Folding Knife Protrusion Nesting in Blade Recess
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Solution Overview
Problem
Conventional folding knives with protrusions on the blade side that automatically open when removed from a holster or pocket often cause discomfort as the protrusion hits the user's thumb when trying to push the blade down, limiting the force applied due to its location on the back side of the blade.
Innovation Solution
A folding knife design featuring a movable piece and a rotation mechanism that allows the protrusion to be accommodated within a notch on the blade when open, preventing it from hitting the user's thumb, and ensuring it catches on the holster or pocket to open the blade, utilizing a stopper mechanism to control the protrusion's position relative to the blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a protrusion is formed on the blade side to enable automatic opening from holster, then the blade can be automatically opened when taken out of holster, but the protrusion hits the user's thumb when pushing the blade down in open state
Solution Approach 1:
The protrusion is nested within a recess formed on the blade back side when the blade is in open state. This nesting arrangement allows the protrusion to be positioned such that it does not protrude outward to hit the user's thumb, while still maintaining its function to catch on the holster for automatic opening. The recess effectively hides the protrusion in the harmful position while preserving its useful function.
2Extent of automation
If the protrusion is positioned on the back side of the blade for automatic opening, then the automatic opening function is achieved, but the user cannot push down the back side of the blade with sufficient force
Solution Approach 1:
By nesting the protrusion within a recess on the blade back side, the design eliminates the obstruction that previously prevented sufficient force application. The recess creates a smooth surface that allows the user's thumb to rest comfortably and apply maximum pushing force without encountering the protrusion, while the protrusion remains positioned to engage with the holster for automatic opening.
Data Source
AI summary
A folding knife includes a movable piece that is attached to a blade and a handle so as to be relatively rotatable by a specific rotation angle with respect to the blade, and to rotate with respect to the handle together with the blade outside the specific rotation angle; a notch or a recess formed at a position near a rotating shaft portion on the back side of the blade; a protrusion that is formed at a position on the movable piece and in a shape corresponding to the notch or recess of the blade; and a rotation mechanism including the rotating shaft portion that allows the movable piece to rotate with respect to the blade only within a specific rotation angle.