A telescopic step device for a vehicle and a fire vehicle thereof

Abstract

The utility model provides a kind of telescopic step ladder device for vehicle and fire vehicle thereof, the telescopic step ladder device for vehicle includes mounting plate, first hinged seat, second hinged seat, third hinged seat, first pedal, second pedal, electric cylinder and folding linkage rod group;The first pedal and second pedal are fixedly connected on folding linkage rod group, and folding linkage rod group is hinged in the hinged opening of first hinged seat and second hinged seat;The tail end of electric cylinder is hinged in the hinged opening of third hinged seat, and the output end of electric cylinder is connected with folding linkage rod group.The utility model's overall space is smaller, can be well hidden below vehicle chassis, its power transmission is simple and direct, there is the advantage of opening fast, low failure rate, high adjustability.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted devices, specifically to a telescopic staircase device for vehicles. Background Technology

[0002] For large fire trucks, the driver's cab and rear seats are usually quite high off the ground, and the vehicle's onboard steps are typically high and only have one step, making it inconvenient for personnel to get on and off, and easily leading to falls or ankle sprains. Although some folding retractable ladders exist in the existing technology, these ladders have many components, require a lot of space, and generally suffer from slow opening speed, high failure rate, and poor height adjustability, which can easily affect the efficiency of fire response. Utility Model Content

[0003] In view of this, it is necessary to provide a telescopic step ladder device for vehicles that addresses the problems existing in the prior art, and has the advantages of simple structure, quick opening and closing and adjustable height.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A telescopic step ladder device for a vehicle, installed under the vehicle chassis, includes a mounting plate, a first hinge seat, a second hinge seat, a third hinge seat, a first pedal, a second pedal, an electric cylinder, and a folding linkage assembly. The hinge openings of the first, second, and third hinge seats face downwards. The upper ends of the first, second, and third hinge seats are provided with integrally formed fixing studs. The fixing bolts at the upper ends of the first, second, and third hinge seats pass through the mounting plate from bottom to top and are respectively fixedly connected to the underside of the vehicle chassis. The first and second hinge seats are arranged opposite to each other, and the third hinge seat is arranged on the perpendicular bisector of the line connecting the first and second hinge seats. The first pedal and the second pedal are fixedly connected to the folding linkage group, which is hinged to the hinge opening of the first hinge seat and the second hinge seat; the tail end of the electric cylinder is hinged to the hinge opening of the third hinge seat, and the output end of the electric cylinder is connected to the folding linkage group to drive the folding linkage group to fold or unfold.

[0005] Furthermore, the folding linkage assembly includes a linkage shaft, a first straight rod, a second straight rod, a third straight rod, a fourth straight rod, a first pedal fixing rod, a second pedal fixing rod, a third pedal fixing rod, and a fourth pedal fixing rod; Each pedal fixing rod includes an integrally formed pedal fixing part and a linkage connecting part. One end of the pedal fixing part and the linkage connecting part intersects at an obtuse angle, and the other end extends outward along a straight line. The first pedal fixing rod and the second pedal fixing rod are arranged parallel to each other. The first pedal is fixedly connected between the pedal fixing parts of the first and second pedal fixing rods. The two ends of the linkage shaft are fixedly connected to the ends of the linkage connecting parts of the first and second pedal fixing rods, respectively. The third and fourth pedal fixing rods are arranged parallel to each other, and the second pedal is fixedly connected between the pedal fixing parts of the third and fourth pedal fixing rods. The first straight rod and the second straight rod are arranged parallel to each other; the corner of the first pedal fixing rod is hinged to the middle of the first straight rod, and the corner of the second pedal fixing rod is hinged to the middle of the second straight rod; one end of the first straight rod is hinged to the first hinge seat, and the other end is hinged to the end of the linkage connection part of the third pedal fixing rod; one end of the second straight rod is hinged to the second hinge seat, and the other end is hinged to the end of the linkage connection part of the fourth pedal fixing rod. One end of the third straight rod is hinged to the pedal fixing part of the first pedal fixing rod, and the other end is hinged to the linkage connection part of the third pedal fixing rod; one end of the fourth straight rod is hinged to the pedal fixing part of the second pedal fixing rod, and the other end is hinged to the linkage connection part of the fourth pedal fixing rod. The output end of the electric cylinder is connected to the linkage shaft, which is used to control the folding linkage group to fold or unfold by pushing the linkage shaft. When the folding linkage group is in the folded state, the first pedal and the second pedal are both stored under the mounting plate. When the folding linkage group is in the unfolded state, the first pedal and the second pedal extend outward from under the mounting plate.

[0006] Furthermore, the lengths of the first and second straight rods are greater than the lengths of the third and fourth straight rods.

[0007] Furthermore, a spherical bearing is fixedly connected to the output end of the electric cylinder, and the spherical bearing is rotatably connected to the middle of the linkage shaft.

[0008] Furthermore, the first and second hinge seats are provided with arc-shaped limiting grooves, and the sides of the first and second straight rods are provided with limiting posts that match the limiting grooves. The limiting posts of the first and second straight rods are respectively limited and connected in the limiting grooves of the first and second hinge seats to limit the movement stroke of the first and second straight rods.

[0009] A fire truck includes the telescopic ladder device for the vehicle described above, wherein the telescopic ladder device is installed under the chassis at the door of the fire truck via fixing studs at the upper ends of a first hinge seat, a second hinge seat, and a third hinge seat.

[0010] Furthermore, the fire truck is equipped with a door opening sensor at its door to detect the door's open / closed status. The door opening sensor is connected to the electric cylinder of the telescopic ladder device via a control circuit.

[0011] This utility model provides a telescopic ladder device for vehicles and its fire truck, achieving a foldable vehicle-mounted ladder structure with fewer components and a simpler structure. This utility model requires only one electric cylinder to drive the extension and folding of the ladder structure, resulting in a simple power configuration. Furthermore, the folding linkage assembly in this utility model, through its scientifically designed structure, can better transmit the driving force of the electric cylinder, smoothly completing the unfolding and retraction of the first and second steps. This utility model occupies a small overall space and can be well concealed under the vehicle chassis. Its power transmission is simple and direct, offering advantages such as fast opening speed, low failure rate, and high adjustability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a telescopic step ladder device for a vehicle in the deployed state, provided by an embodiment of this utility model.

[0013] Figure 2 This is a schematic diagram of a telescopic step ladder device for vehicles in a folded state, provided by an embodiment of this utility model.

[0014] Figure 3 This is an exploded view of a telescopic staircase device for vehicles provided in an embodiment of this utility model.

[0015] Figure 4 This is a structural schematic diagram of a fire truck provided in an embodiment of the present utility model. Detailed Implementation

[0016] The technical solution of this utility model will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0017] like Figures 1 to 3 As shown in the figure, this utility model provides a telescopic step device for vehicles, which is installed under the vehicle chassis at the vehicle door. The telescopic step device for vehicles includes a mounting plate 1, a first hinge seat 11, a second hinge seat 12, a third hinge seat 13, a first pedal 41, a second pedal 42, an electric cylinder 2, and a folding linkage rod assembly 3; The hinge openings of the first hinge seat 11, the second hinge seat 12, and the third hinge seat 13 face downwards. The upper ends of the first hinge seat 11, the second hinge seat 12, and the third hinge seat 13 are provided with integrally formed fixing studs. The fixing bolts at the upper ends of the first hinge seat 11, the second hinge seat 12, and the third hinge seat 13 pass through the mounting plate 1 from bottom to top and are respectively fixedly connected to the underside of the vehicle chassis. The first hinge seat 11 and the second hinge seat 12 are arranged opposite each other, and the third hinge seat 13 is located on the perpendicular bisector of the line connecting the first hinge seat 11 and the second hinge seat 12. By adjusting the connection depth between the fixing bolts at the upper ends of the first hinge seat 11, the second hinge seat 12, and the third hinge seat 13 and the vehicle chassis, the overall height of the telescopic step ladder device on the vehicle can be adjusted to accommodate different height requirements.

[0018] The first pedal 41 and the second pedal 42 are fixedly connected to the folding linkage group 3, which is hinged to the hinge opening of the first hinge seat 11 and the second hinge seat 12. The tail end of the electric cylinder 2 is hinged to the hinge opening of the third hinge seat 13, and the output end of the electric cylinder 2 is connected to the folding linkage group 3 to drive the folding linkage group 3 to fold or unfold.

[0019] Combination Figure 3 As shown, the folding linkage rod group 3 includes a linkage shaft 33, a first straight rod 311, a second straight rod 312, a third straight rod 313, a fourth straight rod 313, a first pedal fixing rod 321, a second pedal fixing rod 322, a third pedal fixing rod 323, and a fourth pedal fixing rod 324. Each pedal fixing rod includes an integrally formed pedal fixing part and a linkage connecting part. One end of the pedal fixing part and the linkage connecting part intersects at an obtuse angle, and the other end extends outward along a straight line. The first pedal fixing rod 321 and the second pedal fixing rod 322 are arranged parallel to each other. The first pedal 41 is fixedly connected between the pedal fixing parts of the first pedal fixing rod 321 and the second pedal fixing rod 322. The two ends of the linkage shaft 33 are fixedly connected to the ends of the linkage connecting parts of the first pedal fixing rod 321 and the second pedal fixing rod 322, respectively. The third pedal fixing rod 323 and the fourth pedal fixing rod 324 are arranged parallel to each other. The second pedal 42 is fixedly connected between the pedal fixing parts of the third pedal fixing rod 323 and the fourth pedal fixing rod 324. The first straight rod 311 and the second straight rod 312 are arranged in parallel opposite directions; the corner of the first pedal fixing rod 321 is hinged to the middle of the first straight rod 311, and the corner of the second pedal fixing rod 322 is hinged to the middle of the second straight rod 312; one end of the first straight rod 311 is hinged to the first hinge seat 11, and the other end is hinged to the end of the linkage connection part of the third pedal fixing rod 323; one end of the second straight rod 312 is hinged to the second hinge seat 12, and the other end is hinged to the end of the linkage connection part of the fourth pedal fixing rod 324; One end of the third straight rod 313 is hinged to the pedal fixing part of the first pedal fixing rod 321, and the other end is hinged to the linkage connection part of the third pedal fixing rod 323; one end of the fourth straight rod 314 is hinged to the pedal fixing part of the second pedal fixing rod 322, and the other end is hinged to the linkage connection part of the fourth pedal fixing rod 324. The output end of the electric cylinder 2 is connected to the linkage shaft 33, and is used to control the folding linkage rod group 3 to fold or unfold by pushing the linkage shaft 33. When the folding linkage rod group 3 is in the folded state, the first pedal 41 and the second pedal 42 are both stored under the mounting plate. When the folding linkage rod group 3 is in the unfolded state, the first pedal 41 and the second pedal 42 extend outward from under the mounting plate.

[0020] Furthermore, the lengths of the first straight rod 311 and the second straight rod 312 are greater than the lengths of the third straight rod 313 and the fourth straight rod 314.

[0021] Furthermore, the output end of the electric cylinder 2 is fixedly connected to a spherical bearing 21, and the spherical bearing 21 is rotatably connected to the middle part of the linkage shaft 33.

[0022] As an improvement, the first hinge seat 11 and the second hinge seat 12 are provided with arc-shaped limiting grooves, and the sides of the first straight rod 311 and the second straight rod 312 are provided with limiting posts that match the limiting grooves. The limiting posts of the first straight rod 311 and the second straight rod 312 are respectively limited and connected in the limiting grooves of the first hinge seat 11 and the second hinge seat 12 to limit the movement stroke of the first straight rod 311 and the second straight rod 312.

[0023] like Figure 4 As shown, this utility model embodiment also provides a fire truck, which includes the telescopic ladder device for vehicles described above; the telescopic ladder device for vehicles is installed on the chassis below the door of the fire truck through fixing studs at the upper ends of the first hinge seat 11, the second hinge seat 12 and the third hinge seat 13.

[0024] Furthermore, the fire truck is equipped with a door opening sensor at its door to detect the door's open / closed status. The door opening sensor is connected to the electric cylinder of the telescopic ladder device via a control circuit.

[0025] When the car door is opened, the door opening sensor detects the door opening and sends a sensing signal to the control circuit. The control circuit then sends an extension control signal to the electric cylinder 2, causing the output end of the electric cylinder 2 to extend outwards. This pushes the linkage shaft 33 to unfold the folding linkage assembly 3. The first pedal 41 and the second pedal 42 also unfold simultaneously for the driver to exit the vehicle. When the car door is closed, the door opening sensor detects the door closing and sends a sensing signal to the control circuit. The control circuit then sends a shortening control signal to the electric cylinder 2, causing the output end of the electric cylinder 2 to retract inwards. This pulls the linkage shaft 33 to fold the folding linkage assembly 3. The first pedal 41 and the second pedal 42 also fold and retract simultaneously to below the mounting plate 1.

[0026] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A telescopic step ladder device for a vehicle, installed under the vehicle chassis, characterized in that, It includes a mounting plate, a first hinge seat, a second hinge seat, a third hinge seat, a first pedal, a second pedal, an electric cylinder, and a folding linkage assembly; The hinge openings of the first, second, and third hinge seats face downwards. The upper ends of the first, second, and third hinge seats are provided with integrally formed fixing studs. The fixing bolts at the upper ends of the first, second, and third hinge seats pass through the mounting plate from bottom to top and are respectively fixedly connected to the underside of the vehicle chassis. The first and second hinge seats are arranged opposite to each other, and the third hinge seat is arranged on the vertical line of the line connecting the first and second hinge seats. The first pedal and the second pedal are fixedly connected to the folding linkage group, which is hinged to the hinge opening of the first hinge seat and the second hinge seat; the tail end of the electric cylinder is hinged to the hinge opening of the third hinge seat, and the output end of the electric cylinder is connected to the folding linkage group to drive the folding linkage group to fold or unfold.

2. The telescopic staircase device for vehicles according to claim 1, characterized in that, The folding linkage rod assembly includes a linkage shaft, a first straight rod, a second straight rod, a third straight rod, a fourth straight rod, a first pedal fixing rod, a second pedal fixing rod, a third pedal fixing rod, and a fourth pedal fixing rod; Each pedal fixing rod includes an integrally formed pedal fixing part and a linkage connecting part. One end of the pedal fixing part and the linkage connecting part intersects at an obtuse angle, and the other end extends outward along a straight line. The first pedal fixing rod and the second pedal fixing rod are arranged parallel to each other. The first pedal is fixedly connected between the pedal fixing parts of the first and second pedal fixing rods. The two ends of the linkage shaft are fixedly connected to the ends of the linkage connecting parts of the first and second pedal fixing rods, respectively. The third and fourth pedal fixing rods are arranged parallel to each other, and the second pedal is fixedly connected between the pedal fixing parts of the third and fourth pedal fixing rods. The first straight rod and the second straight rod are arranged parallel to each other; the corner of the first pedal fixing rod is hinged to the middle of the first straight rod, and the corner of the second pedal fixing rod is hinged to the middle of the second straight rod; one end of the first straight rod is hinged to the first hinge seat, and the other end is hinged to the end of the linkage connection part of the third pedal fixing rod; one end of the second straight rod is hinged to the second hinge seat, and the other end is hinged to the end of the linkage connection part of the fourth pedal fixing rod. One end of the third straight rod is hinged to the pedal fixing part of the first pedal fixing rod, and the other end is hinged to the linkage connection part of the third pedal fixing rod; one end of the fourth straight rod is hinged to the pedal fixing part of the second pedal fixing rod, and the other end is hinged to the linkage connection part of the fourth pedal fixing rod. The output end of the electric cylinder is connected to the linkage shaft, which is used to control the folding linkage group to fold or unfold by pushing the linkage shaft. When the folding linkage group is in the folded state, the first pedal and the second pedal are both stored under the mounting plate. When the folding linkage group is in the unfolded state, the first pedal and the second pedal extend outward from under the mounting plate.

3. The telescopic staircase device for vehicles according to claim 2, characterized in that, The lengths of the first and second straight rods are greater than the lengths of the third and fourth straight rods.

4. The telescopic staircase device for vehicles according to claim 2, characterized in that, The output end of the electric cylinder is fixedly connected to a spherical bearing, which is rotatably connected to the middle of the linkage shaft.

5. The telescopic staircase device for vehicles according to claim 2, characterized in that, The first and second hinge seats are provided with arc-shaped limiting grooves. The sides of the first and second straight rods are provided with limiting posts that match the limiting grooves. The limiting posts of the first and second straight rods are respectively limited and connected in the limiting grooves of the first and second hinge seats to limit the movement stroke of the first and second straight rods.

6. A fire truck, characterized in that, The device includes a telescopic ladder for a vehicle as described in any one of claims 1 to 5, wherein the telescopic ladder is mounted on the chassis below the door of a fire truck via fixing studs at the upper ends of a first hinge seat, a second hinge seat, and a third hinge seat.

7. The fire truck according to claim 6, characterized in that, The fire truck is equipped with a door opening sensor at its door to detect the door's open / closed status. The door opening sensor is connected to the electric cylinder of the telescopic ladder device via a control circuit.

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