Quick Release Hand Tool with Non-Circular Interchangeable Work Heads
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Solution Overview
Problem
Existing hand tools with interchangeable work heads face challenges such as high costs, cumbersome storage, and susceptibility to damage, particularly due to permanent attachment of handles and work heads, which limits their durability and usability.
Innovation Solution
A hand tool system featuring a handle with a socket having a non-circular cross-section and a quick release mechanism that securely engages and disengages work heads with a matching non-circular shaft and locking groove, preventing rotation and ensuring robust attachment without loose parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handles and work heads are permanently attached (bonded, welded, or otherwise very permanently attached), then the tool structure is strong and stable, but the work head cannot be replaced when the handle fails, and storage and transportation of multiple tools is burdensome
Solution Approach 1:
The tool is divided into two separable components: a handle with a coupling element and a work head with a connecting member. This segmentation allows the work head to be detached and replaced when the handle fails, while maintaining a strong connection during use through the coupling mechanism comprising a coupling element with prongs and a connecting member with slots and locking features
Solution Approach 2:
The coupling element and connecting member are designed with universal compatibility across different work heads and handles. The standardized interface allows a single handle to work with multiple different work heads (shovel, hoe, pitch fork, rake, etc.), and vice versa, eliminating the need for multiple dedicated tools
2Adaptability or versatility
If multiple hand tools are kept for different tasks, then task-specific functionality is achieved, but transportation and storage become burdensome and tools may become intertwined
Solution Approach 1:
By designing a universal coupling system where one handle can accept multiple different work heads, the user needs only one handle to perform multiple tasks. The handle can be quickly coupled with different work heads (shovel, hoe, pitch fork, rake, etc.) depending on the task requirements, replacing the need to transport and store multiple separate tools
3Adaptability or versatility
If screw-based attachment mechanisms are used (as in U.S. Pat. No. 1,530,225), then work heads can be interchanged, but torsion during use can inadvertently release the work head and loose parts may be lost
Solution Approach 1:
The coupling element acts as an intermediary mechanism between the handle and work head, providing a secure mechanical connection that prevents inadvertent release. The coupling element with its prongs and the connecting member with slots and locking features create a positive mechanical engagement that resists torsional forces during use, eliminating the reliability issues of screw-based mechanisms
4Ease of repair
If replacement handles are provided for failed tools, then the tool can be repaired, but the replacement handles often require modification or customization to fit the old work head
Solution Approach 1:
The standardized coupling element and connecting member design ensures that replacement handles are direct replacements without requiring modification. The universal interface means any handle with the coupling element can work with any work head having the connecting member, eliminating the need for customization or modification during repair
Data Source
AI summary
Provided is a system and method for a hand tool with a plurality of quick release work heads. The hand tool includes a handle having a socket having a first longitudinal axis and an inner cavity extending rearward from an open distal end, the inner cavity having a first non-circular cross section transverse to the first longitudinal axis, the socket further having a quick release transverse to the first longitudinal axis, the quick release releasably disposing a locker transversely across a portion of the inner cavity. The hand tool also includes at least one work head having a second longitudinal axis and a shaft having a second non-circular cross section concentrically conforming to the first non-circular cross section of the inner cavity, the shaft further having a locking groove transverse to the second longitudinal axis and disposed to engage with the quick release locker when the shaft is disposed within the socket of the handle. An associated method of use is also provided.