Cylindrical Door Lock Axial Indicator Mechanism
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Solution Overview
Problem
Existing door locks do not effectively indicate their locked or unlocked status to nearby persons, which can lead to confusion and security concerns.
Innovation Solution
A cylindrical door lock design that includes an exterior handle with an indicator to display the lock status, featuring a locking bar and a locking piece that moves axially and radially to engage with a system of bars and indicators, allowing the status to be visually communicated through openings or windows on the handle, ensuring clear indication of the lock's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If an indicator mechanism is added to the door lock, then the visibility of lock status is improved, but the device complexity increases
Solution Approach 1:
The indicator mechanism utilizes the existing axial motion of the locking bar to automatically drive the indicator display without requiring separate power sources or control systems. The locking bar's movement directly actuates the indicator through the bar mechanism, making the system self-servicing and avoiding additional complexity
Solution Approach 2:
A series of bars (first bar, second bar) are introduced as intermediary elements to transmit the axial motion from the locking bar to the indicator. These intermediaries convert the locking bar's axial movement into indicator movement while maintaining a simple mechanical connection that does not significantly increase system complexity
2Loss of information
If a locking piece with radial and axial motion is used, then the lock status indication is improved, but the device complexity increases
Solution Approach 1:
The locking piece serves multiple functions: it engages with the locking bar to control lock status, and simultaneously its axial and radial motion drives the indicator mechanism. This multi-functionality eliminates the need for separate indication mechanisms, thereby improving lock status indication without proportionally increasing complexity
Solution Approach 2:
The locking piece's motion mechanism is merged with the indicator drive mechanism. The same axial and radial movements that control the locking function also drive the indicator bars, combining two functions into one integrated component that reduces overall system complexity
3Reliability
If multiple bars are used to transmit motion, then the indicator reliability is improved, but the device complexity increases
Solution Approach 1:
The motion transmission is divided into multiple independent bar segments (first bar, second bar) that can move independently. This segmentation allows each bar to be optimized for its specific function and provides redundancy, improving reliability while keeping each individual bar simple and the overall complexity manageable
Data Source
AI summary
Disclosed herein are cylindrical door locks configured to indicate the lock status of the door lock to nearby persons. In some instances, the lock status is indicated on a first side of the door. In other instances, the lock status is indicated on both a first side and a second side of the door.