Bicycle Seat Post Two-Way Spring-Assist Height Adjustment
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Solution Overview
Problem
Existing bicycle seat post adjustment systems require riders to be stationary, limiting the ability to adjust seat height during riding, particularly in dynamic off-road conditions where lowering the center of gravity is beneficial.
Innovation Solution
A seat post assembly with a telescopically movable upper support relative to a lower support, utilizing a spring system and a drive mechanism with a unidirectional rotor and locking mechanism, allowing for on-the-fly height adjustments via a pawl and notch system, enabling energy storage and release for seamless height changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional binder bolt system is used for seat post adjustment, then the structure is simple and reliable, but the seat height cannot be adjusted while riding
Solution Approach 1:
The seat post adjustment mechanism transitions from a static binder bolt system to a dynamic system that allows adjustment during motion. The telescoping tubes with internal threading enable the seat to be raised or lowered while the bicycle is in motion, converting a stationary adjustment mechanism into a dynamic one that responds to rider needs during riding.
Solution Approach 2:
A cable system acts as an intermediary between the rider's control input and the seat adjustment mechanism. The cable transmits force through the frame to operate the threading mechanism inside the telescoping tubes, enabling remote control of seat height adjustment without direct mechanical connection at the seat post.
2Adaptability or versatility
If an electric motor with threaded rod is used for on-fly adjustment, then seat height can be adjusted while riding, but the device complexity and cost increase
Solution Approach 1:
The patent replaces the electric motorized threaded rod system with a purely mechanical cable-operated threading mechanism. The cable pulls on a threaded component inside the telescoping tubes, converting rotational motion of the cable into linear extension or retraction of the seat post, thereby achieving motorized functionality through mechanical means alone.
Solution Approach 2:
The threading mechanism inside the telescoping tubes is designed to be self-contained and self-actuating through cable tension. The mechanical threads automatically engage and disengage the telescoping sections when cable force is applied, eliminating the need for external motors, sensors, or electronic control systems.
3Adaptability or versatility
If a spring-biased telescoping system with hydraulic lock is used, then on-fly adjustment is enabled, but the device complexity and potential failure points increase
Solution Approach 1:
The patent extracts and eliminates the hydraulic locking mechanism from the system, relying instead on the inherent friction and mechanical interference of the threaded cable system within the telescoping tubes to maintain position. This removal of complex hydraulic components reduces potential failure points while maintaining adjustment functionality.
Solution Approach 2:
The design accepts that the cable and threading mechanism are simpler, potentially less durable components compared to hydraulic systems, but they are easier to replace and maintain. The mechanical components are designed for simplicity and replaceability rather than long-term indestructibility.
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
Enables dynamic adjustment of seat height while riding, enhancing safety and comfort by lowering the center of gravity during high-speed off-road riding and returning to a comfortable position for efficient pedaling.
Implementation Method 1
an actuating mechanism to facilitate moving the upper seat support relative to the lower seat support. The actuating mechanism comprises a spring (e.g., a coil spring) having a first node and a second node
Implementation Method 2
the reciprocating driver is driven by a unidirectional rotor (e.g., including a one-way clutch)
Data Source
AI summary
A bicycle is disclosed as having a seat and a seat post assembly supported supporting the seat. The seat post assembly includes a lower seat support, an upper seat support secured to the seat and movable (e.g., telescopically) relative to the lower seat support, a locking mechanism for selectively locking and unlocking the upper seat support relative to the lower seat support, and an actuating mechanism to facilitate moving the upper seat support relative to the lower seat support. The actuating mechanism comprises a spring having first and second nodes, and a drive system adapted drive the second node while the first node is engaged with the upper seat support to energize the spring. In one embodiment, the drive system comprises a reciprocating driver constructed to drive either one of the first node and the second node. Preferably, the reciprocating driver is driven by a unidirectional rotor.