Variable Friction Hinge Assembly for Direction-Dependent Resistance
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Solution Overview
Problem
Existing computing devices with traditional hinge assemblies lack the ability to provide variable resistance to rotation, making it difficult to maintain specific orientations and requiring consistent user force to open or close, which can lead to user discomfort and accidental changes in device position.
Innovation Solution
The implementation of variable resistance hinge assemblies that utilize friction clips with different free ranges of rotation and contact surfaces to provide increasing resistance in one direction and decreasing resistance in the opposite direction, ensuring the device maintains desired orientations with minimal user effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional hinge assemblies are used, then the device can open and close freely, but the device cannot maintain specific orientations and requires consistent user force
Solution Approach 1:
The hinge assembly transitions from a static friction mechanism to a dynamic one where friction clips can engage and disengage from contact surfaces. The system adapts its resistance characteristics based on rotation direction: providing high friction when clips engage to maintain orientation, and low friction when they disengage to allow easy opening/closing transitions.
Solution Approach 2:
The hinge assembly changes the friction parameter dynamically based on rotation direction and orientation. By varying the engagement state of friction clips with contact surfaces, the system adjusts resistance levels to provide either high stability (when clips engage) or high ease of operation (when clips disengage), resolving the contradiction between these two requirements.
2Stability of the object's composition
If high resistance is provided to maintain orientation, then the device stays in position, but user effort increases to change position
Solution Approach 1:
The hinge assembly segments the resistance mechanism into multiple independent friction clips, each capable of engaging or disengaging from contact surfaces. This segmentation allows the system to provide high resistance only when needed for specific clips at specific orientations, rather than continuously high resistance across all orientations, thereby reducing overall user effort while maintaining stability when required.
Solution Approach 2:
The hinge assembly dynamically adjusts resistance levels by controlling the engagement state of individual friction clips. When transitioning between orientations, clips disengage to minimize resistance and user effort. When maintaining a desired orientation, clips engage to provide high resistance and stability. This dynamic adjustment resolves the contradiction between maintaining orientation and minimizing user force.
3Reliability
If consistent friction is provided throughout rotation, then the device is stable, but the user experience deteriorates with accidental position changes
Solution Approach 1:
The hinge assembly transitions from consistent friction to dynamic friction control where resistance varies based on rotation direction and orientation. The system provides high friction (high reliability) when clips engage to prevent accidental position changes, and low friction (high ease of operation) when clips disengage to allow intentional repositioning with minimal effort, thus resolving the contradiction between reliability and ease of operation.
Solution Approach 2:
The hinge assembly changes the friction parameter dynamically based on the engagement state of friction clips. By adjusting friction levels according to orientation and rotation direction, the system achieves high reliability (preventing accidental changes) when clips are engaged, while maintaining ease of operation (allowing intentional changes) when clips are disengaged, resolving the contradiction between these two requirements.
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
This solution allows for easy opening and closing of devices while maintaining orientations, enhancing user experience by requiring less force to reopen and ensuring the device stays in the desired open position without inadvertently closing.
Implementation Method 1
multiple friction clips friction fit around the hinge shaft and rotating with the hinge shaft between a first contact surface and a second contact surface
Data Source
AI summary
The description relates to hinged devices, such as hinged computing devices. One example can include first and second portions that rotate around a hinge shaft that is fixedly secured to the first portion and rotationally secured to the second portion. The second portion defining a first contact surface spaced apart from a second contact surface. Multiple friction clips friction fit around the hinge shaft and rotating with the hinge shaft between the first contact surface and the second contact surface.