Quick Change Power Tool Chuck Axial Collar Locking

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Solution Overview

Problem

Existing chucks for power tools require time-consuming adjustments to secure or release bits or heads, often resulting in insufficient securing, as they rely on turning an outer housing or using a key, which can be cumbersome and prone to errors.

Innovation Solution

A power tool chuck design featuring a claw assembly with radially movable claw portions, a collar assembly that axially moves to force the claw portions inward, and a locking assembly with a button-actuated locking member, allowing for quick and secure attachment and detachment of bits or heads without the need for manual housing adjustment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional jaw assemblies are adjusted by turning an outer housing or using a key, then the bit or head can be secured, but the process is time-consuming and may fail to sufficiently secure the bit or head

Engineering Contradiction:

Improvesecure attachment of bit or headVSAvoidtime to interchange bits or heads

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The locking member is designed to dynamically transition between locked and unlocked states through axial movement of the collar assembly. The爪 portions radially move between engaged and disengaged positions, enabling rapid secure attachment without time-consuming manual adjustments.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The collar assembly, when axially moved, automatically forces the爪 portions radially inward to engage the bit or head and simultaneously locks the collar in position through the locking member. This self-securing mechanism eliminates the need for separate manual tightening operations.

Inventive Principle:

Principle #25Self-service

2Reliability

If traditional chucks require turning a key or housing to adjust jaw assemblies, then the bit or head can be secured, but the operation becomes cumbersome and complex

Engineering Contradiction:

Improvesecure attachment of bit or headVSAvoidease of adjusting chuck

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The invention extracts and eliminates the traditional key or housing turning mechanism from the chuck assembly. Instead, a simple collar assembly with axial movement directly controls the爪 portions and locking member, dramatically simplifying the operation while maintaining secure attachment.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of rotating components to secure the bit or head, the invention uses axial movement of the collar assembly to radially force the爪 portions inward and lock them in position. This inverted mechanism transforms the traditional rotational adjustment into a linear motion system that is both simpler and more reliable.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS9517510B2Quick change power tool chuck

Publication Date: 2016.12.13 ROBERT BOSCH TOOL

AI summary

A power tool chuck includes at least one claw portion movable from a first position spaced apart from a centerline of the chuck toward a second position located closer to the centerline. The power tool chuck also includes a collar configured such that as the collar moves from a third position to a fourth position, the at least one claw portion is forced from the first position toward the second position. The power tool chuck also includes a locking member movable between a fifth position whereat the locking member locks the collar in the third position and a sixth position whereat the locking member does not lock the collar. The power tool chuck also includes a button movable between a seventh position whereat the locking member is forced into the fifth position and an eighth position whereat the locking member is free to move into the sixth position.