Power Tool Dust Extraction Shroud With Inward Seal and Stop-Bit Lock
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Solution Overview
Problem
Existing dust extraction systems for power tools, particularly those used in drilling and demolition, fail to effectively capture hazardous fine particulate matter like quartz dust, posing health risks to users due to inadequate suction and dust containment.
Innovation Solution
A dust extraction shroud with a body portion and engaging portion, featuring a tubular housing and a resiliently deformable top wall with a recess, is designed to securely attach to a dust extractor, ensuring efficient dust collection by preventing dust from escaping through a seal that projects radially inwardly and a mechanism to lock onto a stop bit, allowing for effective dust removal during drilling operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dust extraction shroud is used with a power tool, then dust containment is improved, but the device complexity increases due to the need for seals and locking mechanisms
Solution Approach 1:
The patent employs a flexible seal element that projects radially inwardly from the engaging portion to contact the stop bit shank. This flexible membrane-like structure creates an effective seal without requiring complex rigid sealing mechanisms, thus improving dust containment while minimizing device complexity
Solution Approach 2:
The resilient top wall with recess automatically locks onto the stop bit when the shroud is assembled. The elastic deformation and recovery of the top wall provide self-locking functionality without requiring additional locking components or complex assembly procedures, achieving secure attachment with minimal complexity
2Object-affected harmful factors
If a seal projects radially inwardly to improve dust containment, then dust leakage is reduced, but the seal may interfere with the stop bit operation
Solution Approach 1:
The seal projects radially inwardly only at specific locations where dust leakage would occur, rather than uniformly across the entire engaging portion. This localized sealing approach effectively prevents dust leakage while leaving other areas clear to avoid interfering with stop bit operation
Solution Approach 2:
The seal projects partially into the path of the stop bit shank, just enough to create an effective dust barrier. This partial projection is sufficient to prevent dust leakage without excessive interference with the normal operation of the stop bit
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 provides enhanced dust containment and efficient removal of hazardous dust particles, improving user safety by ensuring that dust is not inhaled and is effectively captured during drilling operations, aligning with stringent legislative requirements for reduced airborne dust levels.
Implementation Method 1
the top wall is resiliently deformable in order to bend in a direction perpendicular to the longitudinal axis of the engaging portion
Implementation Method 2
a seal mounted in the second inlet of the body portion, the outer edge of the seal being attached to the periphery of the second inlet, the seal projecting radially inwardly towards the longitudinal axis of the tubular body
Implementation Method 3
The shroud is connected to a source of suction which removes dust from the shroud as it is being produced
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A shroud for a dust extractor comprising a body portion and an engaging portion; wherein the body portion (2) comprises:a tubular housing (210, 214) having a first inlet formed at one end defining a first opening (204) and a second inlet formed at the other end defining a second opening (206), wherein the tubular housing forms a passageway (208) which connects the two openings (204, 206), and which comprises a longitudinal axis (202); wherein the engaging portion (13) comprises: a tubular housing which connects at one end to a side of the body portion (2) and which forms a passageway (232) which comprises a longitudinal axis (298) and which extends the length of the tubular housing of the engaging portion (13), the tubular housing, at one end, connects to a third opening (230) formed through the wall of the body portion (2) to connect the passageway (232) of the engaging portion (13) with the passageway (208) of the body portion (2) and at the other end (234), remote from the body portion (2), comprises a third inlet defining a fourth opening; wherein there is provided a seal (4) mounted in the second inlet of the body portion, the outer edge of the seal (4) being attached to the periphery of the second inlet, the seal (4) projecting radially inwardly towards the longitudinal axis (202) of the tubular body; wherein the radial length L1 the seal (4) is less that the length L2 of the tubular body (210, 214).