Door Lock Device Latch Position Detection Mechanism
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Solution Overview
Problem
Existing door lock devices face challenges in accurately detecting door-open and fully-closed states due to limited space around the hook, making precise sensor installation and adjustment difficult, and there is a need for a more integrated and easy-to-set-up configuration.
Innovation Solution
The door lock device detects the door-open state by monitoring the operation of the latch instead of the hook, using a latch controller and detector to ensure precise detection without requiring space around the hook, and includes a motor-operated driving mechanism and levers to manage the latch's position and rotation, allowing for accurate state detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a detector is installed on a different part from the base plate due to limited space around the hook, then the door lock device can be assembled, but sensor accuracy adjustment becomes troublesome and detection precision is compromised
Solution Approach 1:
The detector is integrated directly onto the base plate, merging the detection function with the mounting structure. This eliminates the need for separate installation on different parts and removes the troublesome sensor accuracy adjustment process while maintaining detection precision.
Solution Approach 2:
The patent introduces a detector that monitors the latch position as an intermediary indicator. Since the latch position directly reflects the door lock state, detecting latch position becomes a reliable proxy for detecting door state, achieving high precision without complex sensor installation around the hook.
2Area of stationary object
If the detector is installed away from the hook, then installation space constraint is satisfied, but setup complexity increases due to troublesome sensor accuracy adjustment
Solution Approach 1:
The detector is merged with the base plate structure, creating an integrated assembly that reduces setup complexity. The detector becomes part of the standard installation package, eliminating the need for separate calibration procedures.
Solution Approach 2:
The system uses the latch's own position as the detection target, making the latch itself serve as the reference for detection. This self-referential approach eliminates the need for external calibration against the hook position, simplifying the setup process.
3Measurement precision
If the detector monitors the hook position, then direct door lock state detection is achieved, but space constraints around the hook prevent proper detector installation
Solution Approach 1:
The latch position is used as an intermediary indicator to infer the door lock state. Since the latch engagement with the hook directly determines whether the door is locked or unlocked, monitoring the latch position provides accurate door state detection without requiring space around the hook.
Solution Approach 2:
Instead of detecting the hook position directly, the patent inverts the detection approach by monitoring the latch position. This reverse detection strategy achieves the same information about door state while avoiding the space constraint problem around the hook.
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 solution enables high-precision door-open state detection without space constraints, facilitating easier installation and improving productivity by integrating the detector within the door lock device, ensuring accurate state detection and preventing false openings.
Implementation Method 1
prevents the hook from rotating toward the striker releasing position by engagement between the engaging portion of the hook and the latch
Implementation Method 2
makes the latch return to the latching position upon the hook reaching the striker releasing position after engagement between the latch and the hook has been released by causing the latch to rotate toward the unlatching position from the latching position
Implementation Method 3
a detector which, during the door opening operation, detects that the door is open by referring to the returning operation of the latch to the latching position from the unlatching position that was performed by the latch controller
Data Source
AI summary
A door lock device includes a hook rotatable supported on a base plate; a latch supported on the base plate and rotatable between a latching position, engageable with the hook and an unlatching position not engaged with the hook; a latch controller which prevents the hook from rotating from the striker holding position to the striker releasing position, and makes the latch return to the latching position upon the hook reaching the striker releasing position after engagement between the latch and the hook is released by rotating the latch to the unlatching position from the latching position when the latch controller performs a door opening operation from the door fully-closed state; and a detector which detects that the door is open by referring to the returning operation of the latch to the latching position from the unlatching position that is caused by the latch controller.