Cleaver Crush-Forged Crank Bolster Design
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Solution Overview
Problem
Cleavers with upset forged bolsters often cause uncomfortable pressure points due to direct contact between fingers and the tang-side surface of the blade, leading to potential injuries and suboptimal handling.
Innovation Solution
The bolster is designed to partially cover the rear edge of the blade, with a configuration that allows the cutting edge to be used fully, and features such as a wider surface for finger comfort, arcuate shapes, and recesses to guide fingers, ensuring protection and controlled handling. The cleaver can be made from a single stainless material using upset forging, with optional gripping elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the bolster fully covers the rear edge of the blade for finger protection, then finger safety is improved, but the usable length of the cutting edge is reduced
Solution Approach 1:
The bolster is designed with selective coverage, protecting only specific areas where finger contact is most likely while leaving the lower rear edge uncovered to maintain full cutting edge usability. This localized protection approach balances safety with functional performance.
Solution Approach 2:
Instead of full coverage of the rear edge, the bolster provides partial coverage only where needed for finger protection. This partial action approach prevents the trade-off between protection and cutting edge length by applying protection only in critical zones.
2Ease of operation
If the tang-side surface of the blade is exposed for full cutting edge access, then cutting performance is improved, but finger comfort and safety deteriorate
Solution Approach 1:
The bolster acts as an intermediary element between the blade and the user's fingers. It provides a protective surface that prevents direct contact with the tang-side blade surface while maintaining full access to the cutting edge, thus mediating between safety and operational requirements.
3Ease of operation
If the bolster is made wider to provide finger resting surface, then handling comfort is improved, but the overall device complexity increases
Solution Approach 1:
The bolster width is increased only in the specific region where finger contact occurs, rather than uniformly across the entire bolster. This localized dimensional change provides ergonomic benefits while minimizing the increase in overall device complexity.
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
This design prevents finger contact with the blade, enhances handling comfort, and allows for optimal use of the cutting edge while protecting fingers, with improved stability and reduced production costs.
Implementation Method 1
The present invention relates to a cleaver with an upset forged bolster. Knives are also known in which the blade, the bolster and the tang are made from a single blank by upset forging.
Data Source
Figure 1~3
Figure 4~5
Figure 6~7
AI summary
The present invention relates to a cleaver (8) having a crush-forged crank (6). In order to provide a cleaver having an improved manageability and surface feel, thereby preventing any possible injuries during the use of the cleaver, the invention proposes that the crank according to the invention extends from the handle (4) in the direction of the cutting edge (11) along the blade and/or edge surface (5) on the handle side.