Cam-Driven Folding Scissors for Multipurpose Tools
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Solution Overview
Problem
Multipurpose tools with scissors have been limited to light-duty functionality, lacking the capability to effectively cut through thicker or tougher materials due to their design constraints.
Innovation Solution
A collapsible or folding pair of scissors with a cam-and-follower closure mechanism, where a lever pivots relative to a second blade, and a spring element biases the blades to form a cutting nip, allowing the scissors to transition between a deployed and stowed position within a multipurpose tool handle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If scissors are made light-duty for portability in multipurpose tools, then ease of operation is improved, but cutting capability deteriorates
Solution Approach 1:
The scissors implement a dynamic blade closure mechanism where the blades transition from a parallel configuration during opening to a convergent configuration during closing. The cam surface and follower mechanism create a mechanical advantage that increases blade closing force as the blades approach each other, enabling light-duty scissors to cut through tougher materials effectively
2Volume of moving object
If scissors are made collapsible for compact storage, then volume is reduced, but structural complexity increases
Solution Approach 1:
The scissors utilize a nesting mechanism where the first blade is received within a recess of the second blade when folded, and the lever is received within a recess of the first blade. This nested configuration allows the scissors to collapse into a compact form that fits within the multipurpose tool handle, significantly reducing storage volume while maintaining structural integrity through the nested support relationships
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 the scissors to operate effectively in a deployed position for cutting and fold compactly within the tool, reducing the need for multiple tools and enhancing usability by providing a robust cutting capability in a multipurpose tool.
Implementation Method 1
A spring element is aligned with and engaged with a driving element of the first blade in response to the cutting tool being disposed in the deployed position. The spring element biases the first blade away from the second blade in response to the cutting tool being disposed in the deployed position
Implementation Method 2
One of the first blade and the lever defines a cam surface, and the other of the first blade and the lever defines a follower. In response to the lever being driven in a first direction, the follower moves relative to the cam surface, closing the first blade with respect to the second blade to form a cutting nip
Data Source
AI summary
A cutting tool is provided which may include a first blade and a second blade, where the first blade is coupled to the second blade at a first pivot point, where the first blade defines a cam follower and pivots relative to the second blade about a first pivot axis through the first pivot point; and a lever pivotably coupled to the second blade at a second pivot point, where the lever defines a cam surface and pivots relative to the second blade about a second pivot axis through the second pivot point, where the second blade is driven toward the first blade in response to the lever being advanced toward the first pivot point and the cam follower translating along the cam surface.