Note: Descriptions are shown in the official language in which they were submitted.
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A PORTABLE IIIG~ PRESSURE C:LEP~ER
The present invention relates to a portable high-pressure
cleaner, in particular for hobby purposes, and of the type
described in the introductory part of claim 1.
For leisure-time or hobby purposes is known to produce
lightweight and compact high-pressure cleaners. However, it
is often a question of downward~dimensioned and equipment-
wise versions of high-pressure cleaners for professional
10 use, that is to say that known high-pressure cleaners for
hobby parposes normally also are encumbered with the same
disadvantages as high-pressure cleaners for professional
use - including a relatively high price. Furthermore, known
high-pressure cleaners of thi~ type are relatively heavy
15 units because they either include a conventional petrol en-
gine or an electric motor. In the last-mentioned case in
addition to connection to proper electricity supply a spe-
cial security system is required because of the connection
to a water supply.
, 20
' From _the,,disclosure of US Patent No. 3 446 156 is known a
diffential Pressure_~oppet valve comPrisinq an improved
disch,arqP valve by a pumP havinqLa piston moveable in a
normal back-and-forth cycle_capable of forcinq a fluid
25 throuah a,cYlindrical passaqew,a~.~The ~iston has a hollow
interior chamber and includes an in_et ball v,alve,located
at the fron~ end beinq cabable of movin~ between an open
the inlet valve from the interior chamber and a closed Po-
30 sition durinq the forwardstroke where the ball is_forced_
a~ai~e~ t
'¦ The invention has for its purpose to provide an improvedhigh-pressure cleaner of the type mentioned initially, by
35 means of which a significant use-wise flexibility and in-
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creased reliability are achieved - even at reduced manufac-
turing costs.
The high-pressure cleaner according to the invention is di-
5 stinctive in that the ~ump piston consists of a thin-walled
tube of stainless steel_which via a crosshead, connectinq
rods and a crank mechanism i5 directlv drive connected with
an en~ine Piton of the_drive en~ine and which i:_B~m~=
nently connected to the low pressure ~art via intake ope-
lO ninqs to the cavity o~ the pumP piston, that the intakevalve as per see kno~ is positioned at an o~n front_end-
of the pumP piston, and that a valve member of the intake
valve is connected to the PU~p piston in _uch loosely dis-
placeable manner that the valve member by inertia stress is
15 removed from the oPen front end, when the ~ump piston is
moved raPidl~ towards the low-pressure part, and displaced
towards the open end when the PumP piston is moved rapidly
in the o~posite direction. In this manner is obtained a
strongly improved high-pressure cleaner which in conse~uen-
20 ce of the simple and compact construction in particular issuited as a portable cleaning apparatus which despite the
modest siz~ has a very significant cleaning capacity. And
furthermore, by means of simple constructional provisions
is obtained an intake valve build together with the hollow
25 pump piston which wikhout valve spring means may operate
with a relatively high on/of~ frequPncy (50 - 160 opening/
closing movements per second).
In order to obtain a simplified and sturdy construction the
30 high~pressure cleaner according to the invention is such
,~ provided that the PumP ~iston oPpOSite the oPen front_end
has a concentric connectinq part with small diameter, said
connectin~ part beinq ~Eovided with a central, throu~h-qo-
inq bore_~rovided wlth an internal thread, said threaded
35 bore serves the_pur~ose of fixina the vum~ Pi~ton to the
~ crosshead and fixinq a quidin pin t90L stretchinq_centra~
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_y throu~h the pump piston, on which quidinq pin the valve
memberfor th Q intake valve is lournaled.
Expediently the high-pressure cleaner according to the in-
5 vention is such provided that said intake o~enings to the
vavitY of the pump piston ,beinq ~rovided as a number of in-
take channels in an inclined, c~lindrical reducinq piece to
th,e c.;~nnectinq p_rt the axeses of sa.~-intake channels,
stretchinqL rearwards in an acute an~le in relatlon to the
lO centre-axis of the Pump ~iston. Hereby in a simple manner
is achieved an extra easy supply of water from the low-
pressure part into the hollow pump p,iston both during the
forward pumping movement and during the rearward intake mo-
vement of the pump piston.
In order to obtain a larger cleaning capacity and to uti-
lize a sort of differential effect in the low-pressure part
or on the intake-side of the pump piston the high-pressure
cleaner according to the invention is such provided that a
20 rearmost Part of said hollow PumP Piston~ said inclined, _
cyl,indr,ical reducinq piece and the connectin~ Part for the
.~ ~ump,piston are stretchinq throuqh the low-pressure part in
the form of an intake chamber. By simple provisions the
said differential effect is hereby obtain~d on the low-
: 25 pressure side such that the supply of water into the hollow
pump piston from the intake chamber is optimal during the
pump stroke as well as during the in~ake stroke~
In the following the invention is described in more detail
30 with reference to the drawing, in which:-
.
Fig. 1 is a view - partly in section - of an em~odiment of
a high-pressure cleaner according to the invention - as
',seen from above,
Fig. 2 a side view - partly in section - of the high-pres-
sure cleaner shown in Fig. l,
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Fig. 3 an enlarged sectional vi.ew of the pump part of the
high-pressure cleaner shown in Fig. 1,
Fig. 4 an enlarged sectional view of the pump part of the
5 high-pressure cleaner shown in Fig. 2,
Fig. 5 a side view - partly in section - of a preferred em-
bodiment o~ a high-pressure cleaner according to the inven-
tion,
Fig~ 6 a view - partly in section - of the high-pressure
cleaner shown in Fig. S - as seen fro~ above,.
: Fig. 7 an end view - partly in section - as seen from the
15 section line VII VII in Fig. 5.
Fig. 8 a side view - mainly in section - o~ an embodiment
of a pump part of the high-pressure cleaner according to
the invention shown in Figs. 5 - 7, while,
Fig. 9 is a sectional view o~ a pump piston ~or the pump
part shown in Fig. 8 for a high-pressure cleaner according
to the invention.
25 The high-pressure cleaner 2 shown in Figs. 1 and 2 com-
prises a pump part 4 shown in Fig. 3 and in part in Fig. 4,.
. a crank mechanism 6 and a motor in the form of a petrol en-
gine 8. The pump part 4 comprises a low~pressure side or
part 10 and a high-press~re side or part 12 and a hollow,
30 tubular pump piston 14 placed in between, which via a
, crosshead 16, connecting rods 18 and the crank mechanism 6
is drive connected directly with a drive piston 20 of the
petrol engine ~. Furthermore, the pump part comprises an
intake valve 22, a pumping chamber 24, a pressure valve 26
35 and a discharge stub 28 for the connection o~ a iet pipe.
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The pump piston 14 is opposite the intake valve 22 con-
nected with a cylindrical connecting part 30 being con-
nected with the crosshead 16 opposite the pump piston 14. A
rearmost par~ of the pump piston 14 and the connecting part
5 30 stretching on the low-pressure side lo through an intake
chamber 32 to which water at waterworks pressure (2 - 8
har) is supplied through a ball valve 34 adapted to open by
means of an activation rod 36, via a pivot arm 38 connected
with a velocity regulator 40 (speeder~ for the petrol ~n-
10 gine 8. When the latter by way of example is running atidle speed (corresponding to about 3.000 rpm) the hall
valve 34 is closed such that no water is supplied to the
pump part 4 which at least shortly - should stand to ope-
- rate without water supply.
: The intake valve 22 comprises a valve member 42 which atthe open front end of the pump piston 14 is loosely, dis-
: placeable journaled in a valve holder 44 securad to the
; pump piston 14, that is that the valve holder 44 is dis-
20 placed forwards and backwards together with the pump piston
14. The valve member 42 is guided in the valve holder 44 by
means of a stem portion 46 facing forward and which in a
way together with the valve mamber 42 constitutes the pro-
per displacement surface of the pump piston 14. When the
25 pump pis~on 14 including the valve holder 44 during opera-
tion is displaced rapidly forwards and backwards the valve
member 42 will among other things as a consequence o the
inertia stress automatically be pressed towards the open
: front end of the pump piston 14 when the latter during the
30 pumping stroke w is forwardly displaced, and be removed
., ~rom the open front end of the pump piston 14 when the lat-
ter during the intake stroke - is rearwardly displace~. Du-
l ring the pumping strvke the counterpressure in the pumping
¦ chamber of course will also actuate the intake valve 22 to
35 close by pressing the valve member 42 towards the open
~ront end o the pump piston 14. ~.
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The pump piston 14 operates in a pump cylinder 48, which
at the low-pressure side 10 of the pump p~rt is closed by
means of a stuffing box 50 through which the pump piston 14
also stretches. Opposite the stuffing box 50 the pumping
5 chamber 24 is provided in the form of a ring-shaped member
which like the other parts of the pump part 4 is secured in
a surrounding plastic mantle 52. The latter may consist of
two parts or ~e provided by casting in o* the several parts
of the pump part, as the plastic mantle 52 constitutes a
10 foremost handle for the high-pressure cleaner 2.
Opposite the pump piston 14 the pumping chamber 24 forms an
enyagement surface for the pressure valve 26 as a valve
member or valve disk 54 by means of a centr~ spindle 56 is
15 displaceably journaled in a valve housing 58 which com-
prises a ring-shaped cavity 60 around a central guide
bushing 62 ~or the cen~re spindle 56. The ring-shape~ cavi-
ty 60 constitutes a holder for a compression spring 64 en-
suring the pressing of the valve member 54 agai.nst the
20 front side edge of the pumping chamber 24.
The tubular pump piston 14 is at the rear end, that is to
say at the junction to the connecting part 30 provided with
radial intake channels 65 which from the intake chamber 32
25 see to the supply of water from the low-pr2ssure part 10
into the hollow pump piston 14. In front of the intake
channels 65 the pump piston 14 has enlarged diameter com-
`¦ pared to that of the connecting part 30, that is to say
that the pump piston 14 and the connecting part 30 at the
30 lowpressure side 10 constitutes a sort of differential pi-
ston reciprocating in the intake chamber 32 and which re-
sults in supply o~ water from the intake chamber 32 into
the hollow pump piston 14 during the forward pumping stroke
as well a~ during the rearward intake stroke of the pump
35 piston 140
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By the preferred e~bodiment of the high-pressure cleaner 66
shown in Figs. 5 - 7 the same references have been used for
the parts which are recovered by the high-pressure cleaner
2 cfr. Figs. 1 - 4. Furthermore, the high-pressure cleaner
5 66 comprises a petrol tank surrounding the pump part 4, a
carburettor operated by means of the speeder 40 placed in a
handle 72 which as indicated by arrows 74 in addition is
used as sup~ly channel for cooling air to the motor, a
flywheel 76 with belonging ignition-system 78.
: The pump part 4 of the high-pressuxe cleaner 66 is shown
in more detail in Fig. 8 where among other things it may
be seen that the pumping chamber 24 is provided in a rin~-
shaped part 80, which in addition comprises an escape valve
15 mechanism 82 as the ring-shaped part 80 at the front end is
held in place against a combined holder part and valve hou-
sing part for the pressure valve 26 by means of a disc
spring 84 such that the part 80 is allowed to ~e displaced
in forward direction in case of a too high pressure behind
20 the pressure valve 26, by way of example if a connected jet
:. pipe is blocked so that the excess-pressure may be drained
, off via a lower radial opening 86.
By the high-pressure cleaner 66 the intake valve 22 is ar-
25 ranged in a different way than that of the high-pressure
cleaner 2 where the valve member 22 is displaceably jour-`
naled in a valve housing 44. Instead a valve member 88 at
the open front end of the hollow pump pist~n 14 is displa-
ceably journaled on a valve pin 90 stretching centrally
30 through the hollow pump piston 14 and secured to a ~upport
bushing 92 being ecured inside a central bore 94 of the
connecting part 30. The valve member 88 cooperates with a
head part 96 of the valve pin 90 in such a way that the
~ valve member 88 is allowed to be rem~ved very little from
i 35 the open front end of the pump piston 14 when the latter
during the intake stroke is displaced rearwards etc. The
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high-pressure cleaner 66 comprises like the high-pressure
cleaner 2 a water supply 98 which is partly surrounded by a
sound absorber 100.
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