An extendable, bend-adjustable rescue ladder

Abstract

The application relates to the technical field of fire-fighting equipment, in particular to a rescue ladder capable of being extended and bent, which comprises a vertical ladder supported on the ground and an extension ladder arranged on the outer side of the vertical ladder. Positioning blocks are arranged on the lower sides of the two ends of the extension ladder. Guide wheels are arranged on the outer sides of the upper end and the middle position of the vertical ladder. Two groups of folding wheels are arranged on the lower side of the vertical ladder. The positioning blocks on the two ends of the extension ladder are fixedly connected with one end of first steel ropes and second steel ropes respectively. The first steel ropes and the second steel ropes are connected with the two groups of folding wheels through the two groups of guide wheels arranged on the upper and middle positions of the vertical ladder. The extension ladder capable of being bent relative to the vertical ladder is arranged to increase the diversity of rescue, so that the device can be erected to a farther position by crossing the obstacles of adjacent buildings or low houses. The device can be erected at a position far from a rescue point and unreachable by a conventional rescue ladder, so that the rescue efficiency is improved and the rescue success rate is increased.

Description

Technical Field

[0001] This invention relates to the field of fire-fighting equipment technology, specifically to an extendable, bendable, and adjustable rescue ladder. Background Technology

[0002] Firefighting refers to eliminating hidden dangers and preventing disasters. It mainly includes personnel rescue at fire scenes, the salvage of important facilities, equipment, and cultural relics, the security and rescue of important property, and extinguishing fires. The aim is to reduce the extent of damage caused by fires and minimize casualties and property losses.

[0003] Rescue ladders are a common type of climbing tool used in firefighting. They are usually divided into three types: single-bar ladders, hook ladders, and extension ladders. Regardless of the type of rescue ladder, its function is limited to extending towards the ladder itself to climb higher, and it does not have any other functions.

[0004] In actual use, existing rescue ladders can only be set up and used under buildings in the area where rescue is needed, which has obvious limitations. When the space under the building is narrow, such as the narrow alleyway in an old residential area, the rescue ladder cannot be properly erected at an angle and people can get on it, so other equipment is needed for rescue operations.

[0005] Furthermore, there are still many densely built residential buildings in society. In addition to the building entrance, the windows of such buildings may be located on the side of the adjacent low-rise buildings. The distance between the buildings is narrow and the construction is relatively dense. Therefore, when a fire occurs and it is not possible to enter the building directly through the door for rescue, the only way to rescue is through the window. If there is no space between the buildings to allow the ladder to enter, and it is not possible to set up a rescue ladder directly from the ground to cross the adjacent low-rise buildings and reach the window, the difficulty of the rescue will be greatly increased.

[0006] Furthermore, during the fire, when setting up rescue ladders for rescue operations, if the flames have already spread, firefighters often need to climb through multiple burning areas to reach the rescue point. This process is not only highly dangerous, but the thick smoke from the fire also rises along the exterior walls, affecting the rescuers' visibility and significantly limiting the rescue efforts. Summary of the Invention

[0007] The purpose of this invention is to provide an extendable and bendable rescue ladder to solve the problem mentioned in the background art that the existing rescue ladders can only extend and ascend along the direction of the ladder itself, which has certain limitations and cannot provide good assistance for crossing obstacles and rescuing people from multi-story fires.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an extendable and bendable rescue ladder, comprising a vertical ladder supported on the ground and an extension ladder disposed on the outside of the vertical ladder, wherein positioning blocks are provided on the lower sides of both ends of the extension ladder, guide wheels are provided on the upper end and the outer side of the middle position of the vertical ladder, and two sets of retractable wheels are provided on the lower side of the vertical ladder.

[0009] The positioning blocks at both ends of the extension ladder are fixedly connected to one end of the first steel rope and the second steel rope, respectively. The first steel rope and the second steel rope pass around the two sets of guide wheels on the upper middle of the vertical ladder and are connected to the two sets of take-up and release wheels.

[0010] The extension ladder slides on the vertical ladder via a sliding assembly and can rotate. Both sides of the upper end of the vertical ladder are provided with limiting mechanisms to restrict the sliding of the extension ladder, and a buffer mechanism is provided on the upper side of the extension ladder.

[0011] A transmission chamber is provided on the lower side of the ladder. Both sets of take-up and release wheels are rotatably mounted on the outside of the transmission chamber. The transmission chamber is provided with a drive assembly for rotating the take-up and release wheels to take up and release the first steel rope and the second steel rope, as well as a locking mechanism for limiting the drive assembly.

[0012] Preferably, a support base is provided on the inner side of the upper end of the ladder, and the support base protrudes from the guide wheel.

[0013] Preferably, the positioning block is rotatably mounted on the extension ladder, the guide wheel is rotatably mounted on the outer wall of the vertical ladder, the outer side of the guide wheel is provided with an arc-shaped baffle for preventing the first steel rope and the second steel rope from coming off, and the arc-shaped baffle is fixedly connected to the vertical ladder, and the lower side of the take-up and release wheel is provided with an arc-shaped baffle for preventing the first steel rope or the second steel rope from coming off, and the arc-shaped baffle is fixedly connected to the transmission chamber.

[0014] Preferably, the first steel rope passes through the guide wheel on the upper side of the ladder near the ladder and is wound and fixed from the outside of the take-up and release wheel on the side away from the ladder. The second steel rope passes through the guide wheel at the middle position of the ladder on the side away from the ladder and is wound and fixed from the outside of the take-up and release wheel on the side near the ladder. The first steel rope and the second steel rope are wound in opposite directions and away from each other from the two sets of take-up and release wheels.

[0015] Preferably, the sliding assembly includes two sets of guide grooves parallel to each other on the inner side of the extension ladder and rollers slidably installed in the guide grooves. The rollers are movably sleeved on the positioning shaft, and the positioning shaft is laterally inserted into the upper end of the vertical ladder.

[0016] Preferably, the limiting mechanism includes positioning holes equidistantly opened on the outer wall of the extension ladder, and the inner diameter of the positioning holes is adapted to the outer end diameter of the positioning shaft, and the outer end face edge of the positioning shaft is set as a rounded corner;

[0017] The inner end of the positioning shaft is longitudinally inserted with a pin, and a return spring is sleeved on the lower side of the pin. The upper and lower ends of the return spring abut against the lower side of the positioning shaft and the lower end of the pin, respectively. The upper crossbeam of the ladder has two sets of slots with inner diameters that match the outer diameter of the lower end of the pin, and the distance between the two sets of slots is greater than or equal to the depth of the positioning hole.

[0018] Preferably, the buffer mechanism includes a buffer plate rotatably mounted on the upper inner wall of the extension ladder, wherein the outer concave wall of the buffer plate and the inner wall of the guide groove are both glued with rubber pads for buffering.

[0019] A connecting rod is rotatably mounted on the end of the buffer plate away from the rotation point. A movable groove with a connecting guide is opened inside the upper end of the extension ladder. A piston connected to the end of the connecting rod away from the buffer plate is provided in the movable groove. A buffer spring with both ends abutting against the piston and the inner wall of the movable groove is provided in the movable groove.

[0020] Preferably, the drive assembly includes two sets of first transmission rods and second transmission rods mounted in the transmission chamber via bearings. The two sets of second transmission rods are mounted in the two transmission chambers via bearings. The two sets of first transmission rods are respectively connected to two sets of take-up and release wheels. A first gear is mounted on the first transmission rod, and a second gear that meshes with the first gear is mounted on the second transmission rod. A crank handle is provided at the outer end of the second transmission rod.

[0021] Preferably, the locking mechanism includes a rotating shaft rotatably mounted between the two sets of transmission chambers. Each end of the rotating shaft has a crank handle and a bidirectional thread. Two sets of movable seats are symmetrically arranged along the bidirectional thread of the rotating shaft. The two sets of movable seats are respectively positioned on both sides of the second gear. A clamping plate is provided on the opposite side of each set of movable seats. Guide rods are equidistantly arranged at the end of each clamping plate near the movable seat. The guide rods are movably inserted into the movable seats, and the outer diameter of the end of the guide rod is larger than the diameter of the hole on the movable seat. A compression spring is provided on the guide rod, and both ends of the compression spring abut against the movable seat and the clamping plate, respectively. Friction plates for rubbing and locking the second gear are provided on the opposite surface of each set of clamping plates.

[0022] The beneficial effects of this invention are as follows: This invention increases the versatility of rescue by setting up an extension ladder that can be bent and extended relative to the upright ladder, so that the device can cross obstacles or low buildings near the building to reach a more distant location. This allows it to be set up in locations far from the rescue point and inaccessible to conventional rescue ladders, thereby improving rescue efficiency and increasing the success rate of rescue. In addition, when fighting fires in high-rise buildings, this device can also use the extension ladder to allow the upright ladder to be set up at a certain distance away from the building, so that rescuers can reduce their contact with dense smoke and flames at the bottom when entering the rescue point, thereby reducing the danger and improving rescue efficiency.

[0023] Furthermore, this device is not only suitable for different rescue ladders, but also for extension ladders, etc. By shaking the retraction wheel on the lower side after unfolding, the synchronous retraction and release of the first and second steel ropes can be controlled, thereby achieving the adjustment of the inclination and distance of the extension ladder. It can be greatly adapted to different rescue environments and adjustments, which is beneficial for rescue in narrow areas and between adjacent buildings of different heights. Moreover, when there is no support for the extension ladder, if the upright ladder is successfully erected, the first and second steel ropes can be used to support the extension ladder, ensuring that the extension ladder can be placed on the upright ladder at an inclination and has a certain length of support, thus enabling suspended rescue and increasing the diversity of rescue methods. Attached image description:

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front view schematic diagram of the structure of the present invention;

[0026] Figure 2 This is a rear view schematic diagram of the structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the folded state of the present invention;

[0028] Figure 4 This is a side view of the structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the sliding component in this invention;

[0030] Figure 6 This is a schematic diagram of the structure of the limiting mechanism in this invention;

[0031] Figure 7 This is a schematic diagram of the structure of the buffer mechanism in this invention;

[0032] Figure 8 This is a schematic diagram of the structure of the take-up and take-down wheels in this invention;

[0033] Figure 9 This is a schematic cross-sectional view of the transmission compartment in this invention;

[0034] Figure 10 This is a schematic diagram of the transmission mechanism in this invention;

[0035] Figure 11 This is a schematic diagram of the structure of the movable seat in this invention.

[0036] In the diagram: 1. Vertical ladder; 2. Extension ladder; 3. Positioning block; 4. Guide wheel; 5. First steel rope; 6. Second steel rope; 7. Retracting wheel; 8. Support seat; 9. Guide groove; 10. Roller; 11. Positioning shaft; 12. Positioning hole; 13. Pin; 14. Return spring; 15. Slot; 16. Buffer plate; 17. Rubber pad; 18. Connecting rod; 19. Movable groove; 20. Piston; 21. Buffer spring; 22. Transmission chamber; 23. First transmission rod; 24. First gear; 25. Second transmission rod; 26. Second gear; 27. Rotating shaft; 28. Crank handle; 29. ​​Movable seat; 30. Clamping plate; 31. Guide rod; 32. Compression spring; 33. Friction plate. Detailed implementation method:

[0037] 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 scope of protection of the present invention.

[0038] Please see Figure 1-11 An embodiment of the present invention provides: an extendable and bendable rescue ladder, including a vertical ladder 1 supported on the ground and an extension ladder 2 provided on the outside of the vertical ladder 1. Positioning blocks 3 are provided on the lower sides of both ends of the extension ladder 2. Guide wheels 4 are provided on the outer sides of the upper end and the middle position of the vertical ladder 1. Two sets of retractable wheels 7 are provided on the lower side of the vertical ladder 1.

[0039] The positioning blocks 3 at both ends of the extension ladder 2 are fixedly connected to one end of the first steel rope 5 and the second steel rope 6 respectively. The first steel rope 5 and the second steel rope 6 pass around the two sets of guide wheels 4 on the upper and middle of the vertical ladder 1 and are connected to the two sets of take-up and release wheels 7 respectively.

[0040] The extension ladder 2 slides on the vertical ladder 1 via a sliding component and can rotate. Both sides of the upper end of the vertical ladder 1 are provided with limiting mechanisms to restrict the sliding of the extension ladder 2, and a buffer mechanism is provided on the upper side of the extension ladder 2.

[0041] A transmission chamber 22 is provided on the lower side of the ladder 1. Two sets of take-up and release wheels 7 are rotatably installed on the outside of the transmission chamber 22. The transmission chamber 22 is provided with a drive assembly for rotating the take-up and release wheels 7 to take up and release the first steel rope 5 and the second steel rope 6, as well as a locking mechanism for limiting the drive assembly.

[0042] This device, through its tiltable, extendable, and adjustable extension ladder 2, allows for rescue operations across obstacles and in directions opposite to the upright ladder 1. This solves the problem mentioned in the background art that existing rescue ladders can only extend and ascend along their own direction, which has certain limitations and cannot provide good assistance for rescues across obstacles or in multi-story fires. Furthermore, when the extension ladder 2 lacks support, if the upright ladder 1 is successfully erected, it can enable a certain degree of suspended rescue, increasing the number of rescue methods and improving the possibility of rescue.

[0043] Furthermore, a support base 8 is provided on the inner side of the upper end of the ladder 1, and the support base 8 protrudes from the guide wheel 4;

[0044] like Figure 2 and Figure 4 As shown, the structure is used to provide a good tilting support for the ladder 1 through the support base 8, and can shield the guide wheel 4 on the upper side of the ladder 1 to avoid accidental damage when leaning.

[0045] Furthermore, the positioning block 3 is rotatably mounted on the extension ladder 2, the guide wheel 4 is rotatably mounted on the outer wall of the vertical ladder 1, and the outer side of the guide wheel 4 is provided with an arc-shaped baffle for blocking the first steel rope 5 and the second steel rope 6 from coming off, and the arc-shaped baffle is fixedly connected to the vertical ladder 1. The lower side of the take-up and release wheel 7 is provided with an arc-shaped baffle for blocking the first steel rope 5 or the second steel rope 6 from coming off, and the arc-shaped baffle is fixedly connected to the transmission chamber 22.

[0046] like Figure 5 , Figure 6 and Figure 8 As shown, this structure is used to prevent the first steel rope 5 or the second steel rope 6 from derailing, and at the same time, it can prevent external objects from getting tangled in.

[0047] Furthermore, the first steel rope 5 passes through the guide wheel 4 on the upper side of the ladder 1 near the side of the ladder 1, and is wound and fixed from the outside of the take-up and release wheel 7 on the side away from the ladder 1. The second steel rope 6 passes through the guide wheel 4 in the middle position of the ladder 1 on the side away from the ladder 1, and is wound and fixed from the outside of the take-up and release wheel 7 on the side close to the ladder 1. The first steel rope 5 and the second steel rope 6 are opposite to and far away from the two sets of take-up and release wheels 7.

[0048] like Figure 4As shown, the structure is used to support both ends of the extension ladder 2 through the first steel rope 5 and the second steel rope 6, so that no matter which side of the extension ladder 2 is subjected to gravity, it can be supported by the steel rope on the other side, thereby enabling the extension ladder 2 to be suspended under certain conditions.

[0049] Furthermore, the sliding assembly includes two sets of guide grooves 9 parallel to each other on the inner side of the extension ladder 2 and rollers 10 slidably installed in the guide grooves 9. The rollers 10 are movably sleeved on the positioning shaft 11, and the positioning shaft 11 is laterally movably inserted into the upper end of the vertical ladder 1.

[0050] like Figure 5 As shown, this structure allows the extension ladder 2 to slide and fold with the upright ladder 1 or slide and rise on the upright ladder 1, and can tilt and rotate to a certain extent, thereby achieving a bending and extending effect.

[0051] Furthermore, the limiting mechanism includes positioning holes 12 equidistantly opened on the outer wall of the extension ladder 2, and the inner diameter of the positioning holes 12 is adapted to the outer end diameter of the positioning shaft 11, and the outer end face edge of the positioning shaft 11 is set as a rounded corner.

[0052] The inner end of the positioning shaft 11 is longitudinally inserted with a pin 13, and a return spring 14 is sleeved on the lower side of the pin 13. The upper and lower ends of the return spring 14 abut against the lower side of the positioning shaft 11 and the lower end of the pin 13, respectively. The upper crossbeam of the ladder 1 has two sets of slots 15 with inner diameters that match the outer diameter of the lower end of the pin 13, and the distance between the two sets of slots 15 is greater than or equal to the depth of the positioning hole 12.

[0053] like Figure 5 and Figure 6 As shown, this structure is used to limit the sliding of the extension ladder 2. The sliding of the extension ladder 2 can be locked, thereby locking the extension distance and position of the extension ladder 2 to provide stability.

[0054] Furthermore, the buffer mechanism includes a buffer plate 16 rotatably mounted on the inner wall of the upper side of the extension ladder 2, and the outer concave wall of the buffer plate 16 and the inner wall of the guide groove 9 are both glued with rubber pads 17 for buffering.

[0055] A connecting rod 18 is rotatably installed at the end of the buffer plate 16 away from the rotation point. The upper end of the extension ladder 2 has a movable groove 19 that connects to the guide groove 9. A piston 20 connected to the end of the connecting rod 18 away from the buffer plate 16 is provided in the movable groove 19. A buffer spring 21 with both ends abutting against the piston 20 and the inner wall of the movable groove 19 is provided in the movable groove 19.

[0056] like Figure 5 and Figure 7As shown, this structure is used so that when the extension ladder 2 is folded up, the extension ladder 2 will slide downwards and the roller 10 will hit the buffer plate 16, thereby triggering the buffer mechanism to absorb and mitigate the impact force of its fall, thereby reducing the impact and collision between parts and improving the service life of the device.

[0057] Furthermore, the drive assembly includes two sets of first transmission rods 23 and second transmission rods 25 mounted in the transmission chamber 22 via bearings. The two sets of second transmission rods 25 are mounted in the two transmission chambers 22 via bearings. The two sets of first transmission rods 23 are respectively connected to the two sets of take-up and release wheels 7. A first gear 24 is mounted on the first transmission rod 23, and a second gear 26 that meshes with the first gear 24 is mounted on the second transmission rod 25. A crank handle 28 is provided at the outer end of the second transmission rod 25.

[0058] like Figures 8 to 10 This structure is used to control the release or retraction of the first steel rope 5 or the second steel rope 6 by rocking the handle 28, thereby changing the inclination and extension length of the extension ladder 2.

[0059] Furthermore, the locking mechanism includes a rotating shaft 27 rotatably installed between two sets of transmission chambers 22. Both ends of the rotating shaft 27 are provided with crank handles 28. Both ends of the rotating shaft 27 are provided with bidirectional threads. Two sets of movable seats 29 are symmetrically arranged at the bidirectional threads of the rotating shaft 27. The two sets of movable seats 29 are respectively placed on both sides of the second gear 26. A clamping plate 30 is provided on the opposite side of the two sets of movable seats 29. A guide rod 31 is equidistantly arranged at the end of the clamping plate 30 near the movable seat 29. The guide rod 31 is movably inserted into the movable seat 29, and the outer diameter of the end of the guide rod 31 is larger than the hole diameter on the movable seat 29. A compression spring 32 is provided on the guide rod 31, and the two ends of the compression spring 32 abut against the movable seat 29 and the clamping plate 30 respectively. Friction plates 33 for friction locking the second gear 26 are provided on the opposite side surface of the two sets of clamping plates 30.

[0060] like Figures 9 to 11 This structure is used to lock the two sets of second gears 26 on a single set of second transmission rods 25, thereby locking the first steel rope 5 or the second steel rope 6 so that it cannot retract or extend naturally when the extension ladder 2 is under force. It locks the extension ladder 2 at the tilt angle to ensure the stability and effectiveness of the device.

[0061] Working principle: When in use, first brace the upright ladder 1 to the ground and maintain its stability. Then, keep all the crank handles 28 in the active state, that is, the locking mechanism is in the open state. Next, the extension ladder 2 can be slid upward through the cooperation of the guide groove 9 and the roller 10. After the extension ladder 2 slides to the upper side of the upright ladder 1, have a rescuer climb to the upper side of the upright ladder 1 and hold the lower end of the extension ladder 2, so that it can be tilted and rotated. At this time, the person on the lower side can assist by turning the crank handle 28 to control the winding and unwinding of the first steel rope 5 and the second steel rope 6 to help set the tilt of the extension ladder 2. When the second steel rope 6 is wound by the winding wheel 7 and the first steel rope 5 is released, the tail end of the extension ladder 2 will drop, that is, the upper end will tilt up. Conversely, when the first steel rope 5 is wound and the second steel rope 6 is released, the tail end of the extension ladder 2 will rise, that is, the upper end of the extension ladder 2 will drop. Through the practice of this, the tilt angle of the extension ladder 2 can be quickly adjusted.

[0062] Additionally, the extension ladder 2 can slide laterally along the roller 10 via the guide groove 9 to control the extension distance of the extension ladder 2. Similarly, it can also be controlled by retracting the first steel rope 5 and the second steel rope 6. When the first steel rope 5 is retracted and the second steel rope 6 is released, the extension ladder 2 can move in the direction of... Figure 4 The left side extends and moves, while the right side moves. After the extension distance of the extension ladder 2 is adjusted, it is moved slightly so that the positioning hole 12 near the positioning shaft 11 is aligned. Then the pin 13 can be lifted and the positioning shaft 11 can be inserted into the positioning hole 12 so that the roller 10 cannot continue to move in the guide groove 9. At this time, the extension position of the extension ladder 2 is locked.

[0063] When the pin 13 is lifted, its lower end moves upward and compresses the return spring 14. When the pin 13 is released, the return spring 14 pushes the lower end of the pin 13 downward through the spring force. When the pin 13 is inserted into the slot 15, the pin 13 cannot move upward and leave the slot 15 naturally. Therefore, the positioning shaft 11 is locked. In this way, the pin 13 is moved to the slot 15 away from the roller 10. The positioning shaft 11 is then disengaged from the positioning hole 12. Therefore, the roller 10 can move in the guide groove 9. Conversely, when the pin 13 is placed in the slot 15 close to the roller 10, the positioning shaft 11 is inserted into the positioning hole 12. At this time, the guide groove 9 and the roller 10 cannot be displaced, that is, the extension distance of the extension ladder 2 is locked.

[0064] When controlling the winding and unwinding of the first steel rope 5 and the second steel rope 6, the second transmission rod 25 needs to be rotated by the crank handle 28. The second transmission rod 25 can be electrically driven by an external motor and a corresponding controller. When the second transmission rod 25 rotates, it will drive the first gear 24 to rotate through the second gear 26. The first gear 24 will drive the winding and unwinding wheel 7 to rotate through the first transmission rod 23. When the winding and unwinding wheel 7 rotates, it will drive the winding and unwinding of the first steel rope 5 and the second steel rope 6. Each set of second transmission rods 25 is equipped with winding and unwinding wheels 7 at both ends. It can be operated by two people in a group to achieve a faster and more stable effect. When driving the winding and unwinding of the first steel rope 5 and the second steel rope 6, it is necessary to ensure that the first steel rope 5 and the second steel rope 6 are both in an active state. It is not allowed to operate when the first steel rope 5 or the second steel rope 6 is locked.

[0065] After the first steel rope 5 and the second steel rope 6 have been operated, the rotating shaft 27 needs to be rotated so that the two sets of movable seats 29, which are symmetrically arranged at the bidirectional thread of the rotating shaft 27, move closer to each other. This allows the two sets of friction plates 33 to come into contact and clamp the corresponding second gear 26, so that the second gear 26 can be braked by sufficient friction. This prevents the first steel rope 5 and the second steel rope 6 from being retracted or extended, so that the extension ladder 2 can be in a stable state and have sufficient force capacity. The rotating shaft 27 can also be used by a motor and controller with a self-locking function.

[0066] Once the vertical ladder 1 is erected and the extension ladder 2 is adjusted and locked, rescuers can climb it to carry out rescue work. However, it is important to ensure that the highest point of the extension ladder 2 can be placed on a support. If it needs to be used in the air, the locking mechanism must be securely locked, and the weight on both ends of the extension ladder 2 must not exceed the bearing capacity of the first steel rope 5 and the second steel rope 6, as well as the locking force of the locking mechanism.

[0067] Additionally, when the extension ladder 2 is folded and stored, it will slide down the guide groove 9 along the roller 10. After the roller 10 moves to the end of the guide groove 9, it will hit the buffer plate 16. The buffer plate 16 will rotate under force and drive the piston 20 to move in the movable groove 19 through the connecting rod 18, thus compressing the buffer spring 21. The rubber pad 17 and the buffer spring 21 can absorb the impact force and buffer it, thereby avoiding hard bumps when the device is folded up, which will affect its service life. The above is the entire working principle of the present invention.

[0068] In the description of this application, it should be understood that the terms "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A rescue ladder with extendable and adjustable bending capabilities, characterized in that: The system includes a ground-supported ladder (1) and an extension ladder (2) located outside the ground-supported ladder (1). Positioning blocks (3) are provided on the lower sides of both ends of the extension ladder (2). Guide wheels (4) are provided on the upper and middle outer sides of the ground-supported ladder (1). Two sets of take-up and release wheels (7) are provided on the lower side of the ground-supported ladder (1). The positioning blocks (3) at both ends of the extension ladder (2) are fixedly connected to one end of a first steel rope (5) and a second steel rope (6), respectively. The first steel rope (5) and the second steel rope (6) pass over the two sets of guide wheels on the upper and middle sides of the ground-supported ladder (1), respectively. (4) Connected to two sets of retractable wheels (7); the extension ladder (2) slides on the vertical ladder (1) and can rotate via a sliding assembly. The sliding assembly includes two sets of guide grooves (9) parallel to each other on the inner side of the extension ladder (2) and rollers (10) slidably installed in the guide grooves (9). The rollers (10) are movably sleeved on the positioning shaft (11), and the positioning shaft (11) is laterally inserted into the upper end of the vertical ladder (1). Limiting mechanisms for restricting the sliding of the extension ladder (2) are provided on both sides of the upper end of the vertical ladder (1). The limiting mechanisms include The extension ladder (2) includes equidistant positioning holes (12) on its outer wall, the inner diameter of which is adapted to the outer diameter of the positioning shaft (11), and the outer end face of the positioning shaft (11) is rounded. A pin (13) is longitudinally inserted into the inner end of the positioning shaft (11), and a return spring (14) is sleeved on the lower side of the pin (13). The upper and lower ends of the return spring (14) abut against the lower side of the positioning shaft (11) and the lower end of the pin (13), respectively. The upper side crossbeam of the ladder (1) is provided with... There are two sets of slots (15) whose inner diameter is adapted to the outer diameter of the lower end of the pin (13), and the distance between the two sets of slots (15) is greater than or equal to the depth of the positioning hole (12); a buffer mechanism is provided on the upper side of the extension ladder (2); a transmission chamber (22) is provided on the lower side of the vertical ladder (1), and the two sets of take-up and release wheels (7) are rotatably installed on the outside of the transmission chamber (22). The transmission chamber (22) is provided with a drive assembly for rotating the take-up and release wheels (7) to take up and release the first steel rope (5) and the second steel rope (6), and a locking mechanism for limiting the drive assembly.

2. The extendable and bendable adjustable rescue ladder according to claim 1, characterized in that: The upper inner side of the ladder (1) is provided with a support base (8), and the support base (8) protrudes from the guide wheel (4).

3. The extendable and bendable adjustable rescue ladder according to claim 1, characterized in that: The positioning block (3) is rotatably mounted on the extension ladder (2), and the guide wheel (4) is rotatably mounted on the outer wall of the vertical ladder (1). An arc-shaped baffle for blocking the first steel rope (5) and the second steel rope (6) from coming off is provided on the outer side of the guide wheel (4), and the arc-shaped baffle is fixedly connected to the vertical ladder (1). An arc-shaped baffle for blocking the first steel rope (5) or the second steel rope (6) from coming off is provided on the lower side of the take-up and release wheel (7), and the arc-shaped baffle is fixedly connected to the transmission chamber (22).

4. The extendable and bendable adjustable rescue ladder according to claim 1, characterized in that: The first steel rope (5) passes over the guide wheel (4) on the upper side of the ladder (1) near the side of the ladder (1) and is wound and fixed from the outside of the take-up and release wheel (7) on the side away from the ladder (1). The second steel rope (6) passes over the guide wheel (4) in the middle position of the ladder (1) away from the side of the ladder (1) and is wound and fixed from the outside of the take-up and release wheel (7) on the side close to the ladder (1). The first steel rope (5) and the second steel rope (6) are wound in opposite directions and away from the two sets of take-up and release wheels (7).

5. The extendable and bendable adjustable rescue ladder according to claim 1, characterized in that: The buffer mechanism includes a buffer plate (16) rotatably mounted on the upper inner wall of the extension ladder (2). The outer concave wall of the buffer plate (16) and the inner wall of the guide groove (9) are both glued with rubber pads (17) for buffering. A connecting rod (18) is rotatably mounted on the end of the buffer plate (16) away from the rotation point. An movable groove (19) communicating with the guide groove (9) is opened inside the upper end of the extension ladder (2). A piston (20) connected to the end of the connecting rod (18) away from the buffer plate (16) is provided in the movable groove (19). A buffer spring (21) with both ends abutting against the piston (20) and the inner wall of the movable groove (19) is provided in the movable groove (19).

6. The extendable and bendable adjustable rescue ladder according to claim 1, characterized in that: The drive assembly includes two sets of first transmission rods (23) and second transmission rods (25) mounted in the transmission chamber (22) by bearings. The two sets of second transmission rods (25) are mounted in the two sets of transmission chambers (22) by bearings. The two sets of first transmission rods (23) are respectively connected to two sets of take-up and release wheels (7). A first gear (24) is mounted on the first transmission rod (23). A second gear (26) meshing with the first gear (24) is mounted on the second transmission rod (25). A crank handle (28) is provided at the outer end of the second transmission rod (25).

7. The extendable and bendable adjustable rescue ladder according to claim 1, characterized in that: The locking mechanism includes a rotating shaft (27) rotatably mounted between the two sets of transmission chambers (22). Each end of the rotating shaft (27) is provided with a crank handle (28). Both ends of the rotating shaft (27) are provided with bidirectional threads. Two sets of movable seats (29) are symmetrically arranged along the bidirectional threads of the rotating shaft (27). The two sets of movable seats (29) are respectively positioned on both sides of the second gear (26). A clamping plate (30) is provided on the opposite side of each set of movable seats (29). The clamping plate (30) rests against... Guide rods (31) are equidistantly arranged at one end of the movable seat (29). The guide rods (31) are movably inserted into the movable seat (29), and the outer diameter of the end of the guide rods (31) is larger than the hole diameter on the movable seat (29). A compression spring (32) is provided on the guide rods (31), and the two ends of the compression spring (32) abut against the movable seat (29) and the clamping plate (30) respectively. Friction plates (33) for friction locking the second gear (26) are provided on the opposite side surfaces of the two sets of clamping plates (30).

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