Adjustable Tool Holder With Dynamic Joint Locking
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Solution Overview
Problem
Existing tool holders lack dynamic adjustability and modularity, leading to issues such as loose connections under torsional forces, increased weight and cost, and limited tool head orientation, which hinder ergonomic use and efficiency.
Innovation Solution
A modular tool holder design featuring a joint as an intermediate component between the handle and tool head, utilizing a cable for rotational locking and an octagonal adapter system for secure, easy mounting at 45° increments, allowing for dynamic adjustment and reduced weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a threaded connection is used to couple tool heads and handles, then the connection can be securely attached, but the connection loosens under torsional forces and requires time-consuming screwing operations
Solution Approach 1:
The patent transitions from a static threaded connection to a dynamic locking mechanism featuring a spring-loaded cam and movable locking element. The spring provides continuous pressure to maintain engagement, while the cam mechanism allows rapid locking and unlocking motions, enabling secure attachment in seconds rather than requiring multiple screwing operations
Solution Approach 2:
The patent replaces the traditional threaded mechanical fastening system with a cam-based locking system actuated by a spring mechanism. This substitution eliminates the need for rotational screwing motions and replaces them with a linear actuation of the locking element that engages disengageable locking surfaces, dramatically reducing attachment time while maintaining connection security
2Strength
If a continuous rod is used inside the handle to engage the hinge, then the rod can resist applied forces, but the rod becomes heavy and causes user fatigue
Solution Approach 1:
The patent divides the continuous rod into multiple discrete segments positioned at specific locations within the handle. These segmented rods work in conjunction with a hinge mechanism that distributes force across multiple engagement points, maintaining adequate force resistance while reducing the total amount of rod material required, thereby decreasing overall handle weight and reducing user fatigue
3Ease of operation
If the actuating rod is placed externally on the handle, then the rod can be easily accessed, but the rod is exposed to destructive forces and interferes with natural hand placement
Solution Approach 1:
The patent nests the actuating rod within the hollow interior of the handle, similar to a nested doll structure. The rod is positioned inside the handle's lumen and surrounded by the handle structure that provides protective bracing. This nesting arrangement shields the rod from external destructive forces while the handle's internal geometry provides clearances that allow the rod to be actuated from the exterior through the handle wall, maintaining ease of operation without exposing the rod to harmful factors or interfering with natural hand placement
Data Source
AI summary
An adjustable tool holder that allows releasable mounting of various tool heads like brooms, rakes, shovels, and many others. The tool head angle can be adjusted in two ways: 1) the tool head, with respect to the handle, (supposing the handle is perpendicular to the ground) can be angled dynamically, in a sweeping arc of 270°, with a plurality of locking positions along this are, without interrupting use. This enables the user to instantly adapt the tool orientation for improved ergonomics and access. The dynamic adjustment eliminates the need to pause work to reconfigure the tool, increasing efficiency; 2) The tool head can also be mounted around its axis in approximately 45° increments of 360°.