Movable Grinder Guard for Kickback Protection During Cutting
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Solution Overview
Problem
Working machines, such as grinders, experience kickback during cutting operations due to reaction forces, leading to unintended movement and potential damage to the workpiece or surrounding members, as well as breakage of the tip tool.
Innovation Solution
A working machine with a protection cover that is displaceable between a processing position and a protecting position, biased by a biasing member to automatically cover the outer periphery of the tip tool during kickback, utilizing a movable member and engaging mechanism to ensure the protection cover moves to the protecting position upon occurrence of kickback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the protection cover is configured to expose the tip tool during cutting operations, then cutting accessibility is improved, but safety deteriorates due to kickback risks
Solution Approach 1:
The protection cover is designed to be movable between a first position (exposing the tip tool for cutting) and a second position (covering the tip tool for protection). The cover can dynamically change its position based on operational needs, being exposed during cutting and automatically covering during kickback events, thus resolving the contradiction between accessibility and safety.
Solution Approach 2:
The biasing member automatically returns the protection cover to the protective second position when kickback occurs, without requiring user intervention. The system self-corrects the dangerous exposed state by utilizing the reactive force from kickback to trigger the covering action, thereby eliminating the safety hazard while maintaining operational convenience.
2Object-affected harmful factors
If the protection cover remains in the protective position during cutting, then safety is improved, but cutting accessibility deteriorates
Solution Approach 1:
The protection cover transitions from a static protective barrier to a dynamic component that can be temporarily moved aside during cutting operations. The user can manually position the cover to expose the tip tool when needed, and it automatically returns to the protective position when not in use, thus maintaining both safety and operational accessibility.
3Ease of manufacture
If a fixed protection cover is used, then manufacturing simplicity is improved, but adaptability deteriorates due to inability to respond to kickback
Solution Approach 1:
The protection cover is designed with movable capability through connection to the housing via movable connection mechanisms. This dynamic design allows the cover to respond to kickback forces by automatically moving to cover the tip tool, while the overall structure remains relatively simple and manufacturable, thus achieving both ease of manufacture and adaptability to kickback events.
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 effectively reduces the risk of the tip tool hitting the workpiece or surrounding members and minimizes damage or breakage by automatically covering the tip tool during kickback, ensuring safer and more controlled cutting operations.
Implementation Method 1
the protection cover is biased by a biasing member to be displaced from the processing position to the protecting position
Data Source
AI summary
A working machine includes: an output shaft to which a tip tool is attachable; a housing rotatably supporting the output shaft; and a protection cover attached to the housing so as to cover an outer periphery of the tip tool which is attached to the output shaft. The protection cover is configured to be displaceable between a processing position to expose a part of the outer periphery of the tip tool to thereby allow cutting of a workpiece, and a protecting position to cover the outer periphery of the tip tool more than in the processing position, and is biased by a biasing member to be displaced from the processing position to the protecting position.