Fluid sprinkling – spraying – and diffusing – Including supply holder for material – Plural holders for diverse materials
Reexamination Certificate
2000-02-22
2001-08-21
Scherbel, David A. (Department: 3752)
Fluid sprinkling, spraying, and diffusing
Including supply holder for material
Plural holders for diverse materials
C239S407000, C239S413000, C239S416200, C134S102200, C015S320000
Reexamination Certificate
active
06276613
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a chemical foaming system, and more particularly to such a foaming system incorporated into a floor cleaning machine.
In one type of conventional floor cleaning machines, and more particularly a bonnet-type carpet cleaning machine, a cleaning chemical is applied to a bonnet of the machine and the bonnet is worked over the carpet to clean the carpet. The intent is for the soiling in the carpet to transfer to the bonnet. One disadvantage associated with this type of cleaning machine is that the bonnet instead tends to smear the soiling over the carpet. In a conventional rotary brush carpet cleaning machine, cleaning chemical is metered onto the carpet and worked into the carpet with a rotating nylon brush. The intent of this type of cleaning machine is to work the cleaning chemical into the carpet and capture the dirt within the chemical. This type of machine has also proven to be disadvantageous because it tends to leave wet spots on the carpet.
To this end, it is known to meter a dry foam onto the carpet instead of a liquid. Dry foam does not instantly revert back into a liquid, allowing any excess foam to be spread over the carpeting by the rotating brush and inhibiting the leaving of wet spots in the carpet. However, existing machines designed to employ dry foam cleaning technology are large and complex, requiring a substantial amount of labor and skill to operate.
SUMMARY OF THE INVENTION
Among the several objects of this invention are the provision of a chemical foaming system which generates a dry foam; the provision of such a system which minimizes foam production delay; the provision of such a system which can be used in combination with a carpet cleaning machine; and the provision of a carpet cleaning machine incorporating such a chemical foaming system which is relatively lightweight and easy to operate.
In general, a chemical foaming system for use in a floor cleaning machine comprises a foam generator and a delivery system upstream of the foam generator in communication with a source of pressurized fluid and a source of liquid cleaning solution. The delivery system delivers pressurized fluid and liquid cleaning solution to the foam generator. A dispensing system is disposed downstream of the foam generator for dispensing foam generated by the foam generator onto the floor being cleaned. The foam generator comprises a pair of independent foaming chambers in generally parallel flow relationship intermediate the delivery system and the dispensing system whereby a portion of pressurized fluid and liquid cleaning solution delivered to the foam generator by the delivery system flows into one of the foaming chambers. The remaining portion of the pressurized fluid and liquid cleaning solution delivered to the foam generator flows into the other foaming chamber. Each foaming chamber is adapted for generating a foam therein for dispensing onto the floor by the dispensing system.
In another embodiment, a chemical foaming system of the present invention for use in a floor cleaning machine comprises a source of pressurized fluid, a solution tank containing a liquid cleaning solution, and a foam generator in fluid communication with the source of pressurized fluid and with the solution tank for receiving pressurized fluid from the source of pressurized fluid and liquid cleaning solution from the solution tank and generating a foam therefrom to be dispensed onto a floor being cleaned. A fluid line provides fluid communication between the source of pressurized fluid and the foam generator for conveying pressurized fluid to the foam generator. A restriction in the fluid line upstream of the foam generator has an orifice sized to restrict the flow of pressurized fluid through the fluid line, thereby increasing the flow velocity of pressurized fluid downstream of the restriction for delivery to the foam generator.
REFERENCES:
patent: 2212598 (1940-08-01), Hagist
patent: 2384458 (1945-09-01), Dubay
patent: 2868584 (1959-01-01), Faust
patent: 2960710 (1960-11-01), McKeegan
patent: 3212762 (1965-10-01), Carroll et al.
patent: 3392418 (1968-07-01), Schowalter
patent: 3676889 (1972-07-01), Edlin
patent: 3940826 (1976-03-01), Phillips et al.
patent: 4000536 (1977-01-01), Nayfa et al.
patent: 4061001 (1977-12-01), von der Eltz et al.
patent: 4107075 (1978-08-01), Kramer
patent: 4167798 (1979-09-01), Klügl et al.
patent: 4167799 (1979-09-01), Webb
patent: 4429432 (1984-02-01), Copeland et al.
patent: 4667364 (1987-05-01), Meili
patent: 4780243 (1988-10-01), Edgley et al.
patent: 4974618 (1990-12-01), Nysted
patent: 5133107 (1992-07-01), MacDonald
patent: 5813086 (1998-09-01), Ueno et al.
patent: 5853814 (1998-12-01), Murphy
Alto US Inc.
Nguyen Dinh Q.
Scherbel David A.
Senniger Powers Leavitt & Roedel
LandOfFree
Chemical foaming system for floor cleaning machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Chemical foaming system for floor cleaning machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemical foaming system for floor cleaning machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2502916