Sliding Door Safety Device Edge Interference Detection
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Solution Overview
Problem
Existing safety devices for sliding doors fail to detect interferences with the door's motion at edges other than where the compression sensor is installed, leading to potential crushing risks.
Innovation Solution
A door assembly with a single-piece cover and compressible elements connected to pressure switches that activate upon defined compression, allowing detection of interferences at any edge, triggering a stop or inversion of the door's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compression sensor is installed at a specific edge of the door, then the safety device can detect interferences at that location, but it fails to detect interferences at other edges of the door
Solution Approach 1:
The cover is divided into multiple independent compressible elements (first compressible element at the head edge, second compressible element at the lateral edge) that can independently detect interferences at different locations. Each compressible element is associated with its own pressure switch, creating segmented detection zones across the door assembly.
Solution Approach 2:
The cover acts as an intermediary structure that transmits interference forces from any edge of the door to the corresponding compressible elements. When an object interferes with the door at any edge, the cover transfers this force to the appropriate compressible element, which then activates the corresponding pressure switch to detect the interference.
2Reliability
If multiple compression sensors are installed at different edges of the door to detect all interferences, then detection coverage is improved, but the device complexity and cost increase
Solution Approach 1:
The cover serves multiple functions simultaneously: it provides structural support, acts as a mounting structure for compressible elements and pressure switches, and functions as a force transmission mechanism that distributes interference forces to appropriate detection points. This multi-functional design eliminates the need for separate detection mechanisms at each edge.
Solution Approach 2:
The invention combines the protective cover structure with the safety detection system into a single integrated assembly. The cover is not merely a protective enclosure but an active component that incorporates compressible elements and pressure switches, merging the structural and detection functions into one unified system.
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
Effectively prevents crushing risks by detecting interferences at any edge of the door, ensuring mechanical simplicity and economical reliability.
Implementation Method 1
at least one compressible element placed on a head edge of the door and configured to connect and keep spaced apart from each other the head edge and a mating head wall of the cover
Implementation Method 2
at least one pressure switch disposed on the door's head edge and configured to be activated by a defined movement of the cover's head wall closer to the door's head edge due to a defined compression of the at least one compressible element
Data Source
Figure 1~2
Figure 3~4b
Figure 5
AI summary
Door assembly comprising a sliding door (10) and a safety device (11) for selectively closing an entry aperture (102) of an internal chamber (101) of a machine (100), and machine (100) for processing objects comprising such door assembly.