Recumbent Step Exerciser Self-Centering Pedal Mechanism
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Solution Overview
Problem
Conventional stair climbing machines require users to stand, limiting their accessibility for physical therapy and rehabilitation, and are often too difficult for less fit individuals to use for extended periods, reducing the aerobic benefit of the workout.
Innovation Solution
A recumbent step exercise apparatus with a self-centering pedal system, allowing users to operate in a seated position, featuring a four-bar linkage mechanism, adjustable seat, and a braking system that can act as a generator, providing resistance and energy harvesting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional stair climbing machines are designed to require standing position, then the resistance mechanism can be simpler, but the accessibility for physical therapy and rehabilitation is limited
Solution Approach 1:
The patent transforms the static standing position requirement into a dynamic seated configuration where the user's body weight is leveraged through mechanical advantage. The recumbent position with pedals positioned between the user's legs allows the same resistance mechanism to serve both traditional and therapeutic applications, adapting to different user needs without requiring separate equipment.
Solution Approach 2:
The exercise device is designed to serve multiple functions: it provides cardiovascular conditioning for able-bodied users while simultaneously offering accessible rehabilitation options for those unable to stand. The seated configuration with adjustable resistance and pedal positioning creates a universal machine that accommodates diverse user populations including physical therapy patients and elderly individuals.
2Power
If stair climbing machines are designed with high resistance, then the workout intensity is improved, but the device becomes too difficult for less fit individuals to use for extended periods
Solution Approach 1:
The resistance mechanism incorporates adjustable parameters that allow users to modify the difficulty level according to their fitness level. The friction-based resistance system enables smooth, continuous adjustment from low to high resistance, allowing less fit individuals to start with lower settings and gradually increase intensity, thereby sustaining extended workout sessions without excessive difficulty.
Solution Approach 2:
The pedal mechanism dynamically adapts to user input through a four-bar linkage system that translates leg movements into resistance application. This dynamic response allows the resistance to be proportional to user effort, making the workout scalable and sustainable for various fitness levels throughout extended exercise sessions.
3Use of energy by moving object
If users stand during exercise, then the resistance mechanism can be simpler, but the aerobic benefit is reduced because users cannot effectively use their body weight
Solution Approach 1:
The seated position with pedals positioned between the legs creates a mechanical system where the user's body weight acts as a counterweight, leveraging gravity to enhance resistance effectiveness. This configuration allows users to utilize their full body weight in the seated position, maximizing aerobic benefit without requiring complex additional resistance mechanisms.
Solution Approach 2:
The four-bar linkage mechanism serves as an intermediary that efficiently transfers and amplifies the user's body weight into effective resistance force. This mechanical mediator converts the natural downward force of seated body weight into proportional resistance on the pedals, maximizing energy utilization and aerobic benefit while maintaining mechanism simplicity.
4Adaptability or versatility
If the pedal system is fixed in position, then the mechanism is simpler, but it cannot accommodate users of varying leg lengths
Solution Approach 1:
The pedal assembly incorporates a dynamic positioning system with four-bar linkages that allow the pedals to move through optimized arcs. This dynamic adjustment accommodates different leg lengths by modifying the pedal travel path and range, enabling users with varying anatomical dimensions to achieve proper exercise form without requiring fixed, one-size-fits-all pedal positioning.
Solution Approach 2:
The pedal system is segmented into independently adjustable components, including the pedal assemblies and seat position. This segmentation allows each component to be optimized for different user configurations, with the ability to adjust pedal position and seat location to accommodate varying leg lengths while maintaining overall system simplicity through modular design.
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
Enables users to perform a sustained cardiovascular workout in a seated position, accommodating varying leg lengths and body weights, enhancing accessibility and aerobic benefit by allowing effective use of body weight to overcome resistance.
Implementation Method 1
A brake is preferably employed for resisting motion of the first pedal assembly and the second pedal assembly
Implementation Method 2
The centering system includes a first spring in communication with the first pedal assembly and a second spring in communication with the second pedal assembly
Implementation Method 3
the brake may also act as a generator
Data Source
AI summary
A step exercise apparatus with a self-centering pedal system. The system comprising a frame and a seat supported from the frame. A first pedal assembly and a second pedal assembly are pivotally supported from the frame positioned so as to be manipulable by a user seated in the seat. A linkage is positioned in communication with the first pedal assembly and the second pedal assembly such that movement of either pedal assembly in a first direction causes movement of the other pedal assembly in a second direction opposite of the first direction. A brake is preferably employed for resisting motion of the first pedal assembly and the second pedal assembly in at least the first direction. A centering system positions the first and second pedal assemblies in a substantially central position when not being manipulated by the user.