Power Tool Quick-Change Head Locking Structure for Low-Force Stability
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Solution Overview
Problem
Existing handheld power tools require high finger strength for tool holder replacement due to the need for a significant force to expand elastic clamps, and the contact area between metal components is small, leading to weak fixation stability and vibration issues during operation.
Innovation Solution
A head and body rapid replacing structure utilizing a torsion ring with rotating head locking pieces that move in a straight line, allowing for easy locking and unlocking, and incorporating a rotary unlocking mechanism with surface contact for enhanced stability, along with a steering switch key for one-way operation to prevent misoperation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If elastic clamps are used to fix the tool holder, then the tool holder can be detachably assembled, but a greater force is required to expand the elastic clamp which requires higher finger strength and is inconvenient for users
Solution Approach 1:
A cam mechanism acts as an intermediary between the user's pressing action and the elastic clamp. The cam structure converts a small pressing force into a larger unlocking force that expands the elastic clamp, making the operation easier for users with lower finger strength while maintaining the detachable assembly capability
Solution Approach 2:
The elastic clamp transitions from a static locking state to a dynamic unlocking state through the cam mechanism. The clamp can be easily expanded and contracted through the dynamic interaction between the cam and the clamp, reducing the force required for operation
2Device complexity
If metal wire or metal sheet elastic clamps are used, then the structure is simple, but the contact area is small, the tolerance is small, the stability of fixation is relatively weak, and the tool holder has certain vibration when working
Solution Approach 1:
The invention changes the geometric parameters of the clamping interface by introducing a cam mechanism with a larger contact surface. This increases the contact area between the clamp and the tool holder, improving fixation stability and reducing vibration while maintaining structural simplicity
Solution Approach 2:
The cam mechanism is designed to preliminarily position and align the tool holder before the elastic clamp engages. This preliminary action ensures proper alignment and increases the effective contact area, enhancing fixation stability before the final locking occurs
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 solution reduces the operational force required for tool replacement, improves locking stability, minimizes vibration, and simplifies the assembly process, making the tool more convenient and reliable for users of all strengths, including women and others with lower hand strength.
Implementation Method 1
An energy storage device resetting after driving the torsion ring to rotate
Data Source
AI summary
The present invention discloses a head and body rapid replacing structure of a multi-functional power tool and a multi-functional power tool. The rapid replacing structure comprises a body shell; a torsion ring which is rotationally arranged beside a socket in the body shell and of which the axis is at least parallel to that of the socket; a head detachably inserted in a jack of the torsion ring; an energy storage device resetting after driving the torsion ring to rotate; and head locking pieces that can move in a straight line between a first position and a second position along the direction perpendicular to the axis of the torsion ring during the rotation of the torsion ring.