Bicycle Dropper Seat Post Rotary Valve for Low-Power Height Adjustment
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Solution Overview
Problem
Existing height adjustable seat posts for bicycles, known as dropper seat posts, are complex and costly due to their reliance on hydraulic or pneumatic systems with mechanically or hydraulically actuated valves, requiring additional power to overcome pressure differentials and position monitoring, which increases manufacturing complexity and costs.
Innovation Solution
The implementation of a motor-operated rotary valve that switches between open and closed states without changing the volume of the pneumatic chambers, reducing the power required to operate the valve and eliminating the need for position monitoring, allowing for a non-volume displacing, self-latching mechanism that maintains the seat height adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If hydraulic or pneumatic systems with mechanically or hydraulically actuated valves are used, then height adjustment function is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts and eliminates the complex hydraulic or pneumatic actuation systems from the seat post, retaining only the essential height adjustment function through a simpler spring-loaded mechanism with a release valve, thereby reducing device complexity while maintaining the core functionality
Solution Approach 2:
The patent replaces complex hydraulic or pneumatic systems with a mechanical spring-loaded expansion mechanism controlled by a simple valve, substituting sophisticated fluid dynamics systems with a more straightforward mechanical system that achieves the same height adjustment function
2Ease of operation
If hydraulic or pneumatic systems with position monitoring are used, then height adjustment function is achieved, but power consumption increases
Solution Approach 1:
The spring-loaded expansion mechanism is self-actuating and does not require external power sources or position monitoring systems, making the system self-service and eliminating continuous power consumption while maintaining height adjustment capability
Solution Approach 2:
The system uses periodic manual actuation of the release valve rather than continuous power consumption, with the spring providing stored energy between actuations, thereby converting continuous power requirements into periodic manual operations
3Ease of operation
If mechanically or hydraulically actuated valves are used, then height adjustment function is achieved, but manufacturing cost increases
Solution Approach 1:
The patent employs a simple valve mechanism that can be manufactured at low cost, replacing expensive hydraulic or pneumatic components with more economical mechanical parts that are easier and cheaper to manufacture
Solution Approach 2:
The system divides the height adjustment function into separate components: a spring-loaded expansion mechanism and a simple release valve, allowing each component to be manufactured independently at lower cost rather than as an integrated expensive system
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 simplifies the manufacturing process, reduces costs, and conserves battery life by minimizing power consumption, as the rotary valve remains in its state without continuous motor activation, effectively addressing the complexity and expense issues of existing systems.
Implementation Method 1
A motor-operated rotary valve switches between open and closed states without changing the volume of the pneumatic chambers
Implementation Method 2
The rotatable member is rotatable relative to the fixed member between a closed position in which the rotatable member blocks the fluid flow passageway to prevent fluid flow between the first and second chambers and an open position to enable fluid flow through the fluid flow passageway and between the first and second chambers
Data Source
AI summary
Height adjustable seat posts for bicycles are described herein. An example height adjustable seat post includes an upper tube and a lower tube configured in a telescopic arrangement and a piston in the upper tube. The piston divides the upper tube into first chamber and second chambers. The first and second chambers are filled with fluid. The height adjustable seat post also includes a valve including a fixed member and a rotatable member forming a face seal between a first face of the fixed member and a second face of the rotatable member. The fixed member has a fluid flow passageway. The rotatable member is rotatable relative to the fixed member between a closed position in which the rotatable member blocks the fluid flow passageway to prevent fluid flow between the first and second chambers and an open position to enable fluid flow through the fluid flow passageway and between the first and second chambers.