Friction Hinge with Clutch-Based Directional Resistance
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Solution Overview
Problem
Existing hinges in electronic devices often require equal effort to open and close, which can be inconvenient for users and may affect device stability, as they lack differential resistance levels to facilitate easier closing without compromising stability.
Innovation Solution
The implementation of friction hinges with a clutch-based locking mechanism that provides lower closing resistance and higher opening resistance, achieved through a collar and roller clutch configuration, allowing the collar to lock and unlock based on the direction of hinge movement, thereby tuning resistance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hinge uses equal resistance for opening and closing, then device stability is maintained, but user convenience deteriorates due to increased effort required for closing
Solution Approach 1:
The hinge employs a clutch mechanism that dynamically adjusts resistance based on the direction of movement. When closing, the clutch disengages to reduce resistance; when opening, the clutch engages to increase resistance. This dynamic adjustment resolves the contradiction by making the hinge adaptive to different operational directions rather than maintaining static equal resistance.
Solution Approach 2:
The invention changes the friction parameter of the hinge based on movement direction. Through the clutch mechanism, the friction coefficient is reduced during closing operations and increased during opening operations. This parameter change allows the hinge to provide different resistance levels for different directions, improving closing ease without compromising opening stability.
2Ease of operation
If a hinge provides lower closing resistance, then user convenience improves, but device stability may deteriorate
Solution Approach 1:
The hinge design introduces asymmetry in the resistance profile by using a clutch mechanism that creates different friction characteristics for opening and closing directions. The clutch is positioned and configured to engage differently based on rotation direction, providing asymmetric resistance that lowers closing force while maintaining opening stability, thus resolving the contradiction between ease of closing and device stability.
3Ease of operation
If a hinge uses a clutch mechanism with collar, then differential resistance levels are achieved, but device complexity increases
Solution Approach 1:
The clutch mechanism is integrated directly into the hinge assembly, merging the clutch components (collar, friction elements) with the hinge structure. This integration allows differential resistance control to be achieved within the existing hinge footprint without requiring separate mechanisms, thereby reducing the overall complexity increase that would result from adding a standalone clutch system.
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 design allows for easier closing of devices like kickstands or covers with reduced torque while maintaining higher opening resistance for stability, enhancing user convenience and device usability.
Implementation Method 1
frictional movement of the band about the shaft
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
A hinge includes a shaft, a hinge leaf engaged with the shaft, a band clamped around the shaft for rotation about the shaft and pivotal movement relative to the hinge leaf, and a clutch disposed between the band and the shaft. The clutch includes a collar disposed between the shaft and the band. The clutch is configured to lock and unlock the collar to the shaft. Rotation of the band about the shaft in a first direction locks the collar to the shaft for frictional movement of the band about the shaft at a first resistance level. Rotation of the band about the shaft in a second direction unlocks the collar from the shaft for frictional movement of the band about the shaft at a second resistance level lower than the first resistance level.