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Патент USA US3080275

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March 5, 1963
_ 3,080,265
Filed Oct. 26. 1960
m 4 .
Patented Mar. 5,1953
nozzle. The velocity of the ?uid ejected from each bore
thus comprises an axial component which serves to urge
the nozzle forwardly, and a component transverse to the
axis which maintains a spacing between the nozzle and
the walls of the conduits. As the nozzle automatically
propels itself through the waste piping it is carried on a
Wolfgang Maasberg, Mulheim (Ruhr), Germany, assrgnor
to Firma Osirar Maasherg, Duisburg, Germany
Filed Get. 26, 1966}, Ser. No. 65,056
laims priority, application Germany Get. 28, 1%59
6 Claims. (ill. 134-24)
cushion of ejected Water around or over immovable ob
structions while the Water jets loosen and dislodge ac
cumulated sediment and sludge.
The aforedescribed nozzle with rearwardly directed
My present invention relates to a process for cleaning 10
water jets may also be employed as the propelling means
and clearing disposal systems for sewage and other wastes
for conventional cleaning devices (e.g. brushes and
adapted to be conveyed in a liquid flow, and to apparatus
scrapers) and/or for ?ushing nozzles. Thus, according
for carrying out such process.
another speci?c feature of the invention, the propelling
The underground ‘waste-conducting networks of metro
politan areas frequently are obstructed by deposits of 15 nozzle is accompanied by a ?ushing nozzle, rigidly a?‘ixed
thereto, which is provided with a source of wash ?uid
sludge, sediment and objects which, owing to the rela
under pressure and means for dispensing the ?uid in a
tively slight grade of the waste conduits, cannot be suc
generally forwardly directed ?ow to wash away loosened
cessfully ?ushed free by the slow-moving liquid carrier
sludge and/ or a plurality of radially directed streams to
?owing therethrough. Although many methods of clear
clean the walls of the conduits. The ?ushing nozzle may
ing and cleaning sewage networks have been proposed 20 be
supplied from the high-pressure hose which is con
and employed hitherto, substantially all such methods re
nected to the propelling nozzle or from a second, inde
quire some tedious and noxious hand labor while several
pendent hose which may terminate at a pressure pump.
necessitate expensive and complicated machinery. The
The ejection pressure of water from the ?ushing nozzle
aforementioned methods include mechanical removal of
is also, preferably, greater than about 60 atmospheres.
obstructions along the walls of waste conduits by brushes,
The propelling nozzle is inserted into the waste-dis
scrapers, scoops and the like drawn through the pipes by
posal channels, via access manholes, at the end of its high
?exible cables, the hydraulic removal of sediment by
pressure conduit (normally a ?exible hose) which is, ad
washing with water and the removal of sludge by suction
vantageously, of a small caliber and in a preferred em
ing apparatus. The washing nozzles, suction heads and
bodiment has an inner diameter between substantially 10
scraping devices were generally propelled through the
and 20 mm., and- is displaced along these conduits over
pipes at the ends of rotating ?exible shafts, driven by a
a distance determined by the length of the hose. The
complicated mechanism at the street level and fed through
directed propelling jets of the nozzle simul
manholes into the sewage network, which frequently were
taneously loosen sediment and sludge lining the walls
halted by sharp bends in the pipe. Manual labor and
of the conduits. Upon reaching the extension limit of the
considerable time often were required to release the clean 35
hose, the nozzle is drawn rearwardly against the force of
ing apparatus.
the jets whereby the rearward force of the latter, rein
it is an object of the present invention to provide an
forced by the withdrawal force, undercuts and dislodges
improved process for cleaning and clearing waste-dis~
posal systems, adapted to obviate the disadvantages of 40 heavier concentrations of sediment which are either
washed away or carried to the vicinity of the manhole
earlier processes.
It is another object of my invention to provide an im
proved process for washing the walls of waste conduits
of different diameters with a minimum of manual labor.
. whence they may be scooped out.- The ?ushing nozzle
which may accompany the propelling nozzle into the con
duits serves, upon the withdrawal thereof, to provide a
?nal washing of the conduit wall and to dispense addi
Another object of the invention is to provide a relatively
tional quantities of water to carry o? any residual waste.
simple and inexpensive apparatus for cleaning sewage
The water jets from the nozzles, as the latter are with
drawn from the conduits via the manholes, scour the
A more speci?c object of the present invention is to pro
manhole shaft and its appurtenances (i.e. steps, ladder
vide a self-propelled device for ?ushing Waste-disposal
rungs and the like).
conduits, adapted to pass relatively freely through the
The above and other objects, features and advantages
conduit network.
of my present invention will become more readily ap—
According to a feature of the invention, a washing
parent from the following description, reference ‘being
nozzle at the extremity of a ?exible high-pressure hose is
made to the accompanying drawing in which:
provided with outlet-forming means adapted to emit at
FIG. 1 is an axial cross—sectional view of a portion of
least one high-velocity jet of wash ?uid in a generally
a ‘waste-disposal network illustrating a cleaning device,
rearward direction, thereby imparting forward motion to
according to the invention;
the washing nozzle to propel the latter through the net
FIG. 2 is a cross-sectional view of the propelling noz
'work of waste-disposal conduits. The wash ?uid, prefer
zle of the device shown in FIG. 1; and
ably water, is fed to the nozzle with a pressure preferably
‘FIG. 3 is a view similar to FIG. 2 of the propelling
in excess of about 66 atmospheres gauge from a high
nozzle joined to a ?ushing nozzle,
pressure pump at street level which communicates with 60
In FIG, 1, I show a manhole shaft 10 communicating
the hose. The latter is introduced into the conduit net
with a waste-disposal channel 11 of a sewage system be
work via the usual manholes spaced therealong. I have
low the street level 13. The manhole shaft 10 is pro~
found that the optimum ?ow of ?uid from the nozzle ex
vided with ladder rungs 12 adapted to afford access to the
ceeds about 90 liters per minute.
channel 11. Through a hole 15 in the usual manhole
The nozzle, according to a more speci?c feature of the 65 cover 14, a propelling head or nozzle 2a (described in
invention, is provided with a central channel communi
greater detail hereinafter with reference to FIG. 2) is in_
eating with the high-pressure hose and with a plurality of
serted at one extremity of a relatively long ?exible high
angularly equi-spaced outlet bores. The latter are di
pressure hose 1 ‘whose other extremity terminates at a
rected generally rearwardly to impart forward motion to 70 high-pressure pump 3 at the street level. The pump 3 is
the nozzle as a high-velocity ?uid is ejected therefrom,
connected to a source of ?uid, preferably water, not
and are inclined at an acute angle to the axis of the
-As illustrated in FIG. :2, the nozzle 2a is provided with
a central chamber ‘6-, which communicates with the inner
cavity of ‘the hose 1, and with a plurality of angularly
equispaced outlet bores 7 which are inclined rearwardly
at an acute angle to the axis of the nozzle 2a and open
at the external surface thereof.
In operation, the nozzle 2a and its hose 1, which may
be assumed to have an internal diameter of substantially
110 to 20 mm, is inserted into the channel 11 via manhole
chamber communicating with said ?exible-hose means and
with a plurality of angularly spaced rearwardly and out
wardly directed bores opening into said chamber and ter
minating at the outer surface of said nozzle, each of said
bores being adapted to eject a jet of said ?uid in a gen
erally rearward direction whereby said nozzle is dis
placed within said conduit in a generally forward direc
tion, a ?ushing nozzle operatively connected to said cylin
drical nozzle and displaceable therewith within said chan
10. Pump 3 maintains a water ?ow of about 90 liters per 10 nel for dislodging obstructive matter therein, and a source
minute‘ or greater through the hose 1 and from the out‘
of ?uid for said ?ushing nozzle, said ?ushing nozzle being
let-s 7 at a pressure in excess of approximately 6-0 at
provided with outlet means for emitting a generally for
mospheres. The high-pressure water jets ejected from
wardly directed steam of ?uid.
the outlet bores 7 in the directions of arrows 4 propel the
'2. An apparatus according to claim 1 wherein said
nozzle 2a and its hose along the channel 11, thereby
lbores are inclined at an acute ‘angle to the ‘axis of ‘said
loosening and dislodging sediment and sludge. When the
limit of the length of the hose 1 has been reached and the
3. An apparatus ‘according to claim 1 wherein said
nozzle 2a is no longer able to propel itself through the
?exible-hose means is connected to a source of ?uid
sewer v11, the hose 1 is drawn from the manhole 10 (e.g.
adapted to maintain the pressure of said ?uid at said noz
by a Windlass at the street level) whereupon the jets 4 20 ~zle at a magnitude of at least 60 'atm.
of water undercut and dislodge additional accumulations
of sediment to clear the sewer. As the nozzle 2a is drawn
out of the manhole shaft 10, the latter and its rungs 12
are thoroughly "cleaned by the ‘water jets.
4. An apparatus according to claim 1 wherein said
?ushing nozzle is provided with ‘a central inlet for ?uid
‘and a plurality of radial outlet bores communicating with
said inlet and angularly spaced about the axis of said ?ush
The nozzle 2a may also be used to propel hydraulic 25 ing nozzle.
cleaning accessories such as the ?ushing nozzle 2b, shown
5. A process for cleaning a waste-disposal channel,
in FIG. 3, through the channel 11. Nozzle 2b is pro‘;
comprising the steps of inserting a ?exible high-pressure
vided with a hose 1b which terminates in a pressure pump .
hose terminating in a nozzle into said channel, pumping
similar to that shown at 3 in FIG. 1 and is a?iX'ed to the
a ?uid under pressure through ‘said hose to said nozzle,
hose 1 of the nozzle 2a by a clamp 8. Flushing nozzle 2b
ejecting at least one jet of ?uid from said nozzle in a
is provided with ‘a plurality of radial outlet bores 9' and
generally rearward direction within said channel, thereby
with a forwardly directed bore 9" which communicate
displacing said nozzle in a generally forward direction,
with the inner channel 17 of ‘the nozzle. A's nozzle 22:
ejecting an additional stream of ?uid in a forward direc
is carried along with the propelling nozzle 2a into the
tion, and subsequently withdrawing said hose and said
‘channel v'11, it vserves to wash the walls of the conduit - nozzle in 'said rearward direction while continuing to
and to ?ush dislodged ‘sediment away from the cleaned
pump ?uid through said hose.
6. A process according to claim 5 wherein said ?uid
The invention as described ‘and illustrated is believed to
is pumped "at a pressure ‘of at least 60 atmospheres.
admit of many modifications and variations deemed to
be within the ability of persons skilled in the art and in 40
References Cited in the ?le of this patent
tended to be included within the spirit and scope of the
appended claims.
I claim:
7 558,992
Silver ________ -1. ____ .. Apr. 28, 1896
1. An apparatus for cleaning a wastesdi'sposal Ichan- -
Burns _______________ __ Mai‘. 21,
Sladden _____________ __ May 10,
Hit‘z _______________ __>_.. Aug. 31,
Pletcher .. ____________ __ Feb. 21,
nel, comprising 1a generally cylindrical ‘nozzle adapted to 45
be inserted into said channel, ?exible-hose means attached
to the rear of said nozzle {or 'supplyingfa ?uid under pres
sure thereto, ‘said nozzle ‘being provided with a central
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