Hand-Held Power Tool Dust Purging With Pressurized Air
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Solution Overview
Problem
Hand-held power tools produce workpiece particles such as dust and chips during machining, which contaminate the working area and environment, impair tool functionality, and pose safety risks due to residual particles being cut by the tool, leading to increased wear and potential injury.
Innovation Solution
A hand-held power tool equipped with a pressurized fluid dispensing assembly that purges the working area with gaseous pressurized fluid to remove particles, combined with a vacuum assembly to further extract particles, ensuring effective particle removal and preventing tool malfunction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vacuum assembly is used to extract workpiece particles, then workpiece particles in the working area are captured, but particles remain in areas not captured by the suction flow, particularly in the cavity
Solution Approach 1:
The particle removal system is segmented into two distinct functional components: a vacuum assembly for extracting particles from the working area, and a pressurized fluid dispensing assembly for purging particles from the cavity. This segmentation allows each component to target specific zones, with the vacuum handling the working area and the pressurized fluid handling the cavity, thereby achieving complete particle removal without leaving residual particles that could cause tool malfunction or injury
Solution Approach 2:
Pressurized fluid is introduced as an intermediary substance to actively push workpiece particles out of the cavity toward the vacuum assembly's suction opening. This intermediary mechanism bridges the gap between the cavity (where particles accumulate) and the vacuum extraction zone, ensuring particles are transported from areas the vacuum cannot directly reach to areas where they can be effectively captured
2Object-affected harmful factors
If vacuum assembly with limited depth of action is used, then particles in reachable areas are captured, but particles in the cavity are not removed, leading to tool malfunction and safety risks
Solution Approach 1:
The system merges two previously separate particle removal approaches into a single integrated solution: the vacuum assembly and the pressurized fluid dispensing assembly work together as a unified particle removal system. The vacuum provides extraction capability while the pressurized fluid provides active particle transport, and their combined operation achieves comprehensive particle removal from both the working area and the cavity, eliminating the limitations of using either system alone
3Productivity
If workpiece particles remain in the cavity, then the tool movement is inhibited and machining time is extended, but adding more extraction mechanisms increases device complexity
Solution Approach 1:
The pressurized fluid dispensing assembly serves multiple functions within the particle removal system: it actively transports particles from the cavity, enhances the vacuum assembly's extraction efficiency, and prevents particle accumulation that would inhibit tool movement. This multi-functional approach allows the system to achieve comprehensive particle removal and maintain high productivity without requiring multiple separate complex extraction mechanisms, as the pressurized fluid system performs both particle transport and prevention functions
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 solution effectively removes workpiece particles from the working area, enhancing tool functionality, reducing wear, and minimizing safety hazards, while also supporting efficient machining by preventing residual particles from interfering with the tool's operation.
Implementation Method 1
a pressurized fluid dispensing assembly (25) having an outlet area (29) for dispensing gaseous pressurized fluid into a working area of the tool during machining of the workpiece with the tool to purge the working area with the gaseous pressurized fluid
Implementation Method 2
Vacuum assemblies, which are intended to extract the workpiece particles produced during machining
Data Source
AI summary
A hand-held power tool, in particular woodworking tool, including a housing, a handle for positioning the power tool relative to a workpiece, a reciprocating unit for holding a tool for machining a workpiece, a drive module located in the housing for driving the reciprocating unit, and a pressurized fluid dispensing assembly having an outlet area for dispensing gaseous pressurized fluid into a working area of the tool during machining of the workpiece with the tool to purge the working area to cause and/or assist a conveyance of workpiece particles from the formed depression.