Pinch Detection Switch With Positioning Protrusion
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Solution Overview
Problem
Conventional pinch detection switches face difficulties in assembly and stability, leading to unstable positioning of components which can result in inadequate pinch detection, especially when the cord cover is larger than the tubular member and lacks sufficient friction, causing issues with detecting pinching events accurately.
Innovation Solution
A pinch detection switch design featuring a pressure sensing structure with multiple linear pressure sensing members, a coating member, and a tubular cover member with a hollow portion, where the coating member defines the position of the pressure sensing members within the cover member, ensuring stability and ease of assembly by regulating movement and maintaining contact accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cord cover is made sufficiently large compared with the tubular member, then the tubular member can be easily inserted into the hollow portion, but the position of the tubular member within the hollow portion becomes unstable
Solution Approach 1:
A positioning protrusion is provided on the inner surface of the hollow portion of the cord cover, which engages with a corresponding positioning recess on the outer surface of the tubular member. This intermediary geometric feature acts as a mediator that simultaneously facilitates easy insertion during assembly while maintaining stable positioning of the tubular member within the hollow portion, resolving the contradiction between ease of assembly and position stability.
2Ease of manufacture
If frictional force between the inner surface of the hollow portion and outer circumferential surface of the tubular member is insufficient, then the tubular member can be easily inserted, but the position of the tubular member becomes unstable
Solution Approach 1:
The positioning protrusion and recess combination serves as a mechanical intermediary that provides reliable positioning without relying on frictional forces. This geometric interlocking mechanism ensures both easy insertion during assembly and stable positioning for accurate pinch detection, resolving the contradiction between ease of assembly and detection reliability.
3Reliability
If the tubular member is inserted over substantially the entire length of the cord cover, then proper pinch detection can be achieved, but the assembly process becomes difficult
Solution Approach 1:
The positioning protrusion on the cord cover and corresponding recess on the tubular member create a mechanical guide that facilitates easy insertion of the tubular member into the hollow portion. This intermediary geometric feature enables proper positioning and full-length engagement for accurate pinch detection while significantly easing the assembly process, resolving the contradiction between detection accuracy and ease of assembly.
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 design facilitates easy assembly and accurate pinch detection by ensuring the pressure sensing members remain positioned correctly, enhancing the switch's ability to detect pinching events effectively, even when encountering objects at various angles relative to the moving direction of the slidable door.
Implementation Method 1
a pressure sensing structure (3) including at least one linear pressure sensing member (31) having a plurality of conductor wires (312) spaced apart from each other in an inner side of a tubular elastic body
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
A pinch detection switch includes a pressure sensing structure including at least one linear pressure sensing member with multiple conductor wires spaced apart from each other in an inner side of a tubular elastic body, and a tubular cover member to be attached to an end on a forward side in a moving direction of a movable body, and which is formed with a hollow portion which receives the pressure sensing structure. The pressure sensing structure includes a coating member which covers the at least one linear pressure sensing member, and which faces an inner surface of the hollow portion at both its ends in a width direction orthogonal to the moving direction of the movable body and an extending direction of the cover member. A position in the width direction of the at least one linear pressure sensing member in the hollow portion is defined by the coating member.