Card-Type Scale With Detachable Protective Cover
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Solution Overview
Problem
Current card-type scales have a limited use scope and suffer from significant precision deviations over time due to external forces during carrying, affecting weighing accuracy.
Innovation Solution
A portable card-type scale design featuring a detachable concave protective cover, movably connected upper and lower covers, and a dual-scale pan assembly, which protects the scale pan from extrusion and abrasion, allowing for expanded object weighing capabilities and maintaining precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a card-type scale is designed for portability, then ease of carrying is improved, but the scale pan assembly is pressed by uncontrollable external forces during carrying, causing precision deviation
Solution Approach 1:
The protective cover is designed as a separate detachable component that can be removed when weighing is needed and attached when carrying. This segmentation allows the scale to have protection during transport without interfering with the weighing function during use.
Solution Approach 2:
The protective cover is installed beforehand to prevent external forces from directly acting on the scale pan assembly during carrying. This prior protection prevents deformation and precision deviation before they can occur.
2Reliability
If a protective cover is added to protect the scale pan assembly, then durability and precision are improved, but device complexity increases
Solution Approach 1:
The protective cover serves multiple functions: it protects the scale pan assembly from external forces during carrying, and when removed and placed on the scale pan, it expands the weighing capability to include powder-like, fine sand-size, or granular objects. This multi-functionality justifies the added component.
Solution Approach 2:
The protective cover is designed as a simple, inexpensive component that can be easily attached and detached. Its simple structure and ease of maintenance make it a practical solution that does not significantly increase overall device complexity.
3Ease of operation
If the protective cover is made detachable, then ease of operation for weighing is improved, but manufacturing complexity increases
Solution Approach 1:
The detachable design separates the protective cover from the main scale body, allowing each component to be manufactured independently using standard manufacturing processes. This segmentation simplifies production compared to integrating protection into the main structure.
Solution Approach 2:
The detachable protective cover acts as an intermediary component that connects to the scale pan assembly through simple attachment mechanisms. This intermediary design allows for easy assembly and disassembly without requiring complex integration into the main scale structure.
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 enhances durability, portability, and precision by protecting the scale pan assembly, expanding the range of objects that can be weighed, and ensuring consistent accuracy over time.
Implementation Method 1
When an object is placed on a scale pan assembly, gravity of the object is imposed on a weight sensor
Implementation Method 2
the sensor is deformed, so that the impedance changes
Data Source
AI summary
A scale includes a display apparatus, a weighing apparatus on which a scale pan assembly and a weight sensor are disposed, and a control apparatus that connects to the weighing apparatus; further including a lower cover and an upper cover that is buckled upside-down on and movably connected to the lower cover; and the display apparatus, the weighing apparatus, and the control apparatus are all disposed in a cavity formed by the upper cover and the lower cover. A groove-shaped protective cover is detachably connected to an interior side of the upper cover.