Utility Knife Blade Support Positioning Mechanism
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Solution Overview
Problem
Existing utility knives do not facilitate easy blade changes, as the process is often cumbersome and requires significant user effort to separate and replace blades.
Innovation Solution
A utility knife design featuring a blade support that can be displaced between safety, cutting, and blade-change positions, utilizing a torsion spring to bias the blade support into the safety position, allowing for easy access and removal of the blade in the blade-change position, with stop faces and adjustable spring orientation to optimize movement and force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the blade support is held firmly in the cutting position, then cutting stability is improved, but blade change difficulty increases
Solution Approach 1:
The blade support is designed to be dynamically positionable with distinct stable states: a cutting position for stable operation and a blade-change position for easy blade replacement. The spring mechanism enables transitions between these positions, providing stability when needed and ease of change when required.
Solution Approach 2:
The operation cycle is segmented into distinct phases: cutting position for stable cutting operations and blade-change position for blade replacement. This segmentation allows the system to optimize for either stability or ease of operation depending on the current phase.
2Reliability
If the spring pre tension is increased, then blade retention security is improved, but user comfort deteriorates
Solution Approach 1:
The spring force is applied locally and selectively: strong retention force is provided when the blade support is in the cutting position to secure the blade, while the blade-change position provides relief from this force, allowing easy blade removal without requiring the user to overcome excessive spring tension.
3Device complexity
If the blade support structure is simplified, then device complexity is reduced, but blade retention reliability decreases
Solution Approach 1:
The spring mechanism automatically performs the function of blade retention without requiring additional active components or complex control systems. The spring self-adjusts to provide reliable blade retention in the cutting position while naturally releasing in the blade-change position, achieving reliable retention with minimal structural complexity.
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 effortless blade changes and secure blade retention in cutting positions, ensuring user safety and convenience by allowing the blade to be easily extended and retracted without unpleasant force perception, while preventing accidental blade exposure in the safety position.
Implementation Method 1
The blade support is biased by a spring into the safety position in all cutting positions, with the spring being formed as a torsion spring.
Data Source
AI summary
A utility knife has a housing, a blade, and a blade support carrying the blade and supported on the housing so as to be displaceable in a straight line with the blade between a safety position, a cutting position, and a blade-change position. A torsion spring biases the blade into the safety position.