Seat Post Head Assembly Independent Fore-Aft and Pitch Adjustment
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Solution Overview
Problem
Existing seat post systems lack the ability to independently adjust the fore-aft position and pitch of a seat on a vehicle, such as a bicycle, which are user-specific and do not accommodate varying rider preferences or terrain requirements, leading to discomfort and instability.
Innovation Solution
A seat post head assembly with a rotatable core and threaded chambers allows for independent adjustment of the seat's fore-aft position and pitch, featuring counteracting fasteners that prevent unwanted movement and provide a mechanical stop to prevent accidental pitch changes, even under high loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed seat position system is used, then the structure is simple and stable, but it cannot accommodate user-specific preferences or terrain requirements leading to discomfort
Solution Approach 1:
The seat adjustment mechanism is divided into two independent subsystems: a fore-aft position adjustment mechanism and a pitch adjustment mechanism. Each subsystem can be adjusted independently of the other, allowing users to customize both the forward-backward position and the tilt angle of the seat without interference between the two adjustment functions.
Solution Approach 2:
The seat post head assembly incorporates dynamic adjustment capabilities through threaded chambers with fasteners that allow continuous adjustment of both fore-aft position and pitch. The system transitions from a fixed state to an adjustable state, enabling real-time modification of seat geometry to match user preferences or terrain conditions.
2Ease of operation
If independent adjustment of fore-aft position and pitch is enabled, then user comfort is improved, but the risk of unwanted movement or accidental pitch changes increases
Solution Approach 1:
The mechanism incorporates preliminary counteracting forces through the threaded chamber design and fastener configuration. The threaded chambers create a mechanical interference pattern that resists unwanted movement, and the fasteners are positioned to provide counteracting forces that prevent accidental pitch changes while still allowing intentional adjustment when needed.
Solution Approach 2:
The threaded chambers act as intermediary elements between the adjustment fasteners and the seat post head. These chambers provide a controlled interface that translates rotational motion of the fasteners into precise linear adjustment of the seat position, while also serving as a mechanical filter that blocks unwanted movements from propagating through the system.
3Adaptability or versatility
If adjustment mechanisms are added to the seat post head, then adaptability is improved, but the structural complexity and potential failure points increase
Solution Approach 1:
The fore-aft adjustment mechanism and the pitch adjustment mechanism are merged into a single integrated seat post head assembly. Both adjustment functions share common components such as the threaded chambers and fastener system, allowing multiple adjustment capabilities to be achieved within a unified structural framework rather than requiring separate independent mechanisms.
Solution Approach 2:
The threaded chamber structure serves multiple functions simultaneously: it provides the threaded interface for fastener engagement, acts as a structural support element, and functions as a mechanical interference pattern for preventing unwanted movement. This multi-functionality reduces the need for additional separate components and simplifies the overall assembly.
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 'infinite' adjustment of the seat's position and pitch independently, enhancing rider comfort and stability by allowing personalized settings without affecting the other adjustment, and providing increased support against pitch slip.
Implementation Method 1
A seat post head assembly with a rotatable core and threaded chambers allows for independent adjustment of the seat's fore-aft position and pitch
Implementation Method 2
featuring counteracting fasteners that prevent unwanted movement and provide a mechanical stop to prevent accidental pitch changes
Data Source
AI summary
A seat post head assembly is disclosed. The assembly includes a housing coupled to a seat post, the housing including a cylindrical bore, and a first and second threaded chamber. A rotatable core is inserted into and rotates within the cylindrical bore, the rotatable core including a seat rail clamp assembly to fixedly clamp a set of seat rails and provide independent adjustment of a fore-aft location of the seat without affecting a pitch of the seat. The assembly additionally includes a first threaded member that threads into the first threaded chamber, contacts the rotatable core, and adjusts the pitch of the seat without affecting the fore-aft location of the seat. The assembly also includes a second threaded member that threads into the second threaded chamber, contacts a different portion of the rotatable core, and provides a physical hard stop against a change in the pitch.