Deadbolt Lock Security Device with Pivotable Intermediary
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Solution Overview
Problem
Existing deadbolt door locks lack a mechanism to prevent unauthorized access when duplicate or stolen keys are used, posing a security risk for individuals and property owners.
Innovation Solution
A security device comprising a base member secured to the interior face plate of a deadbolt lock and a pivotable lock member that prevents the lever from moving from the locked to the unlocked position unless the lock member is in the open position, allowing for secure locking and unlocking while providing a convenient key holder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a deadbolt lock is secured with a standard key mechanism, then the lock can be easily unlocked with the correct key, but unauthorized access becomes possible if duplicate or stolen keys are used
Solution Approach 1:
The patent introduces an intermediary mechanical lock member between the key cylinder and the deadbolt mechanism. This lock member acts as a mediator that must be manually engaged after key insertion, preventing direct transmission of the unlocking action to the deadbolt. The intermediary mechanism ensures that even if a duplicate key is used to rotate the cylinder, the deadbolt remains locked unless the additional manual lock member is activated.
2Reliability
If a security device is added to prevent unauthorized key access, then security against rogue keys is improved, but the device complexity increases
Solution Approach 1:
The patent combines the security function with the existing deadbolt lock structure by integrating the additional lock member into the same housing and faceplate assembly. The lock member shares the same mounting structure and operational space as the original lock components, merging multiple security functions into a single integrated device rather than adding a separate independent mechanism.
Solution Approach 2:
The patent segments the unlocking function into two distinct stages: first, the key cylinder rotation to release the locking mechanism, and second, the manual activation of the lock member to actually disengage the deadbolt. This segmentation separates the key authentication function from the bolt release function, allowing the security enhancement to be added without completely redesigning the original lock mechanism.
3Reliability
If a manual lock member is added to the deadbolt mechanism, then unauthorized access prevention is improved, but the ease of operation for legitimate users is reduced
Solution Approach 1:
The lock member is designed to be self-contained and self-operating within the lock assembly. Once the key successfully rotates the cylinder and releases the locking mechanism, the lock member can be manually activated by the user through a simple motion that is integrated into the existing operational flow. The mechanism serves itself by using the key cylinder's movement to prepare and enable the lock member's activation, rather than requiring separate complex control systems.
Data Source
AI summary
Disclosed is a security device for securing a deadbolt door lock having an interior face plate and a lever movable between a locked position and an unlocked position. The security device includes a base member configured to be secured to the interior face plate of the deadbolt lock, and a lock member pivotably secured to the base member so that the lock member pivots between an open position and a closed position. The lock member is configured to prevent movement of the lever from the locked position to the unlocked position when the lock member is in the closed position and to permit movement of the lever from the locked position to the unlocked position when the lock member is in the open position.