Aerospace Door Handle Mechanism Visual Position Indication
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Solution Overview
Problem
Aerospace door handles lack an efficient mechanism for indicating the position of external handles relative to internal handles, and existing solutions do not provide a clear visual indication of the handle's position, which can complicate operation and safety.
Innovation Solution
A handle mechanism incorporating a gear drive, inside handle, button, outside handle, and spring, where the button is slidably movable along the gear drive, and the outside handle is rotatable about a pin, with a visual indication provided by the button's protrusion when in the second position, allowing for clear differentiation between open and closed positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a handle mechanism is used for aerospace doors, then the door can be opened and closed, but there is no clear visual indication of the handle's position relative to the door
Solution Approach 1:
The patent introduces an intermediary indicator mechanism that mediates between the handle position and the visual indication. The indicator is coupled to the handle through a linkage system that translates handle movement into visible position changes, providing clear feedback without requiring direct observation of the handle's exact location
Solution Approach 2:
The patent employs color changes or visual differentiation on the indicator to show handle position. The indicator may change color, orientation, or visibility state to clearly distinguish between different handle positions, making the information immediately apparent to the user
2Reliability
If the outside handle is positioned within the niche, then it is constrained from rotation, but it is difficult to distinguish whether the door is open or closed
Solution Approach 1:
The patent implements a feedback mechanism where the indicator continuously reflects the handle's position state. When the handle moves to indicate open or closed position, the indicator provides immediate visual feedback, allowing the user to confirm the door's state without ambiguity
Solution Approach 2:
The indicator mechanism is segmented into distinct positional states that correspond to different handle positions. The indicator can be in one of several discrete positions or orientations, each clearly indicating a specific door state, making it easy to distinguish between open and closed conditions
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 mechanism ensures clear visual and operational distinction between open and closed positions, enhancing user safety and ease of operation by providing a clear visual indication through the button's protrusion when the handle is in the second position.
Implementation Method 1
The spring is attached to the button so as to bias the button toward the first position of the button. The spring is attached to the outside handle so as to bias the outside handle toward the first position of the outside handle.
Implementation Method 2
The gear drive has an interior end, an exterior end opposite the interior end, a longitudinal axis extending from the interior end to the exterior end, a peripheral surface, and a gear formed within the peripheral surface.
Data Source
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AI summary
A handle mechanism (10) includes a gear drive (34) having an interior end (36) and an exterior end (38); an inside handle (32) fixed to the interior end (36); a button (56); a finger (50); a handle drive (48); an outside handle (22); and a spring (54). The button (56) has an interior end (58) and an exterior end (60), which is positioned within the exterior end (38) of the gear drive (34). The handle drive (48) is positioned within the exterior end (38) of the gear drive (34) and is rotatable relative thereto. The outside handle (22) and the handle drive (48) rotate together. The outside handle (22) moves between a first position, wherein it is constrained from rotation, and a second position. The finger (50) is fixed to the exterior end (60) of the button (56), which moves between a first position, wherein the finger (50) causes the gear drive (34) and the handle drive (48) to rotate together, and a second position. The spring (54) biases the button (56) and the outside handle (22) toward their first positions.