Keyless Collet Chuck With Detent Click for Bit Clamping Feedback
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Solution Overview
Problem
Rotary power tools lack effective mechanisms for providing tactile feedback when securing tool bits, making it difficult for operators to confirm proper engagement and clamping force.
Innovation Solution
A chuck design featuring a detent member that transmits torque to an inner sleeve, allowing for tactile feedback through axial displacement when the collet is tightened or loosened, utilizing toothed portions and a biasing spring to create a clicking sensation for user confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional collet or chuck is used to secure tool bits, then the tool bit can be held securely for co-rotation, but there is no tactile feedback mechanism to confirm proper engagement and clamping force
Solution Approach 1:
The patent implements a feedback mechanism through a detent member that provides tactile feedback to the operator. When the collet is properly tightened, the detent member engages with the inner sleeve, creating a noticeable click or stop sensation that confirms correct engagement and clamping force to the operator.
Solution Approach 2:
The detent member acts as an intermediary between the collet tightening mechanism and the operator. It translates the mechanical state of the tightened collet into tactile feedback, allowing the operator to confirm proper engagement without directly measuring clamping force.
2Ease of operation
If the detent member is made axially displaceable relative to the inner sleeve, then tactile feedback is created through rotation, but the structure becomes more complex
Solution Approach 1:
The detent member is nested within the inner sleeve structure, with the detent member positioned inside the central aperture area. This nesting arrangement allows the displaceable detent member to provide tactile feedback while remaining integrated within the existing chuck components, minimizing overall structural complexity.
3Power
If the outer sleeve is rotationally fixed to the detent member, then torque transmission is improved for tightening, but the detent member must withstand higher mechanical stresses
Solution Approach 1:
The detent member is pre-configured with its axial displacement capability and engagement features before the tightening operation begins. This preliminary preparation allows the detent member to smoothly transition between engaged and disengaged states, distributing mechanical stresses more evenly and preventing sudden load shocks that could compromise durability.
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 chuck design ensures secure tool bit engagement with tactile feedback, allowing operators to confirm proper clamping force, enhancing user experience and tool bit security.
Implementation Method 1
The detent member is configured to transmit torque to the inner sleeve to tighten or untighten the collet. The detent member is axially displaceable relative to the inner sleeve in response to rotation between the detent member and the inner sleeve to create tactile feedback.
Implementation Method 2
utilizing toothed portions and a biasing spring to create a clicking sensation for user confirmation
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Keyless chuck (14) for portable power tools that produces an audible click or a tactile feedback when a bit is clamped. The chuck (14) includes a base (18) and an inner sleeve (30) threadedly coupled to the base (18). The inner sleeve (30) has a central aperture (20). A collet (26) is disposed within the central aperture (20) and configured to be engaged by a conical portion (30c) of the inner sleeve (30) to be tightened or untightened. An outer sleeve (42b) with a knurled surface (124) surrounds the inner sleeve (30). An axially mobile detent member (ring 34) disposed between the sleeves rotates with the outer sleeve (42b) and is biased axially against a track on the inner sleeve (30) so as to normally transmit rotation to the inner sleeve and so as to slip by a few degrees when the collet is sufficiently tightened, producing a click.