Telescoping Bicycle Seat Post Friction Locking Mechanism
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Solution Overview
Problem
Existing telescoping assemblies for bicycle seat posts lack a reliable mechanism to maintain a desired telescopic position while allowing for adjustable height, as current solutions rely on fluid communication or mechanical obstructions, which may not provide sufficient frictional engagement or ease of adjustment.
Innovation Solution
A telescoping arrangement featuring a brake with a resiliently deformable annular sleeve that moves between a braking configuration, where it frictionally engages the inner tube, and a telescoping configuration, where it retracts, allowing for adjustable positioning, using hydraulic pressure to apply and release frictional force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a support reservoir with valve-governed fluid communication is used to support the inner tube, then the inner tube can be telescopically adjusted, but the mechanism becomes complex and may not provide sufficient frictional engagement
Solution Approach 1:
The patent replaces the complex valve-governed fluid communication mechanism with a simpler friction-based mechanical system. The braking element with friction surfaces directly engages the inner tube surface, using friction forces to maintain telescopic position without requiring fluid reservoirs, valves, or hydraulic/pneumatic systems.
Solution Approach 2:
The patent extracts and removes the complex fluid communication mechanism (support reservoir, valve, sink reservoir) from the telescoping assembly, retaining only the essential friction-based support function. The braking element provides the necessary frictional engagement without the cumbersome fluid management system.
2Device complexity
If mechanical obstruction is used to support the inner tube, then the structure is simple, but the frictional engagement may not be sufficient to maintain desired position
Solution Approach 1:
The patent applies local quality by concentrating frictional engagement at specific localized friction surfaces on the braking element that directly contact the inner tube. The braking element is designed with specific friction surfaces positioned to maximize contact area and frictional force at the critical interface, rather than distributing support across a simple mechanical obstruction structure.
Solution Approach 2:
The patent changes the parameter of frictional engagement by using a braking element with optimized friction surfaces that provide sufficient frictional force to maintain telescopic position. The friction coefficient and contact pressure are controlled through the braking element design, transforming a simple mechanical obstruction into a reliable friction-based positioning system.
3Reliability
If hydraulic clamping is used to maintain telescopic position, then reliable locking is achieved, but the ease of adjustment is reduced
Solution Approach 1:
The patent applies dynamics by making the braking element movable between different configurations. The braking element can be moved to engage friction surfaces for reliable locking at desired positions, or moved away to allow free telescopic adjustment. This dynamic positioning of the braking element provides both reliable locking when engaged and ease of adjustment when disengaged, without requiring complex hydraulic systems.
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 effectively maintains the inner tube in a fixed position relative to the outer tube with a high coefficient of friction, enabling precise adjustment and reliable locking, while allowing for easy telescoping by controlling the annular sleeve's position using a piston and fluid reservoir.
Implementation Method 1
at least one friction surface of the at least one braking element is driven outwardly against an inner surface of the inner tube to frictionally engage the inner surface of the inner tube and resist sliding thereof along the at least one friction surface
Implementation Method 2
Moving fluid from the support reservoir to the sink reservoir will telescopically collapse the inner tube, and moving fluid from the sink reservoir to the support reservoir will telescopically extend the inner tube
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A
AI summary
An inner tube moves axially between an outer tube and a support, all of which are concentrically arranged, to a desired telescopic position, relative to the outer tube and the support, and can be locked in the desired telescopic position by applying radial force between the support and the inner surface of the inner tube. The radial force generates a frictional force acting on the inner surface of the inner tube, which resists longitudinal movement of the inner tube. A bicycle actuator cable is coupled to an actuation connector for a tension-controlled actuator by a bicycle cable connector which has a fixed longitudinal position on the bicycle actuator cable. The bicycle cable connector is longitudinally consistently removably repeatably interengageable with the actuation connector to maintain longitudinal alignment of the bicycle actuator cable with the actuator through repeated engagement and disengagement of the bicycle cable connector and the actuation connector.