Patent US4023233A successfully refreshed from Google Patents.
US4023233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface cleaning device
Assignee: WARWICK PUMP AND ENGR CO Ltd
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Filing: 1975-08-12
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Granted: 1977-05-17
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Expires: 1995-08-12
Abstract
Abstract A surface cleaning device comprising nozzle means for directing a high-pressure jet of liquid at an acute angle on to a surface, and collection means for collecting the liquid after deflection from the surface, said collection means including an inlet duct of approximately constant cross-sectional area having a lower wall terminating with an edge adapted in use to contact the surface ahead of the area of impingement of the jet, whereby in use the liquid jet deflected from the surface co-operates with the duct to create a jet-pump which sucks entrained air, stray liquid, and debris cleaned from the surface, into the duct.
Inventors
- 👤 John Richard Prestwich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:14
CPC Classifications
A; A47; A47L; A47L11/00; A47L11/40; A47L11/408; A47L11/4088; A47L11/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
103 words
A surface cleaning device comprising nozzle means for directing a high-pressure jet of liquid at an acute angle on to a surface, and collection means for collecting the liquid after deflection from the surface, said collection means including an inlet duct of approximately constant cross-sectional area having a lower wall terminating with an edge adapted in use to contact the surface ahead of the area of impingement of the jet, whereby in use the liquid jet deflected from the surface co-operates with the duct to create a jet-pump which sucks entrained air, stray liquid, and debris cleaned from the surface, into the duct.
Claim 2
Dependent Claim
103 words
A surface cleaning device comprising nozzle means for directing a high-pressure jet of liquid at an acute angle on to a surface, and collection means for collecting the liquid after deflection from the surface, said collection means including an inlet duct of approximately constant cross-sectional area having a lower wall terminating with an edge adapted in use to contact the surface ahead of the area of impingement of the jet, whereby in use the liquid jet deflected from the surface co-operates with the duct to create a jet-pump which sucks entrained air, stray liquid, and debris cleaned from the surface, into the duct.
Claim 3
Dependent Claim
34 words
A device as claimed in claim 1 wherein said nozzle means is formed such as to emit a substantially planar fanned jet, the inlet duct having in cross-section the form of an elongate slot.
Claim 4
Dependent Claim
40 words
A device as claimed in claim 2 wherein an upper wall of the inlet duct is adapted to co-operate in use with the surface to form a mouth for the duct maintaining the approximately constant cross-sectional area of the duct.
Claim 5
Dependent Claim
48 words
A device as claimed in claim 3 wherein the collection means includes a cylindrical liquid recovery chamber, extending parallel to said tube, for receiving liquid from the duct, said nozzles being inclined towards an outlet in said chamber to produce a helical flow of liquid towards said outlet.
Claim 6
Dependent Claim
27 words
A device as claimed in claim 1 wherein said nozzle means comprises a plurality of nozzles mounted on a tube which supplies high-pressure liquid to each nozzle.
Claim 7
Dependent Claim
26 words
A device as claimed in claim 1 further comprising a sump for receiving spent liquid from the duct, and means for extracting liquid from said sump.
Claim 8
Dependent Claim
25 words
A device as claimed in claim 6 wherein a perforated basket is removably disposed in the sump for collecting particles of debris from the liquid.
Claim 9
Dependent Claim
39 words
A device as claimed in claim 6 wherein comprising a suction fan is disposed in a roof of the sump for removing air from the sump as the air, liquid and debris issue from the duct into the sump.
Claim 10
Dependent Claim
25 words
A device as claimed in claim 6 wherein means is provided for filtering and recirculating liquid extracted from the sump to supply the nozzle means.
Claim 11
Dependent Claim
18 words
A device as claimed in claim 1 and having wheels for movement along the surface to be treated.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |