Pivoting Cutting Blade Mount for Fast Replacement
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Solution Overview
Problem
Existing cutting devices require cumbersome processes to replace worn-out cutting blades, involving the loosening of nuts and reattachment of new blades, which is inefficient and time-consuming.
Innovation Solution
A cutting device design featuring pivotable cutting blades connected via shaft members and movement restriction members, allowing for easy detachment and replacement by removing a cover and repositioning stoppers, simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cutting blade is attached to the body with a bolt and a nut, then the cutting blade can be securely fixed, but the process of replacing the cutting blade becomes cumbersome and time-consuming
Solution Approach 1:
The connection structure is segmented into modular components: the cutting blade with opening, the link with opening, and the shaft member that connects them. This segmentation allows the cutting blade to be quickly attached and detached by simply inserting or removing the shaft member through the openings, eliminating the time-consuming bolt and nut assembly while maintaining secure fixation during operation
Solution Approach 2:
The fastening function is extracted from the traditional bolt-nut system and integrated directly into the shaft member insertion mechanism. The shaft member itself serves as both the connection element and the fastening element, taking out the separate fastening components (bolts and nuts) and simplifying the overall structure for quicker blade replacement
2Strength
If a cutting blade is attached to the body with a bolt and a nut, then the connection is strong and reliable, but the operation complexity increases due to multiple fastening steps
Solution Approach 1:
The connection is segmented into discrete components (cutting blade, link, shaft member) that align through openings. This segmentation enables a simple insert-remove operation while maintaining strong connection during cutting, as the shaft member passes through precisely positioned openings in both the cutting blade and link, creating a robust pivotable joint
Solution Approach 2:
Instead of using a threaded fastening system where the fastener engages with threaded holes, the invention inverts the approach by using a smooth shaft member that passes through open holes. The connection strength is achieved not through threading but through the precise fit and pivotable joint design, making the operation simpler while maintaining reliability
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A cutting device (10) includes: a first cutting blade (111) in which a first opening (H1) and a second opening (H2) are formed; a first link (121) in which an opening is formed; a frame in which an opening is formed; at least one of a first shaft member (first pin P1) pivotably connecting the first cutting blade (111) to the first link (121) by being inserted through the first opening (H1) and the opening (LH1) of the first link (121), and a second shaft member (second pin P2) pivotably connecting the first cutting blade (111) to the frame (11) by being inserted through the second opening (H2) and the opening of the frame (11); and at least one of a first movement restriction member (first stopper ST1) configured to restrict the first shaft member (first pin P1) from moving in a direction of detaching from the first opening (H1), and a second movement restriction member (third stopper ST3) configured to restrict the second shaft member (pin P2) from moving in a direction of detaching from the second opening (H2).