Dual-Screen Hinge With On-Demand Torque Locking for Fine Adjustment
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Solution Overview
Problem
Dual-screen clamshell devices face challenges in achieving ergonomic viewing angles and fine adjustability without requiring excessive torque, which can damage fragile components and complicate operation.
Innovation Solution
A hinge mechanism with a selectively engageable locking function and a one-way needle bearing allows the secondary screen housing to pivot freely in one direction while preventing rotation in the other, utilizing a low torque trigger and a shape-memory alloy biasing member for enhanced adjustability and user control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional hinge mechanism is used to enable dual-screen adjustability, then the device can achieve viewing angle adjustment, but it requires excessive torque that can damage fragile components
Solution Approach 1:
The hinge mechanism transitions from a static, continuously adjustable design to a dynamic system with discrete engagement positions. The secondary display can be freely positioned during adjustment but locks into specific angular positions when the locking mechanism engages, providing stability while limiting maximum torque requirements to safe levels that protect fragile components.
Solution Approach 2:
The system changes the torque parameter from high (traditional hinge) to low (trigger mechanism with spring biasing). The shape-memory alloy biasing member provides a controlled torque range that is sufficient for positioning but limited to prevent damage to fragile display components, fundamentally changing the torque parameter from potentially damaging levels to safe levels.
2Adaptability or versatility
If a traditional hinge mechanism is used to enable dual-screen adjustability, then the device can achieve viewing angle adjustment, but it complicates operation due to high torque requirements
Solution Approach 1:
The hinge mechanism transitions from a static, continuously adjustable design to a dynamic system with discrete engagement positions. The secondary display can be freely positioned during adjustment but locks into specific angular positions when the locking mechanism engages, providing stability while limiting maximum torque requirements to safe levels that protect fragile components.
Solution Approach 2:
The system changes the torque parameter from high (traditional hinge) to low (trigger mechanism with spring biasing). The shape-memory alloy biasing member provides a controlled torque range that is sufficient for positioning but limited to prevent damage to fragile display components, fundamentally changing the torque parameter from potentially damaging levels to safe levels.
3Reliability
If a locking mechanism is added to prevent excessive rotation, then component protection is improved, but device complexity increases
Solution Approach 1:
The hinge mechanism incorporates a self-locking feature where the trigger mechanism automatically engages with the locking surfaces and the shape-memory alloy biasing member automatically maintains the locked position. The system uses its own internal forces (spring biasing and shape-memory alloy recovery) to maintain the locked state without requiring external actuators or complex control systems, achieving component protection through self-service functionality.
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 easy articulation of dual-screen devices to desired viewing angles with reduced risk of component damage, improving ease of operation and user experience through low-torque, fine-adjustable hinge functionality.
Implementation Method 1
a one-way needle bearing fixedly coupled to the base housing, wherein the second shaft passes through the one-way needle bearing, and wherein the one-way needle bearing allows the second shaft to freely rotate in a first direction, and wherein the one-way needle bearing prevents rotation of the second shaft in a second direction
Implementation Method 2
a shape-memory alloy biasing member for enhanced adjustability and user control
Implementation Method 3
a shape-memory alloy biasing member coupled to the coupling joint, wherein the shape-memory alloy biasing member biases the coupling joint to be engaged
Data Source
AI summary
Technologies for a hinge for a dual-screen clamshell computing device include a hinge having a drive shaft and a driven shaft. The drive shaft is fixed to a member such as a secondary display housing of the computing device. The driven shaft is rotatably coupled to another member such as a base housing of the computing device. The hinge includes a one-way needle bearing fixed to the same member as the driven shaft. The driven shaft passes through the one-way needle bearing, which allows free rotation of the driven shaft in one direction and prevents rotation of the driven shaft in the other direction. The hinge includes a coupling joint that selectively couples the drive shaft and the driven shaft. The computing device includes a trigger that is operable to selectively engage and disengage the coupling joint of the hinge. Other embodiments are described and claimed.