Curved Treadmill Roller Clutch for One-Way Belt Control
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Solution Overview
Problem
Existing treadmills face challenges in preventing reverse direction movement of looped belts and in coordinating hand placement and foot placement for varying exercise intensity.
Innovation Solution
The design incorporates a one-way device with an inner and outer ring, where the inner ring is fixed to a stationary shaft and the outer ring is coupled to a rotating roller tube, allowing rotation in one direction while preventing rotation in the opposite direction, and includes color-coded hand grip and foot placement positions to facilitate user adjustment for different exercise levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a one-way clutch is installed on the roller assembly to prevent reverse direction movement of the looped belt, then the belt movement control is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a one-way clutch as an intermediary component between the roller tube and the stationary shaft. This mediator allows the system to achieve unidirectional belt movement control without requiring complex mechanical constraints, as the clutch automatically engages or disengages based on rotation direction, simplifying the overall control mechanism while improving reliability.
2Reliability
If the inner ring is fixed to the stationary shaft and the outer ring is coupled to the rotating roller tube, then the one-way rotation control is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent utilizes parameter changes in the one-way device design, specifically in the engagement geometry and clearance specifications between the inner and outer rings. By optimizing these parameters, the device achieves reliable unidirectional rotation control while accommodating reasonable manufacturing tolerances, thus reducing the stringency of manufacturing precision requirements.
3Ease of operation
If color-coded hand grip and foot placement positions are provided, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The patent applies color coding to different hand grip positions on the handlebars and corresponding foot placement zones on the running belt. This visual guidance system improves ease of operation by intuitively indicating proper form and intensity levels for various exercises, while adding minimal complexity through simple color markings rather than complex mechanical or electronic systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively restricts reverse belt movement and enhances user coordination for varying exercise intensities, ensuring safe and effective workout experiences.
Implementation Method 1
The one-way device comprises an inner ring and an outer ring, the inner ring being fixedly coupled to the first shaft not to rotate on the first shaft, the outer ring is fixedly coupled to the roller tube to allow the roller tube to rotate in a first direction around the first shaft and to prevent the roller tube from rotating around the first shaft in a second direction that is opposite to the first direction
Data Source
AI summary
A treadmill has a front or rear set of pulleys and a looped running belt. The pulleys rotate with the movement of the belt, e.g., when a user walks, jogs, or runs on the treadmill. The pulleys are mounted on a rotating roller tube so that the roller tube rotates with the pulleys. The roller tube is mounted on a stationary shaft using bearings on each side and a one-way device that allows the pulleys to rotate in one direction. The rotation direction corresponds to the movement of the top of the belt from the front to the rear of the treadmill. The one-way device prevents the pulleys from rotating in the opposite direction, preventing the top of the belt from moving from the rear of the treadmill to the front. The one-way device may be a sprag clutch. The treadmill may be a motor-less, curved treadmill.