Fire Door Lock with Three-Directional Latching Mechanism
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Solution Overview
Problem
Conventional fire door locking mechanisms lack horizontal latching or locking, making them vulnerable to being broken by targeting the middle portion of the door, thus requiring an enhancement in security while maintaining easy operation.
Innovation Solution
A fire door lock design featuring a base assembly with slidably mounted first and second slide blocks, a locking control assembly with a movable seat and tongue control plate, and a winglet assembly with rotatably coupled winglets, which, when actuated by a handle bar, withdraws latch bars to unlock the door and automatically returns to a locked position upon closure, providing three-directional locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fire door locking mechanisms with only upper and lower locking are used, then the structure is simpler, but the door is vulnerable to breaking at the middle portion
Solution Approach 1:
The locking mechanism is divided into three independent locking points: upper locking mechanism, lower locking mechanism, and middle locking mechanism. Each mechanism can operate independently to provide comprehensive security coverage along the door height, preventing both forced entry and door breaking attacks.
Solution Approach 2:
The patent transitions from a two-dimensional locking system (upper and lower only) to a three-dimensional locking system by adding the middle locking mechanism along the vertical dimension. This creates a distributed locking pattern that covers the entire door height, making forced entry significantly more difficult.
2Reliability
If multiple locking mechanisms are added to prevent door breaking, then security is improved, but the operation complexity increases
Solution Approach 1:
The upper, lower, and middle locking mechanisms are merged into a single integrated system controlled by one operating handle bar. When the handle bar is operated, all three locking mechanisms are simultaneously actuated through a transmission mechanism, allowing the user to lock or unlock all three points with a single action.
Solution Approach 2:
The single operating handle bar serves multiple functions: it controls the upper locking mechanism, the lower locking mechanism, and the middle locking mechanism simultaneously. This multi-functional design eliminates the need for separate controls for each locking point, maintaining ease of operation while providing comprehensive security.
3Reliability
If a transmission mechanism is used to coordinate multiple locking mechanisms, then simultaneous locking is achieved, but the device complexity increases
Solution Approach 1:
The transmission mechanism uses a nested structure where the operating handle bar connects to a central control component, which in turn connects to all three locking mechanisms through shared transmission elements. This nested arrangement allows coordinated control of multiple locking points while minimizing the total number of independent mechanical components.
Data Source
AI summary
A fire door lock includes a base assembly including first and second slide blocks, a locking control assembly including a movable seat forming a groove and a tongue control plate movably mounted to one side of the locking control assembly, and a winglet assembly including first and second winglets both having a boss movably received in the groove of the movable seat and both being respectively and rotatably coupled to the first and second slide blocks. Thus, when the movable seat is driven by a handle, the movable seat moves the first and second slide blocks to withdraw first and second latch bars to unlock the fire door and when the fire door is closed, the tongue control plate is actuated to allow the movable seat to return to the locked condition and the first and second latches and a tongue are stretched out to realize three-directional locking.