Mechanical Door Security Device for Crash Bar Lockout
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Solution Overview
Problem
Existing security devices for high-occupancy buildings, such as crash bars with magnetic or electronic locking mechanisms, are ineffective during power outages or when disabled by intruders, failing to prevent unauthorized access, which compromises the safety of occupants.
Innovation Solution
A portable security device for doors featuring a metallic front bar and rail supports, integrated with door tabs that extend downward, providing resistance and requiring intruders to break glass or apply excessive force to open the doors, thereby delaying unauthorized entry and allowing occupants time to escape or seek shelter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If magnetic or electronic locking mechanisms are used in crash bars, then ease of operation is improved, but reliability deteriorates during power outages or when disabled by intruders
Solution Approach 1:
The patent extracts the locking function from the electronic/magnetic system and implements it through a purely mechanical override mechanism. The override key mechanism allows manual locking and unlocking independent of power or electronic systems, ensuring reliability during outages or when electronics fail.
Solution Approach 2:
The mechanical locking mechanism is designed to be self-operating through physical force. The override key can be inserted and turned manually to engage or disengage the locking mechanism without requiring external power, electronic control, or complex actuation systems.
2Reliability
If security officers are posted at key entry points to ensure lockdown, then reliability is improved, but cost increases significantly
Solution Approach 1:
The door security system performs the security function autonomously through its mechanical override mechanism. The override key provides a simple, reliable locking method that does not require human intervention, eliminating the need for security officers while maintaining reliability.
Solution Approach 2:
The patent uses a simple, inexpensive mechanical override key mechanism instead of expensive electronic systems and human security personnel. The mechanical system is cost-effective, reliable, and can be implemented without significant budget requirements.
3Ease of operation
If crash bars with magnetic locking systems are used, then ease of operation is improved, but reliability deteriorates when power is down or deliberately disabled
Solution Approach 1:
The patent removes dependence on magnetic or electronic locking systems by implementing a purely mechanical override mechanism. The mechanical lock can be engaged and disengaged through physical manipulation of the override key, ensuring functionality independent of power or electronic systems.
Solution Approach 2:
The mechanical override mechanism serves as a backup or cushioning measure that activates when electronic systems fail. The simple mechanical design ensures that if power is lost or electronics are disabled, the door can still be secured through the mechanical override key mechanism.
Data Source
AI summary
A door security device has a rail support including a top surface and a bottom surface. A door support is attached to the rail support, such that the door support extends vertically away from the rail support of the door security device. The door support is oriented at a normal relative to the rail support. The bottom surface of the rail support rests parallel to a surface of a rail of a crash bar when the bottom surface is situated adjacent the surface of the rail. The security device creates a rigid connection to prevent unwanted removal of the door from a closed position.