Door Knob Securing Plate for Intrusion Prevention
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Solution Overview
Problem
Existing solutions for securing classrooms or enclosed areas against unauthorized entry often require significant modifications to door structures, additional components, or multiple actions to engage and disengage, which do not comply with fire safety standards that demand easy evacuation.
Innovation Solution
A door securing plate mounted on a doorknob that rotates and extends beyond the door edge, captured by a catch device and slot in the door frame, allowing single-action engagement and disengagement to secure or open the door, ensuring compliance with fire safety requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a door securing device is added to prevent unauthorized entry, then security against intrusion is improved, but the complexity of the door system increases
Solution Approach 1:
The securing plate is mounted within the existing door knob assembly, nesting the new security function inside the existing door hardware. The plate rotates on the knob shaft and stores within the door thickness, avoiding external additions that would increase system complexity.
Solution Approach 2:
The door knob is given multiple functions: it continues to operate as the primary door opening mechanism while simultaneously serving as the mounting and actuation mechanism for the securing plate. This eliminates the need for separate actuators or control systems.
2Reliability
If a door securing device is installed to prevent unauthorized entry, then security against intrusion is improved, but modifications to door or building structure are required
Solution Approach 1:
The securing plate and catch mechanism are nested within the existing door structure - the plate mounts to the knob shaft, the catch engages with the frame, and the securing slot is cut in the frame. This avoids external attachments or structural modifications beyond the slot cut.
Solution Approach 2:
The door knob itself serves as the mounting structure for the securing plate, using its existing shaft and mounting holes. The door frame provides the catch engagement point, utilizing the existing frame structure rather than requiring separate mounting surfaces.
3Reliability
If a door securing device is added to secure the doorway, then security against intrusion is improved, but the time required to engage and disengage the door increases
Solution Approach 1:
The securing plate rotation and the door knob operation are merged into a single action. Rotating the knob to unlock the door simultaneously rotates the securing plate out of the catch engagement, combining door opening and security release functions.
Solution Approach 2:
The securing plate is pre-positioned on the knob shaft during installation, and the catch is pre-positioned in the frame. When the door is locked, the plate automatically engages the catch. No additional actions are needed to engage security - it happens automatically when the door is locked.
4Reliability
If a door securing device is installed to prevent unauthorized entry, then security against intrusion is improved, but the ease of operation for evacuation decreases
Solution Approach 1:
The evacuation function is merged with the normal door opening operation. The same knob rotation that opens the door for authorized entry also releases the securing plate from the catch, enabling emergency evacuation without additional actions.
Solution Approach 2:
Instead of requiring a separate action to release security during evacuation, the system is designed so that the natural door opening action (rotating the knob) automatically releases both the latch and the securing plate. The inversion is that the securing mechanism is passively released by the door opening motion rather than requiring active release.
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 solution provides enhanced security by preventing unauthorized entry with a single movement while allowing easy evacuation in emergencies, adhering to fire safety standards without modifying the door or building structure.
Implementation Method 1
the rotation of the plate may be restricted by frictional interference between the shaft and the plate such that the plate will remain stationary with respect to the door to which it is attached
Data Source
AI summary
The present invention is a system and method which comprises a rotating securing plate mounded on a door knob which engages a door frame to facilitate quickly securing a door to a door frame to protect the occupants of a room from an intruder. The system comprises a rotating stop in the doorknob which allows a user to open the door from within the secured room with a minimum of movements and time in the event of a dangerous situation in the room such as fire or other hazards. Through the use of an opening in the door frame, embodiments of the invention are equally applicable to doors that open inwardly and outwardly relative to an area to be secured.