Interference-Fit Hand Warmer Assembly Without Magnetic Fasteners
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Solution Overview
Problem
Existing hand warmers have high assembly costs due to magnetic suction and are prone to adsorbing iron filings, making them difficult to clean and maintain.
Innovation Solution
A simple assembled hand warmer design featuring interference-fit splicing convex blocks and grooves on two hand warmer bodies, allowing for easy alignment and separation, preventing iron filing adsorption and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If magnetic suction assembly is used to assemble hand warmer components, then the hand warmer can be assembled and disassembled, but the assembly cost is high and iron filings are easily adsorbed
Solution Approach 1:
The patent replaces the magnetic suction assembly system with a mechanical splicing system using convex blocks and grooves. This substitution eliminates the harmful effect of iron filings adsorption while reducing assembly cost by using simpler mechanical components instead of magnetic assemblies.
Solution Approach 2:
The hand warmer is divided into multiple separable components (first hand warmer body and second hand warmer body) that can be assembled through splicing convex blocks and grooves. This segmentation allows for easy assembly and disassembly without requiring magnetic suction, thereby reducing cost and avoiding iron filings adsorption.
2Reliability
If magnetic suction assembly is used, then components can be held together, but cleaning and maintenance become difficult
Solution Approach 1:
The mechanical splicing system with convex blocks and grooves replaces magnetic suction, providing reliable component retention through precise mechanical interlocking while enabling easy cleaning and maintenance by allowing straightforward disassembly of components.
3Ease of manufacture
If splicing convex blocks and grooves are used, then assembly cost is reduced and iron filings are not adsorbed, but alignment precision must be maintained
Solution Approach 1:
The splicing mechanism uses asymmetric convex blocks and corresponding grooves that provide self-aligning features. The asymmetric geometry ensures precise alignment during assembly while keeping the manufacturing cost low and avoiding iron filings adsorption, as the shape guide the components into correct positioning automatically.
Data Source
AI summary
The present disclosure relates to a simple assembled hand warmer, which includes two body parts that can be spliced and separated, i.e., a first hand warmer body and a second hand warmer body; the first hand warmer body is provided with a first splicing surface, the second hand warmer body is provided with a second splicing surface; a splicing mechanism is provided between the first splicing surface and the second splicing surface, the splicing mechanism includes at least one splicing convex block provided on the first splicing surface and at least one splicing groove provided on the second splicing surface. The splicing convex block is interference-fit with the splicing groove; and during splicing, the splicing convex block of the first hand warmer body is embedded into the splicing groove of the second hand warmer body.