Rapid Change Chuck Adapter for Jaw-to-Collet Switching

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Solution Overview

Problem

Current CNC lathe and mill equipment require significant downtime and manual effort to switch between jaw chucks for larger diameters and collet holders for smaller diameters, posing safety risks and inefficiencies due to the heavy weight and confined space of standard chucks.

Innovation Solution

A rapid change chuck adapter that allows the chuck to remain on the machine, enabling seamless switching between jaw and collet arrangements, reducing installation and uninstallation time to seconds, and weighing only 12 pounds compared to 50-120 pounds for standard chucks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If standard chucks are used to hold stock material, then the chuck can hold larger diameter items, but the chuck weighs 50-120 pounds and must be removed to use smaller diameter collets

Engineering Contradiction:

Improveability to hold different diametersVSAvoidchuck weight

Core Design Contradiction:

Adaptability or versatilityVSWeight of moving object

Solution Approach 1:

The chuck system is divided into two separate components: a heavy-duty chuck for large diameter work and a lightweight collet holder for small diameter work. These components are kept separate but can be quickly interchanged at the machine tool, eliminating the need to handle the entire heavy chuck when switching to smaller diameters.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A quick-change mechanism serves as an intermediary system between the machine tool and the two different holding devices (chuck and collet holder). This mechanism enables rapid exchange of the holding devices without requiring manual removal and installation of the heavy chuck, thus reducing operator exposure to safety risks.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the entire chuck must be removed to switch to collet holder, then smaller diameter bars can be machined, but the process takes half an hour to a full hour

Engineering Contradiction:

Improveability to machine different diametersVSAvoiddowntime for changing holding devices

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

Both the chuck and collet holder are prepared in advance and can be quickly exchanged using a pre-designed quick-change mechanism. The holding devices are kept ready for interchange, eliminating the time-consuming process of manually removing and installing the entire chuck assembly.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system transitions from a static, fixed chuck installation to a dynamic, quickly interchangeable system. The quick-change mechanism allows the holding devices to be exchanged in seconds rather than hours, enabling the system to adapt dynamically to different machining requirements.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If heavy chucks are removed and reinstalled frequently, then different holding devices can be used, but worker safety is compromised in the confined space

Engineering Contradiction:

Improveability to switch holding devicesVSAvoidsafety risks to operators

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The heavy chuck is extracted from the frequent exchange operations. Instead of removing and reinstalling the entire heavy chuck, only the lightweight collet holder is installed when small diameter work is needed. This extraction eliminates the safety risks associated with handling heavy equipment in confined spaces during frequent changes.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system uses a lightweight, temporary collet holder for small diameter work instead of the heavy permanent chuck. This temporary holding device is designed for quick installation and removal, eliminating the need to handle heavy equipment during exchanges and thereby improving operator safety.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

4Adaptability or versatility

If jaws are machined to fit different diameters, then the chuck can accommodate various sizes, but the jaws only cover a certain range and customarily are on the larger side

Engineering Contradiction:

Improverange of diameters that can be heldVSAvoidcomplexity of jaw machining and replacement

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The jaw machining complexity is segmented into a separate, fixed component (the chuck jaws) that is optimized for large diameter work. For small diameter work, a completely different holding mechanism (collet holder with collets) is used, eliminating the need to re-machine jaws for different diameter ranges.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system achieves universality by having two specialized holding devices: the chuck with jaws for large diameter work and the collet holder with interchangeable collets for small diameter work. Each device is optimized for its specific diameter range, and the quick-change mechanism allows the system to function universally across both ranges without requiring complex jaw adjustments.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12539545B2Rapid change chuck adapter

Publication Date: 2026.02.03 SETH DAVIDIAN

AI summary

A rapid change chuck adapter system includes a chuck adapter that is removably attachable to the chuck in place of removed chuck teeth. The chuck adapter is operable to engage a collet such that an operation of the chuck as if the chuck teeth were not removed operates the collet via the chuck adapter.