Patent US3909875A successfully refreshed from Google Patents.
US3909875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaner construction
Assignee: Vorwerk and Co Elektrowerke GmbH and Co KG
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Filing: 1973-10-03
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Granted: 1975-10-07
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Expires: 1993-10-03
Abstract
Abstract A nozzle unit for a vacuum cleaner has a housing provided with an opening, and a brush disc is located in the housing and has bristles extending outwardly through the opening. A mounting arrangement mounts the disc so that it rotates about an axis which extends substantially normal to the plane of the opening, permitting the disc to be displaced inwardly of the opening along its axis of rotation. A biasing spring yieldably resists such inward displacement, and a sealing arrangement seals the mounting arrangement and the biasing spring with reference to the ambient atmosphere.
Inventors
- 👤 Eberhard Rother
- 👤 Miroslav Beranek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:32
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/02; A47L9/04; A47L9/0405; A47L9/0416; A47L9/0461; A47L9/0466; A47L9/0472
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
138 words
In a vacuum cleaner, a nozzle unit comprising a housing having an inlet opening for particle-carrying air, and an outlet communicating with the suction source of the vacuum cleaner; a brush disc located in said housing and having bristles extending outwardly through said opening, and a plurality of circumferentially spaced inclined vanes extending radially of the disc periphery and arranged to be impinged by air flowing from said inlet opening to said outlet so that such air drives said disc in rotation; mounting means mounting said disc for rotation about an axis which extends substantially normal to the plane of said opening, and for displacement inwardly of said opening along said axis; biasing means yieldably resisting said displacement; and sealing means sealing said mounting means and biasing means against contact with the particle-carrying air flowing through said housing.
Claim 2
Dependent Claim
138 words
In a vacuum cleaner, a nozzle unit comprising a housing having an inlet opening for particle-carrying air, and an outlet communicating with the suction source of the vacuum cleaner; a brush disc located in said housing and having bristles extending outwardly through said opening, and a plurality of circumferentially spaced inclined vanes extending radially of the disc periphery and arranged to be impinged by air flowing from said inlet opening to said outlet so that such air drives said disc in rotation; mounting means mounting said disc for rotation about an axis which extends substantially normal to the plane of said opening, and for displacement inwardly of said opening along said axis; biasing means yieldably resisting said displacement; and sealing means sealing said mounting means and biasing means against contact with the particle-carrying air flowing through said housing.
Claim 3
Dependent Claim
36 words
A nozzle unit as defined in claim 1, said disc having a side facing said opening and provided with a plurality of tufts of said bristles arranged in straight rows which extend outwardly from said axis.
Claim 4
Dependent Claim
36 words
A nozzle unit as defined in claim 2, wherein said bristles of said tufts of bristles in each of said row have a length which increases with increasing proximity of the respective tuft towards said axis.
Claim 5
Dependent Claim
42 words
A nozzle unit as defined in claim 2, said sealing means including an annular collar on an other side of said disc opposite to said one side, and said mounting means including a sliDe bearing located within the confines of said collar.
Claim 6
Dependent Claim
21 words
A nozzle unit as defined in claim 4, wherein said slide bearing comprises a metallic sleeve extending longitudinally of said axis.
Claim 7
Dependent Claim
56 words
A nozzle unit as defined in claim 4, said collar having an open end facing inwardly of said housing and being provided with a circumferentially extending step; and said sealing means further comprising an annular portion provided on said housing axially adjacent said open end and having an edge portion which partly extends into said step.
Claim 8
Dependent Claim
52 words
A nozzle unit as defined in claim 1, said mounting means including a portion of said housing extending towards said opening, and wherein said sealing means comprises an extension of said portion, said extension being cupped in direction towards said disc and said disc having a tubular part telescoped over said extension.
Claim 9
Dependent Claim
100 words
A nozzle as defined in claim 1, said mounting means comprising a tubular guide mounted in said housing and having an open end facing said opening, a journal pin slidably received in said guide and having a free end portion extending from said open end, said biasing means urging said pin outwardly of said guide, a bearing ball intermediate and in engagement with an inwardly directed surface of said disc and an axial end face of said end portion, and means mounting said disc on said tubular guide slidable axially of the same against the action of said biasing means.
References Cited (Backward Citations)
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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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |