Angle Grinder Guard Anti-Rotation Locking Mechanism
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Solution Overview
Problem
Existing hand-held power tools with guards lack a secure and anti-rotation mechanism to effectively protect operators from flying debris during tool bursts, as the current adjustable guards do not provide a robust enough connection to prevent rotation and ensure safety.
Innovation Solution
A detachable guard system with a clamping band and anti-rotation lock, featuring a profiled structure that forms a form-fit connection with the machine neck, preventing the guard from rotating during operation and ensuring a secure attachment that withstands operational loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a detachable guard system is used, then ease of operation is improved, but reliability is worsened due to lack of secure anti-rotation connection
Solution Approach 1:
The guard system is divided into detachable components (guard body, clamping band, locking lever) that can be easily assembled and disassembled. The clamping band segments wrap around the machine neck while the locking lever segments engage with profiled structures, providing both ease of operation and secure connection.
Solution Approach 2:
The clamping band is pre-formed with a configuration that allows it to wrap around and engage with the machine neck before final tightening. The locking lever is pre-positioned to engage with the profiled structures on the machine neck, ensuring anti-rotation capability is established before the guard is fully installed and subjected to operational loads.
2Reliability
If a form-fit connection is used, then reliability is improved, but device complexity is worsened
Solution Approach 1:
The profiled structures are localized to specific regions on the machine neck where they engage with corresponding features on the locking lever. This concentrated engagement at key locations provides form-fit connection reliability without requiring complex mechanisms throughout the entire guard assembly.
Solution Approach 2:
The clamping band and locking lever are designed to automatically engage with the machine neck profiled structures through their own geometric configurations. The form-fit connection is achieved through the inherent shape compatibility between components rather than requiring additional fastening elements or complex adjustment mechanisms.
3Reliability
If anti-rotation lock is added, then reliability is improved, but ease of operation is worsened
Solution Approach 1:
The anti-rotation locking function is merged with the clamping mechanism. The locking lever and clamping band work together as an integrated system where the same components that provide clamping force also engage with the profiled structures to prevent rotation. This combination eliminates the need for separate locking mechanisms, maintaining ease of operation while providing reliable anti-rotation capability.
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 provides a secure and effective protection mechanism that prevents the guard from rotating, even if the tool bursts, thereby ensuring operator safety by maintaining a strong and stable connection between the guard and the machine neck, effectively addressing the safety concerns of existing systems.
Implementation Method 1
a clamping band (22) that may be tightened using a clamping means (24), and with an anti-rotation lock being located between the guard and the machine neck
Implementation Method 2
an anti-rotation lock being located between the guard and the machine neck that is designed as a profiled structure and acts between the machine neck and the guard
Data Source
AI summary
The invention relates to a portable power tool for a rotating, preferably disk-shaped tool (12). Said portable power tool comprises a machine housing (14), having a flange (16, 160) or a machine neck, and a protective hood (18) that can be detachably tensioned on the machine neck to cover the tool (12) or that has a protective hood neck (20) or protective hood collar that annularly carries a tightening strap (22). Said strap can be tightened by tensioning means (24). An anti-rotation lock effective between the machine neck and the protective hood (18) is interposed between the protective hood (18) and the machine neck in the form of a profiled structure (26). The invention is characterized in that the tensioning means (24), in its tensioned position, can be connected several times in a form fit to the machine neck and in its detached positioned is no longer connected in a form fit to the machine neck.