4) of the star-shaped base (3).

[0051] (Appendix 2) A star-shaped base (3) as described in Appendix 1, characterized in that each of the extending arms (5) that can rotate relative to the central portion is rotatably connected to the central portion (4) independently and without being influenced by the other extending arms (5).

[0052] (Appendix 3) Each of the extension arms (5) rotatable relative to the central portion (4) can rotate from an initial position to a maximum rotatable position and return to its original position; and / or each of the extension arms (5) rotatable relative to the central portion (4) rotates relative to the central portion (4) such that, during rotation, ground clearances of the free ends of the extension arms (5) are maintained; and / or each of the extension arms (5) rotatable relative to the central portion (4) rotates relative to the central portion (4) such that contact between the extension arms (5) and the ground is maintained when the central portion (4) is lowered; and / or 2. The star-shaped base (3) of claim 1, wherein at least a plurality of extending arms (5) are rotatably hinged to a central portion (4) such that, upon simultaneous rotation of the extending arms (5), the central portion (4) can be lowered to a position where it comes into contact with the ground (2).

[0053] (Appendix 4) 2. The star-shaped base (3) according to claim 1, wherein all of the extending arms (5) are rotatably hinged to the central portion (4).

[0054] (Appendix 5) The star-shaped base (3) according to claim 1, wherein all five extending arms (5) are attached to a central portion (4).

[0055] (Appendix 6) 2. The star-shaped base (3) according to claim 1, wherein the bottom surface (17) of the central portion is formed in a convex shape.

[0056] (Appendix 7) 2. The star-shaped base (3) according to claim 1, characterized in that a roller (6) is fixed to the free end of the extending arm (5).

[0057] (Appendix 8) The star-shaped base (3) according to any one of claims 1 to 7, wherein each of the extending arms (5) rotatable relative to the central portion (4) resists the elastic force of an elastic member (18) during rotation.

[0058] (Appendix 9) 9. The star-shaped base (3) as described in claim 8, wherein one end of the elastic member (18) acts on the extending arm (5) and the other end of the elastic member (18) acts on the central portion (4).

[0059] (Appendix 10) The star-shaped base (3) according to claim 9, wherein the elastic member (18) is a compression spring.

[0060] (Appendix 11) 8. The star-shaped base (3) according to any one of claims 1 to 7, wherein the rotation of one or all of the extending arms (5) can be locked by a locking member (21).

[0061] (Appendix 12) The locking member (21) is an annular locking member attached to the central portion (4) and can simultaneously lock the rotation of all the extending arms (5). The star-shaped base (3) described in Appendix 11, characterized in that when the locking member (21) rotates around the seat post vertical axis (13) relative to the central portion (4) to the locked position, the brake member of the locking member (21) is fitted between the central portion (4) and the extension arm (5), thereby preventing rotation of the extension arm (5) relative to the central portion (4).

[0062] (Appendix 13) The star-shaped base (3) described in Appendix 12, characterized in that an arc-shaped guide groove (25) is formed in the locking member (21), and a guide pin (26) attached to the central portion (4) is fitted into the guide groove (25).

[0063] (Appendix 14) The star-shaped base (3) according to any one of Appendices 1 to 7, characterized in that the central portion has a plurality of extension portions each extending in all four directions, the extension portions being provided in one-to-one correspondence with the extension arms, at least one or all of the extension arms being hingedly connected to the corresponding extension portions, and an elastic member being provided between the extension arms and the corresponding extension portions to apply an elastic force resisting rotation of the extension arms relative to the central portion.

[0064] (Appendix 15) The star-shaped base (3) according to any one of appendices 1 to 7, wherein the extending arm is further connected to a central portion via a plurality of links.

[0065] (Appendix 16) The star-shaped base (3) described in Appendix 15, characterized in that the extension arm is connected to the central portion via a single link, thereby forming a crank slide mechanism between the extension arm, the link, and the central portion, one end of the link is hingedly connected to the central portion and the other end of the link is slidably connected to the extension arm, or one end of the link is hingedly connected to the extension arm and the other end of the link is slidably connected to the central portion, and an elastic member is provided between any two of the link, the extension arm, and the central portion to apply an elastic force against rotation of the extension arm relative to the central portion.

[0066] (Appendix 17) The star-shaped base (3) described in Appendix 15 is characterized in that the extension arm is connected to the central portion via two links, thereby forming a planar four-bar link mechanism between the extension arm, the two links, and the central portion, and an elastic member is provided between any two of the extension arm, the two links, and the central portion to apply an elastic force against rotation of the extension arm relative to the central portion.

[0067] (Appendix 18) A seating device (1), in particular an office seat, a work seat, a stool or a standing aid, characterized in that it has a star-shaped base (3) according to any one of appendices 1 to 17. [Explanation of symbols]

[0068] 1: seat device, stool, 2: ground, 3: star-shaped base, 4: central part, 5: extension arm, 6: roller, 7: storage sleeve, 8: seat post, 9: seat surface, 10: base support, 11: conical storage member, 12: seat support, 13: seat post vertical axis, 14: rotation axis, 15: support surface, 16: stopper, 17: rolling support surface, bottom surface of central part, 18: elastic member, compression spring, 19: rotation space, 20: free spacing, 21: locking member, 22: rear surface of extension arm, 23: downward direction, 24: rotation and swing direction, 25: guide groove, 26: guide pin, 27: vertical direction, 28: deflection direction.

Claims

1. The device includes a central portion (4) and a plurality of extending arms (5) attached to the central portion (4) for placement on the ground; A roller (6) is fixed to the free end of the extending arm (5), At least one of these extending arms (5) is hinged to the central portion (4) so ​​as to be rotatable about an axis parallel to the ground; the locking member (21) is an annular locking member attached to the central portion (4), and the locking member (21) is rotatable with respect to a base of the central portion (4) about a rotation axis in the direction of the seat post vertical axis (13) from a central position to a locking position, and can simultaneously lock the rotation of all of the extension arms (5); a rotation space (19) is formed between the back surface (22) of the extension arm (5) and a stopper (16) mounted in the central part (4), in which the extension arm (5) can be deflected relative to the central part (4), the rotation space (19) providing a free interval (20), one side of which is the back surface (22) of the extension arm (5) and the other side of which is said stopper (16), which determines the maximum degree to which the extension arm (5) can be deflected into the rotation space (19), and when the extension arm (5) reaches the maximum deflection, it abuts against said stopper (16); When the locking member (21) is rotated to the locked position and the brake member attached to the locking member (21) is guided against the back surface (22) of the extension arm (5), the rotation spaces (19) for all the extension arms (5) are filled simultaneously, and a mechanical connection for transmitting force is formed in the free space (20) between the back surface (22) and the stopper (16), thereby preventing the extension arm (5) from deflecting into the rotation space (19) and preventing the extension arm (5) from rotating.

2. 2. The star-shaped base (3) according to claim 1, characterized in that each of the extending arms (5) which can rotate relative to the central part is rotatably connected to the central part (4) independently and without influence from the other extending arms (5).

3. Each of the extension arms (5) rotatable relative to the central portion (4) can rotate from an initial position to a maximum rotatable position and return to its original position; and / or each of the extension arms (5) rotatable relative to the central portion (4) rotates relative to the central portion (4) such that during rotation, the ground clearance of the free ends of these extension arms (5) is maintained via rollers (6); and / or each of the extension arms (5) rotatable relative to the central portion (4) rotates relative to the central portion (4) such that contact between the extension arms (5) and the ground is maintained via rollers (6) when the central portion (4) is lowered; and / or 2. The star base (3) according to claim 1, characterized in that at least a number of the extending arms (5) are rotatably hinged to the central portion (4) so ​​that, upon simultaneous rotation of the extending arms (5), the central portion (4) can be lowered to such an extent that it comes into contact with the ground (2).

4. 2. Star base (3) according to claim 1, characterized in that all of the extending arms (5) are rotatably hinged to the central part (4).

5. 2. The star-shaped base (3) according to claim 1, characterized in that the five extending arms (5) are all attached to the central portion (4).

6. 2. Star-shaped seat (3) according to claim 1, characterized in that the bottom surface (17) of the central part is formed in a convex shape.

7. 2. The star-shaped base (3) according to claim 1, characterized in that the locking member (21) abutting against the central portion (4) is formed with an arc-shaped guide groove (25), and a guide pin (26) attached to the central portion (4) is fitted into the guide groove (25).

8. The star-shaped base (3) according to any one of claims 1 to 7, characterized in that each of the extending arms (5) which can rotate relative to the central portion (4) is returned from the rotated position to its initial position by the elastic force of an elastic member (18) provided between the extending arm (5) and the central portion (4).

9. The device includes a central portion (4) and a plurality of extending arms (5) attached to the central portion (4) for placement on the ground; At least a few of these extending arms (5) are hinged to the central portion (4) so ​​as to be rotatable about an axis parallel to the ground; Each of the extension arms (5) that can rotate with respect to the central portion is rotatably connected to the central portion (4) independently and without being influenced by the other extension arms (5); A roller (6) is fixed to the free end of the extending arm (5), Each of the extension arms (5) rotatable relative to the central portion (4) can rotate from an initial position to a maximum rotatable position and return to its original position; And, each of the extension arms (5) rotatable relative to the central portion (4) rotates relative to the central portion (4) such that during rotation, the ground clearance of the free ends of these extension arms (5) is maintained via rollers (6); And, each of the extension arms (5) rotatable relative to the central portion (4) rotates relative to the central portion (4) such that contact between the extension arms (5) and the ground is maintained via rollers (6) when the central portion (4) is lowered; And, At least a plurality of extension arms (5) are rotatably hinged to the central portion (4) such that, upon simultaneous rotation of the extension arms (5), the central portion (4) can be lowered to a point where it comes into contact with the ground (2); Each of the extension arms (5) that can rotate with respect to the central portion (4) is returned from the rotated position to the initial position by the elastic force of an elastic member (18) provided between the extension arm (5) and the central portion (4); A receiving sleeve (7) is formed in the center of the central portion (4) to receive the lower end of the seat post (8) and to erect the seat post (8). One end of the elastic member (18) acts on the extension arm (5), and the other end of the elastic member (18) acts on the central portion (4); The star-shaped base (3) is characterized in that the elastic member (18) is a compression spring.

10. The device includes a central portion (4) and a plurality of extending arms (5) attached to the central portion (4) for placement on the ground; At least a few of these extending arms (5) are hinged to the central portion (4) so ​​as to be rotatable about an axis parallel to the ground; Each of the extension arms (5) that can rotate with respect to the central portion is rotatably connected to the central portion (4) independently and without being influenced by the other extension arms (5); A roller (6) is fixed to the free end of the extending arm (5), Each of the extension arms (5) rotatable relative to the central portion (4) can rotate from an initial position to a maximum rotatable position and return to its original position; And, each of the extension arms (5) rotatable relative to the central portion (4) rotates relative to the central portion (4) such that during rotation, the ground clearance of the free ends of these extension arms (5) is maintained via rollers (6); And, each of the extension arms (5) rotatable relative to the central portion (4) rotates relative to the central portion (4) such that contact between the extension arms (5) and the ground is maintained via rollers (6) when the central portion (4) is lowered; And, At least a plurality of extension arms (5) are rotatably hinged to the central portion (4) such that, upon simultaneous rotation of the extension arms (5), the central portion (4) can be lowered to a point where it comes into contact with the ground (2); Each of the extension arms (5) that can rotate with respect to the central portion (4) is returned from the rotated position to the initial position by the elastic force of an elastic member (18) provided between the extension arm (5) and the central portion (4); A receiving sleeve (7) is formed in the center of the central portion (4) to receive the lower end of the seat post (8) and to erect the seat post (8). the locking member (21) is an annular locking member attached to the central portion (4), and the locking member (21) is rotatable with respect to a base of the central portion (4) about a rotation axis in the direction of the seat post vertical axis (13) from a central position to a locking position, and can simultaneously lock the rotation of all of the extension arms (5); a rotation space (19) is formed between the back surface (22) of the extension arm (5) and a stopper (16) mounted in the central part (4), in which the extension arm (5) can be deflected relative to the central part (4), the rotation space (19) providing a free interval (20), one side of which is the back surface (22) of the extension arm (5) and the other side of which is said stopper (16), which determines the maximum degree to which the extension arm (5) can be deflected into the rotation space (19), and when the extension arm (5) reaches the maximum deflection, it abuts against said stopper (16); When the locking member (21) is rotated to the locked position and the brake member attached to the locking member (21) is guided against the back surface (22) of the extension arm (5), the rotation spaces (19) for all the extension arms (5) are filled simultaneously, and a mechanical connection for transmitting force is formed in the free space (20) between the back surface (22) and the stopper (16), thereby preventing the extension arm (5) from deflecting into the rotation space (19) and preventing the extension arm (5) from rotating.

11. The star-shaped base (3) according to claim 10, characterized in that the locking member (21) is an annular locking member attached to the central portion (4), an arc-shaped guide groove (25) is formed in the locking member (21), and a guide pin (26) attached to the central portion (4) is fitted into the guide groove (25).

12. 9. Star base (3) according to claim 8, characterized in that one end of the elastic member (18) acts on the extending arm (5) and the other end of the elastic member (18) acts on the central part (4).

13. Star base (3) according to claim 12, characterized in that the elastic member (18) is a compression spring.

14. The star-shaped base (3) according to any one of claims 1 to 6, characterized in that the central portion has a plurality of extension portions each extending in all four directions, the extension portions being provided in one-to-one correspondence with the extension arms, at least one or all of the extension arms being hingedly connected to the corresponding extension portions, and an elastic member being provided between the extension arms and the corresponding extension portions to apply an elastic force resisting rotation of the extension arms relative to the central portion.

15. The star-shaped base (3) according to any one of claims 1 to 6, characterized in that the extending arms are further connected to the central portion via a link.

16. The star-shaped base (3) according to claim 15, characterized in that the extension arm is connected to the central portion via a single link, thereby forming a crank slide mechanism between the extension arm, the link and the central portion, one end of the link is hingedly connected to the central portion and the other end of the link is slidably connected to the extension arm, or one end of the link is hingedly connected to the extension arm and the other end of the link is slidably connected to the central portion, and an elastic member is provided between any two of the link, the extension arm and the central portion to apply an elastic force resisting rotation of the extension arm relative to the central portion.

17. The star-shaped base (3) according to claim 15, characterized in that the extension arm is connected to the central portion via two links, thereby forming a planar four-joint link mechanism between the extension arm, the two links and the central portion, and an elastic member is provided between any two of the extension arm, the two links and the central portion to apply an elastic force resisting rotation of the extension arm relative to the central portion.

18. A seating arrangement (1), in particular an office seat, work seat, stool or standing aid, characterized in that it comprises a star base (3) according to any one of the claims 1 to 17.

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