Door Security Apparatus for Classroom Locking
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Solution Overview
Problem
Classroom doors in schools often lack an effective locking mechanism from the inside, leaving students vulnerable to unauthorized entry during security incidents.
Innovation Solution
A door security apparatus comprising a door engagement member, a sleeve member with a locking system, and a spacer that temporarily locks a double-lever arm door closer by sliding over its arms and using a retaining device with elongated port engagement members and fasteners to restrict movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a door closer is installed to automatically close the door, then the door can be kept closed, but the door cannot be locked from the inside to prevent unauthorized entry
Solution Approach 1:
The sleeve member is disposed over the double-lever arms of the door closer, with the port engagement member nested within the sleeve member's port. This nested configuration allows the locking mechanism to be integrated with the existing door closer structure without requiring separate independent components, enabling interior locking capability while maintaining the door closer's automatic closing function
Solution Approach 2:
The port engagement member acts as an intermediary element that connects the sleeve member to the double-lever arms. When the port engagement member is positioned within the port of the sleeve member, it restricts the movement of the double-lever arms, thereby preventing the door from opening from the inside while allowing the door closer to remain functional
2Reliability
If a locking mechanism is added to prevent door opening from inside, then security is improved, but the device complexity increases
Solution Approach 1:
The sleeve member serves multiple functions: it guides the port engagement member, restricts the movement of the double-lever arms, and provides a port for securing the locking mechanism. The port engagement member simultaneously engages with both the sleeve member and the double-lever arms. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving reliable interior locking
Solution Approach 2:
The locking mechanism is divided into distinct segments: the sleeve member, the port engagement member, and the fastening system. This segmentation allows each component to perform its specific function independently while working together as an integrated system, making the overall mechanism easier to understand, install, and maintain compared to a monolithic locking device
Data Source
AI summary
A door security apparatus is disclosed herein. The door security apparatus comprises a sleeve member, a door engagement member and a spacer, and is configured to engage a double-lever arm door closer to allow for the locking of a door from the inside. The apparatus further comprises a locking mechanism for keeping the apparatus attached to the door closer. The door engagement member is configured to engage the top edge of a door, the sleeve member is configured to slidably engage the double-lever arm door closer, and the spacer is configured to connect the door engagement member and the sleeve member.