A bed board expansion structure based on a roof lifting tent

Abstract

The present application relates to the technical field of roof lifting tent, and discloses a bed board expansion structure based on roof lifting tent, which comprises a base, a roof is installed on the base, a sliding support driving element is arranged between the roof and the base, a turnover bed board is installed on the side edge of the base, and the roof and the base are provided with locking assemblies and fixed connecting rod groups. The cross support rod group of the present application relies on the dynamic change of the structure form in the lifting process, realizes the double improvement of support stability and carrying capacity, has significant stress advantage, and the structure is in a compressible state when not lifted. With the roof rising, the sliding end of the receiving rod gradually moves to the middle and the whole tends to be vertical, the vertical included angle decreases and the horizontal included angle increases, so that the triangular support frame structure forms efficient axial stress characteristics, greatly weakens the bending moment effect and improves the compression resistance. After being lifted to the highest position, the structure combines the geometric form and the characteristics of the middle part of the sliding end, forms a natural stable structure, and can effectively resist longitudinal pressure and lateral eccentric load.

Description

Technical Field

[0001] This invention relates to the field of roof-mounted lift tent technology, specifically to a bed board extension structure based on a roof-mounted lift tent. Background Technology

[0002] With the rise of outdoor camping and other leisure activities, roof-mounted tents, as equipment to expand the carrying space of a car, have become popular among outdoor enthusiasts. Roof-mounted tents typically include a base, a height-adjustable roof, and a bed extension structure for expanding the resting space. The core requirement is to simultaneously achieve the stable unfolding and folding of the bed during the raising and lowering of the roof, so as to improve space utilization and ease of use.

[0003] However, the existing roof-mounted pop-up tent's bed extension structure still has many shortcomings, making it difficult to meet users' needs for reliability, convenience, and structural simplification: Firstly, in existing technologies, locking / unlocking of the bed board mostly relies on manual operation or a separate drive component. Both methods have obvious drawbacks. Manual operation requires the user to perform a series of actions such as bending over, aligning, and locking outdoors, which is cumbersome and time-consuming, especially in camping scenarios, which seriously affects the ease of use. Separate drive operation requires additional configuration of independent motors, control modules, and transmission structures, which not only significantly increases the number of parts and manufacturing costs, but is also prone to coordination failures with the roof lifting mechanism, leading to problems such as "the bed board flips before unlocking" and "the bed board lifts before locking," causing deformation of the lock body, misalignment of the bed board, or even jamming of the mechanism.

[0004] Secondly, during the initial lifting phase, the concentrated load can easily cause overcurrent damage. The electric actuator needs to overcome the entire weight of the ceiling, bed board, and other components at once, while also breaking through the static friction between the mechanisms. This results in a surge in the peak load at startup, which can easily lead to overcurrent burnout of the electric actuator and damage to the motor coil.

[0005] Third, the stability of the unfolded bed board is insufficient. Existing technologies mostly use a dead-point structure with gear and rack transmission to try to fix the unfolded bed board. However, this structure has significant defects: the dead-point structure is a passive and temporary stabilization, which can only achieve balance at a specific angle. When subjected to external forces such as vehicle vibration, wind force or people turning over, it is very easy to move out of the dead-point position, causing the bed board to shake or even accidentally flip over, which poses a safety hazard.

[0006] Fourth, the maintenance is inconvenient. Most solutions do not consider emergency handling mechanisms after electric unlocking failure. Once the sliding support drive component fails and cannot be unlocked electrically, it can only be repaired by force disassembly, which can easily cause secondary damage to the components.

[0007] Therefore, this invention proposes a bed board extension structure based on a roof-mounted lifting tent. Summary of the Invention

[0008] The purpose of this invention is to provide a bed board extension structure based on a roof-mounted lift tent, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a bed board extension structure based on a roof-mounted lifting tent, comprising a base, a canopy installed on the base, a sliding support drive component between the canopy and the base, a flip-up bed board installed on the side of the base, a locking assembly and a fixing linkage assembly installed on the canopy and the base, and a bed board support component provided on the flip-up bed board; When the sliding support drive component drives the canopy to rise, it simultaneously drives the locking components on the base and the canopy to separate and unlock. At the same time, the rise of the canopy drives the fixed linkage group to unfold and rotate. Through the linkage of the fixed linkage group, the flip bed board is flipped and unfolded. After the flip bed board is fully unfolded, the bed board support component automatically swings down based on its own gravity and forms a locking limit with the base.

[0010] Preferably, the sliding support drive is a scissor lift mechanism, and an electric push rod is mounted on the sliding support drive. The electric push rod serves as the drive component of the scissor lift mechanism, driving its overall extension and retraction to lift the ceiling.

[0011] Preferably, the locking assembly includes two hinged connecting plates, which are respectively hinged to both sides of the base. Each hinged connecting plate is provided with two movable locking seats. The top is provided with fixed locking seats that match the number of movable locking seats. The two movable locking seats on the same hinged connecting plate are engaged in opposite directions. The movable locking seats on the other hinged connecting plate of the base are engaged in the opposite direction to the movable locking seats on one hinged connecting plate.

[0012] Preferably, the base is provided with a guide rail, the guide rail is provided with a sliding groove, the locking assembly further includes a locking link, the locking link is connected to the electric push rod, and the locking link is linked to both hinged connecting plates; When the electric push rod extends, it drives the locking link to move along the slide groove of the guide rail, thereby driving the two hinged connecting plates to rotate around the hinge point between themselves and the base, and simultaneously driving each movable lock seat to flip, so that the locking end of the movable lock seat disengages from the fixed lock seat to achieve unlocking. When the electric push rod retracts, it drives the locking link to move in the opposite direction along the slide groove, driving the movable lock seat to flip and engage with the fixed lock seat to achieve locking.

[0013] Preferably, the bed board support includes a fixed plate, a movable plate, and a connecting shaft. The bottom of the flip-up bed board has a groove, the fixed plate is fixed to the bottom of the groove, one end of the movable plate is hinged to the fixed plate, and the other end is fixedly connected to an auxiliary rod. The connecting shaft is hinged to the surface of the fixed plate and is located away from the end of the movable plate that is hinged to the fixed plate. The other end of the connecting shaft has a slot, and the auxiliary rod slides within the slot.

[0014] Preferably, when the flip bed board is flipped to 90°, the bed board support remains in a retracted state. When the flip bed board continues to flip to 180° and is fully unfolded, the movable board swings down around the connecting shaft based on its own weight, and its free end engages with the edge of the base for support. When the flipping bed board is retracted, the movable plate remains in a supported state during the reverse flipping to 90°. When it continues to flip back to the initial position, the movable plate is limited by the base or the flipping bed board, and closes around the connecting shaft and is stored in the groove.

[0015] Preferably, there are two guide rails, which are respectively installed on the base and the top, and the guide rails are fixed by screws through round holes and gourd holes.

[0016] Preferably, the sliding support drive component further includes an outer fork arm, an inner fork arm, and a starting rod. The outer fork arm and the inner fork arm are cross-hinged to form a scissor fork core. The lower end of the electric push rod is driven by a shaft and a guide rail on the base side. The upper end is hinged to the starting rod, and the middle part of the starting rod is hinged to the outer fork arm and the inner fork arm respectively. The inner fork arm slides in a groove on the guide rail on the base side via a shaft, and the outer fork arm slides in a groove on the guide rail on the roof side via a shaft. When the electric push rod extends or retracts, it drives the outer fork arm and the inner fork arm to slide relative to each other along the groove of the corresponding guide rail via a starter rod.

[0017] Preferably, the fixed linkage group includes an upper linkage and a lower linkage. One end of the upper linkage is hinged to the ceiling, and the other end is hinged to the lower linkage. The end of the lower linkage away from the upper linkage is hinged to a bed board connector. The bed board connector is linked to the tilting bed board. Slide rails are installed on the base and the ceiling.

[0018] Preferably, the fixed linkage group further includes a positioning rod, the top of which is hinged to the lower linkage, and the lower end of which is hinged to a slide block, which is slidably connected to the slide rail.

[0019] Preferably, the outer fork arm and the inner fork arm are provided with waist-shaped grooves, which are used to limit the rotation angle of the starting rod to 21°. The starting rod is equipped with a bearing. In the initial stage of the sliding support drive component rising, the bearing contacts the guide rail on the base side and provides support force to prevent the electric push rod from overcurrent. After the starting rod is disengaged from the guide rail, the bearing stops providing support.

[0020] Preferably, when the lower connecting rod rotates 82.6° around its own hinge point, it drives the flipping bed board to rotate 180° synchronously through the bed board connector to achieve full unfolding. The positioning rod rotates with the lower connecting rod, pulls the slide block to slide 375mm to the right along the guide rail groove and then locks. The positioning rod, the lower connecting rod and the base form a triangular stable structure to balance the pressure of the ceiling on the fixed connecting rod assembly.

[0021] Preferably, when the sliding support drive component fails and cannot be electrically unlocked, the screw at the guide rail hole is loosened, and the guide rail on the base side is pushed to move along the direction of the large hole of the gourd hole, which simultaneously drives the outer fork arm, inner fork arm and locking linkage to move, driving the movable lock seat to flip and disengage from the fixed lock seat, thereby achieving manual unlocking and facilitating disassembly and maintenance.

[0022] Preferably, when the electric push rod extends to unlock, it drives the hinge plate to move through the locking link, thereby driving the front movable lock seat to rotate clockwise around the hinge point and the rear movable lock seat to rotate counterclockwise around the hinge point. The electric push rod has a travel of 30mm to ensure that all movable lock seats are completely disengaged from the fixed lock seat.

[0023] Preferably, the electric push rod can provide a driving force of 9000N when it extends or retracts.

[0024] Preferably, the fixed linkage group further includes a cross support rod group, which is installed between the ceiling and the base. The cross support rod group includes four supporting rods, which are hinged to each other at the middle of each pair to form a symmetrical triangular support structure. The ends of the triangular support structure are provided with four connecting ends. Of the two upper connecting ends, one is hinged to the ceiling and the other is slidably connected to the slide rail of the ceiling. Of the two lower connecting ends, one is hinged to the base and the other is slidably connected to the slide rail of the base.

[0025] Compared with the prior art, the beneficial effects of the present invention are: 1. The cross-support rod assembly of the present invention relies on the dynamic changes in structural form during the lifting process to achieve a dual improvement in support stability and load-bearing capacity, and has significant stress advantages. When not raised, the structure is in a compressible state. As the ceiling rises, the sliding end of the supporting rod gradually moves towards the center and the whole becomes closer to vertical. The vertical angle decreases and the horizontal angle increases, so that the triangular support frame structure forms an efficient axial force characteristic, greatly weakening the bending moment effect and improving the compression resistance. After being raised to the highest position, the structure, combined with the geometric shape and the central arrangement of the sliding end, forms a naturally stable structure that can effectively resist longitudinal pressure and lateral eccentric load. At the same time, the multi-level triangular structure evenly distributes the ceiling load, avoiding local stress concentration. This not only prevents the ceiling from tilting, but also provides stable support for the flip-up bed board, ensuring that the structure does not shake or collapse when multiple people use it or when carrying heavy objects, significantly improving the overall load-bearing performance and safety of use.

[0026] 2. This invention utilizes an integrated locking and linkage design, namely an integrated linkage structure of electric push rod, locking link, and hinged connecting plate, to achieve fully automated linkage of one-button start-up-stroke unlocking-continue stroke lifting-synchronous bed board flipping-locking in place. No step-by-step operation or additional power source is required. This design is not redundant, but rather a necessity for adapting to the needs of outdoor single-person and dynamic linkage scenarios for rooftop tents. It not only greatly improves the convenience of camping use, but also avoids the technical risk of lifting or lowering without unlocking through segmented stroke design. Compared with a separate electric mechanical lock, it achieves a fundamental improvement in scenario adaptability and security.

[0027] 3. This invention constructs a complete linkage closed loop of start-up-unlock-lifting-flipping-locking-fault repairability. Unlocking is the prerequisite for lifting, and locking is the inevitable result of flipping the panel into position. Each action is driven by a single electric push rod without additional control modules, forming a logically self-consistent transmission system. This further realizes the upgrade from single linkage between functions to a full-process closed loop, greatly improving ease of use and scenario adaptability.

[0028] 4. This invention addresses the industry pain point of overcurrent damage to the electric push rod during the initial lifting phase by optimizing the precise limiting and support of the scissor lift mechanism. Existing scissor lift mechanisms suffer from poor initial force distribution when the scissor arm retracts, requiring the electric push rod to overcome the full load and static friction in one go, which easily leads to overcurrent burnout. Furthermore, the lack of trajectory limiting causes lifting deviations. This solution adds a starting rod with a waist-shaped groove between the scissor core and the electric push rod, precisely limiting the rotation angle to 21°. Simultaneously, a bearing is configured to provide initial support. During the initial lifting phase, the bearing contacts the guide rail to share the load, preventing overcurrent in the electric push rod. Once the mechanism achieves stable force, it disengages from the support. This design is not a simple stacking of conventional structures but an innovative optimization addressing the problem of concentrated load during the initial lifting phase. Through the integrated application of conventional bearings and limiting structures, dual protection against overcurrent and precise trajectory is achieved, protecting the electric push rod from damage and improving lifting synchronization. Compared to designs without protection, this significantly improves the reliability and service life of the mechanism.

[0029] 5. This invention solves the defects of existing dead-point structures, which are passively stable and prone to shaking, by integrating a triangular stabilizing structure with the bed board. Existing technologies mostly use gear and rack transmission to fix the bed board with a dead-point structure, which can only be passively stable at a specific angle. It is easy to break away from the dead point under external force, resulting in safety hazards. Moreover, the outdoor environment can easily cause wear and jamming of the gear surface. This invention forms a triangular stabilizing structure with the positioning rod, lower connecting rod and base. It is not a simple application of conventional static brackets, but is deeply linked with the bed board flipping transmission. When the lower connecting rod rotates 82.6°, it drives the bed board to unfold 180° precisely. At the same time, the positioning rod pulls the slide to slide 375mm and then locks, forming a dynamic linkage lock. The inherent stability of the triangular structure can balance the pressure of the ceiling and prevent the bed board from shaking. At the same time, it avoids the high requirements of gear and rack transmission for meshing accuracy and is suitable for outdoor sand and rain environments. Compared with the dead-point structure, it realizes the upgrade from "passive temporary stability" to "active dynamic stability" and ensures the reliability of the support after the bed board is unfolded.

[0030] 6. This invention solves the problems of inability to unlock and cumbersome maintenance after a failure in existing technologies by integrating a guide rail with a "round hole + gourd hole". It also addresses the shortcomings of existing standalone electric locks and linkage schemes in terms of fault redundancy. Existing solutions often do not consider emergency handling for electric unlocking failures, requiring forced disassembly after a failure, which can lead to secondary damage. Standalone electric mechanical locks also lack an emergency unlocking mechanism. This solution integrates a round hole and a gourd hole on the guide rail for secure fixing. During normal use, the round hole provides precise positioning. In case of a failure, loosening the screw in the round hole and pushing the guide rail along the large hole of the gourd hole will trigger the linkage locking rod to unlock, enabling convenient disassembly even in the absence of power. This design is not an additional redundant structure, but an innovative optimization based on the needs of outdoor maintenance scenarios. It provides the device with dual protection of electric unlocking and manual emergency unlocking, solving maintenance pain points not covered by existing technologies and significantly improving the practicality and market adaptability of the device.

[0031] 7. This invention, through a "single electric push rod + multi-link integrated" design, uses a single power source to achieve simultaneous unlocking, lifting, flipping, and locking actions. This reduces the need for additional motors, control modules, and other parts, simplifying the transmission structure. Furthermore, each integrated structure is designed to address specific pain points, such as linkage locking for convenience, overcurrent protection for reliability, and emergency unlocking for maintenance. This creates a virtuous cycle of functional integration, structural simplification, cost reduction, and improved reliability. Compared to existing multi-power source solutions, this solution improves overall performance while reducing manufacturing and maintenance costs, demonstrating significant economic value and market competitiveness, and fully proving the creativity and necessity of the integrated design. Attached Figure Description

[0032] Figure 1 This is a frontal perspective three-dimensional schematic diagram of the main structure of the present invention.

[0033] Figure 2 This is a three-dimensional disassembly diagram of the main structure of the present invention.

[0034] Figure 3 This is a three-dimensional schematic diagram of the cooperation relationship between the locking link and the electric push rod in Embodiment 1 of the present invention.

[0035] Figure 4 This is a three-dimensional schematic diagram showing the positional relationship between the movable lock seat and the fixed lock seat in Embodiment 1 of the present invention.

[0036] Figure 5 This is a partial three-dimensional schematic diagram of the movement path of the movable lock seat in Embodiment 1 of the present invention.

[0037] Figure 6 This is a plan view of the bed board support in Embodiment 1 of the present invention.

[0038] Figure 7 This is a three-dimensional schematic diagram of the unfolded state changes of the bed board support in Embodiment 1 of the present invention.

[0039] Figure 8 This is a plan view of the bed board support member in its unfolded state according to Embodiment 1 of the present invention.

[0040] Figure 9 This is a three-dimensional schematic diagram of the fixed connecting rod assembly in Embodiment 3 of the present invention.

[0041] Figure 10 For the present invention Figure 9 Enlarged 3D structural diagram at point A.

[0042] Figure 11 This is a plan view of the fixed linkage assembly in the retracted state in Embodiment 3 of the present invention.

[0043] Figure 12 This is a plan view of the fixed connecting rod assembly in the deployed state in Embodiment 3 of the present invention.

[0044] Figure 13 This is a planar schematic diagram of the positions of the gourd-shaped hole and the round hole in Embodiment 4 of the present invention.

[0045] Figure 14 This is a planar schematic diagram of the gourd hole, the round hole, and the locking rod in Embodiment 4 of the present invention.

[0046] Figure 15 This is a frontal perspective three-dimensional schematic diagram of the main structure in Embodiment 5 of the present invention.

[0047] In the picture: 1. Base; 2. Canopy; 3. Guide rail; 31. Hoist hole; 4. Sliding support drive component; 41. Outer fork arm; 42. Inner fork arm; 43. Electric push rod; 44. Start rod; 5. Locking assembly; 51. Locking connecting rod; 52. Hinge connecting plate; 53. Moving lock seat; 54. Fixed lock seat; 6. Flipping bed board; 61. Bed board support component; 611. Fixed plate; 612. Movable plate; 613. Connecting shaft; 7. Fixed connecting rod assembly; 71. Upper connecting rod; 72. Lower connecting rod; 721. Bed board connecting component; 73. Positioning rod; 74. Cross support rod assembly; 741. Support rod. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0049] Example 1, as Figure 1 As shown, a bed board extension structure based on a roof-mounted lifting tent includes a base 1, a canopy 2 installed on the base 1, a sliding support drive 4 between the canopy 2 and the base 1, a flip-up bed board 6 installed on the side of the base 1, a locking assembly 5 and a fixing linkage 7 installed on the canopy 2 and the base 1, and a bed board support 61 provided on the flip-up bed board 6. When the sliding support drive component 4 drives the canopy 2 to rise, it simultaneously drives the base 1 to separate and unlock from the locking component 5 on the canopy 2. At the same time, the rise of the canopy 2 drives the fixed linkage group 7 to unfold and rotate. Through the linkage group 7, the flip bed board 6 is flipped and unfolded. After the flip bed board 6 is fully unfolded, the bed board support component 61 automatically swings down based on its own gravity and forms a locking limit with the base 1.

[0050] like Figure 1 and Figure 2 As shown, the sliding support drive component 4 is a scissor lift mechanism. An electric push rod 43 is mounted on the sliding support drive component 4. The electric push rod 43 serves as the drive component of the scissor lift mechanism, driving its overall extension and retraction to lift the ceiling 2.

[0051] like Figure 2 and Figure 4As shown, the locking assembly 5 includes two hinged connecting plates 52, which are respectively hinged to both sides of the base 1. Each hinged connecting plate 52 is provided with two movable locking seats 53. The top 2 is provided with fixed locking seats 54 that match the number of movable locking seats 53. The two movable locking seats 53 on the same hinged connecting plate 52 are engaged in opposite directions. The movable locking seats 53 on the other side of the base 1 are engaged in the opposite direction to the movable locking seats 53 on one side of the hinged connecting plate 52.

[0052] like Figure 3 As shown, the base 1 is provided with a guide rail 3, and the guide rail 3 is provided with a sliding groove. The locking assembly 5 also includes a locking rod 51, which is connected to the electric push rod 43. The locking rod 51 is also linked to the two hinged connecting plates 52. When the electric push rod 43 extends, it drives the locking rod 51 to move along the slide groove of the guide rail 3, thereby driving the two hinged connecting plates 52 to rotate around their own hinge points with the base 1, and simultaneously driving each movable lock seat 53 to flip, so that the engaging end of the movable lock seat 53 disengages from the fixed lock seat 54 to achieve unlocking. When the electric push rod 43 retracts, it drives the locking link 51 to move in the opposite direction along the slide groove, which drives the movable lock seat 53 to flip and engage with the fixed lock seat 54 to achieve locking.

[0053] like Figures 6 to 8 As shown, the bed board support 61 includes a fixed plate 611, a movable plate 612, and a connecting shaft 613. The bottom of the flip bed board 6 has a groove, and the fixed plate 611 is fixed to the bottom of the groove. One end of the movable plate 612 is hinged to the fixed plate 611, and the other end is fixedly connected to an auxiliary rod. The connecting shaft 613 is hinged to the surface of the fixed plate 611 and is located away from the end of the movable plate 612 that is hinged to the fixed plate 611. The other end of the connecting shaft 613 has a slot, and the auxiliary rod slides in the slot. When the flip bed board 6 is flipped to 90°, the bed board support 61 remains in a retracted state. When the flip bed board 6 continues to flip to 180° and is fully unfolded, the movable plate 612 swings down around the connecting shaft 613 based on its own weight, and its free end engages with the edge of the base 1 for support. When the flip bed board 6 is retracted, the movable plate 612 remains in a supported state during the reverse flipping to 90°. When it continues to flip back to the initial position, the movable plate 612 is limited by the base 1 or the flip bed board 6, and closes around the connecting shaft 613 and is stored in the groove.

[0054] It should be noted that there are two guide rails 3, which are installed on the base 1 and the top 2 respectively.

[0055] like Figure 5As shown, when the electric push rod 43 extends to unlock, it drives the hinge plate 52 to move through the locking link 51, thereby driving the front movable lock seat 53 to rotate clockwise around the hinge point and the rear movable lock seat 53 to rotate counterclockwise around the hinge point. The travel of the electric push rod 43 is 30mm, ensuring that all movable lock seats 53 are completely disengaged from the fixed lock seat 54.

[0056] It should be noted that the electric actuator 43 can provide a driving force of 9000N when it extends or retracts.

[0057] Specifically, in the initial state, the canopy 2 and the base 1 are tightly locked together by the locking assembly 5, the flip bed board 6 is in the storage state, and the bed board support 61 is stored in the bottom groove of the flip bed board 6.

[0058] When it needs to be unfolded, the electric push rod 43 is activated and extended. As the driving component of the scissor lift mechanism, it first completes the unlocking action: the electric push rod 43 extends 30mm, driving the locking link 51 to move along the slide groove of the guide rail 3 on the side of the base 1, thereby driving the hinged connecting plates 52 on both sides of the base 1 to rotate around their own hinge points.

[0059] Since the movable lock seats 53 on the same hinge plate 52 are engaged in opposite directions, and the movable lock seats 53 on both sides of the hinge plate 52 are arranged in opposite directions, during the rotation, the front movable lock seat 53 rotates clockwise and the rear movable lock seat 53 rotates counterclockwise, and simultaneously disengages from the fixed lock seat 54 on the ceiling 2 to achieve unlocking.

[0060] This hinged linkage + reverse locking seat design has significant advantages. Under normal conditions, the four movable locking seats 53 engage bidirectionally with the fixed locking seat 54 from opposite directions, forming a double locking effect. This effectively resists vibrations and external impacts during vehicle operation, avoids accidental locking, and greatly improves the reliability and structural stability of the locking state.

[0061] After unlocking, the electric push rod 43 continues to extend, outputting 9000N of driving force to drive the scissor mechanism of the sliding support drive component 4 to extend and retract, pushing the canopy 2 to rise smoothly, and thus driving the sliding support drive component 4 to rise synchronously with the canopy 2.

[0062] During the ascent of the canopy 2, the fixed linkage group 7 unfolds and rotates, driving the tilting bed board 6 on the side of the base 1 to gradually tilt through the linkage.

[0063] When the flip bed board 6 is flipped to 90°, the bed board support 61 remains in the retracted state; when it is flipped to 180° and fully unfolded, the movable plate 612 of the bed board support 61 swings down around the connecting shaft 613 based on its own weight, the auxiliary rod slides along the groove of the connecting shaft 613, and the free end of the movable plate 612 engages with the edge of the base 1 to form a stable support.

[0064] During recovery, the electric push rod 43 retracts in the reverse direction, the scissor lift mechanism closes, the canopy 2 slowly descends, and the fixed linkage group 7 drives the flipping bed board 6 to flip in the reverse direction.

[0065] During the process of the flip bed board 6 flipping in the opposite direction to 90°, the bed board support 61 remains in a supported state; when it continues to flip back to the initial position, the movable plate 612 is limited by the base 1 or the flip bed board 6, and closes around the connecting shaft 613 and is stored in the groove.

[0066] Finally, the electric push rod 43 retracts another 30mm, causing the locking link 51 to move in the opposite direction, driving the movable lock seat 53 to flip and reset, engaging with the fixed lock seat 54, completing the locking and restoring the initial state.

[0067] Example 2, as Figure 2 As shown, the sliding support drive component 4 also includes an outer fork arm 41, an inner fork arm 42 and a starting rod 44. The outer fork arm 41 and the inner fork arm 42 are cross-hinged to form the scissor fork core. The lower end of the electric push rod 43 is driven by the guide rail 3 on the side of the base 1 through the shaft, and the upper end is hinged to the starting rod 44. The middle part of the starting rod 44 is hinged to the outer fork arm 41 and the inner fork arm 42 respectively. The inner fork arm 42 slides in a groove on the guide rail 3 on the side of the base 1 via a shaft, and the outer fork arm 41 slides in a groove on the guide rail 3 on the side of the canopy 2 via a shaft. When the electric push rod 43 extends or retracts, it drives the outer fork arm 41 and the inner fork arm 42 to slide relative to each other along the groove of the corresponding guide rail 3 via the start rod 44.

[0068] like Figure 2 As shown, the outer fork arm 41 and the inner fork arm 42 are provided with waist-shaped grooves. The waist-shaped grooves are used to limit the rotation angle of the starting rod 44 to 21°. The starting rod 44 is equipped with a bearing. In the initial stage of the sliding support drive 4 rising, the bearing contacts the guide rail 3 on the side of the base 1 and provides support force to prevent the electric push rod 43 from overcurrent. After the starting rod 44 is disengaged from the guide rail 3, the bearing stops supporting.

[0069] Specifically, when the electric push rod 43 extends, it drives the outer fork arm 41 and the inner fork arm 42 to slide relative to each other along the corresponding guide rail 3 through the starter rod 44. The scissor fork core gradually unfolds, driving the canopy 2 to rise smoothly. When the electric push rod 43 retracts, the scissor fork core closes, and the canopy 2 falls accordingly.

[0070] The overcurrent protection design is a key advantage of this embodiment. The waist-shaped grooves on the outer fork arm 41 and the inner fork arm 42 strictly limit the rotation angle of the starter lever 44 to 21°, ensuring accurate movement trajectory.

[0071] In the initial stage of ascent, the bearing on the starting rod 44 contacts the guide rail 3 on the side of the base 1 and provides support force, effectively sharing the initial load of the electric push rod 43 and preventing it from overloaded due to excessive instantaneous force.

[0072] Once the starting lever 44 rotates to the limit angle and disengages from the guide rail 3, the bearing stops supporting it. At this point, the scissor mechanism has reached a stable force state, and the electric push rod 43 can drive the lifting normally. This not only protects the push rod from damage but also improves the stability and reliability of the lifting process.

[0073] Example 3, as Figures 9 to 12 As shown, the fixed linkage group 7 includes an upper linkage 71 and a lower linkage 72. One end of the upper linkage 71 is hinged to the ceiling 2, and the other end is hinged to the lower linkage 72. The end of the lower linkage 72 away from the upper linkage 71 is hinged to the bed board connector 721. The bed board connector 721 is linked with the flip bed board 6. Slide rails are installed on the base 1 and the ceiling 2.

[0074] It should be noted that the fixed linkage group 7 also includes a positioning rod 73. The top of the positioning rod 73 is hinged to the lower linkage 72, and the lower end of the positioning rod 73 is hinged to a slide block, which is slidably connected to the slide rail.

[0075] It should be added that when the lower connecting rod 72 rotates 82.6° around its own hinge point, it drives the flipping bed board 6 to rotate 180° synchronously through the bed board connector 721 to achieve full unfolding. The positioning rod 73 rotates with the lower connecting rod 72, pulls the slide block to slide 375mm to the right along the guide rail 3 and then locks. The positioning rod 73, the lower connecting rod 72 and the base 1 form a triangular stable structure to balance the pressure of the canopy 2 on the fixed connecting rod group 7.

[0076] Specifically, in the initial state, the fixed linkage group 7 is in a retracted state, and the flip-up bed board 6 is stored on the side of the base 1.

[0077] When the canopy 2 rises with the sliding support drive component 4, it will drive one end of the upper connecting rod 71 to rise synchronously. The upper connecting rod 71 rotates around its own hinge point and drives the lower connecting rod 72 to move in tandem. The lower connecting rod 72 gradually rotates around its own hinge point.

[0078] When the current connecting rod 72 rotates to an angle of 82.6°, power is transmitted through the bed board connector 721 at the end hinge, causing the flipping bed board 6 to rotate synchronously 180° around the rotation point, thus completing the full unfolding of the bed board.

[0079] During this process, the positioning rod 73, which is hinged to the lower connecting rod 72, rotates synchronously, and the slide block hinged to its lower end slides 375mm to the right along the slide groove of the guide rail 3 on the side of the base 1 and then locks.

[0080] After the slide is locked, the positioning rod 73, the lower connecting rod 72 and the base 1 form a stable triangular structure.

[0081] Utilizing the inherent stability of a triangle, this structure can effectively balance the pressure transmitted from the canopy 2 to the lower link 72 via the upper link 71, preventing the canopy 2 from tilting, while providing reliable support for the unfolded flip-up bed board 6, ensuring structural stability during use.

[0082] Example 4, as Figure 13 and Figure 14 As shown, the guide rail 3 is fixed by screws through the round hole and the hoist hole 31. When the sliding support drive component 4 fails and cannot be unlocked electrically, the screws at the round hole of the guide rail 3 are loosened, and the guide rail 3 on the side of the base 1 is pushed to move along the direction of the large hole of the hoist hole 31. At the same time, the outer fork arm 41, the inner fork arm 42 and the locking rod 51 are moved, driving the movable lock seat 53 to flip and disengage from the fixed lock seat 54, realizing manual unlocking, which is convenient for disassembly and maintenance.

[0083] Specifically, in the initial state, the guide rail 3 is firmly fixed by screws through the round hole and the gourd hole 31. The round hole serves as the installation reference point to ensure the stability of the guide rail 3. The narrow slot of the gourd hole 31 is locked with screws to prevent the guide rail 3 from shifting during device operation.

[0084] When the sliding support drive component 4 fails and cannot be electrically unlocked, the manual maintenance procedure is initiated: first loosen the fixing screw at the round hole of the guide rail 3 to release the reference limit of the guide rail 3.

[0085] Then push the guide rail 3 on the side of the base 1 to move it along the direction of the large hole of the gourd hole 31. The large hole design of the gourd hole 31 provides sliding space for the screw, avoiding the screw from blocking the movement of the guide rail 3.

[0086] When the guide rail 3 moves, it simultaneously drives the outer fork arm 41, the inner fork arm 42, and the locking link 51 that is linked with the electric push rod 43 to move together.

[0087] During the movement of the locking linkage 51, the hinged connecting plates 52 on both sides of the base 1 are driven to rotate, which in turn causes the movable lock seat 53 to flip and disengage from the fixed lock seat 54 of the roof 2, thus enabling manual unlocking.

[0088] After unlocking, the canopy 2 separates from the base 1 and the sliding support drive component 4, allowing for easy disassembly and maintenance, effectively solving the maintenance problem of not being able to unlock when malfunctioning.

[0089] Example 5, based on Example 3, such as Figure 15As shown, the fixed linkage group 7 also includes a cross support rod group 74, which is installed between the ceiling 2 and the base 1. The cross support rod group 74 includes four support rods 741, which are hinged to each other in the middle of each pair to form a symmetrical triangular support structure. The ends of the triangular support structure are provided with four connecting ends. Of the two upper connecting ends, one is hinged to the ceiling 2 and the other is slidably connected to the slide rail of the ceiling 2. Of the two lower connecting ends, one is hinged to the base 1 and the other is slidably connected to the slide rail of the base 1.

[0090] Specifically, in the initial state, the fixed linkage group 7 is in a retracted state, the flip bed board 6 is stored on the side of the base 1, the two sets of upper and lower symmetrical triangular support structures of the cross support rod group 74 are in a retracted and close-fitting state, the four support rods 741 are close to each other, and each sliding connection end is located at the initial position of the corresponding slide rail.

[0091] When the canopy 2 rises with the sliding support drive component 4, it will synchronously drive one end of the upper connecting rod 71 to move upward. The upper connecting rod 71 rotates around the hinge point with the canopy 2 and drives the lower connecting rod 72 to rotate in conjunction, so that the lower connecting rod 72 gradually rotates around its own hinge point.

[0092] As the lower connecting rod 72 rotates, the bed board connector 721 hinged at its end transmits power synchronously, causing the tilting bed board 6 to slowly tilt around the rotation point. When the rotation angle of the lower connecting rod 72 reaches 82.6°, the tilting bed board 6 completes a 180° synchronous rotation, achieving full unfolding and becoming flush with the top surface of the canopy 2. During this process, the cross support rod group 74 moves synchronously as the distance between the canopy 2 and the base 1 increases: the supporting rods 741 in the two sets of triangular support structures rotate relative to each other around the central hinge point. Of the two upper connecting ends, the end slidably connected to the slide rail of the canopy 2 moves smoothly along the slide rail, while the hinged end maintains a fixed angle with the canopy 2; of the two lower connecting ends, the end slidably connected to the slide rail of the base 1 slides synchronously along the slide rail, while the hinged end remains relatively fixed with the base 1.

[0093] When the flip bed board 6 is fully unfolded, the triangular support structure of the cross support rod group 74 is at its maximum opening angle. From the perspective of force characteristics, the structure shows a clear stability trend during the lifting process: when not raised, the distance between the hinge point and the sliding end of the adjacent support rod 741 is large, and the sliding end is close to the base 1, making the structure easy to compress; as the roof 2 is raised, the sliding end gradually moves away from the base 1, the vertical angle continuously decreases, the horizontal angle continuously increases, and at the same time, the sliding end of the support rod 741 moves from the end to the middle, and the overall posture is closer to the vertical state.

[0094] This change in posture and position creates a significant force advantage: when the structure is raised to its highest position, the support rod 741 is arranged almost vertically, and the sliding end is located in the middle of the structure, forming a force characteristic similar to a "vertical component". The component in the vertical state has extremely high resistance to axial compression. Just like a paper cup placed vertically is less likely to deform than one placed horizontally, the core principle is that the force path in the vertical direction is more direct, the bending moment effect is greatly weakened, and the axial bearing capacity is significantly improved.

[0095] At this point, the cross-bracing rod group 74, with its geometric shape of minimum vertical angle and maximum horizontal angle, combined with the central arrangement of the sliding end, forms a natural geometric self-locking effect. External forces cannot compress or deform it further, effectively resisting longitudinal pressure and lateral load. At the same time, the multi-level triangular support structure disperses the load transmitted by the ceiling 2, avoiding local force concentration. This not only prevents the ceiling 2 from tilting, but also provides uniform and stable support for the unfolded flip-up bed board 6, ensuring that the structure does not shake or collapse during use, and greatly improving the overall load-bearing capacity and safety of use.

[0096] The core difference between Embodiment 3 and Embodiment 5 lies in the support structure of the fixed link group 7. Embodiment 3 forms a triangular stable structure with the positioning rod 73, the lower link 72, and the base 1. It achieves single-point positioning support by relying on the inherent stability of the triangle. The structure is simpler, with fewer parts, lower assembly difficulty, and relatively controllable cost.

[0097] In Example 5, the positioning rod 73 is replaced by a cross support rod group 74. The bidirectional linkage support between the canopy 2 and the base 1 is achieved through a symmetrical triangular support structure. The stress points are more dispersed, and the anti-tilting and anti-deformation capabilities are stronger.

[0098] In terms of applicable scenarios, Embodiment 3 is suitable for scenarios with low requirements for lightweight equipment, low usage frequency, and moderate load-bearing requirements, such as small car roof tents and short-distance self-driving camping. Its simple structure can meet basic usage needs while controlling manufacturing costs. Embodiment 5 is more suitable for large car roof tents, long-term outdoor camping, or scenarios where multiple people use them together, especially in windy, uneven terrain, or situations where frequent unfolding and storage are required. The bidirectional support characteristics of the cross support rod group 74 can provide more reliable structural stability, avoid the problem of component deformation or support failure after long-term use, and adapt to higher intensity usage requirements.

[0099] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0100] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bed extension structure based on a roof-mounted lift tent, comprising a base (1), a canopy (2) mounted on the base (1), a sliding support drive (4) provided between the canopy (2) and the base (1), and a flip-up bed board (6) mounted on the side of the base (1), characterized in that: The canopy (2) and the base (1) are equipped with locking components (5) and fixing linkages (7), and the flip bed board (6) is provided with bed board support (61). When the sliding support drive (4) drives the canopy (2) to rise, it simultaneously drives the base (1) to separate and unlock the locking assembly (5) on the canopy (2). At the same time, the rise of the canopy (2) drives the fixed linkage group (7) to unfold and rotate. Through the linkage group (7), the flip bed board (6) is flipped and unfolded. After the flip bed board (6) is fully unfolded, the bed board support (61) automatically swings down based on its own gravity and forms a locking limit with the base (1). The sliding support drive (4) is a scissor lift mechanism. An electric push rod (43) is mounted on the sliding support drive (4). The electric push rod (43) serves as the drive component of the scissor lift mechanism, driving its overall extension and retraction to lift the ceiling (2). The locking assembly (5) includes two hinged connecting plates (52), which are respectively hinged to both sides of the base (1). Each hinged connecting plate (52) is provided with two movable locking seats (53). The canopy (2) is provided with fixed locking seats (54) that match the number of movable locking seats (53). The two movable locking seats (53) on the same hinged connecting plate (52) are engaged in opposite directions. The movable locking seats (53) on the other side of the hinged connecting plate (52) of the base (1) are engaged in opposite directions to the movable locking seats (53) on one side of the hinged connecting plate (52). The base (1) is provided with a guide rail (3), and the guide rail (3) is provided with a sliding groove. The locking assembly (5) also includes a locking link (51). The locking link (51) is connected to the electric push rod (43) through a transmission. The lower end of the electric push rod (43) is connected to the guide rail (3) on the side of the base (1) through a shaft. The locking link (51) is also connected to the two hinged connecting plates (52) in a linkage. When the electric push rod (43) extends, it drives the locking rod (51) to move along the slide groove of the guide rail (3), thereby driving the two hinged connecting plates (52) to rotate around the hinge point between themselves and the base (1), and simultaneously driving each movable lock seat (53) to flip, so that the locking end of the movable lock seat (53) disengages from the fixed lock seat (54) to unlock. When the electric push rod (43) retracts, it drives the locking link (51) to move in the opposite direction along the slide groove, driving the movable lock seat (53) to flip and engage with the fixed lock seat (54) to achieve locking.

2. The bed board extension structure based on a roof-mounted lifting tent according to claim 1, characterized in that: The bed board support (61) includes a fixed plate (611), a movable plate (612), and a connecting shaft (613). The bottom of the flip bed board (6) is provided with a groove. The fixed plate (611) is fixed to the bottom of the groove. One end of the movable plate (612) is hinged to the fixed plate (611), and the other end is fixedly connected to an auxiliary rod. The connecting shaft (613) is hinged to the surface of the fixed plate (611) and is located away from the end of the movable plate (612) that is hinged to the fixed plate (611). The other end of the connecting shaft (613) is provided with a slot, and the auxiliary rod is slidably fitted in the slot.

3. The bed board extension structure based on a roof-mounted lifting tent according to any one of claims 1-2, characterized in that: There are two guide rails (3), which are installed on the base (1) and the canopy (2) respectively. The guide rails (3) are fixed by screws through the round holes and the gourd holes (31).

4. The bed board extension structure based on a roof-mounted lifting tent according to claim 3, characterized in that: The sliding support drive component (4) also includes an outer fork arm (41), an inner fork arm (42), and a starting rod (44). The outer fork arm (41) and the inner fork arm (42) are cross-hinged to form a scissor fork core. The upper end of the electric push rod (43) is hinged to the starting rod (44), and the middle part of the starting rod (44) is hinged to the outer fork arm (41) and the inner fork arm (42) respectively. The inner fork arm (42) slides in a groove on the guide rail (3) on the side of the base (1) via a shaft, and the outer fork arm (41) slides in a groove on the guide rail (3) on the side of the canopy (2) via a shaft. When the electric push rod (43) extends or retracts, the outer fork arm (41) and the inner fork arm (42) slide relative to each other along the groove of the corresponding guide rail (3) via the starter rod (44).

5. The bed board extension structure based on a roof-mounted lifting tent according to claim 1, characterized in that: The fixed linkage group (7) includes an upper linkage (71) and a lower linkage (72). One end of the upper linkage (71) is hinged to the ceiling (2), and the other end is hinged to the lower linkage (72). The lower linkage (72) is hinged to the bed board connector (721) at the end away from the upper linkage (71). The bed board connector (721) is linked to the flip bed board (6). Slide rails are installed on the base (1) and the ceiling (2).

6. The bed board extension structure based on a roof-mounted lifting tent according to claim 5, characterized in that: The fixed linkage group (7) also includes a positioning rod (73), the top of which is hinged to the lower linkage (72), and the lower end of which is hinged to a slide block, which is slidably connected to the slide rail.

7. The bed board extension structure based on a roof-mounted lifting tent according to claim 5, characterized in that: The fixed linkage group (7) also includes a cross support rod group (74), which is installed between the ceiling (2) and the base (1). The cross support rod group (74) includes four support rods (741), which are hinged to each other in the middle to form a symmetrical triangular support structure. The ends of the triangular support structure are provided with four connecting ends. Among the two upper connecting ends, one is hinged to the ceiling (2) and the other is slidably connected to the slide rail of the ceiling (2). Among the two lower connecting ends, one is hinged to the base (1) and the other is slidably connected to the slide rail of the base (1).

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