U.S. patent number 3,633,240 [Application Number 05/010,763] was granted by the patent office on 1972-01-11 for surface cleaning apparatus.
This patent grant is currently assigned to Aktiebolaget Electrolux. Invention is credited to Bengt Olog Crener, Stig Carl-Oskar Ernolf.
United States Patent |
3,633,240 |
Crener , et al. |
January 11, 1972 |
SURFACE CLEANING APPARATUS
Abstract
Our invention relates to surface-cleaning apparatus having a
housing which is adapted to hold a body of liquid that generates
foam when air bubbles therethrough. A surface-contacting member,
which is carried by the housing and is movable over a surface,
functions to distribute foam. Air under pressure is delivered from
a source of supply to the inlet of an air line which is located
exteriorly of the housing. The outlet of the air line is located
within the housing at its bottom and connected to a device to form
air bubbles which rise through the body of liquid to generate foam.
Foam is conducted through a passageway from the upper part of the
housing to the surface-contacting member. A conventional household
suction cleaner can be conveniently used as the source of supply of
air under pressure. In order to generate foam in the apparatus
which is relatively dry and not excessively moist, the air inlet
end of the air line is connected to the blowing end of suction
cleaner by a coupling which may be referred to as a bypass valve
and functions to divert and bleed to the atmosphere a major portion
of the air discharged from the blowing end of the suction cleaner.
In this way the rate at which air under pressure is delivered to
the bottom of the housing through the air line will be correct to
generate foam that is relatively dry.
Inventors: |
Crener; Bengt Olog (Taby,
SW), Ernolf; Stig Carl-Oskar (Sollentuna,
SW) |
Assignee: |
Aktiebolaget Electrolux
(Stockholm, SW)
|
Family
ID: |
20259173 |
Appl.
No.: |
05/010,763 |
Filed: |
February 12, 1970 |
Foreign Application Priority Data
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Feb 13, 1969 [SW] |
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1973/1969 |
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Current U.S.
Class: |
15/321; 15/323;
15/339 |
Current CPC
Class: |
A47L
11/4044 (20130101); A47L 11/4094 (20130101); A47L
11/408 (20130101); A47L 11/4083 (20130101); A47L
11/4036 (20130101); A47L 11/34 (20130101); A47L
9/02 (20130101); A47L 11/4041 (20130101); A47L
11/325 (20130101) |
Current International
Class: |
A47L
11/00 (20060101); A47L 11/32 (20060101); A47L
11/34 (20060101); A47L 9/02 (20060101); A47l
011/34 () |
Field of
Search: |
;15/320,321,339,50,51,52,98,322,323,366,384 |
References Cited
[Referenced By]
U.S. Patent Documents
Other References
German Printed Appl. 1208458, W. Appel, 15-321, 1-1966 .
German Printed Appl. 1207564, G. Konig, 15-321, 12-1965.
|
Primary Examiner: Scheel; Walter A.
Assistant Examiner: Moore; C. K.
Claims
We claim:
1. Surface-cleaning apparatus comprising
a. a source of supply of air under pressure comprising a movable
tank-type suction cleaner having an inlet and outlet for air, the
outlet serving as the blowing end of said cleaner,
b. structure providing a housing adapted to hold a body of cleaning
liquid possessing such physical properties that it will generate
foam responsive to air bubbling therethrough,
c. surface contacting means which is carried by said housing
structure and movable over a surface for distributing foam
thereon,
d. an air line having an air inlet exteriorly of said housing and
an air outlet within said housing at the bottom thereof,
e. means including a bypass valve for conducting air under pressure
from the outlet of said cleaner to the inlet of said air line,
f. means at the outlet of said air line for subdividing the air
under pressure to form air bubbles which rise through the body of
liquid to generate foam,
g. vertically extending conduit means defining a passageway having
its upper end in communication with the upper part of said housing
and its opposite lower end communicating with said surface
contacting means for flowing thereto foam from the upper part of
said housing,
h. the inlet of said air line being connected to said bypass
valve,
i. said bypass valve having one passageway which receives a major
portion of the air discharged from the suction cleaner outlet and
diverts such air to the atmosphere and another passageway which
receives the lesser remaining portion of the air discharged from
the suction cleaner outlet and conducts such air to said air
line,
j. a valve in said air line,
k. said valve including means defining a seat and a valve movable
between a closed position at said seat and an open position removed
therefrom, and
l. said valve being in its open position when air under pressure is
delivered to the inlet of said air line from the outlet of said
suction cleaner, and, when the inlet of said suction cleaner
inadvertently is connected to the inlet of said air supply line,
said valve moving to its closed position responsive to flow of air
in said air line toward the inlet end thereof.
2. Surface-cleaning apparatus comprising
a. structure providing a housing adapted to hold a body of cleaning
liquid possessing such physical properties that it will generate
foam responsive to air bubbling therethrough,
b. surface contacting means which carried by said housing structure
and movable over a surface for distributing foam thereon,
c. an air line having an air inlet exteriorly of said housing and
an air outlet within said housing at the bottom thereof,
d. means connected to the inlet of said air line for delivering
thereto air under pressure from a source of supply,
e. means at the outlet of said air line for subdividing the air
under pressure to form air bubbles which rise through the body of
liquid to generate foam,
f. vertically extending conduit means defining a passageway having
a region at its upper end in communication with the upper part of
said housing and its opposite lower end communicating with said
surface contacting means for flowing thereto foam from the upper
part of said housing,
g. means associated with said air line for diverting and bleeding
therefrom a portion of the air adapted to be supplied thereto under
pressure from the source of supply,
h. said vertically extending conduit means including an enlarged
portion at its upper end which defines a vessel having a top cover
and a sidewall which is apertured and constitutes said region in
communication with the upper part of said housing, and
i. a member of annular form within said vessel which is adjacent to
said sidewall thereof, said member being vertically movable within
said vessel between first and second positions, said member being
in said first position removed from said apertured region of said
sidewall when the apparatus is in a normal upright position and in
said second position at said apertured region to cover the latter
when the apparatus is in an inverted position.
3. The combination of
a. a source of supply of air under pressure comprising a movable
tank-type suction cleaner having an inlet and outlet for air, the
outlet serving as the blowing end of said cleaner,
b. structure providing a housing adapted to hold a body of cleaning
liquid possessing such physical properties that it will generate
foam responsive to air bubbling therethrough,
c. surface contacting means which is carried by said housing
structure and movable over a surface for distributing foam
thereon,
d. an air line having an air inlet exteriorly of said housing and
an air outlet within said housing at the bottom thereof,
e. means including a coupling for conducting air under pressure
from the outlet of said cleaner to the inlet of said air line, such
air being substantially free of dust removed therefrom in said
suction cleaner,
f. means at the outlet of said air line for subdividing the
substantially dust-free air under pressure to form air bubbles
which rise through the body of liquid to generate foam,
g. vertically extending conduit means defining a passageway having
its upper end in communication with the upper part of said housing
and its opposite lower end communicating with said surface
contacting means for flowing thereto foam from the upper part of
said housing,
h. means forming a unitary part of said coupling for mounting the
latter on said cleaner at the air outlet end thereof,
i. said coupling constituting an independently movable component of
the combination and being hollow and having an outer wall,
j. said coupling having partition means including an axially
extending partition to form first and second passageways at
opposite sides thereof, each of said passageways being defined by
the outer wall of said coupling and said partition means and having
an inlet at the end of said coupling connected to the air outlet of
said cleaner,
k. the cross-sectional area of said first passageway being greater
than that of said second passageway and receiving a major portion
of the air discharged from the outlet of said cleaner,
l. said first passageway in said coupling having an outlet for
discharging said major portion of the air therefrom directly to the
body of atmospheric air enveloping said coupling, and
m. said second passageway in said coupling having an outlet, the
inlet of said air line being connected to the outlet of said second
passageway to receive the lesser remaining portion of the air
discharged from the outlet of said cleaner.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to surface-cleaning apparatus in which foam
is generated in a body of cleaning liquid by bubbling air
therethrough, the foam being conducted from a space above the
liquid surface level of the liquid body to a surface contacting
member which is movable over a surface and functions to distribute
the foam.
2. Description of the Prior Art
In known surface-cleaning apparatus air bubbles to generate foam in
a body of liquid are formed from a stream of air supplied under
pressure from a conventional household suction cleaner. With this
arrangement foam is generated very rapidly which causes liquid to
be carried away with the foam. This is objectionable because the
generated foam is extremely moist. After such foam has been
distributed on a surface like a rug, for example, the rug becomes
wet which is not desirable. This means that the length of time for
the rug to dry becomes longer which in turn increases the overall
length of time to perform the entire cleaning process. Also, the
final cleaning result is impaired when cleaning is effected with
foam that is excessively moist.
Filters have been employed to remove moisture from foam passing
therethrough. While this way of removing moisture from foam has
been successful to a certain degree, this means that additional
expense is encountered by providing filters in the surface-cleaning
apparatus.
SUMMARY OF THE INVENTION
It is an object of our invention to provide an improved surface
cleaning apparatus for producing foam that is relatively dry and
not excessively moist. We accomplish this by forming air bubbles in
the bottom of a body of liquid from a stream of air under pressure
which is delivered thereto through an air line having its inlet end
connected to a source of supply of air under pressure and
regulating the quantity of air supplied through the air line to
prevent liquid being carried away with the foam so that it will not
be excessively moist. When a conventional household suction cleaner
is employed as the source of supply of air under pressure, the
quantity of air supplied through the supply line can be regulated
by employing a coupling to connect the air inlet end of the air
line to the blowing end of the suction cleaner. Such coupling,
which may be referred to as a bypass valve, functions to divert and
bleed to the atmosphere a major portion of the air that otherwise
would flow from the blowing end of the suction cleaner through the
air line.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective view of surface cleaning apparatus which
embodies our invention and a suction cleaner for supplying air
under pressure thereto;
FIG. 2 is a vertical sectional view of the apparatus shown in FIG.
1;
FIG. 3 is an enlarged fragmentary sectional view of details
illustrated in FIG. 2;
FIG. 4 is a sectional view taken at line 4--4 of FIG. 2;
FIG. 5 is a front elevational view of parts shown in FIGS. 1 and
2;
FIG. 6 is a top plan view of the parts shown in FIGS. 1, 2 and
5;
FIG. 7 is a perspective view of a portable storage receptacle and
filling stand for the apparatus seen in FIGS. 1 and 2; and
FIG. 8 is a view, partly in section, illustrating the manner in
which the apparatus of FIGS. 1 and 2 is positioned in the
receptacle and stand of FIG. 7.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1, the surface cleaning unit comprises surface
cleaning apparatus 10, a flexible hose 11 for supplying air under
pressure to the apparatus 10, and a suction cleaner 12 which serves
as a source of supply of air delivered under pressure to the hose
11. The suction cleaner 12 includes a casing 12a having an end
cover 13f provided with an outlet 13g to which the hose 11 is
adapted to be removably secured by a coupling 13. Air is drawn into
the casing 12a through an inlet, which is at the end of the casing
opposite the end cover 13f, by a suitable motor fan unit (not
shown) disposed therein. Air discharged under pressure from the
outlet 13g serves as a source of supply of air under pressure for
the surface cleaning apparatus 10.
In FIGS. 1 to 6 of the drawing, the invention has been shown in
connection with surface cleaning apparatus 10 which comprises an
elongated multisided housing 10a which, as illustrated, is
triangular in cross section and includes a large bottom section 10b
and a smaller top section 10c. An opening 15 adapted to be closed
by a cap 15a is provided at the top of the large bottom section 10b
of the housing 10. The housing 10 is adapted to be filled at the
opening 15 with a suitable cleaning agent capable of generating
foam when air bubbles therethrough, as will be explained
presently.
When the housing 10 is viewed with its longitudinal axis in a
vertical or upright position, it will be seen that the bottom and
sidewall thereof are connected by a flat wall section 10d which, in
a true sense, forms a part of the sidewall of the housing. However,
when the housing 10a is in its inclined operating position seen in
FIG. 2 the flat wall section 10d constitutes the lowest part of the
housing for a useful purpose which will be described presently.
The housing 10a at its upper end is provided with an opening 10e
which is closed by a cap or cover 10f threadedly connected thereto.
The apparatus 10 is provided with a handle 9 which is connected to
the cover 10f by a coupling 9a. The handle 9 is hollow and
connected to the hose 11 to receive air under pressure from the
suction cleaner 12. An opening 28 is provided in the wall of the
handle for a purpose to be described hereinafter.
An open top vessel 18 is fixed within the upper part of the housing
10a by the cover 10f. A second smaller open top vessel 8 nests
within the vessel 18 and forms a cover therefor, the second vessel
also being fixed within the upper part of the housing 10a by the
cover 10f. The second vessel 8 defines a chamber 8a which receives
air under pressure from the hollow handle 9. Such air flows from
chamber 8a through a conduit 7 which extends downward within the
housing 10a to the flat wall section 10d at the bottom thereof. The
lower end of the conduit 7 is connected to a nozzle 14 having a
plurality of small openings to subdivide the air discharged
therethrough which then bubbles upward through the body 6 of
cleaning agent in the bottom half of the housing 10a.
The air bubbling upward in the body 6 of cleaning agent generates
foam which is forced upward in the upper part of the housing 10a
above the liquid level therein. The foam is forced through openings
17 in the sidewall of the vessel 18 into the interior 18a thereof
and passes downward therefrom through a bottom opening 18b into the
upper end of a conduit 16 which is disposed within the housing 10a.
The lower open end of the conduit 16 is connected to the bottom of
the housing 10a at an opening therein which defines a passageway
16a for discharging the foam into a chamber 5 formed at the
underside of a base 4 by a wall part thereof and a plate 4a fixed
thereto.
An elongated hollow roller or surface contacting member 23 is
journaled at 23a to the sidewall of the base 4 and provided with
spaced ridges 26 which extend lengthwise thereof and are of spiral
form. The plate 4a extends over the roller 23 and is provided with
openings 4b through which foam can pass from the chamber 5 onto the
peripheral surface of the roller.
Elongated brushes 24 and 25 are fixed to the base 4 at opposite
sides of the roller 23. The tips of bristles 24a and 25a of the
brushes are adapted to frictionally engage a surface 3 being
cleaned, such as a carpet, for example, at the same time the roller
23 is being moved back and forth by the handle 9 over the surface
in physical contact therewith.
In accordance with our invention, in order to generate foam in the
surface cleaning apparatus 10 which is relatively dry and not
excessively moist, the coupling device 13, which may be referred to
as a bypass valve, is so constructed and formed that all of the air
under pressure is not delivered from the suction cleaner 12 to the
cleaning apparatus. We accomplish this by providing a partition 13a
in the coupling device to form first and second passageways 13b and
13c into which air is discharged from the suction cleaner.
Air discharged into the first passageway 13b flows therefrom
through the hose 11 to the hollow handle 9. Air discharged into the
passageway 13c flows through openings 13d in the coupling 13 to the
ambient air. In a broad sense a major portion of the air discharged
from the suction cleaner is bled from the main airstream and vented
directly to the body of atmospheric air enveloping the coupling 13.
In accord with our invention, therefore, we only make use of a
small portion of the airstream that is necessary to generate foam
that is relatively dry not excessively moist.
The opening 28 in the hollow handle 9 provides a convenient
arrangement for controlling the operation of the surface cleaning
apparatus 10. When it is desired to operate the apparatus 10 an
operator holding the manipulating handle 9 simply places a finger
over the opening 28 whereby air under pressure can then flow
through conduit 7 to the nozzle 14. When the opening 28 is not
closed, air under pressure is discharged therethrough to the
atmosphere because the body 6 of liquid cleaning agent in the
housing 10a offers greater resistance to air flowing thereto than
the resistance offered to flow of air at the opening 28.
By providing the flat portion 10d at the bottom part 10c of the
housing 10a and locating the nozzle 14 closely adjacent to this
flat portion, air bubbles will pass through the entire mass of the
liquid body 6 and it will be effectively used to generate foam.
Since the opening 15 for introducing liquid cleaning agent into the
housing 10a is about midway between the top and bottom thereof, the
liquid surface level 6a of the liquid body 6 can never be above the
opening 15. This means that the foam generated in the housing 10a
must rise therein above the liquid surface level 6a through a
vertical height which is approximately one-half the height of the
housing.
The foam, which slowly rises in the housing 10a due to the slight
positive pressure therein, in this way is subjected to a drying
action in the housing. This drying action, in addition to supplying
air under pressure at such a rate that the foam generated will be
relatively dry and not excessively moist, results in supplying to
the surface being cleaned foam which is practically dry. The foam
passing from the chamber 5 and openings 4b onto the roller 23 is
effectively distributed on the surface 3 by the back and forth
movement imparted to the roller 23.
Additional advantages are realized by employing the coupling 13 to
connect the blowing end of the suction cleaner 12 and the hose 11.
Even when the hose 11 has a sharp bend and more or less obstructs
the flow of air therethrough, the major portion of the main
airstream diverted through the openings 13d to the atmosphere will
prevent complete blocking of the flow of air through the suction
cleaner 12, so that overloading of the motor fan unit and
objectionable overheating of the motor will be avoided. Further,
the collar 13e at the air inlet end of the coupling 13 forms a
unitary part thereof for mounting the coupling at the air outlet or
blowing end 13g of the cleaner 12. The coupling 13, which
constitutes an independently movable component of the surface
cleaning apparatus, is hollow and has an outer wall. Each of the
passageways 13b and 13c is defined by the outer wall of the
coupling and the axially extending partition 13a and has an air
inlet at the end 13e of the coupling connected to the air outlet
13g of the cleaner. Since the suction cleaner 12 is of a
conventional type having a dust collecting receptacle therein the
air discharged from the outlet 13g will be substantially free of
dust. Hence, the air supplied through the air inlet line 11 to the
housing 10 will be substantially clean air.
A sleeve 19 of annular form is movable axially within the interior
18a of the vessel 18. When the surface cleaning apparatus 10 is
upright, as shown in FIG. 2, the sleeve 19 is at the bottom of the
vessel 18 and the openings 17 are not closed. If the apparatus 10
should be inverted the sleeve 19 will move axially of the vessel 18
and close the openings 17. Further, the top and bottom parts 10b
and 10c of the housing 10 are of such shape and size that, when the
apparatus 10 is placed on its side, the liquid surface level of the
liquid body 6 will be below all of the openings 17. In this way
liquid cannot flow through the tubing 16, passageway 16a, chamber 5
and openings 4a to cause objectionable wetting of the surface being
cleaned.
In the event the coupling 13 is connected to the suction inlet of
the suction cleaner instead of the outlet 13g at the blowing end of
the cleaner, the suction effect produced in the hose 11 cannot be
transmitted to the body 6 of cleaning liquid in the housing 10a. As
seen in FIGS. 2 and 3, a flexible diaphragm 20 having an aperture
20a is fixed within the cover 10f. When air under pressure normally
is supplied through the hose 11 to the housing 10a, the opening 28
being closed by the operator's finger, the diaphragm 20 assumes the
position shown in FIG. 3 and air can flow through the aperture 20a
which is open. However, the diaphragm 20 will flex toward a wall
part 10g within the cover 10f and close the aperture 20a when the
opening 28 is closed by the operator's finger and the diaphragm is
subjected to suction. Hence, liquid can never be sucked from the
housing 10a and flow to the suction cleaner 12 when the coupling
inadvertently is connected to the suction inlet of the cleaner.
Further, one or more devices 21 and 22 can be employed to produce
high pitch sounds which will warn an operator that the hose 11 of
the surface cleaning apparatus 10 has not been connected to the
blowing outlet 13b of the suction cleaner 12. The warning device 21
comprises a thin reedlike flexible member 21a held between an
apertured disk 21b and apertured plug 21c in the cover or cap 10f
of the housing 10a. The reedlike member 21a is provided with a very
small opening (not shown). When the diaphragm 20 flexes to close
the opening 20a with the hose 11 inadvertently connected to the
suction inlet of the cleaner 12 and the opening 28 is closed by the
operator's finger, the reedlike member 21a will be subjected to the
full suction effect of the cleaner and air sucked inward through
the very small opening therein will cause the member 21a to vibrate
and produce an audible sound and serve as a warning signal.
During normal operation of the surface cleaning apparatus 10, when
the diaphragm 20 is in the position shown in FIG. 3 and the opening
28 is closed by the operator's finger, the air flowing past the
reedlike member 21a will not cause the latter to produce an audible
sound. This is so because the member 21a under these conditions is
located for all practical purposes in a dead end space through
which there is no rapid movement of air.
The warning device 22 comprises a U-shaped cup 22a provided in the
end of the handle 9. The bottom of the cup is formed with an
opening through which extends a neck portion 22b of a part 22c
disposed in the cup 22a. A disk 22d is fixed to the outer extremity
of the neck portion 22b. During normal operation of the
surface-cleaning apparatus 10 when air under pressure is delivered
to the hollow handle 9 and the opening 28 is closed by the
operator's finger, the disk 22d is forced toward the opening at the
bottom of the cup 22a and closes the latter. However, when the hose
11 inadvertently is connected to the suction inlet of the cleaner
and the opening 28 is closed by the operator's finger, the suction
effect will cause the disk 22d to move toward the opening 28 and
uncover the opening in the bottom of the cup 22a whereby air
passing therethrough will produce an audible sound.
A portable storage receptacle 27 is illustrated in FIG. 7 in which
the surface-cleaning apparatus 10 can be stored in the manner shown
in FIG. 8. The receptacle 27 is provided with compartments 27a and
27b to receive the hose 11 and a bottle 27c adapted to hold
cleaning liquid. In FIG. 8 it will be seen that the receptacle 27
can also serve as a stand to hold the surface cleaning apparatus 10
in the correct vertical position when filling the housing 10a with
cleaning liquid.
* * * * *