Serrated Blender Blade Design to Reduce Breakage on Hard Ingredients
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Solution Overview
Problem
Rotating blades in blenders often break due to sharpness leading to a trade-off between operational reliability and cutting performance, as sharp edges are prone to breaking when cutting hard ingredients.
Innovation Solution
A blade design featuring a rotation axis with knives extending radially, each having serrations and flat portions where the serrations are sharper and the flat portions are duller, providing a high cutting performance while preventing breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blade is ground to be sharp to improve cutting performance, then the cutting performance increases, but the blade becomes prone to breaking when impacting hard ingredients
Solution Approach 1:
The blade features a dual-edge design where only specific portions (serrations) are sharpened while other portions (flat portions) remain dull. This local differentiation allows the sharp serrations to perform cutting functions on softer ingredients while the dull flat portions provide impact resistance when encountering hard ingredients, thereby resolving the contradiction between cutting performance and operational reliability
Solution Approach 2:
The blade's cutting edge is segmented into distinct functional zones: sharp serrations for cutting and dull flat portions for impact absorption. This segmentation allows different parts of the blade to serve different purposes, enabling the blade to maintain both high cutting performance and operational reliability by distributing functions across multiple segments
Data Source
AI summary
A blade means for a mixer, such as for example an immersion blender or stand mixer includes a rotational shaft; at least one blade which extends from the rotational shaft and has at least one cutting edge; and a plurality of serrations which are formed in the at least one cutting edge. The individual serrations are spaced apart from one another by a planar portion of the at least one cutting edge, wherein the planar portion of the at least one cutting edge is less sharp than the serrations.