Vehicle Hatch Visual Contrast Signaling for Locked State
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Solution Overview
Problem
Railway vehicle access hatches lack effective visual indicators for ensuring they are locked, compromising safety due to handles being difficult to see when protruding, and existing solutions do not provide sufficient contrast for reliable visual monitoring.
Innovation Solution
A vehicle access hatch design featuring a main signaling region visible only when the hatch is closed and unlocked, with high contrast colors using the HSL model, and an additional secondary signaling region to enhance visibility, implemented through a colored coating or film on the shutter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If handles protrude from the hatch body to indicate unlocked state, then the locking status can be indicated, but the handles become difficult to see compromising safety
Solution Approach 1:
The patent applies color changes by introducing a main signaling region with high color contrast relative to the frame and shutter. This region changes its visibility based on the locking state: visible when unlocked, invisible when locked. The high contrast color ensures the signaling region is easily detectable from a distance, solving the visibility problem while maintaining safety.
2Reliability
If a locking system with protruding handles is used, then the hatch can be securely locked, but the visual indication of unlocked state becomes insufficient
Solution Approach 1:
The patent segments the shutter into functional regions: a main signaling region with high color contrast for visual indication, and a secondary signaling region with lower contrast for additional indication. This segmentation allows different parts of the shutter to serve different visual functions, ensuring both security and clear visual communication of the locked state.
Solution Approach 2:
The main signaling region uses high color contrast to provide clear visual indication of the unlocked state. The color contrast between the signaling region and the frame/shutter is significantly higher than the contrast between the frame and shutter, making the unlocked state immediately recognizable from a distance.
3Loss of information
If high color contrast is used for the main signaling region, then visibility of unlocked state is improved, but the complexity of the coloring system increases
Solution Approach 1:
The patent implements color changes through a main signaling region with high color contrast and a secondary signaling region with lower contrast. The color contrast between the main signaling region and the frame/shutter is significantly higher, providing clear visual indication while maintaining a relatively simple implementation through standard coloring techniques.
Data Source
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AI summary
Vehicle access hatch (6) (1), comprising: - a frame (8) defining an opening, and - a flap (12) movable relative to the frame (8), between - an open position, - a locked closed position in which the flap (12) completely closes the opening, and - an unlocked closed position in which the flap (12) completely closes the opening, the outer face (19) of the flap (12) being offset from the outer face (15) of the frame (8). The flap (12) has a main marking region that is visible from outside the access hatch (6) in the unlocked closed position and not visible from outside the access hatch (6) in the locked closed position. The contrast between the color of the main marking region and the color of the outer faces (15, 19) of the frame (8) and the flap (12) is high.