Anti-fire Door Lock Blocking Structure for Fire Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional anti-fire door locks fail to maintain the fire-excluding function when the latch displaces due to temperature elevation during a fire, causing the blocking surface to lose contact with the blocking base, allowing the door to open inadvertently.
Innovation Solution
A blocking structure featuring a latch set with a pivoting portion and a blocking portion containing an accommodating hole for a blocking pin, which is pushed by an elastic member to move into a constraining slot in the blocking base, ensuring the latch remains engaged and preventing the door from opening during a fire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the latch set is mounted on the anti-fire door without additional constraining mechanisms, then the device complexity is reduced, but the reliability of maintaining the fire-excluding function during fire accidents deteriorates due to latch displacement
Solution Approach 1:
The blocking pin is divided into two constraining portions: a first constraining portion that engages with the latch set and a second constraining portion that engages with the blocking base. This segmentation allows the blocking pin to independently constrain both components, preventing relative displacement while maintaining structural simplicity
Solution Approach 2:
The blocking pin acts as an intermediary component between the latch set and the blocking base. It mediates the connection between these two components, ensuring they remain relatively constrained during fire accidents without requiring direct integration or complex coupling mechanisms
2Reliability
If the blocking pin is constrained only in the accommodating hole, then the ease of operation is improved, but the reliability deteriorates when temperature elevation causes latch displacement during fire accidents
Solution Approach 1:
The blocking pin is designed to dynamically adjust its position: it can swing freely within the accommodating hole during normal operation for ease of engagement, but when temperature elevation occurs during fire accidents, the elastic member pushes the blocking pin to swing toward the constrained opening, causing the second constraining portion to engage with the blocking base for reliable constraint
3Reliability
If the blocking pin is pushed by elastic member toward the constrained opening, then the fire-excluding function is improved during fire accidents, but the device complexity increases due to additional components
Solution Approach 1:
The elastic member is pre-loaded within the accommodating hole to automatically push the blocking pin toward the constrained opening when temperature elevation occurs during fire accidents. This self-service mechanism responds autonomously to thermal conditions without requiring external control systems or additional complex components
Solution Approach 2:
The elastic member changes its physical state in response to temperature elevation during fire accidents. The thermal energy causes the elastic member to expand or increase its restoring force, which pushes the blocking pin to swing and engage the second constraining portion with the blocking base, thereby adapting the blocking mechanism to fire conditions
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
The blocking pin effectively constrains the latch set to the blocking base, maintaining the fire-excluding function by using elastic restoration force to lodge the blocking pin into the constraining slot, preventing the anti-fire door from opening during elevated temperatures.
Implementation Method 1
the first constraining portion of the blocking pin compresses the elastic member to make the elastic member produce an elastic restoration force when the blocking pin is located at a first position
Data Source
AI summary
A blocking structure of an anti-fire door lock includes a latch set, a blocking pin set and a blocking base, wherein the latch set comprises a lock base and a latch that pivotally connected to the lock base. The blocking pin set disposed in an accommodating hole of the latch comprises a blocking pin and an elastic member, and the blocking base comprises a constraining slot. The elastic member is used for pushing the blocking pin to move and making the blocking pin to lodge into the constraining slot to prevent an anti-fire door from being opened.