Bicycle Dropper Seat Post With Solenoid Valve Actuation
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Solution Overview
Problem
Existing height adjustable seat posts for bicycles, particularly dropper seat posts, are complex to manufacture and expensive due to the use of battery-powered motors and complex gear systems, requiring position monitoring systems.
Innovation Solution
The implementation of a solenoid-operated valve system that directly actuates the seat post to adjust height, eliminating the need for position monitoring and reducing manufacturing complexity by utilizing a telescopic arrangement with pneumatic chambers and a solenoid to control fluid flow between chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If battery-powered motors and complex gear systems are used for seat post height adjustment, then height adjustment functionality is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces battery-powered motors and complex gear systems with a pneumatic system consisting of a piston, fluid chambers, and solenoid-operated valves. This substitution eliminates the need for position monitoring systems and significantly reduces device complexity while maintaining height adjustment functionality.
Solution Approach 2:
The invention uses a pneumatic system with fluid-filled chambers and a piston to achieve seat post height adjustment. Solenoid-operated valves control fluid flow between chambers, enabling simple and reliable height adjustment without mechanical gears or motors.
2Measurement precision
If position monitoring systems are implemented in seat posts, then height adjustment precision is improved, but device complexity and cost increase
Solution Approach 1:
The pneumatic system inherently provides position indication through the physical state of fluid pressure and piston position. The system self-regulates height adjustment through pressure differentials without requiring external sensors or monitoring systems, eliminating complexity while maintaining functional precision.
3Ease of manufacture
If solenoid-operated valve system is used instead of motor system, then manufacturing complexity is reduced, but energy consumption characteristics change
Solution Approach 1:
The solenoid valves operate in periodic on/off cycles to control fluid flow, consuming energy only during valve actuation rather than continuous operation. This periodic action significantly reduces overall energy consumption compared to motor systems that require continuous power for positioning and holding.
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 manufacturing, reduces costs, and minimizes space requirements while providing efficient seat height adjustment with lower energy consumption.
Implementation Method 1
A solenoid is to control the valve
Implementation Method 2
manually actuated hydraulic height adjustable or 'dropper' seat posts may use a hydraulic pressure differential within the post
Implementation Method 3
The first and second chambers are filled with fluid
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. The height adjustable seat post also includes a shaft coupled to the lower tube and extending into the upper tube a piston assembly coupled to the shaft and disposed in the upper tube. The piston assembly includes a piston dividing the upper tube into a first chamber and a second chamber. The first and second chambers are filled with fluid. The piston assembly includes a valve operable between a closed state in which the fluid is blocked from flowing between the first and second chambers and an open state to enable the fluid to flow between the first and second chambers. The height adjustable seat post also includes a solenoid to control the valve.