A double-pulley device for a staircase machine

Abstract

This utility model discloses a double-pulley device for a stair climber, relating to the field of fitness equipment and applied to a stair climber. It includes a dual-pulley resistance source with a first drive wheel and a second drive wheel; a first pulley assembly including a first pulley and a first belt, the first belt coupling the first drive wheel to a drive shaft; and a second pulley assembly including a second pulley and a second belt, the second belt coupling the second drive wheel to a drive shaft. The first pulley assembly is configured for high-friction transmission; the second pulley assembly is configured for low-friction transmission, with its friction being less than that of the first pulley assembly. This allows it to provide a buffering damping force to the drive shaft by slipping when the first belt fails. During normal operation, the device operates automatically. However, when the first belt slips off or fails, the friction between the second pulley and the second belt provides sufficient damping force to slow the descent of the stair treads, thus providing a buffering and protective function.

Description

Technical Field

[0001] This utility model relates to the field of fitness equipment technology, and more specifically, to a double pulley device for a stair climber. Background Technology

[0002] Stair climbers, as fitness equipment that simulates mountain climbing, are widely popular in commercial gyms and home fitness centers. Their transmission system is the core component for the normal operation of the equipment. Currently, most stair climber transmission systems on the market use a single-pulley structure or a conventional double-pulley parallel drive structure.

[0003] These existing structures present a significant safety hazard: when the drive belt wears out or ages due to long-term use, or becomes loose or detached due to installation errors or improper user operation, the stair machine's step mechanism will instantly lose resistance from the transmission system. Due to the user's own weight and inertia, the steps will suddenly accelerate downwards, easily causing the user to lose balance and resulting in serious safety accidents such as falls, collisions, and sprains.

[0004] Furthermore, existing structures typically lack timely and intuitive fault indication mechanisms when malfunctions such as belt slippage occur. Users or maintenance personnel may struggle to detect problems immediately, delaying equipment repairs and increasing the safety risk of subsequent users unknowingly continuing to use faulty equipment.

[0005] Therefore, there is an urgent need to develop a new type of staircase machine pulley device. This device can not only provide necessary safety buffers for users when the main drive belt fails, preventing accidents, but also clearly indicate the fault, ensuring the safety and maintainability of the equipment. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a double pulley device for stair jacks, which aims to solve the serious safety risks and untimely fault indications that exist in existing stair jacks when the transmission belt falls off.

[0007] This utility model provides a double-pulley device for a staircase machine, applied to a staircase machine, the device comprising:

[0008] A dual-wheel resistance source, comprising a first drive wheel and a second drive wheel;

[0009] A drive shaft is used to connect to the moving parts of the stair machine;

[0010] The first pulley assembly includes a first pulley and a first belt, wherein the first belt is coupled to the first drive wheel and the drive shaft;

[0011] The second pulley assembly includes a second pulley and a second belt, wherein the second belt is coupled to the second drive wheel and the drive shaft;

[0012] The first pulley assembly is configured in a high-friction drive state to provide primary, essentially slip-free drive during normal operation.

[0013] The second pulley assembly is configured for low-friction drive, with a friction force less than that of the first pulley assembly, so as to provide a buffer damping force to the drive shaft by slippage in the event of failure of the first belt.

[0014] Optionally, the first pulley assembly further includes a clamping device for applying pressure to the first belt to achieve the high-friction transmission state.

[0015] Optionally, the clamping device includes:

[0016] Pressure roller bracket;

[0017] A pressure pulley is rotatably mounted on the pressure pulley bracket and is used to press the first belt;

[0018] The tension adjustment mechanism is used to adjust the position of the pressure roller bracket to change the pressure of the pressure roller on the first belt.

[0019] Optionally, the tension adjustment mechanism includes:

[0020] A hook, one end of which is connected to the pressure roller bracket;

[0021] A pulley tension adjustment cylinder is threadedly connected to the other end of the hook.

[0022] A clamping device is used to fix the position of the pulley tension adjustment cylinder during the adjustment process;

[0023] The relative position of the pulley tension adjustment cylinder to the hook can be changed by rotating the cylinder, thereby pulling the pressure pulley bracket to move.

[0024] Optionally, the dual-wheel resistance source is a dual-wheel hysteresis machine.

[0025] Optionally, the drive shaft is a motor shaft, and the device further includes a motor and a motor bracket, wherein the motor is mounted on the motor bracket and connected to the motor shaft.

[0026] Optionally, friction wheels are provided at both ends of the motor shaft, and the first belt and the second belt are respectively hung on the friction wheels.

[0027] Optionally, a grating is also included, disposed on the outside of the motor bracket, for monitoring the rotational speed of the motor shaft.

[0028] Optionally, the low-friction transmission state of the second pulley assembly is achieved by not providing an independent clamping device, and its belt tension is less than that of the first belt.

[0029] Optionally, the pressure roller is rotatably mounted on a fixed shaft via a built-in bearing; the fixed shaft is fixed to the pressure roller bracket.

[0030] Optionally, the angle between the hook and the fixed shaft is an obtuse angle.

[0031] When the first belt comes off or breaks, the slippage of the second pulley assembly not only provides a buffering damping force, but also serves as a mechanical fault indicator, alerting the user that the equipment has malfunctioned.

[0032] Based on the technical content disclosed in this utility model, the following beneficial effects are achieved:

[0033] Active safety protection function: Through the innovative dual-pulley differential friction design, when the first belt, which bears the main transmission function, accidentally falls off, the second pulley assembly, which is in a preset slippage state, can immediately intervene. It uses the friction between itself and the belt to generate buffer damping, which significantly reduces the falling speed of the user and the step, effectively preventing the user from falling and getting injured due to sudden loss of speed, and providing reliable safety protection for the user.

[0034] Instant fault indication function: Once the first belt comes loose, the main resistance of the stair machine disappears, and the slippage of the second belt pulley assembly will cause abnormal step movement. Users can immediately perceive the equipment malfunction, stop use, and seek repair. This intuitive tactile indication makes it easier for users and maintenance personnel to detect and locate problems in a timely manner, improving equipment maintenance efficiency and subsequent safety.

[0035] High reliability and adjustability: The first pulley assembly ensures stable and reliable transmission through a dedicated clamping device. Meanwhile, the friction force of the second pulley assembly can be set through design or adjustment, allowing the device to flexibly adapt to different models and resistance requirements of stairwell machines, enhancing the equipment's versatility and adaptability.

[0036] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0038] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a double-pulley device for a staircase machine according to this utility model.

[0039] Figure 2 This is a top view of the installation of the double pulley device of this utility model when applied to a staircase machine.

[0040] Figure 3 This is a schematic diagram of the pressing device in the double belt pulley device of this utility model.

[0041] Figure 4 This is a schematic diagram of the motor and related components in the double pulley device of this utility model.

[0042] Figure 5 This is the front view of the double pulley device of this utility model.

[0043] Figure 6 This is a left view of the double pulley device of this utility model.

[0044] Figure 7 This is a top view of the double pulley device of this utility model.

[0045] Figure 8 This is a top view of the double pulley device of this utility model from another angle.

[0046] Explanation of reference numerals in the attached drawings: 100-Double pulley device; 10-First pulley assembly; 20-Second pulley assembly; 30-Double-wheel hysteresis machine; 40-Motor shaft; 50-Motor bracket; 60-Motor; 70-Grate; 80-Drive shaft; 101-First pulley; 102-First belt; 103-Pressure pulley; 104-Pressure pulley bracket; 105-Pulley tension adjustment cylinder; 106-Hook; 107-Hook hole; 108-Fixed shaft; 109-Threaded hole; 110-Clamping device; 200-Stair mechanism; 201-Second pulley; 202-Second belt; 301-First drive wheel; 302-Second drive wheel. Detailed Implementation

[0047] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0048] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0049] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0050] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0051] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0052] Please see Figures 1 to 8 This utility model provides a double-pulley device 100 for a stair climber. This device is installed inside the frame of the stair climber 200 to provide controllable resistance to the stepping motion of the stair climber and ensure safe operation.

[0053] The device 100 includes a dual-wheel hysteresis machine 30, a motor assembly (including a motor 60, a motor bracket 50, and a motor shaft 40), a first pulley assembly 10, and a second pulley assembly 20.

[0054] The dual-wheel hysteresis machine 30 is the main source of resistance. Its housing has a built-in magnetic resistance adjustment mechanism and two independently rotatable drive wheels extending outward, namely the first drive wheel 301 and the second drive wheel 302.

[0055] A drive shaft (80) is used to connect to the moving parts of the stair machine (200);

[0056] The first pulley assembly (10) includes a first pulley (101) and a first belt (102), wherein the first belt (102) is coupled to the first drive wheel (301) and the drive shaft (80);

[0057] The second pulley assembly (20) includes a second pulley (201) and a second belt (202), wherein the second belt (202) is coupled to the second drive wheel (302) and the drive shaft (80);

[0058] The first pulley assembly (10) is configured in a high-friction drive state to provide the main, substantially non-slipping drive during normal operation.

[0059] The second pulley assembly (20) is configured in a low-friction drive state, with a friction force less than that of the first pulley assembly (10), so as to provide a buffer damping force to the drive shaft (80) by slippage in the event of failure of the first belt (102).

[0060] The motor assembly serves as the transmission hub, with the motor 60 mounted on the motor bracket 50 and its motor shaft 40 extending in both directions. The stair machine's step chain (not shown) meshes with the sprocket (not shown) on the motor shaft 40, causing the motor shaft 40 to rotate when the user steps on the step.

[0061] The first pulley assembly 10, as the main transmission assembly, is designed to achieve efficient, slippage-free power transmission. It includes a first pulley 101, a first belt 102, and a crucial clamping device. The first pulley 101 is fixedly mounted on the first drive wheel 301 of the dual-wheel hysteresis machine 30. One end of the first belt 102 passes over the first pulley 101, and the other end passes over one end of the motor shaft 40.

[0062] To ensure that the first belt 102 does not slip, a clamping device is provided. As shown in the specific embodiment... Figure 3 As shown, the clamping device includes a pressure roller 103, which is rotatably mounted on a fixed shaft 108 via a built-in bearing. The fixed shaft 108 is fixed to a pressure roller bracket 104. The pressure roller bracket 104 is mounted on the outside of the motor bracket 50. By adjusting the position of the pressure roller 103, it is pressed tightly against the outside of the first belt 102, thereby greatly increasing the belt wrap angle and normal force, ensuring that under normal operating load, the first belt 102 can stably transmit the rotation of the motor shaft 40 to the first drive wheel 301, where resistance is generated by the hysteresis mechanism.

[0063] The second pulley assembly 20, serving as a safety redundancy and buffer component, is designed to provide protection in the event of main drive failure. It includes a second pulley 201 and a second belt 202. The second pulley 201 is fixedly mounted on the second drive wheel 302 of the dual-wheel hysteresis machine 30. One end of the second belt 202 passes over the second pulley 201, and the other end passes over the other end of the motor shaft 40. Unlike the first pulley assembly, the second pulley assembly does not have a clamping device. Its belt tension is set at a lower level, resulting in significantly less friction between the second pulley 201 and the second belt 202 compared to the first pulley assembly 10.

[0064] like Figure 3 As shown, the tension adjustment mechanism includes a pressure roller 103, a pressure roller bracket 104, a roller tension adjustment cylinder 105, a hook 106, a hook hole 107, a fixed shaft 108, a threaded hole 109, and a clamping device 110.

[0065] The pressure roller 103 is mounted on the fixed shaft 108 and can rotate around the fixed shaft 108 (via a built-in bearing). The fixed shaft 108 is fixedly mounted on the pressure roller bracket 104, which is mounted on the motor bracket 50. The pressure roller bracket 104 is provided with a hook hole 107. One end of the hook 106 is hooked into the hook hole 107, and the other end is provided with a threaded hole. The belt tension adjusting cylinder 105 is connected to the threaded hole 109.

[0066] Working principle of the tension adjustment mechanism: The clamping device 110 is fixedly installed on the motor bracket 50. The clamping device 110 is used to clamp the pulley tension adjustment cylinder 105. When the pulley tension adjustment cylinder 105 is screwed into the threaded hole 109, since the clamping device 110 clamps one end of the pulley tension adjustment cylinder 105, the other end of the pulley tension adjustment cylinder 105 will drive the hook 106 to pull downward to the right, thereby driving the hook 106 of the pressure pulley bracket 104 to move backward and downward. The hook 106 and the fixed shaft 108 are set at an obtuse angle, that is, at this time the fixed shaft 108 moves downward, thereby driving the pressure pulley 103 to move downward (or towards the belt), that is, the pressure pulley 103 presses the belt; that is, the pressure pulley bracket 104 is pulled to move the fixed shaft 108 (and the pressure pulley 103) towards the first belt 102 in the direction of approaching / pressing, which improves the friction of the belt.

[0067] The core of this invention is that the second pulley assembly is configured in a low-friction, slippery transmission state. It operates in sync with the first belt during normal operation, but when the first belt falls off or fails, the friction between the second pulley and the second belt can provide sufficient damping force to slow down the falling speed of the stair treads and play a buffering and protective role.

[0068] Working principle:

[0069] Normal operating state: The user starts the stair machine and steps on the treads. The treads drive the motor shaft 40 to rotate via a chain. The motor shaft 40 drives the first drive wheel 301 of the dual-wheel hysteresis machine 30 to rotate via the high-friction first pulley assembly 10. The hysteresis machine generates a set motion resistance. At this time, the second pulley assembly 20 also rotates in the same direction as the motor shaft 40. Due to its low friction, it basically does not bear the resistance transmission and is in a standby state.

[0070] Belt detachment / failure state: When the first belt 102 fails for any reason (such as aging, breakage, or loosening), the power connection between the motor shaft 40 and the first drive wheel 301 is interrupted. Without the second pulley assembly, the motor shaft 40 would rotate rapidly under the user's weight, causing the steps to stall and fall. However, in this invention, the second pulley assembly 20 immediately comes into play. Although its friction is insufficient to completely lock the steps, the static and sliding friction between the second belt 202 and the second pulley 201 provides a continuous damping torque to the second drive wheel 302 of the dual-wheel hysteresis motor 30. This damping torque effectively slows down the rotational speed of the motor shaft 40, thereby greatly reducing the falling speed of the stair steps, providing a flexible and safe buffer, and buying valuable time for the user to safely leave the equipment or react. At the same time, this "slipping" slow fall is itself a clear fault signal, indicating to the user that the equipment is malfunctioning.

[0071] To further optimize performance, friction wheels can be installed at both ends of the motor shaft 40. This involves knurling or wrapping the belt with a high-friction coefficient material at the belt coupling points to enhance the connection between the belt and the shaft. Additionally, as... Figure 4 As shown, a grating 70 can be installed on the outside of the motor bracket 50 to accurately monitor the rotational speed of the motor shaft 40, thereby enabling more intelligent control and fault diagnosis.

[0072] The core of this invention lies in utilizing two functionally differentiated pulley systems: a high-friction, non-slip main drive system for normal operation, and a low-friction, slippery backup system to provide a safety buffer and fault indication in the event of main system failure. This design cleverly solves the safety pain points in existing technologies, with a simple structure and significant effects.

[0073] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A double-pulley device (100) for a stair climber, applied to a stair climber (200), characterized in that, The device includes: The dual-wheel resistance source (30) has a first drive wheel (301) and a second drive wheel (302); A drive shaft (80) is used to connect to the moving parts of the stair machine (200); The first pulley assembly (10) includes a first pulley (101) and a first belt (102), wherein the first belt (102) is coupled to the first drive wheel (301) and the drive shaft (80); The second pulley assembly (20) includes a second pulley (201) and a second belt (202), wherein the second belt (202) is coupled to the second drive wheel (302) and the drive shaft (80); The first pulley assembly (10) is configured in a high-friction transmission state. The second pulley assembly (20) is configured in a low-friction drive state, with a friction force less than that of the first pulley assembly (10), so as to provide a buffer damping force to the drive shaft (80) by slippage in the event of failure of the first belt (102).

2. The staircase machine double pulley device (100) according to claim 1, characterized in that, The first pulley assembly (10) further includes a clamping device for applying pressure to the first belt (102) to achieve the high-friction transmission state.

3. The staircase machine double pulley device (100) according to claim 2, characterized in that, The clamping device includes: Pressure roller bracket (104); A pressure roller (103) is rotatably mounted on the pressure roller bracket (104) and is used to press the first belt (102); The tension adjustment mechanism is used to adjust the position of the pressure roller bracket (104) to change the pressure of the pressure roller (103) on the first belt (102).

4. The staircase machine double pulley device (100) according to claim 3, characterized in that, The tension adjustment mechanism includes: A hook (106) is attached at one end to the pressure roller bracket (104); The pulley tension adjustment cylinder (105) is threadedly connected to the other end of the hook (106); A clamping device (110) is used to fix the position of the pulley tension adjustment cylinder (105) during the adjustment process; The relative position of the pulley tension adjustment cylinder (105) to the hook (106) can be changed by rotating the pulley tension adjustment cylinder (105), thereby pulling the pressure pulley bracket (104) to move.

5. The staircase machine double pulley device (100) according to claim 1, characterized in that, The dual-wheel resistance source is a dual-wheel hysteresis machine (30).

6. The staircase machine double pulley device (100) according to claim 1, characterized in that, The drive shaft is a motor shaft (40). The device also includes a motor (60) and a motor bracket (50). The motor (60) is mounted on the motor bracket (50) and connected to the motor shaft (40).

7. The staircase machine double pulley device (100) according to claim 6, characterized in that, Friction wheels are provided at both ends of the motor shaft (40), and the first belt (102) and the second belt (202) are respectively hung on the friction wheels.

8. The staircase machine double pulley device (100) according to claim 6, characterized in that, It also includes a grating (70) disposed on the outside of the motor bracket (50) for monitoring the rotational speed of the motor shaft (40).

9. The staircase machine double pulley device (100) according to claim 4, characterized in that, The pressure roller (103) is rotatably mounted on the fixed shaft (108) via a built-in bearing; The fixed shaft (108) is fixed on the pressure roller bracket 104.

10. The staircase machine double pulley device (100) according to claim 9, characterized in that, The angle between the hook (106) and the fixed shaft (108) is an obtuse angle.

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