Labor-saving folding boarding ramp
By using axial elastic elements to connect and fix the loading ladders for agricultural machinery, the problems of high operating intensity and inertial impact of traditional loading ladders are solved, achieving labor-saving folding and extending service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LOVOL HEAVY IND CO LTD
- Filing Date
- 2025-08-22
- Publication Date
- 2026-07-21
AI Technical Summary
Traditional agricultural machinery loading ladders cannot be folded, resulting in high operational intensity and severe inertial impact, which affects their service life.
An axial elastic element is used to connect the fixed car ladder section and the connecting rod. The elastic force reduces the weight of the folding car ladder section, absorbs kinetic energy, reduces the intensity of operation, and reduces impact.
It reduces the workload of folding and unfolding, avoids mechanical damage, and extends service life.
Smart Images
Figure CN224532626U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of agricultural machinery loading ladder technology, specifically to a labor-saving folding loading ladder. Background Technology
[0002] On agricultural machinery such as harvesters, the loading ladders that are traditionally installed are mostly fixed structures that cannot be folded. They are prone to rubbing against obstacles such as plants and buildings, which affects the overall passability of the machine.
[0003] In recent years, foldable loading ramps have appeared on the market, consisting of two sections: a fixed upper section and a folding lower section that folds upwards to the top of the fixed section. These loading ramps are generally made of steel and are quite heavy. When folding, the operator must bear the full weight of the lower folding section and move it upwards a considerable distance. This not only increases the workload and folding difficulty, but also makes it difficult to control the ramp's inertia when unfolding, leading to violent impacts, mechanical damage, and a shortened lifespan. Utility Model Content
[0004] To solve at least one of the above technical problems, this utility model provides a labor-saving folding boarding ladder.
[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: This utility model provides a labor-saving folding boarding ladder, including a fixed boarding ladder section and a folding boarding ladder section. The fixed boarding ladder section is provided with a first connecting rod, a second connecting rod, and an axial elastic element on both sides. The first connecting rod is located below the second connecting rod. The first end of the first connecting rod and the first end of the second connecting rod are both hinged to the side of the fixed boarding ladder section, and the second end of the first connecting rod and the second end of the second connecting rod are both hinged to the side of the folding boarding ladder section. The first end of the axial elastic element is hinged to the side of the fixed boarding ladder section, and the second end of the axial elastic element is hinged to the middle of the second connecting rod.
[0006] The beneficial effects of this utility model are: By employing this invention, the two ends of the axial elastic element are respectively connected to the fixed carriage ladder section and the second connecting rod, so that the elastic force of the axial elastic element acts upward on the second connecting rod, reducing the weight of the folding carriage ladder section borne by the operator, thereby reducing the workload during the folding and unfolding process and making operation convenient. In addition, during the unfolding process, the axial elastic element absorbs part of the kinetic energy of the folding carriage ladder section moving downward, reducing the impact force of the folding carriage ladder section on the fixed carriage ladder section, frame and other structures, avoiding mechanical damage and extending service life.
[0007] Based on the above technical solution, the present invention can be further improved as follows.
[0008] Furthermore, the first end of the first link is hinged to the lower part of the fixed vehicle ladder section, and the second end of the first link is hinged to the middle part of the folding vehicle ladder section; the first end of the second link is hinged to the middle part of the fixed vehicle ladder section, and the second end of the second link is hinged to the upper part of the folding vehicle ladder section.
[0009] When unfolded, the second end of the second link can extend to the lower part of the fixed vehicle ladder section, making it easy to connect the upper part of the folding vehicle ladder section with the lower part of the fixed vehicle ladder section, resulting in good continuity; when folded, the second end of the first link can extend to the middle part of the fixed vehicle ladder section, increasing the overlap between the folding vehicle ladder section and the fixed vehicle ladder section, and taking up less space.
[0010] Furthermore, the axial elastic element is an axially compressed elastic element, and the axial elastic element is located below the second connecting rod.
[0011] The axially compressed elastic element occupies little space and has a compact structure; at the same time, it avoids occupying the space above the second link, allowing the second link to swing upwards to a greater extent and ensuring good folding reliability.
[0012] Furthermore, the axial elastic element is a gas spring.
[0013] It has a long service life, high elasticity and low attenuation, and can withstand more of the weight of the folding bike steps, reducing the workload.
[0014] Furthermore, a limit pin is fixed on the second connecting rod, and a locking limit mechanism is provided on the upper part of the fixed vehicle ladder section. The locking limit mechanism is used to lock and fix the limit pin on the upper part of the fixed vehicle ladder section.
[0015] When the folding cart steps are folded, the second connecting rod and the limit pin rotate to the upper part of the fixed cart steps, and the fixed limit pin is locked by the locking limit mechanism, which improves the stability of the folding cart steps. When it needs to be unfolded, first release the locking limit mechanism from the limit pin, and then the folding cart steps can be flipped down, which is convenient to operate.
[0016] Furthermore, the locking and limiting mechanism includes a locking rocker arm, the middle part of which is rotatably connected to the side of the fixed car ladder section via a torsion spring. A locking groove is provided on the lower side of the first end of the locking rocker arm. The torsion spring is used to drive the first end of the locking rocker arm to move downward and make the locking groove engage with the limiting pin.
[0017] When the limiting pin rotates to the upper part of the fixed car ladder section, the elastic force of the torsion spring drives the first end of the locking rocker arm to move downward and makes the locking groove engage with the limiting pin, making locking convenient.
[0018] Furthermore, the first end of the locking rocker arm transitions at an angle to the opening of the locking groove.
[0019] When the limit pin rotates to the upper part of the fixed car ladder section, the limit pin strikes the inclined surface of the first end of the locking rocker arm, which makes it easier to lift the first end of the locking rocker arm. Thus, the limit pin slides along the inclined transition surface into the locking groove, making locking convenient.
[0020] Furthermore, the second end of the locking rocker arm is bent upward and provided with a pressure plate.
[0021] Simply press down or step on the pressure plate to lift the first end of the locking rocker arm, thereby releasing the lock on the limit pin and making unlocking convenient.
[0022] Furthermore, a vertical cylinder is fixed to the upper end of the fixed car ladder section. The vertical cylinder is located directly above the pressure plate. An unlocking button is slidably installed inside the vertical cylinder. A reset spring is sleeved on the unlocking button, and the reset spring is located above the vertical cylinder. Cotter pins are also inserted into both ends of the unlocking button.
[0023] Guided by the vertical cylinder, pressing or stepping on the unlock button allows it to overcome the spring force of the return spring and press down on the pressure plate, thereby releasing the lock on the limit pin. Unlocking and unfolding can be performed simultaneously, making the operation simple. When the unlock button is released, it returns to its original position under the spring force of the return spring, preventing the pressure plate from bearing excessive pressure and ensuring reliable locking. The cotter pin limits the vertical movement of the unlock button, preventing excessive movement of the unlock button from damaging elastic components such as the torsion spring.
[0024] Furthermore, handrails are fixed on both sides of the folding vehicle ladder section, and the upper end of the handrail extends at least above the upper end of the fixed vehicle ladder section; it also includes a U-shaped reinforcing rod, the two ends of which correspond to and are fixedly connected to the upper ends of the two handrails respectively.
[0025] The handrails provide support for passengers boarding the vehicle, enhancing safety. When unfolded, the U-shaped reinforcing bar can be attached to the upper part of the fixed boarding ladder section, increasing the overall strength of the boarding ladder and improving the stability of the two handrails. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the structure of this utility model.
[0027] Figure 2 This is a schematic diagram of the unfolded state of this utility model.
[0028] Figure 3 This is a schematic diagram of the folded state of this utility model.
[0029] Figure 4 This is a schematic diagram of the locking and limiting mechanism.
[0030] In the accompanying drawings, the technical features represented by each reference numeral are as follows: 1-Fixed trolley step; 2-Folding trolley step; 3-First connecting rod; 4-Second connecting rod; 5-Axial elastic element; 6-Limiting pin; 7-Locking rocker arm; 8-Locking groove; 9-Pressure plate; 10-Vertical cylinder; 11-Unlock button; 12-Reset spring; 13-Cotter pin; 14-Handrail; 15-U-shaped reinforcing bar. Detailed Implementation
[0031] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.
[0032] This utility model refers to Figure 1-4 .
[0033] This utility model provides a labor-saving folding boarding ladder, including a fixed boarding ladder section 1 and a folding boarding ladder section 2. The fixed boarding ladder section 1 is provided with a first connecting rod 3, a second connecting rod 4 and an axial elastic element 5 on both sides. The first connecting rod 3 is located below the second connecting rod 4. The first end of the first connecting rod 3 and the first end of the second connecting rod 4 are both hinged to the side of the fixed boarding ladder section 1, and the second end of the first connecting rod 3 and the second end of the second connecting rod 4 are both hinged to the side of the folding boarding ladder section 2. The first end of the axial elastic element 5 is hinged to the side of the fixed boarding ladder section 1, and the second end of the axial elastic element 5 is hinged to the middle of the second connecting rod 4.
[0034] principle: During installation, the fixed ladder section 1 is fixedly installed on the frame of the agricultural machinery, and the folding ladder section 2 can be lowered and unfolded or folded up.
[0035] When unfolded, as Figure 2 As shown, the folding cart step 2 flips downwards around the first end of the first connecting rod 3 and the second connecting rod 4 until the upper end of the folding cart step 2 overlaps the lower end of the fixed cart step 1. Under the joint limiting of the fixed cart step 1 and the connecting rods, the folding cart step 2 stops flipping and completes the unfolding. During the unfolding process, the folding cart step 2 overcomes the elastic force of the axial elastic element 5. The axial elastic element 5 stores energy and can reduce the kinetic energy of the folding cart step 2 moving downwards, thus reducing the impact force.
[0036] When folded, as Figure 3 As shown, the folding cart step 2 rotates upward around the first end of the first connecting rod 3 and the second connecting rod 4 until the folding cart step 2 moves to the upper side of the fixed cart step 1, at which point the rotation stops, completing the folding process. During the folding process, the axial elastic element 5 releases elastic potential energy, and its elastic force acts upward on the second connecting rod 4, thereby bearing part of the weight of the folding cart step 2 and reducing the weight borne by the operator.
[0037] In summary, by using this utility model, the two ends of the axial elastic element 5 are respectively connected to the fixed carriage ladder section 1 and the second connecting rod 4, so that the elastic force of the axial elastic element 5 acts upward on the second connecting rod 4, reducing the weight of the folding carriage ladder section 2 borne by the operator, thereby reducing the workload of the folding and unfolding process and making operation convenient. In addition, during the unfolding process, the axial elastic element 5 absorbs part of the kinetic energy of the downward movement of the folding carriage ladder section 2, reducing the impact force of the folding carriage ladder section 2 on the fixed carriage ladder section 1, frame and other structures, avoiding mechanical damage and extending service life.
[0038] Furthermore, the first end of the first link 3 is hinged to the lower part of the fixed vehicle ladder section 1, and the second end of the first link 3 is hinged to the middle part of the folding vehicle ladder section 2; the first end of the second link 4 is hinged to the middle part of the fixed vehicle ladder section 1, and the second end of the second link 4 is hinged to the upper part of the folding vehicle ladder section 2.
[0039] When unfolded, the second end of the second link 4 can extend to the lower part of the fixed vehicle ladder section 1, which facilitates the connection between the upper part of the folding vehicle ladder section 2 and the lower part of the fixed vehicle ladder section 1, resulting in good continuity. When folded, the second end of the first link 3 can extend to the middle part of the fixed vehicle ladder section 1, which increases the overlap between the folding vehicle ladder section 2 and the fixed vehicle ladder section 1, and occupies less space.
[0040] Furthermore, the axial elastic element 5 is an axially compressed elastic element, and the axial elastic element 5 is located below the second connecting rod 4.
[0041] Note: Axially compressed elastic elements can be gas springs, compression springs, etc.
[0042] The axially compressed elastic element occupies little space and has a compact structure; at the same time, it avoids occupying the space above the second link 4, allowing the second link 4 to swing upwards to a greater extent and ensuring good folding reliability.
[0043] Furthermore, the axial elastic element 5 is a gas spring.
[0044] It has a long service life, high elasticity and low attenuation, and can withstand more of the weight of the folding cart's second step, reducing the workload.
[0045] Furthermore, a limiting pin 6 is also fixed on the second connecting rod 4, and a locking limiting mechanism is provided on the upper part of the fixed vehicle ladder section 1. The locking limiting mechanism is used to lock and fix the limiting pin 6 to the upper part of the fixed vehicle ladder section 1.
[0046] When the folding cart step 2 is folded, the second connecting rod 4 and the limiting pin 6 rotate to the upper part of the fixed cart step 1. The locking limiting mechanism locks the fixed limiting pin 6, which improves the stability of the folding cart step 2. When it needs to be unfolded, the locking limiting mechanism is first released from the limiting pin 6, and then the folding cart step 2 can be flipped downwards, which is convenient to operate.
[0047] Furthermore, the locking and limiting mechanism includes a locking rocker arm 7. The middle part of the locking rocker arm 7 is rotatably connected to the side of the fixed car ladder section 1 through a torsion spring. The lower side of the first end of the locking rocker arm 7 is provided with a locking groove 8. The torsion spring is used to drive the first end of the locking rocker arm 7 to move downward and make the locking groove 8 engage with the limiting pin 6.
[0048] When the limiting pin 6 rotates to the upper part of the fixed car ladder section 1, the elastic force of the torsion spring drives the first end of the locking rocker arm 7 to move downward and causes the locking groove 8 to engage with the limiting pin 6, making locking convenient.
[0049] Furthermore, the first end of the locking rocker arm 7 transitions at an angle to the opening of the locking groove 8.
[0050] When the limiting pin 6 rotates to the upper part of the fixed car ladder section 1, the limiting pin 6 strikes the inclined surface of the first end of the locking rocker arm 7, which makes it easier to lift the first end of the locking rocker arm 7, so that the limiting pin 6 slides along the inclined transition surface into the locking groove 8, making locking convenient.
[0051] Furthermore, the second end of the locking rocker arm 7 is bent upward and provided with a pressure plate 9.
[0052] Simply press down or step on the pressure plate 9 to lift the first end of the locking rocker arm 7, thereby releasing the lock on the limit pin 6, making unlocking convenient.
[0053] Furthermore, a vertical cylinder 10 is fixed to the upper end of the fixed car ladder section 1. The vertical cylinder 10 is located directly above the pressure plate 9. An unlocking button 11 is slidably arranged inside the vertical cylinder 10. A reset spring 12 is sleeved on the unlocking button 11, and the reset spring 12 is above the vertical cylinder 10. Cotter pins 13 are also inserted into both ends of the unlocking button 11.
[0054] Guided by the vertical cylinder 10, by pressing or stepping on the unlocking button 11, the unlocking button 11 can overcome the elastic force of the return spring 12 and press down on the pressure plate 9, thereby releasing the lock on the limit pin 6. Unlocking and unfolding operations can be performed simultaneously, making the operation easy. When the unlocking button 11 is released, the unlocking button 11 returns to its original position under the elastic force of the return spring 12, avoiding excessive pressure on the pressure plate 9 and ensuring reliable locking. The cotter pin 13 limits the vertical movement of the unlocking button 11, preventing excessive movement of the unlocking button 11 from damaging elastic components such as the torsion spring.
[0055] Furthermore, both sides of the folding vehicle ladder section 2 are fixed with handrails 14, the upper end of the handrails 14 extending at least above the upper end of the fixed vehicle ladder section 1; it also includes a U-shaped reinforcing rod 15, the two ends of the U-shaped reinforcing rod 15 corresponding to and fixedly connected to the upper ends of the two handrails 14 respectively.
[0056] The handrail 14 provides a grip for passengers boarding the vehicle, improving safety. When unfolded, the U-shaped reinforcing bar 15 can be attached to the upper end of the fixed boarding ladder section 1, increasing the overall strength of the boarding ladder and improving the stability of the two handrails 14.
[0057] In the description of this utility model, it should be understood that if descriptive terms indicating orientation, direction, or positional relationship appear, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., the orientation or positional relationship indicated in this specification is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of understanding this utility model and simplifying the description, and does not indicate or imply that the part, element, or whole referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.
[0058] Furthermore, if sequential descriptive terms such as "first," "second," etc., appear, their purpose in this specification is for ease of understanding or simplification. For example, to distinguish multiple technical features of the same type or function, which must be mentioned separately, this specification may use prefixes or suffixes to differentiate them. Therefore, they should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first," "second," etc., may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0059] In this utility model, if descriptive terms describing structural relationships are used, such as "installation," "connection," "joining," and "fixing," they should be interpreted broadly unless otherwise explicitly specified and limited. For example, "installation," "connection," and "joining" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. "Fixing" can refer to an integral fixation or a detachable fixation using fasteners; it can be a direct fixation or a fixation through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood based on the specific circumstances, the context, and the coherence of the preceding and following text.
[0060] In this utility model, if descriptive terms containing subordinate or connecting meanings appear, such as "above" or "below" the second feature, they should not be interpreted restrictively unless otherwise explicitly specified and limited. For example, "above" or "below" can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. For those skilled in the art, the specific meaning of the above descriptive terms in this utility model can be understood according to the specific circumstances, the context, and the coherence of the preceding and following text.
[0061] Furthermore, "above," "on top of," and "above" the first feature in relation to the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments, examples, and features described in this specification, and such combinations or integrations should all fall within the scope of the present invention.
[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Variations, modifications, substitutions, and modifications made by those skilled in the art to the above embodiments within the scope of information available through public channels and in conjunction with the technical teachings given in this application are still covered within the protection scope of this application.
Claims
1. A labor-saving folding boarding ladder, characterized in that: The system includes a fixed vehicle ladder section (1) and a folding vehicle ladder section (2). The fixed vehicle ladder section (1) has a first connecting rod (3), a second connecting rod (4), and an axial elastic element (5) on both sides. The first connecting rod (3) is located below the second connecting rod (4). The first end of the first connecting rod (3) and the first end of the second connecting rod (4) are both hinged to the side of the fixed vehicle ladder section (1). The second end of the first connecting rod (3) and the second end of the second connecting rod (4) are both hinged to the side of the folding vehicle ladder section (2). The first end of the axial elastic element (5) is hinged to the side of the fixed vehicle ladder section (1), and the second end of the axial elastic element (5) is hinged to the middle of the second connecting rod (4).
2. The labor-saving folding boarding ladder according to claim 1, characterized in that: The first end of the first link (3) is hinged to the lower part of the fixed vehicle ladder section (1), and the second end of the first link (3) is hinged to the middle part of the folding vehicle ladder section (2); the first end of the second link (4) is hinged to the middle part of the fixed vehicle ladder section (1), and the second end of the second link (4) is hinged to the upper part of the folding vehicle ladder section (2).
3. The labor-saving folding boarding ladder according to claim 1 or 2, characterized in that: The axial elastic element (5) is an axially compressed elastic element, and the axial elastic element (5) is located below the second connecting rod (4).
4. The labor-saving folding boarding ladder according to claim 3, characterized in that: The axial elastic element (5) is a gas spring.
5. The labor-saving folding boarding ladder according to claim 3, characterized in that: The second connecting rod (4) is also fixed with a limit pin (6). The upper part of the fixed car ladder section (1) is provided with a locking limit mechanism, which is used to lock and fix the limit pin (6) to the upper part of the fixed car ladder section (1).
6. The labor-saving folding boarding ladder according to claim 5, characterized in that: The locking and limiting mechanism includes a locking rocker arm (7). The middle part of the locking rocker arm (7) is rotatably connected to the side of the fixed car ladder section (1) by a torsion spring. The lower side of the first end of the locking rocker arm (7) is provided with a locking groove (8). The torsion spring is used to drive the first end of the locking rocker arm (7) to move downward and make the locking groove (8) engage with the limiting pin (6).
7. The labor-saving folding boarding ladder according to claim 6, characterized in that: The first end of the locking rocker arm (7) transitions at an angle to the opening of the locking groove (8).
8. The labor-saving folding boarding ladder according to claim 6, characterized in that: The second end of the locking rocker arm (7) is bent upward and is provided with a pressure plate (9).
9. The labor-saving folding boarding ladder according to claim 8, characterized in that: The upper end of the fixed car ladder section (1) is also fixed with a vertical cylinder (10). The vertical cylinder (10) is located directly above the pressure plate (9). An unlocking button (11) is slidably installed inside the vertical cylinder (10). A reset spring (12) is sleeved on the unlocking button (11). The reset spring (12) is above the vertical cylinder (10). Cotter pins (13) are also inserted into both ends of the unlocking button (11).
10. The labor-saving folding boarding ladder according to claim 1 or 2, characterized in that: Both sides of the folding car ladder section (2) are fixed with handrails (14), and the upper end of the handrails (14) extends at least to the upper end of the fixed car ladder section (1); it also includes a U-shaped reinforcing rod (15), the two ends of the U-shaped reinforcing rod (15) corresponding to and fixedly connected to the upper ends of the two handrails (14).