Pedal-Driven Seat Height Adjustment for Personal Mobility
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Solution Overview
Problem
Existing seat height adjusting devices for personal mobility, such as electric bicycles and scooters, are cumbersome and require users to manually adjust the seat height while the vehicle is stopped, making it difficult and inconvenient for users with varying heights and physical conditions.
Innovation Solution
A seat height adjusting device with a hollow seat frame, a seat support shaft, a lifting screw shaft, a rotation screw shaft, and a power transmission system that allows users to adjust the seat height while riding by using a pedal shaft and a power connection device with a clutch member and electric actuator, enabling easy height adjustment without the need to dismount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual seat height adjusting device is used, then the structure is simple, but the ease of operation deteriorates because users must dismount to adjust the seat height
Solution Approach 1:
The patent combines the seat height adjustment function with the existing pedal drive system. The pedal shaft, which normally drives the vehicle forward, is integrated with the screw shaft that adjusts seat height. When the user pedals, the rotational motion is transmitted through gears to rotate the screw shaft, which moves the seat up or down. This merging eliminates the need for a separate adjustment mechanism and allows height adjustment during normal riding.
Solution Approach 2:
The pedal shaft serves dual functions: it drives the vehicle forward through the chain and sprocket system, and simultaneously adjusts the seat height through the gear-connected screw shaft. This multi-functionality reduces the need for additional components and allows users to adjust seat height without dismounting, as the same pedaling action performs both propulsion and adjustment.
2Ease of operation
If the seat height adjustment is integrated with the pedal shaft, then the ease of operation improves, but the device complexity increases due to additional power transmission components
Solution Approach 1:
The patent merges the seat adjustment mechanism with the existing power transmission system. The pedal shaft's rotational motion is diverted through a gear system to drive the screw shaft. This integration uses existing components (pedal shaft, gears, chain) to achieve dual functionality, minimizing the addition of separate adjustment mechanisms and reducing overall system complexity.
3Adaptability or versatility
If a power connection device with clutch member is used, then the adaptability improves by allowing adjustment during riding, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The power connection device uses a clutch member that can dynamically engage or disengage the connection between the pedal shaft and the screw shaft. This dynamic control allows the user to switch between normal driving mode (clutch disengaged) and seat adjustment mode (clutch engaged) as needed. The clutch mechanism provides flexibility and adaptability, enabling seat height adjustment during riding while maintaining simple operation through intuitive engagement and disengagement.
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 easily and conveniently adjust the seat height while on board, allowing for comfortable riding and accommodating different user heights and physical conditions, with the ability to adjust the seat height both during and after riding.
Implementation Method 1
a lifting screw shaft extending downward in a state of being fixed to the seat support shaft inside the seat frame
Implementation Method 2
a rotation screw shaft fastened to the lifting screw shaft inside the seat frame and configured to raise and lower the lifting screw shaft by rotating
Implementation Method 3
a power transmission shaft extending from the rotation screw shaft side toward the pedal shaft side inside the seat frame and having a lower portion connected to the pedal shaft by a plurality of gears
Implementation Method 4
The pedal shaft and the power transmission shaft may be disposed in a direction in which axes thereof cross each other, and the plurality of gears may include a driving bevel gear mounted on the pedal shaft and a driven bevel gear mounted on the power transmission shaft
Data Source
AI summary
A device for adjusting a seat height of a personal mobility includes a hollow seat frame extending in a longitudinal direction, a seat support shaft coupled to an upper portion of the seat frame and configured to slide upward and downward, a pedal shaft coupled to a lower portion of the seat frame, a lifting screw shaft extending downward in a state of being fixed to the seat support shaft inside the seat frame, and a rotation screw shaft fastened to the lifting screw shaft inside the seat frame and configured to raise and lower the lifting screw shaft by rotating based on operation of the pedal shaft.