Lock Status Indicator Mechanism for Hot-Door Emergency Access

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Solution Overview

Problem

Existing locks on passageway doors, especially in fire events, require manual operation to check the locking status, which can be dangerous due to high temperatures and delays emergency response.

Innovation Solution

A lock mechanism that visually indicates its locking or unlocking state through a window aligned with locking/unlocking indications, using interlocking components to prevent manual operation when locked and allow it when unlocked, ensuring safe and rapid confirmation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the operating device is used to check lock status during fire events, then the lock status can be confirmed, but the operating device becomes very hot causing scalding risk and manual operation is delayed

Engineering Contradiction:

Improvelock status confirmation reliabilityVSAvoidhigh temperature scalding risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces an indicating member as an intermediary element that visually displays the lock status (locked/unlocked) through different positions or colors. This mediator allows users to confirm lock status without directly touching the hot operating device, thereby eliminating the scalding risk while maintaining reliable status confirmation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical interaction (manual operation of the operating device) with an optical indication system. The indicating member provides visual feedback through its position or color changes, substituting the need for physical contact with the hot operating device, thus eliminating thermal harm while preserving status verification functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If manual operation is required to check lock status, then the lock status can be confirmed, but the checking speed is reduced affecting emergency response time

Engineering Contradiction:

Improvelock status confirmation reliabilityVSAvoidemergency response time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements a visual feedback mechanism through the indicating member that immediately displays the lock status without requiring manual operation. The indicating member's position or color provides instant feedback on whether the lock is locked or unlocked, enabling rapid status confirmation and significantly reducing emergency response time while maintaining reliable status verification.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces the time-consuming manual operation with an instantaneous optical indication system. The indicating member provides immediate visual feedback on lock status, eliminating the delay associated with manual checking and enabling rapid decision-making during emergencies.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12624572B2Lock capable of showing locking or unlocking state

Publication Date: 2026.05.12 I TEK METAL MFG

AI summary

A lock capable of showing a locking state or an unlocking state comprises a latch device and an operating device for moving a latch from a latching position and an unlatching position. The operating device includes a window and an indicating member movable relative to the window. The indicating member includes a locking indication and an unlocking indication. A locking operation mechanism of the operating member may be operated to move the indicating member to a position in which the locking indication is aligned with the window and the operating device is unable to move the latch to the unlatching position or another position in which the unlocking indication is aligned with the window and the operating device is operable to move the latch to the unlatching position.