Ejectable Knife Compartment Solving Single-Handed Access
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Solution Overview
Problem
Existing knives with storage capacity in the handle require two hands to access the stored gear, are prone to gear loss due to separate butt-caps, and necessitate emptying the handle to select tools, which is inconvenient and risky in messy environments.
Innovation Solution
A single-button mechanism that ejects a self-contained compartment from the knife handle using spring pressure, allowing single-digit operation, no butt-cap loss, and easy re-seating without good visibility or functioning fingers, with a diamond hone door for gear storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate butt-cap is used to access gear in the handle, then the gear can be stored in the handle, but the butt-cap can be lost rendering the storage capacity useless
Solution Approach 1:
The compartment is merged with the handle as an integrated unit. The compartment cannot be separated from the handle, eliminating the risk of losing a separate butt-cap while maintaining storage functionality. The compartment is retained within the handle through a retention mechanism that prevents separation.
2Ease of operation
If gear is stored loosely in the handle, then storage capacity is available, but the user must empty all contents to select a specific implement
Solution Approach 1:
The gear storage is segmented into discrete compartments or organized sections within the removable compartment. This allows the user to maintain organization of different implements while keeping them contained, enabling quick selection without emptying the entire handle.
3Reliability
If a separate butt-cap is used to access gear, then gear can be stored securely, but two hands are required to access the gear
Solution Approach 1:
The compartment transitions from a static integrated structure to a dynamic removable unit. The compartment can be ejected from the handle and manipulated with one hand, providing both secure storage when attached and easy access when removed, eliminating the need for two hands to access gear.
4Ease of operation
If the compartment is ejected partially from the handle, then single-digit operation is enabled, but the compartment must be precisely re-seated
Solution Approach 1:
The compartment ejection and re-seating system is designed to be self-aligning. The compartment includes features such as guide rails, alignment pins, or tapered edges that automatically position the compartment correctly during insertion, eliminating the need for precise manual alignment by the user.
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 single-handed access and secure storage of survival or tactical gear, preventing loss and ensuring easy tool selection and re-storage, even in adverse conditions.
Implementation Method 1
The compartment is ejected partially from the knife handle by spring pressure
Data Source
AI summary
A fixed blade knife that is intended for survival or tactical use is provided with a removable, ejectable, self contained compartment for the storage and carriage of survival and/or tactical gear within the handle of the knife. A self contained, removable compartment is superior to a separate butt cap for the handle as a butt cap requires the use of two functioning hands for removal, is not as fast as an ejectable compartment and can be lost rendering the handle useless for the storage and carriage of gear. The self contained compartment eliminates the necessity for a butt-cap, can be ejected quickly with a single digit that may or not be otherwise useless due to injury or environmental conditions. The compartment also serves to contain the gear there-in separate from the knife handle to prevent loss and allow use of said gear by a second individual while the knife itself may be in use by the primary user.