Folding turnover type rear ladder stand structure of fire fighting truck

Abstract

The invention discloses a folding turnover type rear ladder stand structure of a fire fighting truck and belongs to the technical field of auxiliary facilities of fire fighting trucks. The fire fighting truck comprises a carriage tail plate, the folding turnover type rear crawling ladder structure comprises a main ladder hinge frame, and the main ladder hinge frame is fixed to the upper portion of the right side face of the carriage tail plate. The upper end of the main ladder is hinged with the main ladder hinging frame; the upper end of the overturning ladder is hinged to the lower end of the main ladder, the lower end of the overturning ladder is overturned upwards to be attached to the right side of the main ladder in a non-use state, and the overturning ladder and the main ladder are locked or unlocked through a ladder locking mechanism arranged between the main ladder and one side of the overturning ladder; the supporting frame and the pair of power assisting mechanisms are hinged between the upper end of the overturning ladder and the lower portion of the right side face of the compartment tail plate in a mutual accompanying state. The ladder has the advantages that the operation is labor-saving, and the safety of ladder climbing personnel is guaranteed; it is ensured that the lower end of the overturning ladder is supported in place, and excellent supporting reliability is embodied; the situation that the vehicle is abnormally opened under the bumpy road condition can be completely eradicated; the structure is simple, and manufacturing and operation are convenient.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of auxiliary facilities of fire fighting vehicles, in particular to a folding and overturning type rear ladder structure of a fire fighting vehicle. BACKGROUND

[0002] From the above description of the rear ladder, it can be known that it is installed at the tail of the fire fighting vehicle in the use state, that is, at the tail of the vehicle, for the fire fighting personnel to climb to the roof platform or to take fire fighting equipment from the inside of the equipment box. In the disclosed Chinese patent documents, there are some technical information related to the rear ladder of the fire fighting vehicle, typically like the "automobile rear ladder" recommended in the authorized announcement No. CN221879282U, which is composed of a fixed ladder, an inclined ladder and an extension ladder. The fixed ladder is fixedly connected to the upper part of the rear end of the fire fighting vehicle, the inclined ladder is rotatably connected to the bottom end of the fixed ladder, and a folding support device is rotatably connected to the inner side of the bottom end of the inclined ladder. The folding support device is fixed on the fire fighting vehicle, the extension ladder is rotatably connected to the outer side of the bottom end of the inclined ladder, and a limiting rod connected to the rear end of the fire fighting vehicle is arranged on the inner side of the inclined ladder. The patent structure can objectively realize the technical effects described in the 0013 paragraph of the specification. However, there are the following defects: first, the connecting rod folding support device composed of the first folding rod, the second folding rod, the reinforcing connecting rod and the fixed support is adopted, and manual folding and angle fixing are realized through the use of the latch and the limiting groove, so that the support structure is relatively complex and there are many hinged points between the rod members; second, the extension ladder is rotatably connected or hingedly connected to the outer side of the bottom end of the inclined ladder, and the function depends on manual operation to fold down to the ground or to fold up, so that there is no power-assisted component, which makes the operation laborious and prone to failure due to human negligence; third, since the stability mainly depends on the support of the multi-link support device to the lower part of the inclined ladder, and the locking after folding is realized by the separate limiting rod, the stability in the unfolded use state is relatively lacking; fourth, since the surface limiting is only realized by the external limiting rod and the limiting bolt, the locking reliability is low, and there is no internal positioning structure between the ladder bodies, which is prone to looseness in bumpy road conditions; fifth, since the fixed ladder, the inclined ladder and the extension ladder constitute a three-level structure, and the extension ladder needs additional overturning operation, the structure is relatively complex, and the complexity of the structure is proportional to the number of fault points. SUMMARY

[0003] The objective of this invention is to provide a folding and flipping rear ladder structure for a fire truck that helps provide auxiliary power to the main ladder and the flipping ladder, and when the main ladder and the flipping ladder are unfolded, they can form a rigid and stable support system together, thereby reducing the effort required for operation and ensuring the safety of firefighters climbing the ladder. It also helps to significantly extend the effective climbing length of the flipping ladder when it is unfolded relative to the main ladder, and can form a stable whole to ensure that the flipping ladder is properly supported and demonstrates excellent support reliability. Furthermore, it helps to ensure that the main ladder and the flipping ladder are reliably locked together when they are in a folded standby state, thereby preventing abnormal opening caused by loosening when the vehicle is traveling on bumpy roads. Finally, it significantly simplifies the structure and enhances the ease of operation.

[0004] The objective of this invention is achieved as follows: a folding and flipping rear ladder structure for a fire truck, the fire truck including a rear cargo box, the folding and flipping rear ladder structure including a main ladder hinge frame fixed to the upper part of the right side of the rear cargo box; a main ladder, the upper end of which is hinged to the main ladder hinge frame; a flipping ladder, the upper end of which is hinged to the lower end of the main ladder, and the lower end of the flipping ladder, in a non-use state, flips upward to abut the right side of the main ladder, and is locked or unlocked to the main ladder by a locking mechanism disposed between the main ladder and the flipping ladder on one side; a support frame and a pair of assisting mechanisms, the support frame and the pair of assisting mechanisms being hinged together. Connected between the upper end of the tilting ladder and the lower part of the right side of the tailgate of the carriage, when the locking mechanism releases the lock between the tilting ladder and the main ladder and manually applies force to the lower end of the tilting ladder to rotate to its limit in the direction away from the main ladder, a trapezoidal space with a narrow upper part and a wide lower part is formed between the main ladder, the tilting ladder and the right side of the tailgate of the carriage. The end of the support frame and the pair of assisting mechanisms that are hinged to the upper end of the tilting ladder unfolds away from the tailgate of the carriage, while the lower end of the tilting ladder is close to the right side of the main ladder. When the main ladder and the tilting ladder return to the direction of the tailgate of the carriage, the end of the support frame and the pair of assisting mechanisms that are hinged to the upper end of the tilting ladder retracts towards the tailgate of the carriage.

[0005] In a specific embodiment of the present invention, a tailgate cavity is formed at the rear or front of the right side of the tailgate and along the height direction of the tailgate. The main ladder hinge frame is located in the tailgate cavity. In the use state, the main ladder and the tilting ladder extend out of the tailgate cavity. In the non-use state, the main ladder and the tilting ladder return to the direction of the tailgate cavity. The support frame and the end of the pair of assisting mechanisms that are hinged to the upper end of the tilting ladder retract towards the tailgate cavity.

[0006] In another specific embodiment of the present invention, the main ladder hinge frame is disposed at the upper part of the rear panel recess of the carriage in the height direction. The middle part of the main ladder hinge frame is fixed to the bottom wall of the rear panel recess of the carriage by a set of main ladder hinge frame fixing bolts. A main ladder hinge frame front arm is formed on the front side of the main ladder hinge frame, and a main ladder hinge frame rear arm is formed on the rear side of the main ladder hinge frame at the position of the main ladder hinge frame front arm. The upper end of the main ladder is hinged to the right end of the main ladder hinge frame front arm and the main ladder hinge frame rear arm.

[0007] In another specific embodiment of the present invention, the main ladder includes a front column, a rear column, and treads. The front and rear columns are aligned with each other in height. A front column hinge seat is disposed at the upper end of the front column. The lower part of the front column hinge seat has a pair of front column hinge seat inserts that are aligned with each other. These inserts are inserted into a pair of front column cavities and are each fixed by a front column hinge seat fixing screw. The upper end of the front column hinge seat extends upward and is hinged to the right end of the front arm of the main ladder hinge frame via a front column hinge pin. A rear column hinge seat is disposed at the upper end of the rear column. The lower end has a pair of hinged feet for the main ladder rear column, which are inserted into the cavities of the main ladder rear column and are fixed by the hinged feet fixing screws. The upper end of the main ladder rear column hinged feet extends upward and is hinged to the right end of the rear arm of the main ladder hinge frame through the main ladder rear column hinge pin. There is a set of main ladder steps, each fixed between the front and rear columns of the main ladder at intervals by main ladder step fixing screws. When the flip ladder is in a folded state and not in use, its lower end flips upward to abut against the right side of the front and rear columns of the main ladder, and the locking mechanism locks the flip ladder to the front or rear column of the main ladder.

[0008] In another specific embodiment of the present invention, the width of the tilting ladder is equal to the width of the main ladder. The tilting ladder includes a front column, a rear column, and a tread. The front and rear columns are corresponding to each other. There is a set of treads, each fixed between the front and rear columns on opposite sides by tread fixing screws at intervals. When the lower end of the tilting plate is flipped upward to a position close to the right side of the main ladder, the right sides of the front and rear columns of the tilting ladder are close to the front and rear columns of the main ladder, respectively. The locking mechanism locks the front column of the tilting ladder to the front column of the main ladder or the rear column of the tilting ladder to the rear column of the main ladder.

[0009] In another specific embodiment of the present invention, a set of hinged brackets for a rotating ladder is fixed to the upper front side of the front column of the rotating ladder and the upper rear side of the rear column of the rotating ladder by a set of hinged bracket screws. The left ends of the two hinged brackets protrude from the left side of the front column and the rear column of the rotating ladder, respectively, and are hinged to the lower ends of the front column and the rear column of the main ladder by a hinged bracket hinge shaft.

[0010] In a further specific embodiment of the present invention, a main ladder column lower hinge seat is provided at the lower end of each of the front and rear columns of the main ladder. The upper ends of each pair of main ladder column lower hinge seats form a pair of main ladder column lower hinge seat pins. Each pair of main ladder column lower hinge seat pins is inserted into the cavity of the front and rear columns of the main ladder and is fixed by a set of main ladder column lower hinge seat pin fixing screws. The lower ends of the pair of main ladder column lower hinge seats protrude from the cavity of the front and rear columns of the main ladder, respectively. The hinge shaft of the tilting ladder column hinge seat is hinged to the lower end of the main ladder column lower hinge seat. A locking pin hole is provided at the left end of the pair of tilting ladder column hinge seats, and a main ladder column hinge seat pin hole is provided at the lower end of the pair of main ladder column lower hinge seats at a position corresponding to the locking pin hole. The upper end of the tilting ladder and the lower end of the main ladder are locked or unlocked by the locking pin being inserted into or removed from the locking pin hole and the main ladder column hinge seat pin hole.

[0011] In a further specific embodiment of the present invention, a lower hinge seat of a support frame is inserted and fixed at the upper end of the front column and the rear column of the tilting ladder, and a pair of upper hinge seats of a support frame are fixed on the bottom wall of the rear panel cavity of the carriage and at the position corresponding to the upper left of the lower hinge seat of the support frame by fixing bolts of the upper hinge seat of the support frame. The front and rear sides of the support frame facing the tilting ladder are each hinged to the opposite side of the pair of lower hinge seats of the support frame by a lower hinge pin, and the front and rear sides of the support frame facing the pair of upper hinge seats of the support frame are hinged to the opposite side of the pair of upper hinge seats of the support frame by a upper hinge pin.

[0012] In yet another specific embodiment of the present invention, each of the pair of assist mechanisms includes a gas spring cylinder. The right end of the gas spring cylinder cylinder column forms a cylinder column hinge joint, which is hinged to the lower hinge seat of the support frame. The left end of the gas spring cylinder body forms a cylinder body hinge joint, which is hinged to the upper hinge seat of the support frame.

[0013] In yet another specific embodiment of the present invention, the locking mechanism includes a hook shaft seat, a hook, a hook head engaging shaft seat, a hook head engaging shaft, and a tension spring. The hook shaft seat is fixed to the lower front side of the main ladder's front column in the height direction by a pair of hook shaft seat fixing screws. One end of the hook facing the front column of the main ladder is pivotally mounted on the hook shaft, which is fixed to the hook shaft seat. One end of the hook facing the front column of the tilting ladder forms a hook head, which corresponds to and engages with the hook head engaging shaft. The hook head engaging shaft seat is fixed to the rear side of the tilting ladder's front column at a position corresponding to the hook shaft seat by a pair of hook head engaging shaft seat fixing screws. The hook head engaging shaft is fixed to the hook head engaging shaft seat. One end of the tension spring is fixed to a hook head tension spring positioning ear formed on the hook head, and the other end of the tension spring is fixed to a hook shaft seat tension spring fixing ear formed on the hook shaft seat.

[0014] One of the technical effects of the present invention is that, because a pair of assisting mechanisms are set between the upper end of the tilting ladder and the right side of the rear panel of the vehicle, it is beneficial to provide auxiliary power to the main ladder and the tilting ladder. When the main ladder and the tilting ladder are unfolded, they can form a rigid and stable support system together, which not only saves effort in operation but also ensures the safety of firefighters climbing the ladder. Secondly, because the tilting ladder can significantly extend the effective climbing length relative to the main ladder in the unfolded state and can form a stable whole, it can ensure that the lower end of the tilting ladder is supported in place and demonstrates excellent support reliability. Thirdly, because the locking mechanism reliably locks the tilting ladder and the main ladder in the standby state when they are in the folded state, it can prevent abnormal opening caused by loosening when the vehicle is traveling on bumpy roads. Fourthly, because the overall structure is simple, it is convenient to manufacture and operate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an embodiment of the present invention; Figure 2 for Figure 1 Detailed structural diagrams of the main ladder and the inverted ladder are shown; Figure 3 for Figure 1 and Figure 2 The diagram shows the structural system of the main staircase, with the main staircase treads fixed to the front column of the main staircase. Figure 4 for Figure 2 The detailed structural diagram of the locking mechanism is shown. Figure 5 This is a schematic diagram of the present invention in use.

[0016] In the diagram: 1. Carriage tail panel; 11. Carriage tail panel recess; 111. Hinge seat on support frame; 1111. Hinge seat fixing bolt on support frame; 2. Main ladder hinge frame; 21. Main ladder hinge frame fixing bolt; 22. Main ladder hinge frame front arm; 23. Main ladder hinge frame rear arm; 3. Main ladder; 31. Main ladder front column; 311. Main ladder front column hinge seat; 3111. Main ladder front column hinge seat insert fixing screw; 3112. Main ladder front column hinge pin; 312. Main ladder front column cavity; 32. Main ladder rear column; 321. Main ladder rear column hinge seat; 3211. Main ladder rear column hinge seat insert fixing screw; 3212. Main ladder rear column hinge pin; 322. 33. Main ladder rear column cavity; 331. Main ladder tread; 331. Main ladder tread fixing screw; 3311. Locking nut; 34. Main ladder column lower hinge seat; 341. Main ladder lower hinge seat pin fixing screw; 4. Tilting ladder; 41. Tilting ladder front column; 42. Tilting ladder rear column; 43. Tilting ladder tread; 431. Tilting ladder tread fixing screw; 44. Tilting ladder column hinge seat; 441. Tilting ladder column hinge seat screw; 442. Tilting ladder column hinge seat hinge shaft; 443. Locking pin hole; 45. Support frame lower hinge seat; 5. Locking mechanism; 51. Lock hook shaft seat; 511. Lock hook shaft seat fixing screw; 5111. Washer; 512. Lock hook shaft seat tension spring fixing lug; 52. Lock hook; 521. Lock hook shaft; 522. 5221. Locking hook head; 53. Locking hook head hook fitting shaft seat; 531. Locking hook head hook fitting shaft seat fixing screw; 5311. Washer; 54. Locking hook head hook fitting shaft; 55. Tension spring; 6. Support frame; 61. Support frame lower hinge pin; 62. Support frame upper hinge pin; 7. Power assist mechanism; 71. Gas spring cylinder; 711. Gas spring cylinder cylinder column; 7111. Cylinder column hinge joint; 72. Cylinder body hinge joint; 8. Buffer pad; 9. Nylon cable tie. Detailed Implementation

[0017] 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.

[0018] In the following description, except for the top of the flip-up ladder 4 facing downwards, all other concepts involving up, down, left, right, front, and back are based on... 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.

[0019] Please see Figure 1and Figure 2 And combined Figure 5 The diagram shows a fire truck's structural system, including a rear cargo box 1 and a main ladder hinge frame 2 of a folding and flipping rear ladder system. The main ladder hinge frame 2 is fixed to the upper right side of the aforementioned rear cargo box 1. A main ladder 3 is shown, its upper end hinged to the aforementioned main ladder hinge frame 2. A flipping ladder 4 is shown, its upper end hinged to the lower end of the aforementioned main ladder 3. When not in use, the lower end of the flipping ladder 4 flips upwards to rest against the right side of the aforementioned main ladder 3, and is locked to the main ladder 3 by a locking mechanism 5 located between the main ladder 3 and the flipping ladder 4 on one side. Figure 1 (as shown) or unlocked (as indicated) Figure 5 The diagram shows a support frame 6 and a pair of assist mechanisms 7, which are hinged together between the upper end of the aforementioned tilting ladder 4 and the lower part of the right side of the aforementioned rear panel 1. When the aforementioned locking mechanism 5 releases the lock between the aforementioned tilting ladder 4 and the aforementioned main ladder 3 and manually applies a tilting force to the lower end of the tilting ladder 4 in a direction away from the main ladder 3 to the limit state (also known as the "limit degree"), it is in the state of... Figure 5 In the state shown, the main elevator 3, together with the tilting elevator 4, forms a trapezoidal space that is narrower at the top and wider at the bottom with the right side of the aforementioned rear panel 1 of the carriage (see...). Figure 5 As shown), and the aforementioned support frame 6 and a pair of assist mechanisms 7 are hinged to the upper end of the tilting ladder 4, extending (or "spreading out") away from the rear panel 1 of the carriage. Figure 5 In the indicated state, the lowest step 43 of the tilting ladder 4 (which will be mentioned later) maintains a kick distance of less than 500mm from the ground. That is, in use, the lower end of the tilting ladder 4 is suspended above the ground. When the lower end of the tilting ladder 4 is against the right side of the main ladder 3, the main ladder 3, along with the tilting ladder 4, returns to an upright position towards the rear panel 1 of the carriage. Furthermore, the support frame 6 and the pair of assist mechanisms 7, hinged to the upper end of the tilting ladder 4, retract towards the rear panel 1 of the carriage, thus forming... Figure 1 The state shown.

[0020] The applicant's concept of the support frame 6 and the pair of assisting mechanisms 7 mentioned above as being in a state of mutual accompaniment means that both ends of the two are hinged together between the same component located below the upper end of the tilting ladder 4 (to be described in detail below) and the same component located below the lower right side of the tail panel 1 of the carriage (to be described in detail below).

[0021] A tailgate cavity 11 is formed at the rear right side of the aforementioned tailgate 1, along the height direction of the tailgate 1. The aforementioned main ladder hinge frame 2 is located within the aforementioned tailgate cavity 11. In the use state, the aforementioned main ladder 3, together with the aforementioned tilting ladder 4, extends outward from the aforementioned tailgate cavity 11. In the non-use state, the main ladder 3, together with the tilting ladder 4, returns to the direction of the tailgate cavity 11, and the aforementioned support frame 6 and the end of the pair of assist mechanisms 7 that are hinged to the upper end of the tilting ladder 4 retract towards the direction of the tailgate cavity. The aforementioned state is... Figure 1 The current state.

[0022] Based on professional knowledge, the central area of ​​the rear panel 1 of a fire truck is typically equipped with a single door, a double door, or a roller shutter door. Therefore, while avoiding the aforementioned central area, a recessed cavity is formed in the height direction of the area behind the single door, double door, or roller shutter door to conceal the folding ladder structure of this invention. Of course, if necessary, the aforementioned rear panel cavity 111 can also be located in the area in front of the aforementioned single door, double door, or roller shutter door. In short, the change in the position of the aforementioned rear panel cavity 111 should not be considered as deviating from the scope of the technical content disclosed in this invention.

[0023] See you later Figure 1 and Figure 2 The aforementioned main ladder hinge frame 2 is located at the upper part of the aforementioned rear panel cavity 11 in the height direction. The middle part of the main ladder hinge frame 2 is fixed to the bottom wall of the rear panel cavity 11 of the aforementioned rear panel cavity 11 by a set of main ladder hinge frame fixing bolts 21. A main ladder hinge frame front arm 22 is formed on the front side of the main ladder hinge frame 2, and a main ladder hinge frame rear arm 23 is formed on the rear side of the main ladder hinge frame 2 at the position of the main ladder hinge frame front arm 22. The upper end of the aforementioned main ladder 3 is hinged to the right end of the main ladder hinge frame front arm 22 and the main ladder hinge frame rear arm 23.

[0024] Please pay attention. Figure 2 and Figure 3 The aforementioned main ladder 3 includes a front main ladder column 31, a rear main ladder column 32, and a main ladder tread 33. The front and rear main ladder columns 31 and 32 are corresponding to each other in the height direction. A main ladder front ladder hinge seat 311 is arranged at the upper end of the main ladder front ladder column 31. The lower part of the main ladder front ladder hinge seat 311 forms a pair of main ladder front ladder hinge seat inserts (not shown in the figure) that are corresponding to each other in the front and rear. The pair of main ladder front ladder hinge seat inserts are inserted into a pair of main ladder front ladder column cavities 312 of the main ladder front ladder column 31. Figure 3 (as shown) and each is fixed by a hinged base with a 3111 screw (as shown) Figure 1(Shown) is fixed, and the upper end of the main ladder front column hinge seat 311 extends upward and is hinged to the right end of the aforementioned main ladder hinge frame front arm 22 via the main ladder front column hinge pin 3112. A main ladder rear column hinge seat 321 is arranged at the upper end of the main ladder rear column 32. The lower end of the main ladder rear column hinge seat 321 forms a pair of main ladder rear column hinge seat inserts that are corresponding to each other. The pair of main ladder rear column hinge seat inserts are inserted into a pair of main ladder rear column cavities 322 of the main ladder rear column 32. Figure 2 (As shown) and each is fixed by the hinge seat of the rear column of the main ladder with the insert foot fixing screw 3211. The upper end of the hinge seat of the rear column of the main ladder 321 extends upward and is hinged to the right end of the rear arm 23 of the aforementioned main ladder hinge frame through the hinge pin 3212 of the rear column of the main ladder. There is a set of main ladder steps 33, and each is fixed between the front and rear columns 31 and 32 of the main ladder with the main ladder step fixing screw 331 equipped with locking nuts 3311 at intervals. When the aforementioned flip ladder 4 is in the folded state when not in use, its lower end flips upward to abut against the right side of the aforementioned front column 31 and rear column 32 of the main ladder, and the aforementioned locking mechanism 5 locks the flip ladder 4 to the front column 31 or the rear column 32 of the main ladder. As a preferred embodiment, the left and right ends of the main ladder step 33 extend out to the left and right sides between the front and rear columns 31 and 32 of the main ladder, respectively. When the flip ladder 4 and the main ladder 3 are folded and not in use, the main ladder step 33 is tilted with the left side higher than the right side. When the flip ladder 4 and the main ladder 3 are unfolded and in use, the main ladder step 33 is horizontal.

[0025] See you later Figure 2 The width of the aforementioned flip ladder 4 is equal to the width of the aforementioned main ladder 3. The flip ladder 4 includes a front column 41, a rear column 42, and a flip ladder step 43. The front and rear columns 41 and 42 correspond to each other. There is a set of flip ladder steps 43, and each is fixed between the front and rear columns 41 and 42 at intervals by flip ladder step fixing screws 431. When the lower end of the aforementioned flip plate 4 flips upward to a state that is close to the right side of the aforementioned main ladder 3, the right sides of the aforementioned front and rear columns 41 and 42 of the flip ladder are close to the front and rear columns 31 and 32 of the aforementioned main ladder, respectively. The aforementioned locking mechanism 5 locks the front column 41 of the flip ladder to the front column 31 of the main ladder or locks the rear column 42 of the flip ladder to the rear column 32 of the main ladder. As a preferred embodiment, the left and right ends of the flip ladder step 43 extend out from the left and right sides between the front and rear uprights 41 and 42 of the flip ladder, respectively. In the non-use state where the flip ladder 4 and main ladder 3 are folded, the flip ladder step 43 is tilted with the left side higher than the right. When the flip ladder 4 and main ladder 3 are in the unfolded use state, the flip ladder step 43 is horizontal. Figure 1 and Figure 2As can be seen from the diagram, the position of the flip ladder step 43 is offset from that of the main ladder step 33 to avoid interference when the flip ladder 4 folds into the main ladder 3.

[0026] See the key points Figure 1 And combined Figure 5 A set of hinge seat screws 441 is fixed to the upper front side of the aforementioned front column 41 of the tilting ladder and the upper rear side of the aforementioned rear column 42 of the tilting ladder through a set of hinge seat screws 441. The left ends of the hinge seat 44 protrude from the left side of the front column 41 and the rear column 42 of the tilting ladder, respectively, and are hinged to the lower ends of the aforementioned front column 31 and the rear column 32 of the main ladder through the hinge seat hinge shaft 442.

[0027] A main ladder column lower hinge seat 34 is provided at the lower end of the aforementioned main ladder front column 31 and main ladder rear column 32. The upper ends of each pair of main ladder column lower hinge seats 34 form a pair of main ladder lower hinge seat pins. Each pair of main ladder lower hinge seat pins is inserted into the aforementioned main ladder front and rear column cavities 312 and 322 and is fixed by a set of main ladder lower hinge seat pin fixing screws 341. The lower ends of the pair of main ladder column lower hinge seats 34 protrude from the main ladder front and rear column cavities 312 and 322, respectively. The aforementioned flip-up ladder column... The hinge shaft 442 of the column hinge seat is hinged to the lower end of the lower hinge seat 34 of the main ladder column; wherein, a locking pin hole 443 is provided at the left end of the aforementioned pair of hinge seats 44 of the rotating ladder column, and a main ladder column hinge seat pin hole is provided at the lower end of the aforementioned pair of lower hinge seats 34 of the main ladder column at the position corresponding to the locking pin hole 443. The upper end of the rotating ladder 4 and the lower end of the main ladder 3 are locked or unlocked by inserting or withdrawing the locking pin hole 443 and the main ladder column hinge seat pin hole.

[0028] See you later Figure 1 and Figure 2 And combined Figure 5A lower hinge seat 45 of the support frame is inserted and fixed to the upper end of the front column 41 and the rear column 42 of the aforementioned tilting ladder 4. A pair of upper hinge seats 111 of the support frame are fixed to the bottom wall of the rear panel cavity 11 of the aforementioned carriage, corresponding to the upper left of the lower hinge seat 45, by bolts 1111. The front and rear sides of the support frame 6 facing the tilting ladder 4 are hinged to the opposite sides of the pair of lower hinge seats 45 by lower hinge pins 61. The end of the support frame 6 facing the pair of upper hinge seats 111... The front and rear sides are hinged to each other on opposite sides of a pair of support frame hinge seats 111 via hinge pins 62 on the support frame; each of the aforementioned pair of assist mechanisms 7 includes a gas spring cylinder 71 (also called "gas spring", "compression spring" or "lifting gas spring"). The right end of the gas spring cylinder 71's cylinder column 711 (i.e. "gas spring column") forms a cylinder column hinge joint 7111, which is hinged to the aforementioned support frame lower hinge seat 45. The left end of the cylinder body of the gas spring cylinder 71 forms a cylinder body hinge joint 72, which is hinged to the aforementioned support frame upper hinge seat 111.

[0029] Please see Figure 4 The aforementioned locking mechanism 5 includes a hook shaft seat 51, a hook 52, a hook head hook fitting shaft seat 53, a hook head hook fitting shaft 54, and a tension spring 55. The hook shaft seat 51 is fixed to the lower front side of the main ladder front column 31 of the aforementioned main ladder 3 by a pair of hook shaft seat fixing screws 511 and with washers 5111. One end of the hook 52 facing the main ladder front column 31 is pivotally mounted on the hook shaft 521, and the hook shaft 521 is fixed on the hook shaft seat 51. One end of the hook 52 facing the aforementioned tilting ladder front column 41 of the tilting ladder 4 forms a hook head 522. The locking hook head 522 corresponds to the locking hook head hook shaft 54 ​​and is engaged or disengaged. The locking hook head hook shaft seat 53 is fixed to the rear side of the aforementioned front column 41 of the tilting ladder by a pair of locking hook head hook shaft seat fixing screws 531 in the position corresponding to the locking hook shaft seat 51 and with washers 5311. The locking hook head hook shaft 54 ​​is fixed on the locking hook head hook shaft seat 53. One end of the tension spring 55 is fixed on the locking hook head tension spring positioning ear 5221 formed on the locking hook head 522, while the other end of the tension spring 55 is fixed on the locking hook shaft seat tension spring fixing ear 512 formed on the locking hook shaft seat 51.

[0030] As explained by the applicant above, the aforementioned locking mechanism 5, due to its position, serves to lock or unlock the front upright 41 of the tilting escalator and the front upright 31 of the main elevator. Following the principle of applying this principle to other situations, by changing the position of the locking mechanism 5, it can also lock the rear upright 42 of the tilting escalator and the rear upright 32 of the main elevator.

[0031] Preferably, a buffer pad 8 is fixed on the left side of the front column 31 and the rear column 32 of the main ladder 3, and at a position corresponding to the upper left of the support frame 6 facing the lower hinge seat 45 of the support frame. The buffer pad 8 is made of rubber.

[0032] Please see Figure 5 And combined Figures 1 to 4 The applicant briefly describes the use of the present invention, when the folding and flipping rear ladder structure system of the present invention is to be combined with the flipping ladder 4 and the main ladder 3. Figure 1 The non-use state shown is expanded to present Figure 5 When in use as shown, the locking mechanism 5 should first be manually disengaged from the tilting ladder 4 by firefighters. Specifically, the hook head 522 of the locking hook 52 should be manually pushed upwards, overcoming the reaction force of the tension spring 55, causing the hook head 522 to disengage from the hook head engaging shaft 54. Then, the aforementioned pin inserted into the locking pin hole 443 should be pulled out, that is, the pin (spring pin) should be disengaged from the locking pin hole. Furthermore, if there is a nylon cable tie 9 ( Figure 2 (As shown) If the front and rear uprights 41 and 42 of the tilting ladder 4 are secured to the front and rear uprights 31 and 32 of the main ladder 3, then use tools to release the nylon cable ties 9. Next, firefighters will remove the lower end of the tilting ladder 4 ( Figure 1 (As shown in the diagram) It flips downwards or outwards, that is, it flips in the direction away from the main ladder 3. The flip ladder 4 rotates clockwise around the hinge shaft 442 of the hinge seat of the flip ladder column. During this process, the lower hinge seat 45 of the support frame at the upper end of the flip ladder 4 rotates around the lower hinge pin 61 of the support frame, causing the gas spring cylinder 71 (i.e., "gas spring") of the pair of power mechanism 7 to compress and store energy. At the same time, driven by the support frame 6, it rotates counterclockwise around the hinge shaft 62 of the support frame, causing the main ladder 3 to rotate counterclockwise around the hinge pins 3112 and 3212 of the front and rear columns of the main ladder under the action of the support frame 6, and unfolds to the right side of the car tail plate cavity 11 away from the car tail plate 1, that is, the car tail plate cavity 11 is exposed. In the aforementioned process, a pair of gas spring cylinders 71 rotate counterclockwise around the cylinder hinge joint 72 in an energy-storing state. When they rotate beyond the horizontal state, that is, when they reach the inflection point, the cylinder pins 711 of the pair of gas spring cylinders pop out, pushing the lower hinge seat 45 of the support frame to further flip and abut against the buffer pad 8. The main ladder 3 and the tilting ladder 4 form a structure composed of... Figure 5 The unfolded state is shown. (As described above) Figure 5 In the unfolded state shown, the main elevator 3, together with the tilting elevator 4, forms a trapezoidal space that is narrower at the top and wider at the bottom between the right side of the rear panel 1 of the carriage. The main elevator 3 and the tilting elevator 4 are in a... Figure 5The tilted state is shown. Furthermore, the lowest step 43 of the tilting ladder 4, located between the front and rear uprights 41 and 42, has a kick distance of less than 500mm from the ground. Firefighters can climb upwards step by step from the tilting ladder step 43 and then the main ladder step 3 until they reach the top of the carriage, where they can carry out firefighting operations such as operating the fire monitor, etc.

[0033] After the rescue mission is completed, the tilting ladder 4 and the main ladder 3 will be restored to their original positions. Figure 1 The current state, that is, the state in which... Figure 5 The status shown has returned to Figure 1 The specific operation is as follows: The tilting ladder 4 is pulled upwards, causing it to rotate counterclockwise around the hinge axis 442 of the tilting ladder column hinge seat. The gas spring cylinders 71 of the pair of assist mechanisms 7 compress the gas spring cylinder column 711 through the lower hinge seat 45 of the support frame, causing it to rotate counterclockwise around the cylinder column hinge joint 7111. During this rotation, the support frame 6 rotates clockwise around the upper hinge axis 62 of the support frame. When the gas spring cylinder 71 rotates to the point where the gas spring cylinder column 711 can pop out (i.e., beyond the inflection point), the gas spring cylinder column 711 pops out and pushes the lower hinge seat 45 of the support frame and the tilting ladder 4 to further rotate counterclockwise around the hinge axis 442 of the tilting ladder column hinge seat until it reaches the desired position. Figure 1 In the state shown, the aforementioned locking mechanism 5 is then operated to lock the tilting ladder 4 and the main ladder 3, and then the aforementioned pin is returned (i.e. inserted) into the locking pin hole 443 to reliably lock the tilting ladder 4 and the main ladder 3.

[0034] 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 folding and flipping rear ladder structure for a fire truck, the fire truck including a rear cargo box (1), characterized in that: The folding and flipping rear ladder structure includes a main ladder hinge frame (2), which is fixed to the upper part of the right side of the rear panel (1) of the carriage; a main ladder (3), the upper end of which is hinged to the main ladder hinge frame (2); a flipping ladder (4), the upper end of which is hinged to the lower end of the main ladder (3), and the lower end of the flipping ladder (4) flips upward to abut the right side of the main ladder (3) when not in use, and is locked or unlocked by a locking mechanism (5) provided between the main ladder (3) and the flipping ladder (4); a support frame (6) and a pair of assisting mechanisms (7), which are hinged to the upper end of the flipping ladder (4) and the right side of the rear panel (1) of the carriage in an accompanying state. When the locking mechanism (5) releases the lock between the tilting ladder (4) and the main ladder (3) and manually applies force to the lower end of the tilting ladder (4) to rotate to the limit state in the direction away from the main ladder (3), a trapezoidal space with a narrow upper part and a wide lower part is formed between the main ladder (3) together with the tilting ladder (4) and the right side of the tailboard (1) of the carriage. The support frame (6) and the pair of assisting mechanisms (7) are hinged to the upper end of the tilting ladder (4) and unfold in the direction away from the tailboard (1). When the lower end of the tilting ladder (4) is close to the right side of the main ladder (3), the main ladder (3) together with the tilting ladder (4) returns to the direction of the tailboard (1). The support frame (6) and the pair of assisting mechanisms (7) are hinged to the upper end of the tilting ladder (4) and retract in the direction of the tailboard (1).

2. The folding and flipping rear ladder structure of a fire truck according to claim 1, characterized in that: A tailgate cavity (11) is formed at the rear or front of the right side of the tailgate (1) and along the height direction of the tailgate (1). The main ladder hinge frame (2) is located in the tailgate cavity (11). In the use state, the main ladder (3) together with the tilting ladder (4) extends out of the tailgate cavity (11). In the non-use state, the main ladder (3) together with the tilting ladder (4) returns to the direction of the tailgate cavity (11). The support frame (6) and a pair of assisting mechanisms (7) are hinged to the upper end of the tilting ladder (4) and retract towards the tailgate cavity.

3. The folding and flipping rear ladder structure of a fire truck according to claim 2, characterized in that: The main ladder hinge frame (2) is located at the upper part of the rear panel cavity (11) of the carriage in the height direction. The middle part of the main ladder hinge frame (2) is fixed to the bottom wall of the rear panel cavity (11) of the carriage by a set of main ladder hinge frame fixing bolts (21). A main ladder hinge frame front arm (22) is formed on the front side of the main ladder hinge frame (2), and a main ladder hinge frame rear arm (23) is formed on the rear side of the main ladder hinge frame (2) at the position of the main ladder hinge frame front arm (22). The upper end of the main ladder (3) is hinged to the right end of the main ladder hinge frame front arm (22) and the main ladder hinge frame rear arm (23).

4. The folding and flipping rear ladder structure of a fire truck according to claim 3, characterized in that: The main ladder (3) includes a front column (31), a rear column (32), and a tread (33). The front and rear columns (31, 32) are aligned with each other in height. A front column hinge seat (311) is provided at the upper end of the front column (31). The lower part of the front column hinge seat (311) has a pair of front column hinge seat inserts that are aligned with each other. The pair of front column hinge seat inserts are inserted into the front column. (31) A pair of main ladder front column cavities (312) are fixed by main ladder front column hinge seat insert fixing screws (3111), and the upper end of the main ladder front column hinge seat (311) extends upward and is hinged to the right end of the main ladder hinge frame front arm (22) through the main ladder front column hinge pin (3112). A main ladder rear column hinge seat (321) is arranged at the upper end of the main ladder rear column (32), and the lower end of the main ladder rear column hinge seat (321) forms The main ladder rear column hinge seat has a pair of corresponding front and rear hinge feet. These feet are inserted into a pair of main ladder rear column cavities (322) of the main ladder rear column (32) and are each fixed by a main ladder rear column hinge seat fixing screw (3211). The upper end of the main ladder rear column hinge seat (321) extends upwards and is hinged to the right end of the main ladder hinge frame rear arm (23) via a main ladder rear column hinge pin (3212). The main ladder tread (3... 3) There is a set of them, and each is fixed between the front and rear columns (31, 32) of the main ladder at intervals by the main ladder step fixing screws (331). When the flip ladder (4) is not in use and is folded, its lower end flips up to abut against the right side of the front column (31) and the rear column (32) of the main ladder, and the locking mechanism (5) locks the flip ladder (4) to the front column (31) or the rear column (32) of the main ladder.

5. The folding and flipping rear ladder structure of a fire truck according to claim 4, characterized in that: The width of the flip ladder (4) is equal to the width of the main ladder (3). The flip ladder (4) includes a front column (41), a rear column (42), and a flip ladder step (43). The front and rear columns (41, 42) are aligned with each other. There is a set of flip ladder steps (43), each fixed between the front and rear columns (41, 42) at intervals by flip ladder step fixing screws (431). When the lower end of the flip plate (4) is flipped upward to a position close to the right side of the main ladder (3), the right sides of the front and rear columns (41, 42) of the flip ladder are close to the front and rear columns (31, 32) of the main ladder, respectively. The locking mechanism (5) locks the front column (41) of the flip ladder to the front column (31) of the main ladder or locks the rear column (42) of the flip ladder to the rear column (32) of the main ladder.

6. The folding and flipping rear ladder structure of a fire truck according to claim 5, characterized in that: A set of hinge seat screws (441) is fixed to the front upper end of the front column (41) and the rear upper end of the rear column (42) of the flip ladder. The left ends of the hinge seats (44) protrude from the left side of the front column (41) and the rear column (42) of the flip ladder, respectively, and are hinged to the lower ends of the front column (31) and the rear column (32) of the main ladder through the hinge shaft (442) of the hinge seat.

7. The folding and flipping rear ladder structure of a fire truck according to claim 6, characterized in that: A main ladder column lower hinge seat (34) is provided at the lower end of each of the front column (31) and the rear column (32) of the main ladder. The upper ends of each pair of main ladder column lower hinge seats (34) form a pair of main ladder column lower hinge seat pins. Each pair of main ladder column lower hinge seat pins is inserted into the front and rear column cavities (312, 322) of the main ladder and is fixed by a set of main ladder column lower hinge seat pin fixing screws (341). The lower ends of the pair of main ladder column lower hinge seats (34) protrude from the front and rear column cavities (312, 322) of the main ladder, respectively. The tilting ladder column The hinge shaft (442) of the hinge seat is hinged to the lower end of the lower hinge seat (34) of the main ladder column; wherein, a locking pin hole (443) is provided at the left end of the pair of hinge seats (44) of the rotating ladder column, and a main ladder column hinge seat pin hole is provided at the lower end of the pair of lower hinge seats (34) of the main ladder column, and at the position corresponding to the locking pin hole (443). The upper end of the rotating ladder (4) and the lower end of the main ladder (3) are locked or unlocked by inserting or withdrawing the locking pin hole (443) and the main ladder column hinge seat pin hole.

8. The folding and flipping rear ladder structure of a fire truck according to claim 5, characterized in that: A lower hinge seat (45) of a support frame is inserted and fixed at the upper end of the front column (41) and the rear column (42) of the tilting ladder (4). A pair of upper hinge seats (111) of the support frame are fixed on the bottom wall of the rear cavity of the carriage (11) and at the position corresponding to the upper left of the lower hinge seat (45) of the support frame by a fixing bolt (1111) of the upper hinge seat of the support frame. The front and rear sides of the support frame (6) facing the tilting ladder (4) are hinged to the opposite sides of the pair of lower hinge seats (45) of the support frame by a lower hinge pin (61). The front and rear sides of the support frame (6) facing the pair of upper hinge seats (111) of the support frame are hinged to the opposite sides of the pair of upper hinge seats (111) of the support frame by a hinge pin (62).

9. The folding and flipping rear ladder structure of a fire truck according to claim 8, characterized in that: Each of the pair of assist mechanisms (7) includes a gas spring cylinder (71). The right end of the gas spring cylinder cylinder (711) has a cylinder cylinder hinge joint (7111) which is hinged to the lower hinge seat (45) of the support frame. The left end of the cylinder body of the gas spring cylinder (71) has a cylinder body hinge joint (72) which is hinged to the upper hinge seat (111) of the support frame.

10. The folding and flipping rear ladder structure of a fire truck according to claim 5, characterized in that: The locking mechanism (5) includes a hook shaft seat (51), a hook (52), a hook head mounting seat (53), a hook head mounting shaft (54), and a tension spring (55). The hook shaft seat (51) is fixed to the lower front side of the main ladder front column (31) of the main ladder (3) by a pair of hook shaft seat fixing screws (511). The end of the hook (52) facing the main ladder front column (31) is pivotally mounted on the hook shaft (521), and the hook shaft (521) is fixed on the hook shaft seat (51). The end of the hook (52) facing the front column (41) of the tilting ladder (4) forms a hook head. (522) The locking hook head (522) corresponds to and is hooked with the locking hook head hook shaft (54). The locking hook head hook shaft seat (53) is fixed to the rear side of the front column (41) of the flip ladder by a pair of locking hook head hook shaft seat fixing screws (531) at the position corresponding to the locking hook shaft seat (51). The locking hook head hook shaft (54) is fixed on the locking hook head hook shaft seat (53). One end of the tension spring (55) is fixed on the locking hook head tension spring positioning ear (5221) formed on the locking hook head (522), while the other end of the tension spring (55) is fixed on the locking hook shaft seat tension spring fixing ear (512) formed on the locking hook shaft seat (51).

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