Locking Pivot Joint for Foldable Scooter Handlebar Stability
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Solution Overview
Problem
Collapsible foot-deck-based vehicles face issues with securing the handlebar assembly relative to the foot deck, leading to rattling joints and potential weakening of structural integrity, particularly due to the placement of the pivot joint between the foot deck and front wheel assembly.
Innovation Solution
A locking pivot joint with a pivot axis inclined between 30 degrees and 60 degrees from the horizontal plane, featuring a biasing member and protrusions on the locking faces that provide a secure locking mechanism, allowing easy pivoting between riding and collapsed configurations while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pivot joint is used to connect the handlebar assembly and foot deck to enable folding, then the vehicle becomes collapsible for storage and transport, but the joint becomes loose and rattles during operation
Solution Approach 1:
The pivot joint incorporates a dynamic locking mechanism that transitions between locked and unlocked states. During operation, the locking surfaces engage to rigidly fix the joint, preventing rattling. During folding, the joint can be easily unlocked and repositioned. This dynamic behavior resolves the contradiction by providing both stability during use and flexibility during storage.
Solution Approach 2:
The invention changes the friction parameter at the pivot joint through the use of friction surfaces and locking mechanisms. The locking surfaces are designed to create sufficient friction to prevent relative movement during operation, eliminating rattling. The mechanism allows parameter change from a loose state (for folding) to a tight state (for operation), resolving the contradiction between collapsibility and joint stability.
2Adaptability or versatility
If the pivot joint is placed between the foot deck and front wheel assembly, then folding is enabled, but the structural integrity of the vehicle is weakened
Solution Approach 1:
The locking mechanism is designed to engage the pivot joint in a predetermined locked position before operation begins. This preliminary locking action ensures that the joint is securely fixed prior to any loading or stress during vehicle operation, maintaining structural integrity at the folding location.
Solution Approach 2:
The pivot joint assembly uses composite construction with multiple components including locking surfaces, friction elements, and structural members working together. This composite approach distributes stresses across multiple interfaces and materials, maintaining overall structural integrity even though the joint location is a potential weak point for folding.
3Reliability
If a locking mechanism is added to secure the pivot joint, then rattling is prevented, but the device complexity increases
Solution Approach 1:
The locking mechanism is merged with the pivot joint structure itself, using the same components that enable folding also to provide locking. The locking surfaces are integrated into the pivot joint assembly, eliminating the need for separate locking devices. This merging reduces overall complexity while maintaining joint security and preventing rattling.
Solution Approach 2:
The pivot joint locking mechanism is designed to be self-servicing through friction-based locking surfaces that automatically engage and maintain locking without requiring external power or complex actuation. The friction surfaces self-adjust to maintain optimal locking force, reducing the need for additional control systems and simplifying the overall mechanism.
Data Source
AI summary
In an aspect, a pivot joint for a collapsing foot-deck-based vehicle is described, comprising a foot deck, at least two wheels coupled to the foot deck, and a handlebar assembly coupled to the foot deck via a locking pivot joint, also referred to as a locking swivel joint, the handlebar assembly comprising at least one handle, the locking pivot joint having a pivot axis that is generally unparallel with a horizontal plane defined by the lowermost surfaces of the at least two wheels, the handlebar assembly being selectively pivotable via the locking pivot joint between a riding configuration in which the handle is generally distal from the foot deck and a collapsed configuration in which the handle is generally proximal to the foot deck.