Measuring Device Connecting Element Torsional Rigidity
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Solution Overview
Problem
Conventional measuring devices with two cover parts are prone to torsional rigidity issues, leading to potential damage upon impact, and lack a secure attachment mechanism to prevent accidental dropping.
Innovation Solution
A measuring device with a connecting element positioned externally to interconnect the cover parts, featuring a bridging portion and attachment points for securing a string or cord, enhancing torsional rigidity and providing a means to attach the device to a user's garment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cover is made of two cover parts connected by internal screws, then the device is easy to assemble and manufacture, but the torsional rigidity is insufficient and the device is fragile upon impact
Solution Approach 1:
The connecting element moves the connection from an internal, one-dimensional arrangement to an external, three-dimensional structure that spans across the interface between cover parts. This external positioning in a different spatial dimension provides superior torsional rigidity while maintaining assembly simplicity through standardized connection interfaces.
Solution Approach 2:
The connecting element is formed as a composite structure integrating multiple functions: the bridging portion for structural reinforcement, the attachment portions for securing cover parts, and the passage for cord attachment. This composite design consolidates multiple components into one element, improving both strength and ease of manufacture.
2Ease of manufacture
If the cover is made of two cover parts connected by internal screws, then the manufacturing method is simple, but the device lacks secure attachment mechanism and is prone to accidental dropping
Solution Approach 1:
The connecting element serves multiple functions simultaneously: it acts as a structural connector for the cover parts, provides reinforcement against torsional forces, and offers attachment points for cords or strings to prevent accidental dropping. This multi-functionality is achieved within a single component that maintains manufacturing simplicity.
Solution Approach 2:
The connecting element is segmented into distinct functional portions: the bridging portion for structural connection, and separate attachment portions that can accommodate cords or strings. This segmentation allows each portion to be optimized for its specific function while maintaining overall manufacturing simplicity through standardized formation processes.
3Strength
If an external connecting element is added, then the torsional rigidity is improved, but the device complexity increases
Solution Approach 1:
Multiple functions that would traditionally require separate components are merged into the single connecting element: the bridging portion for structural connection, the attachment portions for securing cover parts, and the integrated passage for cord attachment. This merging reduces the total number of components and simplifies the overall device structure while maintaining enhanced torsional rigidity.
4Adaptability or versatility
If a passage is formed under the bridging portion, then a cord can be attached for securing the device, but the manufacturing process becomes more complex
Solution Approach 1:
The passage is formed as an integral feature of the connecting element during its primary manufacturing process, rather than being added as a separate post-processing step. This preliminary formation of the passage ensures that the attachment capability is built-in from the start, and the manufacturing process remains straightforward by combining multiple features into a single formation operation.
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
A measuring device (100, 400) comprising: a cover (104, 404) comprising a first (106, 406) and a second (108, 408) cover part which are interconnected to each other, thereby forming an interface (110) between the first (106, 406) and second (108, 408) cover parts, wherein the first cover part (106, 406) comprises a first fixing means (112, 206, 508) and the second cover part (108, 408) comprises a second fixing means (112', 206', 510), a coiled measuring tape arranged within the cover (104, 404) and being extendable/retractable via an opening (412) in the cover (104, 404), and a connecting element (102, 202, 302, 502) positioned at a periphery of the cover (104, 404) and connected to the first (112, 206, 508) and second (112', 206', 510) fixing means, the connecting element (102, 202, 302, 508) forming a bridging portion (132, 308) extending across the interface (110) in a direction from the first cover part (106) to the second cover part (108), wherein a passage (126) is formed under a lower surface(134) of the bridging portion (132, 308), which lower surface (134) is directed towards the cover (104, 404).