Linear Actuator Manual Override and Position Indicator
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Solution Overview
Problem
Existing linear actuators lack a reliable mechanism for providing clear visual indication of actuation state and efficient manual operation when powered off, limiting user control and visibility of actuation positions.
Innovation Solution
A linear actuator design incorporating a support with a movable output member, an automatic driver using a wax motor, and a manual driver with a rotatable input member and linking collar, allowing for interlocking engagement to inhibit rotation and permit axial movement, while an indicator member provides visual feedback on actuation position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a linear actuator uses an automatic driver with an external power source to drive movement of the output member, then the actuator can perform automated actuation functions, but the actuator loses the ability to operate when the power source is cut off
Solution Approach 1:
The actuator system changes its operational mode by switching between automatic driver (electrically powered) and manual driver (mechanically powered) based on power availability. The manual driver is engaged when electrical power is cut off, allowing the system to adapt to different operational conditions and maintain functionality.
Solution Approach 2:
A selector mechanism serves as an intermediary between the automatic driver and manual driver, enabling the system to switch between two power sources. This intermediary component allows the actuator to access either automated or manual operation modes depending on the operational context.
2Adaptability or versatility
If the actuator includes both automatic and manual drivers, then the actuator can operate in both automated and manual modes, but the device complexity increases
Solution Approach 1:
The actuator system is designed with multi-functionality by incorporating both an automatic driver and a manual driver within a single device. This allows the actuator to perform both automated and manual operations, making the system versatile and adaptable to different operational requirements without requiring separate devices.
Solution Approach 2:
The automatic driver and manual driver are merged into a single integrated actuator system with a common output member and selector mechanism. This combination allows both driving mechanisms to coexist and interact through a unified structure, reducing the overall complexity compared to having separate independent systems.
3Loss of information
If an indicator is provided to show the actuation position of the output member, then the visual indication of actuation state is improved, but the indicator may be concealed by the support structure
Solution Approach 1:
The indicator is positioned in a specific spatial dimension relative to the support structure, allowing it to be visible from certain external vantages while concealed from others. This dimensional positioning enables the indicator to provide visual information when needed while being protected or hidden when not in use, optimizing both visibility and structural integration.
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 clear visual indication of actuation state and allows for efficient manual operation with minimal force, ensuring the actuator can function both automatically and manually, maintaining visibility of the actuation position through the manual input cap.
Implementation Method 1
some linear actuators use electrically powered wax motors to drive movement of a piston assembly along an actuation axis
Implementation Method 2
A linking member is threadably engaged with the manual input member for movement relative to the manual input member along the actuation axis when the manual input member is rotated relative to the linking member about the axis
Data Source
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AI summary
A linear actuator switchable between automatic and manual modes (independently of normal functionality) having an output member movably mounted on a support. The output member is selectively movable relative to the support through a range of motion including an actuating position and a non-actuating position. An indicator constrained for movement with the output member is positioned so that it is visible when the output member is in one of the actuating position and the non-actuating position and concealed by the support from the vantage when the output member is in the other of the actuating position and the non-actuating position. The actuator further includes manual input member rotatably mounted on the support for selective rotation about an actuation axis. A linking member is threadably engaged with the manual input member for movement along the axis when the manual input member is rotated for manually moving the output member relative to the support.