Bolt Face Indicator for Low-Light Latch Verification
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Solution Overview
Problem
Existing exit devices make it difficult for security personnel to accurately determine if the latchbolt is extended to secure the door in its closed position, especially in low-light conditions, necessitating improvements for enhanced visibility.
Innovation Solution
An access control device with a bolt featuring a visible indicator on its front face, which provides visual contrast or reflective properties to indicate the extended position of the latchbolt, enhancing visibility in various lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If no indicator is provided on the bolt, then the device structure remains simple, but security personnel cannot accurately determine whether the latchbolt is extended in low-light conditions
Solution Approach 1:
The indicator is provided on the front face of the bolt to provide visual contrast or reflective properties that change or stand out in low-light conditions, enabling security personnel to accurately determine the latchbolt's extended position without increasing complex mechanical structures
Solution Approach 2:
The indicator acts as an intermediary element between the latchbolt and security personnel, providing visual information about the bolt's position without requiring personnel to directly observe or approach the exit device
2Measurement precision
If security personnel approach the exit device to verify door security, then they can confirm the latchbolt position, but this increases time loss and potential security risks
Solution Approach 1:
The indicator provides immediate visual feedback about the latchbolt's position to security personnel from a distance, eliminating the need to approach the exit device for verification and reducing time lost during facility tours
Solution Approach 2:
The system serves itself by providing self-indicating visual cues that automatically communicate the door's locked status without requiring human intervention or close inspection
Data Source
AI summary
An exemplary access control device is configured for mounting to a door and includes a bolt, an actuator, and an indicator. The bolt has an extended position and a retracted position, and includes a front face that is visible when the bolt is extended and the door is in a closed position. The actuator is operable to move the bolt from the extended position to the retracted position. The indicator is positioned on the front face of the bolt such that at least a portion of the indicator is visible when the bolt is extended and the door is in the closed position.