Adjustable Grip Hair Scissors for Ergonomic Hand Fit
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Solution Overview
Problem
Existing hair scissors designs are not adaptable to a wide variety of hand sizes, potentially leading to discomfort and increased risk of musculoskeletal disorders due to limited hand/wrist movement and poor grip compatibility.
Innovation Solution
A pair of scissors with a bent first shank and an elastically deformable grip that can be slidably adjusted to accommodate different finger sizes, combined with a cradle and retaining abutment for improved thumb stability, allowing for better force transmission and reduced slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed grip design is used on the first shank, then the manufacturing is simple, but the adaptability to different hand sizes is poor
Solution Approach 1:
The grip is made elastically deformable and can be compressed along the first shank to adjust its position. This dynamic adjustment allows the grip to adapt to different finger sizes and hand configurations, transforming a static structure into an adaptable one that maintains secure contact with various hand types.
Solution Approach 2:
The grip's position parameter along the first shank is made variable through elastic deformation. By changing the compression force applied to the grip, its position can be adjusted to accommodate different hand sizes and finger lengths, thereby improving adaptability without requiring multiple fixed designs.
2Ease of operation
If the grip position is fixed on the first shank, then the structure is simple, but the comfort for various finger lengths is reduced
Solution Approach 1:
The grip is designed as an elastic element that can dynamically adjust its position along the first shank based on the operator's hand size and finger length. This dynamic positioning capability enhances comfort by allowing each user to customize the grip location, rather than being constrained to a fixed position.
Solution Approach 2:
The elastic grip automatically adjusts to the appropriate position through self-compression by the user's fingers. The user simply inserts their fingers and the elastic material deforms to conform to their specific hand dimensions, providing a self-adjusting mechanism that improves comfort without complex controls.
3Reliability
If a simple cradle design is used for the thumb, then the manufacturing is easier, but the thumb stability and force transmission are insufficient
Solution Approach 1:
The cradle is designed with an asymmetric bent shape that specifically conforms to the anatomy of the thumb. The bend in the cradle creates a non-symmetric structure that provides targeted support and stability for the thumb during cutting operations, improving reliability by matching the natural curvature and positioning needs of the thumb.
Solution Approach 2:
The cradle features localized bending and shaping at specific points to enhance thumb retention. Rather than a uniform simple arc, the cradle has localized geometric modifications that provide enhanced stability where needed, balancing manufacturing complexity with improved thumb support and force transmission.
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
The solution enables the scissors to be easily adapted to various hand sizes, reducing the risk of musculoskeletal disorders and improving comfort during cutting operations by providing a secure and adjustable grip.
Implementation Method 1
le grip 6, fait en matériau élastiquement déformable
Data Source
AI summary
A pair of scissors has two shears movably mounted to pivot about an axis, each of the shears having a blade (3) extended by a shank (4, 5). The first shank (4) is covered by a grip in the form of an elongate body that is provided with a lateral opening (8) and that is suitable for being inserted transversely between two fingers of a hand to a position where it bears against the crook where the two fingers meet. The second shank (5) is terminated by a half-ring forming a cradle (10) for receiving the thumb. The first shank (4) is a bent shank. The lateral opening (8) in the elastically deformable grip extends into the inside of the grip forming a sheath into which the first shank (4) can be inserted in adjustable manner by slidable movement. The end of the cradle (10) that is closer to the first shank (4) is bent towards the inside of the cradle to form an abutment (11) for retaining the thumb.