Power Tool Dust Extraction via Shaft-Mounted Impeller
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Solution Overview
Problem
Hand-held power tools generate substantial dust during operation, which interferes with cutting and requires cumbersome external vacuum systems or bulky integral vacuum systems, necessitating a more efficient and portable dust removal solution.
Innovation Solution
A dust extraction system integrated with the power tool, featuring a base with a cavity and discharge chute, an impeller with a collet nut for direct mounting to the output shaft, and a baffle for enhanced debris collection, allowing for independent operation without external vacuum systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If an external vacuum system is used to remove dust, then dust extraction capability is improved, but device complexity and ease of operation deteriorate due to requiring separate equipment and connections
Solution Approach 1:
The patent combines the vacuum system with the power tool by integrating an impeller directly onto the motor output shaft. This merging of functions allows the tool to extract its own dust without requiring external vacuum equipment, thereby improving dust extraction capability while reducing overall system complexity
Solution Approach 2:
The power tool becomes self-sufficient by incorporating a dust extraction system that operates independently without external assistance. The impeller, driven by the tool's own motor, creates negative pressure to extract dust generated during operation, eliminating the need for separate vacuum systems
2Object-generated harmful factors
If an integral vacuum system is built into the power tool, then dust extraction capability is improved, but weight and size increase
Solution Approach 1:
The motor serves dual functions: driving the cutting tool bit and powering the impeller for dust extraction. This multi-functionality eliminates the need for a separate vacuum motor, significantly reducing weight while maintaining effective dust extraction capability
Solution Approach 2:
The impeller is integrated directly onto the motor output shaft, combining the drive mechanism for both the tool bit and the dust extraction system. This integration eliminates additional components and reduces overall weight compared to separate vacuum systems
3Ease of operation
If a detachable dust removal system is used, then ease of operation is improved, but reliability may deteriorate due to connection issues
Solution Approach 1:
The dust extraction system is designed as a detachable component that can be easily mounted to or removed from the power tool housing. This segmentation allows users to attach the system when dust extraction is needed and remove it when not required, improving ease of operation while maintaining reliable connections through proper mounting interfaces
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 system effectively extracts dust and debris, maintaining tool maneuverability and usability, with minimal weight and profile, and can be easily mounted or removed, eliminating the need for external vacuum systems.
Implementation Method 1
an impeller sized and configured to be rotatably received within the cavity, including a hub and a plurality of vanes emanating from the hub configured to draw the dust and debris from the workpiece into the cavity
Data Source
AI summary
A dust extraction system for a power tool having a output shaft, a collet configured for engaging a tool bit and a collet nut engageable to the output shaft, comprises a base configured for mounting on the power tool, the base defining a cavity having an opening for passage of the output shaft therethrough and a discharge chute in communication with the cavity. The system further includes an impeller sized and configured to be rotatably received within the cavity, including a hub and a plurality of vanes emanating from the hub configured to draw dust from the workpiece into the cavity and to direct the dust through the discharge chute. A collet nut is integrated into the hub of the impeller so that the impeller can be directly mounted to the output shaft of the power tool while clamping the collet onto the tool bit.