Retractable Cutting Tool Blade Holder Guide Rail Locking
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Solution Overview
Problem
Existing retractable cutting tools suffer from poor structural stability, complicated operation, and the inability to automatically withdraw the blade, posing safety risks and convenience issues.
Innovation Solution
A retractable cutting tool design featuring a cutting tool housing with a blade holder and moving device that allows the blade to be adjusted and automatically retracted, using a blade holder moving device with guide rails and an elastic member for proportional blade extension, and a protrusion length control device with stop positions for secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the blade is made freely retractable and extensible like a box cutter, then the blade length can be adjusted as desired, but the lock-up structure becomes weak, stability deteriorates, and the service life shortens
Solution Approach 1:
The blade holder is designed to be movable along the guide rail, allowing dynamic adjustment of blade exposure length. The blade holder can be positioned at different locations along the guide rail and locked in place, providing both adjustability and stability. This dynamic structure replaces the fixed blade design while maintaining reliability through the locking mechanism.
Solution Approach 2:
A guide rail is introduced as an intermediary component between the housing and the blade holder. The guide rail provides a structured path for blade movement and positioning, enabling precise control over blade exposure. This intermediary structure ensures stable and reliable blade positioning while maintaining adjustability.
2Adaptability or versatility
If a box cutter design with free blade movement is used, then blade length can be adjusted, but the operation becomes complicated requiring three steps of unlocking, moving and locking
Solution Approach 1:
The unlocking, moving, and locking operations are merged into a single integrated action. When the user releases the button, the blade holder automatically moves along the guide rail and locks at the desired position in one continuous motion, eliminating the need for separate unlocking, moving, and locking steps.
Solution Approach 2:
The blade holder is designed to automatically lock itself at appropriate positions along the guide rail. The system uses the user's initial action (pressing or releasing the button) to trigger the entire sequence of blade exposure or retraction, with the locking mechanism engaging automatically without requiring additional user intervention.
3Ease of operation
If the blade remains exposed after use like in a box cutter, then the tool is convenient to use, but security risks increase and safety performance deteriorates
Solution Approach 1:
The blade retraction system is designed to automatically retract the blade into the housing when the user releases the button. This self-service mechanism ensures that the blade does not remain exposed after use, eliminating safety risks associated with accidentally touching the blade, while maintaining convenience during the cutting operation.
Solution Approach 2:
The system proactively prevents safety hazards by automatically retracting the blade after use. The button mechanism is designed so that releasing it triggers immediate blade retraction, countering the potential harm of an exposed blade before the user can accidentally contact it.
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 provides a safe, convenient, and stable cutting experience with adjustable blade length, automatic retraction, and extended service life, reducing safety risks and simplifying operation.
Implementation Method 1
an elastic member, one end of which is connected to the cutting tool housing, and the other end of which is connected to the blade holder; when the driving base plate is unstressed, the elastic member resiles to push the blade holder to move away from the blade exit portal
Data Source
AI summary
The present invention provides a retractable cutting tool, which includes: a cutting tool housing, the interior thereof forming a cavity; a blade exit portal, penetrating through the cutting tool housing and communicating with the cavity; a blade holder, moved or locked in the cutting tool housing; a blade, mounted to the blade holder and disposed opposite the blade exit portal; when the blade holder is moved, the front end of the blade protrudes out of the cutting tool housing or retracts into the cutting tool housing through the blade exit portal; a blade holder moving device, for moving the blade holder in the cutting tool housing; and a protrusion length control device, for controlling the protrusion length of the blade outside the cutting tool housing.