Deadbolt Lock Anti-Rotation Arm and Stabilizing Detents
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Solution Overview
Problem
Deadbolt locks face vulnerabilities such as rotation attacks and key cylinder removal attempts, which compromise their integrity and security, and users may inadvertently loosen the thumbturn, leading to potential failure.
Innovation Solution
The lock assembly incorporates an anti-rotation arm to prevent chassis rotation, secures the key cylinder within the chassis to prevent removal, and uses stabilizing detents on the thumbturn to reduce wobble and enhance user feedback, with a motor-driven mechanism for secure operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the key cylinder is installed in the chassis, then the lock can be operated with a key, but the key cylinder can be removed by attack compromising lock integrity
Solution Approach 1:
The key cylinder is nested within the chassis housing, which provides structural protection and prevents direct access for removal. The key cylinder body is received within the key cylinder bore of the chassis, creating a nested configuration that secures the key cylinder while maintaining operational access.
Solution Approach 2:
The lock assembly uses a composite structure combining the key cylinder, chassis, and lock pin cover as integrated components. The substantially rectangular lock pin cover disposed along the top of the key cylinder body creates a composite assembly that strengthens the overall structure and prevents key cylinder extraction while maintaining key operation capability.
2Reliability
If the chassis is made secure to prevent rotation attacks, then lock integrity is improved, but the device complexity increases
Solution Approach 1:
The chassis is segmented into functional zones: the key cylinder bore for key insertion, the anti-rotation arm for security, and the lock pin cover for structural integrity. This segmentation allows each component to address specific security requirements independently, preventing rotation attacks without requiring complete redesign of the entire chassis structure.
Solution Approach 2:
The anti-rotation arm acts as an intermediary element between the chassis and the door, physically preventing rotation attacks by abutting against the door or frame. This intermediary component provides rotation resistance without requiring the entire chassis to be overly complex, as only the anti-rotation arm needs to engage with the external structure.
3Ease of operation
If the thumbturn is made loose-free for easy operation, then ease of operation is improved, but the thumbturn may inadvertently loosen leading to failure
Solution Approach 1:
The stabilizing detents modify the mechanical parameters of the thumbturn by introducing controlled engagement points. The detents create discrete positional states that provide tactile feedback to the user while preventing excessive play or inadvertent loosening. This changes the thumbturn from a completely free-rotating component to one with controlled movement parameters.
Solution Approach 2:
The stabilizing detents provide tactile feedback to the user during thumbturn operation. As the thumbturn rotates, the detents engage and disengage at specific positions, giving the user sensory feedback about the thumbturn's position and movement. This feedback mechanism allows users to operate the thumbturn easily while knowing when it is properly engaged, preventing inadvertent loosening.
Data Source
AI summary
A deadbolt lock assembly is disclosed. The deadbolt lock assembly includes an exterior lock mechanism and an interior lock mechanism mechanically connected through a bored hole in a door. The exterior portion of the lock assembly includes a reinforced chassis with a reinforced lock cylinder bore and an anti-rotation arm to enhance the lock's resistance to attack. The interior portion includes a thumbturn that is physically connected to the gearbox frame for robustness and includes stabilizing detents to improve the user feel. The gearbox frame and mounting bracket are connected with a single screw and spring-loaded latch for ease of assembly.