Door Lock Secondary Bolt Mechanism
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Solution Overview
Problem
Existing door locking systems can be vulnerable to unauthorized access when intruders use methods such as 'lock snapping' or applying a blow torch to disable the cylinder lock, especially when the door is locked from the inside, posing a risk to homeowners and their property.
Innovation Solution
A secondary lock system is integrated into the door locking mechanism, featuring a bolt and activating mechanism that can be actuated to engage with the locking system's moving parts, preventing the door from being opened even if the cylinder lock is defeated, with the bolt being accessible from the inside for quick operation and featuring a drive rail and lug configuration for enhanced resistance to shear and bending forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a secondary lock is added to the door locking system, then security against intruder attacks is improved, but device complexity increases
Solution Approach 1:
The locking system is segmented into two independent locking mechanisms: a primary lock (cylinder lock with cam and handle) and a secondary lock (bolt with activating mechanism). Each lock operates independently, so if the primary lock is defeated, the secondary lock remains functional. This segmentation provides redundancy and maintains security even when one locking mechanism fails.
Solution Approach 2:
The secondary lock acts as a pre-prepared backup security measure. The bolt is positioned in advance within the locking mechanism, ready to engage if needed. The system anticipates potential failure of the primary lock and has the secondary lock ready to prevent door opening, cushioning against the security risk before it materializes.
2Ease of operation
If the bolt is made accessible from the inside for quick operation, then ease of operation is improved, but security vulnerability increases
Solution Approach 1:
The activating mechanism for the secondary lock is located on the inside of the door, providing easy access for authorized users. The bolt itself extends through the door structure, with its activation point accessible from inside but its locking engagement occurring at multiple points. This localized accessibility maintains security by keeping the critical locking function hidden while allowing easy operation from the secure side.
Solution Approach 2:
The activating mechanism serves as an intermediary between the user and the bolt. Users interact with the activating mechanism (which can be a simple lever, button, or interface) rather than directly manipulating the bolt itself. This intermediary provides a user-friendly interface while maintaining the structural integrity and security of the locking system.
3Reliability
If the bolt engages with moving parts of the locking mechanism, then reliability is improved, but device complexity increases
Solution Approach 1:
The secondary lock's bolt is integrated with the existing moving parts of the locking mechanism. Rather than creating a completely separate system, the bolt engages with the cam, handle, or other moving components that are already part of the door assembly. This merging approach adds redundancy while utilizing existing structural elements, minimizing the increase in overall complexity.
Solution Approach 2:
The bolt serves multiple functions: it acts as a secondary locking element, engages with existing moving parts to prevent their operation, and can be integrated with the drive rail system. By making the bolt multi-functional and compatible with existing mechanism components, the system achieves enhanced reliability without proportionally increasing complexity.
Data Source
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AI summary
There is provided a door lock system including a handle assembly and a secondary lock. The secondary lock is attachable to an inside of a door or door frame. The handle assembly is attachable to the door and is substantially in accordance with known handle assemblies, and includes a locking mechanism. The locking mechanism includes an internal mechanism and a bolting system that has one or more moving parts to engage and disengage the bolting system. The secondary lock comprises a bolt and activating mechanism, wherein the activating mechanism can be actuated to engage the bolt with one of said moving parts of the locking mechanism. Here, the actuating mechanism has a reset position, wherein the bolt is restrained clear of the moving part, such that the handle assembly is normally operable, and an engaged position, wherein the bolt is engaged with the moving part such that engagement between the bolt and moving part prevents the moving part from moving. Thus, when the secondary lock is actuated to the engaged position, the handle assembly remains locked even when a cylinder lock that operationally locks and unlocks the locking mechanism is defeated.