Fuel Drain Valve Tool That Holds Open Without Twisting
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Solution Overview
Problem
Aircraft fuel tank valves often require twisting, which can damage or break the protrusions, necessitating continuous force application or costly replacement, leading to operational inefficiencies and downtime.
Innovation Solution
A fuel drain engagement tool that transfers the responsibility of retaining the valve in the open position from the valve's protrusions to the tool itself, using a mechanism that engages with the valve to maintain it open without requiring twisting, thus preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operator twists the movable component to engage protrusions with the fuel tank contour, then the valve can be retained in the opened position, but the protrusions may become damaged or sheared off due to excessive torque
Solution Approach 1:
The tool acts as an intermediary device between the operator and the movable component. It engages with the receptacle to apply opening force and then uses its own retention mechanism (engagement features on the tool body) to hold the valve open, rather than relying on the fragile protrusions on the movable component. This transfers the retention function from the weak protrusions to the stronger tool structure.
Solution Approach 2:
The tool separates the opening function from the retention function. The pressing component handles the opening action by engaging the receptacle, while separate engagement features on the tool body handle the retention of the movable component in the opened position. This segmentation allows each feature to be optimized for its specific function without compromising the other.
2Ease of operation
If the operator applies continuous force to the movable component to keep it open, then the valve remains open for fuel drainage, but the operator's hand must be positioned in the path of draining fuel for protracted periods
Solution Approach 1:
The tool provides self-service retention functionality through its engagement features that automatically hold the movable component in the opened position once actuated. The biasing member continues to urge the movable component against the tool's engagement features, creating a self-sustaining open position without requiring continuous operator input or hand placement in the fuel drainage path.
3Adaptability or versatility
If the protrusions are made of deformable material like plastic, then they can engage with the fuel tank contour, but they may be sheared off if too much torque is applied
Solution Approach 1:
The tool serves as a mediator that eliminates the need for high-torque engagement of the plastic protrusions with the fuel tank contour. By providing its own retention mechanism through engagement features on the tool body, the system allows the protrusions to remain low-torque, deformable components that engage only with the receptacle, while the tool handles the retention function that previously required the protrusions to engage the fuel tank.
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 safe and efficient fuel drainage without risking damage to the valve components, reducing the need for continuous force application and minimizing downtime for maintenance.
Implementation Method 1
the movable component is biased towards the closed position by a biasing member. In a non-limiting example, the biasing member may include a spring
Data Source
Figure 1~2B
Figure 2C~3
Figure 4~6
AI summary
A fuel drain engagement tool and a method for draining fuel from a fuel tank are provided. In one example, a fuel drain engagement tool includes a housing (68). An engagement mechanism (22) is coupled with the housing (68) and extending upward therefrom. The engagement mechanism (22) is configured to engage a fuel drain valve and to move between a contracted state and an expanded state. A compression applicator (42) is coupled with the housing (68) and is positioned to engage the engagement mechanism (22) when the compression applicator (42) is compressed to apply a force to the engagement mechanism (22) that causes the engagement mechanism to move from the expanded state to the contracted state.