Door Latch With Segmented Control For Secure Carding Prevention
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Solution Overview
Problem
Existing door latch systems lack a secure and convenient mechanism for quickly transitioning between locked and unlocked states, especially when separating protected and unprotected spaces, as they often require manual intervention and may not provide adequate security against unauthorized access from the unprotected side.
Innovation Solution
A lockable spring-biased latchbolt system with a separate movement element on the unprotected side, allowing the latchbolt to be moved to an open position without disturbing a locked control from the protected side, and a locking mechanism that can be operated from either side using a key or combination, ensuring secure and easy access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a spring-return latchbolt is used for easy door closing, then the door can be closed without manual intervention, but the latchbolt can be pushed back from the unprotected side compromising security
Solution Approach 1:
The door latch system is divided into two independent control elements: a first movement means on the protected side for normal door operation, and a second movement means on the unprotected side for security control. This segmentation allows the latchbolt to be controlled differently from each side, enabling easy closing from inside while preventing unauthorized opening from outside when locked
Solution Approach 2:
A separate second movement means acts as an intermediary between the unprotected side and the latchbolt. This intermediary element can only move the latchbolt to the opened position when the locking means is unlocked, providing a security layer that blocks direct access to the latchbolt from the unprotected side
2Reliability
If a deadbolt is used to prevent carding from the unprotected side, then security is improved, but manual intervention is required for each door closing
Solution Approach 1:
The system merges the advantages of both spring-return latchbolts and deadbolts into a single integrated mechanism. The spring-return feature enables automatic closing without manual intervention, while the locking means provides deadbolt-level security by preventing the second movement means from moving the latchbolt when locked
3Adaptability or versatility
If multiple holes are required in the door for mounting components, then more functionality can be provided, but the door structure becomes more complex and maintenance harder
Solution Approach 1:
The first and second movement means are designed to share a common mounting structure on the protected side of the door. This universal mounting approach allows both control elements to be installed through fewer holes, reducing door complexity while maintaining the versatility of having separate control mechanisms on both sides
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system provides quick and secure exiting from protected spaces, enhances security by making carding from the unprotected side as difficult as a deadbolt, and simplifies maintenance by mounting components on the protected side, reducing the number of holes required and improving access.
Implementation Method 1
a spring-biased latchbolt
Data Source
AI summary
A lockable spring-biased latchbolt in some embodiments of a door latch is manipulatable from a first side (protected side) of a door by translation to an opened-door position, and a separate element situated alongside the latchbolt is manipulatable from a second side (less protected side) of the door to contact and move the latchbolt to the opened-door position only if movement of that second element is not prevented by a locked position of a locking means. The locking means in these embodiments does not interfere with opening the door from the first side. The locking means can be changed back and forth between its locked position and its unlocked position by use of a key (or combination or code) from the second side of the door, and optionally from the first side of the door with or without the key (or combination or code).