Tool-Free Grinder Attachment Mechanism for Quick Tool Changes
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Solution Overview
Problem
Existing grinders require cumbersome methods for changing grinding tools, often necessitating external tools that may not be readily available, making the process inefficient and time-consuming, especially when frequent tool changes are needed.
Innovation Solution
A tool-free attachment mechanism for grinders that includes a flange nut and a backing flange, with a spring bias and pivotable handle, allowing for easy mounting and demounting of grinding tools without the need for additional tools, by creating a space for tool installation and using a clamping mechanism to secure the tool in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional threading methods (nuts or fasteners) are used to secure the grinding tool, then the tool can be reliably retained on the spindle, but the process becomes cumbersome and requires external tools like wrenches
Solution Approach 1:
The attachment mechanism is designed to be self-servicing through the cam-action handle system. The user simply inserts the handle into the recess and rotates it, which automatically actuates the cam mechanism to clamp the backing flange against the flange nut, securing the grinding tool without requiring any external tools or complex manual operations.
Solution Approach 2:
The system transitions from a static threaded connection to a dynamic cam-action mechanism. The cam profile converts the rotational motion of the handle into axial clamping force, providing a controlled and reliable attachment process that can be easily initiated and terminated by user action.
2Reliability
If threaded fastening methods are used, then secure tool mounting is achieved, but the process is time-consuming when frequently changing tools
Solution Approach 1:
The flange nut is pre-positioned on the spindle with the backing flange and cam mechanism already assembled. This preliminary arrangement allows the user to simply insert the handle and rotate it to engage the cam action, eliminating the need to assemble multiple components during tool changes and significantly reducing the time required to switch grinding tools.
Solution Approach 2:
The cam-action mechanism provides rapid engagement and disengagement compared to threading operations. The cam profile is designed to quickly transition between open and closed states, enabling fast tool mounting and removal while maintaining secure retention during operation.
3Productivity
If a tool-free attachment mechanism is implemented, then tool changing efficiency is improved, but the device complexity increases with additional components like cam mechanisms and springs
Solution Approach 1:
Multiple functions are merged into a single integrated attachment mechanism. The cam action, spring bias, flange nut, and backing flange work together as one unified system that can be actuated by a single handle rotation, reducing the need for separate components and simplifying the overall structure despite the added functionality.
Solution Approach 2:
The spring is configured to automatically return the backing flange to its biased position against the flange nut after the cam action is released. This self-returning mechanism eliminates the need for manual manipulation of multiple components, reducing operational complexity while maintaining the tool-free advantage.
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 and efficient tool changes, reducing labor and time required for switching grinding tools, thereby enhancing user productivity and convenience by eliminating the need for external tools.
Implementation Method 1
a backing flange axially movable along the output spindle between a first position, in which a space exists to position the grinding tool between the flange nut and the backing flange, and a second position, in which the grinding tool is clamped between the backing flange and the flange nut
Implementation Method 2
The handle is pivotably coupled to the housing between a release position, in which the flange nut portion is displaced from the backing flange portion to create a space for mounting the grinding tool between the flange nut portion and the backing flange portion
Data Source
AI summary
The present invention provides a grinder including a housing, a drive assembly within the housing including an electric motor having a motor shaft, and an output spindle coupled to the motor shaft for rotatably driving a grinding tool. The grinder further includes a tool-free attachment mechanism for selectively mounting the grinding tool to the output spindle for co-rotation therewith including a flange nut threaded to the output spindle, and a backing flange axially movable along the output spindle between a first position, in which a space exists to position the grinding tool between the flange nut and the backing flange, and a second position, in which the grinding tool is clamped between the backing flange and the flange nut.