Panic Exit Door Lock Visual State Indicator
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Solution Overview
Problem
Panic exit door locks lack a visual indication of their locking state from the inner side, making it difficult for users to confirm whether the lock is in a locking or unlocking position.
Innovation Solution
A panic exit door lock design that includes a locking state indicator, where a pivotal indicator member with a window on the inner cylinder seat aligns either a first portion (indicating unlocking) or a second portion (indicating locking) with a window, providing a visual confirmation of the lock's state to the user on the inner side of the door.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a panic exit door lock is designed with a press bar for easy unlatching, then ease of operation is improved, but the ability to confirm locking state visually is lost
Solution Approach 1:
An indicator member is introduced as an intermediary element between the locking mechanism and the user. This indicator member includes an arm that rotates to point at different positions on a dial, serving as a mediator that translates the internal locking state into visible information for the user without interfering with the press bar operation.
Solution Approach 2:
The patent replaces the need for tactile confirmation (pressing the press bar to feel if locked) with a visual indication system. The indicator member with its arm pointing at positions on a dial substitutes the mechanical tactile feedback with optical visual feedback, allowing users to confirm locking state by looking rather than feeling.
2Ease of operation
If the locking mechanism is simplified for easy operation, then ease of operation is improved, but device complexity is reduced
Solution Approach 1:
The locking mechanism is segmented into distinct functional modules: a press bar for triggering unlatching, a latch for holding the locked state, a locking member for preventing handle rotation, and an indicator member for displaying the state. This segmentation allows each component to perform its specific function efficiently while keeping the overall design manageable and not excessively complex.
Solution Approach 2:
The indicator member serves multiple functions: it indicates the locking state, it is driven by the same mechanism that operates the latch, and it provides feedback without requiring separate actuators or complex control systems. This multi-functionality reduces overall device complexity while maintaining ease of operation.
Data Source
AI summary
A panic exit door lock includes an outer operational device mounted to an outer side of a door, an inner operational device mounted to an inner door of the door, a lock mounted in the door, and a locking mechanism mounted between the inner and outer operational devices and the lock. The locking mechanism includes an outer cylinder mounted to the outer operational device and an inner cylinder mounted to the inner operational device. An indicator member is operably connected to the inner cylinder and a setting member. The setting member is connected to a transmission block. When a key is used to set a locking function of the inner or outer cylinder, the transmission block and the indicator member pivot jointly. A user can see whether the locking function is set by observing the position of the indicator member via a window of an inner cylinder seat.