Sliding Door Locking Mechanism Obstacle Removal
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Solution Overview
Problem
Conventional sliding door closing devices for cars do not provide an easy method for removing obstacles caught between the doors or between a sliding door and the frame when the doors are closed.
Innovation Solution
A door opening/closing device equipped with an electric motor, a door closing state detecting part, a locking device, a lock pin, an engaging member, a spring, and a locking control unit that allows the door to be locked and unlocked, enabling easy removal of obstacles by contracting the spring to facilitate door opening when an obstacle is present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the door is locked with a locking device after closing, then the door security is improved, but the difficulty of removing obstacles increases
Solution Approach 1:
The locking device dynamically changes its state based on detected conditions. When an obstacle is detected during door closing, the locking control unit prevents the locking device from engaging, allowing the door to remain unlockable while maintaining security under normal conditions. This dynamic adaptation resolves the contradiction between security and ease of obstacle removal.
Solution Approach 2:
The door closing state detecting part provides feedback to the locking control unit about the door's closing status. This feedback mechanism enables the system to detect when an obstacle prevents proper closing and automatically adjust the locking state accordingly, allowing easy obstacle removal while maintaining security when the door closes properly.
2Reliability
If the spring is made stronger to ensure door closing force, then the door closing reliability is improved, but the force required to remove obstacles increases
Solution Approach 1:
The spring force is dynamically managed through the locking control system. When an obstacle is detected, the locking device remains disengaged, effectively neutralizing the spring's closing force and allowing easy obstacle removal. When no obstacle is present, the spring provides full closing force for reliable door operation, resolving the force contradiction.
Solution Approach 2:
The locking control unit extracts or disables the locking function when an obstacle is detected, separating the spring's closing function from the locking function. This allows the spring to operate independently without the added resistance of an engaged locking mechanism, reducing the force needed to remove obstacles while maintaining closing reliability.
3Loss of time
If the locking device is engaged immediately after door closing, then the security response time is improved, but the ability to handle obstacles is worsened
Solution Approach 1:
The door closing state detecting part performs preliminary detection of the door's closing status before the locking device is engaged. This preliminary action allows the locking control unit to assess whether an obstacle is present and make an informed decision about locking, ensuring both rapid security response and proper obstacle handling.
Solution Approach 2:
The detecting part provides real-time feedback during the door closing process, enabling the locking control unit to make immediate decisions about locking engagement. This feedback loop ensures that security is maintained with minimal delay while simultaneously detecting obstacles that would prevent proper closing, resolving the time versus obstacle handling contradiction.
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
Enables users to easily pull out obstacles caught between the doors, reducing the frequency of unlocking and re-opening the doors, thus allowing for early start times and minimizing schedule delays during rush hours.
Implementation Method 1
a spring provided between the opening/closing bar and the engaging member
Data Source
AI summary
A door opening/closing device includes: an opening/closing bar attached to a door, which is actuated by a motor and is used for opening and closing the door; a door closing state detecting part configured to detect whether the door is in a closed state; a locking device configured to lock and unlock the door; a lock pin capable of being moved to a locked position or an unlocked position by the locking device; an engaging member attached to the opening/closing bar, which includes an engaging part configured to engage with the lock pin moved to the locked position; a first spring provided between the opening/closing bar and the engaging member; and a locking control unit configured to cause the locking device to lock the door when the closed state is detected by the door closing state detecting part.