Multi-position Adjustable Height Seat Post with Sealed Detent Locking

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Solution Overview

Problem

Conventional multi-position adjustable height bicycle seat posts experience wear and tear issues due to interaction between the inner tube and ball bearings, leading to premature aging and manufacturing complexities, while also being prone to dirt and water ingress.

Innovation Solution

A multi-position adjustable height seat post design featuring an inner tube and outer tube with a locking assembly that uses spherical elements and detent elements, along with an air spring for height adjustment, providing improved wear resistance and easier fabrication, and incorporating a sealing mechanism to prevent contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If ball bearings are used for height adjustment, then the seat post can move smoothly between positions, but the inner tube surface wears quickly and appearance degrades

Engineering Contradiction:

Improvesmooth movementVSAvoidappearance durability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The invention extracts the ball bearings from direct contact with the inner tube surface. Instead, ball bearings are contained within grooves in the outer tube, engaging with detent elements on the inner tube. This separation eliminates the wear mechanism between ball bearings and the inner tube surface while maintaining smooth movement functionality.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention introduces detent elements as intermediary components between the ball bearings and the inner tube. These detent elements engage with the ball bearings to enable movement while protecting the inner tube surface from direct contact and wear, thus preserving appearance durability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If multiple components are used for locking mechanism, then the height adjustment functionality is achieved, but the manufacturing process becomes complex

Engineering Contradiction:

Improveheight adjustment functionalityVSAvoidmanufacturing process

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The invention merges the locking and adjustment functionalities into a unified mechanism. The same detent elements that enable height adjustment also serve as the locking mechanism by engaging with ball bearings at specific positions. This integration reduces the number of separate components and simplifies the manufacturing process.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The detent elements perform multiple functions: they enable smooth movement between positions, provide locking at adjusted heights, and prevent unintended movement. This multi-functionality reduces the overall component count and simplifies manufacturing while maintaining full height adjustment functionality.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If the inner tube is exposed for adjustment, then height adjustment is accessible, but dirt and water can ingress into the mechanism

Engineering Contradiction:

Improveadjustment accessibilityVSAvoidcontamination

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The invention uses a seal member (flexible film/shell) that covers the adjustment mechanism. This seal allows the mechanism to remain protected from dirt and water ingress while still permitting the necessary movement and adjustment operations. The flexible nature of the seal accommodates the movement of internal components without compromising protection.

Inventive Principle:

Principle #30Flexible shells and thin films

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 design enhances the external appearance by hiding wear damage, reduces weight, improves sealing, and simplifies manufacturing, while maintaining effective height adjustment and preventing rotational movement.

Implementation Method 1

upward via air pressure

Methodology Applied

Scientific EffectAir pressure: Pressure Increase

Implementation Method 2

the spherical elements engage with the spherical detent elements respectively

Methodology Applied

Scientific EffectMechanical engagement: Mechanical Force

Implementation Method 3

incorporating a sealing mechanism to prevent contamination

Methodology Applied

Scientific EffectSealing: Physical Containment

Data Source

PatentUS8894025B2Multi-position adjustable height seat post

Publication Date: 2014.11.25 TIEN HSIN INDS

AI summary

A multi-position adjustable height seat post comprises an inner tube, an outer tube, a locking assembly, a triggering device, a first extending element, and a second extending element disposed between the tubes. The locking assembly comprises an actuating unit, a plurality of parallel grooves located in the outer tube, a plurality of spherical detent elements located, in the grooves, and a plurality of spherical elements located in the inner tube. The triggering device connects to the actuating unit. The first extending element constantly pushes the to actuating unit moving in a first direction. The second extending element disposes between the tubes. Once the triggering device is triggered, the actuating unit moves in a second direction contrary to the first direction and makes the spherical elements to move inward laterally to let the inner tube and outer tube move relative to each other freely.