Base for computer gateway

Abstract

The utility model discloses a base for a computer gateway, which comprises a bottom plate, a space adjusting mechanism, a position fixing mechanism and a dismounting auxiliary mechanism, and is characterized in that the space adjusting mechanism comprises a driving motor, a rotating plate, a supporting plate, a rotating shaft, a mounting frame, a longitudinal groove and an adjusting hole; the position fixing mechanism comprises a clamping pipe, a clamping rod, an outward-extending spring, an outward-extending rod, an inner pressing ring and a clamping slope, the rotating shaft is driven by the driving motor to rotate, so that the mounting frame slides in the longitudinal groove in the longitudinal direction, the position and spatial configuration of equipment can be accurately adjusted, and different mounting requirements are met; the mounting frame can be effectively fixed in the longitudinal groove, accidental displacement of the mounting frame in the adjusting process is avoided, and therefore equipment stability is guaranteed, the position fixing mechanism enables the fixing position of the mounting frame to be accurately adjusted through the design of multiple sets of adjusting holes, and different application requirements are met.

Description

Technical Field

[0001] This utility model relates to the field of gateway installation technology, and more specifically, it relates to a base for a computer gateway. Background Technology

[0002] In existing computer gateway technologies, gateway components are typically mounted on a fixed base to ensure stable operation of the device.

[0003] Existing computer gateway bases are typically designed with a fixed installation structure, meaning the installation position of the gateway components is predetermined and cannot be flexibly adjusted according to actual needs. The optimal installation position for gateway components may vary in different application environments. For example, in data centers, industrial control systems, or smart home environments, the gateway's position may need to be adjusted based on heat dissipation requirements, signal coverage, or cabling conditions. However, due to the lack of space adjustment capabilities, gateway components cannot be moved longitudinally or laterally, nor can their angle be adjusted, limiting their adaptability. Gateway components typically generate heat; if their spatial position cannot be adjusted, they may be too close to other devices or installed in poorly ventilated locations, leading to reduced heat dissipation efficiency and consequently affecting the stability and lifespan of the equipment.

[0004] Existing gateway bases typically require complex steps to adjust component positions or disassemble devices, such as removing multiple screws, using special tools, or rewiring. This makes the installation, adjustment, and disassembly process time-consuming and labor-intensive. When users need to adjust the position of gateway components, they may need to completely disassemble the base or other fixed parts before repositioning and fixing the gateway components. This process is not only time-consuming but may also affect the normal operation of other adjacent devices. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the problems existing in the prior art, this utility model provides a base for a computer gateway to solve the technical problems mentioned in the background art, such as the lack of space adjustment capability of the gateway component and the inconvenience of disassembling and reassembling the gateway component during the position adjustment process.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a base for a computer gateway, comprising a base plate, a space adjustment mechanism, a position fixing mechanism, and a disassembly auxiliary mechanism. The space adjustment mechanism includes a drive motor, a rotating plate, a support plate, a rotating shaft, a mounting bracket, a longitudinal groove, and adjustment holes. The rotating shaft is installed at both ends of the rotating plate and is rotatably mounted on the support plates on both sides of the base plate. The drive motor is connected to the rotating shaft. The mounting bracket is longitudinally slidably mounted in the longitudinal groove on the rotating plate. Multiple sets of adjustment holes are provided on the mounting bracket. The mounting bracket is fixed in the longitudinal groove by the position fixing mechanism. The position fixing mechanism includes a clamping tube, a clamping rod, an extension spring, an extension rod, an inner pressure ring, and a clamping ramp. The clamping ramp is provided on the inner wall of the clamping tube. The extension rod is installed at one end of the extension spring. The extension spring and the extension rod are laterally mounted on the outer wall of the clamping rod. The inner pressure ring is longitudinally slidably mounted on the inner wall of the clamping tube. The extension rod extends laterally between the clamping ramp and the inner pressure ring, fixing the clamping rod inside the clamping tube.

[0009] The present invention is further configured such that the position fixing mechanism includes an outer rotating ring, a spiral plate, a longitudinal moving ring, a spiral groove, and a longitudinal moving rod. The longitudinal moving ring is longitudinally slidably installed on the outer wall of the clamping tube, and the longitudinal moving rod is longitudinally slidably installed on the outer wall of the clamping tube. Both ends of the longitudinal moving rod are connected to the inner pressure ring and the longitudinal moving ring. The spiral groove is provided on the outer wall of the longitudinal moving ring. The outer rotating ring is rotatably installed on the outer wall of the clamping tube. The spiral plate is installed at the bottom end of the outer rotating ring. The spiral plate and the spiral groove are slidably connected. Rotating the spiral plate drives the longitudinal moving ring to move longitudinally, causing the inner pressure ring to press against one end of the outward extension rod, causing the outward extension rod to retract to the side of the clamping rod, and causing the clamping tube and the clamping rod to disengage.

[0010] The present invention is further configured such that a longitudinal plate is installed on the rotating plate, and the longitudinal plate is fixedly installed on the outer end of the longitudinal groove. The installation of the longitudinal plate can enhance the stability of the rotating plate and make the adjustment of the mounting bracket smoother.

[0011] The present invention is further configured such that a connecting plate is installed at the bottom end of the side wall of the clamping tube, and the connecting plate is fixedly installed on one end face of the longitudinal plate. By fixing the connecting plate to one end of the longitudinal plate, the connection between the clamping tube and other components is strengthened, and the connection is prevented from becoming loose due to vibration or external force.

[0012] The present invention is further configured such that one end of the locking rod can pass through different adjustment holes on the mounting frame and extend through the longitudinal plate to engage with the locking tube. The locking rod passes through the adjustment hole and engages tightly with the locking tube, providing a reliable locking function to prevent the mounting frame from moving during adjustment and ensuring the stability and safety of the equipment.

[0013] The present invention is further configured such that a movable block is installed at the bottom end of the base plate, and a lead screw assembly is installed at the bottom end of the base plate. The movable block is installed on the lead screw assembly. By driving the movable block through the lead screw, the horizontal movement of the equipment can be precisely controlled, so that the equipment can adapt to different installation environments or needs.

[0014] The present invention is further configured such that a stabilizing spring is installed between the connecting plate and the longitudinal moving ring, a longitudinal moving groove is longitudinally opened on the outer wall of the clamping tube, and the longitudinal moving rod is longitudinally slidably arranged in the longitudinal moving groove.

[0015] The present invention is further configured such that a gateway component is fixedly installed on the mounting bracket, and the mounting bracket can be longitudinally slidably fixed and rotated and adjusted on the rotating plate.

[0016] (III) Beneficial Effects

[0017] Compared with the prior art, this utility model provides a base for a computer gateway, which has the following advantages:

[0018] This invention features a space adjustment mechanism. A drive motor rotates the shaft, allowing the mounting bracket to slide longitudinally within the groove. This enables precise adjustment of the equipment's position and spatial configuration to accommodate various installation needs. The design of the rotating plate and support plate ensures stability during the adjustment process, reducing potential vibrations or instability and thus improving equipment reliability. The drive motor allows for electric adjustment, eliminating the need for tedious manual adjustments and improving operational efficiency.

[0019] This utility model features a position fixing mechanism that effectively secures the mounting frame within the longitudinal groove using components such as a locking tube, locking rod, and extension spring. This prevents accidental displacement of the mounting frame during adjustment, ensuring equipment stability. The position fixing mechanism, with its multiple sets of adjustment holes, allows for precise adjustment of the mounting frame's position to meet various application requirements. The design of the inner pressure ring and extension rod makes fixing and releasing operations simple and quick, improving the maintainability of the equipment.

[0020] This invention incorporates a disassembly auxiliary mechanism. Through structural designs such as a spiral plate and an outer rotating ring, the disassembly process becomes much simpler. The rotating spiral plate drives the longitudinal moving ring, causing the inner pressure ring to press against the outward extending rod, thereby separating the locking tube and the locking rod, enabling rapid disassembly of the component. The design of the disassembly auxiliary mechanism reduces the difficulties and operational risks associated with manual disassembly, improving work efficiency. During disassembly, the precise coordination of the disassembly auxiliary mechanism prevents damage to components or personal injury caused by improper operation. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the overall structure of the device in the unused state of this utility model;

[0022] Figure 2 This is a schematic diagram of the overall structure of the base in this utility model;

[0023] Figure 3 This is a structural diagram illustrating the installation method of the gateway component in this utility model;

[0024] Figure 4 This is a schematic diagram of the position fixing mechanism and the disassembly auxiliary mechanism in this utility model;

[0025] Figure 5 This is a schematic diagram of the internal structure of the position fixing mechanism and the disassembly auxiliary mechanism in this utility model.

[0026] In the diagram: 1. Base plate; 2. Drive motor; 3. Rotating plate; 4. Support plate; 5. Rotating shaft; 6. Mounting bracket; 7. Longitudinal groove; 8. Adjustment hole; 9. Clip-on pipe; 10. Clip-on rod; 11. Outer extension spring; 12. Outer extension rod; 13. Inner pressure ring; 14. Clip slope; 15. Outer rotating ring; 16. Spiral plate; 17. Longitudinal movement ring; 18. Spiral groove; 19. Longitudinal movement rod; 20. Longitudinal plate; 21. Connecting plate; 22. Moving block; 23. Lead screw assembly; 24. Stabilizing spring; 25. Longitudinal movement groove; 26. Gateway assembly. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0029] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0030] Please see Figures 1-5A base for a computer gateway includes a base plate 1, a space adjustment mechanism, a position fixing mechanism, and a disassembly auxiliary mechanism. The space adjustment mechanism includes a drive motor 2, a rotating plate 3, a support plate 4, a rotating shaft 5, a mounting bracket 6, a longitudinal groove 7, and adjustment holes 8. The rotating shaft 5 is mounted at both ends of the rotating plate 3 and is rotatably supported on the support plates 4 on both sides of the base plate 1. The drive motor 2 is connected to the rotating shaft 5. The mounting bracket 6 is longitudinally slidably mounted in the longitudinal groove 7 on the rotating plate 3. Multiple sets of adjustment holes 8 are formed on the mounting bracket 6, allowing adjustment by position adjustment. The fixing mechanism fixes the mounting bracket 6 in the longitudinal groove 7. The position fixing mechanism includes a clamping tube 9, a clamping rod 10, an extension spring 11, an extension rod 12, an inner pressure ring 13, and a clamping slope 14. The clamping slope 14 is set on the inner wall of the clamping tube 9. The extension rod 12 is installed at one end of the extension spring 11. The extension spring 11 and the extension rod 12 are installed laterally on the outer wall of the clamping rod 10. The inner pressure ring 13 is slidably installed longitudinally on the inner wall of the clamping tube 9. The extension rod 12 extends laterally between the clamping slope 14 and the inner pressure ring 13, so that the clamping rod 10 is fixed in the clamping tube 9.

[0031] In this embodiment, the space adjustment mechanism achieves precise control of the gateway position through multi-dimensional adjustment. The drive motor 2 drives the rotating shaft 5 to rotate. The two ends of the rotating shaft 5 are supported on the support plate 4 on the side of the base plate 1, which drives the rotating plate 3 to adjust the angle. The mounting bracket 6 can slide in the longitudinal groove 7 of the rotating plate 3 and provide different height positions through multiple sets of adjustment holes 8. The longitudinal plate 20 is fixed to the outer end of the longitudinal groove 7 to provide installation support for the position fixing mechanism. The moving block 22 at the bottom of the base plate 1, together with the lead screw assembly 23, can realize the overall horizontal position adjustment. The locking rod 10 can pass through the adjustment hole 8 of the mounting bracket 6 and the longitudinal plate 20 to form a locking with the locking tube 9. The outer extension spring 11 and the outer extension rod 12 on the outer wall of the locking rod 10 cooperate with the locking slope 14 on the inner wall of the locking tube 9. At the same time, the inner pressure ring 13 can apply pressure to the outer extension rod 12 to form a reliable lock. The locking tube 9 is fixedly connected to the longitudinal plate 20 through the connecting plate 21 to ensure the stability of the overall structure. The stabilizing spring 24 between the connecting plate 21 and the longitudinal moving ring 17 further enhances the fixing effect.

[0032] The positioning mechanism includes an outer rotating ring 15, a spiral plate 16, a longitudinal moving ring 17, a spiral groove 18, and a longitudinal moving rod 19. The longitudinal moving ring 17 is longitudinally slidably mounted on the outer wall of the clamping tube 9, and the longitudinal moving rod 19 is longitudinally slidably mounted on the outer wall of the clamping tube 9. Both ends of the longitudinal moving rod 19 are connected to the inner pressure ring 13 and the longitudinal moving ring 17. The spiral groove 18 is provided on the outer wall of the longitudinal moving ring 17. The outer rotating ring 15 is rotatably mounted on the outer wall of the clamping tube 9. The spiral plate 16 is mounted on the bottom end of the outer rotating ring 15. The spiral plate 16 and the spiral groove 18 are slidably connected. Rotating the spiral plate 16 drives the longitudinal moving ring 17 to move longitudinally, causing the inner pressure ring 13 to press against one end of the outward extension rod 12, causing the outward extension rod 12 to retract to the side of the clamping rod 10, and causing the clamping tube 9 and the clamping rod 10 to disengage.

[0033] In this embodiment, convenient position adjustment is achieved. The outer rotating ring 15 cooperates with the spiral groove 18 on the outer wall of the longitudinal moving ring 17 through the spiral plate 16 at the bottom, which can drive the longitudinal moving ring 17 to move up and down. The longitudinal moving ring 17 is connected to the inner pressure ring 13 through the longitudinal moving rod 19. The longitudinal moving rod 19 slides in the longitudinal moving groove 25 on the outer wall of the clamping tube 9. When the outer rotating ring 15 is rotated, the spiral transmission causes the longitudinal moving ring 17 to drive the inner pressure ring 13 to press against the outward extension rod 12, so that the outward extension rod 12 retracts to the side of the clamping rod 10, thereby releasing the clamping state and facilitating position adjustment.

[0034] Please see Figures 1-5 As a supplementary embodiment of a base for a computer gateway, which includes a space adjustment mechanism, a position fixing mechanism, and a disassembly auxiliary mechanism: A longitudinal plate 20 is installed on the rotating plate 3, and the longitudinal plate 20 is fixedly installed on the outer end of the longitudinal groove 7. A connecting plate 21 is installed on the bottom end of the side wall of the clamping tube 9, and the connecting plate 21 is fixedly installed on one end face of the longitudinal plate 20. One end of the clamping rod 10 can pass through different adjustment holes 8 on the mounting frame 6 and extend through the longitudinal plate 20 to engage with the clamping tube 9. A moving block 22 is installed on the bottom end of the base plate 1, and a lead screw assembly 23 is installed on the bottom end of the base plate 1. The moving block 22 is fitted onto the lead screw assembly 23. A stabilizing spring 24 is installed between the connecting plate 21 and the longitudinal movement ring 17. A longitudinal movement groove 25 is longitudinally opened on the outer wall of the clamping tube 9, and the longitudinal movement rod 19 is longitudinally slidably set within the longitudinal movement groove 25. A gateway assembly 26 is fixedly installed on the mounting frame 6, and the mounting frame 6 can be longitudinally slidably fixed and rotated on the rotating plate 3.

[0035] More specifically, the drive motor 2 first rotates the rotating plate 3, thereby pushing the mounting bracket 6 to slide along the longitudinal groove 7, adjusting the position of the gateway assembly 26. During the adjustment process, multiple adjustment holes 8 allow the locking rod 10 to be positioned, ensuring that the mounting bracket 6 can be precisely adjusted to the required position. After the spatial adjustment is completed, the position fixing mechanism locks the mounting bracket 6 through the cooperation of the locking rod 10 and the locking tube 9. The cooperation of the inner pressure ring 13 and the outer extension rod 12 ensures the stability of the locking rod 10, preventing any unnecessary changes in position. When disassembly is required, the rotation of the outer rotating ring 15 will cause the spiral plate 16 to slide in the spiral groove 18, thereby loosening the inner pressure ring 13 on the locking rod 10, quickly releasing the locking state, and facilitating disassembly. Throughout the process, the movement of the mounting bracket 6 and the gateway assembly 26 is very precise, and the mounting bracket 6 can slide and rotate longitudinally on the longitudinal plate 20, ensuring a high degree of flexibility.

[0036] In summary, when the overall equipment is in use or running: when the space adjustment mechanism is required, the space adjustment mechanism achieves precise control of the gateway position through multi-dimensional adjustment. The drive motor 2 drives the rotating shaft 5 to rotate. The two ends of the rotating shaft 5 are supported on the support plate 4 on the side of the base plate 1, which drives the rotating plate 3 to adjust the angle. The mounting bracket 6 can slide in the longitudinal groove 7 of the rotating plate 3 and provides different height positions through multiple sets of adjustment holes 8. The longitudinal plate 20 is fixed at the outer end of the longitudinal groove 7 to provide installation support for the position fixing mechanism. The moving block 22 at the bottom of the base plate 1, together with the lead screw assembly 23, can realize the overall horizontal position adjustment.

[0037] When the positioning and fixing mechanism is in operation, the locking rod 10 can pass through the adjustment hole 8 and the longitudinal plate 20 of the mounting bracket 6 to form a locking connection with the locking tube 9. The outer extension spring 11 and the outer extension rod 12 on the outer wall of the locking rod 10 cooperate with the locking slope 14 on the inner wall of the locking tube 9. At the same time, the inner pressure ring 13 can apply pressure to the outer extension rod 12 to form a reliable lock. The locking tube 9 is fixedly connected to the longitudinal plate 20 through the connecting plate 21 to ensure the stability of the overall structure. The stabilizing spring 24 between the connecting plate 21 and the longitudinal movement ring 17 further enhances the fixing effect.

[0038] When the auxiliary mechanism needs to be disassembled, convenient position adjustment can be achieved. The outer rotating ring 15 cooperates with the spiral groove 18 on the outer wall of the longitudinal moving ring 17 through the spiral plate 16 at the bottom, which can drive the longitudinal moving ring 17 to move up and down. The longitudinal moving ring 17 is connected to the inner pressure ring 13 through the longitudinal moving rod 19. The longitudinal moving rod 19 slides in the longitudinal moving groove 25 on the outer wall of the clamping tube 9. When the outer rotating ring 15 is rotated, the spiral drive causes the longitudinal moving ring 17 to drive the inner pressure ring 13 to press against the outer extension rod 12, so that the outer extension rod 12 retracts to the side of the clamping rod 10, thereby releasing the clamping state and facilitating position adjustment.

[0039] First, the drive motor 2 drives the rotating plate 3 to rotate, thereby pushing the mounting bracket 6 to slide along the longitudinal groove 7 and adjusting the position of the gateway assembly 26. During the adjustment process, multiple adjustment holes 8 allow the locking rod 10 to be positioned, ensuring that the mounting bracket 6 can be accurately adjusted to the required position. After the spatial adjustment is completed, the position fixing mechanism locks the mounting bracket 6 through the cooperation of the locking rod 10 and the locking tube 9. The cooperation of the inner pressure ring 13 and the outer extension rod 12 ensures the stability of the locking rod 10 and prevents any unnecessary changes in position. When disassembly is required, the rotation of the outer rotating ring 15 will drive the spiral plate 16 to slide in the spiral groove 18, thereby loosening the inner pressure ring 13 on the locking rod 10, quickly releasing the locking state, and facilitating disassembly. Throughout the process, the movement of the mounting bracket 6 and the gateway assembly 26 is very precise, and the mounting bracket 6 can slide and rotate longitudinally on the longitudinal plate 20, ensuring a high degree of flexibility.

[0040] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A base for a computer gateway, comprising a base plate (1), a space adjustment mechanism, a position fixing mechanism, and a disassembly auxiliary mechanism, characterized in that: The space adjustment mechanism includes a drive motor (2), a rotating plate (3), a support plate (4), a rotating shaft (5), a mounting bracket (6), a longitudinal groove (7), and adjustment holes (8). The rotating shaft (5) is installed at both ends of the rotating plate (3) and is rotatably supported on the support plates (4) on both sides of the base plate (1). The drive motor (2) is connected to the rotating shaft (5). The mounting bracket (6) is longitudinally slidably installed in the longitudinal groove (7) on the rotating plate (3). Multiple sets of adjustment holes (8) are opened on the mounting bracket (6). The mounting bracket (6) is fixed by the position fixing mechanism. Within the longitudinal groove (7), the position fixing mechanism includes a locking tube (9), a locking rod (10), an extension spring (11), an extension rod (12), an inner pressure ring (13), and a locking ramp (14). The locking ramp (14) is located on the inner wall of the locking tube (9). The extension rod (12) is installed at one end of the extension spring (11). The extension spring (11) and the extension rod (12) are installed laterally on the outer wall of the locking rod (10). The inner pressure ring (13) is slidably installed longitudinally on the inner wall of the locking tube (9). The extension rod (12) extends laterally between the locking ramp (14) and the inner pressure ring (13).

2. The base for a computer gateway according to claim 1, characterized in that: The position fixing mechanism includes an outer rotating ring (15), a spiral plate (16), a longitudinal moving ring (17), a spiral groove (18), and a longitudinal moving rod (19). The longitudinal moving ring (17) is longitudinally slidably mounted on the outer wall of the clamping tube (9), and the longitudinal moving rod (19) is longitudinally slidably mounted on the outer wall of the clamping tube (9). The two ends of the longitudinal moving rod (19) are connected to the inner pressure ring (13) and the longitudinal moving ring (17). The spiral groove (18) is set on the outer wall of the longitudinal moving ring (17). The ring (15) is limited to rotate and installed on the outer wall of the clamping tube (9). The spiral plate (16) is installed at the bottom end of the outer rotating ring (15). The spiral plate (16) and the spiral groove (18) are slidably connected. Rotating the spiral plate (16) drives the longitudinal moving ring (17) to move longitudinally, so that the inner pressure ring (13) presses against one end of the outer extension rod (12), so that the outer extension rod (12) retracts to the side of the clamping rod (10), so that the clamping tube (9) and the clamping rod (10) disengage.

3. A base for a computer gateway according to claim 2, characterized in that: A longitudinal plate (20) is installed on the rotating plate (3), and the longitudinal plate (20) is fixedly installed at the outer end of the longitudinal groove (7).

4. A base for a computer gateway according to claim 3, characterized in that: A connecting plate (21) is installed at the bottom of the side wall of the card tube (9), and the connecting plate (21) is fixedly installed on one end face of the longitudinal plate (20).

5. A base for a computer gateway according to claim 3, characterized in that: One end of the snap-fit ​​rod (10) can pass through different adjustment holes (8) on the mounting bracket (6) and extend through the longitudinal plate (20) to engage with the snap-fit ​​tube (9).

6. A base for a computer gateway according to claim 1, characterized in that: A movable block (22) is installed at the bottom end of the base plate (1), and a lead screw assembly (23) is installed at the bottom end of the base plate (1). The movable block (22) is installed on the lead screw assembly (23).

7. A base for a computer gateway according to claim 4, characterized in that: A stabilizing spring (24) is installed between the connecting plate (21) and the longitudinal moving ring (17). A longitudinal moving groove (25) is longitudinally opened on the outer wall of the clamping pipe (9), and the longitudinal moving rod (19) is longitudinally slidably arranged in the longitudinal moving groove (25).

8. A base for a computer gateway according to claim 1, characterized in that: The mounting bracket (6) is fixedly mounted with a gateway component (26), and the mounting bracket (6) can be longitudinally slidably fixed and rotated on the rotating plate (3).

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