Replaceable Blade Knife Cover Opening Mechanism
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Solution Overview
Problem
Existing knives with automatically replaceable blades face difficulties in safely and swiftly replacing thin blades due to limited blade cartridge door opening and compactness issues, making it hard to place and remove spare blades without risking injury.
Innovation Solution
A knife design with a blade carrier that moves between extended and retracted positions, featuring a peripheral blade cartridge carrier for spare blades, a sliding controlling member, and a locking mechanism that allows the cover to open integrally, enabling convenient and safe blade replacement by sliding the blade frame and using a magnetic element for automatic loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring lock mechanism is used to secure the blade cartridge door, then the blade can be securely locked, but the structure becomes more complex and occupies additional space
Solution Approach 1:
The patent removes the spring lock mechanism from the blade cartridge door assembly, extracting the complex locking component entirely. Instead, a simple blade retention structure is implemented that secures the blade through the cartridge door's inherent design, eliminating the need for separate spring lock components while maintaining blade security.
Solution Approach 2:
The blade retention function is segmented from the door opening mechanism. The cartridge door is designed with integrated retention features that work independently of complex locking mechanisms, dividing the security function into simpler structural elements rather than relying on a unified spring lock system.
2Device complexity
If the blade cartridge door pivot is kept closely engaged with the housing to minimize gaps, then the structure is compact, but the door can only open to around 90 degrees making it difficult to place and remove spare blades
Solution Approach 1:
The patent changes the door opening dimension from a limited rotational arc (90 degrees) to a fully open configuration. The cartridge door is designed to open completely away from the housing, utilizing additional spatial dimension to achieve full opening while maintaining compact closed position through optimized hinge placement and door geometry.
Solution Approach 2:
The door mechanism transitions from a constrained rotational movement to a dynamic opening capability that allows the door to swing fully open. The hinge design and mounting structure enable the door to adapt its position from a compact closed state to a fully open state for easy blade access, providing dynamic operational flexibility.
3Device complexity
If the blade cartridge door opens only to 90 degrees, then the pivot and housing remain closely engaged, but the thin blade becomes easy to lose and can hurt users
Solution Approach 1:
The blade retention function is segmented from the door opening limitation. The cartridge door incorporates integrated retention features that secure the thin blade independently of the door's opening angle, allowing the door to open fully while maintaining blade security through separate retention mechanisms built into the door structure.
Solution Approach 2:
The design incorporates beforehand cushioning by implementing redundant blade retention features within the cartridge door structure. These retention features are designed to prevent blade loss even when the door is fully open, providing a safety buffer that prevents the thin blade from becoming loose and potentially injuring users.
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
Facilitates easy and safe replacement of blades by allowing the cover to open fully, providing ample space for spare blade insertion and automatic loading, enhancing user safety and operational simplicity.
Implementation Method 1
using a magnetic element for automatic loading
Data Source
AI summary
The present invention publishes a knife with a replaceable blade, comprising a housing, a cover arranged on the housing and a blade carrier arranged between the housing and the cover, characterized in that, a blade which can move between an extended position and a retracted position is installed on the blade carrier, and a blade cartridge carrier is arrange around the periphery of a position adjacent to the retracted position of the blade, the blade cartridge carrier is provided with an internal space of a blade shape to place spare blades. Wherein, the cover can be connected with the housing in an open type to fix the blade carrier between the cover and the housing.