Rotating Shaft Clamping Mechanism for Removable Tool Heads
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Solution Overview
Problem
Existing tool heads are difficult to attach and detach from handles, particularly when handles are not precision formed, and often require additional tools or precise machining, limiting their versatility and usability.
Innovation Solution
A tool head with a clamping apparatus that allows easy attachment and detachment from various handle types, including roughly formed handles, using a rotating shaft mechanism with clamps that compress and decompress to secure and release the handle, enabling the tool head to be used as a multi-tool when not attached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wedge fixation is used to attach tool head to handle, then the attachment is permanent and reliable, but the handle must be exactly formed and the tool head cannot be easily removed
Solution Approach 1:
The patent applies a dynamic fastening system using a lag screw that can be tightened or loosened at will. The screw thread mechanism allows the attachment to transition between locked and unlocked states, enabling both secure attachment during use and easy removal when needed, without requiring permanent fixation or precise handle shaping.
Solution Approach 2:
The attachment mechanism changes the fastening parameter from fixed (wedges) to adjustable (lag screw tension). By varying the screw tightness, the user can control the attachment strength, allowing for both secure operation and easy detachment, while accommodating handles of varying precision without requiring exact fits.
2Manufacturing precision
If precision machining is performed on handle to fit tool head, then the attachment fits tightly, but additional tools and machining time are required
Solution Approach 1:
The lag screw mechanism performs the function of both fastening and handle preparation. The screw threads self-tap into the handle material, creating their own engagement features without requiring pre-drilled holes or precisely machined slots. This eliminates the need for specialized machining tools and operations while achieving secure attachment.
Solution Approach 2:
The attachment system separates the fastening function from the handle structure. Instead of requiring the handle to be precisely shaped to fit the tool head, the lag screw provides the precise positioning and securing function, allowing the handle to be simpler and less precisely formed while maintaining secure attachment.
3Ease of operation
If threaded fasteners are used to allow removable attachment, then the handle can be removed, but a second set of tools is required for installation and removal
Solution Approach 1:
The lag screw serves multiple functions: it acts as both the fastening element and the removal mechanism. The same screw that secures the handle during use is used to remove it by simply backing it out. This eliminates the need for separate installation and removal tools, making the system universally operable with a single tool type.
4Ease of operation
If lag screw is used to spread handle sides against tool body, then handle can be easily unscrewed for removal, but exact shaping and additional machining are still required
Solution Approach 1:
The lag screw threads self-form the engagement features directly into the handle material during installation. The screw threads cut their own path through the wood, creating the necessary engagement without requiring pre-machined slots or precisely shaped recesses. This allows easy removal by unscrewing while eliminating the need for precise handle shaping or additional machining operations.
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 easy attachment and detachment from any handle type without additional tools, allows for handle crafting in the field, and provides compact storage when not in use, enhancing usability and versatility for survival or emergency situations.
Implementation Method 1
a clamp that is movable between a deployed position in which the clamp applies a compressive force to the handle and thereby attaches the handle to the tool head, and a nested position in which the clamp is received within the tool head
Implementation Method 2
a rotating shaft mechanism with clamps that compress and decompress to secure and release the handle
Data Source
AI summary
A tool head for easy attachment and detachment to a handle is provided for configurations such as axes, picks, shovels, sledges, hatches, and hoes. The tool head includes two clamps, one clamp being threadingly engaged on a shaft that freely rotates within the tool head. To attach the tool head to a handle, the user rotates the shaft which moves the clamps together and compresses the handle there between first clamp moves towards a second clamp. To detach, the shaft is counter rotated thereby decompressing the handle. When detached from a handle, the clamps turn and nest in two cutouts within the tool head allowing for compact storage or packing. Integrally formed features that include scraper, blade, wrenches, gut hook, cord cutter, carabineer, and the like provide the user in the field needed tools when fashioning a handle from a sapling or stick.