Latent forklift chassis with auxiliary support

Abstract

This utility model discloses a forklift chassis with auxiliary support, relating to the field of forklift equipment technology. It includes a frame with a central frame located in the middle. The central frame has an auxiliary support wheel assembly, which includes vertically floating swivel casters. Each caster is rotatably connected to a caster fixing plate. The caster fixing plate is hinged to a vertical plate and has a sliding hole at its other end. A limit screw is slidably connected to the sliding hole, and a compression spring is fitted onto the limit screw. The compression spring is fixed to the central frame by a spring fixing plate. This utility model provides a forklift chassis with auxiliary support, reducing deformation and vibration caused by excessively long central cantilever arms, and improving the overall stability of the vehicle.

Description

Technical Field

[0001] This utility model relates to the field of transport forklift equipment technology, specifically to a forklift chassis with auxiliary support. Background Technology

[0002] In existing technologies, the chassis of forklifts commonly adopt a "mountain"-shaped frame layout. The main problem with this structure is that the central cantilever section is designed to be relatively long. Due to the lack of effective support, this excessively long cantilever is prone to significant elastic deformation during load-bearing and operation. This deformation not only affects the stability of the frame structure but also directly causes unnecessary vibrations during vehicle operation, thus affecting the overall smoothness and handling precision of the vehicle. Therefore, how to effectively suppress the deformation and vibration of the central cantilever, and improve the rigidity and overall stability of the forklift chassis, is a technical problem that urgently needs improvement. Utility Model Content

[0003] Technical problem to be solved by the utility model

[0004] The technical problem to be solved by this utility model is to provide a forklift chassis with auxiliary support, which reduces deformation and vibration caused by excessively long intermediate cantilever, and improves the stability of the whole vehicle.

[0005] Technical solution

[0006] To solve the above problems, the technical solution provided by this utility model is as follows:

[0007] A forklift chassis with auxiliary support includes a frame, a center frame located in the middle of the frame, an auxiliary support wheel assembly, and an auxiliary support wheel assembly including vertically and vertically elastically floating swivel casters. The swivel casters are rotatably connected to a caster fixing plate, the caster fixing plate is hinged to a vertical plate and has a sliding hole at its other end, a limit screw is slidably connected to the sliding hole, a compression spring is sleeved on the limit screw, and the compression spring is fixed to the center frame by a spring fixing plate.

[0008] Omnidirectional casters: provide additional ground support points, enabling flexible steering and vertical floating capability.

[0009] Caster mounting plate: Supports the caster and connects the hinge point to the floating mechanism.

[0010] Vertical plate (hinge point): Allows the caster assembly to swing in the vertical plane to adapt to the road surface.

[0011] Sliding holes: provide guide channels for the caster mounting plate to float up and down.

[0012] Limit screw: limits the floating stroke and provides floating guidance.

[0013] Compression springs provide elastic support, absorb shocks and vibrations, and achieve "elastic floating".

[0014] Spring fixing plate: Securely fix the lower end of the compression spring to the middle frame.

[0015] Optionally, the caster fixing plate has a beveled section at one end near the compression spring, the beveled section bends toward the swivel caster, and the beveled section leaves space for accommodating the compression spring.

[0016] The auxiliary support wheel assembly, through the spring force of the compression spring, ensures that the swivel casters maintain a certain pressure in contact with the ground, adding a dynamically adjustable elastic support point below the central cantilever. The sloped section design not only optimizes the spatial layout but, more importantly, alters the direction of force transmission: the vertical spring force is partially converted into a horizontal force towards the swivel casters at the sloped section. This significantly enhances the contact stability between the swivel casters and the ground, effectively suppressing potential lateral displacement or swaying of the support point. When the cantilever attempts to deform downwards due to load or bumps, the compression spring, through the sloped section, provides a more stable upward support force to resist this, reducing the deformation amplitude. Simultaneously, the floating capability of the swivel casters, the cushioning effect of the springs, and the lateral stability provided by the sloped section collectively absorb and isolate impacts from the ground and vibrations generated during operation, thus more effectively reducing shaking caused by cantilever deformation.

[0017] Optionally, the end of the inclined section is provided with a flat section, and the sliding hole is disposed on the flat section.

[0018] The addition of the planar section significantly improves the reliability, precision, and durability of the entire floating mechanism: it ensures precise fit and smooth sliding of the sliding holes and limit screws, provides a reliable installation and force-bearing plane, and makes the transmission of spring force more direct and stable. When the cantilever attempts to deform downwards due to load or bumps, the compression spring provides more stable and reliable upward support through the planar and inclined sections to resist this, effectively reducing the deformation amplitude. At the same time, the floating capability of the swivel casters, the damping and vibration absorption effect of the springs, and the lateral stability effect brought by the inclined section work together to efficiently absorb and isolate impacts and vibrations, thereby more effectively suppressing the shaking phenomenon caused by cantilever deformation, ultimately significantly improving the rigidity of the central area of ​​the frame and the overall running stability of the vehicle.

[0019] Optionally, the auxiliary support wheel assembly is concealed within the central frame, which has openings that allow the swivel casters to protrude.

[0020] By integrating the entire sophisticated and critical elastic support mechanism into the midframe and exposing only the ground contact portion of the swivel casters through precise openings, the issues of protection, space occupation, and safety are perfectly resolved. Under harsh working conditions, the internal components are exceptionally protected from external damage. The chassis has a smoother appearance, with no exposed protruding parts to interfere. Despite being concealed, its core vibration damping and stabilization mechanism operates efficiently: compression springs transmit elastic force to the swivel casters through the caster mounting plates (especially the ramp and flat sections), providing dynamic elastic support upon ground contact. When the mid-frame cantilever is loaded or subjected to impact, this support point effectively resists deformation and absorbs and isolates vibrations through the springs. The ramp section further enhances the lateral stability of the swivel casters.

[0021] Optionally, the top of the swivel caster is rotatably connected to the caster mounting plate via a bearing seat and bolts.

[0022] The bearing housing significantly reduces steering resistance, making the vehicle easier and more agile to steer in tight spaces, while also bearing heavy loads and reducing wear. Bolted connections ensure secure installation and easy maintenance. This optimization is perfectly integrated with other core features of the component (elastic floating, ramp stabilization, reliable flat section, and concealed protection). Compression springs transfer elastic force to the swivel casters via the caster mounting plate, providing dynamic elastic support upon ground contact and effectively resisting downward deformation of the central cantilever of the frame. The ramp section converts some of the spring force into a horizontal component, enhancing the lateral ground contact stability of the swivel casters. Sliding holes and limit screws precisely control the floating travel. The design, concealed within the center frame, maximizes protection of the entire component, including the precision bearing housing, from external environmental damage, keeping the chassis clean and safe.

[0023] Optionally, a bushing is provided at the end of the caster fixing plate away from the compression spring, and a hinge shaft is fitted on the bushing. The two ends of the hinge shaft are fixed to the vertical plate, and the vertical plate is fixed to the auxiliary support base.

[0024] It allows the caster mounting plate assembly to swing freely around a horizontal axis, flexibly adapting to uneven ground, a prerequisite for effective elastic support. The bushing design significantly reduces rotational friction and wear, improving durability and maintainability. The articulated shaft provides a precise and rigid center of rotation. The vertical plate, acting as a robust support arm, firmly supports and transmits the load. Ultimately, all loads are efficiently distributed to the main structure of the frame through the robust mounting platform of the auxiliary support base. This sophisticated articulation mechanism is perfectly integrated with the previously analyzed elastic floating mechanism (sliding hole / limit screw / compression spring), force optimization mechanism (sloping section), protective mechanism (concealed design), and efficient steering mechanism (swivel casters / bearing housings).

[0025] Optionally, the swivel casters are flush with the other wheels of the frame when stationary.

[0026] By combining the precise pre-compression of the compression springs with the hard limiting action of the limiting screws / sliding holes, the auxiliary wheels are ensured to be in the ideal position for effectively distributing the load when the vehicle is stationary. This brings several significant advantages: 1. Elimination of initial deformation: The center frame cantilever is effectively supported when stationary, significantly reducing initial bending; 2. Improved static stability: The entire vehicle weight is evenly borne by all wheels, resulting in a more stable posture; 3. Optimized operational response: When the vehicle starts or encounters bumps, the auxiliary wheels, already under load and possessing elasticity (spring pre-compression), can respond instantly and without delay to deformation and impact, providing more timely and smooth support and vibration damping, greatly suppressing shaking; 4. Protection of the main drive system: Preventing the main wheels from overloading or slipping due to the auxiliary wheels being suspended in the air.

[0027] Alternatively, the frame may be a one-piece molded structure.

[0028] The auxiliary support wheel assembly integrated into the one-piece frame achieves a qualitative leap in performance: 1. Doubled deformation suppression: The auxiliary support wheel dynamically resists cantilever bending, while the ultra-high rigidity of the one-piece frame itself has greatly reduced the bending tendency. The synergistic effect of the two makes cantilever deformation almost eliminated; 2. Optimized vibration reduction performance: The more stable foundation allows the compression spring to absorb and isolate high-frequency vibrations during operation more purely and efficiently, rather than being consumed in overcoming the flexible deformation of the frame itself; 3. Leap in system reliability: The durability of the one-piece frame combined with the protection of the hidden components allows the entire chassis system to maintain excellent performance under harsh working conditions and long-term use; 4. Superior overall vehicle performance: From stationary (with all wheels evenly bearing load) to running (no shaking, precise control), the Lurker forklift exhibits top-level rigidity, stability, reliability, and responsiveness.

[0029] Beneficial effects

[0030] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0031] The technical solution provided by this utility model utilizes the elastic force of a compression spring to ensure that the swivel casters always maintain a certain pressure in contact with the ground, while adding a dynamically adjustable elastic support point below the central cantilever. When the cantilever attempts to deform downwards due to load or bumps, the compression spring provides upward support to resist this, effectively reducing the deformation amplitude. Simultaneously, the floating capability of the swivel casters and the cushioning effect of the springs significantly absorb and isolate impacts from the ground and vibrations generated during operation, thereby greatly reducing vibrations caused by cantilever deformation. Ultimately, by adding this elastic intermediate support, the rigidity and overall stability of the frame (especially the central cantilever area) are enhanced. Attached Figure Description

[0032] Figure 1A schematic diagram of a submerged forklift chassis with auxiliary support, proposed as an embodiment of this utility model;

[0033] Figure 2 A bottom view of a forklift chassis with auxiliary support proposed in an embodiment of this utility model;

[0034] Figure 3 A schematic diagram of the structure of an auxiliary support wheel assembly for a lurking forklift chassis with auxiliary support, as proposed in an embodiment of this utility model;

[0035] Figure 4 A side view of a lurking forklift chassis with auxiliary support, as proposed in an embodiment of this utility model;

[0036] 1. Frame; 2. Fork slot; 3. Center frame; 4. Auxiliary support wheel assembly; 41. Auxiliary support seat; 42. Hinge shaft; 43. Caster mounting plate; 44. Swivel caster; 45. Compression spring; 46. Spring mounting plate; 47. Vertical plate; 48. Limit screw; 49. Bearing seat; 5. Floating drive wheel; 6. Floating driven wheel; 7. Drive auxiliary wheel. Detailed Implementation

[0037] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0038] Example

[0039] Combined with appendix Figure 1-2 A forklift chassis with auxiliary support includes a frame 1, a middle frame 3 located in the middle of the frame 1, an auxiliary support wheel assembly 4, the auxiliary support wheel assembly 4 including vertically and vertically elastically floating swivel casters 44, the swivel casters 44 being rotatably connected to a caster fixing plate 43, the caster fixing plate 43 being hinged to a vertical plate 47 and having a sliding hole at the other end, a limit screw 48 being slidably connected to the sliding hole, a compression spring 45 being sleeved on the limit screw 48, and the compression spring 45 being fixed to the middle frame 3 by a spring fixing plate 46.

[0040] The frame 1 has two symmetrical fork slots 2, and the center frame 3 is located between the fork slots 2. The bottom of the frame 1 is also equipped with a floating drive wheel 5, a floating driven wheel 6, and a drive auxiliary wheel 7. If the cantilever of the center frame 3 is too long, it will deform and vibrate. An auxiliary support wheel assembly 4 is provided for support.

[0041] The swivel casters 44 directly contact the ground, providing additional support points and allowing for flexible steering. Their vertical elastic floating characteristic is key, enabling them to adapt to ground undulations. The caster mounting plate 43, as the main load-bearing structure, is hinged to the vertical plate 47 at one end, allowing limited swaying of the caster assembly in the vertical plane. The other end is designed with a sliding hole. A limiting screw 48 passes through the sliding hole and connects to the central frame 3 structure. Its function is twofold: firstly, to limit the vertical floating travel of the caster mounting plate 43 (along with the swivel casters 44), and secondly, to act as a guide rod. The compression spring 45, fitted onto the limiting screw 48, is supported at its lower end by the spring mounting plate 46 (fixed to the central frame 3), while its upper end presses against the caster mounting plate 43, providing elastic support and cushioning for the entire floating structure. The spring mounting plate 46 is responsible for securely fixing the lower end of the compression spring 45 to the central frame 3, forming a reliable support base for the spring.

[0042] The caster mounting plate 43 has a beveled section at one end near the compression spring 45. The beveled section bends towards the swivel caster 44, leaving space to accommodate the compression spring 45. As the core load-bearing and force-transmitting component, the caster mounting plate 43 is hinged to the vertical plate 47 at one end, allowing the assembly to swing within a limited vertical plane. Its other end is designed with a unique beveled section that bends towards the swivel caster 44. Its core functions are: 1. To provide space: to provide sufficient space for the compression spring 45, which is fitted onto the limit screw 48, ensuring that the spring can compress and rebound smoothly; 2. To form an inclined support surface: the beveled section contacts the upper end of the compression spring 45, so that the direction of the support force provided by the spring is not completely perpendicular. The horizontal component of the force generated helps to press the swivel caster 44 more stably against the ground, enhancing adhesion and reducing possible lateral swaying. The limiting screw 48 passes through the sliding hole on the caster fixing plate 43. Its core functions are: 1. to limit the vertical floating travel of the caster fixing plate 43 (together with the swivel caster 44); 2. to act as a floating guide rod. The compression spring 45 is fitted onto the limiting screw 48. Its lower end is supported by the spring fixing plate 46 (fixed to the middle frame 3), and its upper end abuts against the inclined section of the caster fixing plate 43, providing elastic support and cushioning for the entire floating structure. Its elastic force is effectively transmitted through the inclined section and converted into support and stability.

[0043] The inclined section has a flat section at its end, and the sliding hole is located on the flat section. The core functions of the flat section at the end of the inclined section are: 1. To provide a flat mounting base: ensuring that the sliding hole can be precisely and stably machined on this plane; 2. To optimize contact and force: providing a flat contact surface and a reliable locking plane for the limit screw 48 and its nut / washer passing through the sliding hole, ensuring that the limit screw 48 is evenly stressed when sliding smoothly in the sliding hole, avoiding stress concentration or installation difficulties caused by the inclined surface; 3. To maintain the stability of the spring's direction of action: allowing the upper end of the compression spring 45 to rest flat against the flat section (or through an intermediate part), ensuring that the spring force acts perpendicularly to the flat section, and the force transmission path is clear. The sliding hole is located on the flat section, and its function is still: 1. To cooperate with the limit screw 48, allowing the caster fixing plate 43 (along with the swivel caster 44) to slide up and down (float) within a limited stroke; 2. To provide precise floating guidance. The limiting screw 48 passes through the sliding hole and is fixed to the middle frame 3 structure (such as the spring fixing plate 46 or bracket). Its core functions are: 1. to limit the floating stroke; 2. to act as a floating guide rod. The compression spring 45 is sleeved on the limiting screw 48. Its upper end acts on the planar section of the caster fixing plate 43 (possibly directly or indirectly), and its lower end is supported by the spring fixing plate 46, which is firmly fixed to the middle frame 3. The compression spring 45 provides elastic support and cushioning. Its elastic force is effectively transmitted through the inclined section and the planar section to achieve support and vibration reduction.

[0044] Combined with appendix Figure 3-4 The auxiliary support wheel assembly 4 is hidden inside the central frame 3, which has openings that allow the swivel casters 44 to protrude. The core functions of the openings are: 1. Providing a passage: ensuring that the swivel casters 44 can extend downwards and contact the ground, fulfilling their core functions of providing additional support points and steering; 2. Limiting dimensions: the dimensions of the openings are precisely designed to ensure the necessary range of motion of the swivel casters 44 (especially the vertical floating travel) while minimizing the opening size to achieve a protective effect. Concealing the entire auxiliary support wheel assembly 4 (including swivel casters 44, caster fixing plates 43, inclined sections, flat sections, sliding holes, hinge points of vertical plates 47, limit screws 48, compression springs 45, and spring fixing plates 46) within the central frame 3 offers several significant advantages: 1. Superior protection: Effectively isolates the assembly from dust, debris, oil, and potential impacts from the external environment, greatly improving the reliability and service life of the assembly; 2. Optimized space layout: The concealed assembly makes the chassis structure more compact and neat, avoiding interference or additional space occupation that may be caused by exposed parts; 3. Enhanced aesthetics and safety: Eliminates safety hazards caused by exposed moving parts (such as the risk of foreign objects being caught or personnel touching them), resulting in a simpler appearance.

[0045] The top of the swivel caster 44 is rotatably connected to the caster mounting plate 43 via a bearing housing 49 and bolts. The bearing housing 49, as a precision component, contains a bearing (such as a ball bearing or needle bearing), greatly reducing the frictional resistance during the rotation of the swivel caster 44, ensuring easy and flexible steering, improving rotational accuracy and load-bearing capacity, and extending service life. The bolts provide a reliable, detachable fastening connection, ensuring that the bearing housing 49 (along with the swivel caster 44) is securely mounted on the caster mounting plate 43, while also facilitating future maintenance or replacement. The caster mounting plate 43, as the core load-bearing and force-transmitting component, is hinged to the vertical plate 47 at one end, allowing the entire assembly to swing in the vertical plane to adapt to road undulations; its other end is designed with a beveled section (providing space for the compression spring 45 and dispersing the spring force) and a flat section (ensuring the accuracy of the sliding hole and providing a flat mounting / force-bearing surface for the limit screw 48). The swivel caster 44, together with its bearing housing 49, forms a single unit, achieving elastic vertical floating through sliding holes guided by and limited by the limit screw 48. A compression spring 45 is fitted onto the limit screw 48, its upper end acting on the flat (or inclined) section of the caster mounting plate 43, and its lower end supported by a spring mounting plate 46 fixed to the center frame 3, providing core elastic support and shock absorption. The entire assembly is concealed within the center frame 3, with the swivel caster 44 only protruding to contact the ground through an opening at the bottom of the center frame 3, achieving excellent protection, space optimization, and safety.

[0046] A bushing is provided at the end of the caster mounting plate 43 away from the compression spring 45. A hinge shaft 42 is fitted onto the bushing, and both ends of the hinge shaft 42 are fixed to the vertical plate 47, which is fixed to the auxiliary support base 41. The core functions of the bushing are: 1. To act as a wear-resistant bushing, providing a smooth, low-friction inner surface; 2. To protect the caster mounting plate 43 body, reducing direct wear with the hinge shaft 42 and extending its service life; 3. To facilitate replacement and maintenance. The hinge shaft 42 is fitted inside the bushing. The key functions of this hinge shaft 42 are: 1. To act as a rigid pivot, precisely passing through the bushing and the two vertical plates 47; 2. To transmit loads: transferring the ground force on the caster mounting plate 43 (and the swivel casters 44 it supports) to the vertical plate 47; 3. To provide a center of rotation: allowing the entire caster mounting plate 43 assembly to rotate and swing freely around its axis (usually the horizontal Y-axis). Both ends of the hinge shaft 42 are fixed to the vertical plate 47 (usually by bolts, snap rings, or interference fits) to ensure its position remains secure. The vertical plate 47 is a key support and mounting base, and its core functions are: 1. to fix the hinge shaft 42, providing a stable and reliable fulcrum for the caster mounting plate 43 assembly; 2. to bear and transmit loads: transferring all forces (support force, impact force) from the hinge shaft 42 to its base; 3. to provide structural strength. The vertical plate 47 is fixed to the auxiliary support base 41, indicating that the auxiliary support base 41 is the final mounting base and load-bearing structure of the entire assembly on the frame 1 middle frame 3. It safely and reliably transmits and distributes all loads from the vertical plate 47 to the main structure of the frame 1 middle frame 3.

[0047] When stationary, the swivel caster 44 is flush with the other wheels of the frame 1. Its core significance lies in: 1. Even load distribution: When stationary, the swivel caster 44 shares the weight of the vehicle with the main wheels, preventing the auxiliary wheels from being suspended (ineffective) or excessively lifting the vehicle body (causing the main wheels to be suspended), ensuring the initial stability of the chassis; 2. Optimized stress distribution: The frame 1 structure (especially the cantilever of the center frame 3) receives pre-support force from the auxiliary support wheels even when stationary, significantly reducing initial deformation; 3. Ensuring smooth operation: During operation, the auxiliary wheels can immediately and without impact participate in support and vibration damping, without needing to overcome gaps or pre-pressure differences. To achieve this precise stationary flush state, the compression spring 45 is pre-compressed during installation. This pre-compression force presses the swivel caster 44 down to a position flush with the other wheels through the caster fixing plate 43 (and its flat section). The engagement of the limiting screw 48 with the sliding hole (located on the planar section), particularly the limiting structure (such as a nut or retaining ring) at the upper (or lower) end of the limiting screw 48, precisely defines the lowest position (i.e., the resting position) of the caster mounting plate 43 (along with the swivel caster 44) under spring preload, ensuring flush alignment. In this state, the inclined section of the caster mounting plate 43 continues to provide space for the compression spring 45. The swivel caster 44 achieves flexible steering connection via the top bearing seat 49 and bolts. The end of the caster mounting plate 43 away from the spring is connected to the vertical plate 47 via a bushing and hinge shaft 42. The vertical plate 47 is fixed to the auxiliary support base 41. This hinge structure allows the auxiliary wheel assembly to swing freely in the vertical plane to adapt to the road surface without affecting the flush height positioning when stationary. The entire component is hidden inside the middle frame 3. The opening at the bottom of the middle frame 3 only allows the swivel casters 44 to protrude and contact the ground. Its size design must ensure that the swivel casters 44 can move freely within the floating stroke, while its wheel rim is on the same horizontal plane as other wheels when stationary.

[0048] The chassis 1 is a one-piece molded structure. Maximizing structural rigidity: It eliminates the inherent connection interfaces (such as welds, bolt holes, and flanges) in traditional multi-component assembled chassis 1, which are often weak points and stress concentration points in structural rigidity. One-piece molding ensures that the main body of chassis 1 (especially key load-bearing areas) has a continuous and uniform material distribution and extremely high section modulus, significantly improving its resistance to bending and torsional deformation from the root. Optimizing force flow transmission: Complex loads generated by vehicle operation and load-bearing (including main wheel drive force, auxiliary support wheel reaction force, cargo load, and impact load) can be transmitted and dispersed within chassis 1 along a more direct and efficient path, greatly reducing the risk of local stress concentration. Improving reliability and lifespan: It avoids common failure modes such as loose connectors and weld fatigue cracking, significantly enhancing overall durability. Ensuring precision and consistency: The one-piece molding process makes it easier to control the dimensions and geometric tolerances of key components (such as the center frame 3), providing a stable and reliable foundation platform for the precise installation and functional operation of the auxiliary support wheel assembly 4.

[0049] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A forklift chassis with auxiliary support, characterized in that, The vehicle includes a frame, which has a center frame located in the middle of the frame. The center frame has an auxiliary support wheel assembly, which includes omnidirectional casters that float vertically and vertically. The omnidirectional casters are rotatably connected to a caster fixing plate. The caster fixing plate is hinged to a vertical plate and has a sliding hole at its other end. The sliding hole is slidably connected to a limit screw. A compression spring is fitted on the limit screw. The compression spring is fixed to the center frame by a spring fixing plate.

2. A latent fork truck chassis with auxiliary support according to claim 1, characterized in that, The caster fixing plate has a beveled section at one end near the compression spring. The beveled section bends toward the swivel caster and leaves space to accommodate the compression spring.

3. A latent fork truck chassis with auxiliary support according to claim 2, characterized in that, The inclined section has a flat section at its end, and the sliding hole is disposed on the flat section.

4. The latent fork truck chassis with auxiliary support according to claim 1, wherein, The auxiliary support wheel assembly is hidden inside the central frame, which has holes that allow the swivel casters to protrude.

5. A forklift chassis with auxiliary support according to claim 4, characterized in that, The top of the swivel caster is rotatably connected to the caster mounting plate via a bearing seat and bolts.

6. A latent fork truck chassis with auxiliary support according to claim 5, characterized in that, The end of the caster fixing plate away from the compression spring is provided with a bushing, and the bushing is fitted with a hinge shaft. The two ends of the hinge shaft are fixed to the vertical plate, and the vertical plate is fixed to the auxiliary support base.

7. The latent fork truck chassis with auxiliary support according to claim 1, wherein, When stationary, the swivel casters are flush with the other wheels of the frame.

8. A forklift chassis with auxiliary support according to any one of claims 1 to 7, characterized in that, The frame is a one-piece molded structure.

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