Scissors With Orthogonal Finger Holes for Straight-Wrist Use
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Solution Overview
Problem
Conventional scissors cause pain in fingers and wrist due to the diagonal insertion of the thumb, leading to discomfort and potential thumb disengagement during prolonged use.
Innovation Solution
The design includes a first handle portion with orthogonal finger insertion holes for fingers other than the thumb and a second handle portion with an oblong thumb insertion hole, allowing for a comfortable, straight wrist posture and adjustable thumb angle to minimize thumb and wrist strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the thumb is inserted through the insertion hole in a diagonal direction in conventional scissors, then the scissors can be manufactured with a simple structure, but pain is caused in the thumb and wrist during scissoring
Solution Approach 1:
The insertion hole is divided into two separate holes: a first insertion hole for fingers and a second insertion hole for the thumb. This segmentation allows each hole to be optimized for its specific finger, enabling straight insertion for the thumb to prevent wrist twisting while maintaining manufacturing simplicity.
Solution Approach 2:
The first and second insertion holes are positioned asymmetrically relative to each other and to the blade axis. The second insertion hole for the thumb is positioned to allow straight insertion, while the first insertion hole for fingers is positioned accordingly, creating an asymmetric grip structure that eliminates diagonal thumb insertion and wrist strain.
2Device complexity
If the thumb is inserted diagonally in conventional scissors, then the structure is simple, but the wrist is twisted causing wrist pain during prolonged use
Solution Approach 1:
By separating the single insertion hole into two distinct holes for different fingers, the design allows the thumb to insert straight while other fingers insert from the opposite side, eliminating wrist twisting without significantly increasing overall structural complexity.
Solution Approach 2:
The solution moves from a single-point insertion (diagonal) to a distributed multi-point insertion system where the thumb and other fingers insert from different directions and positions, changing the dimensional arrangement of finger placements to eliminate wrist strain.
3Volume of moving object
If the insertion hole length for thumb insertion is short in conventional scissors, then the structure is compact, but the thumb falls out of the insertion hole during scissoring
Solution Approach 1:
The retention function is segmented between two separate insertion holes with different characteristics. The second insertion hole for the thumb is designed with specific dimensional features that prevent thumb disengagement, while the overall handle remains compact through optimized positioning of both holes.
Solution Approach 2:
The parameters of the second insertion hole (position, orientation, dimensions) are specifically changed to allow straight thumb insertion and provide adequate retention length, while the first insertion hole parameters are optimized for finger insertion, achieving both compactness and reliable thumb retention.
Data Source
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AI summary
The present invention relates to scissors to be comfortably used by hand, the scissors including a first rotating body in which a first handle portion is formed at a rear end of a first blade portion having a length in a front-rear direction and a second rotating body which is connected to the first rotating body to be able to rotate while crossing the first rotating body about a hinge shaft and in which a second handle portion is formed at a rear end of a second blade portion having a length in the front-rear direction, wherein the first handle portion includes a first holding tool having a front end coupled to the rear end of the first blade portion and a first finger insertion hole formed through both sides of the first holding tool to be orthogonal to a longitudinal direction of the first blade portion and formed to allow one or more fingers excluding a thumb to be inserted, and the second handle portion includes a second holding tool located at an upper portion of the first holding tool and having a front end coupled to the rear end of the second blade portion and a second finger insertion hole formed through the second holding tool in the front-rear direction to be orthogonal to the first finger insertion hole and formed to allow the thumb to be inserted.