Bullet-Resistant Access Control Trim and Shielded Deadlock Linkage
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Solution Overview
Problem
Access control devices are vulnerable to damage from projectiles, such as bullets, which can compromise their ability to maintain a locked position and facilitate unauthorized entry or exit.
Innovation Solution
The access control device incorporates a shield housing and armor bodies to protect critical components from projectile impacts, maintaining the latch bolt's orientation and delaying unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access control device uses standard components without protective shielding, then the device complexity is low and manufacturing is easier, but the reliability is reduced due to vulnerability to projectile damage
Solution Approach 1:
A shield housing is introduced as an intermediary component between the projectile threat and the critical control link assembly. The shield housing encompasses the control link assembly when the latch bolt is extended, protecting it from projectile damage while allowing operational movement when the latch is retracted.
Solution Approach 2:
The access control device is segmented into protected and unprotected zones. The control link assembly is isolated within the shield housing cavity, separating it from the external environment where projectile impacts occur, while the trim assembly and other components remain exposed.
2Ease of operation
If the main control link assembly is fully exposed for operational access, then the ease of operation is improved, but the object-affected harmful factors increase due to projectile vulnerability
Solution Approach 1:
The shield housing dynamically adjusts its protective coverage based on latch bolt position. When the latch bolt is extended (secured position), the shield housing encompasses the control link assembly for protection. When the latch bolt is retracted (unlocked position), the control link assembly is displaced out from the cavity, allowing operational access while minimizing exposure time to projectile threats.
3Strength
If armor bodies are integrated into the trim assembly, then the strength and resistance to projectile damage are improved, but the weight and manufacturing complexity increase
Solution Approach 1:
Armor bodies are selectively integrated only into specific high-risk areas of the trim assembly rather than the entire structure. This localized reinforcement provides projectile resistance where most needed (at the trim assembly level) while minimizing unnecessary weight addition across the entire device.
Data Source
AI summary
An access control device is provided for maintaining deadlocking features, even when the access control device is struck by a projectile discharged from a weapon. An exit device of the access control device can include at least one shield housing configured to retain the orientation of a main control link assembly in a manner that prevents deactivation of deadlocking capabilities. A trim assembly of the access control device can include at least one armor body, constructed of hardened steel, housed within a trim portion of the trim assembly. The armor body is positioned to at least minimize, and potentially prevent, damage to components such as the latch return spring caused by impact from the discharged projectile. Optionally, one or more armor bodies may also be mounted directly to the exit device, including, for example, on a baseplate, to provide further protection for components of the main control link assembly.