U.S. patent number 3,690,559 [Application Number 05/072,671] was granted by the patent office on 1972-09-12 for tractor mounted pavement washer.
Invention is credited to Robert H. Rudloff, 3205 Los Felix.
United States Patent |
3,690,559 |
|
September 12, 1972 |
TRACTOR MOUNTED PAVEMENT WASHER
Abstract
Disclosed is a pavement washer having two sets of spray nozzles
mounted on the front of a small tractor. Nozzles of the first set
are aimed ahead substantially horizontally to throw a pattern of
cleaning solution well ahead of the tractor, while the second set
of nozzles are aimed sharply downward as well as forward to spray a
pattern of water ahead of the tractor but behind the cleaning
solution. Also disclosed is an arrangement for connecting the
tractor to a stationary source of water through a hose wherein
provision is made to shut off the ignition of the tractor before
the hose is pulled taut.
Inventors: |
Robert H. Rudloff, 3205 Los
Felix (Los Angeles, CA 91205) |
Family
ID: |
22109076 |
Appl.
No.: |
05/072,671 |
Filed: |
September 16, 1970 |
Current U.S.
Class: |
239/163; 134/172;
239/550; 15/405; 180/271; 239/754 |
Current CPC
Class: |
E01H
1/101 (20130101) |
Current International
Class: |
E01H
1/00 (20060101); E01H 1/10 (20060101); B05b
001/20 () |
Field of
Search: |
;239/11,159,163,166,167,172,287,550,587,588 ;180/82 ;134/115,172
;15/50R,82,405 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: M. Henson Wood, Jr.
Assistant Examiner: Michael Y. Mar
Attorney, Agent or Firm: Fowler, Knobbe & Martens
Claims
What is claimed is:
1. A pavement cleaning machine comprising in combination: a. a
vehicle; b. a first set of spray nozzles extending transversely
across the front of said vehicle and connected to a source of
pavement treating solution and mounted on said vehicle in an array
shaped to direct said solution at said pavement in a first pattern
ahead of said vehicle as said vehicle travels; and c. a second set
of spray nozzles extending transversely across said vehicle and
connected to a source of water and mounted on said vehicle in an
array shaped to direct said water at said pavement in a second
pattern spaced in non-overlapping relationship behind said first
pattern and being aimed forward and toward the ground to sweep the
pavement with water for rinsing said solution from the pavement,
said first and second sets of nozzles being operated at the same
time.
2. A pavement cleaning machine in accordance with claim 1 and
further characterized by the second pattern being wider than the
first pattern and being inwardly aimed at its ends into an arcuate
shape so as to confine said solution to the pavement covered by
said second pattern during the travel of said vehicle.
3. A pavement cleaning machine in accordance with claim 1 wherein
at least one of said first and second set of spray nozzles is
carried on a manifold comprised of two pipes removably extending in
opposite directions from a common threaded pipe coupling.
4. A pavement cleaning machine comprising in combination: a. a
self-powered vehicle; b. a first set of spray nozzles connected to
a source of pavement treating solution and mounted on said vehicle
in an array shaped to direct said solution at said pavement in a
first pattern; c. a second set of spray nozzles connected to a
source of water and mounted on said vehicle in an array shaped to
direct said water at said pavement in a second pattern spaced in
non-overlapping relationship with said first pattern for rinsing
said solution from the pavement; d. a hose for supplying water to
said second set of nozzles from said source of water; e. a tension
spring connecting portions of said hose so as to form a loop
therein; and f. sensing means connected across the neck of said
loop and electrically connected to disable said vehicle when said
tension spring has been stretched to a predetermined length.
5. A pavement cleaning machine comprising in combination: a. a
self-powered vehicle; b. a first set of spray nozzles connected to
a source of pavement treating solution and mounted on said vehicle
in an array shaped to direct said solution at said pavement in a
first pattern; c. a second set of spray nozzles connected to a
source of water and mounted on said vehicle in an array shaped to
direct said water at said pavement in a second pattern spaced in
non-overlapping relationship with said first pattern for rinsing
said solution from the pavement; d. a pipe assembly rotatably
mounted upon the rear of said vehicle in a pipe coupling member,
said pipe assembly having a horizontally extending portion
swiveling in a horizontal plane about a verticle axis defined by
said pipe coupling member; e. means for connecting said pipe
coupling member to said second set of nozzles; and f. a hose
connected between said horizontally extending portion and said
source of water.
6. A pavement cleaning machine comprising in combination: a. a
vehicle; b. a tank mounted on said vehicle for holding a pavement
cleaning chemical; c. means on said vehicle for connecting to a
source of water; d. an injector having a first inlet connected to
receive chemical from said tank, a second inlet connected to
receive water from said source and an outlet for dispensing a
solution of said chemical and said water; e. a first set of spray
nozzles connected to receive said solution from said injector
outlet and mounted on the front of said vehicle in an array shaped
to direct said solution at said pavement in a first pattern; and f.
a second set of spray nozzles connected to receive water from said
source and mounted on the front of said vehicle in an array shaped
to direct water at said pavement in non-overlapping relation with
said first pattern for rinsing said solution from the pavement.
7. A pavement cleaning machine in accordance with claim 6 wherein
said means for connecting to a source of water includes a pump on
the vehicle for increasing the water pressure.
8. A pavement cleaning machine in accordance with claim 6 wherein
said vehicle includes a seat and controls for operation by an
operator positioned on the seat.
9. A pavement cleaning machine in accordance with claim 6 wherein
said tank is non-pressurized and vented to the atmosphere.
10. A pavement cleaning machine in accordance with claim 6 and
further characterized in that said first and second set of nozzles
are respectively supported by upper and lower manifolds rigidly
mounted transversely across the front of said vehicle, said first
set of nozzles being aimed a substantial distance ahead of said
machine, and said second set of nozzles being aimed toward the
pavement closely in front of the machine.
11. A pavement cleaning machine in accordance with claim 10 wherein
said second set of nozzles are spaced so as to produce a single
continuous spray pattern extending across the front of the
vehicle.
12. A pavement cleaning machine in accordance with claim 11,
wherein said second manifold has ends which extend past the ends of
said first manifold and extend forwardly with the end nozzles on
the second manifold directed toward the central part of the water
spray pattern to confine said solution.
13. For spraying a cleaning solution and water onto a pavement from
a self-powered vehicle, a spray head assembly comprising in
combination: a. first and second sets of spray nozzles mounted on a
common framework; b. means for attaching said framework to the
front of said vehicle, said first and second sets of spray nozzles
being respectively aimed to deposit said solution and water in a
first and a second pattern in front of said vehicle when the
framework is so attached, said first pattern being non-overlapping
spaced from said second pattern; c. said first and second sets of
nozzles being respectively supported by first and second spray bars
extending transversely across the front of said vehicle, the first
spray bar being mounted above the second spray bar, with its
nozzles aimed substantially horizontally forward so as to deposit a
ribbon of said solution ahead of said vehicle as said vehicle
travels and the nozzles of the second set being aimed forward and
toward the ground to sweep said pavement with water.
14. A spray head assembly in accordance with claim 13 and
characterized further in that said second spray bar is longer than
said first spray bar, and has a nozzle at each of its ends which
extend forward so as to produce an arcuate spray pattern which
sweeps the edges of said ribbon of solution toward each other.
15. A spray head assembly in accordance with claim 13 and
characterized further in that each of said spray bars is comprised
of two symmetrical sections threaded at one end and removably
fitted into opposite sides of a common coupling.
Description
The present invention is directed to a mobile pavement washing
machine and more particularly to a tractor mounted spray head
assembly by which a cleaning solution and water are sprayed on the
pavement, with the water being sprayed far enough from the cleaning
solution to allow the latter to take effect before being washed
away.
With the growing public acceptance of drive-in places of commerce,
the importance of the parking lot and of its maintenance has also
increased. This is particularly true of drive-in restaurants where
cleanliness of the parking lot is desirable since people eat either
in their cars parked in the lot or at tables which are outside and
immediately adjacent the parking lot. Heretofore parking lots have
usually been cleaned manually, which is a time consuming,
expensive, and unpleasant task. The present invention is directed
to a small, modestly priced machine capable of cleaning a pavement
such as a parking lot rapidly and thoroughly. In accordance with a
principal feature of the invention, the pavement cleaning apparatus
includes a spraying assembly mounted upon a small tractor, usually
in front. The spraying assembly preferably includes at least two
sets of nozzles. Through the first set of nozzles a cleaning
solution, such as a mixture of a detergent and water is sprayed in
a pattern well ahead of the tractor. Through the second set of
nozzles water is sprayed, also ahead of the tractor but
sufficiently spaced from the cleaning solution to allow the
solution to have its desired cleaning effect upon the pavement
before being rinsed away.
It is desirable that, as the tractor moves ahead, all of the
cleaning solution be rinsed away. Toward this end the spray pattern
in which the water is discharged at the pavement is made wider than
the spray pattern of the cleaning solution, with the spray pattern
of water being preferably made arcuate so as to tend to sweep
inward and confine the strip of cleaning solution preceding it.
The water requirements of the pavement cleaning machine are
considerable and it is most expedient to satisfy them by connecting
the machine to a remote source of water through a hose rather than
by carrying the necessary water supply on, or with, the tractor.
Accordingly, in accordance with another feature of the invention,
water is fed to the tractor from a stationary water source through
a hose which is so designed that if through inadvertence the
tractor should be driven too far away from the stationary water
source, thereby tending to stretch the hose, this condition will be
sensed and will preferably stop the tractor automatically. In
keeping with this feature of the invention, at least one loop is
formed in the hose and a yieldable means, such as a tension spring,
is connected across the neck of that loop. Thus, as the vehicle is
driven in a direction away from the stationary water source,
tending to stretch the hose, the loop will be opened against the
restraining force of the tension spring so that the pulling force
exerted on the hose is determined initially by the strength of the
spring. Sensing means, such as a limit switch, are connected across
the neck of the loop in such a way that when the tension spring has
been stretched to a predetermined limit, which is designed to occur
before the loop has been completely straightened, the sensing means
will be actuated. Advantageously, the sensing means may be a limit
switch which is connected in series with the ignition of the
tractor engine so that the engine is disabled before the loop is
completely straightened, thereby preventing the hose from being
damaged.
To prevent the water hose from interfering with the operation of
the tractor, the hose is connected thereto by means of a
horizontally swiveling pipe carried at the rear of the tractor. The
range of travel of the swiveling pipe is limited by a pair of stops
so as to insure that the pipe points either to the rear or to the
side of the tractor, thereby keeping the hose out of its way.
Preferably, the loop which is provided for stress relief is formed
immediately at the point where the hose joins the swiveling pipe
and the pipe extends horizontally at a sufficient height above the
pavement to prevent the loop from dragging along the ground.
The invention may be more clearly understood from the following
detailed description when taken in conjunction with the appended
claims and the accompanying drawings wherein:
FIG. 1 is a perspective view of a tractor mounted pavement washer
incorporating features of the present invention;
FIG. 2 is a front view of the tractor mounted pavement washer
illustrated in FIG. 1;
FIG. 3 is a side view, partially cut away, of the front portion of
the pavement washer illustrated in FIG. 1 showing in particular the
location of the water pump and detergent injector carried by the
tractor;
FIG. 4 is a perspective view of a spray head of the type used to
direct a water rinse at the pavement; and
FIG. 5 is a side view of the tractor mounted pavement washer
illustrating the spacing between the spray patterns of cleaning
solution and rinsing water and also showing the hose arrangement
for supplying water to the tractor.
An exemplary embodiment of a tractor mounted pavement washer
incorporating features of the present invention is illustrated in
FIG. 1. The tractor 10 may be a commercially available type in
which a four wheeled chassis 11 is powered by a gasoline engine 13
and controlled by means of a steering wheel 15, a gearshift lever
17, a brake pedal 19, and other controls not shown, by an operator
positioned on a seat 21. Mounted on the front of the tractor is a
spray head assembly comprised principally of a first set of spray
nozzles 23 and a second set of spray nozzles 25 and 27. Serving to
discharge a cleaning solution, the first set of spray nozzles are
anchored in and supplied through a manifold 29 which, for sake of
easy replacement, is comprised of two symmetrical halves 29a and
29b. Each of the manifold halves 29a and 29b are threaded at one
end and are screwed into a common coupling as best seen in FIG. 2.
A second manifold 33, also comprised of two halves 33a and 33b,
extends under the first manifold 29 and serves to support, and
supply water to, the second set of spray nozzles 25 and 27. Again,
for sake of easy replaceability, the second manifold 33 is made of
two symmetrical sections, with one end of each section being
threaded into a common coupling 35. The couplings 31 and 35 permit
replacement of the manifold sections 29a and 29b, and 33a and 33b
not only with identical components, as would be the case in the
event that the replaced part is damaged, but also with longer or
shorter sections in the event that a different width of spray
pattern is desired.
The manifolds 29 and 33 are rigidly connected to form a single
assembly by means of a pair of horizontally spaced, vertically
extending brackets 37 and 39 upon which they are mounted by a set
of U-clamps 41. The entire spray head assembly, comprised of the
manifolds 29 and 33, the spray heads 23, 25 and 27 mounted thereon
and the brackets 37 and 39, is attached to the front of the tractor
by suitable means which include a pair of side braces 43 bolted to
the front fenders of the tractor 10.
Water is supplied to the spray nozzles 25 and 27 from a remote,
stationary source of water shown as the tap 28 through a flexible
hose 43 attached to the back of the tractor 10. In order to prevent
interference with the operation of the tractor, the end of the hose
43 is connected to pipe assembly 45 having a horizontally extending
portion 45a and a short vertical end portion 45b rotatably received
in a coupling 47 in such a manner as to permit the horizontal pipe
portion 45a to swivel from one side of the tractor 10 to the other
in a horizontal plane. A pair of stops 49 and 51 bolted on opposite
sides of the tractor 10 at its rear extend upwardly to limit the
motion of the pipe portion 45a to approximately 180.degree. of arc,
thereby preventing the pipe portion 45a and the hose 43 attached to
it from swinging past the rear wheels of the tractor. Cross braces
50 and 52 which extend horizontally between the stops 49 and 51
serve to help maintain them rigidly upright and also serve as a
mounting platform for a vertically extending pipe 54 upon which the
coupling 47 is secured.
To supply the necessary water pressure at the nozzles 25 and 27 the
water received through the hose 43 and the pipe assembly 45 is
first fed to a water pump 53 (see FIG. 3) through a short length of
heavy water hose 55 which is connected between the pump 53 and the
pipe 54 under the coupling 47. From the pump 53 water at the
desired pressure is fed through a pipe 57 to the inlet of a
coupling 59 having an upper and a lower outlet port 59a and 59b.
The lower outlet port 59b of the coupling 59 is connected by a
short length of pipe 61 to the coupling 35 which connects the two
halves of the water discharge manifold 33. The upper outlet port
59a of the coupling 59 is similarly connected through a short piece
of pipe 63 to the water inlet port 65a of an injector whose
function is to supply the upper set of spray nozzles 23 with a
cleaning solution, e.g. comprised of a detergent and water. The
water is supplied to the injector 65 from the pump 53 and through
the coupling 59 as just described. The detergent of other pavement
cleaning chemical is carried on the tractor 10 in a non-pressurized
tank 67 which is vented to the atmosphere and connected through a
suitable line 69 to a second inlet port 65b of the injector 65. The
injector 65 has an outlet port, indicated at 65c, where a mixture
of the detergent received through the line 69 and water received
through the coupling 59 is discharged under pressure. The injector
outlet 65c is connected through a pipe section 71 to an inlet of
the coupling 31 through which the solution is distributed to the
two halves of the upper manifold 29.
Injectors of the type suitable for use with the present invention
are well known. One which was found to operate satisfactorily is
manufactured by the Dema Engineering Company of St. Louis, Mo.
under its model 200 series. In operation, water is supplied under
pressure by the pump 53 directly to the spray nozzles 25 and 27 and
to the water inlet port 65a of the injector 65. In a manner which
need not be understood for purposes of explaining the present
invention, a vacuum is created in the injector 65 by the rapid flow
of water through the water inlet port 65a and this vacuum has the
effect of pulling detergent from the tank 67 through the inlet port
65b into the injector 65, where it is mixed in a predetermined
proportion with water. The water-detergent mixture is expelled
through the injector outlet port 65c and is fed to the manifold 29.
Means, not shown, are provided on the injector 65 to adjust the
richness of the water-detergent mixture.
In addition to serving as a source of cleaning solution for the
spray nozzles 23, the injector 65 may also be used to supply the
cleaning solution to additional accessories, such as hand operated
washing-brushes of the type having an opening through which a
cleaning solution is dispensed during use. Where this feature is
desired, a standard threaded tap would be provided on the pipe
section 71 which is connected to the output port of the injector
65. Shut-off valves would be interposed respectively between the
tap and the coupling 31 and between the coupling 59 and the
coupling 35 in order to permit use of the accessory when the
tractor is not being used for pavement cleaning.
It is an important aspect of the invention that a cleaning solution
and water are deposited on the pavement to be cleaned in two
patterns 22 and 24 (see FIG. 5) which are spaced apart sufficiently
to permit the cleaning solution to take effect before it is rinsed
away by the water. Toward this end the spray nozzles 23 are
supported relatively high above the pavement to be cleaned and are
aimed to spray substantially directly forward that is, within
15.degree. of horizontal in order to project the cleaning solution
a substantial distance ahead of the tractor 10. In contrast, the
spray nozzles 25 and 27, which serve to direct rinsing water at the
pavement, are mounted relatively close to the pavement and are
directed at it at a fairly sharp angle, of the order of 60.degree.
from vertical. This has the effect of reducing the distance to
which the water is projected forward from the tractor 10 and also
serves to increase the force with which the water strikes the
pavement. Accordingly, the water pattern produced by the apparatus
of the present invention impinges sufficiently far behind the
pattern of cleaning solution to allow the latter to take effect and
at the same time the water pattern strikes the pavement with
considerable force, thereby enhancing further the cleaning
effectiveness of the unit.
The preferred distance between the cleaning solution spray pattern
22 and the rinsing water spray pattern 24 will vary with the length
of time it is desired that the cleaning solution have to act upon
the pavement and upon the speed with which it is expected that the
tractor 10 will be driven. However, in order to insure that the
cleaning solution will not be washed away prematurely, it is
desirable that there be some separation between the two spray
patterns, i.e. that they do not overlap. In some instances, either
or both of the manifolds 29, 33 may be arranged for vertical
adjustment to adjust the separation between patterns.
A spray nozzle of the type found suitable for use on the lower
manifold 33 for dispensing water is shown in FIG. 4 and is
manufactured by Spraying Systems Co. of Delwood, Ill. as Model 1/4
P5010. At a pressure of 40 pounds per square inch the spray
characteristics of the particular nozzle used were such as to
project water at the pavement in a flat, fanshaped spray pattern at
a 30.degree. included angle with the pavement and with the spray
angle being 50.degree., as shown in FIGS. 3 and 4. The spray
nozzles 23 preferably are spaced so as to produce a single
substantially continuous pattern across the front of the tractor
10.
It has been found advantageous to make the combined water spray
pattern produced by the nozzles 25 and 27 wider than the cleaning
solution pattern laid down by the spray nozzles 23 and to space the
nozzles 25 and 27 to produce a single continuous spray pattern
extending transversely across the tractor in order that all of the
cleaning solution be rinsed away by the water. For this reason the
lower manifold 33 is made longer than the upper manifold 29 and is
provided with a larger number of spray nozzles 25 and 27. In
addition, it has been found particularly effective to distribute
the rinsing water in a pattern such that the strip of cleaning
solution will be confined by the edges of the rinsing water rather
than being forced by it to flow out of the path of the rinsing
water. For this purpose, the ends of the lower manifold 33 are
angled forward, with a spray nozzle 27 being mounted at each such
forwardly angled end. As a result, the spray pattern discharged by
the end nozzles 27 is directed partially inward, toward the central
part of the water spray pattern produced by the spray nozzles 25,
thus providing a water spray pattern as shown in FIG. 1, which for
convenience in terminology can be called arcuate or convex. It has
been found satisfactory to use the same type spray nozzle as that
which is used for the central water spray nozzles 25, although one
with a wider spray angle might be used to advantage where it is
desired to extend the curved edges of the water spray pattern.
An alternative spray pattern may be used with the pavement washer
of the present invention where it is desired that the cleaning
solution remain on the pavement for a particularly long time before
being rinsed away. With this spray pattern the cleaning solution
pattern is directed to one side of the water pattern. Thus with
each pass of the tractor two strips will be sprayed side by side,
one of cleaning solution and one of water. And as each strip of
cleaning solution is being washed off the pavement by the adjacent
spray pattern of water, during successive passes with the tractor
another strip of cleaning solution is being laid down and will not
be rinsed off until the following pass. For this purpose, the upper
manifold 29 may be arranged to provide adjustment in the direction
of spray from the detergent nozzles 23.
In order to reduce the risk of tearing the pipe 43 due to
inadvertently driving the tractor 10 beyond the reach of the hose
43, means are provided to give an immediate warning when the reach
of the hose 43 has been approached and before the hose breaks.
Specifically, a loop 71 is formed in the hose 43 near the swiveling
pipe portion 45 and the ends of the loop are yieldably connected
through a tension spring 73 which is connected across the neck of
the loop 71. Also connected across the neck of the loop 71 is a
cord 75 whose one end is connected to one end of the loop 71 at 71a
and whose opposite end is connected to a switch 77 mounted on the
pipe 45a near the other end 71b of the loop 71. In a manner not
shown, the switch 77 is connected in series with the ignition
system of the tractor engine 13 so that when the cord 75 is pulled
the switch 77 opens and the ignition system of the motor 13 is
temporarily interrupted, thus stopping the motor. The length of the
cord 75 is selected so that, as the tractor 10 is driven to the
limit of the hose 23 and begins to open the loop 71 against the
force of the spring 73, the cord 75 is pulled tight before the loop
71 itself is completely straightened. Consequently, the switch 77
will be actuated and the tractor will be stopped while there is
still some slack left in the loop 71 of the hose 23 and before the
hose is damaged. If desired, an additional loop 79 may be provided
in the hose 43 with a tension spring 81 connected across the second
loop.
In some cases the pipe assembly 45 and the hose 43 with its
associated accessories may be replaced by a water tank carried on
or with the tractor 10. Where the amount of water required is
moderate, the tank may be carried on the tractor itself. A greater
water requirement could be satisfied by providing a separate,
towable water tank hitched to the back of the tractor.
* * * * *