Retractable Display Mechanism With Impact-Triggered Drive Disconnection
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Solution Overview
Problem
Conventional rollable display devices are prone to damage from external impacts due to the internal drive assembly being subjected to forces during accidental drops or similar events, affecting their normal operation and service life.
Innovation Solution
A retractable mechanism for display devices that switches to a disconnected state when the acceleration of the second housing exceeds a predetermined value, featuring a push rod and drive assembly design that separates from the drive assembly under impact, using catch bumps and ramped surfaces to manage the transition and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drive assembly is fixed in the first housing to enable smooth extension and retraction, then the operation smoothness is improved, but the drive assembly is vulnerable to damage during external impacts
Solution Approach 1:
The connection between the drive assembly and second housing is made dynamic rather than fixed. The movable portion can transition between a connected state (for smooth operation) and a disconnected state (for impact protection). This is achieved through the movable portion being able to move between being engaged with the drive assembly and being disengaged, allowing the system to adapt its connectivity based on operational conditions.
Solution Approach 2:
The mechanism prepares for potential impact damage by having the movable portion automatically disconnect from the drive assembly when acceleration exceeds a predetermined threshold. This preliminary protective action prevents the harmful impact forces from being transmitted to the drive assembly, thereby protecting it before actual damage can occur.
2Reliability
If the drive assembly is disconnected during impact, then the drive assembly is protected from damage, but the extension and retraction function is lost
Solution Approach 1:
The system dynamically adjusts its operational state based on detected conditions. During normal operation, the movable portion remains connected to enable smooth extension and retraction. During impact events, it automatically disconnects to protect the drive assembly. After impact, it can automatically reconnect to restore functionality, thus adapting between protection and operation modes as needed.
Solution Approach 2:
The mechanism incorporates acceleration detection capability that provides feedback about external impacts. When acceleration exceeds a predetermined threshold, this feedback triggers the movable portion to disconnect from the drive assembly. This closed-loop feedback system ensures the protective disconnection action is taken only when actually needed, preserving normal operation during regular use.
3Stability of the object's composition
If the movable portion is snap-fitted into the lock portion, then the connected state is stable, but the transition during impact requires overcoming the snap-fit force
Solution Approach 1:
The connection mechanism uses a dynamic snap-fit design where the movable portion can be engaged with the drive assembly during normal operation, providing stable connection. During impact, the excessive force naturally overcomes the snap-fit engagement, allowing automatic disconnection. The snap-fit provides stable operation when engaged but allows forced separation when sufficient external force is applied.
Data Source
AI summary
Provided is a retractable mechanism for a display device. The retractable mechanism includes: a first housing, a second housing, and a drive assembly, the first housing being movably connected to the second housing; wherein the drive assembly is disposed in the first housing and is connected to the first housing; the retractable mechanism has a connected state and a disconnected state, in the connected state, the second housing is connected to the drive assembly and is able to extend or retract relative to one side of the first housing under driving by the drive assembly, in the disconnected state, the second housing is separated from the drive assembly; and the retractable mechanism is configured to be switched from the connected state to the disconnected state in response to an acceleration of the second housing moving relative to the first housing being greater than a predetermined value.