U.S. patent number 3,875,605 [Application Number 05/384,851] was granted by the patent office on 1975-04-08 for rug shampooer.
This patent grant is currently assigned to General Signal Corporation. Invention is credited to Richard M. Fegan.
United States Patent |
3,875,605 |
Fegan |
April 8, 1975 |
Rug shampooer
Abstract
A rug shampooing machine, including means for producing dry foam
from a liquid detergent source and for working such foam into a rug
or carpet by means of a brush rotating on a horizontal axis;
further comprising a vacuum nozzle, roller and squeegee means for
picking up the dirty solution resulting from the scrubbing or
shampooing action. A foam generator mechanism is especially adapted
to produce the aforesaid foam from the detergent source. This
mechanism includes two rollers situated above the scrubbing brush,
just below the outlet from the detergent source. The axes of the
rollers are in a substantially horizontal plane and parallel to the
surface to be cleaned. The rollers are of different diameters, the
larger of the two being a foam plastic roller, which is driven by a
belt connected to the scrubbing brush. The two rollers are
continuously compressed together in order to create the desired
foam. A reverse-stroke brush lift-off mechanism is also
incorporated in the rug-shampooing machine. The scrubbing brush,
being in contact with the surface to be cleaned, is active in
propelling the machine forwardly and is effective in working the
foam detergent into the rug. However, on the return stroke, which
is a natural stroke that the user would tend to indulge in because
it has become a habit in the use of conventional vacuum cleaners,
the rotation of the brush would act to interfere with easy return
movement. Accordingly, as the user pulls the machine backwardly,
the brush is lifted by means of a reaction principle involving very
little force.
Inventors: |
Fegan; Richard M. (Flemington,
NJ) |
Assignee: |
General Signal Corporation
(Rochester, NY)
|
Family
ID: |
27010788 |
Appl.
No.: |
05/384,851 |
Filed: |
August 1, 1973 |
Current U.S.
Class: |
15/50.3; 15/356;
15/320 |
Current CPC
Class: |
A47L
11/4061 (20130101); A47L 11/4041 (20130101); A47L
11/4075 (20130101); A47L 11/325 (20130101); A47L
11/4055 (20130101) |
Current International
Class: |
A47L
11/00 (20060101); A47L 11/40 (20060101); A47L
11/34 (20060101); A47l 011/34 () |
Field of
Search: |
;15/24,29,5R,5C,98,320,321 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Roberts; Edward L.
Attorney, Agent or Firm: Kleinman; Milton E. Wynn; Harold S.
Ohlandt; John
Claims
What is claimed is:
1. A rug shampooing machine comprising:
a. a motor;
b. a brush rotatably driven on a horizontal axis by said motor,
said brush being adapted to contact a surface to be cleaned and to
propel said machine forwardly;
c. a foam generator mechanism including:
1. a housing situated above said horizontal axis for containing a
liquid detergent;
2. first and second rollers having their axes substantially
parallel to said horizontal axis and with said first roller having
an outer surface comprising a resiliently deformable foam
plastic;
3. said first and second rollers positioned for contact so that
said second roller deforms the outer surface of said first
roller;
4. one of said first and second rollers coupled to said motor for
rotational driving thereof and frictional driving of the other
roller; and
5. said first roller having at least a portion of its deformable
surface in contact with said liquid detergent in said housing so as
to pick up and aerate the liquid detergent and thereby generate
foam in response to the rotation of said first and second rollers
and the concomitant deformation of the deformable surface of said
first roller; and
d. a series of openings in said housing for depositing foam
produced by said foam generator mechanism on top of said brush so
that foam is carried forward to the surface to be cleaned in
response to the rotation of said brush.
2. A machine as defined in claim 1 wherein the coupling between one
of said rollers and said motor comprises a driving connection
between said brush and said one roller.
3. A machine as defined in claim 1, further comprising a well or
reservoir in the bottom wall of the foam generator housing for
retaining liquid detergent.
4. A machine as defined in claim 3, in which at least a portion of
said one roller is in contact with the liquid detergent in said
well.
5. A machine as defined in claim 1 further comprising:
a roller for supporting the front of said machine, including means
for automatically moving said roller downwardly, with respect to
the axis of said brush, in response to translational movement
rearwardly of the handle of said machine, so as to lift said
brush.
6. A machine as defined in claim 5 in which said last-named means
includes a linkage system comprising a bell crank, one of the arms
of said bell crank carrying said support roller.
Description
BACKGROUND, OBJECTS, AND SUMMARY OF THE INVENTION
The present invention relates to a rug shampooing machine and
especially to a rug shampooer which uniquely and efficiently
provides for cleaning of rugs and the like with a prefoamed
detergent.
A VARIETY OF DEVICES OF MACHINES FOR HOME USE IN SCRUBBING AND
POLISHING FLOORS, AND ALSO IN SCRUBBING OR SHAMPOOING RUGS AND
CARPETS, HAS DEVELOPED OVER THE PAST DECADE OR SO. The resultant
mass production effort attendant these developments has brought
about sharp decreases in the cost of the units; hence, they have
found a widespread market compared with the commercial units that
were available 10 years ago.
A fundamental approach that has been taken in the design of
machines for rug cleaning is to provide a unit that is eminently
suited to produce the required scrubbing action for cleaning the
rug or carpet and at the same time includes a means for vacuuming
the dirty water resulting from the scrubbing action. An example of
a rug shampooer which provides this assembly of functions is
described in U.S. Pat. No. 3,392,418.
It has become an object of the machine described in the aforesaid
patent, as well as other machines known in the prior art, to
minimize the wetting of the rug in the scrubbing or shampooing
operation and thereby to promote efficient cleaning thereof.
Accordingly, it becomes necessary to create a foam from the liquid
detergent before depositing the detergent on to the rug. It is
noteworthy that a properly prepared foam made from a liquid
detergent is far less expensive and more effective than dry,
powdered materials, which have sometimes been sprinkled on the
rug.
It is therefore a fundamental object of the present invention to
provide a compact, efficient and economical rug shampooing
machine.
A more specific object of the present invention is to provide an
efficient foam generating mechanism.
Another object is to provide such a foam generating mechanism so as
to avoid the complications entailed when a source of air must be
supplied to a manifold in creating such foam.
A primary feature of the present invention resides in the
arrangement of a simplified foam generating mechanism which
includes two rollers situated above the scrubbing brush just below
a detergent source outlet. The two rollers are continuously
compressed together in order to create the foam. More specifically,
the axes of these rollers are in a substantially horizontal plane
and parallel to the surface to be cleaned. The rollers are of
different diameters, the larger of the two being a foam plastic
roller, which is driven by a belt connected to the scrubbing
brush.
Since it is a well known fact that the user of a typical vacuum
cleaner device has become accustomed to a forward and reverse
stroke, that is to a back and forth movement of the cleaning
device, the rug shampooer of the present invention has been
designed with this in mind.
Accordingly, it is another major object of the present invention to
make the rug shampooing machine operation conform closely to the
conventional operation of cleaning devices which are operated by
the user with a back and forth movement. In other words, it has
been recognized as extremely efficacious to provide a rug
shampooing machine which conforms as closely as possible to this
preconditioned mode of operation. However it becomes desirable, as
will be apparent, that the scrubbing action on the carpet or rug
will take place only during the forward stroke or forward movement
of the machine and not during the return stroke.
It is therefore another object of the present invention to provide
a mechanism which will produce lift-off of the brush from the
surface to be cleaned when the machine is in its reverse stroke or
backward movement.
Yet another object is to incorporate the lift-off mechanism such
that it automatically operates on the return stroke to lift off the
brush.
The above cited objects and purposes relating to brush lift-off are
accomplished by the mechanism of the present invention which works
upon a reaction principle and involves very little force in the
operation. In effect, there is no conscious manipulation of any
part by the operator in order to bring about the brush lift-off.
Rather, by simply pulling the machine backwardly, which is an
accustomed action, the reaction principle is effectuated.
Specifically, the brush lift-off mechanism comprises a linkage
system connected to the handle and suitably pivoted to the base or
housing of the rug shampooing machine such that the inertia of the
machine on the rug creates enough reaction to operate the linkage
with no effect on the operator. Moreover, when the return stroke is
finished the brush, and concomittantly if desired, the vacuum
pick-up, are automatically dropped down and assume their original
positions.
Further objects, features and advantages of the present invention
will be appreciated as the description of the invention in the
following specification proceeds, such description being taken in
connection with the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a perspective view of a rug shampooer embodying the
concepts of the present invention.
FIG. 2 is a vertical sectional view taken on the line 2--2 of FIG.
1.
FIG. 3 is a vertical sectional view taken on the line 3--3 of FIG.
2.
FIG. 4 is a fragmentary view of the rear of the rug shampooer,
illustrating a mechanism for adjusting the height of the rear of
the machine from the surface to be cleaned.
FIG. 5 is a diagrammatic view illustrating the brush lift-off
mechanism of the present invention, the different positions in the
operation of the mechanism, as well as the affected parts, being
shown in full and in dotted lines.
FIG. 6 is a fragmentary plan view illustrating the foam generator
mechanism of the present invention.
FIG. 7 is a sectional view taken on the line 7--7 of FIG. 6,
particularly illustrating the relationship between the foam
generator mechanism and the cleaning brush of the rug
shampooer.
FIG. 8 is a fragmentary view illustrating the drive for the brush
and foam generator mechanism.
FIG. 9 is a vertical section taken on the line 9--9 of FIG. 8.
DESCRIPTION OF PREFERRED EMBODIMENT
Referring now to the drawing and particularly to FIG. 1 thereof, a
rug shampooer embodying the concepts of the present invention is
illustrated. The rug shampooer comprises a base or lower housing 10
and a handle 12. Mounted on the handle are an upper dispensing tank
or container 14 for dispensing liquid detergent and a lower tank 16
for storing the dirty solution as it is vacuumed from the surface
being cleaned. At the upper end of the handle 12, there is provided
a valve actuating device 18 for controlling the dispensing of the
liquid deterent from tank 14. A conventional power cord 20 is
provided for supplying power to the shampooer, and a suction hose
22 will be seen at the rear of the machine for conveying the dirty
solution to the tank 16.
The lower housing or base 10 is made up of a dish-shaped frame 24
and a cover 26 (see especially FIG. 2). The handle is suitably
bifurcated as it extends downwardly to define the yoke members 28,
such yoke members being connected in a manner hereinafter
described.
At the rear of the housing 10 there will be seen a mechanism 30 for
adjusting the height of the housing 10 above the surface to be
cleaned, thereby to affect the elevation of the brush and nozzle of
the rug shampooer with respect to that surface. Such mechanism per
se is conventional in the art and includes a ratchet-escapement 32
and a pivotable bracket 34 which carries a wheel 36. A
corresponding wheel 36 is located at the other side of the machine.
The pivotable bracket 34 is provided with ratchet teeth 40 which
cooperate with similar teeth 42 on a pawl 44 carried by a spring
biased rod 46. The bracket 34 is adapted to be pivoted about the
pin 48. An integral lever 50 on the bracket is used to raise the
rear end of the machine in steps, as is well known, while the rod
46 functions to lower it in corresponding steps, such being
accomplished by the respective lowering and raising of the two
wheels 36 in response to actuation of the aforesaid lever and
rod.
Within the housing 10, there is mounted a motor 60, the drive shaft
62 of which carries and rotates a vacuum fan 64, seen on the right
in FIG. 3, and a motor-cooling blower 66, seen on the left in the
same figure. The shaft 62 is also effective to drive a pulley 70,
also on the left, which in turn drives belt 72, thereby to drive a
cleaning brush 74 by way of pulley 76 fixed to shaft 78 (FIG.
8).
The cleaning brush 74 extends transversely with respect to the
front of the machine and is suitably journaled in bushings 80 and
82 at opposite sides thereof. A shroud 84 surrounds and partially
encloses the cleaning brush 74. It will be noted that the brush
consists of a core roller 86, typically constructed of stainless
steel or the like, on which are mounted bristles 88.
In accordance with a primary feature of the present invention, a
foam generator mechanism 90 is judiciously arranged and disposed in
cooperative relationship with the cleaning brush 74. This mechanism
is capable of producing abundant quantities of dry foam in an
efficient manner. As can be especially appreciated by reference to
FIG. 7, the foam generator mechanism is located immediately above
the cleaning brush 74 in a housing 92; the housing being especially
constructed so that a reservoir or well 94 for liquid detergent is
provided in its lower wall. Such detergent is supplied from the
dispensing tank 14 by operation of the actuating device 18 which
affects a valve in a conventional manner to produce flow of
detergent from the tank 14. The detergent is transmitted by means
of the hose 96 at the rear of the foam generator mechanism, such
hose being fitted over a nipple 98. The nipple in turn is connected
to a distribution pipe 100 which extends transversely of the foam
generator housing 92 (FIG. 6), the pipe 100 having a series of
apertures 101 spaced along its transverse extent.
It will be seen that the foam generator includes a pair of
rotatable rollers 102 and 104. The roller 102 is of solid steel
construction, whereas the roller 104 consists of a core 106 of
stainless steel or the like on which is mounted a foam plastic
cover 108. It will be seen that the axes of the rollers 102 and 104
are in a substantially horizontal plane and parallel to the surface
to be cleaned. The roller 104 has a much larger outside diameter
than has roller 102, it having been found that this is an extremely
efficient construction for the rollers. The cover 108 is preferably
constituted of a foam plastic material such as polyurethane which
is adaptable to be readily flexed when the peripheries of the
rollers 102 and 104 are brought into pressure contact.
The roller 104 is affixed to a shaft 110 which is journaled in the
bearings 112 at the end of the housing 92. The shaft 110 extends
beyond the housing and is fitted with a pulley 114. The shaft 78
which supports the brush core 86 is fitted with a pulley 116, and a
driving connection between the two pulleys 114 and 116 is
established by means of a belt 118. It will thus be appreciated
that the driving connection between the motor 60 and the brush 74
by way of the appropriate pulleys and belt, will also serve to
transmit movement to the foam plastic roller 104.
It will be apparent, especially by reference to FIG. 6-9, that
liquid detergent stored in the dispensing tank 14 is fed to the
foam generator mechanism 90 via the tubing 96 and the nipple or
pipe 98. The liquid detergent is discharged into the foam generator
mechanism through the apertures 101 in the distribution tube or
pipe 100 so that the liquid detergent becomes evenly distributed
along the transverse extent of the housing.
It will be seen, by reference to FIG. 7, that as a result of the
well 94 formed in the lower wall of the housing 92 of the foam
generator mechanism, the incoming liquid detergent will collect
therein and thence be taken up by the foam roller 104. It will also
be seen that the foam roller 104 is in constant peripheral flexing
contact with the rigid roller 102 and hence that this flexing
action of the foam plastic material of the roller 104 will serve to
aerate the detergent and generate the required dry foam. An
opening, or series of openings 120, is provided at the front of the
housing 92.
It will be understood that in the operation of the foam generator
mechanism it is preferable that the amount of liquid detergent
permitted to flow down into the housing of the foam generator 90 be
regulated such that the liquid detergent just fills the well 94.
However, such an objective is not critical and the detergent can be
permitted to rise to a somewhat higher point.
It will be apparent from the preceding description that, upon
energization of the rug shampooer, the brush 74, because of
suitable reduction gearing, will rotate slowly in the clockwise
direction as viewed in FIG. 7. The plastic foam roller 104 is
likewise driven in a clockwise direction because of the belt
connection 118. The dry foam, which has been generated by the
aforenoted flexing action of the foam plastic roller 104 against
the steel roller 102, is efficiently moved forwardly and down
through the openings 120 whence it falls onto the bristles of the
brush 74 and is thereby carried by the bristles so as to be
deposited on the rug being cleaned. Since the brush 74 acts to
propel the machine forwardly the aerated, essentially dry, foam is
deposited on successive areas of the rug and is worked into the nap
of the rug. The detergent foam of course acts to pick up the dirt
in the rug as a result of the thorough scrubbing of a given area.
The foam with the entrained or collected dirt is then removed from
the rug or other surface. This is accomplished by a vacuuming and
squeegeeing operation to be described.
Vacuuming of the dirty foam is achieved by apparatus including
nozzle 130, which is of conventional construction and extends
transversely to the direction of movement of the machine, being
provided with an upper outlet 132 that communicates with suction
hose 134 (FIG. 3), the upper end of which is connected to vacuum
fan 64.
The vacuum cleaning operation is performed both in the forward
stroke and reverse stroke directions. As a result of the placement
of the nozzle 130, it is effective to pick up the foam resulting
from the scrubbing operation. Also, a squeegee assembly 140 is
associated with the nozzle 130. This squeegee assembly, which can
be removed as desired, is preferably floatably mounted to the frame
24 and is spring biased to permit it to conform to minor variations
in the contour of the particular rug being scrubbed as well as to
various settings of the height adjustment mechanism 30. The
assembly includes two wipers 142 and 144 which extend transversely,
roughtly to the same extent as the forward roller to be described.
Variable adjustment with respect to the two directions of movement
of the machine can be accommodated by mounting the squeegee
assembly in such a way that the assembly floats upwardly and offers
little resistance during the forward stroke, but the squeegee
assembly is pushed downwardly onto a floor during a reverse stroke
motion, at that time providing an increased squeezing action so as
to remove dirty foam.
The reverse stroke mechanism for providing lift off of the brush 74
in response to backward movement of the rug shampooer may best be
appreciated by reference to FIG. 5 of the drawing. This view is
diagrammatic with certain parts not shown for clarity of
illustration. It will be seen that the rear wheels 36 are
relatively conventionally mounted. That is, they can be raised or
lowered by the height adjustment mechanism 30. However, it is at
the forward end of the machine that the mechanism of the present
invention is mainly operative. Thus, there will be seen a front
roller 150 which is so arranged that it can be placed in two
significantly different operative positions by dint of the
operation of a linkage system generally designated 152. The normal
position, that is to say, the position of the roller and linkage
which corresponds to forward movement or to the forward stroke for
the machine, is shown by phantom lines. The brush 74 is also shown
in its normal position by means of phantom lines.
The linkage system 152 comprises a bell crank 154 having an arm 156
secured to a shaft 158 which is fixed in the frame 24. Another arm
160 is likewise secured to the shaft 158. It will be understood
that corresponding structure is provided at the opposite side of
the machine (see FIG. 3). A link 162 is pivotally connected by the
pin 64 to arm 156. The other end of link 162 is connected by means
of a lost motion connection, including slot 170 and pin 172, to a
link 174 which in turn is connected to a bracket 176 by means of
pin 178. Link 174 is free to turn about the pivot pin 172 and
likewise an additional link 180 is connected at its lower end for
pivotal movement by means of the pin 182 secured to the frame
24.
It will be seen that the yoke portions 28 of the handle 12 are
pivotally connected by means of the pivot pin 172 to the linkage
system 152. Referring now to FIG. 2 it will be understood that in
the inoperative position, i.e., when the machine is not being
utilized, the yoke 28 of the handle will be in the completely
upright or vertical position such that the roller 150 will be in
the position illustrated in FIG. 2. Likewise, when the yoke 28 is
as shown in the phantom line position in FIG. 5, that is, when the
machine is being moved forwardly, or is in the forward stroke, the
roller 150 remains in the same position as in FIG. 2. However, when
force is exerted upon the handle in the conventional reverse stroke
movement by the user of the machine, movement of the handle and,
consequently, movement of the yoke portions 28 results in shifting
the roller 150 to its solid-line position whereby, also shown by
solid lines for the brush 74, the brush is lifted off the surface
being cleaned so that its rotation will not interfere with the
desired reverse movement for the machine.
The desired position for the roller 150 in response to return
stroke operation is achieved by reason of the reaction principle at
work with the linkage system 152. That is to say, because of the
inertia of the machine on the surface, there is enough reaction to
operate the linkage immediately upon the operator pulling back on
the handle 12 so as to move the yoke portions 28, and hence the
pins 172, within the slots 170. This automatically and immediately
produces movement of the link 162 in the rearward direction which
in turn causes the arm 156 of the bell crank 154 to be rotated and
hence produces rotation of the arm 160 thereof. Consequently, the
roller 150 is forced downwardly against the surface being cleaned.
The final result is that the forward part of the machine is raised
and hence the brush is lifted off the surface.
While there has been shown and described what is considered at
present to be the preferred embodiment of the several features of
the present invention, it will be appreciated by those skilled in
the art that modifications of such features may be made.
Accordingly, it is desired that the invention not be limited to
this embodiment, and it is intended to cover in the appended claims
all such modifications as fall within the true spirit and scope of
the invention.
* * * * *