Rotary Chuck with Threaded Sleeve for Secure Bit Holding
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Solution Overview
Problem
Existing tools with push ring mechanisms are prone to accidental disengagement of bits due to the movement of the push ring, leading to the bit becoming detached from the tool connector.
Innovation Solution
A chuck design featuring a mandrel with a non-circular cavity, a slit, and movable components such as a ball and pin, where the rotary sleeve engages the movable sleeve to securely hold bits by rotating and moving the pin and ball into position within the chuck, ensuring firm engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a push ring mechanism is used to hold the bit, then the bit can be quickly inserted and removed, but the push ring can easily be moved by accident causing the bit to detach
Solution Approach 1:
The chuck is divided into multiple functional components: a body with a non-circular cavity for bit insertion, a movable sleeve with threaded engagement for axial movement, and a rotary sleeve with threaded engagement for rotational control. This segmentation allows independent control of bit insertion/removal and locking mechanisms, enabling quick operation while preventing accidental disengagement through the secure threaded locking system.
Solution Approach 2:
The movable sleeve is designed to move axially along the mandrel in response to rotational movement of the rotary sleeve through threaded engagement. This dynamic conversion from rotational to linear motion provides controlled, deliberate bit release requiring intentional user action rather than accidental push ring movement, while maintaining quick removal capability through the streamlined mechanical advantage of the threaded mechanism.
2Reliability
If a tilted locking plate is used to engage the bit, then the bit can be held in position, but the locking plate can be disengaged easily causing the bit to become loose
Solution Approach 1:
The locking mechanism uses a movable sleeve that converts rotational motion into controlled axial movement through threaded engagement with the rotary sleeve. This dynamic mechanism provides secure bit holding during rotation while requiring deliberate intentional action for disengagement, eliminating the accidental disengagement problem of tilted locking plates while maintaining reliable bit position during operation.
Solution Approach 2:
The locking and holding functions are merged into a single integrated threaded mechanism where the movable sleeve and rotary sleeve work together. This combination provides both secure bit retention during use and controlled, deliberate release when needed, eliminating the need for separate locking plate and push ring components that were prone to accidental disengagement.
3Reliability
If a non-circular cavity is used to hold the bit, then the bit can be securely engaged with proper orientation, but the chuck cannot accommodate different types of bits
Solution Approach 1:
The chuck body is designed with a non-circular cavity that can accommodate various non-circular bit profiles (square, hexagonal, etc.) while maintaining secure engagement and proper orientation. The universal design of the cavity allows different bit types to be held reliably, and the system can also accept flat bits through the slit opening, providing multi-functionality and adaptability across different bit configurations.
Solution Approach 2:
The bit holding system is segmented into the non-circular cavity for primary engagement and orientation, and a separate slit opening for flat bit insertion. This segmentation allows the chuck to handle different bit types through appropriate insertion paths while maintaining secure engagement through the non-circular geometry, thereby achieving both reliability and versatility.
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 reliable mechanism to securely hold various bits, preventing accidental disengagement and ensuring they remain attached to the tool, enhancing the tool's usability and reliability.
Implementation Method 1
A movable sleeve is located around and movable along the mandrel and formed with a thread. A rotary sleeve is rotationally located around the mandrel and formed with a thread engaged with the thread of the movable sleeve.
Data Source
AI summary
A tool includes a chuck connected to a handle. The chuck includes a mandrel including a non-circular cavity defined therein, a slit in communication with the non-circular cavity, a first bore in communication with the non-circular cavity, and a second bore in communication with the slit. A bit with a non-circular profile can be inserted in the non-circular cavity. A flat bit can be inserted in the slit. A ball is located in the first bore. A pin is located in the second bore. A movable sleeve is located around and movable along the mandrel and formed with a thread. A rotary sleeve is rotationally located around the mandrel and formed with a thread engaged with the thread of the movable sleeve. By rotating the rotary sleeve, the movable sleeve pushes the ball into the non-circular cavity and the pin into the slit.