Patent US4817233A successfully refreshed from Google Patents.
US4817233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scrubber squeegees for scrubbing forward and backward
Assignee: Tennant Co
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Filing: 1988-04-22
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Granted: 1989-04-04
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Expires: 2008-04-22
Abstract
Abstract This is an improvement for a powered floor scrubber which in use is moved forward and backward across a floor to be scrubbed. A scrub brush is rotated within a housing which is open at the bottom and water is supplied within the housing. The improvement consists of attaching double lipped suction squeegees at both the front and rear of the housing and connecting them both to a source of vacuum to suck up soiled water from the floor. The flexible squeegee lips are mounted in such a way that as the machine is moved forward the lips of the front squeegee fold together and shut off the airflow to it while the rear squeegee remains functional. When the machine is moved backward a reverse action of the squeegees occurs, so that there is always a functional squeegee sucking up soiled water behind the scrub brush while airflow to the opposite squeegee is shut off whether the machine is moving forward or backward.
Inventors
- 👤 Steven J. A. Waldhauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:45
CPC Classifications
A; A47; A47L; A47L11/00; A47L11/40; A47L11/4036; A47L11/4044; A47L11/29; A47L11/30; A47L11/4011; A47L11/4013; A47L11/4016; A47L11/4075; A47L11/408; A47L11/4083; A47L11/4088
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
In a scrubber, a mobile frame, at least one scrub brush attached to the frame to engage and work on a surface to be cleaned, an enclosure over the brush having a defined periphery approaching and opposing the surface, means for supplying a cleaning solution to the brush, squeegees engaging the surface on the front and rear portions of the periphery of the enclosure, a vacuum chamber associated with the enclosure in communication with the squeegees and a source of vacuum, and means for communicating only the rear squeegee to the vacuum chamber when the scrubber is moving forward and communicating only the front squeegee to the vacuum chamber when the scrubber is moving to the rear.
Claim 2
Dependent Claim
117 words
In a scrubber, a mobile frame, at least one scrub brush attached to the frame to engage and work on a surface to be cleaned, an enclosure over the brush having a defined periphery approaching and opposing the surface, means for supplying a cleaning solution to the brush, squeegees engaging the surface on the front and rear portions of the periphery of the enclosure, a vacuum chamber associated with the enclosure in communication with the squeegees and a source of vacuum, and means for communicating only the rear squeegee to the vacuum chamber when the scrubber is moving forward and communicating only the front squeegee to the vacuum chamber when the scrubber is moving to the rear.
Claim 3
Dependent Claim
20 words
The structure of claim 1 further characterized in that the communicating means automatically responds to the movement of the machine.
Claim 4
Dependent Claim
131 words
The structure of claim 2 further characterized in that the front and rear squeegees each include outer and inner elongated flexible spaced apart rubber-like blades, the bottom of the inner blade closely approaching engagement with the surface during operation, the outer blade being longer than the inner blade so that when the inner blade closely approaches engagement with the surface, the outer blade will be flexed in engagement with the surface, the differential length of the outer blade being such that it will flex toward and engage the inner blade to function as a check valve when the machine is moving in the direction of the outer blade and will flex away from and be in spaced relation to the inner blade when the machine is moving toward the inner blade.
Claim 5
Dependent Claim
39 words
The structure of claim 3 further characterized in that the squeegees are generally rectilinear and further including longitudinally disposed seals along the sides of the enclosure engaging the ends of the squeegees and also the surface to be cleaned.
Claim 6
Dependent Claim
38 words
The structure of claim 3 further characterized in that the outer blade of each squeegee has a corrugated outer surface so that liquid on the surface will pass under the outer squeegee blade when it is flexed inwardly.
Claim 7
Dependent Claim
37 words
The structure of claim 3 further characterized in that the inner blade of each squeegee has spaced notches along its lower edge to provide for liquid flow hen its bottom edge is in contact with the surface.
Claim 8
Dependent Claim
15 words
The structure of claim 1 further characterized in that the brush is a cylindrical brush.
Claim 9
Dependent Claim
29 words
The structure of claim 1 further characterized by and including a seal around the periphery of the enclosure engaging the surface, the squeegees being a part of the seal.
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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) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |