Stairlift

Abstract

The utility model discloses a stair machine, including stair pedal, first drive mechanism, second drive mechanism and resistance mechanism, first drive mechanism includes two first sprocket and first chain, and first chain is set on two first sprocket, and stair pedal is connected with first chain, second drive mechanism includes second sprocket, third sprocket and second chain, and second chain is set on second sprocket and third sprocket, and second sprocket is coaxial with one first sprocket, and the diameter of third sprocket is less than the diameter of second sprocket, resistance mechanism is connected with third sprocket, the opposite sides of third sprocket are provided with elastic sheet respectively, and elastic sheet is configured to contact with second chain to reduce noise. The scheme can improve the mute performance of stair machine, improve the service life of equipment, and the structure is simple, and the cost is low.

Description

Technical Field

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

[0002] Stair climbers are common fitness equipment that simulates climbing stairs. Their core transmission mechanism typically uses a sprocket and chain system because chain drives offer advantages such as long-distance power transmission, high load-bearing capacity, and relatively low cost. However, chain drives also have inherent drawbacks, one of the most significant being operating noise. The transmission mechanism usually consists of a large sprocket and a small sprocket engaged by a chain. During operation, the engagement of the chain and sprockets (especially the small sprocket with fewer teeth and larger angular velocity variations) is a periodic impact process. The engagement and disengagement of these components generate significant mechanical noise between the chain and sprocket teeth. This noise not only reduces the user experience and can cause disturbance to neighbors in homes and quiet environments, but also accelerates fatigue wear of the chain and sprockets under long-term impact stress, thus reducing transmission accuracy and shortening the equipment's lifespan.

[0003] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0004] In view of the problems pointed out in the background art, this utility model proposes a stair machine that improves the quietness of the stair machine, extends the service life of the equipment, and has a simple structure and low cost.

[0005] To achieve the above-mentioned objectives, the present invention employs the following technical solution: In some embodiments of this application, a staircase machine is provided, comprising: Stair treads, including multiple steps; The first transmission mechanism includes two first sprockets and a first chain, the first chain being sleeved on the two first sprockets, and the stair tread being connected to the first chain; The second transmission mechanism includes a second sprocket, a third sprocket, and a second chain. The second chain is sleeved on the second sprocket and the third sprocket. The second sprocket is coaxially arranged with one of the first sprockets. The diameter of the third sprocket is smaller than the diameter of the second sprocket. A resistance mechanism, which is connected to the third sprocket; The third sprocket has elastic plates on its opposite sides, which are configured to contact the second chain to reduce noise.

[0006] In some embodiments of this application, the diameter of the elastic plate is larger than the root circle diameter of the third sprocket, so that the second chain contacts the elastic plate before touching the root of the third sprocket.

[0007] In some embodiments of this application, the resistance mechanism is connected to the third sprocket via a rotating shaft. The third sprocket includes a third sprocket section and a third sprocket section two. The outer diameter of the third sprocket section one is smaller than the outer diameter of the third sprocket section two. Sprocket teeth are provided on the outer periphery of the third sprocket section two. A first elastic plate is sleeved on the third sprocket section one, and the first elastic plate abuts against one side of the third sprocket section two. A second elastic plate is sleeved on the rotating shaft one, and the second elastic plate abuts against the other opposite side of the third sprocket section two.

[0008] In some embodiments of this application, a first baffle is sleeved on a section of the third sprocket, and the first baffle abuts against the first elastic sheet; a limit locking part is provided at the end of the rotating shaft, and the limit locking part abuts against the first baffle.

[0009] In some embodiments of this application, the limiting locking part includes a second baffle, a washer, and a bolt. The bolt passes through the washer and the second baffle to connect with the rotating shaft. The second baffle abuts against the first baffle and a section of the third sprocket.

[0010] In some embodiments of this application, a retaining ring is sleeved on the rotating shaft, and the retaining ring abuts against the second elastic sheet.

[0011] In some embodiments of this application, the resistance mechanism includes a damper and a reduction mechanism. The reduction mechanism includes a drive wheel and a drive belt. One end of the drive belt is connected to the output shaft of the damper, and the other end of the drive belt is connected to the drive wheel. The drive wheel is connected to the third sprocket via a rotating shaft.

[0012] In some embodiments of this application, the elastic sheet is a rubber sheet.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are: The staircase disclosed in this application includes a first transmission mechanism comprising two first sprockets and a first chain, which is directly connected to multiple stair treads and is used to drive the treads to complete cyclic rotation, ensuring the continuity of the user's stepping action. The second transmission mechanism includes a second sprocket, a third sprocket, and a second chain, which is used to smoothly transmit the motion of the first transmission mechanism to the third sprocket. The third sprocket then connects to a resistance mechanism, allowing the resistance of the resistance mechanism to be transmitted to the stair treads as needed.

[0014] Because the third sprocket has a smaller diameter than the second sprocket, it is a smaller sprocket in the transmission path, resulting in a larger angular velocity variation. This makes it the primary source of noise from the chain-sprocket meshing impact in the second transmission mechanism. Through direct contact between the elastic plate and the second chain, when the second chain engages and disengages with the third sprocket, the elastic plate absorbs the impact energy through its elastic deformation, buffering the rigid impact between the chain and sprocket teeth. This weakens mechanical vibration and impact noise at the source, effectively reducing the operating noise of the second transmission mechanism. Simultaneously, this elastic contact structure does not interfere with the normal connection between the first transmission mechanism and the stair treads, ensuring a significant reduction in overall equipment noise when users exercise on the stair treads. This improves user comfort and avoids noise disturbances caused by the equipment in quiet environments such as homes and apartments.

[0015] The elastic plate's buffering effect on meshing impact directly reduces the impact stress between the second chain and the third sprocket, as well as between the second sprocket and the chain, preventing excessive wear of the chain and sprocket teeth under high-frequency rigid impact and delaying fatigue damage to components. The design of the second sprocket diameter being larger than the first sprocket and the third sprocket diameter being smaller than the second sprocket in the second transmission mechanism creates a reasonable transmission ratio distribution, making the transmission load of the first transmission mechanism more stable. The meshing force between the first chain and the first sprocket can be transmitted to the second transmission mechanism via the coaxially arranged second sprocket, and then to the resistance mechanism via the third sprocket, avoiding localized excessive wear caused by load concentration in a single transmission link.

[0016] Other features and advantages of this utility model will become clearer after reading the detailed embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of a stair machine according to some embodiments; Figure 2 for Figure 1 Enlarged view of section A in the middle; Figure 3 for Figure 3 An exploded view; Figure 4 for Figure 3 A sectional view.

[0019] Figure label: 100. Stair treads; 200. First transmission mechanism; 210. First sprocket; 220. First chain; 300. Second transmission mechanism; 310. Second sprocket; 320. Third sprocket; 321. First section of third sprocket; 322. Second section of third sprocket; 323. Sprocket tooth; 330. Second chain; 400. Resistance mechanism; 410. Damper; 420. Reduction mechanism; 421. Drive wheel; 422. Drive belt; 423. Shaft; 500, Elastic sheet; 510, First elastic sheet; 520, Second elastic sheet; 610. Retaining ring; 620. First baffle; 630. Limiting and locking part; 631. Second baffle; 632. Washer; 633. Bolt. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 application 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 application.

[0022] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] 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.

[0025] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0026] In some embodiments of this application, a staircase machine is provided, as described below. Figures 1 to 4 It includes stair treads 100. The stair treads 100 include multiple steps arranged vertically. During the user's stepping, the multiple steps of the stair treads 100 rotate in a cycle to help the user complete the fitness exercise.

[0027] The stair machine also includes a first transmission mechanism 200. The first transmission mechanism 200 includes two first sprockets 210 and a first chain 220. The first chain 220 is sleeved on the two first sprockets 210, and the stair tread 100 is connected to the first chain 220.

[0028] The stair machine also includes a second transmission mechanism 300. The second transmission mechanism 300 includes a second sprocket 310, a third sprocket 320, and a second chain 330. The second chain 330 is sleeved on the second sprocket 310 and the third sprocket 320. The second sprocket 310 is coaxially arranged with one of the first sprockets 210. The diameter of the third sprocket 320 is smaller than the diameter of the second sprocket 310, and the diameter of the second sprocket 310 is larger than the diameter of the first sprocket 210.

[0029] The stair machine also includes a resistance mechanism 400. The resistance mechanism 400 is connected to the third sprocket 320. The resistance mechanism 400 is used to provide resistance to the stair treads 100.

[0030] Among them, elastic plates 500 are respectively provided on opposite sides of the third sprocket 320. The elastic plates 500 are configured to contact the second chain 330 to reduce noise.

[0031] When the stair machine is working, a person steps on the stair tread 100, and the stair tread 100 moves downward under the action of the person's weight; the first sprocket 210 drives the second sprocket 310 to rotate through the first chain 220, the second sprocket 310 drives the third sprocket 320 to rotate through the second chain 330, and the third sprocket 320 drives the resistance mechanism 400 to rotate; the resistance mechanism 400 provides a certain resistance, so that the human body moves at an appropriate speed.

[0032] The first transmission mechanism 200 includes two first sprockets 210 and a first chain 220, which are directly connected to the multi-step stair treads 100. It is used to drive the treads to complete cyclic rotation, ensuring the continuity of the user's stepping action. The second transmission mechanism 300 includes a second sprocket 310, a third sprocket 320, and a second chain 330. It is used to smoothly transmit the motion of the first transmission mechanism 200 to the third sprocket 320, and then, through the connection of the third sprocket 320 to the resistance mechanism 400, the resistance of the resistance mechanism 400 can be transmitted to the stair treads 100 as needed.

[0033] Because the diameter of the third sprocket 320 is smaller than that of the second sprocket 310, as a smaller sprocket in the transmission path, its angular velocity changes more significantly, making it the main source of noise from the chain-sprocket meshing impact in the second transmission mechanism 300. Through the direct contact between the elastic plate 500 and the second chain 330, when the second chain 330 engages and disengages from the third sprocket 320, the elastic plate 500 can absorb the impact energy through its own elastic deformation, buffering the rigid impact between the chain and the sprocket teeth 323. This weakens mechanical vibration and impact noise at the source of noise generation, effectively reducing the operating noise of the second transmission mechanism 300. Simultaneously, this elastic contact structure does not interfere with the normal connection between the first transmission mechanism 200 and the stair tread 100, ensuring that the overall noise level of the equipment is significantly reduced when the user is exercising on the stair tread 100. This improves user comfort and avoids noise disturbances caused by the equipment in quiet environments such as homes and apartments.

[0034] The elastic plate 500 buffers the meshing impact, directly reducing the impact stress between the second chain 330 and the third sprocket 320 and the second sprocket 310, preventing excessive wear of the chain and sprocket teeth 323 under high-frequency rigid impact, and delaying fatigue damage to the components. The design of the second sprocket 310 in the second transmission mechanism 300, with a diameter larger than the first sprocket 210 and a diameter smaller than the third sprocket 320, creates a reasonable transmission ratio distribution, making the transmission load of the first transmission mechanism 200 more stable. The meshing force between the first chain 220 and the first sprocket 210 can be transmitted to the second transmission mechanism 300 through the coaxially arranged second sprocket 310, and then to the resistance mechanism 400 via the third sprocket 320, avoiding localized excessive wear caused by load concentration in a single transmission link.

[0035] The proposed solution can maintain the meshing accuracy of the first transmission mechanism 200 and the second transmission mechanism 300 for a long time, ensuring the stability of the cyclic rotation of the stair tread 100 and avoiding tread jamming or uneven operation due to decreased transmission accuracy. It can also extend the service life of core transmission components such as the chain, the first sprocket 210, the second sprocket 310, and the third sprocket 320, as well as the entire machine, reducing the user's equipment maintenance and replacement costs.

[0036] In some embodiments of this application, the elastic sheet 500 is a rubber sheet. The rubber sheet can be made of materials such as nitrile rubber, EPDM rubber, or natural rubber, balancing elastic cushioning and structural strength.

[0037] As the link of the second chain 330 is about to engage with the tooth groove of the third sprocket 320, the outer chain plate of the second chain 330 first contacts the rubber sheet on the side of the third sprocket 320. The rubber sheet undergoes elastic deformation under the squeezing force of the second chain 330. This deformation can dissipate some of the impact kinetic energy of the second chain 330 towards the sprocket tooth groove 323 in advance, avoiding a rigid collision between the second chain 330 and the sprocket tooth 323.

[0038] After the second chain 330 is fully inserted into the sprocket tooth 323 groove, the rubber sheet remains in contact with the outer chain plate. Its continuous elastic tension can disperse the meshing force between the second chain 330 and the sprocket tooth 323 to the contact area of ​​the second chain 330, rather than concentrating it on the tooth tip or tooth root of the sprocket tooth 323, thereby reducing the local stress concentration on the surface of the sprocket tooth 323.

[0039] When the second chain 330 disengages from the tooth groove of the third sprocket 320, the rubber sheet can return to its original position through its own elasticity, preventing the second chain 330 from swinging due to inertia or rubbing against the surface of the sprocket teeth 323. In traditional structures without rubber sheets, the second chain 330 is prone to producing a "clicking" sound due to sudden changes in angular velocity when disengaging, while the rubber sheet can reduce this disengagement noise.

[0040] During long-term operation of the stairwell machine, the rubber sheet can adapt to the dynamic changes of the chain drive through its material properties, avoiding negative impacts on transmission accuracy. Specifically, due to the polygonal effect of the chain drive, the second chain 330 will produce slight radial runout during transmission. The elasticity of the rubber sheet can adapt to this runout. When the second chain 330 moves closer to the third sprocket 320, the rubber sheet is compressed; when the second chain 330 moves away, the rubber sheet naturally rebounds, always maintaining flexible contact with the second chain 330. This neither restricts the normal runout of the second chain 330 nor suppresses the vibration noise caused by the runout through contact damping.

[0041] The rubber sheet has a lower material hardness than the second chain 330. When it comes into contact with the second chain 330, it only generates flexible friction and will not scratch or wear the outer chain plate or rollers of the second chain 330. At the same time, a wear-resistant coating can be added to the surface of the rubber sheet to prevent the rubber itself from shedding debris due to long-term friction.

[0042] In some embodiments of this application, the diameter of the elastic sheet 500 is slightly larger than the root diameter of the third sprocket 320, so that the second chain 330 contacts the elastic sheet 500 before touching the root of the third sprocket 320.

[0043] As the second chain 330 approaches the third sprocket 320, it first contacts the outer edge of the elastic plate 500. The elastic plate 500 undergoes elastic deformation under the radial pressure of the second chain 330. This deformation process gradually absorbs the kinetic energy of the second chain 330, causing its speed to smoothly decrease from free transmission speed to a speed suitable for tooth root engagement. When the elastic plate 500 deforms to its limit, the second chain 330 just reaches the tooth root of the third sprocket 320. At this point, the relative speed difference between the second chain 330 and the tooth root has significantly decreased, the impact force is weakened, and consequently, the mechanical noise at the moment of engagement is reduced.

[0044] In traditional structures, when the second chain 330 impacts the tooth root, the impact force acts directly on the tooth root, causing the tooth root to bear a large impact stress instantaneously. In this design, however, the second chain 330 first contacts the elastic plate 500. The impact force is first dispersed and transmitted to both axial sides of the third sprocket 320 through the deformation of the elastic plate 500. This allows the impact stress to be absorbed by the elastic plate 500 first, and the remaining stress is then converted into a stable contact stress when transmitted to the tooth root. Through the stepwise transmission and buffering of stress, fatigue damage to the tooth root of the third sprocket 320 due to long-term high-frequency impact can be avoided.

[0045] The elastic plate 500 is a circular sheet structure with a smooth, rounded outer edge. When the second chain 330 becomes misaligned due to radial runout, it first contacts the rounded edge of the elastic plate 500. The flexibility of the elastic plate 500 can correct the misalignment angle of the second chain 330 through slight deformation, allowing the second chain 330 to gradually conform to the meshing plane of the third sprocket 320 and guide the second chain 330 to accurately enter the tooth groove. At the same time, the symmetrical arrangement of the elastic plates 500 ensures that the force on both sides of the second chain 330 is balanced, avoiding uneven wear on one side.

[0046] The elastic plate 500 helps to improve the meshing overlap between the second chain 330 and the third sprocket 320, avoiding transmission jamming caused by meshing misalignment.

[0047] In some embodiments of this application, the resistance mechanism 400 is connected to the third sprocket 320 via a rotating shaft 423. The third sprocket 320 includes a third sprocket section 321 and a third sprocket section 322, which are integrally structured. The outer diameter of the third sprocket section 321 is smaller than the outer diameter of the third sprocket section 322. Sprocket teeth 323 are provided on the outer periphery of the third sprocket section 322.

[0048] A first elastic plate 510 is fitted onto the first section 321 of the third sprocket, and the first elastic plate 510 is in contact with one side of the second section 322 of the third sprocket. A second elastic plate 520 is fitted onto the rotating shaft 423, and the second elastic plate 520 is in contact with the other opposite side of the second section 322 of the third sprocket.

[0049] The first elastic plate 510 is sleeved on the first section 321 of the third sprocket, and abuts against one side of the second section 322 of the third sprocket; the second elastic plate 520 is sleeved on the rotating shaft 423, and abuts against the other side of the second section 322 of the third sprocket. During installation, by controlling the thickness of the first elastic plate 510 and the second elastic plate 520, the two elastic plates 500 form a slight preload on the second section 322 of the third sprocket, axially fixing the second section 322 of the third sprocket between the two elastic plates 500, thus eliminating the axial clearance between the rotating shaft 423 and the mating hole of the third sprocket 320.

[0050] When the stair machine is running, the second chain 330 meshes with the second section 322 of the third sprocket, generating an axial impact force. If the second section 322 of the third sprocket tends to move to the left, it will squeeze the second elastic plate 520. The second elastic plate 520 generates a reverse elastic force through elastic deformation to prevent the movement. If it tends to move to the right, it will squeeze the first elastic plate 510, which similarly generates a reverse elastic force. The two elastic plates 500 can suppress the axial displacement of the third sprocket 320 in real time, keeping the third sprocket 320 always in the preset meshing position, avoiding scraping between the teeth and the chain due to movement, and preventing uneven wear of the teeth on one side.

[0051] In some embodiments of this application, a first baffle 620 is fitted onto a section 321 of the third sprocket, and the first baffle 620 abuts against the first elastic piece 510. A limiting locking part 630 is provided at the end of the rotating shaft 423, and the limiting locking part 630 abuts against the first baffle 620. The first baffle 620 and the limiting locking part 630 reliably limit the first elastic piece 510, resulting in a reliable structure.

[0052] In some embodiments of this application, the limiting locking part 630 includes a second baffle 631, a washer 632, and a bolt 633. The bolt 633 passes through the washer 632 and the second baffle 631 to connect with the rotating shaft 423. The second baffle 631 abuts against the first baffle 620 and the first section 321 of the third sprocket. The limiting locking part 630 has a simple and compact structure and is easy to assemble and disassemble.

[0053] In some embodiments of this application, a retaining ring 610 is sleeved on the rotating shaft 423. The retaining ring 610 abuts against the second elastic sheet 520, and the retaining ring 610 limits the second elastic sheet 520, thereby restricting the axial displacement of the second elastic sheet 520.

[0054] In some embodiments of this application, the resistance mechanism 400 includes a damper 410 and a reduction mechanism 420. The reduction mechanism 420 includes a drive wheel 421 and a drive belt 422. One end of the drive belt 422 is connected to the output shaft of the damper 410, and the other end of the drive belt 422 is connected to the drive wheel 421. The drive wheel 421 is connected to the third sprocket 320 through a rotating shaft 423.

[0055] When in use, the user steps on the stair tread 100, which moves step by step under the transmission of the first sprocket 210 and the first chain 220. The damper 410 provides resistance to the stair tread 100 through the second transmission mechanism 300. The deceleration mechanism 420 ensures that the resistance provided by the damper 410 is stably transmitted to the second transmission mechanism 300, which can prevent the resistance from suddenly disappearing and the stair tread 100 from slipping down quickly and causing the user to fall, thus improving the safety of the user.

[0056] Compared to other resistance devices, the damper 410 exhibits less vibration and noise, thus improving the stability of the stair machine. The second transmission mechanism 300, damper 410, and reduction mechanism 420 are all located on the side of the first transmission mechanism 200 away from the stair tread 100, which facilitates installation and subsequent maintenance.

[0057] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0058] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A staircase machine, characterized in that, Including: Stair treads, including multiple steps; The first transmission mechanism includes two first sprockets and a first chain, the first chain being sleeved on the two first sprockets, and the stair tread being connected to the first chain; The second transmission mechanism includes a second sprocket, a third sprocket, and a second chain. The second chain is sleeved on the second sprocket and the third sprocket. The second sprocket is coaxially arranged with one of the first sprockets. The diameter of the third sprocket is smaller than the diameter of the second sprocket. A resistance mechanism, which is connected to the third sprocket; The third sprocket has elastic plates on its opposite sides, which are configured to contact the second chain to reduce noise.

2. The staircase machine according to claim 1, characterized in that, The diameter of the elastic plate is larger than the root circle diameter of the third sprocket, so that the second chain contacts the elastic plate before touching the root of the third sprocket.

3. The staircase machine according to claim 1, characterized in that, The resistance mechanism is connected to the third sprocket via a rotating shaft. The third sprocket includes a third sprocket section 1 and a third sprocket section 2. The outer diameter of the third sprocket section 1 is smaller than the outer diameter of the third sprocket section 2. Sprocket teeth are provided on the outer periphery of the third sprocket section 2. A first elastic plate is fitted on one section of the third sprocket, and the first elastic plate is in contact with one side of the second section of the third sprocket. A second elastic plate is sleeved on the shaft, and the second elastic plate is in contact with the other opposite side of the second section of the third sprocket.

4. The staircase machine according to claim 3, characterized in that, A first baffle is fitted onto one section of the third sprocket, and the first baffle abuts against the first elastic sheet. The end of the rotating shaft is provided with a limit locking part, which abuts against the first baffle.

5. The staircase machine according to claim 4, characterized in that, The limiting and locking part includes a second baffle, a washer, and a bolt. The bolt passes through the washer and the second baffle to connect with the rotating shaft. The second baffle abuts against the first baffle and a section of the third sprocket.

6. The staircase machine according to claim 3, characterized in that, A retaining ring is fitted on the rotating shaft, and the retaining ring abuts against the second elastic sheet.

7. The staircase machine according to any one of claims 1 to 6, characterized in that, The resistance mechanism includes a damper and a reduction mechanism. The reduction mechanism includes a drive wheel and a drive belt. One end of the drive belt is connected to the output shaft of the damper, and the other end of the drive belt is connected to the drive wheel. The drive wheel is connected to the third sprocket via a rotating shaft.

8. The staircase machine according to any one of claims 1 to 6, characterized in that, The elastic sheet is a rubber sheet.

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