A ladder device for heavy-duty trucks

Abstract

This invention relates to the field of heavy-duty truck parts technology, and in particular to a step ladder device for heavy-duty trucks. It includes a mounting frame and a folding ladder. The mounting frame is fixed to the bottom of the truck's rear end. A slider is slidably connected to the mounting frame, and the slider is rotatably connected to the folding ladder. An electric push rod is mounted on the mounting frame, and the telescopic end of the electric push rod is fixedly connected to the slider. A door panel is hinged to the end of the mounting frame away from the electric push rod. A rubber pad is provided on the inner side wall of the door panel, and a rubber sleeve is provided on the end of the folding ladder near the door panel. This invention uses a mounting frame to stably install the folding ladder at the rear of the truck. The electric push rod drives the slider to slide, realizing the extension and retraction of the folding ladder. The door panel closes the ladder, preventing collisions with obstacles during driving. The rubber sleeve and rubber pad provide cushioning and anti-slip properties, reducing hard impacts and wear. The electric push rod-driven extension and retraction of the folding ladder solves the problems of cumbersome, time-consuming, and labor-intensive operation of existing manual step ladders.

Description

Technical Field

[0001] This invention relates to the field of heavy-duty truck parts technology, and in particular to a step device for heavy-duty trucks. Background Technology

[0002] Heavy-duty trucks, as core equipment in freight and engineering transportation, typically require steps at the rear to facilitate loading, unloading, and equipment maintenance. Currently, most heavy-duty truck steps are either fixed or manually folding, which have several drawbacks: fixed steps occupy a large space and are easily damaged by road debris during transport; manually folding steps require manual operation to unfold and fold, which is cumbersome, and the weight of heavy-duty truck steps makes manual operation time-consuming, labor-intensive, and poses safety hazards.

[0003] At the same time, the existing step devices lack an effective protective structure. When the step is in the retracted state, it is prone to hard collisions with the truck body or other parts, which can cause the step to deform and wear, shortening its service life.

[0004] Therefore, there is an urgent need for a convenient and structurally robust step ladder device for heavy-duty trucks to solve the problems existing in the above-mentioned technologies. Summary of the Invention

[0005] The purpose of this invention is to provide a step ladder device for heavy-duty trucks, which solves the technical problems of existing heavy-duty truck step ladders being cumbersome to operate, structurally unstable, easily damaged by collisions, and inconvenient to use. The invention achieves automatic extension and retraction of the step ladder, improves protective performance and safety, and extends the service life of the device.

[0006] This invention provides a step ladder device for heavy-duty trucks, including a mounting frame and a folding ladder. The mounting frame is fixed to the bottom of the rear of the truck, and a slider is slidably connected to the mounting frame. The slider is rotatably connected to the folding ladder. An electric push rod is provided on the mounting frame, and the telescopic end of the electric push rod is fixedly connected to the slider. A door panel is hinged to the end of the mounting frame away from the electric push rod. A rubber pad is provided on the inner side wall of the door panel, and a rubber sleeve is provided at the end of the folding ladder near the door panel.

[0007] Furthermore, the mounting bracket is U-shaped, and two opposite side walls of the mounting bracket are respectively provided with sliding grooves, and the two ends of the slider slide along the two sliding grooves respectively; each sliding groove is provided with an electric push rod.

[0008] Furthermore, the mounting bracket has an upper connecting plate at the top and a lower connecting plate at the bottom of one end near the door panel, the bottom of the door panel is hinged to the lower connecting plate, and the top of the door panel is connected to the upper connecting plate by a lock.

[0009] Furthermore, the folding ladder includes two side supports and multiple steps disposed between the two side supports. Each side support includes an upper rod and a lower rod that are parallel to each other. Both ends of the steps are rotatably connected to the upper rod and the lower rod of each side support, respectively. The ends of the upper rod and the lower rod of each side support are rotatably connected to the slider through a pivot.

[0010] Furthermore, a fixing block is provided on the side wall of the slider away from the electric push rod. The upper rod and the lower rod are rotatably connected to the fixing block. A pin and a first insertion hole are provided on the side wall of the lower rod. A second insertion hole is provided on the fixing block. The pin passes through the first insertion hole and is inserted into the second insertion hole.

[0011] Furthermore, the pin includes a U-shaped seat and an L-shaped pin. The two opposite side walls of the U-shaped seat are provided with through holes. The horizontal section of the L-shaped pin passes through the two through holes in sequence. A spring is sleeved on the horizontal section of the L-shaped pin. The spring is located inside the U-shaped seat. Two limiting rods are symmetrically provided on the section of the L-shaped pin inside the U-shaped seat. The two ends of the spring abut against the limiting rod and one of the side walls of the U-shaped seat, respectively. Two limiting posts are symmetrically fixed on the bottom wall of the U-shaped seat.

[0012] Furthermore, the upper surface of the pedal is provided with anti-slip protrusions, which are distributed in a diamond-shaped array.

[0013] Furthermore, the outer surface of the pedal is provided with an antifreeze coating; the rear of the pedal is provided with an anti-slip wing, the angle between the anti-slip wing and the pedal is 160°~170°; the anti-slip wing is made of elastic rubber.

[0014] Furthermore, the pedal is equipped with an electric heating component inside, and a power supply box connected to the electric heating component is embedded in the side wall of the pedal. A heating switch is provided on the outer side wall of the power supply box.

[0015] Furthermore, the mounting bracket has wing plates on its two opposite side walls, and the wing plates and the mounting bracket each have multiple threaded holes.

[0016] In summary, compared with the prior art, the present invention has the following advantages: The technical solution provided by this invention uses a mounting frame to stably install a folding ladder at the rear of a truck. An electric push rod drives a slider to slide, enabling the folding ladder to extend and retract. When not in use, the folding ladder can be stored inside the mounting frame and closed with a door panel, taking up little space and avoiding collisions with obstacles during driving. The rubber sleeves on the folding ladder and the rubber pads on the door panel provide cushioning and anti-slip effects, reducing hard impacts and wear.

[0017] The technical solution of this invention uses an electric push rod to drive a slider to slide along the mounting bracket, thereby driving the extension and retraction of the folding ladder. This solves the problems of cumbersome, time-consuming and labor-intensive operation of existing manual ladders. It is especially suitable for scenarios where the ladders of heavy trucks are heavy, improving operating efficiency and safety. The overall structure is reasonably designed, impact-resistant, and extends the service life of the device. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the ladder device in an embodiment of the present invention; Figure 2 This is a schematic diagram of the mounting bracket in an embodiment of the present invention; Figure 3 This is a schematic diagram of the pin structure in an embodiment of the present invention; Figure 4 This is a schematic diagram of the pedal structure in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1-Mounting bracket; 101-Slide groove; 102-Upper connecting plate; 103-Lower connecting plate; 2-Folding ladder; 201-Upper rod; 202-Lower rod; 2021-First insertion hole; 203-Step; 2031-Anti-slip protrusion; 2032-Anti-slip tail wing; 2033-Power supply box; 2034-Heating switch; 204-Rotating shaft; 3-Slider; 301-Fixing block; 3011-Second insertion hole; 4-Electric push rod; 5-Door panel; 501-Rubber pad; 6-Rubber sleeve; 7-Lock; 8-Pin; 801-U-shaped seat; 8011-Through hole; 8012-Limiting post; 802-L-shaped pin; 8021-Limiting rod; 803-Spring; 9-Wing plate; 10-Threaded hole. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] Example A ladder device for heavy-duty trucks, such as Figure 1 As shown, it includes mounting bracket 1 and folding ladder 2, the details of which are as follows: Mounting bracket 1 is U-shaped and fixed to the bottom of the truck's rear. Two opposite side walls of mounting bracket 1 are provided with sliding grooves 101, each containing a slider 3. The two ends of the slider 3 extend into the two sliding grooves 101 to ensure smooth sliding. Each sliding groove 101 contains an electric push rod 4. The fixed end of the electric push rod 4 is fixedly connected to the inner side wall of mounting bracket 1, and the telescopic end of the electric push rod 4 is fixedly connected to the slider 3. The two electric push rods 4 work synchronously, driving the slider 3 to slide back and forth along the sliding groove 101. The end of the sliding groove 101 near the door panel 5 is an open end, communicating with the outside.

[0025] like Figure 2As shown, a door panel 5 is hinged to the end of the mounting bracket 1 away from the electric push rod 4. An upper connecting plate 102 is located at the top of the end of the mounting bracket 1 closest to the door panel 5, and a lower connecting plate 103 is located at the bottom. The bottom of the door panel 5 is hinged to the lower connecting plate 103, and the top of the door panel 5 is connected to the upper connecting plate 102 via a lock. The lock includes latches 7 on the door panel 5 and the upper connecting plate 102. When the door panel 5 is closed, the two latches align and lock. A rubber pad 501, 5-8mm thick, is affixed to the inner wall of the door panel 5, serving as a buffer and seal to prevent hard collisions between the folding ladder 2 and the door panel 5 during vehicle operation.

[0026] The folding ladder 2 includes two side supports and multiple steps 203 disposed between the two side supports. Each side support includes an upper rod 201 and a lower rod 202 that are parallel to each other. The two ends of the steps 203 are rotatably connected to the upper rod 201 and the lower rod 202 of each side support through pins, so that the steps 203 can rotate around the pins to realize the folding of the folding ladder.

[0027] The ends of the upper rod 201 and lower rod 202 of each side bracket are rotatably connected to the slider 3 via a rotating shaft 204. Two fixing blocks 301 are welded on the side wall of the slider 3 away from the electric push rod 4. The upper rod 201 and lower rod 202 of each side bracket are rotatably connected to the corresponding fixing block 301 via a rotating shaft 204 to enhance the connection stability.

[0028] The lower rod 202 has a pin 8 and a first insertion hole 2021 on its side wall. The fixing block 301 has a second insertion hole 3011 corresponding to the first insertion hole 2021. The second insertion hole 3011 is located directly below the rotating shaft 204 connected to the upper rod 201. The pin 8 passes through the first insertion hole 2021 and is inserted into the second insertion hole 3011 to lock the lower rod 202 and the fixing block 301.

[0029] like Figure 3As shown, the pin 8 includes a U-shaped seat 801, an L-shaped pin 802, and a spring 803. One side wall of the U-shaped seat 801 is welded to the side wall of the lower rod 202. Both opposite side walls of the U-shaped seat 801 have through holes 8011. The horizontal section of the L-shaped pin 802 passes through the two through holes 8011 in sequence. Two limiting rods 8021 are symmetrically welded to a section of the L-shaped pin 802 inside the U-shaped seat 801. The horizontal section of the L-shaped pin 802 is fitted with a spring 803, which is located inside the U-shaped seat 801. Two springs 803 are symmetrically welded to the middle of the bottom wall of the U-shaped seat 801. The two ends of the limiting post 8012 and the spring 803 respectively abut against one side wall of the limiting rod 8021 and the U-shaped seat 801 to achieve automatic locking of the L-shaped pin 802. When the folding ladder is unfolded for use, the pin 8 needs to be pulled out and the L-shaped pin 802 needs to be rotated to the left or right. At the same time, it moves along the axis of the horizontal section of the L-shaped pin 802 to separate it from the first insertion hole 2021 and the second insertion hole 3011. When it moves to the side where the limiting post 8012 is away from the limiting rod 8021, the L-shaped pin 802 is rotated again to make the limiting rod 8021 abut against the limiting post 8012.

[0030] The diameter of the L-shaped pin 802 is smaller than the diameter of the through hole 8011 to ensure smooth sliding; the straight distance between the ends of the two limiting rods 8021 is greater than the diameter of the through hole 8011; the two limiting posts 8012 are located on both sides of the L-shaped pin 802, and the distance between the two limiting posts 8012 is less than the straight distance between the ends of the two limiting rods 8021.

[0031] like Figure 4 As shown, the upper surface of the pedal 203 is provided with anti-slip protrusions 2031 arranged in a diamond array; the outer surface of the pedal 203 is coated with an antifreeze coating, which adopts existing low-temperature antifreeze paint and can prevent freezing in low-temperature environments; an anti-slip tail wing 2032 is fixed at the rear of the pedal 203, the angle between the anti-slip tail wing 2032 and the pedal 203 is 165°, and the material is elastic rubber; an electric heating component is embedded inside the pedal 203, which adopts an existing heating wire structure; a power supply box 2033 connected to the electric heating component is embedded in the side wall of the pedal 203, the power supply box 2033 contains a battery, and a heating switch 2034 is provided on the outer wall of the power supply box 2033 to control the start and stop of the electric heating component.

[0032] Rubber sleeves 6 are fitted on the ends of the upper rod 201 and lower rod 202 of the folding ladder 2 away from the slider 3 to prevent slipping and provide cushioning.

[0033] Wing plates 9 are welded to the two opposite side walls of the mounting bracket 1. Multiple threaded holes 10 are provided on the wing plates 9 and the mounting bracket 1 respectively. The mounting bracket 1 is fixed to the bottom of the truck rear by bolts passing through the threaded holes 10.

[0034] The working principle of the ladder device provided in this embodiment is as follows: In use, unlock the door with the key, turn the door panel 5 downwards to open it, activate the electric push rod 4, the electric push rod 4 drives the slider 3 to slide along the slide groove 101 away from the electric push rod 4, the slider 3 drives the folding ladder 2 to extend out of the mounting bracket 1; pull the L-shaped pin 802 to separate the horizontal section of the L-shaped pin 802 from the second insertion hole 3011 and the first insertion hole 2021, then rotate the folding ladder 2 and adjust it to a suitable unfolding angle, then step on the footplate 203 to get on and off the truck; when the ambient temperature is low, press the heating switch 203. 4. The electric heating component operates to heat the footplate 203 to prevent freezing. After use, pull the L-shaped pin 802 and rotate it so that the two limit rods 8021 rotate between the two limit posts 8012. Through the elastic force of the spring 803, the end of the L-shaped pin 802 passes through the first insertion hole 2021 and is inserted into the second insertion hole 3011. Then rotate the folding ladder 2 to make it flush with the slide 101, start the electric push rod 4, drive the slider 3 to move the folding ladder 2 back into the mounting frame 1, close the door panel 5 and lock it.

[0035] The ladder device provided by the present invention has the following advantages: 1. Foldable and telescopic: The slide block is driven by an electric push rod, which, together with the rotation of the folding ladder, enables the folding ladder to extend and retract. When not in use, the folding ladder can be stored inside the mounting frame and closed with a door panel, taking up little space, avoiding collisions with obstacles during driving, and improving the truck's passability.

[0036] 2. Easy to operate: The electric push rod drives automatic extension and retraction, eliminating the need for manual pulling and saving manpower.

[0037] 3. High safety: The rubber pads and rubber sleeves provide cushioning and anti-slip protection; the anti-slip protrusions and anti-slip tail wings on the steps further enhance the anti-slip effect; the design of the antifreeze coating and electric heating components can effectively cope with low temperature and rain and snow environments, prevent the steps from freezing and slipping, and avoid accidents caused by users falling; the pin structure can increase the folding stability of the folding ladder and prevent the pin from accidentally coming off due to vehicle movement.

[0038] IV. Stable Structure: The U-shaped mounting bracket, wing plates, and threaded holes ensure that the device is securely installed; the overall structural design is reasonable, corrosion-resistant, and impact-resistant, extending the service life of the device.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A step device for heavy-duty trucks, characterized in that, The system includes a mounting frame (1) and a folding ladder (2). The mounting frame (1) is fixed to the bottom of the rear of the truck. A slider (3) is slidably connected to the mounting frame (1). The slider (3) is rotatably connected to the folding ladder (2). An electric push rod (4) is provided on the mounting frame (1). The telescopic end of the electric push rod (4) is fixedly connected to the slider (3). A door panel (5) is hinged to one end of the mounting frame (1) away from the electric push rod (4). A rubber pad (501) is provided on the inner side wall of the door panel (5). A rubber sleeve (6) is provided on one end of the folding ladder (2) near the door panel (5).

2. The ladder device according to claim 1, characterized in that, The mounting bracket (1) is U-shaped, and the two opposite side walls of the mounting bracket (1) are respectively provided with sliding grooves (101). The two ends of the slider (3) slide along the two sliding grooves (101) respectively; each sliding groove (101) is provided with an electric push rod (4).

3. The ladder device according to claim 1, characterized in that, The mounting bracket (1) has an upper connecting plate (102) at the top and a lower connecting plate (103) at the bottom of one end near the door panel (5). The bottom of the door panel (5) is hinged to the lower connecting plate (103), and the top of the door panel (5) is connected to the upper connecting plate (102) by a lock.

4. The ladder device according to claim 1, characterized in that, The folding ladder (2) includes two side supports and multiple steps (203) disposed between the two side supports. Each side support includes an upper rod (201) and a lower rod (202) that are parallel to each other. The two ends of the steps (203) are rotatably connected to the upper rod (201) and the lower rod (202) of each side support, respectively. The ends of the upper rod (201) and the lower rod (202) of each side support are rotatably connected to the slider (3) through a pivot (204).

5. The ladder device according to claim 4, characterized in that, The slider (3) has a fixing block (301) on its side wall away from the electric push rod (4). The upper rod (201) and the lower rod (202) are rotatably connected to the fixing block (301). The lower rod (202) has a pin (8) and a first insertion hole (2021) on its side wall. The fixing block (301) has a second insertion hole (3011). The pin (8) passes through the first insertion hole (2021) and is inserted into the second insertion hole (3011).

6. The ladder device according to claim 5, characterized in that, The pin (8) includes a U-shaped seat (801) and an L-shaped pin (802). The two opposite side walls of the U-shaped seat (801) are provided with through holes (8011). The horizontal section of the L-shaped pin (802) passes through the two through holes (8011) in sequence. A spring (803) is sleeved on the horizontal section of the L-shaped pin (802). The spring (803) is located inside the U-shaped seat (801). Two limiting rods (8021) are symmetrically provided on a section of the L-shaped pin (802) inside the U-shaped seat (801). The two ends of the spring (803) abut against the limiting rod (8021) and one of the side walls of the U-shaped seat (801), respectively. Two limiting posts (8012) are symmetrically fixed on the bottom wall of the U-shaped seat (801).

7. The ladder device according to claim 4, characterized in that, The upper surface of the pedal (203) is provided with anti-slip protrusions (2031), which are distributed in a diamond array.

8. The step device according to claim 4, characterized in that, The outer surface of the pedal (203) is provided with an antifreeze coating; the rear of the pedal (203) is provided with an anti-slip tail wing (2032), and the angle between the anti-slip tail wing (2032) and the pedal (203) is 160°~170°; the anti-slip tail wing (2032) is made of elastic rubber.

9. The ladder device according to claim 4, characterized in that, The pedal (203) is equipped with an electric heating component inside. A power supply box (2033) connected to the electric heating component is embedded in the side wall of the pedal (203). A heating switch (2034) is provided on the outer side wall of the power supply box (2033).

10. The ladder device according to claim 1, characterized in that, The mounting bracket (1) has wing plates (9) on its two opposite side walls, and the wing plates (9) and the mounting bracket (1) have multiple threaded holes (10).

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