Ladder and foldable handrail for heavy duty truck

Abstract

The application discloses a loading truck ladder and a foldable handrail thereof, and relates to the technical field of truck ladders. The foldable handrail comprises a handle part, a connecting part fixedly connected with the handle part, a first fixing part comprising a first mounting plate, a first fixing plate and a second fixing plate, a second fixing part comprising a second mounting plate and two third fixing plates, a first fixing hole arranged on the first fixing plate, a second fixing hole, a first limiting hole and a second limiting hole arranged on the second fixing plate, a third fixing hole arranged on the third fixing plate, a locking part comprising a pull ring, a locking piece and an elastic piece, the handle part being in a folded state when a second end of the locking piece protrudes from the first limiting hole, the handle part being in a working state when the second end protrudes from the second limiting hole, and two fixing assemblies arranged in a first direction. The loading truck ladder and the foldable handrail thereof enable the handrail to be folded and stored, reduce the occupied space of the handrail, and protect the handrail during vehicle travel.

Description

Technical Field

[0001] This specification relates to the field of truck ladder technology, and more particularly to a heavy-duty truck ladder and its foldable handrail. Background Technology

[0002] The word "ladder" has various meanings, including steps, stairs, folding ladders of different sizes, and extension ladders. Ladders are used to reach many different heights, including changing light bulbs, reaching into tall cabinets, climbing onto roofs, and climbing onto trucks or RVs.

[0003] Truck ladders are foldable or extendable metal ladders, typically fixed to the rear tailgate or side of a truck for passengers to access the cargo area. Common truck ladders on the market usually have welded handrails, which cannot be folded away while the vehicle is in motion. This not only takes up space but also poses a risk of scratching the handrails during vehicle movement. For example, in patent application number 202411611829.5, entitled "Foldable Extendable Ladder," the handrails are welded to the outer ladder. Utility Model Content

[0004] In view of the shortcomings of the prior art, one object of this specification is to provide a ladder for heavy-duty trucks and a foldable handrail thereof, which allows the handrail to be folded and stored, reducing the space occupied by the handrail and protecting the handrail during vehicle movement.

[0005] To achieve the above objectives, this specification provides a foldable handrail for a ladder used in heavy-duty trucks, comprising: The handle is for gripping; Two connecting portions are spaced apart in a first direction, and one end of each connecting portion is fixedly connected to the handle portion; A first fixing part and a second fixing part are spaced apart in a first direction; the first fixing part includes a first mounting plate, a first fixing plate, and a second fixing plate; the second fixing part includes a second mounting plate and two third fixing plates; the first fixing plate, the second fixing plate, and the third fixing plates are all perpendicular to the first direction; the first fixing plate is provided with a first fixing hole, and the second fixing plate is provided with a second fixing hole, a first limiting hole, and a second limiting hole; the first fixing plate is located on the side of the second fixing plate opposite to the third fixing plate; the third fixing plate is provided with a third fixing hole, and the first fixing hole, the second fixing hole, and the third fixing hole are aligned in the first direction. The locking part connected to the first fixing part includes a pull ring, a locking member, and an elastic member; the locking member has a first end facing away from the second fixing part and a second end facing the second fixing part, the first end is located outside the connecting part, and the pull ring is connected to the first end; the elastic member abuts between the second end and the connecting part; when the second end protrudes from the first limiting hole, the handle part is in a folded state; when the second end protrudes from the second limiting hole, the handle part is in a working state; Two fixing components spaced apart in a first direction are used to rotatably fix the other ends of the two connecting parts to the first fixing part and the second fixing part, respectively.

[0006] In a preferred embodiment, the connecting part includes a first straight pipe, a bent pipe, and a second straight pipe connected in sequence; the first straight pipe and the second straight pipe are perpendicular to each other; the first straight pipe is fixedly connected to the handle part; and the second straight pipe is rotatably fixedly connected to the first fixing part or the second fixing part.

[0007] In a preferred embodiment, the first mounting plate is parallel to the first direction and has a first mounting hole; the second mounting plate is parallel to the first direction and has a second mounting hole.

[0008] In a preferred embodiment, the first fixing part further includes a first connecting plate; the first connecting plate is connected to a first fixing plate and a second fixing plate at both ends in a first direction; the first connecting plate is connected to two first mounting plates at both ends in a second direction; a U-shaped space for the connecting part to rotate is formed between the first fixing plate, the first connecting plate and the second fixing plate; the second direction is perpendicular to the first direction.

[0009] In a preferred embodiment, the second fixing part further includes a second connecting plate; the second connecting plate is connected to two third fixing plates at both ends in the first direction; the second connecting plate is connected to two second mounting plates at both ends in the second direction; a U-shaped space is formed between the second connecting plate and the two third fixing plates for the connecting part to rotate.

[0010] In a preferred embodiment, the first fixing plate is L-shaped, and the first end of the pull ring and locking member protrudes from the notch of the L-shaped first fixing plate; the second fixing plate and the third fixing plate are the same shape and are both rectangular, the bottom of the second fixing plate is connected to the first positioning plate, and the bottom of the third fixing plate away from the first fixing part is connected to the second positioning plate; when the handle is in the folded state, the connecting part does not contact the first positioning plate and the second positioning plate; when the handle is in the working state, the connecting part contacts the first positioning plate and the second positioning plate and is limited.

[0011] In a preferred embodiment, the first fixing part and the second fixing part are integrally formed.

[0012] In a preferred embodiment, a fixing component is sequentially inserted through a first fixing hole, a connecting portion, and a second fixing hole, and another fixing component is sequentially inserted through a third fixing hole, a connecting portion, and another third fixing hole; the fixing component includes: a bolt extending along a first direction and a lock nut that matches the bolt.

[0013] This application also provides a ladder for heavy-duty trucks, including: a main ladder and a foldable handrail as described in any of the above embodiments, wherein the foldable handrail is connected to the main ladder via a first fixing part and a second fixing part.

[0014] In a preferred embodiment, the truck ladder includes two foldable handrails, which are spaced apart and opposite to each other in a third direction; the third direction is perpendicular to the first direction. Beneficial effects

[0015] The foldable handrail for a truck ladder provided in this embodiment includes a handle, a connecting part, a first fixing part, a second fixing part, a locking part, and a fixing assembly. The foldable handrail can be connected to the main ladder of the truck ladder via the first and second fixing parts. By providing a locking part including a pull ring, a locking element, and an elastic element, which cooperates with the first and second limiting holes of the first fixing part, the connecting part and the handle can rotate relative to the first and second fixing parts, thereby switching between a folded state and a working state. By providing the fixing assembly, the connecting part can be rotatably and fixedly connected to the first and second fixing parts, and the connecting part drives the handle to rotate around the center line of the fixing assembly.

[0016] Furthermore, the locking mechanism features a clever design. Simply tightening the pull ring allows for quick switching of the handle's position, and the pull ring is located on the side furthest from the second fixing part (i.e., facing the operator), facilitating easy handle position switching. The elastic element abuts against the locking element, allowing it to be quickly pushed out of the first or second limiting hole when it is in position, thus locking the handle in either the folded or working state.

[0017] In summary, this foldable handrail allows for easy storage, reducing the space occupied by the handrail and ladder, and protecting the handrail during vehicle movement. Furthermore, the foldable handrail has a simple structure, is easy to operate, and is safe and reliable, enabling quick switching between folded and working states.

[0018] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be employed. It should be understood that the scope of the embodiments of the present invention is not limited thereto.

[0019] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0020] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of a ladder for heavy-duty trucks provided in this embodiment, with its foldable handrail in a working state; Figure 2 This is a three-dimensional structural diagram of another type of ladder for heavy-duty trucks provided in this embodiment, with its foldable handrail in a folded state; Figure 3 for Figure 1 A schematic diagram of the foldable armrest in the middle; Figure 4 for Figure 3 Another structural diagram from a different perspective; Figure 5 for Figure 3 A schematic diagram of the structure of the first fixing part, the locking part, and the fixing component; Figure 6 for Figure 5 Schematic diagram of the first fixing part; Figure 7 for Figure 3 Schematic diagram of the structure of the second fixing part and fixing assembly; Figure 8 for Figure 7 Schematic diagram of the structure of the second fixing part; Figure 9 for Figure 2 A schematic diagram of the foldable armrest in the middle; Figure 10 for Figure 9 Another structural diagram from another perspective.

[0023] Explanation of reference numerals in the attached figures: 10. Foldable handrail; 1. Handle part; 2. Connecting part; 21. First straight tube; 22. Bend; 23. Second straight tube; 3. First fixing part; 31. First mounting plate; 311. First mounting hole; 32. First fixing plate; 321. First fixing hole; 33. Second fixing plate; 331. Second fixing hole; 332. First limiting hole; 333. Second limiting hole; 34. First connecting plate; 35. First positioning plate; 4. Second fixing part; 41. Second mounting plate; 411. Second mounting hole; 42. Third fixing plate; 421. Third fixing hole; 43. Second connecting plate; 44. Second positioning plate; 5. Locking part; 51. Pull ring; 52. Locking element; 521. First end; 522. Second end; 53. Elastic element; 6. Fixing assembly; 61. Bolt; 62. Anti-loosening nut; 7. U-shaped space; 20. Main elevator; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0025] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or may be interposed with another element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or may be interposed with another element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Please see Figures 1 to 10 This application provides a foldable handrail 10 for a ladder for heavy-duty trucks, including: a handle portion 1, a connecting portion 2, a first fixing portion 3, a second fixing portion 4, a locking portion 5, and a fixing component 6.

[0028] The handle 1 is for gripping. For example... Figure 3 and Figure 9 As shown, two connecting parts 2 are spaced apart in the first direction X. One end of each connecting part 2 is fixedly connected to the handle part 1, and the other end is rotatably fixedly connected to the first fixing part 3 and the second fixing part 4. The first fixing part 3 and the second fixing part 4 are spaced apart in the first direction X. Figure 6 As shown, the first fixing part 3 includes a first mounting plate 31, a first fixing plate 32, and a second fixing plate 33. (As indicated...) Figure 8 As shown, the second fixing part 4 includes a second mounting plate 41 and two third fixing plates 42. The first fixing plate 32, the second fixing plate 33, and the third fixing plate 42 are all perpendicular to the first direction X. The first fixing plate 32 has a first fixing hole 321. The second fixing plate 33 has a second fixing hole 331, a first limiting hole 332, and a second limiting hole 333. The first fixing plate 32 is located on the side of the second fixing plate 33 opposite to the third fixing plate 42. The third fixing plate 42 has a third fixing hole 421. The first fixing hole 321, the second fixing hole 331, and the third fixing hole 421 are aligned in the first direction X, providing the possibility for rotation of the connecting part 2 and the handle part 1.

[0029] like Figure 5 As shown, the locking part 5 is connected to the first fixing part 3. The locking part 5 includes a pull ring 51, a locking member 52, and an elastic member 53. The locking member 52 has a first end 521 facing away from the second fixing part 4 and a second end 522 facing the second fixing part 4. The first end 521 is located outside the connecting part 2, and the pull ring 51 is connected to the first end 521. The elastic member 53 abuts between the second end 522 and the connecting part 2. When the second end 522 protrudes from the first limiting hole 332, the handle part 1 is in a folded state, as shown. Figure 2 , Figure 9 and Figure 10 As shown. When the second end 522 protrudes from the second limiting hole 333, the handle part 1 is in the working state, as... Figure 1 , Figure 3 and Figure 4 As shown.

[0030] like Figure 3 and Figure 4 As shown, two fixing components 6 are spaced apart in the first direction X, and are used to rotatably fix the other ends of the two connecting parts 2 to the first fixing part 3 and the second fixing part 4 respectively.

[0031] The foldable handrail 10 for a heavy-duty truck ladder provided in this embodiment includes a handle portion 1, a connecting portion 2, a first fixing portion 3, a second fixing portion 4, a locking portion 5, and a fixing assembly 6. The foldable handrail 10 can be connected to the main ladder 20 of the heavy-duty truck ladder via the first fixing portion 3 and the second fixing portion 4. By providing the locking portion 5, which includes a pull ring 51, a locking member 52, and an elastic member 53, and cooperating with the first limiting hole 332 and the second limiting hole 333 of the first fixing portion 3, the connecting portion 2 and the handle portion 1 can rotate relative to the first fixing portion 3 and the second fixing portion 4, thereby switching between a folded state and a working state. By providing the fixing assembly 6, the connecting portion 2 can be rotatably and fixedly connected to the first fixing portion 3 and the second fixing portion 4, and the connecting portion 2 drives the handle portion 1 to rotate around the center line of the fixing assembly 6.

[0032] Furthermore, the locking part 5 has an ingenious structure. By simply tightening the pull ring 51, the state of the handle part 1 can be quickly switched. The pull ring 51 is located on the side away from the second fixing part 4 (i.e., the pull ring 51 is positioned facing the operator), which facilitates the operator's operation of switching the state of the handle part 1. Through the abutment of the elastic member 53 against the locking member 52, when the locking member 52 is located in the first limiting hole 332 or the second limiting hole 333, the locking member 52 can be quickly pushed out and protrude from the first limiting hole 332 or the second limiting hole 333, thereby locking the handle part 1 in the folded state or the working state and preventing the handrail 10 from shaking during vehicle movement.

[0033] In summary, the foldable handrail 10 allows the handrail to be folded and stored, reducing the space occupied by the handrail and protecting the handrail during vehicle movement. Furthermore, the foldable handrail 10 has a simple structure, is easy to operate, and can quickly switch between folded and working states.

[0034] In this embodiment, such as Figure 3 and Figure 4 As shown, the connecting part 2 includes a first straight pipe 21, a bent pipe 22, and a second straight pipe 23 connected in sequence. The first straight pipe 21 and the second straight pipe 23 are perpendicular to each other. The first straight pipe 21 is fixedly connected to the handle part 1. The second straight pipe 23 is rotatably fixedly connected to either the first fixing part 3 or the second fixing part 4. When the handle part 1 is in the folded state, the first straight pipe 21 extends along the third direction Z, and the second straight pipe 23 extends along the second direction Y; when the handle part 1 is in the working state, the first straight pipe 21 extends along the second direction Y, and the second straight pipe 23 extends along the third direction Z. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0035] like Figure 1 and Figure 2 As shown, the ladder for heavy-duty trucks may include two foldable handrails 10, which are spaced apart and opposite to each other in the third direction Z.

[0036] In this embodiment, the first mounting plate 31 is parallel to the first direction X and has a first mounting hole 311. The second mounting plate 41 is parallel to the first direction X and has a second mounting hole 411. Each first mounting plate 31 may have two first mounting holes 311 spaced apart in the first direction X, and each second mounting plate 41 may have two second mounting holes 411 spaced apart in the first direction X. The first mounting holes 311 and the second mounting holes 411 provide mounting positions for fixing the foldable handrail 10 and the main ladder 20.

[0037] like Figure 6 As shown, the first fixing part 3 also includes a first connecting plate 34. The first connecting plate 34 is connected to the first fixing plate 32 and the second fixing plate 33 at both ends in the first direction X, respectively. The first connecting plate 34 is connected to two first mounting plates 31 at both ends in the second direction Y, respectively. A U-shaped space 7 for the connecting part 2 to rotate is formed between the first fixing plate 32, the first connecting plate 34 and the second fixing plate 33.

[0038] like Figure 8 As shown, the second fixing part 4 also includes a second connecting plate 43. The second connecting plate 43 is connected to two third fixing plates 42 at both ends in the first direction X. The second connecting plate 43 is connected to two second mounting plates 41 at both ends in the second direction Y. A U-shaped space 7 for the connecting part 2 to rotate is formed between the second connecting plate 43 and the two third fixing plates 42.

[0039] Specifically, such as Figure 3 and Figure 5 As shown, the first fixing plate 32 is L-shaped, and the first ends 521 of the pull ring 51 and the locking member 52 protrude from the notch of the L-shaped first fixing plate 32. The second fixing plate 33 and the third fixing plate 42 have the same shape and are both rectangular. The bottom of the second fixing plate 33 is connected to the first positioning plate 35, and the bottom of the third fixing plate 42, which is away from the first fixing part 3, is connected to the second positioning plate 44. When the handle part 1 is in the folded state, the connecting part 2 does not contact the first positioning plate 35 and the second positioning plate 44; when the handle part 1 is in the working state, the connecting part 2 contacts the first positioning plate 35 and the second positioning plate 44 and is limited, which can provide a certain degree of protection for the connecting part 2.

[0040] Preferably, Figure 6 The first fixing part 3 shown is integrally formed. Figure 8 The second fixing part 4 shown is integrally set, which can simplify the manufacturing process and improve the strength of the foldable armrest 10.

[0041] In this embodiment, such as Figure 5 and Figure 7As shown, one fixing component 6 is sequentially inserted through the first fixing hole 321, the connecting part 2, and the second fixing hole 331, and another fixing component 6 is sequentially inserted through the third fixing hole 421, the connecting part 2, and another third fixing hole 421. The fixing component 6 includes: a bolt 61 extending along the first direction X and a locking nut 62 matching the bolt 61. Preferably, the bolt 61 is an M8 socket head cap screw 61, and the locking nut 62 is preferably a flanged nylon locking nut 62.

[0042] In this embodiment, the line connecting the center of the first limiting hole 332 and the center of the first fixing hole 321 extends along the second direction Y, and the line connecting the center of the second limiting hole 333 and the center of the first fixing hole 321 extends along the third direction Z, so that the handle 1 and the connecting part 2 can be switched between the folded state and the working state by rotating 90°.

[0043] Based on the same concept, this utility model also provides a ladder for heavy-duty trucks, as described in the following embodiments. Since the principle of solving the problem and the technical effects that can be achieved by this ladder for heavy-duty trucks are similar to those of the foldable handrail 10 described above, the implementation of this ladder for heavy-duty trucks can refer to the implementation of the foldable handrail 10 described above, and the repeated parts will not be described again.

[0044] One embodiment of the present invention also provides a ladder for heavy-duty trucks, including: a main ladder 20 and a foldable handrail 10 as described in any of the above embodiments, wherein the foldable handrail 10 is connected to the main ladder 20 via a first fixing part 3 and a second fixing part 4.

[0045] It should be noted that the main ladder 20 and other parts (such as the platform part) of the truck ladder provided in this embodiment can be selected from any suitable existing structure. For example, the structure other than the handrail can be selected from the application with application number 202411611829.5 entitled "Foldable Telescopic Ladder". To clearly and concisely illustrate the technical solution provided in this embodiment, the above parts will not be described in detail here, and the accompanying drawings have also been simplified accordingly. However, it should be understood that this embodiment is not limited in scope as a result.

[0046] Specifically, such as Figure 1 and Figure 2 As shown, the ladder for heavy-duty trucks may include two foldable handrails 10, which are spaced apart and opposite each other in the third direction Z. The dimensions of the main ladder 20 and the connecting part 2 need to be designed so that the two handrails 10 do not interfere with each other when folded.

[0047] It should be noted that in the description of this specification, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this specification, unless otherwise stated, "a plurality of" means two or more.

[0048] Any numerical values ​​cited herein include all values ​​ranging from a lower limit to an upper limit, increasing by one unit, with at least two units between any lower and any higher value. For example, if the quantity of a component or the value of a process variable (e.g., temperature, pressure, time, etc.) is described as being from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70, the purpose is to illustrate that values ​​such as 15 to 85, 22 to 68, 43 to 51, 30 to 32 are also explicitly listed in this specification. For values ​​less than 1, a unit is appropriately considered to be 0.0001, 0.001, 0.01, 0.1, etc. These are merely examples intended for explicit expression, and it can be assumed that all possible combinations of values ​​listed between the minimum and maximum values ​​are explicitly described in this specification in a similar manner.

[0049] Unless otherwise stated, all ranges include the endpoints and all numbers between them. The terms "approximately" or "about" used with ranges apply to both endpoints of the range. Thus, "approximately 20 to 30" is intended to cover "approximately 20 to approximately 30," including at least the specified endpoints.

[0050] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified elements, components, parts, or steps, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute included by “may” is optional.

[0051] Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The use of "a" or "an" to describe an element, component, part, or step does not imply the exclusion of other elements, components, parts, or steps.

[0052] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this teaching should not be determined by reference to the above description, but rather by reference to the appended claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the inventors have not considered that subject matter as part of the disclosed utility model subject matter.

Claims

1. A foldable handrail for a ladder used in heavy-duty trucks, characterized in that, include: The handle is for gripping; Two connecting portions are spaced apart in a first direction, and one end of each connecting portion is fixedly connected to the handle portion; A first fixing part and a second fixing part are spaced apart in a first direction; the first fixing part includes a first mounting plate, a first fixing plate, and a second fixing plate; the second fixing part includes a second mounting plate and two third fixing plates; the first fixing plate, the second fixing plate, and the third fixing plates are all perpendicular to the first direction; the first fixing plate is provided with a first fixing hole, and the second fixing plate is provided with a second fixing hole, a first limiting hole, and a second limiting hole; the first fixing plate is located on the side of the second fixing plate opposite to the third fixing plate; the third fixing plate is provided with a third fixing hole, and the first fixing hole, the second fixing hole, and the third fixing hole are aligned in the first direction. The locking part connected to the first fixing part includes a pull ring, a locking member, and an elastic member; the locking member has a first end facing away from the second fixing part and a second end facing the second fixing part, the first end is located outside the connecting part, and the pull ring is connected to the first end; the elastic member abuts between the second end and the connecting part; when the second end protrudes from the first limiting hole, the handle part is in a folded state; when the second end protrudes from the second limiting hole, the handle part is in a working state; Two fixing components spaced apart in a first direction are used to rotatably fix the other ends of the two connecting parts to the first fixing part and the second fixing part, respectively.

2. The foldable armrest according to claim 1, characterized in that, The connecting part includes a first straight pipe, a bent pipe, and a second straight pipe connected in sequence; the first straight pipe and the second straight pipe are perpendicular to each other; the first straight pipe is fixedly connected to the handle part; the second straight pipe is rotatably fixedly connected to the first fixing part or the second fixing part.

3. The foldable armrest according to claim 1, characterized in that, The first mounting plate is parallel to the first direction and has a first mounting hole; the second mounting plate is parallel to the first direction and has a second mounting hole.

4. The foldable armrest according to claim 1, characterized in that, The first fixing part further includes a first connecting plate; the first connecting plate is connected to a first fixing plate and a second fixing plate at both ends in a first direction; the first connecting plate is connected to two first mounting plates at both ends in a second direction; a U-shaped space for the connecting part to rotate is formed between the first fixing plate, the first connecting plate and the second fixing plate; the second direction is perpendicular to the first direction.

5. The foldable armrest according to claim 4, characterized in that, The second fixing part further includes a second connecting plate; the two ends of the second connecting plate in the first direction are respectively connected to two third fixing plates; the two ends of the second connecting plate in the second direction are respectively connected to two second mounting plates; a U-shaped space for the connecting part to rotate is formed between the second connecting plate and the two third fixing plates.

6. The foldable armrest according to claim 1, characterized in that, The first fixing plate is L-shaped, and the first end of the pull ring and locking member protrudes from the notch of the L-shaped first fixing plate; the second fixing plate and the third fixing plate are the same shape and are both rectangular, the bottom of the second fixing plate is connected to the first positioning plate, and the bottom of the third fixing plate away from the first fixing part is connected to the second positioning plate; when the handle is in the folded state, the connecting part does not contact the first positioning plate and the second positioning plate; when the handle is in the working state, the connecting part contacts the first positioning plate and the second positioning plate and is limited.

7. The foldable armrest according to claim 6, characterized in that, The first fixing part is integrally formed, and the second fixing part is integrally formed.

8. The foldable armrest according to claim 1, characterized in that, One fixing component is sequentially inserted through the first fixing hole, the connecting part, and the second fixing hole; another fixing component is sequentially inserted through the third fixing hole, the connecting part, and another third fixing hole; the fixing component includes: a bolt extending along a first direction and a lock nut that matches the bolt.

9. A ladder for heavy-duty trucks, characterized in that, include: The main ladder and the foldable handrail as described in any one of claims 1-8, wherein the foldable handrail is connected to the main ladder via a first fixing part and a second fixing part.

10. The ladder for heavy-duty trucks according to claim 9, characterized in that, The truck ladder includes two foldable handrails, which are spaced apart and opposite each other in a third direction; the third direction is perpendicular to the first direction.

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