Self-Centering Dust Collection Container Guide Mechanism
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Solution Overview
Problem
The attachment of a dust collection container to the housing of a suction device in hand tools, such as hammer drills, is often difficult due to jamming caused by dirt and dust accumulation, especially in dirty and dusty environments, leading to alignment issues and increased pressure requirements.
Innovation Solution
The implementation of guide means with smooth surface sections for initial alignment and dust-receiving cavities to prevent jamming, where the guide means include planar and surface-smooth guideway sections for self-centering and telescoping engagement, with dust-receiving cavities opening after initial alignment to capture dirt, reducing snagging and tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If guide means are used to align the dust collection container with the housing body, then alignment precision is improved, but dirt and dust accumulation between the guide means causes jamming and increases the difficulty of attachment
Solution Approach 1:
The guide means is divided into two functional sections: first guideway sections with smooth surfaces for initial alignment and self-centering, and second guideway sections with open-surface dust-receiving cavities for capturing dirt. This segmentation allows each section to perform its specific function without interference from dirt accumulation in the alignment-critical first section.
Solution Approach 2:
The dust-receiving cavities act as intermediary structures that capture and contain dirt and dust particles between the guide means. By providing these intermediate receptacles, the dirt is diverted away from the critical sliding surfaces, preventing jamming while maintaining alignment functionality.
2Manufacturing precision
If the guide means work together with less play to improve alignment, then alignment precision is improved, but the risk of jamming due to dirt and dust increases
Solution Approach 1:
The guide means is divided into two functional sections: first guideway sections with smooth surfaces for initial alignment and self-centering, and second guideway sections with open-surface dust-receiving cavities for capturing dirt. This segmentation allows each section to perform its specific function without interference from dirt accumulation in the alignment-critical first section.
Solution Approach 2:
The dust-receiving cavities convert the harmful effect of dirt and dust accumulation into a beneficial function by providing designated receptacles for these particles. The dirt that would otherwise cause jamming is now captured and contained, allowing the guide means to maintain tight tolerances for precise alignment without suffering from reliability issues.
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to an extraction device (2) for a motor-driven hand tool, in particular for a rotary hammer, with a housing body (4) and with fastening means for releasably fixing the housing body (4) of the extraction device to the hand tool, wherein the extraction device comprises a dust discharge device (10) communicating with a tool contact point (12) and a dust collection device (19), wherein the dust collection device (19) comprises a dust collection container (20) containing filter means (24) that can be detached from the housing body (4), into which the dust discharge device (10) opens and which can be acted upon by a device generating negative pressure;and that the dust collection container (20) can be slid onto the housing body (4) in a joining direction (26) and can be brought into its intended mounting position on the housing body (4) in a self-centering manner, and that for this purpose, cooperating guide means (28, 30) are provided on the housing body (4) and on the dust collection container (20), that the guide means (28, 30) have, at the beginning of the sliding process, cooperating planar and surface-smooth first guide track sections (38, 40) extending substantially in the joining direction (26), and that at least one of the guide means (28, 30) subsequently has a second guide track section (44, 46) with surface-open dust collection cavities (48, 50).