Living Hinge Plate Spring Auto-Open Mechanism
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Solution Overview
Problem
Conventional hinge designs for portable electronic devices face challenges such as complex flex cable paths, increased manufacturing and assembly complexity, and difficulty in miniaturization due to dimensional limitations.
Innovation Solution
A hinge arrangement utilizing a living hinge and plate springs that transition from a 'U' shape in the folded position to a straight shape in the open position, simplifying the flex cable path and enabling easier miniaturization, while also providing an auto-open feature and audible signaling for over-rotation prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hinge designs are used, then the device can function with flex cable connections, but the flex cable path becomes complicated and manufacturing complexity increases
Solution Approach 1:
The patent combines the hinge structure with the spring mechanism into an integrated assembly. The spring is positioned within the hinge structure itself, eliminating the need for separate cable management components and reducing overall system complexity while maintaining flex cable connectivity.
Solution Approach 2:
The hinge is divided into distinct functional segments: the hinge body, the spring mechanism, and the cable path channels. This segmentation allows each component to be optimized independently and simplifies manufacturing and assembly processes.
2Strength
If conventional hinge designs are used, then the device can maintain structural integrity, but miniaturization becomes difficult due to dimensional limitations
Solution Approach 1:
The spring mechanism is nested within the hinge structure itself, with the spring coils positioned inside the hinge body cavity. This nesting arrangement eliminates the need for additional external space, allowing the hinge to maintain its structural integrity while being compact enough for miniaturized devices.
Solution Approach 2:
The spring is oriented in a dimension perpendicular to the hinge rotation plane, utilizing vertical space within the hinge body rather than expanding the horizontal footprint. This dimensional reorganization allows compact integration without compromising structural strength.
3Force
If conventional springs are used, then the device can provide opening force, but the device requires mechanical stoppers to prevent over-rotation
Solution Approach 1:
The spring mechanism is designed to naturally limit the opening rotation through its own geometric constraints. The spring coils and mounting structure create a self-limiting mechanism that prevents over-rotation without requiring external stoppers, while still providing the necessary opening force.
Solution Approach 2:
The spring uses curved coil geometry that naturally guides the rotation arc and prevents excessive rotation. The curved structure of the spring coils creates a mechanical constraint that stops rotation at the appropriate angle without additional components.
4Ease of operation
If the hinge allows full 180-degree opening, then the device achieves complete unfolding, but components may be damaged by over-rotation
Solution Approach 1:
The spring mechanism provides self-protection by creating natural mechanical constraints that prevent over-rotation. The spring geometry and mounting structure work together to limit rotation to a safe range, protecting components from damage while still allowing complete functional unfolding.
Solution Approach 2:
The spring design incorporates preliminary protective action by establishing mechanical constraints before over-rotation can occur. The spring coils and mounting features create preemptive barriers that stop rotation at the safe limit, preventing potential component damage before it can happen.
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 simplifies manufacturing and assembly, reduces part count, allows for miniaturization, and provides an automatic open feature to 180 degrees without mechanical stoppers, while signaling potential misuse through an audible click, thus protecting the device's components.
Implementation Method 1
The plate spring is adapted to bend between a general 'U' shape when the first and second housing members are in a folded position and a substantially straight shape when the first and second housing members are in an open un-folded position
Data Source
AI summary
A hinge arrangement including a living hinge adapted to movably connect two members to each other; and at least one plate spring adapted to connect to the two members. When the two members are in a folded position, the living hinge has a general “U” shape and the plate spring has a general “U” shape aligned with and generally overlapping the general “U” shape of the living hinge.