Valve Actuation Tool With Push-Then-Rotate Track Constraint
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Solution Overview
Problem
Non-metal water drain valves for aircraft fuel tanks are less robust and prone to damage due to incorrect operation, leading to costly replacements and potential fuel loss, as they lack the structural integrity of metal valves.
Innovation Solution
A tool with a shaft and body configuration that includes a track system and positive feature, preventing premature rotation by allowing force transfer only in alignment with the longitudinal axis, ensuring the valve is fully pushed inward before rotation, thus preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If non-metal water drain valves are used to reduce metal content in aircraft, then weight is reduced and compliance with FAA regulations is improved, but the valve becomes less robust and more prone to damage from incorrect operation
Solution Approach 1:
The patent introduces a specialized actuating tool as an intermediary between the operator and the non-metal valve. This tool includes a shaft with a positive feature (such as a cam or latch mechanism) that interfaces with the valve actuator. The tool mediates the operation by ensuring the valve is fully pushed inward along the longitudinal axis before allowing rotation, thereby protecting the fragile non-metal valve from damage while enabling its use
Solution Approach 2:
The tool design incorporates a track system with a first track section that is substantially parallel to the longitudinal axis of the shaft. This geometric constraint forces the operator to perform the preliminary action of pushing the valve inward completely before the shaft can be rotated. The positive feature on the shaft must traverse this linear track section first, ensuring proper sequencing of operations before the valve is actuated
2Device complexity
If a simple screwdriver is used to actuate the valve, then the operation is simple and device complexity is low, but premature rotation can occur causing valve breakage and damage
Solution Approach 1:
The tool employs a dynamic constraint system where the track geometry changes the degrees of freedom available to the shaft based on its position. When the positive feature is in the first track section (parallel to longitudinal axis), rotation is constrained. As the shaft moves along the track and the positive feature transitions to a second track section, rotational freedom is enabled. This dynamic control of mechanical freedom ensures reliable operation without excessive complexity
3Productivity
If the valve is rotated before being fully pushed inward, then the operator can quickly open the valve, but the valve becomes damaged or broken resulting in fuel loss and replacement needs
Solution Approach 1:
The tool design implements preliminary anti-action by using the track system to prevent the harmful action of premature rotation. The first track section, being parallel to the longitudinal axis, creates a mechanical constraint that actively opposes any rotation attempt until the valve has been fully pushed inward. This pre-emptive constraint protects the valve from damage before the operator can complete the actuation sequence
Data Source
AI summary
Various non-limiting embodiments of a tool for actuating a valve, a method for making a tool for actuating a valve, and a method for actuating a valve, are provided. In one example, the tool includes a shaft defining a longitudinal axis and configured to transfer force to the valve for actuating the valve. A body has a wall surrounding a portion of the shaft. The wall defines a track that is formed therein and that has a track section substantially parallel to the longitudinal axis. A positive feature is coupled to the shaft and disposed in the track. The shaft is slidingly coupled to the body and when a force is applied to the shaft in a direction aligned with the longitudinal axis, the shaft moves relative to the body and the positive feature moves through the track section that restricts the shaft from being rotated about the longitudinal axis.