Door Opening Detection Device Using Gravity-Actuated Tag
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Solution Overview
Problem
Existing door opening detection systems face challenges in precisely and quickly detecting the open state of a door, regardless of the door type or opening method, and are limited by the need for separate installations and sensitivity to opening speed and user characteristics.
Innovation Solution
A door opening detection device mounted to a door handle, featuring a tag and door sensing unit connected by a string, where the tag moves outward when the door opens, causing the sensing unit to fall and detect the opening, independent of opening speed or method, and transmit a signal for door state recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an acceleration sensor or gyro sensor is used to detect door opening by measuring acceleration or gyration changes, then door opening can be detected, but the detection precision and speed vary according to door shape, type, and opening method, making it difficult to quickly and precisely estimate door operation
Solution Approach 1:
The detection device is divided into two separate components: a mark unit that moves with the door and a sensing unit that remains stationary. This segmentation allows each component to have a specific, optimized function - the mark unit simply follows door movement while the sensing unit provides consistent detection reference, eliminating the need for complex integrated designs that must adapt to various door types.
Solution Approach 2:
A string acts as an intermediary element connecting the mark unit on the door to the sensing unit. This simple mechanical linkage translates door movement into detectable signal changes without requiring complex mechanical or electronic adaptation mechanisms, providing universal applicability across different door types and opening methods.
2Reliability
If a sensor is attached to the door or installed on a door lock to detect opening and closing, then door state can be detected, but installation becomes inconvenient and usage flexibility is limited due to per-door or region-based requirements
Solution Approach 1:
The detection device is designed to be universally applicable to any door type and location. The mark unit can be attached to any door handle or component, and the system works regardless of door shape, size, or opening mechanism. This universal design eliminates the need for per-door installation configurations and provides immediate functionality anywhere a door exists.
Solution Approach 2:
The device uses the door's own movement and the gravitational force acting on the mark unit-string-sensing unit assembly to generate the detection signal. The system is self-actuating through the natural physics of the setup, requiring no external power source, motor, or complex mechanical linkage beyond the simple string connection, thereby simplifying installation and maintenance.
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 fast and precise detection of door openings, adaptable to various door types and methods, with flexible installation and reduced sensing failures, allowing immediate notification to robots or systems of door status.
Implementation Method 1
the door sensing unit moves in the direction of gravity, thereby detecting the movement
Data Source
AI summary
A door opening detection device and a door opening recognition system are disclosed. The door opening recognition system comprises the door opening detection device and a robot. The door opening detection device is mounted to an inside door handle, and the robot comprises a communication module and performs a predetermined operation in an internal space located inside a door in a state where the door is closed. The door opening detection device is operated in a state where, when the door is closed, a door sensing unit connected to one end of a string is located inside the door and a tag connected to the other end of the string and connected to the door sensing unit is fixed to be located outside the door. As the other end of the string and the tag are pulled in the opposite direction to the direction of gravity through a door gap when the door is opened, the door opening detection device detects that the door sensing unit has been moved in the direction of gravity, and generates a detection signal corresponding thereto. Then, the robot receives the detection signal from the door opening detection device through the communication module, and recognizes the opening of the door and stops the operation on the basis of the received detection signal.