Rotating device and chair using the same

Abstract

The object of this invention is to provide a thin rotating device and a chair using the same. [Solution] The device comprises a first substrate 10, a central shaft 20 protruding upward from the upper surface of the first substrate 10, at least one support 30 protruding upward from the upper surface of the first substrate 10, an annular elastic body 40 spanning the central shaft 20 and the support 30, a second substrate 70 covering the first substrate 10 and rotatably mounted around the central shaft 20, and a drive body 50 disposed within the annular elastic body 40 and rotating integrally with the first substrate 10 to press the annular elastic body 40. A rotating device in which, as the second substrate 70 rotates, the drive unit 50 is displaced from its initial state, causing the annular elastic body 40 to elastically deform, while the spring force of the elastically deformed annular elastic body 40 pushes the drive unit 50 back to its initial state, thereby returning the second substrate 70 to its initial state.

Description

Technical Field

[0001] The present invention relates to a rotating device, particularly a rotating device having a function of automatically returning to an initial state.

Background Art

[0002] Conventionally, as a rotating device, for example, a support shaft having a seat portion connected to the upper end is rotatably and vertically movably attached to a shaft cylinder placed on a floor or a pedestal, and a protrusion eccentrically provided at the lower end of the support shaft is placed on an eccentric upper surface of a rotating stage that is obliquely provided and inclined to rotate within the shaft cylinder (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the support structure of the rotating chair has a problem that the height dimension in the axial direction is large and a thin rotating device cannot be obtained. In view of the above problems, an object of the present invention is to provide a thin rotating device.

Means for Solving the Problems

[0005] The rotating device according to the present invention is to solve the above problems, a first substrate, a central shaft protruding upward from the upper surface of the first substrate, at least one support body protruding upward from the upper surface of the first substrate, an annular elastic body bridged between the central shaft and the support body, a second substrate covering the first substrate and assembled to be rotatable about the central shaft, The device comprises a drive body disposed within the annular elastic body and rotating integrally with the first substrate to press against the annular elastic body, As the second substrate rotates, the drive body is displaced from its initial state, causing the annular elastic body to undergo elastic deformation, The spring force of the elastically deformed annular elastic body pushes the drive body back to its initial state, thereby restoring the second substrate to its initial state. [Effects of the Invention]

[0006] According to the present invention, a drive mechanism for automatically returning the second substrate to its initial state is installed on the first substrate. As a result, the entire rotating device has a flattened structure, and a thin rotating device can be obtained. In particular, this method provides the advantage of creating a thin rotating device that automatically returns to its initial state regardless of whether it is rotated 360 degrees in a clockwise or counterclockwise direction.

[0007] In one embodiment of the present invention, a plurality of rolling elements may be arranged in a ring shape between the first substrate and the second substrate, with respect to a central axis. According to this embodiment, the rotation of multiple rolling elements reduces the coefficient of friction between the first substrate and the second substrate, resulting in a rotating device that performs smooth rotational operation.

[0008] In another embodiment of the present invention, one end of an annular elastic body may be stretched across a cylindrical body that is rotatably mounted on a central axis. According to this embodiment, the annular elastic body is supported via a cylindrical body mounted on the central axis. As a result, the curvature of the annular elastic body is reduced, stress concentration is less likely to occur, and a rotating device with a long lifespan can be obtained.

[0009] In another embodiment of the present invention, the other end of an annular elastic body may be stretched across a cylindrical body that is rotatably mounted on a support. According to this embodiment, the annular elastic body is supported via a cylindrical body attached to a support. As a result, the curvature of the annular elastic body is reduced, stress concentration is less likely to occur, and a rotating device with a long lifespan can be obtained.

[0010] In a different embodiment of the present invention, the support may consist of a plurality of support pins arranged in parallel. According to this embodiment, the curvature of the annular elastic body stretched across multiple support pins is reduced, stress concentration is less likely to occur, and a rotating device with a longer lifespan can be obtained.

[0011] In a different embodiment of the present invention, the support may be a support pin formed by cutting and bending the first substrate. According to this embodiment, the number of parts and assembly steps are reduced, improving productivity.

[0012] In different embodiments of the present invention, the annular elastic body may have a circular cross-section, or it may have a rectangular cross-section.

[0013] Furthermore, the annular elastic body may have a trapezoidal cross-section, or it may have an elliptical cross-section. According to these embodiments, a rotating device that performs the desired rotational movement can be obtained by selecting an annular elastic body as needed.

[0014] In a different embodiment of the present invention, a position regulating body may be provided to avoid a locking condition that may occur when the drive body is located on the extension of the straight line connecting the central axis and the support body. According to this embodiment, a thin rotating device is obtained that does not risk becoming stiff when rotated 360 degrees in either a clockwise or counterclockwise direction, and that automatically returns to its initial state.

[0015] In a different embodiment of the present invention, the position regulating body may have a projection that is attached to the central axis and presses against the drive body to cause it to be in an unstable state. According to this embodiment, a rotating device that is easy to assemble can be obtained because it is mounted on the central axis.

[0016] In a different embodiment of the present invention, the position regulating body may have a pin shape that is fixed to the first substrate and presses against the drive body to create an unstable state. According to this embodiment, a rotating device that can ensure stable operation can be obtained by being fixed to the first substrate.

[0017] As a chair according to the present invention, there is a chair incorporating any of the rotating devices of the above-described embodiments. According to the present invention, for example, by applying it to the seat surface of a chair, there is an effect that a chair having a seat surface with a non-bulky thickness dimension can be obtained.

Brief Description of the Drawings

[0018] [Figure 1] It is a perspective view showing a first embodiment of a rotating device according to the present invention. [Figure 2] It is an exploded perspective view of the rotating device illustrated in FIG. 1. [Figure 3] It is a partial cross-sectional view taken along line III-III of the rotating device illustrated in FIG. 1. [Figure 4] It is another exploded perspective view of FIG. 1. [Figure 5] It is another exploded perspective view of FIG. 1. [Figure 6] It is a plan view showing the initial state of the rotating device according to FIG. 1. [Figure 7] It is a plan view showing the operation in the clockwise direction (90 degrees) of the rotating device according to FIG. 1. [Figure 8] It is a plan view showing the operation in the clockwise direction (180 degrees) of the rotating device according to FIG. 1. [Figure 9] It is a plan view showing the operation in the counterclockwise direction (90 degrees) of the rotating device according to FIG. 1. [Figure 10] It is a plan view showing a second embodiment of a rotating device according to the present invention. [Figure 11] It is a perspective view of the parts according to the second embodiment. [Figure 12] It is an exploded perspective view of the rotating device illustrated in FIG. 10. [Figure 13] It is a plan view showing a third embodiment of a rotating device according to the present invention. [Figure 14]Figure 13 is a perspective view of the components related to the rotating device shown. [Figure 15] Figure 13 is an exploded perspective view of the rotating device shown. [Figure 16] Figure 2 is a plan view showing the components of the rotating device according to the first embodiment. [Figure 17] Figure 16 is a cross-sectional view of the component shown along line XVII-XVII. [Figure 18] This is a perspective view showing a component according to a fourth embodiment of the rotating device of the present invention. [Figure 19] Figure 18 is a cross-sectional view of the component shown along the line XIX-XIX. [Figure 20] This is a cross-sectional view showing a component according to a fifth embodiment of the rotating device of the present invention. [Figure 21] This is a cross-sectional view showing a component according to the sixth embodiment of the rotating device of the present invention. [Figure 22] This is a plan view showing a seventh embodiment of the rotating device according to the present invention. [Figure 23] This is a plan view showing an eighth embodiment of the rotating device according to the present invention. [Figure 24] Figure 23 is an exploded perspective view of the rotating device shown. [Figure 25] This is an exploded perspective view showing a ninth embodiment of the rotating device according to the present invention. [Figure 26] Figure 25 is an exploded perspective view showing all the components related to the rotating device illustrated. [Figure 27] This is a plan view showing a tenth embodiment of the rotating device according to the present invention. [Figure 28] Figure 27 is an exploded perspective view of the rotating device shown. [Figure 29] This is a plan view showing the eleventh embodiment of the rotating device according to the present invention. [Figure 30] Figure 29 is an exploded perspective view of the rotating device shown. [Figure 31] This is a plan view showing a twelfth embodiment of the rotating device according to the present invention. [Figure 32] Figure 31 is an exploded perspective view of the rotating device shown. [Modes for carrying out the invention]

[0019] The rotating device according to the present invention will be described with reference to the attached drawings, Figures 1 to 32. As shown in Figures 1 and 2, the rotating device according to the first embodiment is supported such that the first substrate 10 and the second substrate 70 are rotatably supported around a central axis 20 via a retainer 60 and rolling elements 61 positioned between them.

[0020] As shown in Figure 5, the first substrate 10 has a substantially square shape in plan view and a central hole 11 that is square in plan view at its center. The first substrate 10 has an annular raceway groove 12 formed by press working, centered on the central hole 11. A pair of support holes 13, 13 are provided near the inner peripheral edge of the raceway groove 12. Elongated mounting holes 14 are formed at each of the four corners of the first substrate 10.

[0021] A central shaft 20 is inserted through the central hole 11 of the first substrate 10. The central shaft 20 has a neck portion 21 with a square cross-section, and a male threaded portion is formed on its shaft. The central shaft 20 has a cross-shaped groove on its tip surface for crimping and fixing. As shown in Figures 3 and 4, a resin cylindrical body 22 is rotatably inserted through the shaft portion of the central shaft 20 that protrudes from the first substrate 10.

[0022] Support pins 30, 30, which serve as support structures, are crimped and fixed to the support holes 13, 13 of the first substrate 10, respectively.

[0023] An annular elastic body 40 is stretched between the cylindrical body 22 and the support pins 30, 30. The annular elastic body 40 is constructed by stacking three annular elastic elements 41. As shown in Figures 16 and 17, the annular elastic elements 41 have a circular cross-section. Of course, the number of annular elastic elements 41 in the annular elastic body 40 can be increased or decreased as needed.

[0024] A substantially cylindrical drive unit 50 is rotatably press-fitted into the annular elastic body 40. A support shaft 51, described later, which is attached to the inward-facing surface of the second substrate 70, is inserted into the drive unit 50. Therefore, when the second substrate 70 rotates, the drive unit 50 rotates on the first substrate 10 around the central axis 20, while elastically deforming the annular elastic body 40.

[0025] The second substrate 70 has the same shape as the first substrate 10, except that the position and number of support holes 73 are different, and is provided with a central hole 71, a raceway groove 72, and mounting holes 74. By fitting the central hole 71 of the second substrate 70 onto the central shaft 20 attached to the first substrate 10, the upper end of the central shaft 20 protrudes from the upper surface of the second substrate 70. The first raceway plate 80 is assembled to the protruding upper end of the central shaft 20.

[0026] The first raceway plate 80 is circular in shape when viewed from above and has a through hole 81 at its center. The first raceway plate 80 has a raceway groove 82 around the through hole 81. Multiple rolling elements 83 are arranged to roll freely in the raceway groove 82. The second raceway plate 84, which is circular in shape when viewed from above and can cover the upper surface of the first raceway plate 80, has a female thread formed on the inner surface of a through hole 85 formed by protrusion machining. The female thread can be screwed into the male thread of the central shaft 20.

[0027] Next, the assembly method of the first embodiment will be described. Support pins 31, 31 are inserted into the support holes 13, 13 of the first substrate 10 and crimped into place. Then, the central shaft 20 is inserted into the square central hole 11 of the first substrate 10 and the square neck portion 21 is fitted into place to prevent rotation and position it. After fitting the cylindrical body 22 onto the central shaft 20 protruding from the first substrate 10, the annular elastic body 40 is placed across the cylindrical body 22 and the two support pins 30, 30. Next, the drive body 50 is press-fitted into the annular elastic body 40 and positioned. Finally, the retainer 60 and rolling elements 61 are assembled into the raceway groove 12 of the first substrate 10.

[0028] The support shaft 51 is inserted into the support hole 73 of the second substrate 70 and crimped into place. Then, the support shaft 51 is inserted into the through hole of the drive unit 50, and the central hole 71 of the second substrate 70 is fitted onto the central shaft 20. As a result, the drive unit 50 can rotate around the central shaft 20 while elastically deforming the annular elastic body 40 as the second substrate 70 rotates.

[0029] The tip of the central shaft 20, which protrudes from the central hole 71 of the second substrate 70, is fitted into the through hole 81 of the first raceway plate 80. Then, after arranging multiple rolling elements 83 in the raceway groove 82 of the first raceway plate 80, the female thread formed on the inner surface of the through hole 85 of the second raceway plate 84 is screwed into the male thread provided on the shaft of the central shaft 20. Furthermore, the degree of rotation of the second substrate 70 is adjusted by adjusting the screwed state of the second raceway plate 84. Finally, the assembly work is completed by crimping the split groove provided on the tip surface of the central shaft 20.

[0030] Next, the operation and behavior of the first embodiment will be described. As shown in Figure 6, the central axis 20, the drive unit 50, and a pair of support pins 30, 30 are arranged side by side along the same straight line. Then, as shown in Figure 7, when the second substrate 70 is rotated approximately 90 degrees clockwise, the support shaft 51 rotates the drive unit 50 around the central axis 20. As a result, the annular elastic body 40 is stretched and elastically deformed. When the load on the second substrate 70 is released in this state, the spring force of the annular elastic body 40 pushes the drive unit 50 back, and the second substrate 70 returns to its initial state.

[0031] Furthermore, when the second substrate 70 is rotated 180 degrees clockwise, as shown in Figure 8, the support shaft 51 rotates the drive unit 50 around the central axis 20, and the drive unit 50 and the support pins 30, 30 are aligned on the same straight line with respect to the central axis 20.

[0032] As shown in Figure 9, when the second substrate 70 is rotated 90 degrees counterclockwise from its initial state, and the load on the second substrate 70 is released, the drive unit 50 is pushed back by the spring force of the annular elastic body 40, returning to its initial state, and consequently the second substrate 70 also returns to its initial state.

[0033] Therefore, according to the first embodiment, the second substrate 70 can be automatically returned to its initial state regardless of whether it is rotated clockwise or counterclockwise.

[0034] The second embodiment, as shown in Figures 10 to 12, is substantially the same as the first embodiment described above, the only difference being the addition of a position restrictor 90. The position regulating body 90 is assembled so as not to rotate by inserting a through hole 91 (see Figure 11), which is square in plan view, into the lower neck portion 21 of the central axis 20, which has a square cross-section. In the first embodiment, as shown in Figure 10, when the drive unit 50 rotates and the drive unit 50 and the support pins 30, 30 reach a position on the same straight line with respect to the central axis 20, a so-called tensioned state occurs, and there is a risk that the second substrate 70 will not be able to return to its original position automatically. However, according to the second embodiment, when the drive unit 50 and the support pins 30, 30 reach a position on the same straight line with respect to the central axis 20, the drive unit 50 presses against the projection 92 of the position restricting body 90. As a result, the position restricting body 50 restricts its position in an unstable state. This has the advantage of avoiding the occurrence of a so-called bracing state and ensuring the automatic return of the second substrate 70. Since the rest is the same as the embodiment described above, the same numbers are assigned to the same parts and their explanations are omitted.

[0035] The third embodiment is substantially the same as the first embodiment described above, as shown in Figures 13 to 15. The difference is the addition of a pin-shaped position regulating body 93. The position regulating body 93 is crimped and fixed to a support hole 15 provided near the central hole 11 of the first substrate 10. As shown in Figure 15, the support hole 15 is provided on a straight line connecting the central hole 11 and the intermediate position between the support holes 13, 13. According to this embodiment, as shown in Figure 13, when the drive unit 50 and the support pins 30, 30 reach the same straight line with respect to the central axis 20, the position regulating body 93 presses against the drive unit 50. As a result, the position regulating body 90 restricts the position of the drive unit 50 so that it is in an unstable state. This has the effect of ensuring the automatic return of the second substrate 70 by avoiding the occurrence of a so-called bracing state. Since the rest is the same as the embodiment described above, the same numbers are assigned to the same parts and their explanations are omitted.

[0036] In the embodiments described above, as shown in Figures 16 and 17, the annular elastic body 40 is constructed by combining annular elastic elements 41 with a circular cross-section. However, as shown in Figures 18 and 19, an annular elastic body 40 with a rectangular cross-section (fourth embodiment) may be used, or an annular elastic body 40 with a substantially trapezoidal cross-section (fifth embodiment) may be used, as shown in Figure 20. Furthermore, as shown in Figure 21, an annular elastic body 40 with an elliptical cross-section (sixth embodiment) may also be used.

[0037] The seventh embodiment, as shown in Figure 22, is a case in which the distance between adjacent pairs of support pins 30, 30 is increased. According to this embodiment, the wider spacing between the pair of support pins 30, 30 has the advantage of making the crimping process easier. Since the rest is the same as the embodiment described above, the same numbers are assigned to the same parts and their explanations are omitted.

[0038] The eighth embodiment is one in which the diameter of the pair of support pins 31, 31 is increased, as shown in Figures 23 and 24. According to this embodiment, the distance between the pair of support pins 31, 31 is increased, and the curvature of the annular elastic body 40 spanning the support pins 31, 31 becomes larger. As a result, stress concentration on the annular elastic body 40 is reduced, making it less susceptible to fatigue failure, and providing the advantage of a rotating device with a longer lifespan. Since the rest is the same as the embodiment described above, the same numbers are assigned to the same parts and their explanations are omitted.

[0039] The ninth embodiment, as shown in Figures 25 and 26, is a case in which the drive unit 50 is made larger in diameter and integrated with the support pin. According to this embodiment, the number of parts and assembly steps are reduced, improving productivity, and the annular elastic body 40 becomes less susceptible to fatigue failure, resulting in a rotating device with a longer lifespan. Since the rest is the same as the embodiment described above, the same numbers are assigned to the same parts and their explanations are omitted.

[0040] The tenth embodiment, as shown in Figures 27 and 28, is a case in which the support pin 31 is made into a single, large-diameter pin. In this embodiment, a single large-diameter support pin 31 attached to the first substrate 10 supports the annular elastic body 40. This has the advantage of reducing the number of parts and assembly steps, thereby increasing productivity. Furthermore, this reduces stress concentration on the annular elastic body 40, resulting in a rotating device with a longer lifespan. Since the rest is the same as the embodiment described above, the same numbers are assigned to the same parts and their explanations are omitted.

[0041] The 11th embodiment, as shown in Figures 29 and 30, is a case in which the support pin 30, which is the support body, is made into one, and a large-diameter resin cylindrical body 32 is fitted onto the support pin 30. According to this embodiment, since the annular elastic body 40 is spanned via a large-diameter resin cylindrical body 32, there is an advantage in obtaining a rotating device that operates smoothly and has a long lifespan. Since the rest is the same as the embodiment described above, the same numbers are assigned to the same parts and their explanations are omitted.

[0042] The twelfth embodiment is one in which the support pin 33 is cut and bent from the first substrate 10, as shown in Figures 31 and 32. According to this embodiment, there is an advantage in that a rotating device can be obtained with fewer parts, fewer assembly steps, and higher productivity. Since the rest is the same as the embodiment described above, the same numbers are assigned to the same parts and their explanations are omitted.

[0043] Having described various embodiments in detail above with reference to the drawings, various aspects of the present invention will now be described. In the following description, reference numerals will also be included as examples.

[0044] The rotating device according to the first embodiment of the present invention is First substrate 10 and A central shaft 20 protruding upward from the upper surface of the first substrate 10, At least one support 30 protruding upward from the upper surface of the first substrate 10, An annular elastic body 40 is stretched between the central axis 20 and the support body 30, A second substrate 70 covers the first substrate 10 and is assembled so as to be rotatable about the central axis 20, The device comprises a drive body 50 disposed within the annular elastic body 40 and rotating integrally with the first substrate 10 to press against the annular elastic body 40, As the second substrate 70 rotates, the drive unit 50 is displaced from its initial state, causing the annular elastic body 40 to elastically deform, The spring force of the elastically deformed annular elastic body 40 pushes the drive body 50 back to its initial state, thereby restoring the second substrate 70 to its initial state.

[0045] The second aspect of the present invention is a rotating device in the first aspect of the rotating device, The configuration involves arranging multiple rolling elements 61 in a ring shape between the first substrate 10 and the second substrate 70, with a central axis 20 at the center.

[0046] The third aspect of the present invention is a rotating device described in the first or second aspect, The configuration involves a cylindrical body 22 that is rotatably mounted on a central axis 20, with one end of an annular elastic body 40 spanning across it.

[0047] The fourth aspect of the present invention is a rotating device described in any one of the first to third aspects, The configuration involves a cylindrical body 32 that is rotatably mounted on a support 30, with the other end of an annular elastic body 40 spanning across it.

[0048] The fifth aspect of the present invention is a rotating device described in any one of the first to fourth aspects, The support 30 is configured as a plurality of support pins arranged in parallel.

[0049] The sixth aspect of the present invention is a rotating device described in any one of the first to fourth aspects, The support 30 is configured as support pins 33 formed by cutting and bending the first substrate 10.

[0050] The seventh aspect of the present invention is a rotating device described in any one of the first to sixth aspects, The annular elastic body 40 is configured with a circular cross-section.

[0051] The eighth aspect of the present invention is a rotating device described in any one of the first to sixth aspects, The annular elastic body 40 is configured with a rectangular cross-section.

[0052] The ninth aspect of the present invention is a rotating device described in any one of the first to sixth aspects, The annular elastic body 40 has a trapezoidal cross-section.

[0053] The rotating device of the tenth aspect of the present invention is a rotating device described in any one of the first to sixth aspects, The annular elastic body 40 has an elliptical cross-section.

[0054] The 11th aspect of the present invention is a rotating device described in any one of the 1st to 10th aspects, The configuration includes a position restrictor 90 to avoid a locking condition that may occur when the drive unit 50 is positioned on the extension of the straight line connecting the central axis 20 and the support unit 30.

[0055] The rotating device of the 12th embodiment of the present invention is, in the rotating device of the 11th embodiment, The position regulating body 90 is attached to the central shaft 20 and has a projection 92 that presses against the drive body 50 to create an unstable state.

[0056] The rotating device of the 13th aspect of the present invention is a rotating device described in the 11th aspect, The position regulating body 93 is fixed to the first substrate and has a pin shape that presses against the drive body, creating an unstable state.

[0057] The chair according to the 14th embodiment of the present invention is The configuration incorporates a rotating device described in any one of the first to thirteenth embodiments. [Industrial applicability]

[0058] According to this embodiment, it can be applied not only to the seat of a living room chair, for example, but also to sofas, office supplies, outdoor equipment, revolving doors, and the like. [Explanation of Symbols]

[0059] 10. First board 11 Center hole 12 Raceway groove 13 Support hole 14 mounting holes 15 Support hole 20 center axis 21 Lower neck 22 Cylindrical body 30 Support (support pins) 31 Support (support pin) 32 Cylindrical body 33 Support (support pin) 40 Annular elastic body 41 Annular elastic element 50 Drive unit 51 Spindle 60 Retainer 61 Rolling element 70 Second board 71 Center hole 72 Raceway groove 73 Support hole 74 mounting holes 80 1st raceway plate 81 Through hole 82 Raceway groove 83 Rolling element 84 2nd raceway plate 85 Through hole 90 Position Regulator 91 Through hole 92 Protrusion 93 Position Regulator

Claims

1. First circuit board and 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 stretched between the central axis and the support, A second substrate covering the first substrate and mounted so as to be rotatable about the central axis, The device comprises a drive body disposed within the annular elastic body and rotating integrally with the first substrate to press against the annular elastic body, As the second substrate rotates, the drive body is displaced from its initial state, causing the annular elastic body to undergo elastic deformation, A rotating device characterized by using the spring force of the elastically deformed annular elastic body to push the drive body back to its initial state, thereby restoring the second substrate to its initial state.

2. The rotating device according to claim 1, characterized in that a plurality of rolling elements are arranged in a ring shape between the first substrate and the second substrate, with respect to a central axis.

3. The rotating device according to claim 1, characterized in that one end of an annular elastic body is stretched across a cylindrical body that is rotatably mounted on a central axis.

4. The rotating device according to claim 1, characterized in that the other end of an annular elastic body is stretched across a cylindrical body that is rotatably mounted on a support.

5. The rotating device according to claim 1, characterized in that the support is a plurality of parallel support pins.

6. The rotating device according to claim 1, characterized in that the support is a support pin formed by cutting and bending a first substrate.

7. The rotating device according to claim 1, characterized in that the annular elastic body has a circular cross-section.

8. The rotating device according to claim 1, characterized in that the annular elastic body has a rectangular cross-section.

9. The rotating device according to claim 1, characterized in that the annular elastic body has a trapezoidal cross-section.

10. The rotating device according to claim 1, characterized in that the annular elastic body has an elliptical cross-section.

11. The rotating device according to claim 1, characterized in that it is provided with a position regulating body to avoid a locking state that may occur when the drive body is positioned on the extension of the straight line connecting the central axis and the support body.

12. The rotating device according to claim 11, characterized in that the position regulating body is attached to the central axis and has a projection that presses against the drive body to cause it to be in an unstable state.

13. The rotating device according to claim 11, characterized in that the position regulating body is fixed to the first substrate and has a pin shape that presses against the drive body to create an unstable state.

14. A chair characterized by incorporating a rotating device as described in any one of claims 1 to 13.

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