Braking Device for Angle Grinder Using Tilted Counter-Brake Disc
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric hand-held power tools, such as angle grinders, face challenges in implementing a braking device that is narrow, inexpensive, and mechanically simple, as existing solutions are complex and costly.
Innovation Solution
The braking device is designed with a fixed brake disk on the drive shaft and a spring-biased counter-brake disk that is tilted to disengage the braking surfaces, utilizing a planar actuating element that pivots to release or lock the braking mechanism, allowing for a compact and cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional braking device is used in electric hand-held power tools, then the braking function is provided, but the device becomes complex and costly
Solution Approach 1:
The braking device is divided into two independent components: a fixed brake disc and a movable counter-brake disc. This segmentation allows each component to perform its specific function independently, simplifying the overall structure while maintaining reliable braking capability through the interaction of these segmented parts
Solution Approach 2:
Instead of using a complex multi-component braking system, the invention inverts the approach by using a simple spring-biased counter-brake disc that engages with a fixed brake disc. The counter-brake disc is biased by a spring towards the brake disc, creating a simple yet effective braking mechanism that reduces structural complexity
2Reliability
If a traditional braking device is used in electric hand-held power tools, then the braking function is provided, but the construction becomes narrow and expensive
Solution Approach 1:
The counter-brake disc is designed to combine multiple functions in a single component: it serves as both the braking element and the actuating mechanism. The spring biasing mechanism is integrated directly into the counter-brake disc assembly, merging the braking function and the actuation function into one unified component that is easier and cheaper to manufacture
Solution Approach 2:
The actuating element operates by tilting or pivoting in a different dimensional plane rather than moving linearly. This dimensional change allows for a more compact arrangement of components and simplifies the actuation mechanism, reducing both the construction space required and manufacturing complexity
3Ease of operation
If a planar actuating element is used to tilt the counter-brake disc, then the braking surfaces disengage, but the mechanism requires precise control
Solution Approach 1:
The counter-brake disc is designed to be tiltable or pivotable relative to the fixed brake disc, creating a dynamic braking mechanism. This dynamic design allows the counter-brake disc to move between engaged and disengaged positions through simple tilting motion, making the brake easy to operate while the spring provides automatic return to the engaged position
Solution Approach 2:
The spring-biased counter-brake disc automatically returns to its engaged position with the brake disc without requiring active control. The spring provides self-service by automatically re-engaging the braking surfaces after the actuating element is released, eliminating the need for precise control mechanisms to maintain the engaged state
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
This design achieves a narrow and efficient braking mechanism that can be easily integrated into the tool, providing effective braking with minimal components and allowing for optional module installation between housing parts, enhancing manufacturing flexibility.
Implementation Method 1
a non-rotating counter-brake disc which is spring-biased in the direction of the brake disc
Implementation Method 2
a non-rotating counter-brake disc which is spring-biased in the direction of the brake disc
Implementation Method 3
the above-mentioned areal actuating member moves the counter-brake disc in the release direction or in the locking direction merely by slightly tilting with respect to its plane
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The electrical hand tool unit, particularly angle grinder or cut-off grinder, has a drive housing (10), a motor housing part (6) and handle part. A counter-brake disc (26) is moved in release direction from a laminar actuating mechanism (36) extending in a level parallel to the level of the counter-brake disc against the spring pre-tensioning and the laminar actuating mechanism is tilted relative to the earlier level around a certain level.