Power Tool Dust Screen Attachment for Metal Chip Protection
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Solution Overview
Problem
Handheld power tools, such as angle grinders, face the issue of metal chips and particles entering the interior, leading to potential short-circuits and electrical shock due to the conductive nature of these particles, and existing dust protection mechanisms are not securely attached, risking detachment during use.
Innovation Solution
A dust protection element is securely attached to the power tool housing by being pushed onto it in an insertion direction, utilizing a receiving section and coupling section with an undercut, and a latching connection, which fixes the axial position and prevents contaminants from entering, while a screen structure with a specific mesh width controls particle entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dust protection element is clipped onto the power tool housing from below, then the interior is protected against contaminants, but the dust protection element must be partially bent and may become loose during use
Solution Approach 1:
Instead of clipping the dust protection element from below as in prior art, the invention inverts the attachment direction by pushing the element onto the housing from the air inlet side. This inversion eliminates the need for bending and provides secure attachment through friction and geometric locking features.
Solution Approach 2:
The dust protection element is divided into functional segments: a friction section for initial attachment, geometric locking features for securing, and a screen structure for filtration. This segmentation allows each part to perform its specific function optimally while simplifying the overall assembly process.
2Ease of operation
If the dust protection element is pushed onto the housing in the insertion direction, then the attachment is easier and no deformation is needed, but additional securing mechanisms are required to prevent detachment
Solution Approach 1:
The dust protection element utilizes the housing's own geometric features (ridges and grooves) as locking mechanisms. The element's shape complements these features to create automatic geometric locking upon insertion, eliminating the need for separate securing components while maintaining simplicity.
Solution Approach 2:
The dust protection element incorporates curved or angled surfaces that mate with corresponding features on the housing. These geometric shapes create friction-based retention and mechanical locking through their complementary curvature, providing secure attachment without additional mechanisms.
3Reliability
If the dust protection element is secured by the second housing part on the first housing part, then the axial position is fixed and disengagement is prevented, but the housing design becomes more complex
Solution Approach 1:
The invention combines the dust protection element with the housing structure by integrating it between the first and second housing parts. The element is pushed onto the first housing part and then secured when the second housing part is assembled, merging three components into a single integrated assembly that prevents disengagement.
Solution Approach 2:
The dust protection element is nested within the housing structure, specifically positioned between the first and second housing parts. This nesting arrangement allows the element to be secured by the overlapping housing parts, creating a layered configuration that fixes the axial position and prevents removal.
Data Source
AI summary
A handheld power tool having a drive driving a motor shaft, which is accommodated in a power tool housing, in which at least one air inlet covered by a dust protection element is formed, and having a tool interface for connecting a tool. The dust protection element is pushed onto the power tool housing in an insertion direction and is secured on the power tool housing.