Door Lock Indicator With Direct Mechanical Status Feedback
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Solution Overview
Problem
Existing door locks, particularly those that are always unlocked from the interior side, make it difficult for individuals to quickly ascertain their lock status, which can be crucial in emergency situations.
Innovation Solution
A door lock mechanism that includes an indicator member pivoted to transition between visible and hidden positions based on the lock's state, using an actuator directly connected to the locking mechanism to indicate locked or unlocked status without electronic power, visible from the interior side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the door lock is designed to be always unlocked from the interior side for ease of operation, then the ease of operation is improved, but the ability to quickly ascertain lock status deteriorates
Solution Approach 1:
An indicator member is introduced as an intermediary component between the locking mechanism and the user. This indicator pivots to different positions based on the lock status, providing visual information about whether the lock is locked or unlocked without changing the operational characteristics of the lock itself.
Solution Approach 2:
The indicator member provides immediate visual feedback to the user about the current lock status. When the locking mechanism changes state, the indicator pivots accordingly, giving the user instant information about whether the door is locked or unlocked, thereby eliminating the information loss problem.
2Loss of information
If an indicator mechanism is added to show lock status, then the lock status indication is improved, but the device complexity increases
Solution Approach 1:
The indicator member is merged with the existing locking mechanism components. The indicator is pivoted by the same actuator that operates the locking mechanism, and both share common mounting structures and drive trains, thereby minimizing the increase in device complexity while achieving status indication functionality.
Solution Approach 2:
The indicator member serves multiple functions: it indicates lock status, provides visual feedback, and can be integrated with the existing handle assembly. This multi-functionality reduces the need for separate independent components, thereby limiting the increase in device complexity.
3Ease of operation
If the indicator is visible from the interior side, then the ease of operation is improved, but the security against interior tampering deteriorates
Solution Approach 1:
The indicator mechanism is segmented into separate functional zones: the indicator member itself is visible from the interior, but the critical locking components remain protected within the lock body. This segmentation allows the indicator to provide information while the actual locking mechanism maintains its security against interior tampering.
Solution Approach 2:
The indicator member acts as an intermediary that exposes lock status information without exposing the locking mechanism. It provides the necessary information while maintaining a physical barrier between the user and the critical locking components, thereby preserving security against interior tampering.
Data Source
AI summary
Disclosed herein is a door lock configured to indicate the lock status of the door lock to nearby persons. In some instances, the door lock includes a locking mechanism with one or more actuators configured to act directly on an indicator such that the indicator indicates the lock status of the lock.