Door Seal Assembly With Pressure Sensor For Object Detection
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Solution Overview
Problem
Existing door seal systems in public transport vehicles, such as railway vehicles, fail to reliably detect thin flexible objects like ties or scarves stuck between doors, leading to passenger entrapment issues, as they require multiple sensors and are not sensitive enough to detect objects regardless of tension direction.
Innovation Solution
A set of door seals with a double baffle design and a single pressure sensor parallel to the axis of translation, which transforms transverse tension into a parallel stress, allowing detection of thin flexible objects regardless of tension direction, and includes a rib on the pressure sensor for precise pressure localization, ensuring reliable detection with minimal false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional presence detectors are used in door seals, then they can detect objects stuck between door seals, but they fail to detect thin flexible objects regardless of tension direction
Solution Approach 1:
The patent introduces a double baffle structure that transforms transverse tension forces into axial forces parallel to the sensor axis. This dimensional transformation allows a single axial sensor to detect objects regardless of the tension direction, solving the limitation of traditional sensors that only detect forces in their specific measurement direction
2Measurement precision
If multiple sensors are used to detect thin objects, then detection sensitivity improves, but device complexity and cost increase
Solution Approach 1:
The double baffle structure acts as a mechanical intermediary that transforms transverse forces into axial forces. This mediator allows a single axial sensor to indirectly detect objects subjected to transverse tension, eliminating the need for multiple sensors oriented in different directions while maintaining high detection sensitivity
3Device complexity
If a single pressure sensor is used parallel to the axis of translation, then component economy is achieved, but detection of transverse tension objects is insufficient
Solution Approach 1:
The double baffle structure transforms the detection dimension by converting transverse tension forces into axial compression forces on the sensor. This allows a single sensor oriented parallel to the translation axis to detect objects regardless of whether they are subjected to transverse or axial tension, achieving both component economy and reliable detection
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
The solution enables reliable detection of thin flexible objects stuck between door seals using a single sensor, improving sensitivity and reducing false alarms, while maintaining effective sealing against water, dust, and wind, and is economical in terms of components.
Implementation Method 1
a single pressure sensor parallel to the axis of translation, which transforms transverse tension into a parallel stress, allowing detection of thin flexible objects regardless of tension direction
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a seal assembly for a double-leaf door (3, 4) or a single-leaf door and a frame, comprising a male seal (1) and a female seal (2). This seal assembly is equipped with a device for detecting when a thin object is trapped between the male and female seals using a single pressure sensor (7). For this purpose, the male seal has a bearing surface (6) and a pressure sensor (7) projecting from the bearing surface (6), while the female seal has a cavity (18) delimited by two arms (16, 17) between which the pressure sensor is inserted when the seal assembly is in its nominal closed position. The male and female seals thus form a Q-shaped gap (28) through which the thin object passes. Thanks to this gap, any tension exerted on the thin object is transformed into compression of the pressure sensor.