Gardening Scissors Handle Conjugation via Composite Locking
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Solution Overview
Problem
Conventional gardening scissors suffer from weak conjugation strength, leading to separation of blades from handles under reverse forces and concentration of stress on plastic sleeves, causing wear and deformation.
Innovation Solution
The design incorporates two blades with perforations, connecting blocks with half-shell bodies and covers that form an oval tube for handles, featuring locking mechanisms and buffer bodies to distribute forces and enhance conjugation strength, while being manufactured as separate components to simplify production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional plastic sleeves are used to cover the conjugating unit, then the assembly process is simple, but the conjugation strength is weak and the sleeves are prone to wear and deformation under stress
Solution Approach 1:
The patent replaces the single material plastic sleeve with a composite structure consisting of a metal conjugating unit and a plastic cover. The metal conjugating unit provides the necessary strength and rigidity to withstand reverse forces, while the plastic cover maintains the simplicity of the assembly process and provides protective coverage. This composite approach resolves the contradiction by combining the advantages of both materials.
Solution Approach 2:
The patent divides the original single plastic sleeve component into two separate parts: a metal conjugating unit and a plastic cover. This segmentation allows each component to be optimized for its specific function - the metal unit for strength and the plastic cover for ease of assembly and protection - thereby resolving the contradiction between manufacturing simplicity and conjugation strength.
2Device complexity
If the conjugating unit is made as a single integrated piece, then the structure is simple, but the stress concentrates on specific locations causing deformation
Solution Approach 1:
The patent segments the conjugating unit into multiple functional components: a metal conjugating unit with locking structures and a separate plastic cover. This segmentation distributes the stress across multiple components and connection points rather than concentrating it at a single location, thereby preventing deformation while maintaining reasonable structural simplicity.
Solution Approach 2:
The patent applies different material properties and structural characteristics to different parts of the conjugating assembly. The metal conjugating unit uses rigid materials and locking mechanisms at critical stress points, while the plastic cover provides distribution and protection. This local differentiation of quality resolves the contradiction by strengthening specific areas without overly complicating the overall structure.
3Ease of operation
If the sleeve opening is enlarged to facilitate blade insertion, then the ease of operation is improved, but the conjugation is adversely affected
Solution Approach 1:
The patent separates the functions of blade insertion and conjugation by using a metal conjugating unit with a precise locking mechanism rather than relying on a large plastic sleeve opening. The metal unit provides a secure fit that maintains conjugation quality while the overall design remains user-friendly, resolving the contradiction between ease of operation and conjugation quality.
Data Source
AI summary
Gardening scissors include two blades facing each other, two connecting blocks, two covers and two handles, wherein each blade is equipped with a perforation at a middle section, and a locking board is extended from one side of rear end of two blades. The connecting blocks have a (half) shell body facing the cover, and a receiving slot with half-oval shape extending from rear end of the shell body. Front end of the receiving slot has a stopping edge, one side of which has a side wing extending therefrom. The cover is symmetrically disposed to face the shell body, so that a second receiving slot, a second stopping edge, a second side wing and a second locking hole are formed on the cover. One end of the handle has an anti-slippery sleeve and the other end has a through hole.