Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1990-05-17
1992-04-21
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
15321, A47L 1134
Patent
active
051055031
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATION
The subject matter of the present Application is closely related to that of Applicant's copending Application Ser. No. 07/499,298, filed May 17th, 1990.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a cleaning head for use with an apparatus for cleaning floors, walls, carpets, curtains, upholstery and the like, and more particularly concerns a cleaning head for use in the process of water extraction cleaning, in which a carpet or the like is thoroughly wetted by a solution containing a suitable cleansing agent, such as a non-foaming detergent, and the carpet or the like is then dried by the uptake of that solution by means of suction. Such a cleaning head is the subject of our British Patent No. 1601455 and the present invention concerns a development of the design disclosed therein.
SUMMARY OF THE INVENTION
According to the present invention we provide an elongate cleaning head comprising a suction chamber having an open mouth and a centrally disposed outlet for connection to a source of suction, and an inner compartment extending substantially medially within the suction chamber and having side walls defining an open mouth substantially in the plane of the open mouth of the suction chamber, the inner compartment having associated therewith a cleaning liquid distributing chamber formed with a plurality of closely spaced fine outlet passageways adapted to allow cleaning liquid to flow into the inner compartment at a position spaced from the mouth thereof, wherein the suction chamber is divided into two laterally spaced suction zones by means of a central baffle which diverges in a direction away from the open mouth of the suction chamber towards an upper zone of the suction chamber into which upper zone said outlet opens.
The divided suction chamber with the upwardly divergent baffle causes the air flow through the head from the open mouth to the outlet to be split into two streams which diverge away from the centre of the head in the respective suction zones and then converge towards the outlet in the upper zone of the head. This arrangement makes it possible to increase the transverse width of the head without reducing the efficiency of the liquid pick-up operation and without increasing the overall air flow requirement. Thus in practice, the use of a cleaning head in accordance with the present invention typically makes it possible to utilise a cleaning head having a width of approximately 20 cm (8 inches) without increasing the air flow requirement over that which would otherwise be required for a 12.5 cm (5 inch) head whilst maintaining equivalent efficiency of operation.
In accordance with a further feature of the invention the inner compartment is formed or provided with a separating wall dividing it into an outer liquid delivery chamber adjacent to said open mouth of the inner compartment and an inner chamber which serves as said liquid distributing chamber, said outlet passageways being formed in said separating wall.
Preferably said liquid distribution chamber is so dimensioned to serve as a storage reservoir within the cleaning head, for the cleaning liquid, which reservoir has a height sufficient to create a substantially equal hydrostatic head pressure at each of the outlet passageways. Typically the height of the reservoir may be at least 10 mm.
Preferably said liquid distribution chamber has sufficient volume such that when substantially full a substantially equal flow rate of cleaning liquid from each of the outlet passageways can be achieved during application of the open mouth to a surface. Typically, the volume may be approximately 1 cc per linear centimeter of the head.
The open mouth of the inner compartment is preferably of elongate configuration and said inner compartment preferably extends across the suction chamber substantially parallel to the main axis thereof.
The open mouth of said inner compartment is preferably located substantially centrally within the open mouth of the suction chamber whereby
REFERENCES:
patent: 3747155 (1973-07-01), Koellisch
patent: 4185354 (1980-01-01), Brazier
patent: 4270238 (1981-06-01), Shallenberg et al.
Moore Chris K.
Vax Appliances (Australia) Pty Ltd
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