EP0728435A1
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EP
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Cyclone dust extractor
Assignee: Black and Decker Inc
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Filing: 1996-02-20
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Granted: —
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Expires: 2016-02-20
Abstract
Abstract A cyclone dust extractor 1 comprising a housing 3 defining a first cyclone separator 23 and a second cyclone separator 33 in series, a centrifugal fan 11 for producing cyclones within the cyclone separators 23,33 and a motor 9 for driving the fan 11, wherein at least one of the cyclone separators 23 has an inlet portion 27 and an outlet portion 31 which are separated by a wall 35. As a result, the outlet portion 31 of the first cyclone separator 23 can act as a third cyclone separator. Additionally, unwanted turbulence between the inlet flow and the outlet flow of the cyclone through the first cyclone separator 23 is avoided.
Inventors
- 👤 Philip Wren
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:54
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/10; A47L9/16; A47L9/1616; A47L9/1625; A47L9/1633; B; B04; B04C; B04C5/00; B04C5/14; B04C5/185; B04C5/187; B04C5/24; B04C5/26; B04C9/00; B04C2009/007
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
57 words
A cyclone dust extractor comprising a housing defining a first cyclone separator and a second cyclone separator in series, a fan for producing cyclones within the cyclone separators and a motor for driving the fan, wherein at least one of the cyclone separators has an inlet portion and an outlet portion which are separated by a wall.
Claim 2
Dependent Claim
24 words
A dust extractor according to claim 1, wherein the outlet portion of the at least one cyclone separator acts as a third cyclone separator.
Claim 3
Dependent Claim
33 words
A dust extractor as claimed in claim 1 or claim 2, wherein the outlet portion of the at least one cyclone separator is reverse rifled to assist in extracting dust from the cyclone.
Claim 4
Dependent Claim
44 words
A dust extractor as claimed in any preceding claim, wherein the end of the wall separating the inlet portion and the outlet portion of the at least one cyclone separator includes a diffuser for assisting in separating the inlet cyclone from the outlet cyclone.
Claim 5
Dependent Claim
55 words
A dust extractor as claimed in any preceding claim, wherein the wall between the inlet portion and the outlet portion of the at least one cyclone separator defines an inlet passageway with an outer wall and an outlet passageway with an inner wall, the cross-sectional areas of the passageways reducing on progressing along the passageways.
Claim 6
Dependent Claim
32 words
A dust extractor as claimed in any preceding claim, wherein an inner wall of the outlet portion of the first cyclone separator acts as an outer wall for the second cyclone separator.
Claim 7
Dependent Claim
29 words
A dust extractor as claimed in any preceding claim, wherein a dust collection chamber is situated between the inlet portion and the outlet portion of the first cyclone separator.
Claim 8
Dependent Claim
27 words
A dust extractor as claimed in claim 7, wherein a collar is provided in the dust collection chamber to help discharge dust particles carried by the cyclone.
Claim 9
Dependent Claim
30 words
A dust extractor as claimed in claim 7 or claim 8, wherein the dust collection chamber can be separated from the housing to discharge dust particles collected in the chamber.
Claim 10
Dependent Claim
42 words
A dust extractor as claimed in any preceding claim, wherein the second cyclone separator comprises four stages, a first stage accelerating the cyclone, a second stage decelerating the cyclone, a third stage accelerating the cyclone and a fourth stage decelerating the cyclone.
Claim 11
Dependent Claim
24 words
A dust extractor as claimed in claim 10, wherein the fourth stage of the second cyclone separator is situated within a dust collection chamber.
Claim 12
Dependent Claim
23 words
A dust extractor as claimed in any preceding claim, wherein the second cyclone separator includes a frusto-conical outlet passageway communicating with the fan.
Claim 13
Dependent Claim
25 words
A dust extractor as claimed in any preceding claim, wherein the housing is provided with a tangential inlet port communicating with the first cyclone separator.
Claim 14
Dependent Claim
13 words
A cyclone dust extractor as claimed in any preceding claim, which is portable.
Claim 15
Dependent Claim
20 words
A dust extractor as claimed in claim 14, wherein a belt clip is provided on the outside of the housing.
Claim 16
Dependent Claim
19 words
A dust extractor as claimed in any preceding claim, which is powered by a battery carried in the housing.
Claim 17
Dependent Claim
18 words
A cyclone dust extractor substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
References Cited (Backward Citations)
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