A wall-mounted flip-around ladder structure

Abstract

A wall-mounted, flip-up ladder structure includes a main ladder and a flip-up ladder. The upper end of the main ladder is hinged to the tailboard of a fire truck body via an upper hinge mechanism, and the lower end of the main ladder is hinged to the upper end of the flip-up ladder via a lower hinge mechanism. The lower end of the flip-up ladder is a free end, which can be flipped upwards to fit against the main ladder or flipped downwards to unfold. The structure is characterized by: an adjustable two-stage diagonal brace support mechanism in the middle of the ladder body and a locking / unlocking mechanism for the flip-up ladder. The adjustable diagonal brace support mechanism is located between the tailboard of the fire truck body and the lower end of the main ladder. The locking / unlocking mechanism for the flip-up ladder is located below it, with one end fixed to the tailboard of the fire truck body and the other end capable of locking and unlocking the upper end of the flip-up ladder. This reduces the load on the top of the main ladder, improves the bending resistance of the lower part of the main ladder and the upper part of the flip-up ladder, allows adjustment of the ladder's tilt angle relative to the ground, disperses the shear force and torque generated by personnel climbing the ladder under load, and suppresses ladder swaying and displacement. The locking / unlocking mechanism for the flip-up ladder allows it to be flipped upwards and reliably locked against the main ladder when not in use.

Description

Technical Field

[0001] This invention relates to the field of auxiliary facilities technology for fire trucks, and in particular to a wall-mounted flip-up ladder structure installed at the rear of a fire truck body. Background Technology

[0002] The rear ladder of a fire truck is an important auxiliary facility, mainly installed at the rear of the fire truck, but sometimes also on the side. It allows firefighters to climb to the roof platform to perform tasks such as operating fire monitors, retrieving equipment, and maintaining the vehicle. As fire trucks become increasingly equipped, the equipment on the roof platform is increasing, leading to more stringent requirements for the frequency of use and load-bearing capacity of the rear ladder.

[0003] The existing fire truck rear ladders mainly have the following structural forms: First, fixed ladders, which are directly welded or bolted to the truck body wall. Since they are usually arranged vertically, they are difficult to climb and lack safety. Second, single-section flip ladders, where the entire ladder flips around the top pivot and is stored against the truck body wall. However, the ladder length is limited and there is no central support when unfolded, making the long ladder prone to bending deformation. Third, double-fold flip ladders, which consist of a main ladder and a flip ladder hinged together. When stored, the flip ladder folds back up against the main ladder, effectively shortening the storage length. However, double-fold flip ladders generally use a single full spring or a single strut for support, with the top hinge bearing the entire overturning moment. This results in concentrated load, easy damage, and a lack of effective bending support for the middle of the ladder.

[0004] Chinese patent application publication number CN121803149A discloses a "folding and tilting rear ladder structure for a fire truck," which adopts a double-folding structure of a main ladder and a tilting ladder, with a support frame and a gas spring assist mechanism installed between the upper end of the tilting ladder and the rear panel of the truck body. However, the support frame in this design is hinged at the upper end of the tilting ladder (the hinge point between the two ladder sections), which is a single-point auxiliary support at the end. The gas spring only provides assistance and is not a load-bearing and bending-resistant component. The entire overturning moment and bending load of the ladder body are still borne by the main ladder hinge frame at the top, failing to solve the problems of load concentration at the top hinge axis and insufficient bending resistance in the middle of the ladder body. In addition, the unfolding angle of this design is determined by the fixed length of the support frame and cannot be adjusted according to ground height and usage requirements.

[0005] Authorization announcement number CN221879282U discloses "a rear ladder for fire trucks", which adopts a three-level structure of fixed ladder, inclined ladder and telescopic ladder, and a folding support device is set on the inner side of the bottom of the inclined ladder. This solution has a complex structure, many hinge points, and many failure points. Moreover, the folding support device is located at the bottom of the ladder and does not bear the bending load in the middle.

[0006] In summary, existing fire truck rear ladders have the following technical problems: First, the support system is mostly single-stage, with concentrated load on the top hinge shaft, making it prone to damage; second, there is a lack of effective bending support in the middle of the ladder body, making the long ladder body prone to bending and deformation during use; third, the unfolding angle is not adjustable or the adjustment mechanism is complex, resulting in poor environmental adaptability; and fourth, there is a lack of effective locking for the tilting ladder when it is in the non-use state after tilting upwards. Summary of the Invention

[0007] The objective of this invention is to provide a wall-mounted flip-up ladder structure that, when in its unfolded state, allows the main ladder to form a triangular force-bearing system with two levels of support through a top hinge and an adjustable lower support. This system reduces the load on the top of the main ladder and enhances the bending resistance between the lower part of the main ladder and the upper part of the flip-up ladder. It also facilitates the adjustment of the ladder's inclination angle as needed, allowing for changes in the ladder's inclination angle relative to the ground. Furthermore, it disperses the shear force and torque generated when firefighters climb the ladder with heavy loads and prevents the ladder from swaying or shifting during use. Finally, it reliably locks the flip-up ladder in its non-use, upward-flipped state, ensuring safety.

[0008] The present invention achieves its objective by providing a wall-mounted, flip-up ladder structure, comprising a main ladder and a flip-up ladder. The upper end of the main ladder is hinged to the tail section of a fire truck body via an upper hinge mechanism, and the lower end of the main ladder is hinged to the upper end of the flip-up ladder via a lower hinge mechanism. The lower end of the flip-up ladder is configured to flip upwards towards the main ladder to rest against it or flip downwards to leave the main ladder and eventually rest on the ground. The invention is characterized by further including a two-stage adjustable diagonal brace support mechanism in the middle of the ladder body and a flip-up ladder locking / unlocking mechanism. The two-stage adjustable diagonal brace support mechanism is located between the tail section of the fire truck body and the lower end of the main ladder. The flip-up ladder locking / unlocking mechanism is located below the two-stage adjustable diagonal brace support mechanism, with one end facing the tail section of the fire truck body fixed to it, and the other end facing the flip-up ladder locked or unlocked to the upper end of the flip-up ladder.

[0009] In a specific embodiment of the present invention, the main ladder includes a left main ladder beam, a right main ladder beam, a left main ladder auxiliary beam, a right main ladder auxiliary beam, a handrail, and main ladder treads. A hinge block is fixed to the upper end of the left main ladder beam, and this hinge block is hinged to the main ladder upper hinge mechanism via a hinge block bushing. A hinge block is also fixed to the upper end of the right main ladder beam, and this hinge block is hinged to the main ladder upper hinge mechanism via a hinge block bushing. The left main ladder auxiliary beam is located to the right of the left main ladder beam and is parallel to the length direction of the left main ladder beam. The right auxiliary beam of the main staircase is located to the right of the right side beam of the main staircase and is parallel to the length direction of the right side beam. The handrail of the main staircase is hinged to the middle of the right side beam along its length. The main staircase treads are arranged in a spaced-out group, with the left end of each tread engaging with the left side beam and the left auxiliary beam, and the right end engaging with the right side beam and the right auxiliary beam. The tilting staircase includes a left side beam, a right side beam, a left auxiliary beam, a right auxiliary beam, a handrail, and treads. When the tilting staircase is in a downward tilting state, the upper end face of the left side beam corresponds to the lower end face of the left side beam of the main staircase. The left side beam of the rotating staircase is supported on the ground, and the upper end face of the right side beam of the rotating staircase corresponds to and contacts the lower end face of the right side beam of the main staircase. The lower end of the right side beam of the rotating staircase is supported on the ground. The left auxiliary beam of the rotating staircase is located to the right of the left side beam of the rotating staircase and is parallel to the length direction of the left side beam. The rotating staircase is located to the right of the right side beam of the rotating staircase and is parallel to the length direction of the right side beam. The handrail of the rotating staircase is hinged to the middle of the length direction of the right side beam. The rotating staircase steps are arranged in a spaced-out group, and the left end of the rotating staircase step is engaged with the left side beam and the left auxiliary beam of the rotating staircase, while the right end is engaged with... The right side beam and the right auxiliary beam of the flip-up ladder are interlocked. The lower end of the left auxiliary beam of the main ladder and the upper end of the left auxiliary beam of the flip-up ladder, as well as the lower end of the right auxiliary beam of the main ladder and the upper end of the right auxiliary beam of the flip-up ladder, are hinged by the lower hinge mechanism of the main ladder. The lower ends of the left and right auxiliary beams of the flip-up ladder are supported on the ground. The two-stage adjustable diagonal brace in the middle of the ladder body is hinged to the lower ends of the left and right beams of the main ladder. The locking and unlocking mechanism of the flip-up ladder is locked or unlocked with the upper ends of the left and right auxiliary beams of the flip-up ladder facing each other.

[0010] In another specific embodiment of the present invention, the main ladder hinge mechanism includes a main ladder hinge bearing and a main ladder hinge shaft. The middle part of the main ladder hinge bearing is fixed to the tail plate of the fire truck body. The left end of the main ladder hinge bearing is bent forward at a right angle to form a left fixing ear with a left hinge shaft hole. The right end of the main ladder hinge bearing is also bent forward at a right angle to form a right fixing ear with a right hinge shaft hole. The left end of the main ladder hinge shaft is fixed to the left fixing ear at the position of the left hinge shaft hole, and the right end passes through the right hinge shaft hole from left to right and is fixed to the right fixing ear. The hinge block on the left side beam of the main ladder is hinged to the left end of the main ladder hinge shaft through the hinge block bushing on the left side beam of the main ladder. The hinge block on the right side beam of the main ladder is hinged to the right end of the main ladder hinge shaft through the hinge block bushing on the right side beam of the main ladder.

[0011] In another specific embodiment of the present invention, the main ladder lower hinge mechanism includes a left hinge device disposed between the lower end of the left auxiliary beam of the main ladder and the upper end of the left auxiliary beam of the tilting ladder, and a right hinge device disposed between the lower end of the right auxiliary beam of the main ladder and the upper end of the right auxiliary beam of the tilting ladder. The structure of the main ladder left hinge device and the main ladder right hinge device is the same. The main ladder right hinge device includes a left hinge plate, a right upper hinge lug, a right lower hinge lug, a hinge shaft on the hinge plate, and a hinge shaft below the hinge plate. The upper end of the plate corresponds to the lower left side of the right auxiliary beam of the main ladder, while the lower end of the right hinge plate corresponds to the upper left side of the right auxiliary beam of the tilting ladder. The upper right hinge lug is fixed to the lower end of the right auxiliary beam of the main ladder and corresponds to the upper end of the left hinge plate. The lower right hinge lug is fixed to the upper end of the right auxiliary beam of the tilting ladder and corresponds to the lower end of the left hinge plate. The upper end of the left hinge plate is hinged to the upper right hinge lug by the hinge shaft on the hinge plate, and the lower end of the left hinge plate is hinged to the lower right hinge lug by the hinge shaft on the hinge plate.

[0012] In another specific embodiment of the present invention, the adjustable diagonal brace two-stage support mechanism in the middle of the ladder body includes a left adjustment plate, a right adjustment plate, a left adjustment diagonal brace, a right adjustment diagonal brace, a connecting crossbar, a left adjustment diagonal brace hinge seat, and a right adjustment diagonal brace hinge seat. The left and right adjustment plates are parallel in the left and right longitudinal directions while maintaining a distance between them, and each is fixed to the rear panel of the fire truck body by fasteners. The left adjustment plate has left adjustment diagonal brace adjustment holes spaced apart from top to bottom, and the right adjustment plate has right adjustment diagonal brace adjustment holes spaced apart from top to bottom. The rear end of the left adjustment diagonal brace is adjusted corresponding to the left adjustment diagonal brace adjustment. The hole is inserted into the left adjusting hole plate, and the front end of the left adjusting diagonal brace is hinged to the left adjusting diagonal brace hinge seat. The rear end of the right adjusting diagonal brace is inserted into the right adjusting hole plate at the position corresponding to the right adjusting diagonal brace adjusting hole, and the front end of the right adjusting diagonal brace is hinged to the right adjusting diagonal brace hinge seat. There is a set of connecting crossbars, which are fixed at intervals between the opposing sides of the left and right adjusting diagonal braces. The left adjusting diagonal brace hinge seat is fixed to the lower right side of the left beam of the main ladder, and the right adjusting diagonal brace hinge seat is fixed to the lower left side of the right beam of the main ladder. The tilting ladder locking and unlocking mechanism is located below the left and right adjusting hole plates.

[0013] In another specific embodiment of the present invention, a left adjusting hole plate fixing flange is formed on each side of the left adjusting hole plate in the height direction. Fastener holes for the left adjusting hole plate fixing flange are spaced apart from top to bottom on the left adjusting hole plate fixing flange. Fasteners are used to fix the left adjusting hole plate fixing flange to the rear panel of the vehicle body at positions corresponding to the fastener holes. Similarly, a right adjusting hole plate fixing flange is formed on each side of the right adjusting hole plate in the height direction. Fastener holes for the right adjusting hole plate fixing flange are spaced apart from top to bottom on the right adjusting hole plate fixing flange. Fasteners are used to fix the right adjusting hole plate fixing flange to the rear panel of the vehicle body at positions corresponding to the fastener holes. The fasteners are screws or bolts.

[0014] In a further specific embodiment of the present invention, the tilting ladder locking and unlocking mechanism includes a bracket, a left spring sleeve, a left pin, a right spring sleeve, a right pin, a left pin seat, and a right pin seat. The bracket is located below the left and right adjustment hole plates and is fixed to the rear panel of the carriage by screws. A left arm of the bracket is formed by bending forward at a right angle at the left end, and a right arm of the bracket is formed by bending forward at a right angle at the right end, parallel to the left arm. The left spring sleeve is fixed to the front end of the left arm of the bracket, and the left pin is designed for insertion and removal. On the left spring sleeve, the left spring located inside the left spring sleeve is fitted onto the left pin. The left pin end of the left pin is locked or unlocked with the left pin seat. The right spring sleeve is fixed to the front end of the right arm of the bracket. The right pin is inserted and removed from the right spring sleeve. The right spring located inside the right spring sleeve is fitted onto the right pin. The right pin end of the right pin is locked or unlocked with the right pin seat. The left pin seat is fixed to the upper right side of the left auxiliary beam of the tilting ladder. The right pin seat corresponds to the left pin seat and is fixed to the upper left side of the right auxiliary beam of the tilting ladder.

[0015] In a further specific embodiment of the present invention, the left end of the main ladder step is engaged with the left side beam and the left auxiliary beam of the main ladder in the same way as the right end of the main ladder step is engaged with the right side beam and the right auxiliary beam of the main ladder. A main ladder right side beam step slot is provided on the right side beam of the main ladder, and a main ladder right auxiliary beam step slot is provided on the right auxiliary beam of the main ladder. A main ladder right side beam step slot engaging foot and a main ladder right auxiliary beam step slot engaging foot are formed at the right end of the main ladder step. The main ladder right side beam step slot engaging foot engages with the main ladder right side beam step slot, and the main ladder right auxiliary beam step slot engaging foot engages with the main ladder right auxiliary beam step slot. The installation method of the tilting ladder step is the same as the installation method of the main ladder step.

[0016] In yet another specific embodiment of the present invention, holes or anti-slip flanges are provided at intervals on the main ladder tread and the flip ladder tread.

[0017] In yet another specific embodiment of the present invention, a left support foot connecting plate is connected to the lower end face of the left side beam and the left auxiliary beam of the tilting ladder, and a left support foot is connected to the bottom of the left support foot connecting plate. A right support foot connecting plate is connected to the lower end face of the right side beam and the right auxiliary beam of the tilting ladder, and a right support foot is connected to the bottom of the right support foot connecting plate.

[0018] The technical advantages of the solution provided by this invention are as follows: Due to the addition of an adjustable diagonal brace in the middle of the ladder body, a triangular force-bearing system with two levels of support is formed, reducing the top load of the main ladder and enhancing the bending resistance between the lower part of the main ladder and the upper part of the tilting ladder. Furthermore, it facilitates the adjustment of the inclination angle of the ladder body formed by the main ladder and the tilting ladder as needed, thereby changing the inclination angle of the ladder body relative to the ground. This disperses the shear force and torque generated by firefighters climbing the ladder under load and prevents the ladder from swaying or shifting during use. The added tilting ladder locking and unlocking mechanism can lock or unlock the tilting ladder, satisfying the requirement that the tilting ladder can be reliably locked against the main ladder during non-use periods. Attached Figure Description

[0019] Figure 1 This is a structural diagram of an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of part A; Figure 3 for Figure 1 The diagram shows the structural system of the tilting ladder locking and unlocking mechanism, in which the left spring sleeve is fixed to the front end of the left arm 611 of the bracket. Figure 4 This is a schematic diagram showing the main ladder tread of the main ladder 1 being connected to the left side beam of the main ladder, the left auxiliary beam of the main ladder, the right side beam of the main ladder, and the right auxiliary beam 14 of the main ladder. Figure 5 This is a schematic diagram illustrating the present invention when the tilting ladder is flipped to the main ladder in a non-use state and locked by the tilting ladder locking and unlocking mechanism.

[0020] In the diagram: 1. Main staircase; 11. Left side beam of the main staircase; 111. Hinge block on the left side beam of the main staircase; 1111. Hinge block bushing on the left side beam of the main staircase; 12. Right side beam of the main staircase; 121. Hinge block on the right side beam of the main staircase; 1211. Hinge block bushing on the right side beam of the main staircase; 122. Slide slot on the right side beam of the main staircase; 13. Left auxiliary beam of the main staircase; 14. Right auxiliary beam of the main staircase; 141. Slide slot on the right auxiliary beam of the main staircase; 15. Handrail of the main staircase; 16. Main staircase tread; 161. Slide slot and locking foot on the right side beam of the main staircase; 162. Slide slot and locking foot on the right auxiliary beam of the main staircase; 2. Tilting staircase; 21. Left side beam of the tilting staircase; 22. Right side beam of the tilting staircase; 23. Left auxiliary beam of the tilting staircase; 24. Right auxiliary beam of the tilting staircase; 25. Handrail of the tilting staircase; 26. 1. Tilting ladder tread; 27. Left support leg connecting plate; 271. Left support leg; 28. Right support leg connecting plate; 281. Right support leg; 3. Main ladder upper hinge mechanism; 31. Main ladder upper hinge shaft seat; 311. Left fixed ear; 3111. Left hinge shaft hole; 312. Right fixed ear; 3121. Right hinge shaft hole; 32. Main ladder upper hinge shaft; 4. Main ladder lower hinge mechanism; 41. Left hinge device; 42. Right hinge device; 421. Left hinge plate; 422a. Right upper hinge ear; 422b. Right lower hinge ear; 423. Hinge shaft on hinge plate; 424. Hinge shaft below hinge plate; 5. Adjustable diagonal brace two-stage support mechanism in the middle of the ladder body; 51. Left adjusting hole plate; 511. 512. Left adjusting diagonal brace adjustment hole; 5121. Left adjusting hole plate fixing flange; 52. Right adjusting hole plate; 521. Right adjusting diagonal brace adjustment hole; 522. Right adjusting hole plate fixing flange; 5221. Right adjusting hole plate fixing flange fastener hole; 53. Left adjusting diagonal brace; 54. Right adjusting diagonal brace; 55. Connecting crossbar; 56. Left adjusting diagonal brace hinge seat; 57. Right adjusting diagonal brace hinge seat; 6. Tilting ladder locking and unlocking mechanism; 61. Bracket; 611. Left arm of bracket; 6111. Left arm bend of bracket; 612. Right arm of bracket; 6121. Right arm bend of bracket; 62. Left spring sleeve; 63. Left pin; 631. Left pin end; 64. Right spring sleeve; 65. 651. Right pin end; 66. Left pin seat; 67. Right pin seat; 671. Right pin hole; 7. Fire truck body; 71. Rear panel of the truck body. Detailed Implementation

[0021] In order to better understand the technical essence and beneficial effects of the present invention, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the present invention. Any formal but not substantive equivalent transformations made based on the concept of the present invention should be considered within the scope of the present invention.

[0022] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on the current... Figure 1 The location and state of the object are examples, and therefore should not be construed as a special limitation on the technical solution provided by the present invention.

[0023] Please see Figure 1 The diagram shows a main ladder 1 and a tilting ladder 2. The upper end of the main ladder 1 is hinged to the tail plate 71 of the fire truck body 7 via the upper hinge mechanism 3 of the main ladder. The lower end of the main ladder 1 is hinged to the upper end of the tilting ladder 2 via the lower hinge mechanism 4 of the main ladder. The lower end of the tilting ladder 2 is configured to tilt upward toward the main ladder 1 to be close to the main ladder 1 or tilt downward away from the main ladder 1 until it is supported on the ground.

[0024] The key technical points of the technical solution provided by the present invention include: a two-stage adjustable diagonal brace support mechanism 5 in the middle of the ladder body and a flip ladder locking and unlocking mechanism 6. The two-stage adjustable diagonal brace support mechanism 5 in the middle of the ladder body is located between the aforementioned tail plate 71 of the carriage and the lower end of the aforementioned main ladder 1. The flip ladder locking and unlocking mechanism 6 is located below the two-stage adjustable diagonal brace support mechanism 5 in the middle of the ladder body, and one end facing the tail plate 71 of the carriage is fixed to the tail plate 71 of the carriage, while the other end facing the aforementioned flip ladder 2 is locked or unlocked to the upper end of the flip ladder 2.

[0025] The aforementioned main ladder 1 includes a left side beam 11, a right side beam 12, a left auxiliary beam 13, a right auxiliary beam 14, a handrail 15, and a tread 16. A hinge block 111 is fixed to the upper end of the left side beam 11, and this hinge block 111 is rotatably hinged to the aforementioned upper hinge mechanism 3 via a hinge block bushing 1111. A hinge block 121 is fixed to the upper end of the right side beam 12, and this hinge block 121 is rotatably hinged to the aforementioned upper hinge mechanism 3 via a hinge block bushing 1211. The left auxiliary beam 13 is located to the right of the left side beam 11 and is parallel to the length of the left side beam 11 (or...). Parallel to the "height direction" (hereinafter referred to as the same), the right auxiliary beam 14 of the main ladder is located to the right of the right auxiliary beam 12 of the main ladder and is parallel to the length direction (also referred to as the "height direction") of the right auxiliary beam 12 of the main ladder. The handrail 15 of the main ladder is hinged to the middle of the length direction of the right auxiliary beam 12 of the main ladder. There is a set of main ladder treads 16 distributed at intervals, and the left end of the main ladder tread 16 is engaged with the left auxiliary beam 11 and the left auxiliary beam 13 of the main ladder, while the right end is engaged with the right auxiliary beam 12 and the right auxiliary beam 14 of the main ladder. The aforementioned tilting ladder 2 includes the left auxiliary beam 21, the right auxiliary beam 22, the left auxiliary beam 23, the right auxiliary beam 24, the handrail 25, and the treads 26 of the tilting ladder. The tilting ladder 2 is in the downward tilting use state (i.e., in Figure 1In the indicated state, the upper end face of the left beam 21 of the tilting ladder corresponds to and contacts the lower end face of the left beam 11 of the main ladder. The lower end of the left beam 21 is supported on the ground. The upper end face of the right beam 22 of the tilting ladder corresponds to and contacts the lower end face of the right beam 12 of the main ladder. The lower end of the right beam 22 is supported on the ground. The left auxiliary beam 23 of the tilting ladder is located to the right of the left beam 21 and is parallel to the length direction of the left beam 21. The tilting ladder 24 is located to the right of the right beam 22 and is parallel to the length direction of the right beam 22. The handrail 25 of the tilting ladder is hinged to the middle of the right beam 22 along its length. The treads 26 of the tilting ladder are arranged in a spaced-out group, and the left end of the treads 26 is connected to the left side of the tilting ladder. The side beam 21 and the left auxiliary beam 23 of the flip ladder are engaged, while the right end is engaged with the right side beam 22 and the right auxiliary beam 24 of the flip ladder. The lower end of the left auxiliary beam 13 of the main ladder and the upper end of the left auxiliary beam 23 of the flip ladder, as well as the lower end of the right auxiliary beam 14 of the main ladder and the upper end of the right auxiliary beam 24 of the flip ladder, are hinged by the lower hinge mechanism 4 of the main ladder. The lower ends of the left auxiliary beam 23 and the right auxiliary beam 24 of the flip ladder are supported on the ground. The adjustable diagonal brace two-stage support mechanism 5 in the middle of the ladder body is hinged to the lower ends of the left side beam 11 and the right side beam 12 of the main ladder. The locking and unlocking mechanism 6 of the flip ladder is locked or unlocked to the upper ends of the left auxiliary beam 23 and the right auxiliary beam 24 of the flip ladder facing each other.

[0026] The aforementioned main ladder upper hinge mechanism 3 includes a main ladder upper hinge bearing 31 and a main ladder upper hinge shaft 32. The middle part of the main ladder upper hinge bearing 31 is fixed to the rear panel 71 of the aforementioned fire truck body 7. The left end of the main ladder upper hinge bearing 31 is bent forward at a right angle to form a left fixing lug 311 with a left hinge shaft hole 3111. The right end of the main ladder upper hinge bearing 31 is also bent forward at a right angle to form a right fixing lug 312 with a right hinge shaft hole 3121. The left end of the main ladder upper hinge shaft 32 is... The aforementioned left hinge shaft hole 3111 is fixed to the left fixed ear 311, and the right end passes through the aforementioned right hinge shaft hole 3121 from left to right and is fixed to the aforementioned right fixed ear 312; the aforementioned hinge block 111 on the left side beam of the main ladder is hinged to the left end of the aforementioned hinge shaft 32 on the main ladder through the aforementioned hinge block bushing 1111 on the left side beam of the main ladder, and the aforementioned hinge block 121 on the right side beam of the main ladder is hinged to the right end of the aforementioned hinge shaft 32 on the main ladder through the aforementioned hinge block bushing 1211 on the right side beam of the main ladder.

[0027] Please see Figure 2 And combined Figure 1The aforementioned main ladder lower hinge mechanism 4 includes a left hinge device 41 disposed between the lower end of the left auxiliary beam 13 of the main ladder and the upper end of the left auxiliary beam 23 of the tilting ladder, and a right hinge device 42 disposed between the lower end of the right auxiliary beam 14 of the main ladder and the upper end of the right auxiliary beam 24 of the tilting ladder. Since the structure of the main ladder left hinge device 41 and the main ladder right hinge device 42 is the same, the applicant will only describe the main ladder right hinge device 42 in detail below. The main ladder right hinge device 42 includes a left hinge plate 421, a right upper hinge ear 422a, a right lower hinge ear 422b, a hinge shaft 423 on the hinge plate and a hinge shaft 424 on the lower hinge plate. The upper end of the connecting plate 421 corresponds to the lower left side of the right auxiliary beam 14 of the main ladder, while the lower end of the right hinge plate 421 corresponds to the upper left side of the right auxiliary beam 24 of the tilting ladder. The upper right hinge ear 422a is fixed to the lower end of the right auxiliary beam 14 of the main ladder and corresponds to the upper end of the left hinge plate 421. The lower right hinge ear 422b is fixed to the upper end of the right auxiliary beam 24 of the tilting ladder and corresponds to the lower end of the left hinge plate 421. The upper end of the left hinge plate 421 is hinged to the upper right hinge ear 422a by the hinge shaft 423 on the hinge plate, and the lower end of the left hinge plate 421 is hinged to the lower right hinge ear 422b by the lower hinge shaft 424 on the hinge plate.

[0028] Please stay tuned. Figure 1 The aforementioned adjustable diagonal brace two-stage support mechanism 5 in the middle of the ladder body includes a left adjustment hole plate 51, a right adjustment hole plate 52, a left adjustment diagonal brace 53, a right adjustment diagonal brace 54, a connecting crossbar 55, a left adjustment diagonal brace hinge seat 56, and a right adjustment diagonal brace hinge seat 57. The left adjustment hole plate 51 and the right adjustment hole plate 52 are parallel in the left and right longitudinal directions while maintaining a distance between them, and each is fixed to the rear panel 71 of the aforementioned fire truck body 7 by fasteners. The left adjustment hole plate 51 has left adjustment diagonal brace adjustment holes 511 spaced apart from top to bottom, and the right adjustment hole plate 52 has right adjustment diagonal brace adjustment holes 521 spaced apart from top to bottom. The rear end of the left adjustment diagonal brace 53 is inserted into the left adjustment hole plate 51 at the position corresponding to the left adjustment diagonal brace adjustment hole 511 (i.e., The left adjusting diagonal brace 53 is hinged to the left adjusting diagonal brace hinge seat 56, and the rear end of the right adjusting diagonal brace 54 is inserted into the right adjusting hole plate 52 at the position corresponding to the right adjusting diagonal brace adjusting hole 521 (i.e., "plug-in connection"). The front end of the right adjusting diagonal brace 54 is hinged to the right adjusting diagonal brace hinge seat 57. There is a set of connecting crossbars 55, which are fixed at intervals between the opposing sides of the left adjusting diagonal brace 53 and the right adjusting diagonal brace 54. The left adjusting diagonal brace hinge seat 56 is fixed to the lower right side of the aforementioned main ladder left beam 11, and the right adjusting diagonal brace hinge seat 57 is fixed to the lower left side of the aforementioned main ladder right beam 12. The aforementioned tilting ladder locking and unlocking mechanism 6 is located below the aforementioned left adjusting hole plate 51 and right adjusting hole plate 52.

[0029] Depend on Figure 1 As shown, a left adjusting hole plate fixing flange 512 is formed on each side of the aforementioned left adjusting hole plate 51 in the height direction. Fastener holes 5121 are spaced apart from top to bottom on the left adjusting hole plate fixing flange 512. Fasteners are used to fix the left adjusting hole plate fixing flange 512 to the aforementioned rear panel 71 at positions corresponding to the fastener holes 5121. Similarly, a right adjusting hole plate fixing flange 522 is formed on each side of the aforementioned right adjusting hole plate 52 in the height direction. Fastener holes 5221 are spaced apart from top to bottom on the right adjusting hole plate fixing flange 5221. Fasteners are used to fix the right adjusting hole plate fixing flange 522 to the aforementioned rear panel 71 at positions corresponding to the fastener holes 5221. The aforementioned fasteners are screws or bolts; in this embodiment, screws are used.

[0030] exist Figure 1 In the indicated usage state, the rear end of the left adjusting diagonal brace 53 can be adjusted according to actual needs to change its position in the left adjusting diagonal brace adjustment hole 511. At the same time, the rear end of the right adjusting diagonal brace 54 can be adjusted accordingly to change its position in the right adjusting diagonal brace adjustment hole 521. This changes the angle between the two-stage adjustable diagonal brace support mechanism 5 in the middle of the ladder body and the main ladder 1, or in other words, changes the torque.

[0031] Please still see Figure 1 And see Figure 3 The aforementioned tilting ladder locking and unlocking mechanism 6 includes a bracket 61, a left spring sleeve 62, a left pin 63, a right spring sleeve 64, a right pin 65, a left pin seat 66, and a right pin seat 67. The bracket 61 is located below the aforementioned left adjusting plate 51 and right adjusting plate 52 and is fixed to the aforementioned tail plate 71 of the carriage by screws. The left end of the bracket 61 is bent forward at a right angle to form a left arm 611, and the right end of the bracket 61 is bent forward at a right angle to form a right arm 612 parallel to the left arm 611. The left spring sleeve 62 is welded and fixed to the front side of the bent portion 6111 of the left arm 611 at the front end of the left arm 611. The left pin 63 is inserted and removed from the left spring sleeve 62. The left spring located inside the left spring sleeve 62 is fitted onto the left pin 63. The left pin end 631 of the left pin 63 is locked or unlocked with the left pin seat 66. The right spring sleeve 64 is welded and fixed to the front side of the right arm bend 6121 at the front end of the right arm 612 of the bracket. The right pin 63 is inserted and removed from the right spring sleeve 64. The right spring located inside the right spring sleeve 64 is fitted onto the right pin 65. The right pin end 651 of the right pin 65 is locked or unlocked with the right pin seat 67. The left pin seat 66 is fixed to the upper right side of the aforementioned left auxiliary beam 23 of the tilting ladder. The right pin seat 67 corresponds to the left pin seat 66 and is fixed to the upper left side of the aforementioned right auxiliary beam 24 of the tilting ladder.

[0032] Please see Figure 4 And combined Figure 1 Based on the applicant's above explanation and in conjunction with Figure 1 As shown in the structure, the way the left end of the aforementioned main ladder step 16 engages with the aforementioned left side beam 11 and left auxiliary beam 13 of the main ladder is the same as the way the right end of the main ladder step 16 engages with the aforementioned right side beam 12 and right auxiliary beam 14 of the main ladder. Therefore, the applicant will only specifically describe the engagement between the right end of the main ladder step 16 and the right side beam 12 and right auxiliary beam 14 of the main ladder below: A main ladder right side beam step slot 122 is provided on the main ladder right side beam 12, while on the aforementioned right auxiliary beam 14... The main ladder has a right auxiliary beam tread slot 141. At the right end of the main ladder tread 16, there are a right side beam tread slot engaging foot 161 and a right auxiliary beam tread slot engaging foot 162. The right side beam tread slot engaging foot 161 engages with the aforementioned right side beam tread slot 122, and the right auxiliary beam tread slot engaging foot 162 engages with the aforementioned right auxiliary beam tread slot 141. The installation method of the aforementioned tilting ladder tread 26 is the same as that of the aforementioned main ladder tread 16. In other words, after the applicant describes the installation of the main ladder tread 16, based on the principle of applying the same principle to other situations, the understanding of the installation of the tilting ladder tread 26 will not be confusing.

[0033] As a preferred embodiment, holes are provided at intervals on the main ladder tread 16 and the rotating ladder tread 26. These holes serve both a self-cleaning function (allowing adhering substances to fall through the holes) and an anti-slip function. Alternatively, anti-slip flanges can be provided at intervals on the upward-facing side of the main ladder tread 16 and the rotating ladder tread 26.

[0034] Preferably, a left support foot connecting plate 27 is used to connect the lower end face of the left side beam 21 and the left auxiliary beam 23 of the aforementioned tilting ladder, and a left support foot 271 is connected to the bottom of the left support foot connecting plate 27. A right support foot connecting plate 28 is used to connect the lower end face of the right side beam 22 and the right auxiliary beam 24 of the aforementioned tilting ladder, and a right support foot 281 is connected to the bottom of the right support foot connecting plate 28.

[0035] Please see Figure 5 , Figure 5 It is by Figure 1The upper end of the tilting ladder 2 flips upward at the positions of the aforementioned left hinge device 41 and right hinge device 42, that is, it flips towards the main ladder 1 until it is close to the main ladder 1. This state can also be called the non-dispatch, non-use folded standby state. The main ladder 1, together with the tilting ladder 2, is close to the rear panel 71 of the carriage. At this time, the left pin 63 and the right pin 65 are latched into the left pin hole (not shown in the figure) on the left pin seat 66 and the right pin hole 671 on the right pin seat 67 under the action of the springs located in the left spring sleeve 62 and the right spring sleeve 64 and respectively fitted on the left pin 63 and the right pin 65. Figure 1 (Shown). Simultaneously, in the aforementioned folded state, before folding, the rear ends of the left adjusting brace 53 and right adjusting brace 54 have been pulled out from the left adjusting brace adjustment hole 511 and right adjusting brace adjustment hole 521, respectively, and the left adjusting brace 53 and right adjusting brace 54 are flipped upwards to a position close to the rear side of the main ladder 1. Furthermore, when... Figure 5 The state shown expands to Figure 1 In the indicated state, by simultaneously applying opposite displacement to the left pin 63 and the right pin 65 using one thumb and one forefinger, a counterforce against the aforementioned spring is applied, causing the ends 631 and 651 of the left pin and right pin to simultaneously disengage from their respective holes 671. Then, the main ladder 1 and the tilting ladder 2 are pulled to... Figure 1 The state shown.

[0036] In summary, the technical solution provided by this invention makes up for the shortcomings of the prior art, successfully completes the invention task, and accurately realizes the technical effects described by the applicant in the above technical effects column.

Claims

1. A wall-mounted flip-up ladder structure, comprising a main ladder (1) and a flip-up ladder (2), wherein the upper end of the main ladder (1) is hinged to the tail plate (71) of a fire truck body (7) via an upper hinge mechanism (3), and the lower end of the main ladder (1) is hinged to the upper end of the flip-up ladder (2) via a lower hinge mechanism (4), wherein the lower end of the flip-up ladder (2) is configured to flip upward toward the main ladder (1) to abut against the main ladder (1) or flip downward to leave the main ladder (1) until it reaches a free end supported on the ground, characterized in that: It also includes a two-stage adjustable diagonal brace support mechanism (5) in the middle of the ladder body and a flip ladder locking and unlocking mechanism (6). The two-stage adjustable diagonal brace support mechanism (5) in the middle of the ladder body is located between the rear panel (71) of the carriage and the lower end of the main ladder (1). The flip ladder locking and unlocking mechanism (6) is located below the two-stage adjustable diagonal brace support mechanism (5) in the middle of the ladder body, and its end facing the rear panel (71) is fixed to the rear panel (71), while its end facing the flip ladder (2) is locked or unlocked to the upper end of the flip ladder (2).

2. The wall-mounted flip-up ladder structure according to claim 1, characterized in that: The main elevator (1) includes a left side beam (11), a right side beam (12), a left auxiliary beam (13), a right auxiliary beam (14), a handrail (15), and a tread (16). A hinge block (111) is fixed at the upper end of the left side beam (11), and the hinge block (111) is hinged to the upper hinge mechanism (3) of the main elevator through a hinge block bushing (1111). A hinge block (121) is fixed at the upper end of the right side beam (12), and the hinge block (121) is hinged to the upper hinge mechanism (3) of the main elevator through a hinge block bushing (1211). The left auxiliary beam (13) is located on the main elevator. The left auxiliary beam (14) of the main ladder is located to the right of the right auxiliary beam (12) of the main ladder and is parallel to the length direction of the left auxiliary beam (11) of the main ladder. The handrail (15) of the main ladder is hinged to the middle of the length direction of the right auxiliary beam (12) of the main ladder. There is a set of main ladder treads (16) with intervals. The left end of the main ladder tread (16) is engaged with the left auxiliary beam (11) of the main ladder and the left auxiliary beam (13) of the main ladder, while the right end is engaged with the right auxiliary beam (12) of the main ladder and the right auxiliary beam (14) of the main ladder. The flip ladder (2) includes the left auxiliary beam (21), the right auxiliary beam (22), the left auxiliary beam (23), the right auxiliary beam (24), and the handrail (15). Hand (25) and flip ladder step (26), flip ladder (2) is in the downward flipping state, the upper end face of the left beam (21) of the flip ladder corresponds to and contacts the lower end face of the left beam (11) of the main ladder, the lower end of the left beam (21) of the flip ladder is supported on the ground, the upper end face of the right beam (22) of the flip ladder corresponds to and contacts the lower end face of the right beam (12) of the main ladder, the lower end of the right beam (22) of the flip ladder is supported on the ground, the left auxiliary beam (23) of the flip ladder is located to the right of the left beam (21) of the flip ladder and is parallel to the length direction of the left beam (21) of the flip ladder, the flip ladder (24) is located to the right of the right beam (22) of the flip ladder and is parallel to the length direction of the right beam (22) of the flip ladder. The handrail (25) of the flip ladder is hinged to the middle of the right side beam (22) of the flip ladder along its length. There is a set of flip ladder steps (26) distributed at intervals. The left end of the flip ladder step (26) is engaged with the left side beam (21) of the flip ladder and the left auxiliary beam (23) of the flip ladder, while the right end is engaged with the right side beam (22) of the flip ladder and the right auxiliary beam (24) of the flip ladder. The lower end of the left auxiliary beam (13) of the main ladder and the upper end of the left auxiliary beam (23) of the flip ladder, as well as the lower end of the right auxiliary beam (14) of the main ladder and the upper end of the right auxiliary beam (24) of the flip ladder, are hinged by the lower hinge mechanism (4) of the main ladder. The lower ends of the left auxiliary beam (23) and the right auxiliary beam (24) of the flip ladder are supported on the ground.The adjustable diagonal brace two-stage support mechanism (5) in the middle of the ladder body is hinged to the lower ends of the left side beam (11) and the right side beam (12) of the main ladder; the locking and unlocking mechanism (6) of the flip ladder is locked or unlocked to the upper ends of the left auxiliary beam (23) and the right auxiliary beam (24) of the flip ladder facing each other.

3. The wall-mounted flip-up ladder structure according to claim 2, characterized in that: The main ladder hinge mechanism (3) includes a main ladder hinge bearing (31) and a main ladder hinge shaft (32). The middle part of the main ladder hinge bearing (31) is fixed to the rear panel (71) of the fire truck body (7). The left end of the main ladder hinge bearing (31) is bent forward at a right angle to form a left fixing lug (311) with a left hinge shaft hole (3111). The right end of the main ladder hinge bearing (31) is also bent forward at a right angle to form a right fixing lug (312) with a right hinge shaft hole (3121). The main ladder hinge shaft (32) The left end is fixed to the left fixed ear (311) at the position of the left hinge shaft hole (3111), and the right end passes through the right hinge shaft hole (3121) from left to right and is fixed to the right fixed ear (312); the hinge block (111) on the left side beam of the main ladder is hinged to the left end of the hinge shaft (32) of the main ladder through the hinge block bushing (1111) on the left side beam of the main ladder, and the hinge block (121) on the right side beam of the main ladder is hinged to the right end of the hinge shaft (32) of the main ladder through the hinge block bushing (1211) on the right side beam of the main ladder.

4. The wall-mounted flip-up ladder structure according to claim 2, characterized in that: The main ladder lower hinge mechanism (4) includes a left hinge device (41) disposed between the lower end of the left auxiliary beam (13) of the main ladder and the upper end of the left auxiliary beam (23) of the tilting ladder, and a right hinge device (42) disposed between the lower end of the right auxiliary beam (14) of the main ladder and the upper end of the right auxiliary beam (24) of the tilting ladder. The structure of the main ladder left hinge device (41) and the main ladder right hinge device (42) is the same. The main ladder right hinge device (42) includes a left hinge plate (421), a right upper hinge ear (422a), a right lower hinge ear (422b), a hinge shaft (423) on the hinge plate and a hinge shaft (424) on the hinge plate. The upper end of the left hinge plate (421) corresponds to the main ladder. The lower left end of the right auxiliary beam (14) is located on the left side, while the lower end of the right hinge plate (421) corresponds to the upper left end of the right auxiliary beam (24) of the flip ladder. The upper right hinge ear (422a) is fixed to the lower end of the right auxiliary beam (14) of the main ladder and corresponds to the upper end of the left hinge plate (421). The lower right hinge ear (422b) is fixed to the upper end of the right auxiliary beam (24) of the flip ladder and corresponds to the lower end of the left hinge plate (421). The upper end of the left hinge plate (421) is hinged to the upper right hinge ear (422a) by the hinge shaft (423) on the hinge plate, and the lower end of the left hinge plate (421) is hinged to the lower right hinge ear (422b) by the lower hinge shaft (424) on the hinge plate.

5. The wall-mounted flip-up ladder structure according to claim 2, characterized in that: The adjustable diagonal brace two-stage support mechanism (5) in the middle of the ladder body includes a left adjustment hole plate (51), a right adjustment hole plate (52), a left adjustment diagonal brace (53), a right adjustment diagonal brace (54), a connecting crossbar (55), a left adjustment diagonal brace hinge seat (56), and a right adjustment diagonal brace hinge seat (57). The left adjustment hole plate (51) and the right adjustment hole plate (52) are parallel to each other in the left and right longitudinal directions while maintaining a distance between them, and each is fixed to the rear panel (71) of the fire truck body (7) by fasteners. The left adjustment hole plate (51) is provided with left adjustment diagonal brace adjustment holes (511) spaced apart from top to bottom, and the right adjustment hole plate (52) is provided with right adjustment diagonal brace adjustment holes (521) spaced apart from top to bottom. The rear end of the left adjustment diagonal brace (53) is positioned corresponding to the left adjustment diagonal brace adjustment hole (511) and is aligned with the left adjustment diagonal brace. The joint plate (51) is inserted, and the front end of the left adjusting diagonal brace (53) is hinged to the left adjusting diagonal brace hinge seat (56). The rear end of the right adjusting diagonal brace (54) is inserted into the right adjusting hole plate (52) at the position corresponding to the right adjusting diagonal brace adjusting hole (521). The front end of the right adjusting diagonal brace (54) is hinged to the right adjusting diagonal brace hinge seat (57). There is a set of connecting crossbars (55) fixed at intervals between the left adjusting diagonal brace (53) and the right adjusting diagonal brace (54) on opposite sides. The left adjusting diagonal brace hinge seat (56) is fixed to the lower right side of the left side beam (11) of the main ladder. The right adjusting diagonal brace hinge seat (57) is fixed to the lower left side of the right side beam (12) of the main ladder. The flip ladder locking and unlocking mechanism (6) is located below the left adjusting hole plate (51) and the right adjusting hole plate (52).

6. The wall-mounted flip-up ladder structure according to claim 5, characterized in that: A left adjustment hole plate fixing flange (512) is formed on each side of the left adjustment hole plate (51) in the height direction. The left adjustment hole plate fixing flange (512) is provided with left adjustment hole plate fixing flange fastener holes (5121) spaced apart from top to bottom. The left adjustment hole plate fixing flange (512) is fixed to the rear panel (71) of the carriage by fasteners at the positions corresponding to the left adjustment hole plate fixing flange fastener holes (5121). A right adjustment hole plate fixing flange (522) is formed on each side of the right adjustment hole plate (52) in the height direction. The right adjustment hole plate fixing flange (522) is provided with right adjustment hole plate fixing flange fastener holes (5221) spaced apart from top to bottom. The right adjustment hole plate fixing flange (522) is fixed to the rear panel (71) of the carriage by fasteners at the positions corresponding to the right adjustment hole plate fixing flange fastener holes (5221). The fasteners are screws or bolts.

7. The wall-mounted flip-up ladder structure according to claim 5, characterized in that: The tilting ladder locking and unlocking mechanism (6) includes a bracket (61), a left spring sleeve (62), a left pin (63), a right spring sleeve (64), a right pin (65), a left pin seat (66), and a right pin seat (67). The bracket (61) is located below the left adjusting plate (51) and the right adjusting plate (52) and is fixed to the rear panel (71) of the carriage by screws. The left end of the bracket (61) is bent forward at a right angle to form a left arm (611), and the right end of the bracket (61) is bent forward at a right angle to form a right arm (612) parallel to the left arm (611). The left spring sleeve (62) is fixed to the front end of the left arm (611), and the left pin (63) is inserted and removed from the left spring sleeve (62). On the left spring sleeve (62), the left spring is placed on the left pin (63). The left pin end (631) of the left pin (63) is locked or unlocked with the left pin seat (66). The right spring sleeve (64) is fixed to the front end of the right arm (612) of the bracket. The right pin (63) is inserted and removed from the right spring sleeve (64). The right spring is placed on the right pin (65) inside the right spring sleeve (64). The right pin end (651) of the right pin (65) is locked or unlocked with the right pin seat (67). The left pin seat (66) is fixed to the upper right side of the left auxiliary beam (23) of the tilting ladder. The right pin seat (67) corresponds to the left pin seat (66) and is fixed to the upper left side of the right auxiliary beam (24) of the tilting ladder.

8. The wall-mounted flip-up ladder structure according to claim 2, characterized in that: The left end of the main ladder step (16) is engaged with the left side beam (11) and the left auxiliary beam (13) of the main ladder in the same way that the right end of the main ladder step (16) is engaged with the right side beam (12) and the right auxiliary beam (14) of the main ladder. A main ladder right side beam step slot (122) is provided on the main ladder right side beam (12), and a main ladder right auxiliary beam step slot (141) is provided on the main ladder right auxiliary beam (14). The right end of the main ladder has a main ladder right side beam tread slot and a main ladder right auxiliary ...

9. A wall-mounted flip-up ladder structure according to claim 8, characterized in that: Holes or anti-slip flanges are provided at intervals on the main ladder tread (16) and the tilting ladder tread (26).

10. A wall-mounted flip-up ladder structure according to claim 2, characterized in that: The lower end face of the left beam (21) and the left auxiliary beam (23) of the flip ladder is connected by a left support foot connecting plate (27), and a left support foot (271) is connected to the bottom of the left support foot connecting plate (27). The lower end face of the right beam (22) and the right auxiliary beam (24) of the flip ladder is connected by a right support foot connecting plate (28), and a right support foot (281) is connected to the bottom of the right support foot connecting plate (28).

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