Sequential Dead Bolt Unlocking Mechanism for Mortise Lock Safety
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Solution Overview
Problem
Conventional door mortise locks face safety and reliability issues due to simultaneous operation of dead bolts and latch bolts, leading to accidental unlocking and potential damage when the dead bolt is not unlocked.
Innovation Solution
A door mortise lock design that includes a dead bolt driving unit, a latch bolt driving unit, and a connection unit, allowing the dead bolt to be completely unlocked first, followed by the latch bolt after a time interval, ensuring sequential operation and enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a dead bolt and a latch bolt simultaneously operate to unlock the latch bolt, then the door lock can be unlocked quickly, but the product safety and reliability decrease because the door lock is easily unlocked and users feel uncomfortable
Solution Approach 1:
The unlocking operation is segmented into two sequential phases: first the dead bolt is unlocked, then after a time interval, the latch bolt is unlocked. This segmentation prevents simultaneous operation and ensures the dead bolt is fully retracted before the latch bolt moves, eliminating the safety issue while maintaining efficient unlocking
Solution Approach 2:
The dead bolt is unlocked as a preliminary action before the latch bolt is unlocked. The connection unit ensures that the dead bolt driving unit completes its operation first, and only after a predetermined time interval does the latch bolt driving unit activate. This preliminary action sequence ensures safety while maintaining overall unlocking efficiency
2Ease of operation
If the latch bolt is unlocked when the dead bolt is not unlocked, then the lever operation becomes responsive, but safety-related accidents and damage to the lever may occur
Solution Approach 1:
The dead bolt unlocking is performed as a preliminary action before the latch bolt can be unlocked. The connection unit includes a time interval mechanism that ensures the dead bolt driving unit has completed its operation before activating the latch bolt driving unit, preventing the harmful scenario where the latch bolt moves while the dead bolt is still engaged
Solution Approach 2:
The connection unit acts as an intermediary between the dead bolt driving unit and the latch bolt driving unit. It mediates the unlocking sequence by detecting when the dead bolt is fully retracted and only then permitting the latch bolt to move, thereby preventing safety accidents while maintaining operational responsiveness
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
This design prevents accidents and maximizes product safety and reliability by ensuring the dead bolt operates fully before the latch bolt, stabilizing the unlocking process and preventing malfunctions.
Implementation Method 1
a dead bolt motor when unlocking information is input from a lever located in an exterior
Implementation Method 2
a gear unit that is connected to the connection unit such that the driving cam rotates due to the connection unit during the push operation and/or the pull operation of the lever located in the interior
Data Source
AI summary
Provided is a door mortise lock that may improve product safety and user convenience by enabling a latch bolt operates to be unlocked after a dead bolt of the door mortise lock completely operates. To this end, the door mortise lock includes: a dead bolt driving unit that operates a dead bolt; a latch bolt driving unit that unlocks a latch bolt when a time interval passes after the dead bolt is unlocked by the dead bolt driving unit; and a connection unit that is disposed between the dead bolt driving unit and the latch bolt driving unit, and selectively operates the dead bolt driving unit and the latch bolt driving unit so that the dead bolt and the latch bolt are sequentially unlocked with a time interval.