Modular Bicycle Sizing Fit Cycle with Enclosed Transmission
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Solution Overview
Problem
Conventional sizing fit cycles are cumbersome, non-portable, hazardous due to exposed chain-driven systems, inefficient in adjustments, lack leveling indicators, and provide inconsistent results, making them impractical for custom bicycle fittings.
Innovation Solution
A modular, belt and chain-driven transmission system with enclosed components, screw-like adjustments, integrated leveling system, and a computer for data monitoring, replacing the traditional bicycle tire with a compact transmission that simulates a full-size bike ride, ensuring safety and precision in sizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bicycle tire is used in the sizing fit cycle, then the cycle can simulate a full-size bike ride, but the size of the cycle becomes large and portability is reduced
Solution Approach 1:
The patent divides the sizing fit cycle into modular components that can be detached and stored separately. The frame, resistance device, and other components can be disassembled into manageable sections for storage in a vehicle trunk or compact space, eliminating the need for a large stationary structure while maintaining full sizing functionality.
Solution Approach 2:
The patent employs nesting by placing the resistance device and other components within the frame structure itself. The flywheel and resistance mechanism are housed inside the frame tubes, and the seat post telescopes within the frame, allowing the entire system to collapse into a compact configuration that fits in a vehicle trunk when not in use.
2Reliability
If an open wheel bicycle tire is used, then the cycle can provide realistic pedaling resistance, but it creates safety hazards with exposed spokes
Solution Approach 1:
The patent extracts the essential function of the bicycle wheel (providing rolling resistance) while removing the hazardous open wheel structure. Instead of using a large exposed wheel, the invention employs a compact resistance device with an enclosed flywheel that generates equivalent pedaling resistance without any exposed rotating parts that could trap clothing or digits.
Solution Approach 2:
The patent creates a simplified copy of the wheel's resistance function using a magnetic or friction-based resistance mechanism. The enclosed flywheel system replicates the inertial resistance of a real bicycle wheel without requiring an actual large wheel, providing authentic pedaling feel while eliminating all wheel-related safety hazards.
3Power
If a chain driven system is used to rotate the wheel, then the cycle can transmit power effectively, but it creates additional safety hazards with exposed chains and sprockets
Solution Approach 1:
The patent extracts the power transmission function from the exposed chain and sprocket system and relocates it into an enclosed resistance device. The chain drive is contained within the frame structure, with the chain running inside protected channels or tubing, eliminating all pinch points while maintaining effective power transmission from the pedals to the resistance mechanism.
Solution Approach 2:
The patent uses enclosed channels or protective coverings to contain the chain drive system. The chain runs within protected conduits or is covered by protective shrouds that prevent contact with moving chain links and sprocket teeth, eliminating pinch point hazards while allowing the chain drive to function efficiently for power transmission.
4Power
If a chain driven system is used, then the cycle can provide mechanical advantage, but it requires frequent lubrication that creates mess and maintenance burden
Solution Approach 1:
The patent designs the chain drive system to be self-lubricating or low-maintenance. The chain is pre-lubricated with long-lasting lubricant during manufacturing and is designed to operate for extended periods without additional lubrication. The enclosed design protects the chain from contaminants that would accelerate wear and lubricant depletion, significantly reducing maintenance frequency and eliminating grease mess issues.
Solution Approach 2:
The patent changes the operational parameters of the chain drive by operating it in a controlled, enclosed environment with stable temperature and humidity. This reduces the rate of lubricant evaporation and contamination, extending the time between lubrication cycles from weekly to monthly or even seasonal maintenance intervals, greatly reducing the maintenance burden.
5Adaptability or versatility
If manual adjustment mechanisms are used, then the cycle can be adjusted for different riders, but the adjustment process becomes laborious and requires excessive strength
Solution Approach 1:
The patent replaces manual mechanical adjustment mechanisms with electric motors that automatically adjust the seat height, handlebar position, and wheel spacing. These electric adjustment systems provide powered movement that requires minimal user effort, allowing precise positioning without requiring the fitter to exert excessive physical strength or perform laborious manual cranking.
Solution Approach 2:
The patent employs hydraulic or pneumatic actuators to provide powered adjustment of the bicycle components. These fluid-powered mechanisms use pressurized fluid to move the seat, handlebars, and wheels to the correct positions, eliminating the need for manual force and providing smooth, controlled adjustment with minimal user input.
6Ease of operation
If electrically powered adjustment system is used, then adjustments can be made easily, but the cycle requires constant electricity which increases cost and creates trip hazards
Solution Approach 1:
The patent employs battery-powered adjustment mechanisms that operate independently without requiring external electrical outlets. The batteries provide portable power for adjustments and can be replaced when depleted, eliminating the need for complex wiring, outlets, and extension cords while maintaining easy automated adjustment capability. This disposable battery approach simplifies the electrical system compared to hardwired electric motors.
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
The solution enhances portability, safety, and precision in bicycle sizing by eliminating hazards, reducing maintenance needs, and providing consistent and accurate data for custom bicycle setups, making the process more efficient and repeatable.
Implementation Method 1
The transmission employs a ribbed-belt drive that does not slip
Implementation Method 2
The transmission has a resistance device that conveys data to a computer
Data Source
AI summary
A modular sizing fit cycle, having an enclosed, acoustically dampened transmission, and calibrated height and angle adjusters, each designed to fit an individual to a bicycle according to specific measurements attained during a controlled ride. The sizing fit cycle is highly portable, having distinct pieces that facilitate portability. Additionally, the sizing fit cycle is preferably equipped with a quiet, chain and bell-driven transmission at the rear, facilitating accurate measurements via a load generator and providing a realistic simulation of a stable cycling session.