LCD Deployment Mechanism Using Spring Motor and One-Way Bearing
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Solution Overview
Problem
Current video players for aircraft, railway, vehicle, and ship entertainment systems fail to efficiently deploy and retract LCDs at specified angles, especially during power outages or external forces, leading to safety concerns and complex maintenance.
Innovation Solution
A device with a servomechanism comprising a gear motor, one-way bearing, electromagnetic clutch, speed reducer, and plane four-bar linkage mechanism, along with position and angle sensors, that automatically deploys and retracts the LCD using a spring motor for energy storage and release, ensuring safe operation and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple physical construction or energization method is used for deploying and retracting LCD, then the device structure is simpler, but the reliability is insufficient especially during power outage or unexpected exceptions
Solution Approach 1:
The spring motor is pre-loaded and stores elastic potential energy during the deploying phase, so that when power is lost or an exception occurs, the stored energy can immediately drive the LCD to retract without requiring additional power or control signals. This preliminary energy storage action ensures reliable automatic retraction under emergency conditions.
Solution Approach 2:
The system uses the one-way bearing to automatically lock the LCD in its deployed position without requiring continuous power, and the spring motor automatically drives retraction when power is lost. These self-service mechanisms eliminate the need for active power consumption to maintain position and ensure automatic safety retraction, improving reliability while maintaining simple structure.
2Ease of operation
If the LCD is always deployed for video playing, then the ease of operation is improved, but the safety deteriorates due to potential accidental collisions and space occupation
Solution Approach 1:
The LCD deployment mechanism transitions from a static fixed position to a dynamic adjustable position. The one-way bearing allows the LCD to be deployed and locked at a viewing angle during video playback, then automatically retracts to a flush position with the panel when not in use or during emergencies. This dynamic positioning provides both ease of operation during use and safety when retracted.
Solution Approach 2:
The LCD is extracted from the panel surface during video playback to provide viewing access, but can be taken back into the panel surface when not in use. This extraction and retraction capability allows the system to provide ease of operation when needed while eliminating safety hazards when the LCD is not actively being used.
3Object-affected harmful factors
If the LCD is retracted to save space and protect from collisions, then the safety is improved, but the ease of operation deteriorates during video playing
Solution Approach 1:
The one-way bearing is pre-configured to automatically lock the LCD in its deployed position once the gear motor completes the deployment rotation. This preliminary locking action eliminates the need for continuous power or active control to maintain the deployed state, allowing the LCD to remain easily accessible during video playback while automatically returning to the safe retracted position when power is lost or not needed.
4Productivity
If a gear motor and electromagnetic clutch system is used for deploying LCD, then the productivity is improved, but the device complexity increases and routine maintenance becomes difficult
Solution Approach 1:
The patent replaces complex electronic control systems with a mechanically simpler system using a gear motor, one-way bearing, and spring motor. The one-way bearing provides automatic mechanical locking without requiring electronic sensors or continuous power, and the spring motor provides passive energy storage. This mechanical substitution reduces device complexity and improves maintainability while maintaining high productivity for deploying and retracting operations.
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 device provides safe, energy-efficient, and automatic deployment and retraction of LCDs, addressing safety loopholes and simplifying maintenance by adjusting torque settings for various LCD sizes and external forces, ensuring reliable operation in diverse scenarios.
Implementation Method 1
an electromagnetic clutch, a speed reducer
Implementation Method 2
The electromagnetic clutch drives the spiral spring in the spring motor to store energy
Implementation Method 3
a one-way bearing dynamically connected to the gear motor
Data Source
Figure 1
Figure 2
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AI summary
Disclosed in the invention are a device for deploying and retracting liquid crystal display (LCD) and Control Method Thereof, including shafts connected to the LCD (1) and a servomechanism which drives the LCD on the shafts to deploy and retract. Wherein, the said servomechanism comprises a gear motor, a one-way bearing dynamically connected to the gear motor, an electromagnetic clutch, a speed reducer, and a plane four-bar linkage mechanism which drives the LCD on the said shafts to rotate. The said electromagnetic clutch is also connected to a spring motor which dynamically connects to the speed reducer. In the deploying and retracing direction of the said LCD, a stowed position transducer and a retracted position transducer are disposed to monitor the LCD position changes and an angle sensor to monitor the LCD deploying speed changes. The said stowed position transducer, retracted position transducer, and angle sensor are electrically connected to a controller. The controller collects and processes signals generated by the stowed position transducer, retracted position transducer, and angle sensor and controls LCD retracting in the event of power outage or unexpected exceptions.