Multifunction Door Securing Mechanism with Internal Release
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Solution Overview
Problem
Existing door locking mechanisms do not allow users to open a locked door from the inside without a key, posing challenges for users who may be accidentally or intentionally locked in, particularly in roll-up doors.
Innovation Solution
A multifunction securing mechanism that includes a latching assembly with a rotatable member and latch, a key cylinder, and internal release mechanisms allowing the door to be opened from the inside without a key, featuring a lazy cam profile and pivotable handle assembly for secure and emergency release functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a key cylinder locking mechanism is used to secure the door, then the door can be locked securely from the outside, but the door cannot be opened from the inside without the key
Solution Approach 1:
The locking system is divided into two independent subsystems: an external key cylinder locking mechanism and an internal release mechanism. The key cylinder controls a latch through rotational motion, while the internal release mechanism provides a separate pathway for door opening from inside, segmented into distinct functional components that operate independently
Solution Approach 2:
A cam mechanism acts as an intermediary between the key cylinder rotation and the latch movement. The cam profile converts rotational motion of the key cylinder into linear motion of the latch, enabling the latch to be moved by either key rotation or internal release mechanism activation
2Ease of operation
If a simple latch mechanism is used, then the door can be opened easily from the inside, but the door cannot be securely locked when the key cylinder is locked
Solution Approach 1:
The patent merges a simple latch mechanism with a key cylinder locking system. The latch mechanism that can be easily operated from inside is combined with the external key cylinder, creating a unified system where both simple internal operation and secure external locking coexist through the shared cam-latch interface
Solution Approach 2:
The latch mechanism serves multiple functions: it can be moved by key cylinder rotation for secure locking, activated by the internal release mechanism for easy opening from inside, and positioned to either engage with or clear the catch depending on the operational requirement
Data Source
AI summary
A multifunction securing mechanism for a compartment closable by a door and includes a key cylinder, a latching assembly which may be a two-point latching assembly movable between a latching and an unlatching position, a rotatable member configured for a lazy-cam function connecting the key cylinder and latching assembly, at least one catch located on a surface adjacent the outside of the door, and a bar pivotally mounted to the outside of the door and movable between a first closed position and a second opened position. A first release mechanism is located on an interior side of the door for changing a positon of the latching assembly, and a second release mechanism is located on the interior side of the door for changing a position of the bar, both for allowing a user to open a latched and secured door from the inside.