Patent CH396048A successfully refreshed from Google Patents.
Patent US5893936A successfully refreshed from Google Patents.
US5893936A
Expired / Lapsed
US
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Shroud and cyclonic cleaning apparatus incorporating same
Assignee: Dyson Technology Ltd
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Filing: 1995-12-27
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Granted: 1999-04-13
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Expires: 2015-12-27
Abstract
Abstract The invention provides a shroud (10; 40) for use in apparatus incorporating a cyclonic dust separation divice for separating dirt and dust from an airflow, the shroud (10; 40) having a perforated portion (14; 44) having a multiplicity of perforations (30; 46) for allowing the airflow to pass therethrough. According to the invention, the upstream edge of each perforation (30) meets the upstream surface (28) of the shroud (10) at a sharply defined angle. The invention improves the performance of the dust separation apparatus in conjunction with which the shroud (10; 40) is utilized.
Inventors
- 👤 James Dyson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:23
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/08; B04C5/10; A; A47; A47L; A47L9/00; A47L9/10; A47L9/16; A47L9/1616; A47L9/1625; A47L9/1633; B04C11/00; B04C5/24; B04C5/26; Y; Y10; Y10S; Y10S55/00; Y10S55/03
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
69 words
A shroud for use in apparatus incorporating cyclonic dust separating means for separating dirt and dust from an airflow, the shroud having an upstream surface and comprising a perforated portion having a multiplicity of perforations for allowing the airflow to pass therethrough perpendicular to a longitudinal axis of the shroud, wherein an upstream edge of each perforation meets the upstream surface of the shroud to form a sharp edge.
Claim 2
Dependent Claim
69 words
A shroud for use in apparatus incorporating cyclonic dust separating means for separating dirt and dust from an airflow, the shroud having an upstream surface and comprising a perforated portion having a multiplicity of perforations for allowing the airflow to pass therethrough perpendicular to a longitudinal axis of the shroud, wherein an upstream edge of each perforation meets the upstream surface of the shroud to form a sharp edge.
Claim 3
Dependent Claim
76 words
A shroud for use in apparatus incorporating cyclonic dust separating means for separating dirt and dust from an airflow, the shroud having an upstream surface and comprising a perforated portion having a multiplicity of perforations for allowing the airflow to pass therethrough, wherein an upstream edge of each perforation meets the upstream surface of the shroud to form a sharp edge and wherein an angle between the upstream surface and the upstream edge is substantially 90°.
Claim 4
Dependent Claim
76 words
A shroud for use in apparatus incorporating cyclonic dust separating means for separating dirt and dust from an airflow, the shroud having an upstream surface and comprising a perforated portion having a multiplicity of perforations for allowing the airflow to pass therethrough, wherein an upstream edge of each perforation meets the upstream surface of the shroud to form a sharp edge and wherein an angle between the upstream surface and the upstream edge is substantially 90°.
Claim 5
Dependent Claim
22 words
A shroud as claimed in claim 1 or 2, wherein each perforation is cylindrical and has a diameter of substantially 2.2 mm.
Claim 6
Dependent Claim
30 words
A shroud as claimed in any one of claims 1 or 2 wherein a thickness of the perforated portion in a longitudinal direction of the perforations is substantially 2 mm.
Claim 7
Dependent Claim
18 words
A shroud as claimed in any one of claims 1 or 2 wherein the perforated portion is cylindrical.
Claim 8
Dependent Claim
28 words
A shroud as claimed in any one of claims 1 or 2 wherein the shroud further comprises a lip depending from a lower edge of the perforated portion.
Claim 9
Dependent Claim
19 words
A shroud as claimed in claim 6, wherein the lip comprises a parallel-sided portion having an inclined distal end.
Claim 10
Dependent Claim
26 words
A shroud as claimed in claim 7, wherein the distal end is inclined at an angle of substantially 45° to the parallel sides of the lip.
Claim 11
Dependent Claim
24 words
A shroud as claimed in claim 7 wherein the parallel sides of the lip extend substantially parallel to the longitudinal axis of the shroud.
Claim 12
Dependent Claim
25 words
A shroud as claimed in claim 7 wherein the lip extends between 10 mm and 20 mm below the lower edge of the perforated portion.
Claim 13
Dependent Claim
22 words
A shroud as claimed in claim 10, wherein the lip extends substantially 15 mm below the lower edge of the perforated portion.
Claim 14
Dependent Claim
23 words
A shroud as claimed in claim 7 wherein the lip is broader in cross-section at its proximal end than at its distal end.
Claim 15
Dependent Claim
25 words
A shroud as claimed in claim 12, wherein the lip comprises a step formed radially inwardly of the parallel-sided portion at the proximal end thereof.
Claim 16
Dependent Claim
23 words
A shroud as claimed in claim 13 wherein a breadth of the step is substantially equal to a breadth of the parallel-sided portion.
Claim 17
Dependent Claim
20 words
A shroud as claimed in claim 13 wherein a height of the step is substantially equal to a breadth thereof.
Claim 18
Dependent Claim
37 words
Apparatus as claimed in claim 1 wherein the cyclonic dust separation means comprise a low efficiency cyclone and a high efficiency cyclone positioned downstream of the low efficiency cyclone, the shroud being positioned between the two cyclones.
Claim 19
Dependent Claim
14 words
Apparatus as claimed in claim 16 wherein the apparatus consists of a vacuum cleaner.
Claim 20
Dependent Claim
25 words
A shroud as claimed in claim 9 wherein the lip extends between 10 mm and 20 mm below the lower edge of the perforated portion.
Claim 21
Dependent Claim
22 words
A shroud as claimed in claim 18 wherein the lip extends substantially 15 mm below the lower edge of the perforated portion.
Claim 22
Dependent Claim
23 words
A shroud as claimed in claim 9 wherein the lip is broader in cross-section at its proximal end than at its distal end.
Claim 23
Dependent Claim
23 words
A shroud as claimed in claim 10 wherein the lip is broader in cross-section at its proximal end than it its distal end.
Claim 24
Dependent Claim
25 words
A shroud as claimed in claim 20 wherein the lip comprises a step formed radially inwardly of the parallel-sided portion at the proximal end thereof.
Claim 25
Dependent Claim
25 words
A shroud as claimed in claim 21 wherein the lip comprises a step formed radially inwardly of the parallel-sided portion at the proximal end thereof.
Claim 26
Dependent Claim
23 words
A shroud as claimed in claim 22 wherein a breadth of the step is substantially equal to a breadth of the parallel-sided portion.
Claim 27
Dependent Claim
23 words
A shroud as claimed in claim 23 wherein a breadth of the step is substantially equal to a breadth of the parallel-sided portion.
Claim 28
Dependent Claim
20 words
A shroud as claimed in claim 14 wherein a height of the step is substantially equal to the breadth thereof.
Claim 29
Dependent Claim
20 words
A shroud as claimed in claim 22 wherein a height of the step is substantially equal to a breadth thereof.
Claim 30
Dependent Claim
20 words
A shroud as claimed in claim 23 wherein a height of the step is substantially equal to a breadth thereof.
Claim 31
Dependent Claim
20 words
A shroud as claimed in claim 24 wherein a height of the step is substantially equal to the breadth thereof.
Claim 32
Dependent Claim
20 words
A shroud as claimed in claim 25 wherein a height of the step is substantially equal to the breadth thereof.
Claim 33
Dependent Claim
24 words
A shroud as claimed in claim 8 wherein the parallel sides of the lip extend substantially parallel to the longitudinal axis of the shroud.
Claim 34
Dependent Claim
25 words
A shroud as claimed in claim 8 wherein the lip extends between 10 mm and 20 mm below the lower edge of the perforated portion.
Claim 35
Dependent Claim
23 words
A shroud as claimed in claim 8 wherein the lip is broader in cross-section at its proximal end than at its distal end.
Claim 36
Dependent Claim
23 words
A shroud as claimed in claim 32 wherein the lip is broader in cross-section at its proximal end than at its distal end.
Claim 37
Dependent Claim
23 words
A shroud as claimed in claim 18 wherein the lip is broader in cross-section at its proximal end than at its distal end.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-04-12 | 2002-10-12 | 2003-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-04-12 | 2006-10-12 | 2007-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-04-12 | 2010-10-12 | 2011-04-13 | $7700.00 | Window Closed / Lapsed |