Automatic roll-over steps for fire trucks

Abstract

The utility model discloses a fire engine automatic overturning step, including frame and swing frame, swing frame one end is hinged in the frame downside, swing frame has the horizontal working position and vertical storage position in the rotation range, still include: the pedal is hinged on swing frame other end, drive component is used for driving swing frame rotation to switch between working position and storage position, linkage component is used for when swing frame rotates to working position, linkage pedal rotates horizontally, and when swing frame rotates and leaves working position, linkage pedal rotates and is perpendicular to swing frame. The utility model discloses through setting linkage component, when swing frame carries pedal and rotates to vertical storage position, through the action of linkage component, pedal also rotates and is perpendicular to swing frame at this time, then, pedal is horizontal and inlayed in the high position of frame inboard, thereby greatly avoids the occupation to frame internal lateral space.

Description

Technical Field

[0001] This utility model relates to the field of fire truck technology, specifically to an automatic tilting step for a fire truck. Background Technology

[0002] When fire trucks are in use for firefighting and rescue operations, firefighters must be able to quickly access the equipment on board to meet the requirements of rapid water deployment and firefighting. Since most fire trucks are now modified from heavy-duty chassis, the equipment in the upper compartments of the equipment boxes is relatively high off the ground. Therefore, steps are needed to access the equipment in these compartments. To facilitate firefighters' access to the equipment, flip-up steps need to be installed at the bottom of the equipment boxes, allowing firefighters to retrieve the equipment in the shortest possible time.

[0003] Patent document CN216761623U discloses a side-mounted flip-up step device for fire trucks, including a step. Hinges are connected to both rear ends of the step. The front ends of the hinges are rotatably connected to a fixed bracket via a pivot. The rear ends of the hinges are connected to a gas spring bracket via a gas spring. The gas spring bracket is fixed to the rear ends of the uprights on both sides of the equipment compartment. The fixed bracket is fixed to the front ends of the uprights on both sides of the equipment compartment. A limiting plate is provided on the fixed bracket to limit the step's movement during operation. This invention, by fixing the fixed brackets at both ends of the side-mounted flip-up step to the uprights on both sides of the equipment compartment, allows accessories on the chassis to be kept inside the flip-up step. When the flip-up step is opened, firefighters can stand on it to quickly access equipment in the compartment. When the flip-up step is closed, it also protects the accessories on the chassis. This invention has good versatility, can be installed on any chassis, and has high space utilization.

[0004] In the prior art as described in the aforementioned patent, when the steps are not in use, they flip up and become obstructed on the surface, affecting the utilization of some side space of the fire truck. Therefore, there is an urgent need for an automatic flipping step for fire trucks to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic rotating step for fire trucks to overcome the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An automatic tilting step for a fire truck includes a frame and a swing frame. One end of the swing frame is hinged to the lower side of the frame. The swing frame has a horizontal working position and a vertical storage position within its rotation range. The step also includes: a pedal hinged to the other end of the swing frame; a drive assembly for driving the swing frame to rotate to switch between the working position and the storage position; and a linkage assembly for linking the pedal to rotate horizontally when the swing frame rotates to the working position, and for linking the pedal to rotate perpendicular to the swing frame when the swing frame rotates away from the working position.

[0008] Preferably, a rotating seat is fixedly provided on the inner side wall of the frame, and a control arm is provided on the swing frame, the control arm being rotatably connected to the rotating seat.

[0009] Preferably, a positioning block is fixedly provided on the inner side wall of the frame, and a first abutment block and a second abutment block are provided on the control arm. The first abutment block abuts against the positioning block when the swing frame is in the working position, and the second abutment block abuts against the positioning block when the swing frame is in the storage position.

[0010] Preferably, the drive assembly includes a telescopic drive unit mounted on the inner side wall of the frame, and the output end of the telescopic drive unit is hinged to the control arm.

[0011] Preferably, the linkage assembly includes a curved arm hinged to the control arm, a connecting rod movably disposed on the side wall of the swing frame, the two ends of the connecting rod being hinged to the pedal and the curved arm respectively, a backing block being fixedly disposed on the curved arm, and a first backing rod and a second backing rod being fixedly disposed on the inner wall of the frame. When the swing frame is in the working position, the backing block abuts against the first backing rod, and when the swing frame is in the retracted position, the backing block abuts against the second backing rod.

[0012] Preferably, a damping rod is hinged between the control arm and the crank arm.

[0013] Preferably, the bottom surface of the pedal is elastically hinged with a hook, and the side wall of the pedal is provided with a triggering component to control the rotation of the hook. When the swing frame is in the retracted position, the triggering component is triggered to control the hook to rotate and extend downward.

[0014] Preferably, the triggering component includes a sleeve that is fitted onto the pivot of the hook, the inner wall of the sleeve is provided with a spiral groove, the pivot of the hook is provided with a sliding protrusion that is movably connected to the spiral groove, one end of the sleeve extends through and protrudes from the side wall of the pedal, and the top surface of the frame is provided with a baffle that matches the protruding end of the sleeve.

[0015] In the above technical solution, the beneficial effects of this utility model are:

[0016] The automatic flip-up step of this fire truck is equipped with a linkage component. When the swing frame carrying the step rotates to the vertical storage position, the step also rotates to be perpendicular to the swing frame at this time. As a result, the step is horizontally embedded in the high position inside the frame, which greatly avoids occupying the lateral space inside the frame and improves the practicality of the device.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0018] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram of the swing frame in the working position according to an embodiment of the present invention;

[0021] Figure 2 Provided for embodiments of the present invention Figure 1 Enlarged structural diagram at point A;

[0022] Figure 3 This is a schematic diagram of the swing frame in the storage position according to an embodiment of the present invention;

[0023] Figure 4 A side cross-sectional view of the swing frame in the storage position according to an embodiment of the present invention;

[0024] Figure 5 Provided for embodiments of the present invention Figure 4 A magnified structural diagram at point B in the middle.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Frame; 2. Swing frame; 3. Pedal; 4. Rotary seat; 5. Control arm; 6. Positioning block; 7. First contact block; 8. Second contact block; 9. Telescopic drive unit; 10. Crank arm; 11. Connecting rod; 12. Backing block; 13. First backing rod; 14. Second backing rod; 15. Damping rod; 16. Hook; 17. Sleeve; 18. Spiral groove; 19. Sliding protrusion; 20. Baffle. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0028] Please see Figure 1-5, an automatically flipping step for a fire truck provided in an embodiment of the present invention comprises a frame 1 and a swing frame 2, one end of the swing frame 2 is hinged to the lower side of the frame 1, the swing frame 2 has a horizontal working position and a vertical storage position within its rotation range, and the automatically flipping step further comprises: a pedal 3 hinged to the other end of the swing frame 2; a drive assembly configured to drive the swing frame 2 to rotate to switch between the working position and the storage position; a linkage assembly configured to link the pedal 3 to rotate to a horizontal position when the swing frame 2 rotates to the working position, and link the pedal 3 to rotate to be perpendicular to the swing frame 2 when the swing frame 2 rotates away from the working position.

[0029] Specifically, the frame 1 is a rectangular frame configured to be installed on the side of a fire truck, and an internal reserved space can be arranged in combination with other fire-fighting appliances; the swing frame 2 is in a U-shape, both ends of the swing frame are connected to the lower side portion of the frame 1, and the middle annular portion is connected to the pedal 3; the swing frame 2 overhangs outside the frame 1 in the working position, and is located inside the frame 1 in the storage position; the hinge shaft of the pedal 3 is arranged parallel to the hinge shaft of the swing frame 2, that is, the pedal 3 is connected to the swing frame 2 through hinge points arranged on two opposite sides corresponding to both ends of the swing frame 2; the drive assembly is driven by a servo system, and the linkage assembly operates passively along with the operation of the drive assembly. In actual use of the present technical solution, when the drive assembly drives the swing frame 2 to switch to the working position, the linkage assembly links the pedal 3 to rotate to a horizontal state, so that the swing frame 2 carries the horizontal pedal 3 to horizontally overhang outside the frame 1 for stepping; when the drive assembly drives the swing frame 2 to switch to the storage position, the linkage assembly links the pedal 3 to rotate to be perpendicular to the current swing frame 2, thus the pedal 3 is horizontally embedded in a high position inside the frame 1, which greatly avoids occupation of the lateral space inside the frame 1.

[0030] Compared with the prior art, the automatically flipping step for a fire truck proposed in the embodiment of the present invention, by providing the linkage assembly, when the swing frame 2 carries the pedal 3 to rotate to the vertical storage position, under the action of the linkage assembly, the pedal 3 also rotates to be perpendicular to the current swing frame 2, thus the pedal 3 is horizontally embedded in the high position inside the frame 1, which greatly avoids occupation of the lateral space inside the frame 1 and improves the practicability of the device.

[0031] As a preferred technical solution of this embodiment, a rotary seat 4 is fixedly arranged on the inner side wall of the frame 1, a control arm 5 is arranged on the swing frame 2, the control arm 5 is rotatably connected to the rotary seat 4, specifically, the middle portion of the control arm 5 is connected to the rotary seat 4, and the two ends of the control arm 5 connected to the swing frame 2 and the drive assembly are respectively located on opposite sides of the rotary seat 4.

[0032] As a preferred technical solution in this embodiment, a positioning block 6 is fixedly provided on the inner side wall of the frame 1, and a first abutment block 7 and a second abutment block 8 are provided on the control arm 5. The first abutment block 7 abuts against the positioning block 6 when the swing frame 2 is in the working position, and the second abutment block 8 abuts against the positioning block 6 when the swing frame 2 is in the storage position. Specifically, the positioning block 6 abuts against the first abutment block 7 or the second abutment block 8 to facilitate the frame 1 to accurately find the position in the working position or the storage position.

[0033] As a preferred technical solution in this embodiment, the drive assembly includes a telescopic drive unit 9 installed on the inner side wall of the frame 1. The output end of the telescopic drive unit 9 is hinged to the control arm 5. Specifically, the telescopic drive unit 9 is preferably a hydraulic cylinder. When the output end of the telescopic drive unit 9 retracts, the swing frame 2 rotates to the working position. When the output end of the telescopic drive unit 9 extends, the swing frame 2 rotates to the storage position.

[0034] As a preferred technical solution in this embodiment, the linkage assembly includes a curved arm 10 hinged to the control arm 5, a connecting rod 11 movably disposed on the side wall of the swing frame 2, with both ends of the connecting rod 11 hinged to the pedal 3 and the curved arm 10 respectively, a support block 12 fixedly disposed on the curved arm 10, and a first support rod 13 and a second support rod 14 fixedly disposed on the inner wall of the frame 1. When the swing frame 2 is in the working position, the support block 12 abuts against the first support rod 13, and when the swing frame 2 is in the retracted position, the support block 12 abuts against the second support rod 14. Specifically, the curved arm 10 is C-shaped, with one end of the curved arm 10 hinged to the control arm 5 closer to the inner side of the frame 1, and the notch of the curved arm 10 facing the rotating seat 4; the support block 12 is disposed close to the end of the curved arm 10 hinged to the control arm 5; the first support rod 13 and the second support rod 14 are both fixedly disposed perpendicular to the inner wall of the frame 1 and avoid the control arm 5. The rotation range of arm 5 is designed to avoid interference. One end of connecting rod 11 is hinged to the middle part of the crank arm 10, and the other end is hinged to pedal 3. The hinge point of connecting rod 11 is opposite to the rotation axis of pedal 3, which is on the opposite side of the swing end of pedal 3. When the abutment block 12 abuts against the first abutment rod 13, the crank arm 10 drives the connecting rod 11 to push outward of the frame 1. Then, when the corresponding swing frame 2 is in the working position, the connecting rod 11 pushes the hinge point of its hinged pedal 3 outward, thereby causing the swing end of pedal 3 to swing inward of the frame 1, thus smoothly forming a horizontal position. When the abutment block 12 abuts against the second abutment rod 14, the crank arm 10 drives the connecting rod 11 to pull downward. Then, when the corresponding swing frame 2 is in the storage position, the connecting rod 11 pulls the hinge point of its hinged pedal 3 downward, thereby causing the pedal 3 to swing upward, thus smoothly forming a horizontally embedded position inside the frame 1.

[0035] As a preferred technical solution in this embodiment, a damping rod 15 is hinged between the control arm 5 and the crank arm 10. Specifically, one end of the damping rod 15 is hinged to the end of the crank arm 10 away from the hinge point with the control arm 5. The damping rod 15 is used to keep the crank arm 10 stationary when it is not subjected to external force, thereby making the rotation of the pedal 3 smooth.

[0036] In another embodiment of this utility model, a hook 16 is elastically hinged to the bottom surface of the pedal 3, and a triggering component for controlling the rotation of the hook 16 is provided on the side wall of the pedal 3. When the swing frame 2 is in the storage position, the triggering component is triggered to control the hook 16 to rotate and extend downward. Specifically, the hook 16 provided on the bottom surface of the pedal 3 can be used to hang some fire-fighting equipment to increase space utilization. However, when the pedal 3 extends out of the frame 1, the fire-fighting equipment has been removed, and the exposed hook 16 is easily damaged or may cause injury to nearby personnel. Therefore, the triggering component is provided to control the hook 16 to extend as needed, and the elastic rotation of the hook 16 can control the hook 16 to automatically fold close to the bottom surface of the pedal 3 when not in use.

[0037] As a preferred technical solution in this embodiment, the triggering component includes a sleeve 17 sleeved to the pivot of the hook 16. The inner wall of the sleeve 17 is provided with a spiral groove 18. The pivot of the hook 16 is provided with a sliding protrusion 19 that is movably connected to the spiral groove 18. One end of the sleeve 17 extends through the side wall of the pedal 3. The inner top surface of the frame 1 is provided with a baffle 20 that matches the extended end of the sleeve 17. Specifically, the pivot of the hook 16 is perpendicular to the rotation axis of the pedal 3 and parallel to the surface of the pedal 3. A torsion spring or coil spring is connected between the pivot of the hook 16 and the inner side of the pedal 3. The elastic rotation function of the hook 16 makes it automatically maintain in a folded position that fits the bottom surface of the pedal 3. The sleeve 17 only moves axially on the pedal 3. When the swing frame 2 is in the retracted position, the extended sleeve 17 abuts against the baffle 20. In actual use, when the swing frame 2 enters the storage position, the end of the extended sleeve 17 abuts against the baffle 20, and the sleeve 17 moves axially relative to the pivot of the hook 16. This triggers the spiral drive of the spiral groove 18 and the sliding protrusion 19, causing the hook 16 to rotate 90° to extend downward for hanging items. When the swing frame 2 leaves the storage position, the sleeve 17 leaves the baffle 20, and the hook 16 rotates elastically back to the position where it is folded and fits against the bottom surface of the pedal 3.

[0038] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An automatic tilting step for a fire truck, comprising a frame (1) and a swing frame (2), one end of the swing frame (2) being hinged to the lower side of the frame (1), the swing frame (2) having a horizontal working position and a vertical storage position within its rotation range, characterized in that, Also includes: The pedal (3) is hinged to the other end of the swing frame (2); A drive assembly for driving the swing frame (2) to rotate to switch between the working position and the storage position; The linkage component is used to rotate the linkage pedal (3) horizontally when the swing frame (2) rotates to the working position, and to rotate perpendicular to the swing frame (2) when the swing frame (2) rotates away from the working position.

2. The automatic roll-over stair for a fire apparatus of claim 1, wherein, A rotating seat (4) is fixedly installed on the inner side wall of the frame (1), and a control arm (5) is installed on the swing frame (2). The control arm (5) is rotatably connected to the rotating seat (4).

3. The automatic roll-over stair for a fire apparatus of claim 2, wherein, A positioning block (6) is fixedly installed on the inner side wall of the frame (1), and a first patch (7) and a second patch (8) are installed on the control arm (5). The first patch (7) abuts against the positioning block (6) when the swing frame (2) is in the working position, and the second patch (8) abuts against the positioning block (6) when the swing frame (2) is in the storage position.

4. The automatic roll-over stair for a fire apparatus of claim 2, wherein, The drive assembly includes a telescopic drive unit (9) mounted on the inner wall of the frame (1), and the output end of the telescopic drive unit (9) is hinged to the control arm (5).

5. The automatic roll-over stair for a fire apparatus of claim 2, wherein, The linkage assembly includes a crank arm (10) hinged on the control arm (5), a connecting rod (11) movably arranged on the side wall of the swing frame (2), the two ends of the connecting rod (11) being hinged to the pedal (3) and the crank arm (10) respectively, a backing block (12) fixedly arranged on the crank arm (10), and a first backing rod (13) and a second backing rod (14) fixedly arranged on the inner wall of the frame (1). When the swing frame (2) is in the working position, the backing block (12) abuts against the first backing rod (13), and when the swing frame (2) is in the storage position, the backing block (12) abuts against the second backing rod (14).

6. The automatic roll-over stair for a fire apparatus of claim 5, wherein, A damping rod (15) is hinged between the control arm (5) and the crank arm (10).

7. The automatic tilting step of the fire truck according to claim 1, characterized in that, The bottom surface of the pedal (3) is elastically hinged with a hook (16), and the side wall of the pedal (3) is provided with a trigger component to control the rotation of the hook (16). When the swing frame (2) is in the storage position, the trigger component is triggered to control the hook (16) to rotate and extend downward.

8. The automatic roll-over stair for a fire apparatus of claim 7, wherein, The triggering component includes a sleeve (17) sleeved to the pivot of the hook (16). The inner wall of the sleeve (17) is provided with a spiral groove (18). The pivot of the hook (16) is provided with a sliding protrusion (19) that is movably connected to the spiral groove (18). One end of the sleeve (17) extends through the side wall of the extended pedal (3). The inner top surface of the frame (1) is provided with a baffle (20) that matches the extended end of the sleeve (17).

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