Door Bolt Locking Mechanism for Double-Door Security
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Solution Overview
Problem
In double-door configurations, the inactive door's shoot bolt is often overlooked, leading to security vulnerabilities as it may not be engaged, allowing the active door to be locked without ensuring the inactive door is securely locked.
Innovation Solution
A shoot bolt lock assembly that includes upper and lower shoot shafts with spacers, detents, and spring levers, which prevent the active door from being locked unless both shoot bolts of the inactive door are engaged, ensuring the inactive door is locked first.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shoot bolt lock assembly is added to the inactive door, then security reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines the inactive door shoot bolt locking mechanism with the active door locking mechanism by making the active door lock inoperative unless the inactive door shoot bolt is engaged. This merging of functions ensures that both doors are locked together, improving security reliability without requiring separate independent locking systems.
Solution Approach 2:
The patent implements a preliminary action requirement where the inactive door shoot bolt must be engaged before the active door can be locked. This preliminary action ensures that the inactive door is secured first, preventing security vulnerabilities where the active door might be locked without the inactive door being secured.
2Reliability
If the shoot bolt engagement is made mandatory, then security is improved, but ease of operation deteriorates
Solution Approach 1:
The patent merges the locking operations of both doors into a single coordinated action. When the user engages the active door lock, the system automatically verifies that the inactive door shoot bolt is engaged, combining two security steps into one seamless operation that maintains ease of use while ensuring security.
Solution Approach 2:
The patent incorporates feedback mechanism where the active door locking system checks the engagement status of the inactive door shoot bolt. This feedback loop ensures that the active door can only be locked if the inactive door is properly secured, providing security assurance without requiring the user to manually verify both locks separately.
Data Source
AI summary
The present invention includes an apparatus for an active/inactive door system wherein an inactive door lock prevents the locking of an active door lock unless the inactive door lock is first engaged in a locking position. The active door lock includes a dead bolt and a lever for extensible locking engagement with a strike plate on the inactive door. The inactive door lock includes an upper and lower shoot bolt lock, each shoot bolt include a spring lever. Each spring lever is selectably biased against a back side of the strike plate in a first or second detent. The first detent is positioned on the strike plate such that when the corresponding spring lever is biased against in the first detent against a back side of the strike plate the corresponding dead bolt or latch bolt cannot be extended into engagement with the strike plate in a locking position.