Automatic reset turntable

Abstract

The utility model provides an automatic reset rotating disc. The automatic reset rotating disc comprises a first rotating disc, a second rotating disc, a rotating assembly and a reset piece. The first turntable can rotate relative to the second turntable; the rotating assembly comprises a center shaft, an eccentric shaft and an eccentric rotating ring, the center shaft penetrates through the centers of the first rotating disc and the second rotating disc, the center shaft is sleeved with the eccentric shaft, and the center of the eccentric shaft does not coincide with the center of the center shaft; a pull pin is arranged on the eccentric rotating ring, a stroke hole extending in the radial direction is formed in the first rotating disc, and the pull pin penetrates through the stroke hole and extends to the position above the first rotating disc. The pull pin can move in the stroke hole in the length direction of the stroke hole. When the pull pin is located at the position closest to or farthest from the center shaft, the first rotating disc is in an initial state. Therefore, the rotating turntable can be accurately reset to the initial position.

Description

Technical Field

[0001] This utility model relates to the field of turntable technology, and in particular to an automatic reset turntable. Background Technology

[0002] There are chairs on the market that use a turntable to achieve 360-degree rotation of the seat cushion. Chinese invention application (application number: 202410261410.5) proposes an automatically resetting turntable, in which after the second disc rotates relative to the first disc, the second disc can be reset to its initial position by means of the force of a spring.

[0003] However, this implementation method has problems. When the seat rotates and returns to its initial position, the spring continuously does positive work during the process. Near the initial position, the spring's restoring force (the component of the spring force in the circumferential direction) is relatively small, resulting in a faster return speed and continuous periodic oscillations. Furthermore, when the oscillation finally stops, because the system friction cannot be zero, the stopping position is usually not the initial position, but rather the position where the spring's elastic restoring force and the system's static friction reach equilibrium. In reality, the system's static friction is not constant; this position is not fixed near the initial position, leading to inconsistent seat reset positions. When this turntable is used on rows of chairs, such as bar stools, it can easily result in messy seat angle reset positions after customers leave, affecting the cleanliness of the environment.

[0004] Therefore, there are still problems in the existing technology that need to be solved. Utility Model Content

[0005] The main purpose of this invention is to provide an automatic reset turntable, which aims to enable the rotating turntable to accurately reset to its initial position.

[0006] To achieve the above objectives, this utility model proposes an automatic reset turntable, comprising a first turntable, a second turntable, a rotating assembly, and a reset component. The first turntable is rotatable relative to the second turntable. The rotating assembly includes a central shaft, an eccentric shaft, and an eccentric rotating ring. The central shaft passes through the center of the first and second turntables, and the eccentric shaft is sleeved outside the central shaft, with its center not coinciding with the center of the central shaft. The eccentric shaft is circumferentially fixed to the second turntable. The eccentric rotating ring is rotatably disposed outside the eccentric shaft and can rotate around the center of the eccentric shaft. A pull pin is provided on the eccentric rotating ring. The first turntable has a radially extending stroke hole, and the pull pin passes through the stroke hole and extends above the first turntable. The pull pin can move within the stroke hole along its length. The reset component is fixed to the pull pin and applies a reset force to the pull pin in a direction toward or away from the central shaft. When the pull pin is at its closest or farthest position from the central shaft, the first turntable is in its initial state.

[0007] Preferably, the eccentric rotating ring includes a first protrusion that protrudes horizontally away from the center of the ring; a pull pin is disposed on the first protrusion.

[0008] Preferably, a groove is formed in the middle of the first turntable and / or the second turntable; when the first protrusion rotates with the pull pin, the circumference of the first protrusion is located in the groove.

[0009] Preferably, the reset element is a spring, and a fixing part is provided on the first turntable. One end of the spring is fixed to the pull pin, and the other end of the spring is fixed to the fixing part.

[0010] Preferably, a bearing is provided between the eccentric shaft and the eccentric rotating ring.

[0011] Preferably, it also includes a positioning structure, which is disposed at the stroke hole.

[0012] Preferably, the positioning structure is located on the path of the pull pin, and holds the pull pin when it is at its closest or furthest position from the central axis.

[0013] Preferably, the positioning structure is riveted to the first turntable.

[0014] Preferably, the positioning structure is located at the end of the stroke hole near or away from the central shaft and is configured as a positioning clamp, which includes two clamping arms for holding the pull pin.

[0015] Preferably, a second protrusion is formed on the clamping arm, and the second protrusion protrudes toward the other clamping arm.

[0016] The automatic reset turntable provided in this application includes a first turntable, a second turntable, a rotating assembly, and a reset component. The first turntable is rotatable relative to the second turntable. The rotating assembly includes a central shaft, an eccentric shaft, and an eccentric rotating ring. The central shaft passes through the center of the first and second turntables, and the eccentric shaft is sleeved outside the central shaft, with its center not coinciding with the center of the central shaft. The eccentric shaft is circumferentially fixed to the second turntable. The eccentric rotating ring is rotatably disposed outside the eccentric shaft and can rotate around the center of the eccentric shaft. A pull pin is provided on the eccentric rotating ring. The first turntable has a radially extending stroke hole, and the pull pin passes through the stroke hole and extends above the first turntable. The pull pin can move within the stroke hole along its length. The reset component is fixed to the pull pin and applies a reset force to the pull pin in a direction toward or away from the central shaft. When the pull pin is at its closest or farthest position from the central shaft, the first turntable is in its initial state. This allows the rotating turntable to accurately reset to its initial position. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an embodiment of the automatic reset turntable of this utility model;

[0019] Figure 2 This is an exploded view of an embodiment of the automatic reset turntable of this utility model;

[0020] Figure 3 This is a schematic diagram of the first turntable in an embodiment of the automatic reset turntable of this utility model;

[0021] Figure 4 This is a schematic diagram of the positioning structure of an embodiment of the automatic reset turntable of this utility model;

[0022] Figure 5 This is a schematic diagram of the eccentric rotating ring and pull pin of an embodiment of the automatic reset turntable of this utility model;

[0023] Figure 6 This is a schematic diagram of the eccentric shaft of an embodiment of the automatic reset turntable of this utility model;

[0024] Figure 7 This is a schematic diagram of the central shaft of an embodiment of the automatic reset turntable of this utility model.

[0025] Explanation of icon numbers:

[0026] label name label name 100 First turntable 331 first convex part 110 travel hole 400 Reset component 120 Fixing part 500 groove 200 Second turntable 600 bearings 300 Rotating component 700 Positioning structure 310 Central axis 710 clamp arm 320 Eccentric shaft 711 second convex part 330 Eccentric Rotary Ring 800 Pull pin

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] There are chairs on the market that use a turntable to achieve 360-degree rotation of the seat cushion. Chinese invention application (application number: 202410261410.5) proposes an automatically resetting turntable, in which after the second disc rotates relative to the first disc, the second disc can be reset to its initial position by means of the force of a spring.

[0032] However, this implementation method has problems. When the seat rotates and returns to its initial position, the spring continuously does positive work during the process. Near the initial position, the spring's restoring force (the component of the spring force in the circumferential direction) is relatively small, resulting in a faster return speed and continuous periodic oscillations. Furthermore, when the oscillation finally stops, because the system friction cannot be zero, the stopping position is usually not the initial position, but rather the position where the spring's elastic restoring force and the system's static friction reach equilibrium. In reality, the system's static friction is not constant; this position is not fixed near the initial position, leading to inconsistent seat reset positions. When this turntable is used on rows of chairs, such as bar stools, it can easily result in messy seat angle reset positions after customers leave, affecting the cleanliness of the environment.

[0033] To address the aforementioned issues, this patent provides an automatic reset turntable designed to enable the rotating turntable to accurately reset to its initial position.

[0034] For ease of understanding, the specific implementation methods of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0035] Please see Figure 1 , Figure 2 , Figure 3 , Figure 5, Figure 6 and Figure 7 The automatic reset turntable includes a first turntable 100, a second turntable 200, a rotating assembly 300, and a reset component 400. The first turntable 100 is rotatable relative to the second turntable 200. The rotating assembly 300 includes a central shaft 310, an eccentric shaft 320, and an eccentric rotating ring 330. The central shaft 310 passes through the center of the first turntable 100 and the center of the second turntable 200. The eccentric shaft 320 is sleeved outside the central shaft 310, and the center of the eccentric shaft 320 does not coincide with the center of the central shaft 310. The eccentric shaft 320 is circumferentially fixed to the second turntable 200. The eccentric rotating ring 330 is rotatably mounted on the eccentric shaft 320. In addition, it can rotate around the center of the eccentric shaft 320; the eccentric rotating ring 330 is provided with a pull pin 800, the first turntable 100 forms a radially extending stroke hole 110, the pull pin 800 passes through the stroke hole 110 and extends above the first turntable 100; the pull pin 800 can move in the stroke hole 110 along the length direction of the stroke hole 110; the reset member 400 is fixed to the pull pin 800 and applies a reset force to the pull pin 800 in the direction toward or away from the central shaft 310; when the pull pin 800 is at the position closest to or farthest from the central shaft 310, the first turntable 100 is in the initial state. It should be noted that the eccentric rotating ring 330 is rotatably disposed outside the eccentric shaft 320. This can be achieved by either the inner wall of the through hole of the eccentric rotating ring 330 being in contact with the outer wall of the eccentric shaft 320, or by not being in contact with the outer wall of the eccentric shaft 320 (for example, as described later, a bearing 600 is placed between the eccentric rotating ring 330 and the eccentric shaft 320). Similarly, the eccentric shaft 320 is sleeved outside the central shaft 310. This can also be achieved by either the inner wall of the through hole of the eccentric shaft 320 being in contact with the outer wall of the central shaft 310, or by not being in contact with the outer wall of the central shaft 310.

[0036] In this embodiment, the position of the first turntable 100 when the pull pin 800 is at its closest or furthest position from the central axis 310 is set as the initial position; when the position of the first turntable 100 when the pull pin 800 is at its closest position to the central axis 310 is set as the initial position, the reset force provided by the reset member is the force that moves the pull pin 800 closer to the central axis 310; when the position of the first turntable 100 when the pull pin 800 is at its furthest position from the central axis 310 is set as the initial position, the reset force provided by the reset member is the force that moves the pull pin 800 away from the central axis 310. When no force is applied to the first turntable 100, the resetting force applied by the resetting member 400 to the pull pin 800 will cause the pull pin 800 and the eccentric rotating ring 330 to rotate. During the rotation of the pull pin 800, the pull pin 800 moves within the stroke hole 110. During the process of the pull pin 800 moving to the position closest to or farthest from the central axis 310, the sliding friction between the pull pin 800 and the side wall of the stroke hole 110 does negative work. When the mechanical energy of the system is consumed to a certain extent, when the pull pin 800 moves to the position closest to or farthest from the central axis 310 again, the resetting force cannot overcome the friction, and thus the pull pin 800 cannot move within the stroke hole 110. As the pin moves within hole 110, the system's mechanical energy is exhausted, and the first turntable 100 stops rotating along with the pull pin 800. To further enhance the positioning effect, the pin 800 can be positioned at the end of the stroke hole 110 when it reaches its closest or furthest position from the central axis 310. This increases the contact area between the pin 800 and the sidewall of the stroke hole 110 (when the pin 800 is in the middle of the stroke hole 110, it contacts the left and / or right sidewalls; when it is at the end of the stroke hole 110, it contacts the left and / or right sidewalls, as well as the end sidewall). This ensures that the pin 800 consumes more mechanical energy when it is closest or furthest from the central axis 310, facilitating a more accurate return of the rotating turntable to its initial position.

[0037] It should be noted that there are multiple ways to implement the pin 800 on the eccentric rotating ring 330. This embodiment provides the following implementation method; please refer to [link / reference]. Figure 5 The eccentric rotating ring 330 includes a first protrusion 331, which protrudes horizontally away from the ring center. A pull pin 800 is disposed on the first protrusion 331. The stroke of the pull pin 800 is determined by the degree of eccentricity of the eccentric shaft 320; therefore, the farther the pull pin 800 is from the center, the farther its closest point of travel is from the center. This implementation allows the stroke hole 110 adapted to this implementation to be close to the edge of the first turntable 100, increasing the structural strength of the middle part of the first turntable 100.

[0038] Based on the above implementation, to ensure smooth rotation of the first turntable 100, ball bearings are installed between the first turntable 100 and the second turntable 200. This method results in a smaller distance between the first turntable 100 and the second turntable 200. Therefore, there is a problem of how to make the first protrusion 331 rotate between the first turntable 100 and the second turntable 200. To solve the above problem, this embodiment provides the following implementation method. Please refer to [link / reference]. Figure 2 A groove 500 is formed in the middle of the first turntable 100 and / or the second turntable 200; when the first protrusion 331 rotates with the pull pin 800, the rotation circumference of the first protrusion 331 is located within the groove 500. This implementation ensures that the rotation circumference of the first protrusion 331 (i.e., the movement trajectory of the first protrusion 331) is located within the groove 500, so that it will not be disturbed when rotating.

[0039] It should be noted that the reset component 400 can be implemented in various ways. This embodiment provides the following implementation method. Please refer to [link / reference]. Figure 1 The reset component 400 is configured as a spring, and a fixing part 120 is provided on the first turntable 100. One end of the spring is fixed to the pull pin 800, and the other end of the spring is fixed to the fixing part 120.

[0040] It should be noted that, in order to make the rotation of the first turntable 100 smoother, this embodiment provides the following implementation method, please refer to [link / reference]. Figure 2 A bearing 600 is provided between the eccentric shaft 320 and the eccentric rotating ring 330. This implementation reduces the sliding friction force on the eccentric rotating ring 330, making the rotation of the eccentric rotating ring 330 smoother. Consequently, the first turntable 100 also rotates more smoothly with the pull pin 800 provided on the eccentric rotating ring 330.

[0041] It should be noted that, in order to further ensure that the turntable can be accurately reset to its initial position, this embodiment provides the following implementation method, please refer to [link / reference]. Figure 1 and Figure 2 It also includes a positioning structure 700, which is disposed at the stroke hole 110. The positioning structure 700 can position the pull pin 800 when the first turntable 100 is reset to the initial position.

[0042] Based on the above implementation methods, the positioning structure 700 has multiple implementation methods. This embodiment provides the following two implementation methods. Method 1, please refer to... Figure 1-3The positioning structure 700 is located at the end of the travel hole 110 near or far from the central axis 310 and is configured as a positioning clamp. The positioning clamp includes two clamping arms 710 for holding the pull pin. This method effectively enhances the positioning effect of the pull pin 800 when the pull pin 800 is at the end of the travel hole 110 and the first turntable 100 is in its initial position, thus achieving accurate resetting of the first turntable 100. Alternatively, the positioning structure 700 is located on the path of the pull pin 800 and holds the pull pin 800 when it is at its closest or furthest position from the central axis 310. Compared to Method 1, this implementation method not only effectively enhances the positioning effect of the pull pin 800 to achieve accurate reset of the first turntable 100, but also decelerates the pull pin 800 as it moves to the closest or furthest position from the central axis 310 (for example, if the positioning structure 700 is set as a spring, the first contact of the pull pin 800 with the spring during the reset process will decelerate the pull pin 800, and the second contact with the spring will hold it in place).

[0043] For further information regarding method one above, please refer to [link / reference]. Figure 4 A second protrusion 711 is formed on the clamping arm 710, and the second protrusion 711 protrudes toward the other clamping arm 710. This implementation makes it difficult for the pull pin 800 located between the two clamping arms 710 to fall off, and further ensures that the pull pin 800 will not rotate without any human intervention.

[0044] It should be noted that there are multiple ways to implement the positioning structure 700 at the position closest to the central axis 310 in the stroke hole 110. This embodiment provides the following implementation methods, please refer to [link / reference]. Figure 1 and Figure 4 The positioning structure 700 is riveted to the first turntable 100.

[0045] In summary, the automatic reset turntable provided in this application embodiment includes a first turntable 100, a second turntable 200, a rotating assembly 300, and a reset component 400; the first turntable 100 can rotate relative to the second turntable 200; the rotating assembly 300 includes a central shaft 310, an eccentric shaft 320, and an eccentric rotating ring 330, the central shaft 310 passing through the center of the first turntable 100 and the second turntable 200, the eccentric shaft 320 being sleeved outside the central shaft 310, and the center of the eccentric shaft 320 not coinciding with the center of the central shaft 310; the eccentric shaft 320 is circumferentially fixed to the second turntable 200; the eccentric rotating ring 330 is rotatably designed... The first turntable 100 is positioned outside the eccentric shaft 320 and can rotate around the center of the eccentric shaft 320. A pull pin 800 is provided on the eccentric rotating ring 330. The first turntable 100 has a radially extending stroke hole 110. The pull pin 800 passes through the stroke hole 110 and extends above the first turntable 100. The pull pin 800 can move within the stroke hole 110 along its length. A reset member 400 is fixed to the pull pin 800 and applies a reset force to the pull pin 800 in a direction toward or away from the central shaft 310. When the pull pin 800 is at its closest or farthest position from the central shaft 310, the first turntable 100 is in its initial state. This allows the rotating turntable to be accurately reset to its initial position.

[0046] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An auto-return turntable, characterized by, It includes a first turntable, a second turntable, a rotating assembly, and a reset component; the first turntable is rotatable relative to the second turntable; The rotating assembly includes a central shaft, an eccentric shaft, and an eccentric rotating ring. The central shaft passes through the center of the first turntable and the second turntable. The eccentric shaft is sleeved outside the central shaft, and the center of the eccentric shaft does not coincide with the center of the central shaft. The eccentric shaft is circumferentially fixed to the second turntable. The eccentric rotating ring is rotatably disposed outside the eccentric shaft and can rotate around the center of the eccentric shaft; the eccentric rotating ring is provided with a pull pin, the first turntable is formed with a radially extending stroke hole, the pull pin passes through the stroke hole and extends above the first turntable; the pull pin can move within the stroke hole along the length direction of the stroke hole; The reset element is fixed to the pull pin and applies a reset force to the pull pin in a direction toward or away from the central axis; When the pull pin is located at its closest or furthest position from the central axis, the first turntable is in its initial state.

2. The self-resetting carousel of claim 1, wherein, The eccentric rotating ring includes a first protrusion that protrudes horizontally away from the center of the ring. The pull pin is disposed on the first protrusion.

3. An automatically resetting turntable as claimed in claim 2, characterized in that A groove is formed in the middle of the first turntable and / or the second turntable; When the first protrusion rotates with the pull pin, the circumference of the first protrusion is located within the groove.

4. The self-resetting carousel of claim 1, wherein, The reset component is a spring, and a fixing part is provided on the first turntable. One end of the spring is fixed to the pull pin, and the other end of the spring is fixed to the fixing part.

5. The automatic reset turntable as described in claim 1, characterized in that, A bearing is provided between the eccentric shaft and the eccentric rotating ring.

6. An automatically resetting carousel as claimed in any one of claims 1 to 5, characterized in that, It also includes a positioning structure, which is disposed at the stroke hole.

7. An automatically resetting turntable as claimed in claim 6, characterized in that The positioning structure is disposed on the path of the pull pin, and holds the pull pin in place when the pull pin is at its closest or furthest position from the central axis.

8. The self-resetting carousel of claim 6, wherein, The positioning structure is riveted to the first turntable.

9. The self-righting carousel of claim 6, wherein, The positioning structure is located at the end of the stroke hole near or away from the central shaft and is configured as a positioning clamp, the positioning clamp including two clamping arms for clamping the pull pin.

10. An automatically resetting carousel as claimed in claim 9, characterized in that, A second protrusion is formed on the clamping arm, and the second protrusion protrudes toward the other clamping arm.

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