Bicycle Dropper Seat Post Sealing and Magnetic Connector
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Solution Overview
Problem
Modern dropper seat posts face reliability issues due to seal deformation and extrusion under air pressure, and existing magnetic connectors are prone to ferrous debris contamination and damage during separation.
Innovation Solution
The introduction of a piston assembly with a solenoid-operated valve featuring a plug assembly with a secure O-ring seal and retainer, and a magnetic connector system that uses magnets to align and connect electrically, preventing direct contact and minimizing debris exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional seal arrangements are used in dropper seat posts, then the structure is simple, but seal deformation and extrusion occur under air pressure reducing reliability
Solution Approach 1:
The seal arrangement is divided into multiple components: O-ring seal, seal retainer, seal gland, and groove structure. Each component performs a specific function in preventing seal deformation and extrusion under air pressure, improving reliability through functional segmentation.
Solution Approach 2:
The seal retainer acts as an intermediary component between the O-ring seal and the seal gland. It provides additional support and positioning for the seal, preventing direct contact with the gland walls that could cause deformation or extrusion under pressure.
2Ease of operation
If magnetic connectors are used for electrical connection, then separation is easy, but ferrous debris contamination and damage can occur
Solution Approach 1:
The traditional mechanical connector system is replaced with a magnetic connector system that uses magnetic attraction forces for alignment and connection. This allows for easier separation without mechanical interlocking, reducing the risk of damage while maintaining electrical connectivity.
Solution Approach 2:
The magnetic field acts as an intermediary force between the connector components, providing attraction and alignment without direct mechanical contact. This reduces wear and damage during connection and separation operations.
3Adaptability or versatility
If manual clamping is used for seat post adjustment, then the mechanism is simple, but height adjustment during riding is not possible
Solution Approach 1:
A pneumatic system using compressed air is introduced to enable height adjustment during riding. The air pressure acts on a diaphragm to move the seat post vertically, providing adaptability without requiring complex mechanical actuation mechanisms.
Solution Approach 2:
The system uses the rider's own weight on the seat to provide the downward force needed for adjustment when air pressure is applied. The rider simply needs to press down on the seat while the air pressure controls the upward movement, eliminating the need for separate actuation mechanisms.
4Reliability
If direct wire contact connectors are used, then electrical connection is reliable, but wire damage occurs during separation
Solution Approach 1:
The mechanical wire contact connection is replaced with a magnetic connection system that maintains electrical connectivity through magnetic attraction. This eliminates the need for direct wire contact and mechanical interlocking, preventing wire damage during separation while maintaining connection reliability.
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
The solution enhances sealing reliability, reduces seal deformation, and prevents extrusion, while the magnetic connector system ensures easy separation without damaging wires and is less susceptible to ferrous debris.
Implementation Method 1
A magnetic attraction between the first and second magnets holds the first and second magnetic connectors together such that the first end surface is in contact with the second end surface and the first and second electrical contacts are in contact with the respective third and fourth electrical contacts.
Implementation Method 2
The piston assembly includes a valve to control fluid flow between the first and second chambers. The height adjustable seat post also includes an actuator to operate the valve.
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 includes a piston assembly in the upper tube that divides the upper tube into a first chamber and a second chamber. The piston assembly includes a valve to control fluid flow between the first and second chambers. The height adjustable seat post also includes an actuator to operate the valve. The height adjustable seat post further includes a connector assembly connected to the lower tube. The connector assembly is to be connected to a mating connector assembly on the bicycle. The connector assembly includes a magnetic connector including a housing having an end surface with an opening, first and second electrical contacts in the opening, and a magnet disposed in the housing and spaced from the end surface of the housing.