Variable-Torque Hinge Assembly for Stable Laptop Cover Positioning
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Solution Overview
Problem
Conventional hinge assemblies in electronic devices, such as laptops, have a constant operating torque, leading to instability when the cover unit is unfolded due to accidental folding or further unfolding, especially with touch-sensitive display panels, and require high force for operation, making it inconvenient for users.
Innovation Solution
A hinge assembly with a variable operating torque, achieved through a hydraulic cylinder that moves a shaft along its longitudinal axis, increasing frictional forces when unfolding and decreasing them when folding, allowing for greater stability and ease of operation by adjusting the force required based on the angle of movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hinge assembly with constant operating torque is used, then the structure is simple, but the cover unit becomes unstable and may fold accidentally
Solution Approach 1:
The hinge assembly transitions from constant torque to variable torque based on the angle between cover and base units. The hydraulic cylinder dynamically adjusts frictional forces between shaft and annular holder, creating position-dependent resistance that stabilizes the cover at desired angles while preventing accidental folding.
Solution Approach 2:
The operating torque parameter is changed from constant to variable by modifying the frictional force between the shaft and annular holder through hydraulic pressure. This parameter change allows the hinge to provide different resistance levels at different angles, improving stability without requiring a completely complex mechanism.
2Reliability
If a hinge assembly with high operating torque is used, then stability is improved, but the force required for operation becomes too high
Solution Approach 1:
The hinge provides high torque only when needed for stability at specific angles, not during the entire folding/unfolding motion. The hydraulic cylinder dynamically modulates frictional resistance, creating high operating torque at stable positions while maintaining low torque during transitions, thus improving both stability and ease of operation.
Solution Approach 2:
The hydraulic cylinder applies preliminary counteracting frictional force to prevent accidental folding before it occurs. By creating resistance proportional to the tendency of the cover to fold, the system counteracts destabilizing forces (weight, user interaction) while allowing intentional folding when sufficient force is applied.
3Ease of operation
If a hinge assembly with low operating torque is used, then ease of operation is improved, but the cover unit becomes unstable and may fold accidentally
Solution Approach 1:
The hinge dynamically adjusts torque based on operational context: low torque during intentional folding/unfolding operations for ease of use, and high torque when the cover is held at specific angles for stability. The hydraulic system responds to motion state, providing appropriate resistance levels automatically.
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 hinge assembly provides enhanced stability and flexibility, preventing accidental movements while allowing easy operation by varying the force needed to move between folded and unfolded positions, especially at specific angles, thus improving user convenience and device stability.
Implementation Method 1
a hydraulic cylinder coupled to the shaft. The hydraulic cylinder is capable to move the shaft along a longitudinal axis of the shaft, based on a movement of the hinge assembly between the folded position and the unfolded position
Implementation Method 2
The hinge assembly includes a channel, an annular holder disposed in the channel, a shaft engaged with the annular holder... increasing frictional forces when unfolding and decreasing them when folding
Data Source
AI summary
In an example, a device includes a base unit, a cover unit, and a hinge assembly to couple the cover unit to the base unit The hinge assembly is moveable between a folded position and an unfolded position. The hinge assembly includes a channel, an annular holder disposed in the channel, a shaft engaged with the annular holder, and a hydraulic cylinder coupled to the shaft. The hydraulic cylinder is to move the shaft along a longitudinal axis of the shaft, based on a movement of the hinge assembly between the folded position and the unfolded position, to vary an operating torque of the hinge assembly.