Manual floor extension ladder assembly

Abstract

The invention provides a manual landing extension ladder assembly, and relates to the technical field of extension ladder assemblies for fire fighting trucks. The manual landing extension ladder assembly comprises a fixed frame body, a sliding frame body, a turnover mechanism and an energy storage mechanism. The turnover mechanism comprises a linear moving part and a turnover part, and the linear moving part is arranged on the fixing frame body in a sliding mode. And the overturning part is rotationally connected with the linear moving part. The sliding frame body is arranged on the overturning part. The energy storage mechanism comprises a fixing block, a first sliding block, an outer sleeve, an inner column, an energy storage spring and a connecting rod. And the fixed block is arranged on the linear moving part. The inner column extends into the outer sleeve, and the first sliding block is fixedly arranged on the inner column in a sleeving mode. The energy storage spring is connected with the first sliding block and the fixing block. One end of the connecting rod is hinged to the overturning part, and a second sliding block is hinged to the other end of the connecting rod and arranged on the linear moving part in a sliding mode. The operation intensity and danger of taking and placing the long ladder can be reduced, so that the workload of workers is reduced, the safety is improved, and the taking and placing reliability and the taking and placing efficiency of the ladder are improved.

Description

Technical Field

[0001] This invention relates to the field of fire truck extension ladder technology, and more specifically, to a manual floor-mounted extension ladder. Background Technology

[0002] In firefighting, rescue, and some engineering operations, long-length (e.g., 15 meters and above) manually operated ground-mounted ladders (such as fire ladders) are core equipment for high-altitude rescue and climbing operations. These ladders are typically transported horizontally mounted on the roof of fire trucks or other specialized vehicles. Upon arrival at the work site, how to safely, quickly, and effortlessly transfer the heavy, large ladders from the vehicle roof to the ground and set them up has long been a difficult and challenging aspect of practical operation. Currently, there are two main retrieval and deployment solutions on the market, but both have significant drawbacks: The first method is a purely manual operation: relying entirely on multiple firefighters or workers to lift and carry the ladder off the vehicle and flip it to the ground. This method not only consumes a lot of manpower and time, contradicting the time-sensitive requirements of emergency rescue, but also poses extremely high safety risks. Due to the high center of gravity and heavy weight of the ladder, at the critical point of flipping from horizontal to vertical, uneven force or coordination errors can easily cause the ladder to slip uncontrollably and fall, causing serious injury to the operators and surrounding equipment.

[0003] The second type is the power-assisted mode: To reduce the burden of manpower, some solutions introduce electric, hydraulic, or pneumatic systems as power sources, combined with complex mechanical structures (such as telescopic arms and tilting arms) to achieve automatic or semi-automatic ladder retrieval and placement. While this type of solution reduces manpower requirements to some extent, it brings new systemic drawbacks: First, the cost is high, as the power system and precision mechanical structure significantly increase the purchase and maintenance costs of the equipment; second, reliability is challenged, especially under complex vibrations, high and low temperatures, and harsh working conditions on a vehicle, hydraulic systems are prone to leakage, pipe bursts, and valve jamming, pneumatic systems suffer from unstable pressure and leakage, and electric systems are limited by aging wiring, electrical control failures, and dependence on power sources; third, complex power systems mean heavier curb weight, larger installation space, and more cumbersome maintenance requirements, which contradicts the principles of high reliability, rapid response, and low maintenance costs in fire-fighting equipment.

[0004] In summary, existing technological solutions present a dilemma between "manual operation" and "power-assisted" systems: the former suffers from low safety and efficiency, while the latter faces bottlenecks in reliability, cost, and complexity. Therefore, the industry urgently needs an innovative solution that can significantly reduce the intensity and danger of retrieving and placing long ladders, thereby reducing worker workload and improving safety, while also eliminating the need for complex external power systems and relying on purely mechanical structures to achieve high reliability and rapid ladder retrieval from the top of the vehicle. This would result in better performance in terms of safety, ease of operation, cost-effectiveness, and reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a manual floor-mounted ladder rack, which can significantly reduce the operational intensity and danger of picking up and placing long ladders, thereby reducing the workload of workers and improving safety. It can also eliminate the need for a complex external power system to save costs, and rely on a purely mechanical structure to improve the reliability and efficiency of ladder picking up and placing.

[0006] The embodiments of the present invention are implemented as follows: This application provides a manual floor-standing pull ladder frame, including a fixed frame, a sliding frame, a flipping mechanism, and an energy storage mechanism; The flipping mechanism includes a linear moving part and a flipping part. The linear moving part is slidably disposed on the fixed frame. The flipping part is rotatably connected to the linear moving part, and the rotation plane of the flipping part is parallel to the sliding direction of the linear moving part. The sliding frame is disposed on the flipping part and is used to support the ladder. The energy storage mechanism includes a fixed block, a first slider, an outer sleeve, an inner column, an energy storage spring, and a connecting rod. The fixed block is fixedly mounted on the linear moving part. One end of the inner column can slidably extend into the outer sleeve. The first slider is fixedly sleeved on the inner column and forms a sliding fit with the linear moving part. Its sliding direction is parallel to the sliding direction of the linear moving part. The energy storage spring is sleeved on the inner column, with one end connected to the first slider and the other end connected to the fixed block. One end of the connecting rod is hinged to the flipping part, and the other end is hinged to a second slider. The second slider is slidably mounted on the linear moving part. Its sliding direction is consistent with the sliding direction of the first slider, and the second slider can abut against the first slider.

[0007] In some embodiments of the present invention, a first groove is formed on the linear moving part along its sliding direction, and both the first slider and the second slider are slidably disposed within the first groove. (A fixing block is disposed within the first groove.) In some embodiments of the present invention, a first ladder limiting member is provided at one end of the aforementioned fixed frame. The first ladder limiting member includes a limiting frame through which one end of the ladder can pass. (The limiting frame is height-adjustable to accommodate the thickness of the ladder.) In some embodiments of the present invention, a second ladder limiting member is provided on the sliding frame, the second ladder limiting member including a latch, and the crossbar of the ladder can be locked in the latch.

[0008] In some embodiments of the present invention, a limiting seat is provided at one end of the fixed frame away from the limiting frame, for abutting against the linear moving part to limit its travel.

[0009] In some embodiments of the present invention, a second sliding groove is provided on the sliding frame, the extension direction of the second sliding groove is parallel to the sliding direction of the linear moving part, and a base is provided on one end of the fixed frame away from the limiting frame. A roller with a diameter matching the width of the second sliding groove is provided on the base. The roller is disposed in the second sliding groove and can roll along the inner wall of the second sliding groove.

[0010] In some embodiments of the present invention, a locking member is provided on the linear moving part. The locking member includes a limiting plate, a pull rope, and a return spring. The middle part of the limiting plate is rotatably disposed on the linear moving part. One end of the limiting plate can extend into the second slide groove. One end of the limiting plate located in the second slide groove has a wedge-shaped structure. One end of the return spring is connected to one end of the limiting plate away from the second slider, and the other end is connected to the linear moving part. One end of the limiting plate located on the side of the second slide groove is connected to the pull rope, and the end of the pull rope is fixed on the linear moving part.

[0011] In some embodiments of the present invention, a linear locking member is provided on the fixed frame, the linear locking member including a limiting rod and a pull rod, the limiting rod is fixedly disposed on the fixed frame, one end of the pull rod is hinged to the sliding frame, and the one end of the pull rod hinged to the sliding frame has a slot adapted to the limiting rod, the slot can be locked onto the limiting rod.

[0012] In some embodiments of the present invention, a rotating locking member is provided at one end of the pull rod away from the slot, the rotating locking member being used to detachably connect the pull rod to the side wall of the fire truck body.

[0013] In some embodiments of the present invention, the aforementioned rotating locking member includes a base, a rotating rod, and a pressing part. The base is fixedly disposed on the side wall of the fire truck body. The middle part of the rotating rod is rotatably disposed on the pull rod. A connecting groove is provided on the base. One end of the rotating rod can extend into the connecting groove. The pressing part is slidably disposed on the pull rod, and one end of the pressing part is connected to one end of the rotating rod away from the connecting groove.

[0014] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: 1. In this invention, the ladder is normally fixed to the top of the fire truck body, while the ladder is supported by a sliding frame. The linear moving part slides on the fixed frame, causing the flipping part and the sliding frame connected to it to move, allowing the sliding frame to extend out of the truck roof. As the sliding frame and the ladder extend out of the truck roof, under their own weight, the sliding frame drives the flipping part to rotate, bringing one end of the sliding frame to the ground, thus allowing the ladder to reach the ground for easy access. During the flipping process, the connecting rod drives the second slider to slide, causing it to contact the first slider. After the first slider contacts the second slider, the force of the second slider causes the inner column to expand and contract, resulting in the elastic deformation of the energy storage spring, which acts as a buffer. The energy storage mechanism completely eliminates the risk of uncontrolled slippage that occurs during traditional manual flipping; simultaneously, it also allows the energy storage spring to deform and generate elastic potential energy.

[0015] When the ladder needs to be returned to the top of the carriage, it can be placed back onto the sliding frame. The worker simply needs to rotate the sliding frame and the tilting mechanism to return the ladder to the top of the carriage. Then, pushing the linear moving part will move the ladder back to its initial position. During the rotation of the tilting part, the deformed energy storage spring releases elastic potential energy. Under the action of this potential energy, the energy storage spring acts on the first slider, causing the second slider to move. This moves the connecting rod, pulling the tilting part to rotate, providing partial tilting power and allowing the user to easily tilt the part. This significantly reduces the operational intensity and danger of retrieving and placing long ladders, reduces the workload of workers, improves the convenience of retrieval and placement, and enhances safety.

[0016] 2. Compared to existing external power systems, this invention employs a purely mechanical structure, avoiding the reliability issues caused by malfunctions in external power systems. It also saves costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention in a rotating state; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the installation structure of the energy storage mechanism in an embodiment of the present invention; Figure 4 This is a schematic diagram of the installation structure of the sliding frame in an embodiment of the present invention; Figure 5 for Figure 4 Enlarged view of point B in the middle; Figure 6 This is a cross-sectional structural diagram of an embodiment of the present invention; Figure 7 for Figure 6 Enlarged view of point C in the middle; Figure 8 This is a schematic diagram of the installation structure of the rotating locking component in an embodiment of the present invention; Figure 9 This is a side view of an embodiment of the present invention; Figure 10 for Figure 9 Enlarged view at point E in the middle; Figure 11 This is a schematic diagram of the installation structure of the locking component in an embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of an embodiment of the present invention in a linear motion state; Figure 13 for Figure 12 Enlarged view at point F; Figure 14 for Figure 12 Enlarged view of point G in the middle; Figure 15 This is a schematic diagram of the mechanism of the second slide in an embodiment of the present invention; Figure 16 This is a schematic diagram of the ladder installation with a 90° rotation in an embodiment of the present invention.

[0019] Icons: 1-Fixed frame; 2-Sliding frame; 3-Linear moving part; 4-Flipping part; 5-Fixing block; 6-First slider; 7-Outer sleeve; 8-Inner column; 9-Energy storage spring; 10-Connecting rod; 11-Second slider; 12-First slide groove; 13-Limit frame; 14-Lock; 15-Limit seat; 16-Second slide groove; 17-Roller; 18-Limit plate; 19-Pull rope; 20-Reset spring; 21-Limit rod; 22-Pull rod; 23-Card slot; 24-Base; 25-Ladder; 26-Rotating rod; 27-Pressing part; 28-Connecting groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] Example Please refer to Figures 1-16 This embodiment provides a manual floor-standing pull ladder frame, including a fixed frame 1, a sliding frame 2, a flipping mechanism, and an energy storage mechanism. The flipping mechanism includes a linear moving part 3 and a flipping part 4, with the linear moving part 3 slidably mounted on the fixed frame 1. The flipping part 4 is rotatably connected to the linear moving part 3, and the rotation plane of the flipping part 4 is parallel to the sliding direction of the linear moving part 3. The sliding frame 2 is mounted on the flipping part 4 and is used to support the ladder 25. The energy storage mechanism includes a fixed block 5, a first slider 6, an outer sleeve 7, an inner column 8, an energy storage spring 9, and a connecting rod 10. The fixed block 5 is fixedly mounted on the linear moving part 3. One end of the inner column 8 slidably extends into the outer sleeve 7, and the first slider 6 is fixedly sleeved on the inner column 8, forming a sliding engagement with the linear moving part 3, with its sliding direction parallel to the sliding direction of the linear moving part 3. The energy storage spring 9 is sleeved on the inner column 8, with one end connected to the first slider 6 and the other end connected to the fixed block 5. One end of the connecting rod 10 is hinged to the flipping part 4, and the other end is hinged to the second slider 11. The second slider 11 is slidably disposed on the linear moving part 3, and its sliding direction is consistent with the sliding direction of the first slider 6, and the second slider 11 can abut against the first slider 6.

[0023] In this embodiment, the ladder 25 is normally mounted on the sliding frame 2, while the fixed frame 1 is fixedly installed on the top of the fire truck body, and the ladder 25 is supported by the sliding frame. By sliding the linear moving part 3 on the fixed frame 1, the flipping part 4 and the sliding frame 2 connected to it can be moved, causing the sliding frame 2 to extend out of the top of the truck body. As the sliding frame 2 and the ladder 25 extend out of the top of the truck body, under the weight of the sliding frame 2 and the ladder 25, the sliding frame 2 will drive the flipping part 4 to rotate, causing one end to rotate to the ground position, thus allowing the ladder 25 to reach the ground for easy access by the user. During the flipping process of the flipping part 4, the connecting rod 10 will drive the second slider 11 to slide, causing the second slider 11 to abut against the first slider 6. After the two abut against each other, under the force of the second slider 11, the inner column 8 expands and contracts, causing the energy storage spring 9 to undergo elastic deformation to play a buffering role. This energy storage mechanism completely eliminates the risk of loss of control and slippage that is easily caused when manually flipping the device, and can also generate elastic potential energy through the deformation of the energy storage spring 9.

[0024] When it is necessary to return ladder 25 to the top of the carriage, ladder 25 can be placed back on the sliding frame 2. At this time, the worker only needs to rotate the sliding frame 2 and the tilting part 4 to return ladder 25 on the sliding frame 2 to the top of the carriage, and then push the linear moving part 3 to move ladder 25 to the initial position. During the rotation of the tilting part 4, the deformed energy storage spring 9 releases elastic potential energy. Under the action of this elastic potential energy, the energy storage spring 9 exerts a force on the first slider 6, causing the second slider 11 to move, which in turn drives the connecting rod 10 to pull the tilting part 4 to rotate, providing some power for the tilting process and helping the user easily complete the tilting operation of the tilting part 4. In this way, the operational intensity and danger of long ladder retrieval and placement operations can be significantly reduced, the workload of workers can be reduced, the convenience of retrieval and placement can be improved, and safety can be further enhanced.

[0025] Therefore, this manual floor-mounted ladder rack can significantly reduce the operational intensity and danger of retrieving and placing long ladders, thereby reducing the workload of staff and improving safety. It can also eliminate the need for a complex external power system and rely on a purely mechanical structure to achieve high reliability and rapid retrieval and placement of the ladder 25 from the top of the carriage, thus achieving better results in terms of safety, ease of operation, cost-effectiveness and reliability.

[0026] Specifically, in this embodiment, a first groove 12 is provided on the linear moving part 3 along its sliding direction, and the first slider 6 and the second slider 11 are both slidably disposed within the first groove 12. The first groove 12 provides a stable track for the sliding of the first slider 6 and the second slider 11, ensuring that their sliding directions are consistent and that no deviation occurs. At the same time, the first slider 6 and the second slider 11 are slidably engaged with the first groove 12 to reduce the friction of the sliders during the sliding process and improve the operating efficiency of the entire mechanical structure. It should be noted that the first groove 12 in this embodiment is a limiting groove structure, which can prevent the first slider 6 and the second slider 11 from falling out of it.

[0027] Furthermore, to ensure that the sliding direction of the inner column 8 on the outer sleeve 7 is consistent with the sliding direction of the first slider 6, in this embodiment, the inner column 8 and the outer sleeve 7 are coaxially arranged within the first slide groove 12, and the inner column 8 moves along the extending direction of the first slide groove 12. The fixing block 5 is also disposed within the first slide groove 12, so that the extension and retraction direction of the spring is also consistent with the sliding direction of the first slider 6.

[0028] Preferably, in this embodiment, a first ladder limiting member is provided at one end of the fixed frame 1. The first ladder limiting member includes a limiting frame 13, and one end of the ladder 25 can pass through the limiting frame 13. The limiting frame 13 is mainly used to constrain the ladder 25, so that the ladder 25 can be relatively fixed on the sliding frame 2, and to prevent the ladder 25 from detaching from the sliding frame 2.

[0029] Specifically, the length direction of the aforementioned limiting frame 13 is adapted to the width direction of the ladder 25 to constrain the ladder 25 in the width direction. Simultaneously, the thickness direction of the limiting frame 13 is adapted to the thickness direction of the ladder 25 to constrain the ladder 25 in the thickness direction. In this way, the ladder 25 can be effectively fixed and constrained. In some embodiments of this example, the length and / or width of the limiting frame 13 are adjustable to accommodate different ladder 25 sizes.

[0030] Furthermore, in this embodiment, a second ladder limiting member is provided on the sliding frame 2. The second ladder limiting member includes a latch 14, and the crossbar of the ladder 25 can be locked in the latch 14. After the crossbar of the ladder 25 is locked, the ladder 25 can be constrained in the length direction of the ladder 25, so that the ladder 25 is completely constrained on the sliding frame 2.

[0031] Preferably, in this embodiment, a limiting seat 15 is provided at one end of the fixed frame 1 away from the limiting frame 13, which is used to abut against the linear moving part 3 to limit its travel. The limiting seat 15 can effectively ensure that the linear moving part 3 operates within a reasonable travel range, avoiding equipment damage, safety hazards, or detachment due to excessive movement.

[0032] Preferably, in this embodiment, the sliding frame 2 is provided with a second sliding groove 16. The extending direction of the second sliding groove 16 is parallel to the sliding direction of the linear moving part 3. A base is provided at one end of the fixed frame 1 away from the limiting frame 13. A roller 17 with a diameter matching the width of the second sliding groove 16 is provided on the base. The roller 17 is disposed in the second sliding groove 16 and can roll along the inner wall of the second sliding groove 16. Through the cooperation of the roller 17 and the second sliding groove 16, the sliding frame 2 can slide smoothly and steadily along the sliding direction of the linear moving part 3. When the roller 17 rolls in the second sliding groove 16, the friction during the sliding process is greatly reduced, improving the flexibility and efficiency of the sliding. At the same time, since the diameter of the roller 17 matches the width of the second sliding groove 16, it can effectively prevent the roller 17 from shaking or deviating during the sliding process, ensuring the stability and accuracy of the movement of the sliding frame 2. Specifically, the diameter of the aforementioned roller is adapted to the width of the second slide groove 16, enabling the roller 17 to provide a restraining effect and preventing overturning when the sliding frame 2 and the flipping part 4 move with the linear moving part 3. After the linear moving part 3 abuts against the aforementioned limiting seat 15, the linear moving part 3 stops moving. At this point, the roller 17 has just moved to the outside of the end of the second slide groove 16, ensuring that the sliding frame 2 and the flipping part 4 are not subject to rotational constraints, thus guaranteeing that the sliding frame 2 and the flipping part 4 can normally perform the next flipping action.

[0033] It should be noted that, in order to reduce the number of parts, the base in this embodiment directly serves as the aforementioned limiting seat 15, which not only limits the linear moving part 3 but also facilitates the installation of the roller 17.

[0034] Preferably, in this embodiment, the linear moving part 3 is provided with a locking member, which includes a limiting plate 18, a pull rope 19, and a return spring 20. The middle part of the limiting plate 18 is rotatably mounted on the linear moving part 3, and one end of the limiting plate 18 can extend into the second slide groove 16. One end of the limiting plate 18 located in the second slide groove 16 has a wedge-shaped structure. One end of the return spring 20 is connected to one end of the limiting plate 18 away from the second slider 11, and the other end is connected to the linear moving part 3. One end of the limiting plate 18 located on the side of the second slide groove 16 is connected to the pull rope 19, and the end of the pull rope 19 is fixed to the linear moving part 3.

[0035] In this embodiment, the locking member is mainly used to lock the second slider 11, thereby preventing the flipping part 4 from flipping in the opposite direction due to external force after the flipping part 4 has flipped. When the flipping part 4 flips, the second slider 11 moves with the connecting rod 10 and slides towards the first slider 6 in the first slide groove 12. The second slider 11 moves to the limiting plate 18 and pushes the limiting plate 18 to rotate, causing the limiting plate 18 to disengage from the first slide groove 12. After the second slider 11 passes the limiting plate 18, the limiting plate 18 re-enters the first slide groove 12 under the action of the return spring 20. At this time, the second slider 11 is limited between the first slider 6 and the limiting plate 18. When it is necessary to release the limitation of the second slider 11, the pull rope 19 can be pulled to rotate the limiting plate 18 and move it out of the first slide groove 12. At this time, the second slider 11 can slide normally.

[0036] Preferably, in this embodiment, the fixed frame 1 is provided with a linear locking component. The linear locking component includes a limiting rod 21 and a pull rod 22. The limiting rod 21 is fixedly mounted on the fixed frame 1. One end of the pull rod 22 is hinged to the sliding frame 2, and the end of the pull rod 22 hinged to the sliding frame 2 has a slot 23 adapted to the limiting rod 21, which can be engaged with the limiting rod 21.

[0037] When the ladder 25 is normally installed on the top of the carriage, a linear locking device is provided to prevent the sliding frame 2 from sliding with the linear moving part 3. Specifically, the slot 23 on the pull rod 22 engages with the limiting rod 21, effectively limiting the sliding frame 2 in the sliding direction of the linear moving part 3. When the ladder 25 needs to be retrieved, the pull rod 22 is rotated to separate the limiting rod 21 from the slot 23, allowing the sliding frame 2 to slide linearly normally.

[0038] Furthermore, in this embodiment, a rotating locking element is provided at one end of the pull rod 22 away from the slot 23. The rotating locking element is used to detachably connect the pull rod 22 to the side wall of the fire truck body. The aforementioned rotating locking element is mainly used to constrain the pull rod 22, preventing it from rotating and thus preventing the slot 23 from separating from the limiting rod 21.

[0039] Specifically, in this embodiment, the aforementioned rotating locking component includes a base 24, a rotating rod 26, and a pressing part 27. The base 24 is fixedly mounted on the side wall of the fire truck body, the middle part of the rotating rod 26 is rotatably mounted on the pull rod 22, the base 24 has a connecting groove 28, one end of the rotating rod 26 can extend into the connecting groove 28, and the pressing part 27 is slidably mounted on the pull rod 22, with one end of the pressing part 27 connected to one end of the rotating rod 26 away from the connecting groove 28.

[0040] Under normal conditions, one end of the rotating rod 26 extends into the connecting groove 28, at which point the rotating locking element is locked, the pull rod 22 is constrained and cannot rotate, and the slot 23 is securely engaged with the limiting rod 21, ensuring that the sliding frame 2 is effectively limited. When the ladder 25 needs to be retrieved, the operator can apply pressure to the pressing part 27. Since the pressing part 27 is connected to one end of the rotating rod 26, the sliding of the pressing part 27 will drive the rotating rod 26 to rotate around its middle portion on the pull rod 22. As the rotating rod 26 rotates, the end of it extending into the connecting groove 28 will gradually disengage from the connecting groove 28. At this time, the rotating locking element is released, and the pull rod 22 can rotate freely. The operator rotates the pull rod 22 to separate the limiting rod 21 from the slot 23, and the sliding frame 2 can then slide normally in a straight line on the linear moving part 3, thereby enabling the ladder 25 to be retrieved. This rotating locking mechanism cleverly utilizes the principles of rotation and sliding, making it easy to operate and highly reliable. It can effectively limit the sliding frame 2 when the ladder 25 is in normal position, and can quickly release the limit when needed, making it easy to access the ladder 25.

[0041] Preferably, in this embodiment, the aforementioned fixed frame 1 is provided with a plurality of fixed seats at even intervals, and the plurality of fixed seats can be fixed to the top of the carriage, thereby realizing a fixed connection between the fixed frame and the carriage.

[0042] In use, the user quickly unlocks the device by rotating the locking mechanism. Specifically, applying force to the pressing part 27 drives the rotating rod 26 to rotate around its pivot point on the pull rod 22, causing one end of the rotating rod 26 to gradually disengage from the connecting groove 28, thus releasing the lock. Afterward, the operator can freely rotate the pull rod 22, disengaging the slot 23 from the limiting rod 21, and the sliding frame 2 resumes its sliding function along the linear movement part 3, facilitating the retrieval and placement of the ladder 25. Subsequently, the operator can pull the pull rod 22, causing the sliding frame 2, the flipping part 4, and the linear movement part 3 to move linearly, extending the sliding frame 2 out of the top of the carriage. As the sliding frame 2 and the ladder 25 extend out of the top of the carriage, under the weight of the sliding frame 2 and the ladder 25, and with the pulling force of the pull rod 22, the sliding frame 2 will rotate the flipping part 4, causing one end to rotate to the ground position, allowing the ladder 25 to reach the ground for easy access by the user. During the above process, the ladder 25 will slide out of the limiting frame 13 while making linear motion. After the flip is completed, the locking buckle 14 can be released from the crossbar of the ladder 25 to remove the ladder 25. During the flipping process of the flipping part 4, the connecting rod 10 will drive the second slider 11 to slide, so that the second slider 11 abuts against the first slider 6. After the two abut against each other, under the force of the second slider 11, the inner column 8 expands and contracts, causing the energy storage spring 9 to undergo elastic deformation to play a buffering role. This energy storage mechanism completely eliminates the risk of loss of control and slippage that is easy to occur when flipping manually in the traditional way, and can also generate elastic potential energy through the deformation of the energy storage spring 9.

[0043] When it is necessary to return the ladder 25 to the top of the carriage, the ladder 25 can be placed back on the sliding frame 2, and the crossbar of the ladder 25 can be re-locked using the latch 14. At this time, the operator only needs to use the pull rod 22 to rotate the sliding frame 2 and the flipping part 4, so that the ladder 25 on the sliding frame 2 returns to the top of the carriage. Then, the pull rod 22 is used to push the linear moving part 3 to move the ladder 25 back to the initial position. During the process of the ladder 25 moving linearly back to the initial position with the sliding frame 2, the ladder 25 passes through the limiting frame 13 again to complete the limiting. During the rotation of the flipping part 4, the deformed energy storage spring 9 will release elastic potential energy. Under the action of this elastic potential energy, the energy storage spring 9 will exert a force on the first slider 6, causing the second slider 11 to move, which in turn drives the connecting rod 10 to pull the flipping part 4 to rotate, providing some power for the flipping process and helping the user to easily complete the flipping operation of the flipping part 4. After the ladder 25 returns to its initial position, first rotate the pull rod 22 to make the limit rod 21 re-lock into the slot 23. Finally, use the rotating locking mechanism to lock the pull rod 22 back in place.

[0044] It should be noted that the fixed frame 1, sliding frame 2, and tilting mechanism in this embodiment are all made of aluminum profiles. Aluminum profiles have advantages such as light weight, high strength, and corrosion resistance, which greatly reduces the weight of the entire ladder frame, making it easier for workers to operate and move. At the same time, its high strength ensures that it can withstand the weight of the ladder 25 and the operator during use, ensuring the stability and safety of the ladder frame. Moreover, its corrosion resistance can effectively extend the service life of the ladder frame and reduce damage and maintenance costs caused by rust and other problems. In long-term outdoor use, aluminum profiles can resist the erosion of various harsh weather conditions and maintain good performance. In addition, aluminum profiles have good processing performance and can be precisely cut, assembled, and connected according to actual needs, so that the various components of the ladder frame can fit together tightly, improving the overall assembly accuracy and reliability.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A manually operated floor-standing pull ladder frame, characterized in that, It includes a fixed frame, a sliding frame, a tilting mechanism, and an energy storage mechanism; The flipping mechanism includes a linear moving part and a flipping part. The linear moving part is slidably disposed on the fixed frame. The flipping part is rotatably connected to the linear moving part, and the rotation plane of the flipping part is parallel to the sliding direction of the linear moving part. The sliding frame is disposed on the flipping part and is used to support the ladder. The energy storage mechanism includes a fixed block, a first slider, an outer sleeve, an inner column, an energy storage spring, and a connecting rod. The fixed block is fixedly mounted on the linear moving part. One end of the inner column can slidably extend into the outer sleeve. The first slider is fixedly sleeved on the inner column and forms a sliding fit with the linear moving part. Its sliding direction is parallel to the sliding direction of the linear moving part. The energy storage spring is sleeved on the inner column, with one end connected to the first slider and the other end connected to the fixed block. One end of the connecting rod is hinged to the flipping part, and the other end is hinged to a second slider. The second slider is slidably mounted on the linear moving part. Its sliding direction is consistent with the sliding direction of the first slider, and the second slider can abut against the first slider.

2. The manual floor-standing pull ladder frame according to claim 1, characterized in that, The linear moving part is provided with a first sliding groove along its sliding direction, and the first slider and the second slider are both slidably disposed in the first sliding groove.

3. The manual floor-standing pull ladder frame according to claim 1, characterized in that, One end of the fixed frame is provided with a first ladder limiting component, which includes a limiting frame through which one end of the ladder can pass.

4. The manual floor-standing pull ladder frame according to claim 3, characterized in that, The sliding frame is provided with a second ladder limiting component, which includes a latch, and the crossbar of the ladder can be locked in the latch.

5. The manual floor-standing pull ladder frame according to claim 3, characterized in that, A limiting seat is provided at one end of the fixed frame away from the limiting frame, which is used to abut against the linear moving part to limit its travel.

6. The manual floor-standing pull ladder frame according to claim 3, characterized in that, The sliding frame is provided with a second sliding groove, the extension direction of the second sliding groove is parallel to the sliding direction of the linear moving part, and a base is provided on one end of the fixed frame away from the limiting frame. The base is provided with a roller with a diameter matching the width of the second sliding groove. The roller is disposed in the second sliding groove and can roll along the inner wall of the second sliding groove.

7. The manual floor-standing pull ladder frame according to claim 2, characterized in that, The linear moving part is provided with a locking component, which includes a limiting plate, a pull rope, and a return spring. The middle part of the limiting plate is rotatably mounted on the linear moving part. One end of the limiting plate can extend into the first slide groove. The end of the limiting plate located in the first slide groove has a wedge-shaped structure. One end of the return spring is connected to one end of the limiting plate away from the second slider, and the other end is connected to the linear moving part. One end of the limiting plate located on the side of the first slide groove is connected to the pull rope, and the end of the pull rope is fixed on the linear moving part.

8. The manual floor-standing pull ladder frame according to claim 1, characterized in that, The fixed frame is provided with a linear locking component, which includes a limiting rod and a pull rod. The limiting rod is fixedly installed on the fixed frame, and one end of the pull rod is hinged to the sliding frame. The end of the pull rod hinged to the sliding frame has a slot that matches the limiting rod, and the slot can be engaged with the limiting rod.

9. The manual floor-standing pull ladder frame according to claim 8, characterized in that, A rotating locking element is provided at one end of the pull rod away from the slot, which is used to detachably connect the pull rod to the side wall of the fire truck body.

10. The manually operated floor-standing pull-out ladder frame according to claim 9, characterized in that, The rotating locking component includes a base, a rotating rod, and a pressing part. The base is fixedly installed on the side wall of the fire truck body. The middle part of the rotating rod is rotatably mounted on the pull rod. A connecting groove is provided on the base. One end of the rotating rod can extend into the connecting groove. The pressing part is slidably mounted on the pull rod, and one end of the pressing part is connected to one end of the rotating rod away from the connecting groove.

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