A retractable platform of a four-generation residential staggered balcony

Abstract

The application provides a telescopic platform of a four-generation residential staggered balcony, and relates to the technical field of building construction. The support beam is provided with a butt joint plate for connecting with a building body. The first platform is provided with a second platform which is telescopically slidable relative to the first platform. The second platform is provided with a guardrail. The second platform can keep the balcony protection function under different extension sizes. The butt joint plate is arranged on one side of the support beam. The transmission components are arranged in the internal space of the support beam and the first platform. The transmission components are protected from rain and dust.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and more specifically, it relates to a retractable platform for a staggered balcony of a fourth-generation residential building. Background Technology

[0002] The staggered balcony of the fourth-generation housing is a three-dimensional balcony structure designed by arranging odd and even floors in a staggered manner. Its core feature is that each household's balcony is located at a different elevation plane, forming a staggered spatial hierarchy. Prefabricated fixed platforms are installed at the staggered floor slabs, allowing the space to be extended horizontally. This design breaks through the traditional balcony layout, eliminates the feeling of oppression at the top through the open space, and at the same time achieves the living experience of each household having its own private terrace and a rooftop garden through staggered floors.

[0003] The existing staggered balcony platforms cannot be extended or adjusted, making it difficult to flexibly adapt to different spatial needs and usage scenarios. They cannot be adjusted in size according to actual needs, which greatly limits their use during house renovations or functional changes, potentially leading to wasted space or failure to meet new functional requirements. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a retractable platform for a fourth-generation residential staggered-level balcony.

[0005] A retractable platform for a staggered balcony in a fourth-generation residential building includes a support beam with a docking plate for connection to the main building structure.

[0006] Preferably, a first platform is provided on the support beam, and a second platform that can slide and extend relative to the first platform is slidably fitted on the first platform. A protective railing is provided on the second platform. A drive rotating head and a mechanical transmission reversing mechanism are assembled on the support beam. The drive rotating head is connected to the second platform through the mechanical transmission reversing mechanism. The operator uses an external hex wrench to turn the drive rotating head, and the drive rotating head outputs rotational motion. The rotational power completes multi-stage reversal and motion conversion through the mechanical transmission reversing mechanism, converting the rotational power into linear driving force and transmitting it to the second platform. This drives the second platform to extend or retract relative to the first platform to adjust the platform area. When the drive rotating head is rotated in the opposite direction, the entire mechanism rotates in the opposite direction, causing the second platform to retract inward and reduce the platform's extension size. A first sliding guide pair is provided between the first platform and the second platform, and a second sliding guide pair is provided between the support beam and the second platform. During the entire process of the second platform extending or retracting, the first sliding guide pair and the second sliding guide pair slide relative to each other synchronously, jointly constraining the movement trajectory of the second platform.

[0007] Preferably, the first sliding guide pair includes a support bar on the first platform and a strip groove on the second platform that is adapted to the support bar. A slider is provided on the outer side of the support bar, and a groove is formed on the inner wall of the strip groove to cooperate with the slider. During the sliding process of the second platform, the grooves on both sides of the inner wall of the strip groove on the second platform slide relative to the sliders fixed on both sides of the support bar of the first platform. The slider can slide along the inside of the groove to realize the sliding guidance between the first platform and the second platform.

[0008] Preferably, the second sliding guide pair includes a fixing strip fixed to the bottom of the support beam, a movable plate connected to the fixing strip, and an installation groove adapted to the movable plate at the bottom of the second platform. Limiting blocks are provided on both sides of the movable plate, and limiting grooves adapted to the limiting blocks are provided on the inner wall of the installation groove. During the sliding of the second platform, the limiting grooves on both sides of the inner wall of the installation groove at the bottom of the second platform slide synchronously along the limiting blocks on both sides of the movable plate connected to the fixing strip. The limiting blocks can slide along the inside of the limiting groove to realize the sliding limitation of the support beam and the second platform.

[0009] Preferably, the rotating head has a drive groove for external tools to drive it. The operator uses an external hex wrench to turn the rotating head to make it rotate. The mechanical transmission reversing mechanism includes a rotating shaft, a worm, a worm wheel, a shaft, a driving bevel gear, a driven bevel gear, a rotating rod, a lead screw, and a threaded sleeve that engages with the lead screw. The rotating head is fixedly connected to the rotating shaft. When the rotating head rotates, it drives the rotating shaft connected below to rotate together. The rotating shaft transmits rotation to the lead screw through the engagement of the worm and worm wheel, and the engagement of the driving bevel gear and the driven bevel gear. The rotating shaft drives the worm to rotate synchronously. During the rotation of the worm, it meshes with the worm wheel, converting the vertical rotational power into horizontal rotational power. The worm wheel drives the shaft to rotate. The driving bevel gears at both ends of the shaft rotate synchronously with the shaft. The driving bevel gears on both sides mesh with the corresponding driven bevel gears to change the direction of power transmission again. The driven bevel gear drives the rotating rod to rotate, and the rotating rod drives the lead screw to rotate synchronously. The threaded sleeve is connected to the second platform for transmission.

[0010] Preferably, the lower end of the rotating shaft is fixedly connected to the worm gear, and the rotating shaft is rotatably assembled inside the support beam through a bearing. The rotating shaft achieves stable rotation inside the support beam by relying on the bearing. The lower end of the worm gear is rotatably supported in the inner cavity of the support beam through a bearing seat, and the bearing seat provides rotational support for the worm gear. The worm wheel meshes with the worm gear, and the worm wheel is coaxially and fixedly assembled with the shaft.

[0011] Preferably, driving bevel gears are fixedly installed at both ends of the shaft, and each driving bevel gear meshes with a driven bevel gear. The shaft is rotatably mounted inside the support beam via a bushing. The shaft rotates horizontally inside the support beam by relying on the bushing. Each driven bevel gear is fixedly connected to a rotating rod. A rotating frame is fixedly installed inside the support beam, and the rotating rod is rotatably mounted on the rotating frame. The rotating rod is limited by the rotating frame to ensure that its position does not shift during rotation. The rotating rod is fixedly connected to a lead screw. The first platform has a rectangular groove, and a limiting sleeve is provided on the outside of the lead screw. The limiting sleeve is slidably mounted inside the rectangular groove. When the two lead screws rotate... The threaded sleeve, which is threaded to the screw, experiences axial displacement due to the side effects of the thread. The limiting sleeve is fitted inside the rectangular groove of the first platform. The rectangular groove provides circumferential constraint to the limiting sleeve, preventing the threaded sleeve from rotating with the screw and allowing the threaded sleeve to move linearly only along the axis of the screw. The limiting sleeve is used to restrict the threaded sleeve from rotating with the screw. A transmission rod is provided between the limiting sleeve and the second platform. The rotation of the screw drives the threaded sleeve to move axially along the screw. The limiting sleeve transmits linear thrust to the second platform through multiple transmission rods. The limiting sleeve and the transmission rod drive the second platform to complete the telescopic movement. The drive groove at the top of the rotating head is a hexagonal groove, which is adapted to a hexagonal wrench as an external driving tool.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In this invention, the rotating head receives the rotational torque input from an external hexagonal wrench, which drives the worm gear to rotate via the rotating shaft. The worm gear meshes with the worm wheel to complete one reversal transmission. The worm wheel drives the shaft to rotate. The active bevel gears at both ends of the shaft cooperate with the driven bevel gears to achieve a second reversal. The driven bevel gears drive the rotating rod to drive the lead screw to rotate. The lead screw drives the lead sleeve to generate axial displacement. The lead sleeve, with the help of the limiting sleeve and the transmission rod, drives the second platform to extend or retract relative to the first platform. This allows for flexible adjustment of the balcony platform's extension size, overcoming the defect of the fixed platform size of traditional fourth-generation residential staggered balconies. It can adapt to different usage scenarios. When renovating a house or changing its function, the platform's usable area can be adjusted without completely dismantling and replacing the platform components, thus reducing renovation and construction costs.

[0014] In this invention, the rotating shaft is mounted inside the support beam with the aid of bearings. The lower end of the worm gear is supported by a bearing seat for rotation, and the shaft is supported by a bushing for rotation. The rotating rod is mounted on the rotating frame for rotation. Each transmission component is constrained by corresponding rotational support, ensuring that the rotational power output by the rotating head can be stably transmitted step by step. This avoids radial movement, wobbling, and shaking of the rotating shaft, worm gear, shaft, and rotating rod during transmission. As a result, the entire mechanical transmission reversing mechanism can operate smoothly with low transmission loss. The operation of the rotating head driven by the wrench is less strenuous, and the reliability of the device is improved.

[0015] In this invention, the limiting sleeve on the outside of the threaded sleeve is slidably assembled inside the rectangular groove of the first platform. The rectangular groove forms a circumferential limit on the limiting sleeve. During the rotation of the lead screw, the threaded sleeve is prevented from rotating synchronously with the lead screw, and the rotational motion of the lead screw is converted into the linear displacement of the threaded sleeve. The power is then output to the second platform by the transmission rod. In this way, the rotational input power can be efficiently converted into the linear telescopic motion of the second platform, avoiding the threaded sleeve from spinning idly and ensuring that the telescopic drive action can be executed stably.

[0016] In this invention, the sliders on both sides of the first platform support strip in the first sliding guide pair slide inside the groove on the inner side of the second platform strip groove, while the limiting blocks on both sides of the moving plate in the second sliding guide pair slide synchronously inside the limiting groove on the inner side of the second platform mounting groove. The two sets of guide pairs jointly provide double constraints on the movement trajectory of the second platform, thereby strictly limiting the movement trajectory of the second platform throughout the entire extension and retraction process. This avoids problems such as deviation, warping, and shaking during the sliding process of the second platform, improves the stability of the extension and retraction movement of the second platform and the overall structural reliability, and ensures the safety performance of the balcony platform during its use.

[0017] In this invention, a guardrail is installed on the second platform. Combined with the retractable second platform structure, the guardrail can move synchronously with the second platform regardless of its extended or retracted position. This ensures the balcony's protective function is maintained under different extension dimensions, preventing safety hazards caused by changes in the platform's extension length and guaranteeing the safety of balcony users. Simultaneously, a connecting plate is installed on one side of the support beam, allowing the entire platform to be assembled into the building structure. All transmission components are housed within the support beam and the first platform's internal space, eliminating exposed transmission parts. This protects worm gears, screws, and other transmission components from rain and dust corrosion, preventing rust and jamming, extending the device's lifespan, and maintaining a clean balcony appearance. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is a partial cross-sectional view of the present invention;

[0020] Figure 3 This is a fixed-strip sectional view of the present invention;

[0021] Figure 4 This is a schematic diagram of the bottom three-dimensional structure of the present invention;

[0022] Figure 5 This is a cross-sectional view of the support beam of the present invention;

[0023] Figure 6 This is the present invention. Figure 5Enlarged view of the structure at point A in the image;

[0024] Figure 7 This is a planar sectional view of the first platform of the present invention;

[0025] Figure 8 This is a schematic diagram of the planar structure of the limiting sleeve of the present invention;

[0026] Figure 9 This is a planar sectional view of the second platform of the present invention.

[0027] In the figure, the correspondence between the component names and the attached drawing numbers is as follows: 1. Support beam; 2. Connecting plate; 3. First platform; 4. Second platform; 5. Guardrail; 6. Strip groove; 7. Support bar; 8. Slider; 9. Slide groove; 10. Fixing bar; 11. Moving plate; 12. Mounting groove; 13. Limiting block; 14. Limiting groove; 15. Rotating head; 16. Rotating shaft; 17. Bearing; 18. Worm gear; 19. Shaft seat; 20. Worm wheel; 21. Shaft rod; 22. Shaft sleeve; 23. Driving bevel gear; 24. Driven bevel gear; 25. Rotating rod; 26. Rotating frame; 27. Lead screw; 28. Lead sleeve; 29. ​​Rectangular groove; 31. Limiting sleeve; 32. Transmission rod. Detailed Implementation

[0028] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0029] Please see Figure 1 - Figure 9 The present invention provides a retractable platform for a staggered balcony of a fourth-generation residential building, including a support beam 1, the support beam 1 being provided with a docking plate 2 for connecting with the main building body;

[0030] Among them, a connecting plate 2 is set on one side of the support beam 1, and the entire platform is assembled into the main body of the building by relying on the connecting plate 2. All transmission components are arranged and stored in the internal space of the support beam 1 and the first platform 3. There are no exposed transmission parts on the outside of the whole machine, which can protect the transmission components such as worm 18, worm wheel 20, and lead screw 27, reduce the corrosion and jamming of parts caused by rainwater and dust, extend the service life of the device, and at the same time ensure the clean appearance of the balcony.

[0031] A first platform 3 is provided on the support beam 1. A second platform 4, which can slide and retract relative to the first platform 3, is slidably sleeved on the first platform 3. A protective railing 5 is provided on the second platform 4. A drive rotating head 15 and a mechanical transmission reversing mechanism are assembled on the support beam 1. The drive rotating head 15 is connected to the second platform 4 through the mechanical transmission reversing mechanism to drive the second platform 4 to extend or retract relative to the first platform 3 to achieve platform area adjustment. A first sliding guide pair is provided between the first platform 3 and the second platform 4. A second sliding guide pair is provided between the support beam 1 and the second platform 4.

[0032] The rotating head 15 receives the rotational torque input from an external hexagonal wrench, which drives the worm gear 18 to rotate via the rotating shaft 16. The worm gear 18 meshes with the worm wheel 20 to complete a first reversal transmission. The worm wheel 20 drives the shaft 21 to rotate. The active bevel gears 23 at both ends of the shaft 21 cooperate with the driven bevel gears 24 to achieve a second reversal. The driven bevel gears 24 drive the rotating rod 25 to drive the lead screw 27 to rotate. The lead screw 27 drives the threaded sleeve 28 to generate axial displacement. The threaded sleeve 28 drives the second platform 4 to extend or retract relative to the first platform 3 with the help of the limiting sleeve 31 and the transmission rod 32. This allows for flexible adjustment of the balcony platform extension size, overcoming the defect that the fixed platform size of the traditional fourth-generation residential staggered balcony cannot be changed. It can adapt to different usage scenarios. When the house is renovated or the function is changed, the platform usage area can be adjusted without the need to completely dismantle and replace the platform components, thus reducing the renovation and construction costs.

[0033] By installing a guardrail 5 on the second platform 4, and in conjunction with the retractable structure of the second platform 4, the guardrail 5 can move synchronously with the second platform 4 regardless of whether the second platform 4 is extended or retracted. This ensures that the balcony protection function can be maintained under different extension dimensions, avoids the safety hazard of loss of protection after the platform changes its extension length, and ensures the safety of people using the balcony.

[0034] The first sliding guide pair includes a support bar 7 on the first platform 3 and a strip groove 6 on the second platform 4 that is adapted to the support bar 7. A slider 8 is provided on the outside of the support bar 7, and a sliding groove 9 that cooperates with the slider 8 is opened on the inner wall of the strip groove 6. The slider 8 can slide along the inside of the sliding groove 9 to realize sliding guidance between the first platform 3 and the second platform 4.

[0035] The first and second sliding guide pairs work together. The sliders 8 on both sides of the support bar 7 of the first platform 3 in the first sliding guide pair slide inside the groove 9 inside the strip groove 6 of the second platform 4. At the same time, the limiting blocks 13 on both sides of the moving plate 11 in the second sliding guide pair slide synchronously inside the limiting groove 14 inside the mounting groove 12 of the second platform 4. The two sets of guide pairs jointly constrain the movement trajectory of the second platform 4, thereby strictly limiting the movement trajectory of the second platform 4 throughout the entire extension and retraction process. This avoids problems such as deviation, warping, and shaking during the sliding process of the second platform 4, improves the stability of the extension and retraction movement of the second platform 4 and the overall structural reliability, and ensures the safety performance of the balcony platform during its use.

[0036] The second sliding guide pair includes a fixing strip 10 fixed to the bottom of the support beam 1, a movable plate 11 connected to the fixing strip 10, and an installation groove 12 adapted to the movable plate 11 at the bottom of the second platform 4. Limiting blocks 13 are provided on both sides of the movable plate 11. A limiting groove 14 adapted to the limiting block 13 is provided on the inner wall of the installation groove 12. The limiting block 13 can slide along the inside of the limiting groove 14 to realize the sliding limitation between the support beam 1 and the second platform 4.

[0037] The rotating head 15 has a drive groove for external tools to drive it. The mechanical transmission reversing mechanism includes a rotating shaft 16, a worm 18, a worm wheel 20, a shaft 21, a driving bevel gear 23, a driven bevel gear 24, a rotating rod 25, a lead screw 27, and a threaded sleeve 28 that is threaded into the lead screw 27. The rotating head 15 is fixedly connected to the rotating shaft 16. The rotating shaft 16 transmits rotation to the lead screw 27 through the worm 18 and worm wheel 20, and the driving bevel gear 23 and driven bevel gear 24. The threaded sleeve 28 is connected to the second platform 4 for transmission.

[0038] The lower end of the rotating shaft 16 is fixedly connected to the worm 18. The rotating shaft 16 is rotatably assembled inside the support beam 1 through the bearing 17. The lower end of the worm 18 is rotatably supported in the inner cavity of the support beam 1 through the bearing seat 19. The worm wheel 20 meshes with the worm 18. The worm wheel 20 is coaxially fixedly assembled with the shaft 21.

[0039] The rotating shaft 16 is mounted inside the support beam 1 with the aid of bearing 17. The lower end of the worm gear 18 is supported by the bearing seat 19. The shaft 21 is supported by the bushing 22. The rotating rod 25 is rotatably mounted on the rotating frame 26. Each transmission component is constrained by corresponding rotational support, ensuring that the rotational power output by the rotating head 15 can be stably transmitted step by step. This avoids radial movement, swaying and shaking of the rotating shaft 16, worm gear 18, shaft 21 and rotating rod 25 during transmission. As a result, the entire mechanical transmission reversing mechanism can operate smoothly with low transmission loss. The operation of the rotating head 15 is less strenuous when driven by a wrench, and the reliability of the device is improved.

[0040] The shaft 21 is fixedly provided with driving bevel gears 23 at both ends, and the driving bevel gears 23 mesh with the driven bevel gears 24 one by one. The shaft 21 is rotatably installed in the inner cavity of the support beam 1 through the bushing 22. Each driven bevel gear 24 is fixedly connected to the rotating rod 25. The inner cavity of the support beam 1 is fixedly provided with a rotating frame 26. The rotating rod 25 is rotatably mounted on the rotating frame 26. The rotating rod 25 is fixedly connected to the lead screw 27. The first platform 3 is provided with a rectangular groove 29. The outer side of the lead sleeve 28 is provided with a limiting sleeve 31. The limiting sleeve 31 is slidably mounted in the rectangular groove 29. The limiting sleeve 31 is used to limit the rotation of the lead sleeve 28 following the lead screw 27. A transmission rod 32 is provided between the limiting sleeve 31 and the second platform 4. The rotation of the lead screw 27 drives the lead sleeve 28 to move along the axial direction of the lead screw 27. The second platform 4 is driven to complete the telescopic movement through the limiting sleeve 31 and the transmission rod 32. The drive groove at the top of the rotating head 15 is a hexagonal groove. The hexagonal groove is adapted to a hexagonal wrench as an external driving tool.

[0041] The limiting sleeve 31 on the outside of the threaded sleeve 28 is slidably fitted inside the rectangular groove 29 of the first platform 3. The rectangular groove 29 forms a circumferential limit on the limiting sleeve 31. During the rotation of the lead screw 27, the threaded sleeve 28 is prevented from rotating synchronously with the lead screw 27. The rotational motion of the lead screw 27 is converted into the linear displacement of the threaded sleeve 28. The power is then output to the second platform 4 by the transmission rod 32. Thus, the rotational input power can be efficiently converted into the linear extension and retraction motion of the second platform 4, avoiding the threaded sleeve 28 from spinning idly and ensuring that the extension and retraction drive action can be stably executed.

[0042] Working principle:

[0043] When the retractable platform of the staggered balcony of this fourth-generation residential building is in operation, the operator uses an external hex wrench to turn the rotating head 15, causing the rotating head 15 to rotate. The rotating head 15 drives the connected shaft 16 below to rotate together. The shaft 16 achieves stable rotation inside the support beam 1 by relying on the bearing 17. The lower end of the shaft 16 drives the worm gear 18 to rotate synchronously. During the rotation of the worm gear 18, it meshes with the worm wheel 20, converting the vertical rotational power into the horizontal rotational power. The worm wheel 20 drives the coaxial fixed shaft 21 to rotate.

[0044] The shaft 21 rotates horizontally inside the support beam 1 by means of four bushings 22. The driving bevel gears 23 at both ends of the shaft 21 rotate synchronously with the shaft 21. The driving bevel gears 23 on both sides mesh with the corresponding driven bevel gears 24 to change the direction of power transmission again. The two sets of driven bevel gears 24 drive the rotating rods 25 connected to them to rotate. The rotating rods 25 are limited by the rotating frame 26 to ensure that the position of the rotating rods 25 does not deviate when rotating. The ends of the rotating rods 25 drive the two lead screws 27 to rotate synchronously.

[0045] When the two lead screws 27 rotate, the threaded sleeve 28, which is threaded to them, undergoes axial displacement due to the side effects of the threads. The limiting sleeve 31, which is fixed to the outside of the threaded sleeve 28, is fitted inside the rectangular groove 29 of the first platform 3. The rectangular groove 29 provides circumferential constraint on the limiting sleeve 31, preventing the threaded sleeve 28 from rotating with the lead screws 27, so that the threaded sleeve 28 can only move linearly along the axial direction of the lead screws 27. The limiting sleeve 31 transmits linear thrust to the second platform 4 through multiple transmission rods 32, thereby pushing the second platform 4 to extend outward.

[0046] During the entire process of the second platform 4 sliding outward, there are two synchronously cooperating sliding guide structures: First, the sliding grooves 9 on both sides of the inner wall of the strip groove 6 on the second platform 4 slide relative to the sliders 8 fixed on both sides of the support bar 7 of the first platform 3, and the sliders 8 and the sliding grooves 9 cooperate to limit the movement trajectory in this direction; Second, the limiting grooves 14 on both sides of the inner wall of the mounting groove 12 at the bottom of the second platform 4 slide synchronously along the limiting blocks 13 on both sides of the moving plate 11 connected by the fixed bar 10, and the limiting blocks 13 and the limiting grooves 14 cooperate to constrain the movement path of the second platform 4.

[0047] The two sets of guide structures work simultaneously, forming a double sliding constraint on the second platform 4, effectively eliminating the problems of offset and swaying during the sliding process, and greatly improving the stability and structural reliability of the second platform 4 during the telescopic movement process. After the second platform 4 extends outward, the overall usable area of ​​the balcony platform increases; by using a hex wrench to rotate the rotating head 15 in the opposite direction, the entire transmission mechanism will run in reverse, which can drive the second platform 4 to retract inward and reduce the outward extension size of the platform.

[0048] Relying on the aforementioned complete transmission and guiding structure, this retractable platform can easily adjust the outward extension size of the platform, flexibly adapting to different spatial conditions and usage scenarios of staggered balconies in fourth-generation residential buildings; when the house is renovated or the function of the balcony changes, the size of the platform extension can be adjusted as needed to meet the usage requirements under different working conditions.

[0049] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A retractable platform for a staggered balcony in a fourth-generation residential building, comprising a support beam (1), wherein the support beam (1) is provided with a connecting plate (2) for connection with the main building structure, characterized in that: A first platform (3) is provided on the support beam (1). A second platform (4) that can slide and retract relative to the first platform (3) is slidably sleeved on the first platform (3). A protective railing (5) is provided on the second platform (4). A drive rotating head (15) and a mechanical transmission reversing mechanism are assembled on the support beam (1). The drive rotating head (15) is connected to the second platform (4) through the mechanical transmission reversing mechanism to drive the second platform (4) to extend or retract relative to the first platform (3) to achieve platform area adjustment. A first sliding guide pair is provided between the first platform (3) and the second platform (4). A second sliding guide pair is provided between the support beam (1) and the second platform (4).

2. The retractable platform for a staggered balcony in a fourth-generation residential building as described in claim 1, characterized in that, The first sliding guide pair includes a support bar (7) on the first platform (3) and a strip groove (6) on the second platform (4) that is adapted to the support bar (7). A slider (8) is provided on the outside of the support bar (7). A groove (9) is opened on the inner wall of the strip groove (6) to cooperate with the slider (8). The slider (8) can slide along the inside of the groove (9) to realize sliding guidance between the first platform (3) and the second platform (4).

3. The retractable platform for a fourth-generation residential staggered balcony as described in claim 1, characterized in that, The second sliding guide pair includes a fixing strip (10) fixed to the bottom of the support beam (1), a movable plate (11) connected to the fixing strip (10), and an installation groove (12) adapted to the movable plate (11) at the bottom of the second platform (4). Limiting blocks (13) are provided on both sides of the movable plate (11). A limiting groove (14) adapted to the limiting block (13) is opened on the inner wall of the installation groove (12). The limiting block (13) can slide along the inside of the limiting groove (14) to realize the sliding and limiting of the support beam (1) and the second platform (4).

4. The retractable platform for a staggered balcony in a fourth-generation residential building as described in any one of claims 1-3, characterized in that, The rotating head (15) has a drive groove for external tools to drive it. The mechanical transmission reversing mechanism includes a rotating shaft (16), a worm (18), a worm wheel (20), a shaft (21), a driving bevel gear (23), a driven bevel gear (24), a rotating rod (25), a lead screw (27), and a threaded sleeve (28) that is threaded with the lead screw (27). The rotating head (15) is fixedly connected to the rotating shaft (16). The rotating shaft (16) transmits rotation to the lead screw (27) in sequence through the cooperation of the worm (18) and the worm wheel (20), and the cooperation of the driving bevel gear (23) and the driven bevel gear (24). The threaded sleeve (28) is connected to the second platform (4) for transmission.

5. The retractable platform for a staggered balcony in a fourth-generation residential building as described in claim 4, characterized in that, The lower end of the rotating shaft (16) is fixedly connected to the worm (18). The rotating shaft (16) is rotatably assembled inside the support beam (1) through the bearing (17). The lower end of the worm (18) is rotatably supported in the inner cavity of the support beam (1) through the bearing seat (19). The worm wheel (20) meshes with the worm (18). The worm wheel (20) is coaxially fixedly assembled with the shaft (21).

6. The retractable platform for a staggered balcony in a fourth-generation residential building as described in claim 5, characterized in that, The shaft (21) is fixedly provided with driving bevel gears (23) at both ends. The driving bevel gears (23) mesh with the driven bevel gears (24) one by one. The shaft (21) is rotatably installed in the inner cavity of the support beam (1) through the bushing (22). Each driven bevel gear (24) is fixedly connected to the rotating rod (25).

7. The retractable platform for a staggered balcony in a fourth-generation residential building as described in claim 6, characterized in that, The inner cavity of the support beam (1) is fixedly provided with a rotating frame (26), and the rotating rod (25) is rotatably assembled on the rotating frame (26). The rotating rod (25) is fixedly connected to the lead screw (27).

8. The retractable platform for a staggered balcony in a fourth-generation residential building as described in claim 7, characterized in that, The first platform (3) has a rectangular groove (29), and a limiting sleeve (31) is provided on the outside of the thread sleeve (28). The limiting sleeve (31) is slidably assembled inside the rectangular groove (29). The limiting sleeve (31) is used to restrict the thread sleeve (28) from rotating with the lead screw (27).

9. The retractable platform for a staggered balcony in a fourth-generation residential building as described in claim 8, characterized in that, A transmission rod (32) is provided between the limiting sleeve (31) and the second platform (4). The screw (27) rotates to drive the screw sleeve (28) to move axially along the screw (27), and the second platform (4) is driven to complete the telescopic movement through the limiting sleeve (31) and the transmission rod (32).

10. The retractable platform for a fourth-generation residential staggered balcony as described in claim 9, characterized in that, The drive slot at the top of the rotating head (15) is a hexagonal slot, which is adapted to a hexagonal wrench as an external drive tool.

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