Grinding Disc Quick-Clamping for Tool-Free Axial Fixation
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Solution Overview
Problem
Existing abrasive devices for portable machine tools, such as grinding machines, require tools for axial fixation of grinding wheels, which complicates operation and maintenance, particularly in terms of quick changes and secure attachment.
Innovation Solution
A tool-free abrasive device with a securing unit that uses a quick-clamping mechanism, involving a movable hook jaw and axial securing elements, allowing for secure and easy attachment of grinding wheels without the need for screws or threads, enabling quick changes and improved operational comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thread-based securing unit is used for axial fixation, then the attachment is secure and reliable, but the operation becomes complex and requires tools for fixation and changes
Solution Approach 1:
The patent replaces the traditional thread-based mechanical fastening system with a snap-fit mechanism utilizing a movable hook jaw and axial securing elements. The hook jaw engages with the securing unit through a plug-on movement followed by rotational movement, eliminating the need for threaded connections and external tools while maintaining secure attachment.
Solution Approach 2:
The securing unit is designed to be self-contained with the axial securing elements and movable hook jaw working together to automatically secure the receiving unit. The system performs its own fixation function without requiring external tools or additional fastening operations, as the hook jaw's rotational movement alone accomplishes both engagement and locking.
2Reliability
If a thread-based securing unit is used for axial fixation, then the attachment is secure, but the time required for changes and maintenance increases
Solution Approach 1:
The patent replaces the multi-step thread-based fastening process with a rapid snap-fit mechanism. The axial securing elements engage with the movable hook jaw through a simple plug-on movement, followed by a single rotational movement that simultaneously completes the engagement and locking, dramatically reducing the time required for attachment changes and maintenance operations.
3Ease of operation
If a tool-free quick-clamping mechanism is used, then the ease of operation and speed of changes improve, but the device complexity increases due to the movable hook jaw and axial securing elements
Solution Approach 1:
The patent combines the functions of axial securing elements and a movable hook jaw into an integrated quick-clamping mechanism. The axial securing elements are positioned to engage with the hook jaw, and the rotational movement of the hook jaw simultaneously accomplishes both engagement and locking functions, merging multiple operations into a single unified mechanism that simplifies user interaction.
4Device complexity
If a thread-based securing unit is used, then the structural simplicity is maintained, but the operational comfort and efficiency decrease
Solution Approach 1:
The patent substitutes the simple but labor-intensive thread-based system with a mechanically sophisticated quick-clamping mechanism featuring axial securing elements and a movable hook jaw. This substitution trades increased structural complexity for dramatically improved operational comfort, as the new mechanism requires no tools and can be operated with a simple plug-on and rotational movement.
Data Source
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AI summary
The invention proceeds from a grinding-means device, in particular from a grinding-disc device or from a backup-pad device, for arranging at least one grinding means, in particular at least one grinding wheel, on a portable power tool (14), in particular a grinding machine, having at least one receiving unit (18), in particular a grinding disc or backup pad, which is fixable in particular in a thread-free manner on an output unit (16) of the portable power tool (14) and on which at least one grinding means is able to be arranged, and having at least one securing unit (20), formed in particular separately from the receiving unit (18), at least for axially fixing the receiving unit (18) and/or the grinding means to the output unit (16) of the portable power tool (14). It is proposed that the securing unit (20) be provided at least to axially fix the receiving unit (18) and/or the grinding means to the output unit (16) of the portable power tool (14) in a tool-free manner, and/or at least to axially fix the grinding means to the receiving unit (18) in a tool-free manner.