Patent US4219902A successfully refreshed from Google Patents.
US4219902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum cleaning
Assignee: Techtronic Floor Care Technology Ltd
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Filing: 1979-02-09
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Granted: 1980-09-02
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Expires: 1999-02-09
Abstract
Abstract A brush assembly is fixedly mounted to each side wall of a vacuum cleaner head closely adjacent the axis of a rotary brush. The brush bristles of each assembly are directed so as to brushingly engage the wall-floor corner. The brushes are aligned in the direction of longitudinal movement of the vacuum cleaner. A guide slot is formed in the head adjacent the end of each brush assembly, with each slot providing communication between the outside of the head and the vacuum chamber containing the rotary brush. Dirt and debris loosened by the brush assemblies is sucked through the channels formed by the slots and the floor, and then into the path of the rotary brush and into the vacuum chamber.
Inventors
- 👤 Donald R. DeMaagd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:27
CPC Classifications
A; A47; A47L; A47L9/00; A47L9/02; A47L9/04; A47L9/06; A47L9/0606; A47L9/062
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
217 words
For use in a vacuum type floor cleaner having means to provide a suction flow of air, a lower head unit comprising: (a) a housing having front and rear walls joined by side walls, (b) means on said housing forming a vacuum inlet chamber, (c) a transversely extending rotary brush disposed in said chamber, (d) means to drive said rotary brush so that dirt and similar material on the floor are loosened thereby and sucked into said chamber by the flowing air, (e) downwardly inclined stationary brush means fixedly attached on each side of said housing and extending transversely outwardly therefrom for engagement with the floor for loosening said material as said floor cleaner is translated over the floor so that said latter loosened material is sucked into said chamber, (f) and a transverse slot disposed in said housing adjacent each said brush means and communicating between the outside of said housing and said chamber so that material loosened by said brush means is drawn by the air flow through the slot and into said chamber, (g) each said transverse slot being disposed forwardly of its respective brush means and communicates with the forward part of said chamber adjacent said rotary brush so that material drawn through said slot is brought into engagement with said rotary brush.
Claim 2
Dependent Claim
217 words
For use in a vacuum type floor cleaner having means to provide a suction flow of air, a lower head unit comprising: (a) a housing having front and rear walls joined by side walls, (b) means on said housing forming a vacuum inlet chamber, (c) a transversely extending rotary brush disposed in said chamber, (d) means to drive said rotary brush so that dirt and similar material on the floor are loosened thereby and sucked into said chamber by the flowing air, (e) downwardly inclined stationary brush means fixedly attached on each side of said housing and extending transversely outwardly therefrom for engagement with the floor for loosening said material as said floor cleaner is translated over the floor so that said latter loosened material is sucked into said chamber, (f) and a transverse slot disposed in said housing adjacent each said brush means and communicating between the outside of said housing and said chamber so that material loosened by said brush means is drawn by the air flow through the slot and into said chamber, (g) each said transverse slot being disposed forwardly of its respective brush means and communicates with the forward part of said chamber adjacent said rotary brush so that material drawn through said slot is brought into engagement with said rotary brush.
Claim 3
Dependent Claim
41 words
The head unit of claim 1 wherein said brush means are disposed adjacent the ends of said rotary brush and comprise a plurality of stationary brush bristles formed in a line which is parallel to the longitudinal direction of cleaner translation.
Claim 4
Dependent Claim
35 words
The head unit of claims 1 or 2 wherein each said slot comprises spaced transversely extending edges and a top wall which, together with the floor, form a restricted guide channel for air flow therethrough.
Claim 5
Dependent Claim
23 words
The head unit of claim 3 wherein the said top wall of said slot is inclined downwardly and inwardly toward said rotary brush.
References Cited (Backward Citations)
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Cited
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US1560400A
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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) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |