Angle Grinder Support Arm Cover for High-Load Rigidity
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Solution Overview
Problem
Hand-held cut-off grinders with compact and delicate support arms face challenges in withstanding high forces during operation, leading to potential damage and reduced stability and rigidity.
Innovation Solution
The support arm is reinforced with a metal arm cover that diverts forces from the support arm, using fastening elements strategically positioned above the axis of rotation to reduce load on the support arm and maintain stability while minimizing the reduction in cutting depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the support arm is made compact and delicate to achieve increased cutting depths, then the cutting depth is improved, but the stability and rigidity of the support arm deteriorates
Solution Approach 1:
The support arm is divided into functional segments: a compact second end for achieving cutting depth and a reinforced first end with metal arm cover for withstanding forces. This segmentation allows each part to be optimized for its specific function without compromising the other.
Solution Approach 2:
The support arm combines different materials: a compact structure at the second end and a metal material (aluminum or magnesium alloy) for the arm cover at the first end. This composite approach allows the support arm to achieve both compactness for cutting depth and sufficient strength for withstanding forces.
2Length of moving object
If the support arm is made compact and delicate to achieve increased cutting depths, then the cutting depth is improved, but the load-bearing capacity of the support arm deteriorates
Solution Approach 1:
The support arm is divided into functional segments: a compact second end for achieving cutting depth and a reinforced first end with metal arm cover for withstanding forces. This segmentation allows each part to be optimized for its specific function without compromising the other.
Solution Approach 2:
The metal arm cover is applied locally at the first end of the support arm where forces are generated, rather than throughout the entire support arm. This local reinforcement provides the necessary load-bearing capacity at the critical location while maintaining the compact and delicate design at the second end for achieving cutting depth.
3Strength
If the arm cover is made of metal material to withstand high forces, then the strength and rigidity are improved, but the weight of the arm cover increases
Solution Approach 1:
The support arm combines different materials: a compact structure at the second end and a metal material (aluminum or magnesium alloy) for the arm cover at the first end. This composite approach allows the support arm to achieve both compactness for cutting depth and sufficient strength for withstanding forces.
Solution Approach 2:
The metal arm cover is applied locally at the first end of the support arm where forces are generated, rather than throughout the entire support arm. This local reinforcement provides the necessary load-bearing capacity at the critical location while maintaining the compact and delicate design at the second end for achieving cutting depth.
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 metal arm cover effectively transmits high forces without damage, enhancing the support arm's stability and rigidity while maintaining a compact design, thus preventing damage and ensuring efficient operation under high forces.
Implementation Method 1
An arm cover made of a metal material has the advantage over conventional plastic arm covers that, due to the higher modulus of elasticity, forces generated can be transmitted by the arm cover without damaging the arm cover.
Data Source
Figure 1A~1B
Figure 2~3
AI summary
Hand-held angle grinder comprising a cutting disc, a motor housing with a drive unit and a boom with a support arm and an arm cover, which is attached to the support arm via several fastening elements.