Folding Knife Spring-Arm Storage for Quick Blade Replacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing knives lack a convenient and secure mechanism for storing and replacing worn or broken blades, necessitating external sources for replacement blades.
Innovation Solution
A folding knife design with a liner and spring arm mechanism that secures replacement blades within the handle cavity and allows easy removal when needed, using a pivotable blade holder and a spring arm that locks and unlocks to restrain or release the second blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a replacement blade storage mechanism is added to the knife handle, then blade replacement convenience is improved, but device complexity increases
Solution Approach 1:
The replacement blade is nested within the handle cavity, stored inside the existing handle structure. The liner with spring arm mechanism is integrated within the handle, creating a compact nested arrangement that provides blade storage and replacement functionality without significantly increasing external dimensions or overall complexity.
Solution Approach 2:
The spring arm mechanism automatically engages with the replacement blade's notch to secure it in place, and can be manually actuated to release the blade for replacement. This self-contained mechanism eliminates the need for external tools or complex fastening systems, allowing users to replace blades independently.
2Reliability
If a spring arm locking mechanism is used to secure the replacement blade, then blade security is improved, but ease of blade removal deteriorates
Solution Approach 1:
The spring arm mechanism transitions between two dynamic states: a locked position where the spring arm engages the blade notch to secure the blade, and an unlocked position where the spring arm disengages to allow blade removal. This dynamic switching capability provides both secure retention and easy release through a simple manual actuation motion.
3Object-affected harmful factors
If the blade holder is made pivotable between extended and folded positions, then safety is improved, but device complexity increases
Solution Approach 1:
The blade holder is segmented from the handle, allowing it to pivot independently between extended and folded positions. This segmentation enables the cutting edge to be controlled separately from the handle body, providing safety by allowing the blade to be retracted into the handle cavity when not in use, while maintaining operational simplicity through a single pivot joint.
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 quick and secure replacement of blades within the knife, ensuring continuous use without the need for external supplies and enhancing user convenience.
Implementation Method 1
The liner is between the pair of handle members (e.g., within the handle cavity) and includes a spring arm that is movable between a locked position and an unlocked position
Data Source
AI summary
A knife with a replacement blade stored within the knife is provided. The knife allows the replacement blade to be easily and quickly accessible. An arm is movable between a locked and unlocked position. In the locked position the arm interfaces with the replacement blade to restrain the replacement blade from being removed.