Scissors with Biasing Mechanism for Safe Simultaneous Sharpening
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Solution Overview
Problem
Conventional scissors with a closed configuration that allows simultaneous sharpening are difficult to sharpen safely, as the cutting edges can be exposed, posing a risk to users.
Innovation Solution
Incorporating a biasing mechanism, such as a spring or elastomeric member, to keep the cutting edges of scissors blades from being exposed unless intentionally moved into a sharpening position, combined with a sharpening device that positions the blades for safe sharpening, ensuring the blades are only sharpened when deliberately manipulated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutting edge of each blade is level with or projects beyond the back edge of the other blade to enable simultaneous sharpening, then the sharpening efficiency is improved, but the user safety deteriorates due to risk of accidental contact with sharp edges
Solution Approach 1:
The scissors incorporate a biasing mechanism that dynamically changes the blade configuration between closed and sharpening positions. The blades are biased toward a closed condition for safety during normal use, but can be deliberately moved to a sharpening condition where cutting edges are exposed for simultaneous sharpening, thus resolving the contradiction between safety and sharpening efficiency
Solution Approach 2:
The biasing mechanism preliminarily positions the blades in a closed condition where cutting edges are protected before any sharpening operation. This preliminary protective state ensures user safety, while the system allows deliberate transition to the sharpening position when needed, balancing safety and efficiency
2Object-affected harmful factors
If the back edge of each blade projects beyond the cutting edge of the other blade in closed condition to protect users, then user safety is improved, but the sharpening difficulty increases as blades must be physically separated for sharpening
Solution Approach 1:
The system dynamically transitions between two blade configurations: a closed condition with back edges projecting for safety during normal use, and a sharpening condition where blades are positioned for simultaneous sharpening. The biasing mechanism enables this dynamic switching, resolving the contradiction between safety protection and sharpening accessibility
Solution Approach 2:
The scissors design incorporates multi-functionality by enabling the same blade assembly to serve both safety protection (closed condition with projected back edges) and efficient sharpening (sharpening condition with exposed cutting edges). The biasing mechanism facilitates this dual functionality without requiring separate sharpening tools or complex disassembly procedures
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 allows for simultaneous sharpening of scissors blades while maintaining user safety by keeping the cutting edges protected from accidental exposure, reducing the risk of injury and enabling efficient sharpening through a dedicated sharpening device.
Implementation Method 1
a biasing means for biasing the blades away from the sharpening condition towards the closed condition
Data Source
AI summary
The invention relates to scissors and a sharpening device. The scissors include two blades, each blade having a cutting edge and a back edge which respectively form opposite longitudinal edges of the blade. A pivot connects the two blades for relative movement of the blades between an open condition in which the cutting edge of each blade are apart and a closed condition in which each blade are substantially adjacent and the back edge of each blade projects beyond the cutting edge of the other blade. The blades also include a sharpening condition in which the cutting edge of each of the blades can be sharpened. A biasing means is included for biasing the blades away from the sharpening condition towards the closed condition and/or the open condition. The sharpening device is for scissors including two blades having a cutting edge. The sharpening device includes a hollow housing for receiving the blades of the scissors, a pair of positioning units within the housing arranged in an opposed relationship to receive the blades therebetween when the scissors are inserted into the housing, and a pair of sharpener units located within the housing arranged in an opposed relationship to contact the blades therebetween.