U.S. patent application number 10/749129 was filed with the patent office on 2004-11-11 for cleaning liquid dispensing system.
This patent application is currently assigned to Tennant Company. Invention is credited to Blanchard, Eric A., Christensen, Bryan L., Field, Bruce F..
Application Number | 20040221407 10/749129 |
Document ID | / |
Family ID | 34279072 |
Filed Date | 2004-11-11 |
United States Patent
Application |
20040221407 |
Kind Code |
A1 |
Field, Bruce F. ; et
al. |
November 11, 2004 |
Cleaning liquid dispensing system
Abstract
A cleaning liquid dispensing system for use in a mobile hard
surface cleaner. The system generally includes a cleaning agent
container, a cleaning agent supply line coupled to the cleaning
agent container, a flow control device, and a pressure regulator.
The cleaning agent container is configured to contain a supply of
cleaning agent. The flow control device includes a first input
coupled to the cleaning agent supply line, a second input, and an
output. The pressure regulator is configured to control a pressure
in the cleaning agent supply line and is positioned in line with
the cleaning agent supply line between the first input of the flow
control device and the cleaning agent container.
Inventors: |
Field, Bruce F.; (Golden
Valley, MN) ; Christensen, Bryan L.; (Dayton, MN)
; Blanchard, Eric A.; (Orono, MN) |
Correspondence
Address: |
Brian D. Kaul
Westman, Champlin & Kelly
Suite 1600
900 Second Avenue South
Minneapolis
MN
55402-3319
US
|
Assignee: |
Tennant Company
Minneapolis
MN
|
Family ID: |
34279072 |
Appl. No.: |
10/749129 |
Filed: |
December 30, 2003 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10749129 |
Dec 30, 2003 |
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10653347 |
Sep 2, 2003 |
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10653347 |
Sep 2, 2003 |
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10143582 |
May 9, 2002 |
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6735811 |
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10143582 |
May 9, 2002 |
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10026411 |
Dec 21, 2001 |
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6585827 |
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10653347 |
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10152537 |
May 21, 2002 |
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6671925 |
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10653347 |
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10152549 |
May 21, 2002 |
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10653347 |
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10328516 |
Dec 23, 2002 |
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6705332 |
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10653347 |
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10213849 |
Aug 7, 2002 |
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6662600 |
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60308773 |
Jul 30, 2001 |
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Current U.S.
Class: |
15/50.1 ;
15/320 |
Current CPC
Class: |
A47L 11/03 20130101;
A47L 11/4011 20130101; A47L 11/4083 20130101; B01F 3/04992
20130101; A47L 11/30 20130101; B01J 13/0095 20130101; A47L 11/4088
20130101 |
Class at
Publication: |
015/050.1 ;
015/320 |
International
Class: |
A47L 011/40 |
Claims
1. A cleaning liquid dispensing system for use in a mobile hard
surface cleaner comprising: a cleaning agent container configured
to contain a supply of cleaning agent; a cleaning agent supply line
coupled to the cleaning agent container; a flow control device
having a first input coupled to the cleaning agent supply line, a
second input, and an output; and a pressure regulator in line with
the cleaning agent supply line between the first input of the flow
control device and the cleaning agent container, the pressure
regulator adapted to control a pressure in the cleaning agent
supply line.
2. The system of claim 1, wherein: the cleaning agent supply line
defines a cleaning agent flow path; and the pressure regulator
includes an air inlet port and an airflow path between the air
inlet port and the cleaning agent flow path.
3. The system of claim 2, wherein the pressure regulator includes a
valve operable between an open position in which the airflow path
is open, and a closed position in which the airflow path is
closed.
4. The system of claim 2, wherein the pressure regulator includes a
check valve in the airflow path.
5. The system of claim 1 including a metering device in line with
the cleaning agent supply line and between the flow control device
and the cleaning agent container.
6. The system of claim 5, wherein the metering device includes an
orifice plate having an orifice.
7. The system of claim 6, wherein the orifice has a diameter of
0.010 inches or less.
8. The system of claim 5, wherein the metering device includes a
labyrinthine fluid flow path in line with the cleaning agent supply
line.
9. The system of claim 5, wherein the metering device includes a
needle valve.
10. The system of claim 1, wherein the flow control device includes
an injector component configured to receive a flow of cleaning
agent through the first input, inject the flow of cleaning agent
into a flow of primary cleaning liquid component received through
the second input to thereby form a flow of cleaning liquid, and
discharge the flow of cleaning liquid through the output.
11. The system of claim 10 including a cleaning liquid distributor
coupled to the outlet of the flow control device and configured to
receive the flow of cleaning liquid and discharge the flow of
cleaning liquid to a hard surface.
12. The system of claim 10, wherein the injector component includes
a venturi injector.
13. The system of claim 1, wherein the cleaning agent container is
collapsible.
14. The system of claim 13, wherein the cleaning agent container
includes a collapsible bag.
15. The system of claim 13, wherein the cleaning agent container
includes a removable cleaning agent cartridge.
16. The system of claim 1, including an aerator having an inlet
coupled to the output of the flow control device, an outlet, and a
gas inlet.
17. The system of claim 16, wherein: the flow control device is
configured to receive a flow of cleaning agent at the first input,
combine the flow of cleaning agent with a flow of primary cleaning
liquid component received at the second input, and discharge a flow
of cleaning liquid at the output; and the aerator is configured to
receive the flow of cleaning liquid from the output of the flow
control device at the inlet, inject gas into the flow of cleaning
liquid through the gas inlet, and discharge an output flow of
foamed cleaning liquid through the outlet.
18. The system of claim 17 including a cleaning liquid distributor
coupled to the outlet of the aerator and configured to receive the
flow of foamed cleaning liquid and discharge the flow of foamed
cleaning liquid for wetting of a surface.
19. The system of claim 18, wherein the distributor is configured
to direct the flow of foamed cleaning liquid directly to a hard
floor surface.
20. The system of claim 18, wherein the distributor is configured
to direct the flow of foamed cleaning liquid onto or adjacent to a
scrubbing member of a motorized scrubber.
21. The system of claim 18, wherein the distributor includes
distributing conduit having a first end coupled to the outlet of
the aerator.
22. The system of claim 21, wherein the distributing conduit
includes a section having a plurality of apertures.
23. The system of claim 21, wherein the distributing conduit
includes a substantially horizontal section having a closed end and
a plurality of apertures in a topside.
24. The system of claim 18, wherein the distributor includes a wand
member through which the flow of foamed cleaning liquid is
discharged.
25. The system of claim 24, wherein the wand member includes the
aerator and a section of tubing connecting the inlet of the aerator
to the output of the flow control device.
26. The system of claim 17, wherein the flow of foamed cleaning
liquid is proximately 0.5 gallons per minute or less.
27. A cleaning liquid dispensing system for use in a mobile hard
surface cleaner comprising: a cleaning agent container configured
to contain a supply of cleaning agent; a cleaning agent supply line
coupled to the cleaning agent container; a flow control device
having a first input coupled to the cleaning agent supply line, a
second input, and an output; a pressure regulator in line with the
cleaning agent supply line between the first input of the flow
control device and the cleaning agent container, the pressure
regulator adapted to control a pressure in the cleaning agent
supply line; and an aerator including an inlet coupled to the
output of the flow control device, an outlet, and a gas inlet.
28. The system of claim 27, wherein: the cleaning agent supply line
defines a cleaning agent flow path; and the pressure regulator
includes an air inlet port and an air flow path between the inlet
port and the cleaning agent flow path.
29. The system of claim 28, wherein the pressure regulator includes
a valve operable between an open position in which the airflow path
is open, and a closed position in which the airflow path is
closed.
30. The system of claim 28, wherein the pressure regulator includes
a check valve in line with the airflow path.
31. The system of claim 27 including a metering device in line with
the cleaning agent supply line and between the flow control device
and the cleaning agent container.
32. The system of claim 31, wherein the metering device includes an
orifice plate having an orifice.
33. The system of claim 32, wherein the orifice has a diameter of
0.010 inches or less.
34. The system of claim 31, wherein the metering device includes a
labyrinthine fluid flow path in line with the cleaning agent supply
line.
35. The system of claim 31, wherein the metering device includes a
needle valve.
36. The system of claim 27, wherein the flow control device
includes an injector component configured to receive a flow of
cleaning agent through the first input, inject the flow of cleaning
agent into a flow of primary cleaning liquid component received
through the second input to thereby form a flow of cleaning liquid,
and discharge the flow of cleaning liquid through the output.
37. The system of claim 36 including a cleaning liquid distributor
coupled to the outlet of the flow control device and configured to
receive the flow of cleaning liquid and discharge the flow of
cleaning liquid to a hard surface.
38. The system of claim 36, wherein the injector component includes
a venturi injector.
39. The system of claim 27, wherein the cleaning agent container is
collapsible.
40. The system of claim 39, wherein the cleaning agent container
includes a collapsible bag.
41. The system of claim 39, wherein the cleaning agent container
includes a removable cleaning agent cartridge.
42. The system of claim 27, wherein: the flow control device is
configured to receive a flow of cleaning agent at the first input,
combine the flow of cleaning agent with a flow of primary cleaning
liquid component received at the second input, and discharge a flow
of cleaning liquid at the output; and the aerated is configured to
receive the flow of cleaning liquid from the output of the flow
control device at the inlet, inject gas into the flow of cleaning
liquid through the gas inlet, and discharge an output flow of
foamed cleaning liquid through the outlet.
43. The system of claim 42 including a cleaning liquid distributor
coupled to the outlet of the aerator and configured to receive the
flow of foamed cleaning liquid and discharge the flow of foamed
cleaning liquid for wetting of a surface.
44. The system of claim 43, wherein the distributor is configured
to direct the flow of foamed cleaning liquid directly to a hard
floor surface.
45. The system of claim 43, wherein the distributor is configured
to direct the flow of foamed cleaning liquid onto or adjacent to a
scrubbing member of a motorized scrubber.
46. The system of claim 43, wherein the distributor includes
distributing conduit having a first end coupled to the outlet of
the aerator, whereby the flow of foamed cleaning liquid discharged
through the outlet of the aerator is received by the distributing
conduit.
47. The system of claim 46, wherein the distributing conduit
includes a section having a plurality of apertures.
48. The system of claim 46, wherein the distributing conduit
includes a substantially horizontal section having a closed end and
a plurality of apertures in a topside.
49. The system of claim 43, wherein the distributor includes a wand
member through which the flow of foamed cleaning liquid is
discharged.
50. The system of claim 49, wherein the wand member includes the
aerator and a section of tubing connecting the inlet of the aerator
to the output of the flow control device.
51. The system of claim 27, wherein the flow of foamed cleaning
liquid is proximately 0.5 gallons per minute or less.
52. A hard floor surface cleaner comprising: a mobile body; a tank
carried by the mobile body and configured to contain a supply of
primary cleaning liquid component; a cleaning agent container
configured to contain a supply of a cleaning agent; a cleaning
agent supply line coupled to the cleaning agent container; a flow
control device having a first input coupled to the cleaning agent
supply line, a second input coupled to the tank, and an output; and
a pressure regulator in line with the cleaning agent supply line
between the first input of the flow control device and the cleaning
agent container, the pressure regulator adapted to control a
pressure in the cleaning agent supply line.
53. The system of claim 52 including an aerator having an inlet
coupled to the output of the flow control device, an outlet, and a
gas inlet.
54. The cleaner of claim 52, wherein: the cleaning agent supply
line defines a cleaning agent flow path; and the pressure regulator
includes an air inlet port and an air flow path between the inlet
port and the cleaning agent flow path.
55. The cleaner of claim 54, wherein the pressure regulator
includes a valve operable between an open position in which the
airflow path is open and a closed position in which the airflow
path is closed.
56. The cleaner of claim 54, wherein the pressure regulator
includes a check valve in line with the airflow path.
57. The cleaner of claim 52 including a metering device in line
with the cleaning agent supply line and between the flow control
device and the cleaning agent container.
58. The cleaner of claim 57, wherein the metering device includes
an orifice plate having an orifice.
59. The cleaner of claim 58, wherein the orifice has a diameter of
0.010 inches or less.
60. The cleaner of claim 57, wherein the metering device includes a
labyrinthine fluid flow path in line with the cleaning agent supply
line.
61. The cleaner of claim 57, wherein the metering device includes a
needle valve.
62. The cleaner of claim 52, wherein the flow control device
includes an injector component configured to receive a flow of
cleaning agent through the first input, inject the flow of cleaning
agent into a flow of primary cleaning liquid component received
through the second input to thereby form a flow of cleaning liquid,
and discharge the flow of cleaning liquid through the output.
63. The cleaner of claim 62 including a cleaning liquid distributor
coupled to the outlet of the flow control device and configured to
receive the flow of cleaning liquid and discharge the flow of
cleaning liquid to a hard surface.
64. The cleaner of claim 62, wherein the injector component
includes a venturi injector.
65. The cleaner of claim 52, wherein the cleaning agent container
is collapsible.
66. The cleaner of claim 65, wherein the cleaning agent container
includes a collapsible bag.
67. The cleaner of claim 65, wherein the cleaning agent container
includes a removable cleaning agent cartridge.
68. The cleaner of claim 52, wherein: the flow control device is
configured to receive a flow of cleaning agent at the first input,
combine the flow of cleaning agent with a flow of primary cleaning
liquid component received at the second input, and discharge a flow
of cleaning liquid at the output; and the aerated is configured to
receive the flow of cleaning liquid from the output of the flow
control device at the inlet, inject gas into the flow of cleaning
liquid through the gas inlet, and discharge an output flow of
foamed cleaning liquid through the outlet.
69. The cleaner of claim 68 including a cleaning liquid distributor
coupled to the outlet of the aerator and configured to receive the
flow of foamed cleaning liquid and discharge the flow of foamed
cleaning liquid for wetting of a surface.
70. The cleaner of claim 69, wherein the distributor is configured
to direct the flow of foamed cleaning liquid directly to a hard
floor surface.
71. The cleaner of claim 69, wherein the distributor is configured
to direct the flow of foamed cleaning liquid onto or adjacent to a
scrubbing member of a motorized scrubber.
72. The cleaner of claim 69, wherein the distributor includes
distributing conduit having a first end coupled to the outlet of
the aerator, whereby the flow of foamed cleaning liquid discharged
through the outlet of the aerator is received by the distributing
conduit.
73. The cleaner of claim 72, wherein the distributing conduit
includes a section having a plurality of apertures.
74. The cleaner of claim 72, wherein the distributing conduit
includes a substantially horizontal section having a closed end and
a plurality of apertures in a topside.
75. The cleaner of claim 69, wherein the distributor includes a
wand member through which the flow of foamed cleaning liquid is
discharged.
76. The cleaner of claim 75, wherein the wand member includes the
aerator and a section of tubing connecting the inlet of the aerator
to the output of the flow control device.
77. The cleaner of claim 68, wherein the flow of foamed cleaning
liquid is proximately 0.5 gallons per minute or less.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application is: a Continuation-in-Part of U.S.
application Ser. No. 10/653,347, filed Sep. 2, 2003 and entitled
"FOAMED CLEANING LIQUID DISPENSING SYSTEM," which is a
Continuation-in-Part of U.S. application Ser. No. 10/143,582, filed
May 9, 2002 and entitled "CLEANING LIQUID DISPENSING SYSTEM FOR A
HARD FLOOR SURFACE CLEANER," which is a Continuation-in-Part of
U.S. application Ser. No. 10/026,411, filed Dec. 21, 2001 and
entitled "APPARATUS AND METHOD OF USE FOR CLEANING A HARD FLOOR
SURFACE UTILIZING AN AERATED CLEANING LIQUID," which in turn claims
the benefit of U.S. Provisional Application Serial No. 60/308,773,
filed Jul. 30, 2001 and entitled "APPARATUS AND METHOD OF USE FOR
CLEANING A HARD FLOOR SURFACE UTILIZING AN AERATED CLEANING
LIQUID"; a Continuation-in-Part of U.S. application Ser. No.
10/152,537, filed May 21, 2002 and entitled "CHEMICAL DISPENSER FOR
A HARD FLOOR SURFACE CLEANER"; a Continuation-in-Part of U.S.
application Ser. No. 10/152,549, filed May 21, 2002 and entitled
"CLEANING AGENT CARTRIDGE"; a Continuation-in-Part of U.S.
application Ser. No. 10/328,516, filed Dec. 23, 2002 and entitled
"HARD FLOOR SURFACE CLEANER UTILIZING AN AERATED CLEANING LIQUID";
and a Continuation-in-Part of U.S. application Ser. No. 10/213,849,
filed Aug. 7, 2002 and entitled "FOAMED CLEANING LIQUID DISPENSING
SYSTEM." All of the above-reference applications are incorporated
herein by reference in their entirety.
FIELD OF THE INVENTION
[0002] The present invention relates generally to mobile hard
surface cleaners and, more particularly, to a cleaning liquid
dispensing system for use in a hard surface cleaner.
BACKGROUND OF THE INVENTION
[0003] Hard floor surface cleaners are widely used to clean the
floors of industrial and commercial buildings. They range in size
from a small model that is controlled by an operator walking behind
the machine, which may clean a path ranging from 15 inches to 36
inches wide, to a large model that is controlled by an operator
riding on the machine, which may clean a path as wide as 5 feet.
These hard floor surface cleaners include motorized drive wheels, a
solution tank to hold a cleaning solution and a recovery tank to
hold soiled cleaning solution recovered from the floor being
scrubbed.
[0004] The cleaning solution from the solution tank is applied to
the hard floor surface adjacent a motorized scrub head. The
cleaning solution is typically a mixture of a cleaning agent and
water. The scrub head generally contains one or more scrubber
brushes attached either in front of, under, or behind the vehicle.
The scrubber brushes are rotated to provide the desired scrubbing
engagement with the hard floor surface. The soiled cleaning
solution is then recovered using a solution recovery system, which
returns the soiled cleaning solution to the recovery tank.
[0005] Conventional hard floor surface cleaners apply the cleaning
liquid to the floor at a high volume flow rate to provide complete
wetting of the floor being cleaned. This wetting of the hard floor
surface allows the scrub head to transfer dirt from the floor into
the cleaning liquid, which is then removed from the hard floor
surface and deposited in the recovery tank as soiled cleaning
liquid.
[0006] Unfortunately, the high volume flow rate of the cleaning
solution of prior art hard floor surface cleaners also results in
extended operational downtime due to the numerous disposals of
soiled cleaning solution and refills of cleaning solution that must
be performed for a given job. Such refills typically involve
manually filling the solution tank with water and mixing in a
cleaning agent or chemical to form the cleaning liquid. In addition
to being time-consuming, such manual mixing of the cleaning liquid
invites errors in the formulation. Typically, operators add too
much cleaning agent to the water, which results in an undesirable
residue of the cleaning agent on the floor. The residue can be
unsightly and slippery.
[0007] There is a continued demand for improvements to hard floor
surface cleaners including increasing the cleaning efficiency,
improving control of the cleaning liquid formulation, reducing
residue on the hard floor surface following a cleaning operation,
and other improvements.
SUMMARY
[0008] The present invention is directed to a cleaning liquid
dispensing system for use in a mobile hard surface cleaner. The
system generally includes a cleaning agent container, a cleaning
agent supply line coupled to the cleaning agent container, a flow
control device, and a pressure regulator. The cleaning agent
container is configured to contain a supply of cleaning agent. The
flow control device includes a first input coupled to the cleaning
agent supply line, a second input, and an output. The pressure
regulator is configured to control a pressure in the cleaning agent
supply line and is positioned in line with the cleaning agent
supply line between the first input of the flow control device and
the cleaning agent container.
[0009] Other features and benefits that characterize embodiments of
the present invention will be apparent upon reading the following
detailed description and review of the associated drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is simplified side elevation view of a hard floor
surface cleaner in accordance with embodiments of the
invention.
[0011] FIG. 2 is a cross-sectional view of a fluid recovery system
and recovery tank of a hard floor surface cleaner in accordance
with embodiments of the invention.
[0012] FIG. 3 is a schematic diagram of a cleaning liquid
dispensing system in accordance with embodiments of the
invention.
[0013] FIG. 4 is a simplified front elevation view of a hard floor
surface cleaner having an open front portion exposing a cleaning
liquid dispensing system in accordance with embodiments of the
invention.
[0014] FIG. 5 is a side plan view of components of a cleaning
liquid dispensing system in accordance with embodiments of the
invention.
[0015] FIG. 6 is a front plan view of an orifice plate of a
metering device in accordance with embodiments of the
invention.
[0016] FIG. 7 is a metering device in accordance with an embodiment
of the invention.
[0017] FIG. 8 is a front elevation view and partial cross-section
of a cleaning agent container in accordance with an embodiment of
the invention.
[0018] FIG. 9 is a front elevation view of a cleaning agent
cartridge illustrating various embodiments of the invention.
[0019] FIG. 10 is a perspective view of a housing of a cleaning
agent cartridge in accordance with embodiments of the
invention.
[0020] FIG. 11 is a perspective view of a cleaning agent cartridge
installed on a cartridge receiver in accordance with an embodiment
of the invention.
[0021] FIG. 12 is a cross-sectional view of an aerating nozzle in
accordance with embodiments of the invention.
[0022] FIGS. 13 and 14 are schematic diagrams of a foamed cleaning
liquid distributor and aerator in accordance with embodiments of
the invention.
[0023] FIG. 15 is a side cross-sectional view of a portion of a
scrub head and foamed cleaning liquid distributor in accordance
with an embodiment of the invention.
[0024] FIG. 16 is a schematic diagram of a foamed cleaning liquid
distributor and aerator in accordance with embodiments of the
invention.
[0025] FIG. 17 is a cross-sectional view of distributing conduit
shown in FIG. 16 taken generally along line 17-17.
[0026] FIG. 18 is a schematic diagram of a foamed cleaning liquid
distributor and aerator in accordance with embodiments of the
invention.
[0027] FIG. 19 is a schematic diagram of a foamed cleaning liquid
distributor in accordance with embodiments of the invention.
[0028] FIGS. 20 and 21 are simplified front and side views of a
leading portion of a hard floor surface cleaner in accordance with
embodiments of the invention.
[0029] FIG. 22 is a side elevation view of a scrubber-less hard
floor surface cleaner in accordance with embodiments of the
invention.
[0030] FIGS. 23 and 24 are simplified front and side views of a
leading portion of a hard floor surface cleaner in accordance with
embodiments of the invention.
DETAILED DESCRIPTION
[0031] One embodiment of the present invention is directed to a
cleaning liquid dispensing system, generally designated as 100, for
use with a hard surface cleaner, such as hard floor surface cleaner
110 shown in FIG. 1. Hard floor surface cleaner 110 is illustrated
as a walk-behind cleaner used to clean hard floor surfaces 111,
such as concrete, tile, vinyl, terrazzo, etc., over which cleaner
110 travels. Alternatively, cleaner 110 can be a ride-on or
towed-behind cleaner performing a scrubbing operation as described
herein. Cleaner 110 may include electrical motors powered through
an on-board power source, such as batteries, or through an
electrical cord. Alternatively, an internal combustion engine
system could be used either alone, or in combination with, the
electric motors.
[0032] Cleaner 110 generally includes a recovery tank 112, a lid
114, a cleaning liquid component tank 118, and a scrub head 120.
Lid 114 is attached along one side of the recovery tank 112 by
hinges (not shown) so that lid 114 can be pivoted up to provide
access to the interior of tank 112. Tank 118 contains a primary
cleaning liquid component (i.e. water) that is combined with a
cleaning agent by the dispensing system 100 to form a cleaning
liquid that can be applied to hard floor surface 111, as will be
discussed in greater detail below. Scrub head 120 includes a
scrubbing member 122, shrouds 124, and a scrubbing member drive
126. Scrubbing member 122 may be one or more brushes, such as
bristle brushes, pad scrubbers, or other hard floor surface
scrubbing elements. Drive 126 includes one or more electric motors
to rotate the scrubbing member 122. Drive 126 may also oscillate
scrubbing member 122. Scrub head 120 is attached to cleaner 110
such that scrub head 120 can be moved between a lowered cleaning
position and a raised traveling position. Other embodiments of
cleaner 110 will be discussed below that utilize alternative scrub
heads 120 and that eliminate the scrub head 120 completely.
[0033] A machine frame or mobile body 127 supports recovery tank
112 on wheels 128 and castors 129. Details of the frame are shown
and described in U.S. Pat. No. 5,611,105, the disclosure of which
is incorporated herein by reference. Wheels 128 are preferably
driven by a motor and transaxle assembly shown schematically at
130.
[0034] The rear of the frame 127 carries a linkage 131 to which a
fluid recovery device 132 is attached. In the embodiment of FIG. 1,
the fluid recovery device 132 includes a vacuum squeegee 134 and a
vacuum 135 communication with an inlet chamber of recovery tank 112
through a hose 136, which is illustrated in greater detail in FIG.
2. The bottom of the inlet chamber is provided with a drain 140
with a drain hose 142 connected to it. Soiled cleaning solution
that is collected by squeegee 134 is sucked into recovery tank 112
by vacuum 135. A residue of cleaning liquid typically remains on
the hard floor surface 111 until air dried. Alternative mechanical
devices, structures, or systems may be used to convey the soiled
solution from the floor surface into recovery tank 112.
[0035] Cleaner 110 can include a battery compartment 150 in which
batteries 152 reside. Batteries 152 provide power to drive motors
126, vacuum fan 154 of vacuum 135, and other electrical components
of cleaner 110. Vacuum fan 154 is mounted under lid 114. A control
unit 156 mounted on the rear of the body of cleaner 110 includes
steering control handles 158 and operating controls and gages for
cleaner 110. Additional aspects of automatic hard floor surface
cleaners are disclosed in U.S. Pat. Nos. 5,483,718, 5,515,568, and
5,566,422, each of which are incorporated herein by reference.
[0036] Cleaning liquid dispensing system 100 dispenses a wet foamed
cleaning liquid for use by the hard floor surface cleaner 110
during surface cleaning operations. In general, dispensing system
100 combines a cleaning agent with a primary cleaning liquid
component (i.e., water) to form a cleaning liquid, which is then
aerated to produce a foamed cleaning liquid for use by cleaner 110
to clean a hard floor surface. As will be discussed below, the
foamed cleaning liquid is a very wet foam that allows for the
complete wetting of the hard floor surface. Additionally, the
foamed cleaning liquid utilizes very little cleaning agent thereby
reducing the amount of residue remaining on the hard floor surface,
reducing chemical waste, and extending the life of the cleaning
agent supply.
[0037] FIG. 3 is a schematic diagram of cleaning liquid dispensing
system 100 in accordance with various embodiments of the invention.
FIG. 4 is a simplified front view of cleaner 110 that includes
dispensing system 100. FIG. 5 is a side plan view of components of
dispensing system 100 in accordance with embodiments of the
invention. Dispensing system 100 generally includes a cleaning
agent container 200 having a supply of cleaning agent 201, a
cleaning agent supply line 202, a flow control device 204, and a
pressure regulator 206.
[0038] Cleaning agent container 200 is configured to contain supply
of cleaning agent 201. The cleaning agent 201 may include one or
more surfactants, builders, solvents, or other components. In
accordance with one embodiment of the invention, cleaning agent 201
includes an anionic surfactant, a non-anionic surfactant, a
cationic surfactant, or a combination thereof. A particularly
preferred surfactant is DeTeric CP-Na-38 manufactured by DeForest
Enterprises, Inc. of Boca Raton, Fla. Cleaning agent is preferably
in a concentrated form (e.g., more than 30% solids). In accordance
with one embodiment of the invention, the cleaning agent container
200 is a collapsible container that collapses as the cleaning agent
contained therein is removed. This avoids a need to ventilate the
container, which could give rise to leaks and cause the cleaning
agent to dry out. In accordance with one embodiment of the
invention, container 200 is a collapsible bag that can be contained
in a cleaning agent cartridge 208 (FIG. 2), which will be discussed
in greater detail below.
[0039] Cleaning agent supply line 202 is coupled to the cleaning
agent container 200. Cleaning agent supply line 202 generally
corresponds to the fluid flow path formed by tubing 210 (FIG. 4)
and other components of system 100 to deliver cleaning agent 201
contained in container 200 to a first input 212 of flow control
device 204.
[0040] First input 212 of flow control device 204 is configured to
receive a flow of cleaning agent 214 from supply 200 through supply
line 202 and other components of system 100. Flow control device
204 is also configured to receive a flow of primary cleaning liquid
component 216 at a second input 218. Flow control device 204 is
further configured to combine the flows of cleaning agent 214 and
primary cleaning liquid component 216 and produce an output flow of
cleaning liquid 220 at an output 222.
[0041] The primary cleaning liquid component 216 is preferably
water and is contained in tank 118 of cleaner 110 or provided from
another source. The flow of primary cleaning liquid component 216
is preferably driven through conduit 226 by a pump 228 at a flow
rate that is desired for the cleaning operation. In accordance with
one embodiment of the invention, the flow of primary cleaning
liquid component 216 is driven at a substantially constant flow
rate of approximately 0.5 gallons per minute or less. However, the
flow rate can be modified depending on the application for system
100. Pump 228 is generally positioned in line with fluid conduit
226 and includes an outlet 230 that is maintained at a desired high
pressure. In accordance with one embodiment of the invention, the
pressure at outlet 230 is held substantially constant at
approximately 60 pounds per square inch (psi).
[0042] Flow control device 204 preferably combines the flow of
cleaning agent 214 with the flow of primary cleaning liquid
component 216 at a ratio of 1 part cleaning agent to 1000 parts
primary cleaning liquid component. Accordingly, the resultant
cleaning liquid 220 is formed of 0.1% cleaning agent, which is
substantially less than conventional hard floor surface cleaning
liquids. As a result, the present invention leaves very little
cleaning agent residue following application to a hard surface,
produces very little chemical waste, and increases the life of the
supply of cleaning agent contained in container 200.
[0043] Flow control device 204 injects the flow of cleaning agent
214 into the flow of primary cleaning liquid component 216 using an
injector 236 at a rate that is generally less than approximately
10.0 cubic centimeters per minute. In accordance with a preferred
embodiment of the invention, the flow of cleaning agent 214 is
preferably limited to less than approximately 2.0 cubic centimeters
per minute to provide the desired 0.1% concentration level of
cleaning agent in the cleaning liquid 220 relative to the flow of
primary cleaning liquid 216. For example, a flow rate of
approximately 1.2 cubic centimeters per minute is desired when the
flow rate of the primary cleaning liquid component is approximately
0.33 gallons per minute, and a flow rate of approximately 0.5 cubic
centimeters per minute is desired when the flow rate of the primary
cleaning liquid component is approximately 0.13 gallons per minute.
Injector 236 preferably operates to siphon the cleaning agent flow
214 from the supply 201 using a venturi member 238. In operation,
the flow of primary cleaning liquid 216 through venturi member 238
creates a vacuum of approximately 370 inches of water (134.6 psi),
that draws the flow of cleaning agent 214 into the flow of primary
cleaning liquid component 216 at the desired rate. One such
suitable flow control device 204 is the 50580 siphon produced by
Spraying Systems Company of Wheaton, Ill.
[0044] The vacuum produced by flow control device 204 allows the
cleaning agent supply 201 contained in collapsible bag 200 of
cleaning agent cartridge 208 to be completely drained regardless of
its position. That is, cleaning agent cartridge 208 can be
positioned below flow control device 204 without affecting the draw
of the cleaning agent 201 through supply line 202. However, it is
preferred that the diameter and length of conduit 210 forming
supply line 202 be selected to prevent substantial resistance to
the flow of cleaning agent 214 there through.
[0045] In accordance with one embodiment of the invention, the rate
of the flow of cleaning agent 214 through injector 236 is
adjustable using a valve 242, such as a needle seat valve, for
example. Valve 242 is preferably configured to provide accurate
adjustment to the slow output flow of cleaning agent 214. Valve 242
preferably includes a sharp needle having for example, a two degree
needle tip for improved sensitivity.
[0046] Although the valve 242 can be used to adjust the flow rate
of the of cleaning agent flow 214, problems can arise as a result
of the viscosity of the cleaning agent 201, the size of the orifice
of the needle seat valve 242, and the vacuum generated by injector
236. In particular, it has been discovered that the most consistent
cleaning agent flow rates are achieved when injector 236 generates
a large vacuum, such as 370 inches of water, in response to the
flow of primary cleaning liquid component 216. At such a high
vacuum, the valve 242 that is in line with injector 236 must close
the flow path through which the cleaning agent flow 214 travels to
such a degree that clogging of the flow path can occur, which
prevents accurate cleaning agent flow rate control. Unfortunately,
when valve 242 is adjusted to a large enough opening to avoid
clogging of the flow path for the cleaning agent, the opening is
generally too large to restrict the flow of cleaning agent 214 to
the desired rate. As a result, the cleaning agent flow rate would
be higher than the preferred flow rate without additional
controls.
[0047] The pressure regulator 206 of system 100 provides the
desired additional control over the flow rate of the cleaning agent
flow 214 to accurately control the flow rate of the flow of
cleaning agent 214 into the flow of primary cleaning liquid
component 216. Pressure regulator 206 is positioned in line with
the cleaning agent supply line 202 between the first input 212 of
the flow control device 204 and the cleaning agent container 200.
Pressure Regulator 206 generally operates to maintain the pressure
at first input 212 of flow control device 204 at a preferred
pressure to provide the desired flow rate for the flow of cleaning
agent through the flow control device 204. As the pressure in
supply line 202 is decreased by pressure regulator 206, the
volumetric flow rate of the cleaning agent flow 214 decreases. As a
result, the pressure regulator 206 can be used to control the flow
rate of the cleaning agent flow 214 to the desired low flow rate
for the given flow control device 204 being used including a flow
control device 204 that includes a valve 242 having a large enough
opening to avoid clogging by the cleaning agent.
[0048] In accordance with one embodiment of the invention, pressure
regulator 206 includes an air inlet port 244 and an airflow path
246, as shown in FIG. 5. The airflow path 246 extends between a
cleaning agent flow path 248 and the air inlet port 244. The
cleaning agent flow path 248 is generally defined by the cleaning
agent supply line 202, such as the flow path through component 250,
to which pressure regulator connects. Component 250 can be a check
valve to prevent the undesired backflow of cleaning agent 201
and/or primary cleaning liquid component 216 from flow control
device 204. Pressure regulator 206 can include a valve that is
either located adjacent to the supply line 202, such as valve 252,
or located remotely therefrom, such as valve 254. Valve 252 or 254
is preferably operable between an open position in which the
airflow path 246 is open to allow air, indicated by arrow 256, to
enter through air inlet port 244 and into the flow of cleaning
agent 214, and a closed position, in which the air flow path 246 is
closed. The valve (252 or 254) can be adjusted or pre-set to
operate to maintain the pressure at the cleaning agent flow path at
the desired level relative to the ambient pressure by opening when
the pressure at first inlet 212 of flow control device 204 drops
below a threshold minimum. In accordance a preferred embodiment of
the invention, pressure regulator 206 is a relief-check valve
assembly, such as a 4-6 psi relief-check valve assembly. Such
pressure regulators are available from Smart Products, Inc. of San
Jose, Calif.
[0049] During normal operation, the flow of primary cleaning liquid
component 216 through venturi member 238 generates a vacuum of
approximately 370 inches of water at the first input 212 of flow
control device 204 when valve 252 or 254 of pressure regulator 206
is closed or pressure regulator 206 is not present. At this high
pressure, the flow of cleaning agent 208 is injected into the flow
of primary cleaning liquid at a rate of much greater than 2.0 cubic
centimeters per minute. However, when valve 252 and/or 254 are
open, the vacuum generated by flow control device 204 causes air
256 to be drawn in through air inlet port 244 and airflow path 246
of pressure regulator 206 and into the flow of cleaning agent 214.
This reduces the pressure at the first inlet 212 of the flow
control device 204 to a desired level and controls the flow rate of
the cleaning agent flow 214 injected into the flow of primary
cleaning liquid 216.
[0050] The particular settings for pressure regulator 206 can be
selected empirically based upon the vacuum generated by flow
control device 204 and the desired flow rate for the flow of
cleaning agent 214. For example, when pressure regulator 206 is a 6
psi relief-check valve, the vacuum at the first input of flow
control device can be reduced from 370 inches of water to
approximately 150 inches of water, thereby causing the resultant
flow rate of the flow of cleaning agent that is injected into the
flow of primary cleaning liquid component to drop to approximately
1.2 cubic centimeters per minute when valve 242 is property set or
when a suitable metering device 260 (FIGS. 3 and 5) is installed in
line with supply line 202. When pressure regulator 206 is a 5 psi
relief-check valve, the vacuum at the first input 212 of flow
control device 204 can be reduced from 370 inches of water to
approximately 110 inches of water, thereby causing the resultant
flow rate of the flow of cleaning agent 214 that is injected into
the flow of primary cleaning liquid component 216 to drop to
approximately 0.5 cubic centimeters per minute. Accordingly, the
selection or setting of pressure regulator 206 can determine the
pressure drop at the inlet 212 of flow control device 204 and the
resultant flow rate of the flow of cleaning agent 214 that is
injected into the flow of primary cleaning liquid component
216.
[0051] The valve 252 and/or 254 of pressure regulator 206 controls
the introduction of air 256 into supply line 202 and, therefore,
the amount of vacuum relief and the resultant flow rate of the flow
of cleaning agent 214. In accordance with one embodiment of the
invention, valve 252 is controllable by an operator of system 100,
such as an operator of a hard floor surface cleaner 110 in which
system 100 is installed. In general, valve 254 can be formed as a
component of a remote airflow control 262 (FIG. 5) and can be used
to control the airflow 256 through airflow path 246 that extends to
valve 254 through tubing 264. Valve 254 is preferably biased (e.g.,
spring-loaded) toward an open position, in which air 256 is allowed
to enter tubing 264. Valve 254 can be closed by the operator to
close the airflow path 240 regardless of the position of valve 252.
Accordingly, even if valve 252 is open, valve 254 of remote airflow
control 262 can close the airflow path 246 and cause the vacuum at
the input 212 of flow control device 204 to increase and thereby
draw the flow of cleaning agent 214 into the flow of primary
cleaning liquid component 216 at a high rate. Such a surge in the
flow rate of the cleaning agent may be used when an increase in the
concentration of the cleaning agent 214 in the cleaning liquid 220
is desired for special cleaning operations or to drive potentially
clogging debris through the flow control device 204 or metering
device 260.
[0052] Additional control of the flow rate of the flow of cleaning
agent 214 can be provided by a metering device 260, shown in FIG.
3, which is positioned in line with the cleaning agent supply line
202 between the flow control device 204 and the cleaning agent
container or supply 200. Metering device 260 can be positioned on
either side of pressure regulator 206. Metering device 260 includes
an upstream high pressure side 220 and a downstream low pressure
side 272. The pressure drop across metering device 260 between high
pressure side 270 and low pressure side 272 restricts the flow of
fluid there through to further control the flow rate of the flow of
cleaning agent 214. Multiple metering devices 260 can be positioned
in series to provide the desired pressure drop in the fluid flow
214.
[0053] In accordance with one embodiment of the invention, metering
device 260 includes a metering orifice or orifice plate 274, as
shown in FIG. 5. The exemplary orifice plate 274 shown in FIG. 6
includes an orifice 276 through which the flow of cleaning agent
214 flows. Plate 274 is installed in supply line 202, such that the
cleaning agent 214 is forced to flow through orifice 276. This
produces the pressure drop as described above and restricts the
flow 214 to the desired flow rate. In accordance with a preferred
embodiment, orifice 276 of orifice plate 274 has a diameter D of
0.006 inches. One example of a suitable metering orifice or orifice
plate 274 is part number CP 4916-40 manufactured by Spraying
Systems Co. of Wheaton, Ill. Other orifice plates or metering
orifice configurations are possible as well, such as by providing
multiple orifices in the plate 98 or other flow restriction
configurations.
[0054] In accordance with another embodiment of the invention,
metering device 2604 includes a labyrinthine fluid flow path to
provide the desired flow restriction. The labyrinthine path is
preferably formed by one or more drip irrigators 278, as shown in
FIG. 7. One such preferred drip irrigator suitable for use in
metering device 260 is described in U.S. Pat. No. 5,031,837 and
available as part number R108C manufactured by Raindrip of Woodland
Hills, Calif. One or more drip irrigators 278 can are placed in
series and coupled together with tubing sections 280, as shown in
FIG. 7. A surround 282 can cover the drip irrigators 278 and tubing
sections 280. Inlet 284 and outlet 286 couple to conduit 210 of
supply line 202. Other suitable drip irrigators or similar flow
restricting devices can also be used to form metering device
124.
[0055] In accordance with one embodiment of the invention, system
100 includes one or more additional supplies 200 of cleaning agent
201, as shown in FIG. 3, that can be selectively mixed with the
flow of primary cleaning liquid component 216. Thus, system 100 can
include a second supply of cleaning agent 290, such as a surfactant
as described above for first cleaning agent supply 200.
Alternatively, second cleaning agent supply 290 can be a
brightener, a disinfectant, or other surface treatment chemical.
Supply of second cleaning agent 290 is preferably contained in a
container, such as collapsible bag 308, of a cleaning agent
cartridge as will be discussed below with respect to first cleaning
agent supply 200.
[0056] In accordance with one embodiment of the invention, a second
flow control device 2922, which is substantially identical to flow
control device 204, is provided to control the injection of a flow
294 of the second cleaning agent from supply 290. Additionally, a
valve 293, a pressure regulator 294 and/or a metering device 296
can also be included to provide additional control over the flow
294 of the second cleaning agent. Valves, such as valves 242 and
293, can be selectively opened and closed to control whether one or
both of the first and second cleaning agent supplies 200 and 290 is
added to the flow of the primary cleaning liquid component 216 to
form the desired cleaning liquid 220.Alternatively, second cleaning
agent supply 290 can be fed to valve 298 system 100, which can be a
multi-way valve capable of selecting the first cleaning agent
supply 200 of the second cleaning agent 290 to be passed to flow
control device 204 thereby eliminating the need for the second flow
control device 292 and the related components.
[0057] The supplies of cleaning agent, such as first and second
supplies 200 and 290 (FIG. 3), are preferably contained in a
collapsible container 200 that can be a component of a cleaning
agent cartridge 208, which will be discussed in greater detail with
reference to FIGS. 8-11. Cleaning agent cartridge 208 generally
includes collapsible container 200 having an interior cavity 300
and conduit 302, as shown in FIG. 8. Conduit 302 includes a first
end 304 that is coupled to interior cavity 300 and a second end 306
that is connectable to flow control device 204 through, for
example, cleaning agent supply line 202. A volume of 2.8 liters,
for example, of the cleaning agent 201 can preferably be contained
within interior cavity 300 for dispensing to flow control device
204 through supply line 202.
[0058] Container 200 is preferably a collapsible bag that is
completely sealed except where connected to conduit 302. Thus,
container 200 shrinks as the cleaning agent 201 stored therein is
depleted. In accordance with this embodiment, container 200 can be
formed of vinyl or other suitable material. Alternatively,
container 200 can take the form of a rigid container, such as a
box, that includes a vent for replacing dispensed cleaning agent
201 with air. Container 200 can be transparent or translucent to
allow the cleaning agent 201 to be viewed. Additionally, container
200 can be formed of a material that prevents the exposure of the
cleaning agent contained therein from light.
[0059] First end 304 of conduit 302 is preferably attached to
container 200 such that it is flush with the inside of outlet 308.
A seal 310 is formed between first end 304 and container 200 at
outlet 308 to prevent cleaning agent 201 from escaping at that
junction. In accordance with one embodiment, seal 310 includes an
annular neck 312 surrounding first end 304 and adjoining container
200. A weld can be formed between annular neck 312, first end 304
and container 200 to further seal the junction. Other methods for
sealing the junction of first end 304 and container 200 can also be
used.
[0060] Conduit 302 can also include a flow control member 314,
shown in FIG. 9, mounted to second end 306 of conduit 302 to
terminate the flow of cleaning agent 201 therethrough when conduit
302 is disconnected from flow control device 204. Flow control
member 314 preferably includes a connector (e.g., quick-disconnect
coupling) 316 that includes a shut-off valve that is actuated when
disconnected from flow control device 204 to seal container 200 and
prevent the out flow of cleaning agent 201 therethrough. Other
types of flow control members 314 can also be installed at second
end 306 of conduit 302 to seal interior cavity 300 of container 200
such as a valve, a metering device, a clamp, a membrane, or a
cap.
[0061] In accordance with one embodiment of the invention, cleaning
agent cartridge 208 includes a housing 318, shown in FIG. 10, that
can enclose container 200, conduit 302, connector 316 and flow
control member 352. Housing 318 provides protection and support to
container 200, which is particularly useful when container 200 is
in the form of a collapsible bag 308. Housing 318 is preferably
made from a single piece of rigid or semi-rigid material, such as
plastic, cardboard and/or metal that is folded to form a box, which
is preferably glued shut at, for example, tab 320. In accordance
with a preferred embodiment, housing 318 is formed of corrugated
plastic or cardboard.
[0062] Housing 318 also includes openings 322 and 324 on at least
one side wall 326 that are preferably defined by removable portions
328 and 330, respectively. Portions 328 and 330 have perforated
edges 332 and 334, which facilitate their easy removal to expose
openings 322 and 324. Housing 318 can also include apertures 336
and 338 to provide finger access to further simplify the removal of
portions 328 and 330. Opening 322 generally provides visual access
to container 200 and allows a user to asses the volume of cleaning
agent 201 contained therein. Opening 324 also provides access to
conduit 302, connector 316 and flow control member 352 for
connection to flow control device 204. In accordance with one
embodiment of the invention, opening 324 and removable portion 330
can also be formed on bottom 340 through which conduit 302 can
extend for efficient dispensing of the cleaning agent 201 in
container 200, as shown in FIG. 10. Other openings can also be
provided in housing 318 as desired.
[0063] Cleaning agent cartridge 208 is preferably removably
receivable in a cartridge receiver 342 of cleaner 110, shown in
FIG. 11. Cartridge receiver 342 can be a bracket having a back
plate 344, opposing side walls 346 and 348, a front wall 350, and a
bottom 352. Back plate 344 is mountable to a wall of cleaner 110 to
position cleaning agent cartridge 208 proximate flow control device
204. Bottom 352 and side wall 346 include an opening through which
conduit 302 can extend for connection to flow control device 204.
Cartridge 208 can be secured to cartridge receiver 342 using a
strap or other suitable means. Due to the limited jostling that
occurs during cleaning operations, such securing devices are
typically unnecessary. Multiple cleaning agent cartridges 234 can
be provided proximate their corresponding flow control device 204
to accommodate the multiple chemical dispenser embodiment of the
invention illustrated in FIG. 3.
[0064] In operation, cleaning agent cartridge 208 is provided and a
cleaning agent container 200 is stored in interior cavity 300 of
container 200. Next, second end 306 of conduit 302 is coupled to
flow control device 204 and cartridge 208 is installed in cartridge
receiver 342. Flow control device 204 can then receive the cleaning
agent container 200 through conduit 302, which connects to conduit
210 to form supply line 202, and provide a controlled output flow
208 of cleaning agent, as discussed above. When container 200 is a
collapsible bag 308, container 200 collapses in response to the
output flow of cleaning agent 208.
[0065] In accordance with another embodiment of the invention,
cleaning liquid dispensing system 100 includes an aerator 400.
Aerator 400 is configured to receive the output flow of cleaning
liquid 220 and aerate the cleaning liquid to produce an output flow
of foamed cleaning liquid 402. A foamed cleaning liquid distributor
404 can receive the output flow of foamed cleaning liquid 402 and
discharge the output flow 402 for wetting of a hard surface 406, as
illustrated in FIG. 3.
[0066] Aerator 400 preferably includes at least one aerating nozzle
420, as shown in FIG. 4 and the simplified cross-sectional view of
FIG. 12. Nozzle 420 includes a nozzle body 422 having an inlet 424
coupled to the output 222 of the flow control device 204 for
receiving the output flow of cleaning liquid 220. A suitable
fitting 426 (FIG. 4) can connect to nozzle 420 at threaded section
428 (FIG. 12) to couple inlet 424 to conduit 430 through which
cleaning liquid flow 220 travels from output 222 of flow control
device 204. The output flow of cleaning liquid 220 travels through
a bore 432 toward an outlet 434 of nozzle 420. The bore 432
includes a constricted throat portion 436 having a convergent
upstream end 438 and a divergent downstream end 440. Nozzle 420
also includes one or more gas inlets or radial ports 442 extending
through a side 444 of the body 422 to throat 436. Air, represented
by arrows 446, is sucked through one or more gas inlets or radial
ports 442 in response to a vacuum generated within throat 436 by
the output flow of cleaning liquid 220 for mixing therewith. The
aeration of the cleaning liquid 220 by air induction through radial
ports 442 produces the aerated or foamed cleaning liquid 402 that
is discharged through outlet 434 of nozzle 420. It should be
understood that some aeration of cleaning liquid occurs upstream of
aerator 400 due to the injection of air into the flow of cleaning
agent 214 by pressure regulator 206. One example of a suitable
nozzle 420 is the "FoamJet" nozzle (also designated as
FJP-20015-CE) produced by Spraying Systems Company of Wheaton,
Ill.
[0067] A check valve, such as check valve 450 shown in FIG. 4, is
preferably upstream of outlet 434 of nozzle 420 to terminate the
flow of cleaning liquid 220 through nozzle 420 when pump 228 is
deactivated. In accordance with one embodiment of the invention,
the check valve 450 is integrated into nozzle 420.
[0068] The foamed cleaning liquid 402 from aerator 400 is a very
wet foam relative to that used by carpet cleaners. Such a wet foam
is necessary to provide the desired wetting of the hard floor
surface. A foam's "wetness" or "dryness" may be defined in relation
to this volumetric expansion ratio. A "dry" foam has a higher
expansion ratio as compared to a "wet" foam. High-expansion foams
are "dry" due to the high ratio of air to water and are useful in
carpet cleaning to facilitate quick drying of the cleaned carpet. A
"wet" foam is not used in carpet cleaning devices since they can
cause excessive wetting of the carpet, which leads to long drying
times and may result in mold development. In a particular
embodiment of the invention, the ratio of volumes between the
cleaning liquid (non-aerated) 220 and the foamed cleaning liquid
402 is approximately 1:8. For example, 0.15 gallons of cleaning
liquid is aerated to occupy 1.25 gallons. Other volume ratios may
yield acceptable wetting results as well.
[0069] Cleaning liquid dispensing system 100 can also include a
foamed cleaning liquid distributor 404, shown schematically in FIG.
3. Foamed cleaning liquid distributor 404 is generally configured
to direct the output flow of foamed cleaning liquid 402 for wetting
of a surface 406, such as the surface ill on which cleaner 110
travels; wetting the scrubbing member 122 of scrub head 120; or
other surfaces as will be discussed below. In accordance with one
embodiment of the invention, foamed cleaning liquid distributor 404
includes nozzle 420, which directs the output flow of foamed
cleaning liquid 402 directly to the desired surface 406, as
illustrated in the schematic diagram of FIG. 13. One or more
nozzles 420 can be coupled to the output flow of cleaning liquid
220 by conduit 430 to cover a wide section of surface 406 that
extends across a width of cleaner 110. Outlet 434 of each nozzle
420 is preferably slotted to provide wide dispersion of the foamed
cleaning liquid output flow 402. As mentioned above, check valves
450 can be placed upstream of outlet 434 of nozzle 420 to prevent
passage of cleaning liquid 220 through conduit 430 when pump 228
(FIGS. 3 and 4) is deactivated.
[0070] In accordance with another embodiment of the invention,
foamed cleaning liquid distributor 404 receives the output flow of
foamed cleaning liquid 402 from outlet 434 of nozzle 420 and
discharges the output flow of foamed cleaning liquid 402 for
wetting of the desired surface 406, such as surface 111, as shown
in FIG. 14. In accordance with one embodiment of the invention,
foamed cleaning liquid distributor 404 includes distributing
conduit 452 having a first end 454 coupled to outlet 434 of nozzle
420 that receives the foamed cleaning liquid flow 402 and
discharges the flow 402 to the desired surface 406, as shown in
FIGS. 1, 4 and 14. Distributing conduit 452 can include one or more
sections or branches 456 that receive foamed cleaning liquid flow
402 from a second end 458 of conduit 452 and operate to spread out
the discharging of the foamed cleaning liquid flow 402 directly to
surface 406, such as surface 111 across the width of cleaner 110,
as shown in FIG. 14. Check valves 460 can be provided in each
branch 456 of distributing conduit 452, or in line with the branch
462 of distributing conduit 452 receiving the cleaning liquid flow
402 from outlet 434 of nozzle.
[0071] Branches 456 can also be configured to discharge the foamed
cleaning liquid flow 402 onto scrubbing member 122 of scrub head
120, as shown in FIGS. 1 and 4, which in turn wets surface 111. As
illustrated in FIG. 15, distributing conduit 452 can discharge
foamed cleaning liquid flow 402 into an annular trough 464 in the
hub 466 of the rotating scrubbing members 122. A series of holes
468 in the bottom of trough 464 pass the foamed cleaning liquid 402
down to the central region of the scrubbing member 122. During
operation, the foamed cleaning liquid 402 is centrifuged out under
the scrubbing member 122 in contact with-the hard floor surface
111.
[0072] Another embodiment of distributing conduit 452 is
illustrated in the front plan view of FIG. 16 and the
cross-sectional view of FIG. 17 taken generally along line 17-17 of
FIG. 16. Distributing conduit 452 includes one or more
substantially horizontal sections or branches 456 that include a
plurality of apertures 470 in a top side 472 that is opposite a
floor-facing side 474. Sections 456 of distributing conduit 452 are
preferably formed of rigid plastic tubing that is mounted to
cleaner 110 in a desired location. Each section 456 includes an end
cap 476 closing an end 478. During operation, foamed cleaning
liquid flow 402 travels into closed sections 456. Once sections 456
fill with foamed cleaning liquid 402, the foamed cleaning liquid
402 is discharged through apertures 470. The discharged foamed
cleaning liquid 402 flows over the exterior surface 480 of sections
456 and drops to the surface immediately below, such as surface
111. Preferably, the apertures 470 positioned closest to ends 478
have a larger diameter than those farther from ends 478 to
compensate for pressure drops in sections 456. This design of
foamed cleaning liquid distributor 404 prevents undesirable
dripping of foamed cleaning liquid 402 to the surface following
deactivation of pump 228 of dispensing system 100 by containing the
foamed cleaning liquid 402 within sections 456 of distributing
conduit 452.
[0073] In accordance with another embodiment of the invention,
foamed cleaning liquid distributor 404 includes a wand member 490,
shown in FIG. 18, that allows a user to direct the foamed cleaning
liquid to a surface 492 that is remote from cleaner 110. Wand
member 490 generally includes a rigid tubing section 494 supporting
nozzle 420 of aerator 400 at a dispensing end 496. Accordingly,
wand member 490 can operate in the manner described above with
reference to FIG. 13. A length of flexible tubing 430 connects a
receiving end 498 to output 222 of flow control device 204. During
operation a user can extend the tubing 430 from cleaner 110 and
apply the foamed cleaning liquid 402 to remote hard surface 492,
such as a wall or an object, for cleaning.
[0074] FIG. 19 is a schematic diagram of a foamed cleaning liquid
distributor 404 that includes first and second distributing
components 500 and 502, respectively. The discharging of foamed
cleaning liquid 402 through either first or second distributing
component 500 or 502 is controlled by a valve 504. First and second
distributing components 500 and 502 can comprise any of the
embodiments of foamed cleaning liquid distributor 404 described
above. For example, first distributing component 500 can take the
form of wand member 490 (FIG. 18) and second distributing component
502 can take the form of distributing conduit 452 shown in FIG. 14.
As a result, foamed cleaning liquid 402 can be easily applied to
different types of surfaces, such as surfaces 506 and 508.
[0075] As discussed above, hard floor surface cleaner 110 can be
configured to include a motorized scrub head 120 that includes a
scrubbing member 122 that is configured for rotating engagement
with hard floor surface 111, over which the mobile body 127 of
cleaner 110 travels. FIGS. 20 and 21 show simplified front and side
views of a front or leading portion of a cleaner 110 that includes
a scrub head 120 in accordance with another embodiment of the
invention. Scrub head 120 includes a scrubbing member 122 formed of
a plurality of discs 510 mounted to a shaft 512 that is rotated by
a motor (not shown). The discs 510 are preferably concentrically
aligned with the axis of rotation 514 of the shaft 512 and can be
positioned to engage surface 111. Discs 510 can be mounted to shaft
512 using glue or other suitable means. Discs 510 are preferably
formed of a liquid absorbing material, such as material composed of
approximately 70% polyester and 30% polyamide, or microfiber. Such
liquid absorbing material is known to hold many times its weight in
viscous liquid. Additionally, such material collects dirt, dust,
mildew and other materials without a need for a large volume of
foamed cleaning liquid 402, thereby eliminating a need for fluid
recovery device 132 (FIG. 1). Large particles of dirt and dust that
do not adhere to the discs 510 can be captured by a debris
collector 516 positioned immediately behind scrub head 120. Another
advantage to the vertically oriented discs 510 is that they can
clean grooves that may be encountered in tile, brick, cement, and
rock floors. As illustrated in FIG. 21, foamed cleaning liquid
distributor 404 can discharge the foamed cleaning liquid 402 to a
leading side 518 of scrub head 120 as indicated by arrow 520, on
discs 510 as indicated by arrow 522, or even through the scrubbing
member 122.
[0076] FIG. 22 is a simplified side elevation view of another
embodiment of hard floor surface cleaner 110 that does not include
a motorize scrub head 120. Such a scrubber-less cleaner 110 can be
used on delicate floor surfaces that would be susceptible to
abrasive damage from contact with rotating scrubbing members 122.
Cleaner 110 relies upon the cleaning power of the foamed cleaning
liquid 402 that is applied to hard floor surface 111 by system 100,
as illustrated by arrow 530, to clean the surface 111. The wetting
of the floor with the foamed cleaning liquid 402 traps dirt
particles with the bubbles of the foam, which are then carried into
the recovery tank 112 by the fluid recovery system 132. The
scrubber-less cleaner 110 uses far less power than those including
motorized scrub heads 120 thereby allowing for the removal of some
of the batteries 152 used to power cleaner 110. Scrubber-less
cleaner 110 can also be formed much lighter and smaller due to the
elimination of scrub head 120 and batteries 152, or the solution
and recovery tanks 118 and 112 can be formed larger to accommodate
longer operational runtimes for cleaner 110. Finally, the
elimination of some of the components of cleaner 110 allows
scrubber-less cleaner 110 to be manufactured quicker and cheaper
that those incorporating scrub heads 120.
[0077] In order to facilitate complete wetting of hard floor
surface 111, cleaner 110 can include a non-motorized wetting
component 540, shown in FIGS. 23 and 24, which are front and side
views of a leading portion of cleaner 110, respectively. Wetting
component 540 generally includes a plurality of liquid dispersing
members 542 each having a first end 544 that is connected adjacent
to a bottom side 546 of mobile body 127 of cleaner 110. A second
end 548 of each liquid dispersing member 542 is positioned to
engage hard floor surface 111. Liquid dispersing members 542 are
preferably formed of a soft material that conforms to surface 111.
Foamed cleaning liquid 402 is discharged by foamed cleaning liquid
distributor 404 of dispensing system 100 either on members 542 as
indicated by arrow 550, or to a leading side of members 542 as
indicated by arrow 552, as shown in FIG. 24. Liquid dispersing
members 542 evenly distribute the foamed cleaning liquid 402 on
surface 111 as cleaner 110 moves across surface 111. Cleaner 110
may include a scrub head 120 downstream of liquid dispersing
members 542 to scrub surface 111 with evenly distributed foamed
cleaning liquid 402 thereon, or cleaner 110 can be scrubber-less
and a portion of the foamed cleaning liquid 402 can be removed from
surface 111 by fluid recovery system 132.
[0078] Another embodiment of the invention is directed to a foamed
cleaning liquid dispensing kit that is configured to be retrofitted
to a hard surface cleaner 110 that includes a primary cleaning
liquid component dispenser (i.e., tank 218 and pump 228) that is
configured to provide an output flow 216 of primary cleaning liquid
component (FIG. 3). The kit includes packaging that can contain a
supply of cleaning agent (such as supply 200), a flow control
device (such as 204), a supply line (such as 202) comprising
sections of conduit, a pressure regulator (such as 206), a metering
device (such as 260), and an aerator (such as 400) that are formed
in accordance with the embodiments described above. The packaging
can be any suitable packaging such as a bag, a shrink-fit package,
a box, a canister, etc. In accordance with one embodiment of the
invention, cleaning agent container 200 is contained in a cleaning
agent cartridge 208. Additionally, embodiments of foamed cleaning
liquid distributor 404 can be included in the kit and contained in
the packaging.
[0079] Although the present invention has been described with
reference to preferred embodiments, workers skilled in the art will
recognize that changes may be made in form and detail without
departing from the spirit and scope of the invention. It should be
understood that fittings, couplings and other conventional
components have not been illustrated to simplify the figures.
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