Retractable Cutting Tool Blade Lock and Spring Mechanism
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Solution Overview
Problem
Existing small cutting tools, such as scissors and clippers, pose hazards due to sharp edges and require separate carrying cases for protection, which can be lost or misplaced, and are difficult to operate one-handed, especially in situations like fishing where precision cutting is needed.
Innovation Solution
A retractable cutting tool with a blade assembly that can be safely stored in the handle, featuring a blade lock mechanism, lever arms, and finger grips that automatically extend the blades for cutting, and includes a light-emitting diode for illumination and an automatically retracting tether for convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate carrying cases are provided with small cutting tools to protect sharp edges, then protection from sharp edges is improved, but device complexity and risk of loss increase
Solution Approach 1:
The patent integrates the carrying case function directly into the tool housing. The handle body serves as both the structural support for the cutting mechanism and the protective enclosure when blades are retracted, eliminating the need for separate carrying cases.
Solution Approach 2:
The blade assembly is nested within the handle cavity. When not in use, the blades are fully retracted into the handle, with the handle structure providing protective enclosure around the sharp edges, similar to how nested dolls provide protective layers.
2Volume of moving object
If small cutting tools are made compact for easy carrying, then portability is improved, but safety hazards from sharp edges increase
Solution Approach 1:
The tool features a dynamic blade assembly that can transition between extended and retracted positions. The blades move from an exposed state during use to a retracted state within the handle for safety, allowing the compact form factor to maintain both portability and safety.
3Object-affected harmful factors
If folding mechanisms are used to protect sharp parts, then safety is improved, but ease of one-handed operation deteriorates
Solution Approach 1:
The spring-loaded blade assembly automatically opens when the tool is activated and automatically retracts when deactivated. This self-service mechanism eliminates the need for complex manual folding operations, allowing easy one-handed operation while maintaining blade protection.
4Manufacturing precision
If blades are spaced closely together for precise trimming, then cutting precision is improved, but safety from inadvertent contact deteriorates
Solution Approach 1:
The closely spaced blades are integrated into a dynamic assembly that remains enclosed within the handle during transport. The blades only become accessible when deliberately activated, maintaining both cutting precision and safety by controlling when the close-spaced edges are exposed.
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 tool allows for safe carrying without a separate case, enables precise one-handed operation, and provides enhanced visibility for cutting tasks, ensuring safety and ease of use in various applications.
Implementation Method 1
a spring opens the blades automatically
Implementation Method 2
a light-emitting diode for illumination
Data Source
AI summary
A cutting tool includes a blade assembly with two retractable, opposing blades in a handle shaped for comfortable gripping. The blades may be closed and stowed by being partially retracted into the handle with a continuous motion of a single hand. The blades may similarly be extended and deployed for use with a continuous motion of a single hand. Each blade is formed with a shearing edge and a lever arm. Each lever arm is formed with a slot for engaging a blade locking tab joined to a cover for the handle. When the blade assembly is retracted into the handle, the shearing edges of the blades remain safely closed when the lever arms are released by a person using the tool. The cutting tool includes a retractable tether for preventing loss or damage to the tool should it be dropped.