Shock-Absorbing Seatpost Preload Adjustment Without Frame Removal
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Solution Overview
Problem
Existing shock-absorbing seatposts require removal from the bicycle frame for adjusting preload, which is inconvenient for riders with varying body weights and terrain conditions.
Innovation Solution
A preload adjustable shock-absorbing seatpost assembly with an adjustment device allowing direct adjustment of the buffering member's preload without removing the seatpost, featuring a linkage device and a pressure adjusting unit protruding outward for easy manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the nut at the lower end of the compression spring is adjusted to change the preload, then the shock-absorbing coefficient can be adapted to different terrains and rider weights, but the entire seatpost must be removed from the frame for adjustment
Solution Approach 1:
The adjustment device is segmented into multiple functional components: a pressure adjusting unit with threaded rod and nut for preload adjustment, an auxiliary pressure adjusting unit at the lower end, and a linkage device with four-bar mechanism. This segmentation allows different parts to perform specific functions independently, enabling adjustment without full seatpost removal.
Solution Approach 2:
The pressure adjusting unit acts as an intermediary mechanism between the rider and the compression spring. By providing a threaded rod and nut assembly that can be adjusted from the upper end, it mediates the preload adjustment function without requiring direct access to the spring's lower end, thus eliminating the need to remove the seatpost.
2Ease of repair
If the seatpost is removed for preload adjustment, then the nut can be accessed for changing the compression spring preload, but significant inconvenience and time loss occur for riders
Solution Approach 1:
The pressure adjusting unit is preliminarily configured at the upper end of the seatpost with the threaded rod and nut assembly positioned for easy access. This preliminary placement of the adjustment mechanism at a convenient location allows riders to perform preload adjustment without time-consuming removal of the seatpost.
Solution Approach 2:
Instead of placing the adjustment mechanism at the lower end of the compression spring (which would require seatpost removal for access), the invention inverts the approach by positioning the pressure adjusting unit with its adjustment components at the upper end of the seatpost, making it accessible without removal.
3Ease of operation
If a pressure adjusting unit protruding outward is provided, then direct adjustment without seatpost removal is enabled, but the device structure becomes more complex
Solution Approach 1:
The pressure adjusting unit serves multiple functions: it provides preload adjustment through the threaded rod and nut, acts as a structural connector between the linkage device and the buffering member, and the protruding configuration provides both adjustment access and mechanical leverage. This multi-functionality reduces the need for separate components.
Solution Approach 2:
The adjustment device merges the pressure adjusting unit with the linkage device and buffering member into an integrated assembly. The pressure adjusting unit is combined with the four-bar linkage mechanism and the compression spring assembly, reducing the number of separate components and simplifying the overall structure despite the protruding configuration.
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 quick and convenient adjustment of shock-absorbing preload, providing a comfortable riding experience by attenuating vibrations based on rider weight and terrain conditions.
Implementation Method 1
a buffering member disposed inside the seatpost and provided with an end abutted against the pressure adjusting unit of the adjustment device
Implementation Method 2
By adjusting the tightness of the nut at the lower end of the compression spring, the preload of the compression spring can be changed
Data Source
AI summary
A shock-absorbing seatpost assembly includes a seatpost, a linkage device, an adjustment device, and a buffering member. The linkage device is connected with an end of the seatpost, and the adjustment device is movably inserted into the seatpost. The adjustment device is provided with a pressure adjusting unit abutted against a pushing member provided at the linkage device. An end of the pressure adjusting unit protrudes outward from the end of the seatpost. The buffering member is disposed inside the seatpost and has an end abutted against the pressure adjusting unit of the adjustment device. Accordingly, the portion of the pressure adjusting unit exposed outside the seatpost provides adjustment of the preload of the buffering member for riders of different body weights.