Scissors Finger Pinch Prevention Guards Cantilever Design
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Solution Overview
Problem
Conventional scissors with protrusions to prevent finger pinch still risk pinching fingertips between the protrusion and the opposing inner surface, especially when cutting forceful materials like metal plates, as the protrusion does not fully prevent fingertips from reaching the inner surfaces during closure.
Innovation Solution
The scissors feature finger pinch prevention guards extending cantilever-style from the operation portions to prevent fingertips from entering the opposing inner surfaces, combined with protruding portions that create a center gap and anti-slipping recesses and projections to maintain finger placement and prevent pinching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protrusion is provided on the inner surface of the operation portion to prevent finger pinch, then the closing operation limit is restricted and fingertips are prevented from reaching the opposing inner surfaces, but the protrusion itself creates a new pinching point between the protrusion and the opposing inner surface
Solution Approach 1:
The operation portion is segmented into multiple functional zones: the protrusion (first protruding portion) creates a first gap to prevent fingertips from reaching the opposing inner surface, while the second protruding portion creates a second gap to prevent pinching at the protrusion itself. This segmentation of protective features eliminates the harmful effect of the single protrusion design.
Solution Approach 2:
The finger placement groove acts as an intermediary structure that guides and constrains fingertip placement. By providing a dedicated groove that accommodates the fingertip, the design prevents direct contact between the fingertip and both the protrusion and the opposing inner surface, thereby eliminating the pinching hazard while maintaining the closing operation limit restriction.
2Force
If great closing operation force is applied to cut metal plates or other tough materials, then cutting capability is improved, but the risk of finger pinch increases as fingertips may be forced deeper into the operation portions
Solution Approach 1:
The finger placement groove and multiple protruding portions are pre-configured to guide fingertip placement before the cutting operation begins. This preliminary structural arrangement ensures that even when great closing force is applied, the fingertip remains constrained within the safe zone defined by the grooves and protrusions, preventing forced deeper insertion that would cause pinching.
Solution Approach 2:
Different regions of the operation portion are given different local qualities: the finger placement groove provides a soft, accommodating region for fingertip placement, while the protruding portions provide hard, restrictive boundaries. This local differentiation allows the operation portion to simultaneously accommodate high closing forces while protecting the fingertip from pinching hazards.
Data Source
AI summary
Provided are scissors with excellent safety that can more reliably prevent finger pinch when being closed. In the present invention, finger pinch prevention guards 20a, 20b for preventing fingertips from entering the opposing inner surfaces 10a, 10b side from above or below are formed on left and right operation portions 7a, 7b. This can prevent user's fingertips from reaching the opposing inner surfaces (10a, 10b) by setting the user's fingertips inserted into finger placing holes (6a, 6b) along upper and lower surfaces of the finger pinch prevention guards 20a, 20b. Consequently, when the operation portions 7a, 7b are in the closed position, the fingertips are prevented from being pinched between the opposing inner surfaces 10a, 10b so as not to cause finger pinch.