Eccentric Pin Joint Scissors for Cardboard Cutting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional scissors configurations hinder efficient cutting of cardboard and similar materials due to the pin joint's location at the intersection of blade portions, requiring significant force and making it difficult to continue cutting as the cut material abuts the pin joint.
Innovation Solution
A pair of scissors with a pin joint positioned outside the intersection of the blade portions, featuring protruding portions that extend beyond the blade line width, allowing for efficient cutting with lighter force and preventing the pin joint from obstructing the cutting process, with a longer blade line on the first blade portion and a recessed valley portion on the second blade portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pin joint is positioned at the intersection of blade portions, then the structure is simple and easy to manufacture, but the cutting efficiency is low and significant force is required
Solution Approach 1:
The pin joint is repositioned from the intersection point of blade portions to an eccentric position outside the blade width range, utilizing spatial dimensionality change to resolve the contradiction between simple structure and cutting efficiency
Solution Approach 2:
The position parameter of the pin joint is changed from the intersection point to an eccentric position, altering the geometric parameters to achieve both ease of manufacture and improved cutting efficiency
2Device complexity
If the pin joint is positioned at the intersection of blade portions, then the structure is simple, but the cutting process is hindered when cut material abuts the pin joint
Solution Approach 1:
The pin joint is extracted from the intersection of blade portions and repositioned to an eccentric location, removing the obstruction that caused cut material to abut the joint and enabling continuous cutting operation
Solution Approach 2:
By moving the pin joint to a position outside the blade width range in the lateral dimension, the cut material no longer interferes with the pin joint, allowing uninterrupted cutting
3Volume of moving object
If the fulcrum is shifted within the blade width range, then the structure remains compact, but the pin joint still hinders cutting of cardboard and similar materials
Solution Approach 1:
The pin joint is repositioned from within the blade width range to an eccentric position outside the blade width range, utilizing lateral spatial arrangement to enable cardboard cutting while maintaining compact structure
Solution Approach 2:
The pin joint position is made asymmetric relative to the blade portions, creating an eccentric configuration that enables effective cardboard cutting while maintaining a compact overall structure
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
Enables efficient cutting of cardboard and similar materials with reduced force, as the pin joint does not hinder the cutting process, allowing for easier and more effective cutting by positioning the pin joint below the cutting line.
Implementation Method 1
a pin joint that rotatably joins the first blade portion and the second blade portion to each other at a rotation center positioned in a blade line of the first blade portion
Implementation Method 2
efficient cutting of the object with lighter force
Implementation Method 3
cutting an object by simply rubbing the blades against each other
Data Source
AI summary
Provided is a pair of scissors, which can cut an object efficiently with lighter force, and makes it easy to cut a cardboard and the like since the pin joint does not hinder the cutting. The pair of scissors comprises: a first handle portion operated by a thumb; a second handle portion operated by other fingers; a first blade portion which connects to the first handle portion; and a second blade portion which connects to the second handle portion; first and second protruding portions which protrude the first blade portion and the second blade portion to the second handle portion side from a position where the first blade portion and the second blade portion intersect each other; and a pin joint that rotatably joins both of the first protruding portion and the second protruding portion to each other.