Spring-Biased Tool Bit Holder for Secure Quick Release
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Solution Overview
Problem
Existing quick-release tool bit holders for rotary power tools often require tools for bit changes and lack efficient mechanisms for secure locking and easy release of tool bits.
Innovation Solution
A tool bit holder design featuring an inner sleeve with a longitudinal bore, an outer sleeve that moves between locking and release positions, and a spring to bias the outer sleeve for secure locking and easy release, utilizing ball detents for axial security and a circumferential groove to limit axial displacement, allowing tool bits to be interchanged without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a quick-release mechanism with ball detents is used, then tool bit interchangeability is improved, but the locking reliability may be insufficient without additional features
Solution Approach 1:
The outer sleeve is designed to move dynamically between locked and release positions, allowing the bit holder to transition from a secure locked state to an easy release state. This dynamic mechanism enables reliable locking during operation while permitting quick tool bit changes when needed.
Solution Approach 2:
The ball detents are nested within radial bores in the inner sleeve, and the outer sleeve surrounds and controls these detents. This nested structure allows the smaller ball detent mechanism to be contained within and controlled by the outer sleeve, achieving both secure locking and easy release.
2Ease of operation
If a spring-biased outer sleeve mechanism is used, then ease of release is improved, but the device complexity increases
Solution Approach 1:
The spring automatically biases the outer sleeve toward the locked position, providing self-locking functionality without requiring user intervention. The user simply needs to overcome the spring force to release, making the system self-regulating and easy to operate.
Solution Approach 2:
The spring mechanism is integrated within the existing sleeve and detent structure, combining the locking function, release function, and biasing force into a single unified mechanism rather than adding separate complex systems.
3Reliability
If multiple detents are used to secure the tool bit, then locking reliability is improved, but the device complexity increases
Solution Approach 1:
The locking function is segmented into multiple ball detents positioned at different locations around the tool bit shank. Each detent independently engages with the shank, providing distributed securement that improves reliability without requiring a single complex locking mechanism.
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
Enables secure locking and easy release of tool bits, allowing for tool bit interchangeability without tools, ensuring reliable operation and user convenience.
Implementation Method 1
a spring positioned between the inner sleeve and the outer sleeve. The spring biases the outer sleeve toward the locking position
Data Source
AI summary
A tool bit holder includes an inner sleeve in which a longitudinal bore is defined in which a tool bit is receivable and a detent is engageable with the tool bit for locking the tool bit within the longitudinal bore. An outer sleeve surrounds the inner sleeve and is movable relative to the inner sleeve between a locking position, in which the detent is engaged with the tool bit for locking the tool bit within the longitudinal bore, and a release position, in which the detent may be disengaged from the tool bit to permit removal of the tool bit from the longitudinal bore. A spring is positioned between the inner sleeve and the outer sleeve. The spring biases the outer sleeve toward the locking position