Bicycle Seat Post Spacer for Height Adjustment
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Solution Overview
Problem
Existing height adjustable seat posts for bicycles often have a fixed stroke range that may not accommodate riders of varying heights or preferences, particularly for shorter riders who require a lower top-out height.
Innovation Solution
The introduction of a spacer in the second chamber of the seat post reduces the overall length of the seat post in the fully extended position, allowing the seat to be topped out at a lower height, which is advantageous for certain riders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the seat post stroke range is increased to accommodate taller riders, then the top-out height is increased, but this prevents shorter riders from achieving their optimal seat height
Solution Approach 1:
The seat post system incorporates a movable spacer that can be repositioned along the shaft between different chambers. This allows the effective stroke range and top-out height to be dynamically adjusted based on rider height requirements. The spacer can be moved to different positions to change the length of the seat post in the extended position, enabling the same physical seat post to accommodate both taller and shorter riders optimally.
2Adaptability or versatility
If the seat post is made longer to provide more adjustment range, then the adaptability for different riders is improved, but the overall height of the seat post increases
Solution Approach 1:
The seat post is segmented into multiple functional chambers (first chamber and second chamber) along the shaft, with the spacer capable of being positioned in different chambers. This segmentation allows the seat post to have different effective lengths depending on where the spacer is positioned, providing multiple adjustment ranges from the same physical structure without requiring multiple separate seat posts.
3Length of moving object
If a longer seat post is used to accommodate taller riders, then the top-out height is increased, but this reduces the optimal seat height for shorter riders
Solution Approach 1:
The system allows dynamic reconfiguration of the seat post length by moving the spacer to different positions along the shaft. For shorter riders, the spacer can be repositioned to reduce the effective length and lower the top-out height, while for taller riders, the spacer can be moved to extend the stroke range. This dynamic adjustment resolves the contradiction between providing sufficient height for tall riders and maintaining optimal height for short riders.
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 enables the seat post to be adjusted to a lower top-out height, improving comfort and pedaling efficiency for shorter riders by reducing the overall height of the seat post in the fully extended position.
Implementation Method 1
manually actuated hydraulic height adjustable or 'dropper' seat posts may use a hydraulic pressure differential within the post and require manual operation to adjust the seat post height
Data Source
AI summary
Height adjustable seat posts for bicycles are described herein. An example seat post includes an upper tube and a lower tube are configured in a telescopic arrangement and moveable between at least a first position and a second position. The seat post includes an upper sealhead, a lower sealhead, a shaft coupled to the lower tube and extending through the lower sealhead and into the upper tube, and a piston in the upper tube and coupled to the shaft. The piston divides the upper tube into a first chamber between the piston and the upper sealhead and a second chamber between the piston and the lower sealhead. The seat post also includes a spacer in the second chamber between the piston and the lower sealhead to reduce a length of the height adjustable seat post in at least one of the first and second positions.