Rotary Tool Chuck Assembly for Multi-Size Hex Bit Clamping
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Solution Overview
Problem
Existing chuck assemblies for rotary power tools either suffer from the limitations of continuously variable designs or are optimized for a single standard size, leading to inefficiencies in weight, size, manufacturing cost, and bit-changing time, especially when dealing with multiple standard hex-shanked bits of different sizes.
Innovation Solution
A chuck assembly with a rotatable chuck body and movable jaws, featuring oblique slots and a collar that engages with threads to securely hold multiple standard-sized bit shanks by rotating and axially moving the collar to align with different thread orientations, allowing quick and secure attachment of bits with varying nominal sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a continuously variable chuck is used to accept multiple bit sizes, then adaptability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The chuck body is divided into multiple discrete jaw sets, each configured for a specific bit size (e.g., 1/4-inch, 3/8-inch, 7/16-inch hex bits). Instead of a continuously variable mechanism, the chuck provides segmented, discrete sizing options that match standard bit dimensions, reducing mechanical complexity while maintaining multi-size capability
Solution Approach 2:
The chuck assembly is designed to perform multiple functions by accommodating different standard bit sizes within a single device. The interchangeable jaw sets allow the same chuck body to securely hold various bit diameters, eliminating the need for multiple specialized chucks while avoiding continuously variable mechanisms
2Device complexity
If a single-size optimized chuck is used, then device complexity is reduced, but adaptability deteriorates
Solution Approach 1:
The chuck system uses separate, interchangeable jaw sets for different bit sizes rather than a single adjustable mechanism. Each jaw set is optimized for specific standard sizes (1/4-inch, 3/8-inch, 7/16-inch), maintaining simple individual designs while providing collective versatility through modular replacement
Solution Approach 2:
The jaw sets are designed as replaceable, relatively simple components that can be quickly swapped between chuck bodies. This approach treats the jaws as consumable or interchangeable parts rather than permanent fixtures, enabling cost-effective multi-size capability without complex adjustment mechanisms
3Adaptability or versatility
If a continuously variable chuck is used, then adaptability is improved, but weight and size increase
Solution Approach 1:
The chuck body weight is reduced by using discrete, fixed jaw sets for each standard size rather than heavy continuously variable adjustment mechanisms. Each jaw set is optimized for its specific size, eliminating the need for oversized components required by universal adjustable designs
Solution Approach 2:
The chuck design changes the adaptation parameter from continuous adjustment to discrete size selection. By providing specific jaw sets for standard bit sizes (1/4-inch, 3/8-inch, 7/16-inch), the system achieves multi-size capability with lighter, purpose-built components rather than heavy universal mechanisms
4Adaptability or versatility
If a continuously variable chuck is used, then adaptability is improved, but manufacturing cost increases
Solution Approach 1:
The manufacturing process is simplified by producing separate jaw sets for different bit sizes rather than manufacturing complex continuously variable adjustment mechanisms. Each jaw set can be manufactured independently using standard machining processes, reducing overall manufacturing complexity and cost
Solution Approach 2:
A single chuck body design serves multiple purposes by accommodating different jaw sets for various standard bit sizes. This universal chuck body reduces the total number of unique components that need to be manufactured, lowering overall manufacturing costs compared to producing multiple specialized chucks or complex adjustable mechanisms
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 attachment of tool bits with standardized shanks of different sizes, reducing the need for multiple chuck assemblies and improving efficiency in bit changes, while maintaining a compact and cost-effective design.
Implementation Method 1
A first plurality of threads is formed on the chuck body or the plurality of jaws, and a second plurality of threads is formed on the collar. The collar is rotatable about the central axis to a first orientation to engage the second plurality of threads with the first plurality of threads
Implementation Method 2
The chuck body has a plurality of slots, each oriented at an oblique angle relative to the central axis. The plurality of jaws is movable along the plurality of slots in response to rotation of the collar
Data Source
AI summary
A chuck assembly for a rotary power tool includes a chuck body rotatable about a central axis. The chuck body has a plurality of slots, each oriented at an oblique angle relative to the central axis. The chuck assembly also includes a plurality of jaws, each movable along a respective one of the slots. The chuck assembly also includes a collar coupled to the plurality of jaws. The collar is selectively engageable with the chuck body such that, when engaged, the plurality of jaws are movable along the plurality of slots in response to rotation of the collar.