Palm and Finger Handle Geometry for Low-Strain Metal Snips
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Solution Overview
Problem
Traditional metal snips require excessive hand exertion, leading to muscle fatigue and discomfort, prompting operators to misuse the tools in attempts to alleviate these issues, highlighting a need for improved ergonomic design.
Innovation Solution
The development of a metal snips handle with an ergonomic design featuring a pivotally connected palm and finger handle, a purlicue grip, and a finger set with forward and tail finger flanges, which reduces muscle work and prevents hand pinching, incorporating a compound hinge and relief washer system for enhanced comfort and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional metal snips are used, then the tool can perform cutting function, but excessive hand exertion is required leading to muscle fatigue and discomfort
Solution Approach 1:
The handle is divided into two separate handles (first handle and second handle) that can be independently positioned and adjusted. This segmentation allows each handle to be optimized for specific finger placements, distributing the mechanical load more evenly across the hand and reducing concentrated stress points that cause fatigue.
Solution Approach 2:
The handles are made adjustable and reconfigurable, allowing the user to dynamically change the grip configuration based on the cutting task. This dynamic adaptability enables optimal hand positioning for different materials and cutting forces, reducing muscle strain by maintaining ergonomic alignment throughout the cutting stroke.
2Ease of operation
If traditional metal snips are used, then the tool can perform cutting function, but hand pinching and discomfort occur during prolonged use
Solution Approach 1:
Different regions of the handles are designed with specific geometric features (flanges, contours, and surfaces) that correspond to particular finger placements. The first handle has features optimized for certain fingers while the second handle has complementary features for other fingers, creating localized comfort zones that prevent pinching and distribute pressure evenly across the hand.
Solution Approach 2:
The handle design inherently guides proper finger placement through its geometric features, eliminating the need for the user to consciously adjust their grip. The flanges and contours automatically position the fingers in ergonomic locations, preventing pinching before it occurs and enabling comfortable continuous use without active user intervention.
3Ease of operation
If traditional metal snips are used, then the tool can perform cutting function, but operators misuse the tool in attempts to alleviate deficiencies
Solution Approach 1:
The adjustable handles act as intermediaries between the user's hand and the cutting blades. By providing a configurable interface that adapts to the user's anatomy, the handles mediate the interaction in a way that promotes proper technique and reduces the incentive to misuse the tool, as the ergonomic features naturally guide correct usage patterns.
Data Source
AI summary
Hand tools which have an ergonomic using a palm handle and finger handle designs which achieve mechanical efficiency and ease of use. The ergonomic handle is compatible with the muscle movements of an operator using a hand tool reducing muscle strain and pain. Optionally, the palm and finger handles can have ergonomically designed cushions. In an embodiment, the finger handle can have a finger set which has a forward finger flange, a tail finger flange and a pinky grip. The ergonomic handle can also use a relief washer system to achieve a smooth low frictional resistance cutting stroke.