Rotatable Chuck Clamping Sleeve with Contoured Ramps
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Solution Overview
Problem
Existing chucks for securing cutting tools or work-pieces to machining tools lack an efficient mechanism for secure clamping and easy release, often resulting in inadequate gripping forces and complex operation.
Innovation Solution
A chuck design featuring a clamping sleeve with a contoured surface and rollers that rotate between a releasing and securing position, utilizing ramps and depressions to apply radially inward and outward forces for secure clamping and easy tool insertion/removal, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional clamping mechanisms are used, then gripping force can be achieved, but operation complexity increases and release becomes difficult
Solution Approach 1:
The clamping mechanism transitions from a static gripping state to a dynamic releasing state through rotational movement of the clamping sleeve. The rollers move along contoured surfaces with varying radii, dynamically changing the clamping force from high (when rollers are on inner radius) to low or zero (when rollers are on outer radius), enabling easy release without complex additional mechanisms
Solution Approach 2:
The contoured clamping surface is segmented into multiple sections with different radii of curvature. Each segment corresponds to a specific operational phase: insertion (outer radius), clamping (inner radius), and release (outer radius again). This segmentation allows the single rotational motion to achieve multiple functions sequentially, simplifying the overall mechanism while improving ease of operation
2Reliability
If strong gripping force is applied to secure cutting tools, then tool holding reliability improves, but tool insertion and removal becomes difficult
Solution Approach 1:
The mechanism dynamically adjusts clamping force through rotational movement. During insertion, rollers are positioned on the outer radius providing minimal resistance. Upon tightening, rollers move to the inner radius creating strong gripping force for reliable tool holding. For removal, rollers return to the outer radius releasing the grip, enabling easy tool extraction while maintaining high reliability during operation
3Device complexity
If simple clamping mechanism is used, then device complexity is reduced, but gripping force becomes insufficient
Solution Approach 1:
The contoured clamping surface utilizes spherical geometry with varying radii to amplify gripping force. The inner radius portion creates a mechanical advantage that concentrates force on the tool, while the outer radius portions provide leverage points. This curved surface design generates strong gripping force through geometric principles rather than complex mechanical components, maintaining simplicity while achieving high force
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
The design provides a secure grip on cutting tools or work-pieces with reduced complexity in operation, allowing for easy tool insertion and removal by leveraging the rollers' movement along ramps and into depressions to contract and expand the clamping mechanism.
Implementation Method 1
The contoured clamping surface has a first ramp between a trough and a crest, and a second ramp between the crest and a depression... the first roller rides along the first ramp, passes over the crest and enters the depression... urging the clamping sleeve to apply gripping force
Data Source
Figure 1
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AI summary
A chuck for clamping an article has a receiving portion including a receiving bore having a longitudinal axis L, and a receiving bore inner surface. A clamping sleeve is accommodated in the receiving bore and is rotatable between a releasing position and a securing position. The clamping sleeve has a radially outwardly facing contoured clamping surface provided with one on more clamping segments, each clamping segment having a ramp between a trough and a crest, and a depression on the other side of the crest. Rotating the clamping sleeve within the receiving bore causes one or more rollers associated with each clamping segment to cooperate with the contoured clamping surface to effect the releasing and the securing of the article.