Passive Door Lock Blocking Element Mechanism
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Solution Overview
Problem
Passive door locks in double door systems are often not intuitive, leading to user confusion and compromised security, as users may mistakenly believe the door is locked when it is not.
Innovation Solution
A lock mechanism for inactive doors that includes a housing for a locking element from an active door, a slide with a drive bar connection element, and a blocking element that prevents movement from the locked to unlocked position, ensuring the passive door is properly secured before the user can actuate the thumbturn or key cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passive door lock mechanism is implemented with simple shoot bolts, then the door structure is simple and easy to manufacture, but the locking reliability is insufficient and users may be confused about whether the door is properly locked
Solution Approach 1:
The blocking element is positioned in advance to prevent the slide from moving to the unlocked position until the deadbolt has fully extended into the housing. This preliminary blocking action ensures that the door cannot be accidentally unlocked before proper engagement, thereby improving locking reliability without requiring complex additional mechanisms.
Solution Approach 2:
The blocking element acts as an intermediary between the deadbolt and the slide mechanism. It mediates the interaction by physically blocking the slide's path of travel when the deadbolt is not properly engaged, providing a mechanical safeguard that enhances reliability while maintaining relatively simple overall structure.
2Reliability
If the blocking element prevents slide movement only when deadbolt is extended, then security is improved, but the operation sequence becomes more complex requiring users to understand specific steps
Solution Approach 1:
The blocking element automatically performs its function based on the deadbolt's position without requiring user intervention or understanding. The mechanism self-regulates by using the deadbolt's own extension motion to trigger the blocking action, making the security function autonomous and intuitive to operate.
Solution Approach 2:
The blocking element provides mechanical feedback about the locking state. When the deadbolt is properly extended, the blocking element moves out of the way, allowing the slide to move freely. When the deadbolt is retracted, the blocking element automatically returns to block the slide, providing intuitive tactile feedback to the user about the lock's state without requiring visual confirmation or complex procedures.
Data Source
AI summary
A lock mechanism for an inactive door includes a housing configured to receive a locking element from an active door lock. A slide is movably received in the housing and includes a drive bar connection element, wherein when the slide is in an unlocked position, the drive bar connection element is located in a path of travel of the deadbolt, and wherein when the slide is in a locked position, the drive bar connection element is located outside the path of travel of the deadbolt. At least one drive bar at least partially received in the housing and is connected to the drive bar connection element. The drive bar is actuated by an actuator located remote from the housing. A blocking element located within the housing, wherein the blocking element prevents movement of the slide from the locked position to the unlocked position.