A foldable treadmill

Abstract

The utility model relates to the technical field of body -building apparatus, especially a collapsible treadmill, including base frame, treadmill body, lift frame and air pressure stick subassembly, treadmill body and lift frame hinged connection, lift frame and the front end hinge of base frame, lift frame front end installs front roller, and the rear end of base frame is installed with rear roller, when the folding of treadmill body drives lift frame to tilt and press down front roller and raise the front end of base frame, when the folding of treadmill body reaches the highest position, and front roller and rear roller contact ground simultaneously and constitute the sliding structure. This scheme has the advantages of convenient movement after folding and stable use after unfolding.

Description

Technical Field

[0001] This utility model relates to the field of fitness equipment technology, and in particular to a foldable treadmill. Background Technology

[0002] As a mainstream choice for modern home fitness, folding treadmills need to balance space utilization and ease of use in their design. Traditional folding mechanisms mainly suffer from two major technical bottlenecks: First, there is the issue of mobility after folding. Existing solutions mostly use a fixed base design. When the overall center of gravity shifts upward after folding, users need to completely lift the heavy machine to move it, which poses a great difficulty for transporting large models. Second, there is a contradiction in the reliability of function switching. Some improved products have tried to add casters to the base, but if the casters are not completely off the ground when unfolded, it will cause the machine to wobble, posing a safety hazard. On the other hand, if a suspended design is adopted, the folding and mobility function is lost.

[0003] While Chinese patent CN212679954U improves load-bearing capacity through a parallel dual-support structure of gas springs and telescopic rods, it fails to resolve the aforementioned core contradiction. In this design, the base remains fixed, requiring the treadmill to be lifted off the ground for movement even after folding. Some existing improvements attempt to add casters to the base, but if the casters touch the ground during unfolding, the treadmill will wobble, affecting safety. Furthermore, the caster system cannot intelligently switch between the unfolded state and the stabilizing support. This structural flaw forces users to make trade-offs between the unfolded state and the mobility function, limiting the product's applicability and increasing usage risks.

[0004] The industry urgently needs a folding mechanism that can automatically coordinate the contact state of the rollers and the stability of the support, so as to ensure the safety of use when unfolded and to enable easy movement when folded. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide a foldable treadmill that is convenient to move when folded and stable when unfolded.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This application provides a foldable treadmill, the technical solution of which is as follows: The foldable treadmill includes a base frame, a treadmill body, a lifting frame, and a pneumatic rod assembly; characterized in that: the treadmill body is hinged to the lifting frame, and the lifting frame is hinged to the front end of the base frame; a front roller is installed at the front end of the lifting frame, and a rear roller is installed at the rear end of the base frame; when the treadmill body is folded, the lifting frame tilts down to press down the front roller and raises the front end of the base frame; when the treadmill body is folded to its highest position, the front roller and the rear roller simultaneously contact the ground to form a sliding structure.

[0008] This technical solution achieves intelligent switching of movement states through a multi-stage hinge structure and roller linkage mechanism. The treadmill body is hinged to the lifting frame, which in turn is hinged to the front end of the base frame, forming a three-stage rotating joint. This allows the lifting frame to change its tilt angle during folding. Through the cooperation of the front roller mounted on the front end of the lifting frame and the rear roller at the rear end of the base frame, the machine's own weight drives the lifting frame to tilt during folding, forcing the front roller to press down to the ground and simultaneously lifting the front end of the base frame. At this point, the front and rear rollers form a double-wheel supported sliding structure, enabling movement in the folded state. In the unfolded state, the machine body lowers, causing the lifting frame to return to its original position, and the front roller naturally lifts off the ground, with stability ensured only by the rigid support of the base frame. This design automatically switches the roller's working state through mechanical linkage, achieving both ease of movement and operational stability without manual operation.

[0009] Furthermore, this application proposes a lifting device connecting the front end of the treadmill body to the lifting frame, used to drive the treadmill body to rotate and rise relative to the lifting frame. This technical solution achieves active control of the treadmill body angle by setting a lifting device between the front end of the treadmill body and the lifting frame. The lifting device, as a drive mechanism, acts directly on the connection point between the treadmill body and the lifting frame, applying a driving force to cause the front end of the treadmill body to rotate and rise relative to the lifting frame around the hinge point. This design allows the treadmill to adjust its tilt angle based on the lifting device during use, thereby adjusting the running intensity. Furthermore, when the treadmill needs to be folded, the lifting frame and the treadmill body are linked, the treadmill body is raised to a preset height, which in turn causes the lifting frame to tilt and press down on the front rollers. Simultaneously, the front end of the base frame is raised, forming a sliding structure where the front and rear rollers both contact the ground.

[0010] Furthermore, this application proposes that a foot pad be provided at the lower end of the base frame; when the treadmill is at rest, the lower surface of the foot pad is flush with the lower surface of the rear rollers; lifting one end of the base frame allows the foot pad to leave the ground, and the treadmill can be moved via the rear rollers. This technical solution constructs an intelligent switching mechanism between two working states through the coordinated layout of the foot pad and the rear rollers. The foot pad at the lower end of the base frame, when the treadmill is at rest, ensures that the lower surface of the foot pad is flush with the lower surface of the rear rollers, allowing both the foot pad and the rear rollers to contact the ground together, forming multi-point support. In this state, the foot pad bears the main load, thus ensuring operational stability in the unfolded state. When movement is required, lifting one end of the base frame lifts the foot pad off the ground, at which point only the rear rollers contact the ground, and the entire machine is moved using the rolling characteristics of the rollers. The key to this structural design lies in the spatial matching relationship between the foot pads and the rear rollers. This ensures that the foot pads make priority contact with the ground for stable support when the wheels are in the unfolded state, and can quickly switch to the roller-bearing state through a simple lifting action when movement is required. This fundamentally solves the technical contradictions in traditional solutions where the rollers are constantly on the ground, resulting in poor stability, or are completely suspended in the air, leading to difficulty in movement.

[0011] Furthermore, this application proposes that the rear end of the treadmill body is provided with a rear support leg, and when the treadmill is placed flat, the lower end surface of the rear support leg is flush with the lower end surface of the foot pad. This solution achieves stable support through the cooperation of the rear support leg and the foot pad.

[0012] Furthermore, this application proposes that a transport wheel be provided at the front end of the base frame; when the treadmill is placed flat, the transport wheel works in conjunction with the rear roller to move the treadmill. This technical solution optimizes the treadmill's movement function by adding a transport wheel at the front end of the base frame, forming a double-wheel support structure with the rear roller. Specifically, when the treadmill is placed flat, the transport wheel at the front end of the base frame forms a symmetrical roller layout with the rear roller at the rear end of the base frame. When the treadmill needs to be moved, the transport wheel and the rear roller both contact the ground, forming a stable two-point rolling support, allowing the user to perform a horizontal movement without completely lifting the treadmill off the ground.

[0013] Furthermore, this application proposes that at least one of the transport wheel and the rear roller is equipped with a switchable wheel lock mechanism, which secures or releases the transport wheel and the rear roller via a latch. This technical solution achieves manual control of the roller status by setting a switchable wheel lock mechanism. Specifically, at least one of the transport wheel or the rear roller is equipped with a wheel lock mechanism, allowing the user to choose to lock or release a specific roller according to the usage scenario. When the treadmill is in the unfolded state, the wheel lock mechanism is secured by the latch, which forces the corresponding roller to remain stationary, preventing the machine from shaking due to the roller contacting the ground; when it is necessary to move the treadmill, releasing the latch allows the roller to resume its rolling function, thus balancing stability and ease of movement.

[0014] Furthermore, this application proposes an auxiliary lifting pneumatic rod assembly between the treadmill body and the base frame, which locks when the treadmill body is folded to its highest position. This technical solution achieves dual safety assurance in the folded state through the synergistic action of the pneumatic rod assembly and the locking mechanism. As an auxiliary lifting device, the pneumatic rod assembly provides cushioning force during folding through the extension and retraction of the internal piston rod, reducing the effort required for the user to manually lift the machine. When the treadmill body is folded to its highest position, a mechanical interlock is formed, completely eliminating the risk of springback caused by changes in internal pressure. This design, which automatically switches to rigid support at the end of the fold, retains the assistive function of the pneumatic rod during the lifting phase while ensuring the absolute stability of the overall structure during movement through physical locking.

[0015] Furthermore, this application proposes that the pneumatic rod assembly includes a pneumatic rod hinged to the base frame, a locking block disposed at the upper end of the pneumatic rod, and a piston rod passing through the locking block and slidably disposed within the pneumatic rod; the pneumatic rod and the positioning bushing are hinged to the treadmill body, and the pneumatic rod and the locking block are located within the positioning bushing; when the treadmill body is folded to its highest position, the treadmill body applies lateral pressure to the positioning bushing, causing the lower end of the positioning bushing to engage and lock onto the locking block. This technical solution achieves mechanical locking in the folded state through the structural innovation of the pneumatic rod assembly. The hinged design of the pneumatic rod and the base frame allows it to change angle with the folding action, while the hinged relationship between the positioning bushing and the treadmill body ensures the synchronization of their movement trajectories. When folded to its highest position, the lateral pressure applied by the treadmill body forces the lower end of the positioning bushing to engage with the locking block. During this process, the axial sliding of the positioning bushing is converted into radial displacement, and self-locking is achieved through the concave-convex fit between the locking block and the bushing notch. The telescopic characteristics of the internal piston rod of the pneumatic rod provide cushioning during the folding process, while the pneumatic rod and the positioning bushing ensure even force distribution, preventing locking failure due to uneven loading. The matching design of the limiting protrusion on the latch block and the notch on the positioning bushing further enhances the stability of the locked state, ensuring that the pneumatic rod assembly will not be accidentally unlocked during transportation.

[0016] When unfolding the treadmill, gently lift the rear of the treadmill body, then push the positioning bushing to the left with your foot or hand to unlock the positioning bushing from the buckle block. The treadmill body will then slowly descend until it is level.

[0017] Furthermore, this application proposes that a limiting protrusion be provided on the upper edge of the latching block, and a notch be provided at the lower end of the positioning sleeve. When the treadmill body is folded to its highest position, the positioning sleeve is subjected to lateral pressure, and the side wall of the notch engages with the inner side of the limiting protrusion of the latching block to achieve locking. This technical solution innovatively achieves mechanical self-locking in the folded state through the cooperation structure of the limiting protrusion and the notch. The limiting protrusion on the latching block and the notch at the lower end of the positioning sleeve form a complementary shape. When folded to the correct position, the lateral pressure forces the positioning sleeve to undergo a slight deformation, and the side wall of the notch embeds into the inner side of the limiting protrusion to form an interference fit. This design utilizes both the deformation characteristics generated by the force on the pneumatic rod assembly itself and the physical stop formed by the spatial interference between the protrusion and the notch, ensuring the irreversible locking state under the dual action. The limiting protrusion is located on the edge of the latching block rather than in the center, so that the positioning bushing can be guided by the inclined surface of the notch sidewall to accurately engage in the locking position when under pressure; the notch is designed at the lower end of the bushing rather than other parts, which makes full use of the stress concentration area of ​​the contact surface between the bushing and the latching block when folding, and automatically associates the locking action with the end point of the folding stroke.

[0018] Furthermore, this application also proposes that the piston rod and the positioning bushing be concentrically arranged.

[0019] As can be seen from the above, the foldable treadmill and its lifting frame, pneumatic rod assembly and roller mechanism provided in this application, through the linkage design of the hinge structure and rollers, automatically switch the roller contact state when folding and ensure stable support when unfolded, and have the advantages of convenient movement after folding and stable use when unfolded. Attached Figure Description

[0020] Figure 1 This is a side view of a treadmill in its unfolded state, as provided in this application.

[0021] Figure 2 This is a side view of a treadmill in a folded state, as provided in this application.

[0022] Figure 3 This is a three-dimensional schematic diagram of a treadmill in a folded state, as provided in this application.

[0023] Figure 4 This is a cross-sectional view of a treadmill in a folded state, as provided in this application.

[0024] Figure 5 for Figure 4 Enlarged view of part A. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In existing technologies, folding treadmills face a dilemma in home environments: difficulty in moving them after folding and in maintaining stability when unfolded. Traditional solutions increase strength by adding support structures, but the increased overall height after folding necessitates fully lifting the machine for transport, which is particularly inconvenient for larger models. Some improvements attempt to add casters to the base, but the casters touching the ground when unfolded cause wobbling, while the suspended design prevents folding and moving functionality. This contradiction limits the product's practicality and user experience.

[0031] To solve the above problems, the inventors discovered that the key lies in achieving automatic switching of the roller's working state. By analyzing the motion trajectory of each component during the folding process, they proposed a mechanical linkage mechanism that uses the folding action of the machine body to drive changes in the angle of the lifting frame, thereby controlling the roller's contact with the ground. Based on this concept, a multi-stage hinged structure was designed to form a motion transmission chain, so that the folding action naturally triggers the front roller to press down and the front end of the base to lift, ultimately forming a dual-wheel sliding structure.

[0032] like Figure 1-5As shown, this embodiment proposes a foldable treadmill, including a base frame 1, a treadmill body 2, a lifting frame 3, and a pneumatic rod assembly 4. The treadmill body 2 is hinged to the lifting frame 3, and the lifting frame 3 is hinged to the front end of the base frame 1. A front roller 31 is installed at the front end of the lifting frame 3, and a rear roller 11 is installed at the rear end of the base frame 1. When the treadmill body 2 is folded, the lifting frame 3 tilts down, pressing down the front roller 31 and raising the front end of the base frame 1. When the treadmill body 2 is folded to its highest position, the front roller 31 and the rear roller 11 simultaneously contact the ground, forming a sliding structure.

[0033] The lifting frame 3 refers to the transitional support structure connecting the treadmill body 2 and the base frame 1. It can be constructed by welding a metal frame, with its front end hinged to the base frame 1 to form a rotating joint, resulting in a change in tilt angle during folding. The front roller 31 is a moving auxiliary component installed at the front of the lifting frame 3, which can be a rubber wheel with bearings fixed by bolts. In the folded state, it contacts the ground to form a moving fulcrum. The rear roller 11 is an auxiliary moving device located at the rear of the base frame 1, maintaining contact with the ground when switching between folded and unfolded states.

[0034] When the folding action is initiated, the treadmill body 2 rotates upward, causing the lifting frame 3 to tilt forward around the hinge point of the base frame 1. During the tilting process, the front roller 31 installed at its front end continuously presses down based on leverage, while simultaneously pushing the front end of the base frame 1 upward. When folded to the highest position, the front roller 31 and the rear roller 11 at the rear end of the base frame 1 form a support at the same height, so that the overall center of gravity of the treadmill is distributed between the two rollers. At this time, the user can push the body of the treadmill to move via the rollers, achieving convenient handling in the folded state. When unfolded for use, the treadmill body 2 lowers, causing the lifting frame 3 to return to its initial angle. The front roller 31 moves backward with the lifting frame 3 and leaves the ground, while the base frame 1 is fully on the ground providing stable support. This solution utilizes the folding action to automatically switch the roller working mode, ensuring stability in the unfolded state while retaining the mobility function in the folded state. Through the above technical solution, this application effectively solves the technical obstacle of needing to lift the body of the treadmill for movement in the folded state, while eliminating the risk of shaking caused by the rollers touching the ground when unfolded for use. During the folding process, the roller state is automatically switched through mechanical linkage, achieving a stable support and convenient movement function without additional operation, which significantly improves the user experience.

[0035] like Figure 2 and 4As shown, the front end of the treadmill body 2 is connected to the lifting frame 3 via a lifting device 5, which drives the treadmill body 2 to rotate and rise relative to the lifting frame 3. The lifting device 5 is the drive mechanism connecting the front end of the treadmill body 2 to the lifting frame 3, and can be implemented using an electric push rod, hydraulic cylinder, or gas spring. Its function is to provide driving force for the lifting and lowering of the treadmill body 2. Rotation and lifting refer to the angle adjustment of the treadmill body 2 around the hinge point with the lifting frame 3. This can be achieved by the drive mechanism outputting linear push or pull force, causing the front end of the treadmill body 2 to produce vertical displacement. This technical solution achieves active control of the angle of the treadmill body 2 through the lifting device 5. As a drive mechanism, the lifting device 5 acts directly on the connection point between the treadmill body 2 and the lifting frame 3, applying driving force to cause the front end of the treadmill body 2 to rotate and rise relative to the lifting frame 3 around the hinge point. This design allows the treadmill to adjust its tilt angle based on the lifting device 5 during use, simulating uphill running at different angles and adjusting the running intensity. Furthermore, when the treadmill needs to be folded, the lifting frame 3 is linked with the treadmill body 2, and the treadmill body 2 is raised to a preset height, which in turn causes the lifting frame 3 to tilt down and press down the front roller 31. At the same time, the front end of the base frame 1 is raised, forming a sliding structure in which the front roller 31 and the rear roller 11 touch the ground together.

[0036] exist Figure 1 and 2 In one embodiment shown in Figure 4, a foot pad 12 is provided at the lower end of the base frame 1. When the treadmill is in place, the lower surface of the foot pad 12 is flush with the lower surface of the rear roller 11. Lifting one end of the base frame 1 allows the foot pad 12 to be off the ground, and the treadmill can be moved by the rear roller 11. The foot pad 12 refers to the supporting component located at the lower end of the base frame 1, which can be made of rubber or plastic, and is used to provide a stable ground contact surface when the treadmill is unfolded. The rear roller 11 refers to the rotatable component installed at the rear end of the base frame 1, which can be made of nylon wheels with bearings, and is used to reduce friction when moving the treadmill. The lower surface of the foot pad 12 being flush with the lower surface of the rear roller 11 means that the lowest points of both are at the same horizontal height, which can be achieved by adjusting the installation position or height adjustment bolts to ensure that the foot pad 12 and the rear roller 11 share the load when the treadmill is unfolded.

[0037] When the treadmill is in the unfolded state, the foot pads 12 and the rear rollers 11 simultaneously contact the ground. The larger contact area of ​​the foot pads 12 effectively distributes pressure, preventing roller wobbling and instability. When the treadmill needs to be moved, the front end of the base frame 1 is lifted, causing the foot pads 12 to tilt and lift off the ground. Only the rear rollers 11 remain in contact with the ground, allowing the entire machine to move using their rolling characteristics. This state transition requires no additional operating mechanism; it is accomplished solely through changes in the spatial position of the physical structure, ensuring stability in the unfolded state while enabling rapid triggering of the movement function. This solution, through the coordinated layout of the foot pads 12 and the rear rollers 11, allows the rollers to share the weight with the foot pads 12 but without pressure when unfolded. During movement, a simple lifting motion switches to a state where the rollers bear the weight alone, fundamentally resolving the conflict between stability and movement functionality. Furthermore, as... Figure 1 and 2 As shown, the treadmill body 2 has a rear support leg 21 at its rear end. When the treadmill is at rest, the lower end of the rear support leg 21 is flush with the lower end of the foot pad 12. This design achieves stable support through the cooperation of the rear support leg 21 and the foot pad 12.

[0038] In another embodiment, this application further proposes that the front end of the base frame 1 is provided with a transport wheel; when the treadmill is placed flat, the transport wheel and the rear roller 11 cooperate to move the treadmill.

[0039] The transport wheel is a rolling component installed at the front end of the base frame 1 to assist in movement, and is rotatably connected to the base frame 1 via an axle. When the treadmill is level, the transport wheel, together with the rear roller 11, forms a support point, enabling the entire machine to move horizontally. The rear roller 11 is a rolling component installed at the rear end of the base frame 1 for movement; it can be implemented using a directional wheel structure and connected to the base frame 1 via a fixed bracket. When the treadmill is level, the rear roller 11 works in conjunction with the transport wheel to allow movement without lifting the treadmill. Specifically, when the treadmill is in a level position, the transport wheel and the rear roller 11 simultaneously contact the ground, forming a double-wheel support structure. At this time, the user does not need to completely lift the treadmill; only a horizontal pushing force is required to move the entire machine via the rolling of the double wheels. This design ensures convenient movement through the intelligent switching of the double-wheel layout.

[0040] In this design, to ensure stability during treadmill use, the use of the transport wheel and rear roller 11 is proposed. This application further proposes that at least one of the transport wheel and rear roller 11 is equipped with a switchable wheel lock mechanism, which secures or releases the transport wheel and rear roller 11 via a latch.

[0041] The transport wheels are rolling components installed at the front of the base frame 1 to assist in movement. When the treadmill is flat, they work with the rear rollers 11 to move the treadmill. In the folded state, they form a sliding structure with the front rollers 31. The switchable wheel lock mechanism is a component that controls the rotation of the rollers through a mechanical locking device. Specifically, it can be implemented using a spring-loaded latch that engages with the wheel axle groove. The wheel axle is fixed or released by external force moving the latch. The buckle is a connecting component used to fix the wheel lock mechanism. Specifically, it can be implemented using an L-shaped hook structure formed by metal stamping. When the hook is engaged with the limiting hole of the wheel lock mechanism, it prevents the wheel from rotating. In detail, when the treadmill is in the unfolded state, the wheel lock mechanism is locked by manually operating the buckle. At this time, the wheel axle of the transport wheels or rear rollers 11 is fixed and cannot rotate, preventing the rollers from contacting the ground and causing the machine to shake. When it is necessary to move the treadmill, the buckle is released from the wheel lock mechanism, allowing the rollers to rotate freely. At this time, the user can push the machine to adjust its position. This solution avoids safety hazards caused by accidental rolling of the rollers when the device is unfolded, while retaining the sliding ability required for movement when folded, by setting a switchable locking function on at least one roller.

[0042] like Figure 4 and 5 As shown, a pneumatic rod assembly 4 for assisting lifting is installed between the treadmill body 2 and the base frame 1, and can lock the pneumatic rod assembly 4 when the treadmill body 2 is folded to its highest position. The pneumatic rod assembly 4 is a lifting auxiliary device that generates cushioning force through air pressure. Specifically, it can be implemented using a structure including a piston rod 42 and a pneumatic cylinder, providing assistance during folding to reduce operational intensity. Locking refers to achieving rigid fixation through mechanical interlocking, triggering automatic engagement when folded to prevent the pneumatic rod from rebounding. Folding to the highest position means that the treadmill body 2 is raised to its maximum angle relative to the base frame 1, which can be achieved through the tilt angle limiting structure of the lifting frame 3. At this time, the front roller 31 and the rear roller 11 simultaneously contact the ground to form a sliding state. Specifically, during the folding process, the pneumatic rod assembly 4 generates cushioning force through the extension and retraction of the internal piston rod 42, assisting the user in lifting the treadmill body 2. When the body reaches the highest position, a mechanical interlock is formed, at which point the rebound force generated by the pressure change inside the pneumatic rod is offset by the rigid structure, ensuring the overall stability of the folded state. This solution replaces pneumatic self-locking with physical locking at the end of the folding process, eliminating the possibility of relative displacement between moving parts, while retaining the assist function during the lifting phase.

[0043] In the specific design, the pneumatic rod assembly 4 includes a pneumatic rod 41 hinged to the base frame 1, a latching block 43 disposed on the upper end of the pneumatic rod 41, and a piston rod 42 passing through the latching block 43 and slidably disposed within the pneumatic rod 41; a positioning bushing 44 is sleeved on the outer side of the piston rod 42, the piston rod 42 and the positioning bushing 44 are concentrically arranged, the pneumatic rod 41 and the positioning bushing 44 are hinged to the treadmill body 2, and the pneumatic rod 41 and the latching block 43 are located within the positioning bushing 44; when the treadmill body 2 is folded to the highest position, the treadmill body 2 applies lateral pressure to the positioning bushing 44, causing the lower end of the positioning bushing 44 to engage and lock onto the latching block 43.

[0044] Among them, the pneumatic rod 41 refers to a pneumatic device that generates damping force through gas compression, specifically a single-rod pneumatic spring. Its hinged design to the base frame 1 allows the pneumatic rod 41 to change angle with the lifting frame 3 during folding. The latch block 43 refers to a metal block with a locking structure, specifically an aluminum alloy component with a protruding structure, which cooperates with the notch 441 of the positioning bushing 44 to form a mechanical lock. The piston rod 42 refers to a telescopic transmission component inside the pneumatic rod 41, specifically a chrome-plated steel rod, which slides inside the pneumatic rod 41 to buffer the impact force of the folding action. The positioning bushing 44 refers to a guide component sleeved on the outside of the piston rod 42, specifically a copper sleeve with a groove on the inner wall, whose lower notch 441 forms a locking structure with the protrusion of the latch block 43.

[0045] Specifically, when the treadmill body 2 is folded to its highest position, the body's own weight is transmitted to the positioning sleeve 44 through the hinge point, subjecting it to lateral pressure. This pressure forces the positioning sleeve 44 to undergo a slight radial displacement, and the side wall of its lower notch 441 is pressed against the inner side of the limiting protrusion 411 of the latch block 43. At this time, the axial sliding freedom of the positioning sleeve 44 is completely restricted, and the relative position of the pneumatic rod 41 and the piston rod 42 is fixed. During unfolding, an external force is applied to the positioning sleeve 44 to release its lateral displacement. After the notch 441 disengages from the limiting protrusion 411, the piston rod 42 regains its axial sliding ability, and the pneumatic rod 41 releases its stored elastic potential energy, allowing the body to descend smoothly.

[0046] In a further embodiment, a limiting protrusion 411 is provided on the upper edge of the latching block 43, and a notch 441 is provided at the lower end of the positioning sleeve 44. When the treadmill body 2 is folded to its highest position, the positioning sleeve 44 is subjected to lateral pressure, and the side wall at the notch 441 engages with the limiting protrusion 411 of the latching block 43 to achieve locking. The limiting protrusion 411 refers to the protruding structure provided on the upper edge of the latching block 43, which can be achieved by metal stamping or injection molding, and is used to prevent displacement of the positioning sleeve 44 in the folded state. The notch 441 refers to the recessed area at the lower end of the positioning sleeve 44, which can be achieved by machining or mold forming, and is used to create spatial interference with the limiting protrusion 411 when folded to the correct position.

[0047] Specifically, when the treadmill body 2 is folded to its highest position, the positioning sleeve 44 is subjected to lateral pressure from the treadmill body 2, causing elastic deformation of the side wall of the positioning sleeve 44. At this time, the side wall of the notch 441 slides along the inclined surface of the limiting protrusion 411 until it is fully embedded inside the limiting protrusion 411. Since the limiting protrusion 411 is located at the edge of the buckle block 43, the side wall of the notch 441 is blocked by both sides of the protrusion during the embedding process, forming a bidirectional constraint. At the same time, the elastic deformation of the positioning sleeve 44 creates contact pressure between the side wall of its notch 441 and the limiting protrusion 411, further enhancing the locking effect.

[0048] 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. In this specification, the illustrative expressions of the above terms 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.

[0049] 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. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A foldable treadmill, comprising a base frame (1), a treadmill body (2), a lifting frame (3), and a pneumatic rod assembly (4); Its features are: - The treadmill body (2) is hinged to the lifting frame (3), and the lifting frame (3) is hinged to the front end of the base frame (1); - The lifting frame (3) is equipped with a front roller (31) at the front end and a rear roller (11) at the rear end of the base frame (1); - When the treadmill body (2) is folded, it causes the lifting frame (3) to tilt down and press down the front roller (31) and raise the front end of the base frame (1); when the treadmill body (2) is folded to the highest position, the front roller (31) and the rear roller (11) simultaneously contact the ground to form a sliding structure.

2. The foldable treadmill according to claim 1, characterized in that: - The front end of the treadmill body (2) is connected to the lifting frame (3) via a lifting device (5) to drive the treadmill body (2) to rotate and rise relative to the lifting frame (3).

3. The foldable treadmill according to claim 1, characterized in that: - A foot pad (12) is provided at the lower end of the base frame (1); when the treadmill is placed flat, the lower end of the foot pad (12) is flush with the lower end of the rear roller (11); lifting one end of the base frame (1) can make the foot pad (12) off the ground and move the treadmill through the rear roller (11).

4. The foldable treadmill according to claim 3, characterized in that: The treadmill body (2) is provided with a rear support foot (21) at the rear end. When the treadmill is placed flat, the lower end of the rear support foot (21) is flush with the lower end of the foot pad (12).

5. The foldable treadmill according to claim 1, characterized in that: - The front end of the base frame (1) is provided with a transport wheel; when the treadmill is placed flat, the transport wheel and the rear roller (11) work together to move the treadmill.

6. The foldable treadmill according to claim 5, characterized in that: - At least one of the transport wheel and the rear roller (11) is provided with a switchable wheel lock mechanism, which can be used to fix or release the transport wheel and the rear roller (11) by means of a buckle.

7. The foldable treadmill according to claim 1, characterized in that: - An auxiliary lifting pneumatic rod assembly (4) is provided between the treadmill body (2) and the base frame (1), and the pneumatic rod assembly (4) can be locked when the treadmill body (2) is folded to the highest position.

8. The foldable treadmill according to claim 7, characterized in that: - The pneumatic rod assembly (4) includes a pneumatic rod (41) hinged to the base frame (1), a snap block (43) disposed at the upper end of the pneumatic rod (41), and a piston rod (42) passing through the snap block (43) and slidably disposed within the pneumatic rod (41). - The piston rod (42) is fitted with a positioning bushing (44) on the outside. The air pressure rod (41) and the positioning bushing (44) are hinged to the treadmill body (2), and the air pressure rod (41) and the buckle block (43) are located inside the positioning bushing (44). - When the treadmill body (2) is folded to the highest position, the treadmill body (2) applies lateral pressure to the positioning bushing (44), causing the lower end of the positioning bushing (44) to engage and lock onto the buckle block (43).

9. The foldable treadmill according to claim 8, characterized in that: - A limiting protrusion (411) is provided on the upper end edge of the buckle block (43), and a notch (441) is provided at the lower end of the positioning bushing (44); - When the treadmill body (2) is folded to the highest position, the positioning bushing (44) is subjected to lateral pressure, and the side wall at its notch (441) is engaged and locked inside the limiting protrusion (411) of the buckle block (43).

10. The foldable treadmill according to claim 8, characterized in that: The piston rod (42) and the positioning bushing (44) are concentrically arranged.

Images