Rotating device and chair using the rotating device

Abstract

This invention provides a thin rotating device and a chair using the rotating device. The rotating device includes a first base plate 10, a central shaft 20 protruding upward from the upper surface of the first base plate 10, at least one support 30 protruding upward from the upper surface of the first base plate 10, an annular elastic body 40 disposed between the central shaft 20 and the support 30, a second base plate 70 covering the first base plate 10 and rotatably assembled around the central shaft 20, and a drive body 50 disposed within the annular elastic body 40 and rotating integrally with the second base plate 70 to push the annular elastic body 40. As the second base plate 70 rotates, the drive body 50 is displaced from its initial state, causing the annular elastic body 40 to elastically deform. On the other hand, the elastic force of the elastically deformed annular elastic body 40 pushes the drive body 50 back to its initial state, thereby restoring the second base plate 70 to its initial state.

Description

Technical Field

[0001] This utility model relates to a rotating device, and more particularly to a rotating device with the function of automatically returning to its initial state. Background Technology

[0002] Conventionally, as a rotating device, there is, for example, a swivel chair, characterized in that a support shaft with a seat attached to its upper end is mounted on a shaft cylinder that is stacked on the floor or footrest in a manner that allows it to rotate and move up and down, and a protrusion eccentrically located below the lower end of the support shaft is positioned above the eccentric upper surface of a rotating platform that is inclined and rotates within the shaft cylinder (see Patent Document 1).

[0003] Patent documents [Patent Document 1] Japanese Patent Publication No. 2-19340. Utility Model Content

[0004] However, the support structure of the aforementioned swivel chair has the problem of a large height dimension in the axial direction, making it impossible to obtain a thin swivel device.

[0005] In view of the above-mentioned problems, the present invention aims to provide a thin rotating device.

[0006] To solve the above-mentioned problems, the rotating device involved in this utility model has the following structure: It has a first substrate; A central axis protruding upward from the upper surface of the first substrate; At least one support protruding upward from the upper surface of the first substrate; An annular elastic body is installed between the aforementioned central shaft and the aforementioned support body; A second substrate, which is assembled to cover the first substrate and is rotatably mounted around the central axis; and A drive body disposed within the aforementioned annular elastic body and rotating integrally with the aforementioned second substrate to push against the aforementioned annular elastic body. As the second substrate rotates, the driving body begins to move from its initial state, causing the annular elastomer to undergo elastic deformation. On the other hand, the elastic force of the aforementioned annular elastomer, which has undergone elastic deformation, is used to push the aforementioned driving body back to the initial state, thereby restoring the second substrate to the initial state.

[0007] According to this invention, a drive mechanism for automatically restoring the second substrate to its initial state is disposed on the first substrate. Therefore, the rotating device as a whole forms a flat structure, thereby enabling a thin rotating device.

[0008] In particular, it has the effect of having a thin rotating device that can automatically return to its initial state even if rotated 360 degrees in either the clockwise or counterclockwise direction.

[0009] As an embodiment of this utility model, multiple rolling elements may be arranged in a ring around the central axis between the first substrate and the second substrate.

[0010] According to this embodiment, by rotating multiple rolling elements, the coefficient of friction between the first substrate and the second substrate decreases, and a rotating device that can perform smooth rotational movements can be obtained.

[0011] As another embodiment of this utility model, one end of an annular elastic body can also be mounted on a cylindrical body that is rotatably mounted on a central shaft.

[0012] According to this embodiment, the annular elastomer is supported by a cylindrical body mounted on a central shaft. Therefore, the curvature of the annular elastomer is reduced, stress concentration is less likely to occur, and a rotating device with a long service life can be obtained.

[0013] In another embodiment of this utility model, the other end of the annular elastic body can be mounted on the cylindrical body of the support in a rotatable manner.

[0014] According to this embodiment, the annular elastomer is supported by a cylindrical body mounted on a support. Therefore, the curvature of the annular elastomer is reduced, stress concentration is less likely to occur, and a rotating device with a long service life can be obtained.

[0015] As a different embodiment of this utility model, the support body can also be multiple support pins arranged side by side.

[0016] According to this embodiment, the curvature of the annular elastic body mounted on multiple support pins is reduced, making it less prone to stress concentration and resulting in a rotating device with a long service life.

[0017] As a different embodiment of this utility model, the support body may also be a support pin formed by cutting and flipping up the first substrate.

[0018] According to this embodiment, the number of parts / assembly time is reduced, and productivity is increased.

[0019] As a different embodiment of this utility model, the annular elastomer can be circular in cross-section or square in cross-section.

[0020] In addition, a ring-shaped elastomer can have a trapezoidal cross-section or an elliptical cross-section.

[0021] According to these embodiments, by selecting annular elastomers as needed, a rotating device that performs the desired rotational action can be obtained.

[0022] As a different embodiment of this utility model, a limiting body may also be provided to avoid a jamming state that may occur when the driving body is located on the extension line of the straight line connecting the central shaft and the support body.

[0023] According to this embodiment, a thin rotating device can be obtained that does not need to worry about forming a so-called taut state even if it is rotated 360 degrees in either the clockwise or counterclockwise direction, and will automatically return to the initial state.

[0024] As a different embodiment of this utility model, the limiting body can also be installed on the central shaft and has a protrusion that presses against the driving body to form an unstable state.

[0025] According to this embodiment, since it is mounted on the central shaft, a rotating device that is easy to assemble can be obtained.

[0026] As a different embodiment of this utility model, the limiting body can also be fixed to the first substrate and have a pin shape that is pressed against the driving body to form an unstable state.

[0027] According to this embodiment, by fixing it to the first substrate, a rotating device that can ensure stable operation can be obtained.

[0028] As a chair involved in this utility model, there exists a chair equipped with a rotating device according to any of the above embodiments.

[0029] According to this invention, by applying it to, for example, the seat of a chair, a chair with a seat that has a small volume and a relatively thin thickness can be obtained. Attached Figure Description

[0030] Figure 1 A perspective view showing the first embodiment of the rotating device involved in this utility model application; Figure 2 for Figure 1 An exploded perspective view of the rotating device shown. Figure 3 for Figure 1 A partial sectional view of the rotating device along line III-III shown; Figure 4 for Figure 1 Other exploded 3D views; Figure 5 for Figure 1 Another exploded three-dimensional view; Figure 6 To showcase Figure 1A top view of the initial state of the rotating device involved; Figure 7 To showcase Figure 1 A top view of the rotating device involved during its clockwise rotation (90 degrees); Figure 8 To showcase Figure 1 A top view of the rotating device involved during its clockwise rotation (180 degrees); Figure 9 To showcase Figure 1 A top view of the rotating device in the counterclockwise direction (90 degrees) during its rotation. Figure 10 A top view showing a second embodiment of the rotating device according to this utility model application; Figure 11 This is a perspective view of the components involved in the second embodiment; Figure 12 for Figure 10 An exploded perspective view of the rotating device shown. Figure 13 A top view showing a third embodiment of the rotating device according to this utility model application; Figure 14 for Figure 13 A perspective view of the components involved in the rotating device shown; Figure 15 for Figure 13 An exploded perspective view of the rotating device shown. Figure 16 To showcase Figure 2 A top view of the components of the rotating device according to the first embodiment shown; Figure 17 for Figure 16 The sectional view of the component shown is along line XVII-XVII; Figure 18 A perspective view showing the components involved in the fourth embodiment of the rotating device according to this utility model application; Figure 19 for Figure 18 The sectional view of the component shown along line XIX-XIX; Figure 20 A cross-sectional view of the components involved in the fifth embodiment of the rotating device according to this application utility model; Figure 21 A cross-sectional view of the components involved in the sixth embodiment of the rotating device according to this application; Figure 22 A top view showing the seventh embodiment of the rotating device according to this utility model application; Figure 23A top view showing the eighth embodiment of the rotating device according to this utility model application; Figure 24 for Figure 23 An exploded perspective view of the rotating device shown. Figure 25 An exploded perspective view showing the ninth embodiment of the rotating device according to this utility model application; Figure 26 To showcase Figure 25 An exploded perspective view of all components of the rotating device shown; Figure 27 A top view showing the tenth embodiment of the rotating device according to this utility model application; Figure 28 for Figure 27 An exploded perspective view of the rotating device shown. Figure 29 A top view showing the eleventh embodiment of the rotating device according to this utility model application; Figure 30 for Figure 29 An exploded perspective view of the rotating device shown. Figure 31 A top view showing the twelfth embodiment of the rotating device according to this utility model application; Figure 32 for Figure 31 An exploded perspective view of the rotating device shown. Detailed Implementation

[0031] according to Figures 1 to 32 The accompanying drawings illustrate the rotating device involved in this utility model application.

[0032] like Figure 1 as well as Figure 2 As shown, in the rotating device according to the first embodiment, the first substrate 10 and the second substrate 70 are supported rotatably about the central axis 20 by a retainer 60 and a rolling element 61 disposed between them.

[0033] like Figure 5 As shown, the first substrate 10 has a planar and approximately square shape, with a central hole 11 that appears square when viewed from above. An annular track groove 12 centered on the central hole 11 is formed on the first substrate 10 by pressure processing. A pair of support holes 13, 13 are provided near the inner peripheral edge of the track groove 12. Elongated mounting holes 14 are formed at each of the four corners of the first substrate 10.

[0034] A central shaft 20 is inserted into the central hole 11 of the first substrate 10. The central shaft 20 has a neck portion 21 with a square cross-section, and an external thread is formed in the shaft portion. The central shaft 20 has a cross-shaped cutting groove on its front end face for riveting and fixing. Moreover, as Figure 3 as well as Figure 4 As shown, a resin cylindrical body 22 is rotatably inserted into the shaft portion of the central shaft 20 protruding from the first substrate 10.

[0035] Support pins 30 and 30, which serve as support bodies, are riveted and fixed to the support holes 13 and 13 of the first substrate 10.

[0036] An annular elastomer 40 is mounted between the cylindrical body 22 and the support pins 30, 30. The annular elastomer 40 is constructed by stacking three annular elastomers 41. Figure 16 as well as Figure 17 As shown, the annular elastic element 41 has a circular cross-section. Of course, the number of annular elastic elements 41 can be appropriately increased or decreased as needed.

[0037] A generally cylindrical drive body 50 is rotatably pressed into the annular elastic body 40. A support shaft 51, described later, is inserted into the drive body 50 and mounted on the inward surface of the second substrate 70. Therefore, when the second substrate 70 rotates, the drive body 50 causes the annular elastic body 40 to elastically deform and rotate around the central axis 20 on the first substrate 10.

[0038] Except for the difference in the position and number of the support holes 73, the second substrate 70 has the same shape as the first substrate 10, and is provided with a central hole 71, a track groove 72, and a mounting hole 74. Furthermore, the central hole 71 of the second substrate 70 is fitted into the central shaft 20 mounted on the first substrate 10, with the upper end of the central shaft 20 protruding from the upper surface of the second substrate 70. A first track plate 80 is assembled at the upper end of the protruding central shaft 20.

[0039] The first track plate 80 is circular in shape when viewed from above, and has a through hole 81 at its center. A track groove 82 is provided around the through hole 81 on the first track plate 80. A plurality of rolling elements 83 are arranged in the track groove 82 in a rolling manner. Furthermore, on the second track plate 84, which is circular in shape when viewed from above and covers the upper surface of the first track plate 80, an internal thread is formed on the inner circumferential surface of the through hole 85 formed by a protruding process. The internal thread can be screwed into the external thread of the central shaft 20.

[0040] Next, the assembly method of the first embodiment will be described.

[0041] The support pins 31, 31 are inserted into the support holes 13, 13 of the first substrate 10 and riveted for fixation. Then, the central shaft 20 is inserted into the square center hole 11 of the first substrate 10 and embedded in the lower neck 21 of the square to prevent rotation and for positioning. After the cylindrical body 22 is fitted into the central shaft 20 protruding from the first substrate 10, an annular elastic body 40 is mounted on the cylindrical body 22 and the two support pins 30, 30. Next, the drive body 50 is pressed into the annular elastic body 40 and positioned. Then, the retainer 60 and the rolling element 61 are assembled into the track groove 12 of the first substrate 10.

[0042] The support shaft 51 is inserted into the support hole 73 of the second substrate 70 and riveted in place. Then, the support shaft 51 is inserted into the through hole of the drive body 50, while the center hole 71 of the second substrate 70 is fitted into the center shaft 20. Thus, as the second substrate 70 rotates, the drive body 50 can rotate around the center shaft 20 while causing the annular elastic body 40 to elastically deform.

[0043] The through hole 81 of the first track plate 80 is fitted into the front end of the central shaft 20, which protrudes from the central hole 71 of the second base plate 70. Then, after arranging a plurality of rolling elements 83 in the track groove 82 of the first track plate 80, the internal thread portion formed on the inner circumferential surface of the through hole 85 of the second track plate 84 is screwed into the external thread portion provided on the shaft portion of the central shaft 20. Furthermore, the rotation of the second base plate 70 is adjusted by adjusting the screwing state of the second track plate 84. Finally, the assembly operation is completed by riveting the cutting groove provided on the front end face of the central shaft 20.

[0044] Next, the operation and actions of the first embodiment will be described.

[0045] like Figure 6 As shown, the central shaft 20, the drive body 50, and a pair of support pins 30, 30 are arranged side by side along the same straight line. Then, as... Figure 7 As shown, if the second substrate 70 is rotated approximately 90 degrees clockwise, the support shaft 51 rotates the drive body 50 around the central axis 20. Therefore, the annular elastic body 40 is stretched and undergoes elastic deformation. In this state, if the load on the second substrate 70 is released, the drive body 50 is pushed back due to the elastic force of the annular elastic body 40, and the second substrate 70 returns to its initial state.

[0046] Furthermore, if the second substrate 70 is rotated 180 degrees clockwise, then as Figure 8 As shown, the support shaft 51 rotates the drive body 50 around the central shaft 20. The drive body 50 and the support pins 30 are arranged side by side on the same straight line across the central shaft 20.

[0047] like Figure 9As shown, the second substrate 70 is rotated 90 degrees counterclockwise from its initial state. If the load on the second substrate 70 is released, the driving body 50 is pushed back due to the elastic force of the annular elastic body 40, returning to the initial state. Thus, the second substrate 70 also returns to its initial state.

[0048] Therefore, according to the first embodiment, the second substrate 70 can be automatically restored to its initial state regardless of whether it is rotated in the clockwise or counterclockwise direction.

[0049] like Figures 10 to 12 As shown, the second embodiment is largely the same as the first embodiment described above, except that it has a limiting body 90.

[0050] The limiting body 90 is formed by a through hole 91 that appears square when viewed from above (see reference). Figure 11 It is inserted into the lower part 21 of the neck, which has a square cross-section, of the central shaft 20 and is assembled in a non-rotatable manner.

[0051] In the first embodiment, such as Figure 10 As shown, when the drive body 50 rotates and reaches the position where the drive body 50 and the support pins 30, 30 are on the same straight line across the central axis 20, a so-called tensioned state will be formed, and the second substrate 70 may not be able to automatically recover.

[0052] However, according to the second embodiment, when the drive body 50 and the support pins 30, 30 are aligned on the same straight line across the central axis 20, the drive body 50 presses against the protrusion 92 of the limiting body 90. Therefore, the limiting body 90 limits the drive body 50 in a manner that causes it to enter an unstable state. As a result, a so-called tensioned state can be avoided, thus ensuring the automatic recovery of the second substrate 70.

[0053] Other aspects are the same as those described above, so the same symbols are used to mark the same parts and the descriptions are omitted.

[0054] like Figures 13 to 15 As shown, the third embodiment is largely the same as the first embodiment described above. The difference lies in the presence of a pin-shaped limiting body 93. The limiting body 93 is riveted and fixed to a support hole 15 located near the center hole 11 of the first substrate 10. Figure 15 As shown, the aforementioned support hole 15 is located on a straight line at the midpoint between the central hole 11 and the support holes 13, 13.

[0055] According to this embodiment, such as Figure 13As shown, when the drive body 50 and the support pins 30, 30 are aligned on the central axis 20, the limiting body 93 presses against the drive body 50. Therefore, the limiting body 93 limits the drive body 50 in a manner that causes it to enter an unstable state. As a result, by avoiding a so-called tension state, it has the effect of ensuring the automatic recovery of the second substrate 70.

[0056] Other aspects are the same as those described above, so the same symbols are used to mark the same parts and the descriptions are omitted.

[0057] like Figure 16 as well as Figure 17 As shown, in the above embodiment, the annular elastic body 40 is constructed by combining annular elastic elements 41 with a circular cross-section. Conversely, it can also be constructed as follows: Figure 18 as well as Figure 19 As shown, a rectangular annular elastomer 40 (fourth embodiment) can also be used, as in... Figure 20 As shown, an annular elastomer 40 with a generally trapezoidal cross-section is used (fifth embodiment). Alternatively, it can be as follows... Figure 21 As shown, there is an annular elastomer 40 with an elliptical cross-section (sixth embodiment).

[0058] like Figure 22 As shown, the seventh embodiment is the case of increasing the spacing between adjacent pairs of support pins 30, 30.

[0059] According to this embodiment, since the spacing between the pair of support pins 30, 30 is widened, it has the advantage that the riveting operation becomes easier.

[0060] Other aspects are the same as those described above, so the same symbols are used to mark the same parts and the descriptions are omitted.

[0061] like Figure 23 as well as Figure 24 As shown, the eighth embodiment is a case of increasing the diameter of a pair of support pins 31, 31.

[0062] According to this embodiment, the curvature of the annular elastomer 40 mounted on the support pins 31, 31 increases. Therefore, it has the advantages of reducing stress concentration on the annular elastomer 40, making it less prone to fatigue failure, and resulting in a rotating device with a long service life.

[0063] Other aspects are the same as those described above, so the same symbols are used to mark the same parts and the descriptions are omitted.

[0064] like Figure 25 As shown in Figure 26, the ninth embodiment is to set the drive body 50 to a large diameter and integrate it with the support pin.

[0065] According to this embodiment, the number of components and assembly time are reduced, productivity is increased, and the annular elastomer 40 is not prone to fatigue failure, resulting in a long-life rotating device.

[0066] Other aspects are the same as those described above, so the same symbols are used to mark the same parts and the descriptions are omitted.

[0067] like Figure 27 as well as Figure 28 As shown, the tenth embodiment is a case where the support pin 31 is set as one piece and is set as a large diameter.

[0068] According to this embodiment, a large-diameter support pin 31 mounted on the first substrate 10 supports the annular elastomer 40. Therefore, it has the advantages of reducing the number of parts / assembly time and increasing productivity.

[0069] In addition, it has the advantages of reducing stress concentration in the annular elastomer 40 and obtaining a rotating device with a long service life.

[0070] Other aspects are the same as those described above, so the same symbols are used to mark the same parts and the descriptions are omitted.

[0071] like Figure 29 as well as Figure 30 As shown, the eleventh embodiment is to have one support pin 30 as the support body, and to fit a large-diameter resin cylindrical body 32 into the support pin 30.

[0072] According to this embodiment, the annular elastomer 40 is mounted via a large-diameter resin cylindrical body 32, thus providing the advantage of a rotating device that operates smoothly and has a long service life.

[0073] Other aspects are the same as those described above, so the same symbols are used to mark the same parts and the descriptions are omitted.

[0074] like Figure 31 as well as Figure 32 As shown, the twelfth embodiment is a case where the support pin 33 is cut and flipped up from the first substrate 10.

[0075] According to this embodiment, it has the advantages of fewer parts, less assembly time, and high productivity of the rotary device.

[0076] Other aspects are the same as those described above, so the same symbols are used to mark the same parts and the descriptions are omitted.

[0077] The various embodiments have been described in detail above with reference to the accompanying drawings. Next, the various forms involved in this utility model will be described. It should be noted that reference numerals are also used in the following description as examples.

[0078] The rotating device according to the first embodiment of this utility model has the following structure: the rotating device includes: 1st substrate 10; A central axis 20 protrudes upward from the upper surface of the first substrate 10; At least one support 30 protrudes upward from the upper surface of the first substrate 10; An annular elastic body 40 is installed between the central shaft 20 and the support 30; A second substrate 70, which is assembled covering the first substrate 10 and rotatably around the central axis 20; and A drive unit 50, disposed within the aforementioned annular elastomer 40, rotating integrally with the aforementioned second substrate 70, and pressing against the aforementioned annular elastomer 40. As the second substrate 70 rotates, the driving body 50 begins to move from its initial state, causing the annular elastic body 40 to undergo elastic deformation. On the other hand, the elastic force of the aforementioned annular elastomer 40, which has undergone elastic deformation, is used to push the aforementioned drive body 50 back to the initial state, thereby restoring the second substrate 70 to the initial state.

[0079] The rotating device of the second embodiment of this utility model has the following structure: In the rotating device of the first embodiment, Between the first substrate 10 and the second substrate 70, a plurality of rolling elements 61 are arranged in a ring around the central axis 20.

[0080] The rotating device of the third aspect of this utility model has the following structure: in the rotating device described in the first or second aspect, One end of an annular elastic body 40 is mounted on a cylindrical body 22 that is rotatably mounted on a central shaft 20.

[0081] The rotating device of the fourth embodiment of this utility model has the following structure: in the rotating devices described in any of the first to third embodiments, The other end of the annular elastic body 40 is mounted on the cylindrical body 32 of the support body 30 in a rotatable manner.

[0082] The rotating device of the fifth embodiment of this utility model has the following structure: in the rotating devices described in any of the first to fourth embodiments... The support body 30 is composed of multiple support pins arranged side by side.

[0083] The rotating device of the sixth embodiment of this utility model has the following structure: in the rotating devices described in any of the first to fourth embodiments, The support body 30 is configured as a support pin 33 formed by cutting and flipping up the first substrate 10.

[0084] The rotating device of the seventh embodiment of this utility model has the following structure: in the rotating devices described in any of the first to sixth embodiments, The annular elastomer 40 is designed to have a circular cross-section.

[0085] The rotating device of the eighth embodiment of this utility model has the following structure: in the rotating devices described in any of the first to sixth embodiments, The annular elastomer 40 is designed with a square cross-section.

[0086] The rotating device of the ninth embodiment of this utility model has the following structure: in the rotating devices described in any of the first to sixth embodiments, The annular elastomer 40 is designed with a trapezoidal cross-section.

[0087] The rotating device of the tenth embodiment of this utility model has the following structure: in the rotating devices described in any of the first to sixth embodiments, The annular elastomer 40 is designed with an elliptical cross-section.

[0088] The rotating device of the 11th embodiment of this utility model has the following structure: In the rotating devices described in any of the 1st to 10th embodiments, A limit body 90 is provided to prevent a jamming state that may occur when the drive body 50 is located on the extension of the straight line connecting the central shaft 20 and the support body 30.

[0089] The rotating device of the 12th embodiment of this utility model has the following structure: In the rotating device of the 11th embodiment, The limiting body 90 is mounted on the central shaft 20 and has a protrusion 92 that presses against the drive body 50 to make it unstable.

[0090] The rotating device of the 13th aspect of this utility model has the following structure: In the rotating device described in the 11th aspect, The limiting body 93 is fixed to the first substrate 10 and has a pin shape that is pressed against the driving body 50 to form an unstable state.

[0091] The chair of the 14th form involved in this utility model application is configured to be equipped with a rotating device described in any of the 1st to 13th forms.

[0092] [Industry availability] According to this embodiment, it can be applied not only to the seat surfaces of household chairs, but also to sofas, office supplies, outdoor products, revolving doors, etc.

[0093] Symbol Explanation 10 1st base board 11. Center Hole 12 track slots 13 Support Holes 14 mounting holes 15 Support Holes 20 Central axis 21 Lower neck 22 Cylindrical body 30 Support body (support pin) 31 Support body (support pin) 32 cylinder 33 Support body (support pin) 40 cyclic elastomer 41 Cyclic elastomers 50 driving units 51 support shaft 60 Retainer 61 Rolling element 70 2nd base plate 71 Center Hole 72 Track groove 73 Support Hole 74 mounting holes 80 First Track Slab 81 Through Hole 82 Track groove 83 Rolling element 84 Second Track Slab 85 Through Hole 90 Limiting Body 91 Through Hole 92. Protrusion 93. Limiting body.

Claims

1. A rotating device, characterized by, The rotating device includes: 1st substrate; A central axis that protrudes upward from the upper surface of the first substrate; At least one support body protrudes upward from the upper surface of the first substrate; A ring-shaped elastomer is disposed between the central shaft and the support body; A second substrate, which covers the first substrate and is rotatably assembled around the central axis; as well as A driving body is disposed within the annular elastic body and rotates integrally with the second substrate to push the annular elastic body. As the second substrate rotates, the driving body begins to move from its initial state, causing the annular elastomer to undergo elastic deformation. On the other hand, the elastic force of the annular elastomer, which has undergone elastic deformation, is used to push the driving body back to the initial state, thereby restoring the second substrate to the initial state.

2. The rotating device as claimed in claim 1, characterized in that, Between the first substrate and the second substrate, a plurality of rolling elements are arranged in a ring around the central axis.

3. The rotating device as described in claim 1, characterized in that, One end of a ring-shaped elastic body is mounted on a cylindrical body that is rotatably mounted on a central shaft.

4. The rotating device as claimed in claim 1, characterized in that, The other end of the cylindrical body, which is rotatably mounted on the support, has an annular elastic body mounted on it.

5. The rotating device as claimed in claim 1, characterized in that, The support consists of multiple support pins arranged side by side.

6. The rotating device as claimed in claim 1, characterized in that, The support body is a support pin formed by cutting and flipping up the first substrate.

7. The rotating device as claimed in claim 1, characterized in that, The annular elastomer has a circular cross-section.

8. The rotating device as claimed in claim 1, characterized in that, The annular elastomer has a square cross-section.

9. The rotating device as claimed in claim 1, characterized in that, The annular elastomer has a trapezoidal cross-section.

10. The rotating device as claimed in claim 1, characterized in that, The annular elastomer has an elliptical cross-section.

11. The rotating device as claimed in claim 1, characterized in that, A limit body is provided to prevent a jamming state that may occur when the drive body is located on the extension line of the straight line connecting the central shaft and the support body.

12. The rotating device as claimed in claim 11, characterized in that, The limiting body is mounted on the central shaft and has a protrusion that presses against the drive body to create an unstable state.

13. The rotating device as claimed in claim 11, characterized in that, The limiting body is fixed to the first substrate and has a pin shape that is pressed against the driving body to form an unstable state.

14. A chair, characterized in that It is assembled with a rotating device as described in any one of claims 1 to 13.

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