Hairdressing Scissors Handle Segmentation for Weight Reduction
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Solution Overview
Problem
The increasing scarcity of skilled workers to apply mirror finishes on hairdressing scissors has led to higher production costs and workload challenges, making traditional scissors expensive and labor-intensive to manufacture.
Innovation Solution
The design incorporates handle portions formed from parallel flat metal or resin plate parts with bridges and rings, allowing for a lightweight and ergonomic structure that reduces the need for a mirror finish, enabling easier assembly and reduced labor costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If mirror finish is applied on surfaces of middle portions and handle portions by highly skilled workers, then design quality is improved, but production cost increases and workload increases
Solution Approach 1:
The patent applies mirror finish to the blade portions (cutting surfaces) during the manufacturing process before assembly, rather than requiring post-assembly polishing by skilled workers. This preliminary application of the finish to critical surfaces reduces the need for manual finishing work on handle portions while maintaining high design quality where it matters most for cutting performance
Solution Approach 2:
The handle portions are designed with functional surfaces that do not require mirror finish for their primary function. The patent recognizes that only the blade cutting surfaces need high-precision mirror finish, while handle surfaces can be manufactured with standard finishes, allowing automated or semi-automated processes to suffice without skilled manual labor
2Strength
If handle portions are formed by casting, then structural integrity is maintained, but weight reduction and design flexibility are limited
Solution Approach 1:
The handle portions are segmented into multiple components: a hollow section enclosing viscoelastic material, plate parts, and bridges. This segmentation allows each component to be optimized independently - the hollow structure reduces weight while the viscoelastic material provides structural reinforcement where needed, achieving both weight reduction and structural integrity
Solution Approach 2:
The patent combines multiple materials in the handle portions: metal or resin plate parts for structural framework, viscoelastic material for damping and reinforcement, and strategic positioning of these materials creates a composite structure that is both lightweight and strong
3Weight of moving object
If hollow section enclosing viscoelastic material is used in handle portion, then weight is reduced, but manufacturing complexity increases
Solution Approach 1:
The hollow section enclosing viscoelastic material is formed as an integral part of the handle portion manufacturing process. By creating the hollow structure and placing the viscoelastic material during the initial forming stage rather than adding it later, the patent reduces assembly steps and overall manufacturing complexity despite the sophisticated internal structure
Data Source
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AI summary
Scissors (1) include a pair of blade bodies (2) in each of which a blade portion (3), an intermediate portion (4) and a handle portion (5) are formed in order from a distal end side. Each handle portion (5) includes flat plate-shaped first and second press bodies (7, 8) which face one another along an axis of a pivot (4b) and which extend parallel to one another in a longitudinal direction of the blade body (2), and cylindrical collars (11, 12) and first and second resin bodies (9A, 9B) bridging the first and second press bodies (7, 8). The first press body (7A) has an extended portion (7d) which extends further toward to the intermediate portion (4) than the second press body (8A) and which is connected to the intermediate portion (4), whereas the second press body (8A) is separated from the intermediate portion (4).