Multi-Size Tool Bit Holder for Quick Bit Changes Without a Chuck

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Solution Overview

Problem

Existing tool bit holders for rotary power tools either require continuously variable chucks, which are heavy, large, and expensive, or are limited to a single standard hex-shanked bit size, making them inefficient for multiple bit sizes.

Innovation Solution

A multi-size tool bit holder design featuring a first and second sleeve for co-rotation, with movable retaining members and a collar, allowing securement of different nominal size bit shanks without the need for continuously variable chucks, enabling quick and secure attachment of various bit sizes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a continuously variable chuck is used to accept multiple bit sizes, then versatility is improved, but weight increases

Engineering Contradiction:

Improveability to accept multiple bit sizesVSAvoidweight of tool bit holder

Core Design Contradiction:

Adaptability or versatilityVSWeight of moving object

Solution Approach 1:

The tool bit holder is segmented into multiple interchangeable sleeves, each configured for a specific bit size. Instead of one complex continuously variable chuck, the system divides functionality across separate simple sleeves that can be quickly swapped based on the bit size required, reducing the weight of any single sleeve while maintaining overall versatility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system achieves universality through a set of standardized sleeves that can handle different bit sizes. Each sleeve is optimized for its specific function, and the collection of sleeves provides universal compatibility with multiple bit sizes without requiring each individual component to be complex or heavy.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a continuously variable chuck is used to accept multiple bit sizes, then versatility is improved, but device complexity increases

Engineering Contradiction:

Improveability to accept multiple bit sizesVSAvoidcomplexity of tool bit holder

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The complex function of accommodating multiple bit sizes is segmented into separate simple sleeves. Each sleeve has a straightforward structure optimized for one bit size, eliminating the need for complex adjustable mechanisms found in continuously variable chucks.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system uses dynamic interchangeability of sleeves rather than a static complex mechanism. The simplicity of each sleeve is maintained while the system as a whole adapts dynamically by swapping sleeves based on the required bit size.

Inventive Principle:

Principle #15Dynamics

3Ease of manufacture

If a single-size bit holder is used, then manufacturing cost is reduced, but versatility deteriorates

Engineering Contradiction:

Improvemanufacturing cost of tool bit holderVSAvoidability to accept multiple bit sizes

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The product is segmented into multiple simple sleeves, each manufacturable with straightforward processes. The simplicity of each individual sleeve maintains low manufacturing costs while the collection provides multi-size capability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system varies the parameter of sleeve size to accommodate different bit sizes. Each sleeve is manufactured with specific dimensional parameters tailored to its intended bit size, allowing cost-effective production while achieving versatility through parameter variation rather than complex design.

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If a single-size bit holder is used, then device complexity is reduced, but adaptability deteriorates

Engineering Contradiction:

Improvesimplicity of tool bit holderVSAvoidability to accept multiple bit sizes

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The system segments the adaptability function into multiple simple sleeves. Each sleeve maintains structural simplicity while the set of sleeves collectively provides the adaptability to handle multiple bit sizes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The collection of sleeves achieves universal compatibility with multiple bit sizes through a standardized design approach. Each sleeve is simple in structure but the system as a whole provides multi-functionality by offering a range of sleeves for different applications.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11292109B2Multi-size tool bit holder for a rotary power tool

Publication Date: 2022.04.05 MILWAUKEE ELECTRIC TOOL CORP

AI summary

A multi-size tool bit holder includes a first sleeve having a first bit holding bore extending along an axis, and a second sleeve coupled for co-rotation with the first sleeve and movable relative to the first sleeve between a first position and a second position. The second sleeve includes a second bit holding bore. A first bit shank of a first nominal size is insertable into the first bit holding bore when the second sleeve is in the second position to secure the first bit shank within the first sleeve. A second bit shank of a second nominal size different than the first nominal size is insertable into the second bit holding bore when the second sleeve is in the first position to secure the second bit shank within the second sleeve.