Quick-Release Tool Bit Holder With Spring-Biased Locking
Find Innovative SolutionsGenerate Solutions
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 that biases the outer sleeve to secure the tool bit, allowing for tool bit insertion and secure locking without tools, and easy release by aligning a channel with ball detents for removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a quick-release mechanism is used to enable tool bit changes during work operation, then the productivity is improved, but the device complexity increases due to the need for additional locking and release components
Solution Approach 1:
The locking mechanism is divided into two independent detents: a first detent for primary locking and a second detent for release control. This segmentation allows the quick-release function to be achieved through simple relative movement between the inner and outer sleeves, reducing overall mechanism complexity while maintaining high productivity
Solution Approach 2:
The inner sleeve is nested within the outer sleeve, with the first detent engaging the outer sleeve's locking surface and the second detent controlled by the inner sleeve's movement. This nested arrangement allows both locking functions to be integrated in a compact structure, improving tool bit change speed without proportionally increasing device complexity
2Reliability
If ball detents are used to axially secure tool bits, then the reliability of tool bit retention is improved, but the ease of operation deteriorates because tools are required for bit changes
Solution Approach 1:
The mechanism transitions from a static ball detent system to a dynamic system where the inner sleeve can move axially relative to the outer sleeve. This dynamic movement allows the second detent to disengage from the tool bit's rear surface, enabling tool-free release while the first detent maintains reliable retention during operation
Solution Approach 2:
The inner sleeve acts as an intermediary element between the outer sleeve and the tool bit. It transmits the release action by moving axially to disengage the second detent, thereby enabling easy tool bit removal without requiring external tools while maintaining secure locking through the first detent
3Reliability
If multiple detents are used for secure locking, then the reliability is improved, but the device complexity increases due to additional components
Solution Approach 1:
The inner sleeve serves multiple functions: it houses the longitudinal bore for tool bit reception, contains the second detent for release control, and transmits axial movement to disengage the locking mechanism. This multi-functionality allows two detents to work together in a coordinated manner, improving reliability without proportionally increasing device complexity
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 quick, tool-free bit changes and secure locking of tool bits within the holder, ensuring efficient operation with rotary power tools.
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.