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Патент USA US2406915

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Sept- 3; 1.946.. I
r p; G. SMELLIE>I I '
Filed April 26, 1943
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SePt- 3, 1946-
Filed April 26, ‘ 1945
3 Sheets-Sheet 2
?orzald 6. Smellz'e
Sept. 3, 1946. _
“2,406,915 I
Fil'ec'i April 26, 1943
3 Sheets-Sheet~ 3
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.Dorzald 6.}87nellz'e
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Patented Sept. 3, 1946
Donald ‘G. Smellie, Canton, Ohio, a'ssign‘orlto-The'
Hoover Company, North Canton, 0h'io,.a' cor
poration. of Ohio
Application April 26, 1943;-Seria!1ND.r484;515
7 Claims.
(Cl; lid-16) '
The :present invention relates'to suction clean
Referring now‘ to=the=drawings in which a pre
erscin general and more particularlyto new and
novelarrangement of ‘parts in a suction cleaner.
ferred embodiment of» the invention isdisclosed:
More-speci?cally, the invention comprises an im
proved type of suction cleaner in which the dirt
cleaner constructed~in~accordance.withhthe pres
Figure 1 is a-vertical- section through-asuction
I ent invention;
laden air'stream is drawnjby the suction-creating
' Figure 2 is a'vtransverse‘horizontal section upon
means of ‘the cleaner through aninitial dirt sepa
thewline‘ 2*: of Figure‘ l through-the suction
cleaner» and shows-tlieair-?ow-controlling valve;
rator and‘is exhaustedvby'the suction-creating
means into a' ?nal dirt-separator, means being
provided to clean the‘s?naldirt-separator ‘com
prising a continuously operated’ cleaningnozzle
which is supplied with a maximum?ow of-clean
ihg' air each time the seal of the main cleaning
nozzle is broken.
The instant‘ application‘ discloses .certain' fea
tures in‘ common with theIco-‘?led'and co-pencling
applications, Serial Nos; 484,510 and 484,514,
Figure 3 is a vertical section through the bel
lows valve-actuating; mechanism illustrated in
Figure 2;
Figure 41 is a» transverse horizontal section
through the‘ speed-reducing mechanism connect-i
ing the ?lter-cleaningnozzle 5t0~the main motor
shaft; bcingrasection takenupon the lines» 4-41
of Figuresl‘and 6;
‘Figure-5 isra‘ section-‘upon ‘the line‘5—-5 of Fig
filed in the names "of‘Louis "K1 Acheson and the
ure 4;
present inventionds Viewed in" the nature ‘of an
through the suction-creating-fan unit and speed
reducin‘g' mechanism, beingtaken upon the line‘’
present inventor; respectively; and? both assigned
to the assignee of. thee-presentapplication; The‘
improvement upon ‘ the‘: inventions disclosed ‘ in
those applications and common subject matter is'
to be protected therein. I‘n‘SerialNo. 484,510
Figured is an enlarged partial ‘vertical section
The . present invention comprises 2an improve;
the general arrangement of the‘ cleaner and the 25 ment relatingeto' the’ basictin-vention disclosed in
the-patent‘ toBiblei 2,247,472 in which a suction
cleaner is" disclosed-"Which comprises an‘ initial
?lter-cleaning nozzle mounting, connection and
driving means willbeicl'air'ned} InSéri‘al No.
484,514 the‘ continuously." driven ?lter-“cleaning
dirt separator; suction-creating meansto draw air
from "a cleaning nozzleinto thein-i-tial separator
nozzle will be claimed as "will'th'eibroad aspects
of the pressure-‘controlled valve structure; the 30 andv to remove it-thereirom, and a ?nal dirt-sepa.
rator whicnreceives‘air from the suction-creating
present application being. directed to the im
means for the purpose of'rem'ovin‘g any ~escaped
proved air-?ow controlling‘ ‘features of ‘ the ‘valve
foreign" material from» the air stream» which has
and the it mechanism which cooperates therewith.’
escaped from- th‘erinitia-l separator.‘ Mr. Bible
It is an objectiofthe present invention to pro
teaches ' the“ use of ' a‘v ?lter-cleaninginozzle which
vide a new and" improved suction‘cleaner.‘v It ‘is' 35 is adapted’ toremove'foreign‘ material from the
another object of'Tthe invention‘toprovide a new‘
?nal ?lter and to r‘eturhit directly‘ to the initial
and improved suction’ cleaner of! the type‘in‘coré‘
?lter where it is, upon the second passagel'there;
porating an initial dirt separator'and a ?nal ‘dirt
through, removed completely‘. In the ‘Bible patent
separator. A‘still further object of the invention
is to provide a suction‘ cleaner having a plurality 40 construction in order tooperate the ?lter-clean
inglnozzle it‘ is necessaryto disconnect the main
of dirt separators; the'?nalidirt'separator being
cleaning.‘- nozzlevan'd to’ attach the dusting tool“
provided with ‘a- continuously actuated cleaning
hose to the: connection ‘leadingtothe ?lter-clean_
nozzle which is provided with" azmax‘imum
ing' nozzle.-‘ The'operation'is manual and is'ac;
of ‘cleaning ‘air to-convey the foreign material to
theiinitial separator‘ whenever'theseal of the 45 complished ' at the ' election‘ of the operator.
In‘ the suction'cleaner‘ construction in accord
main nozzle of ‘the cleaner is broken. A still'
ance-‘with the present'inv'ention," means are pro
further object of the? invention is vto provide a"
suction‘ cleaner of ‘ the multiple-'7 dirt separator
vided which ‘clean ‘the r?n‘a‘l ?lter'at all times ‘and ‘
type which incorporatesrmeans‘toi prevent in
which? increase thee?ectiveness “ of that cleaning
under certaiir'icon'ditionsw These‘and'other more‘
cleaning" nozzle‘ with’ the- surface undergoing
cleaning is "broken; Pressure-actuated means‘are
lowing speci?cation and/claims and upon consid
provided which‘ serve to operate an air-?ow-con
trolling‘ valve in“ a manner; such that each time
rushes of funde'sirable non-working " cleaning “ airv 50 toa'maximum each“ time'the'sealbf the main
speci?c objects‘ will'appearupon reading therfol';
ering in connection therewith'the‘ attached drawi
lugs to which itheyirelatez
the: main “nozzle seal. is‘ broken; and the pressure
at‘ the ‘suction ~ cleaner inlet increases beyond‘ a
partially within the motor hood 6 and partially
predetermined point, the air moving power of the
within the upper end of casing I. The rotation
of the motor shaft 28 causes the tandem fans 26
and 21 to draw cleaning air in through the inlet
port 23 and to remove the cleaned air upwardly
through the inlet l8 into the fan chamber from
which it is exhausted through suitable ports 35
into a, surrounding chamber which is indicated at
3! and which will be called the ?nal ?lter cham
ber for a reason which will become apparent.
De?ning the side wall of the ?nal ?lter chamber
cleaner suction is directed from the main clean
ing nozzle and is transferred to the continuously
actuated ?lter-cleaning nozzle. A speed-reducing
mechanism connects the ?lter-cleaning nozzle
with the main driving shaft of the cleaner motor
so that the speed of movement of the ?lter-clean
ing nozzle over the ?nal dirt separator or ?lter is
relatively slow. This invention has the desirable
result not only of keeping the ?nal ?lter clean
but also of preventing the inrush of a large volume
of air into the cleaner and through the ?nal ?lter
each time the main cleaner nozzle is lifted from
the surface covering. Such rushes of air accom
plish no useful function and have the undesirable
iii and spaced inwardly from the enclosing main
casing l is a cylindrical ?lter element 32 formed
of suitable air-permeable dirt-impermeable mate
characteristic of driving foreign material into the
interstices of the ?nal ?lter thereby increasing
the back pressure of that element and making
the cleaning thereof more difficult.
Referring again to the drawings the invention
is seen to comprise a cylindrical main casing l
which seats, at its centrally apertured and ?anged
bottom plate 2, upon a supporting base 3 which
seats a removable dirt pan or container 4, the
upper peripheral edges of which are in sealed
contact with the bottom plate 2. ‘The upper end
of the cylindrical casing i is closed by a motor
hood 6 which includes an inwardly ?anged motor
supporting wall ‘I.
Positioned concentrically within the main cas
ing l is a smaller cylindrical casing 9 which is
carried by the inner ?anged‘ peripheral edge of
the bottom plate 2 of the casing I. A transverse
closure wall II divides the cylindrical casing 9
into a lower whirl chamber l2 and upper fan
rial such as ?lter cloth. Filter 32 is supported at
its lower end by a ?anged collar 33 ?xedly carried
by the casing 9. At its upper end ?lter 32 is car
ried by a shouldered portion of a centrally aper
tured and ?anged plate 34 which seats in sealing
relationship upon the lower end of the casing of
motor 29 and which is itself ?xed in spaced rela
tionship to the enclosing main casing l by means
of spiders 3% which may be integrally formed.
Collar 33 and upper plate 34 form end enclosures
i or the ?lter chamber 3| and air escaping there
from must pass outwardly through the ?lter ele
ment 32 into that space between the ?lter and
the main casing l which space is indicated by the
reference character 31 and which will be referred
30 to as the discharge chamber.
Discharge chamber 31 is closed at its upper end
by the plate 1 and at its lower end by the bottom
plate 2 of casing l and the only escape therefrom
is afforded by the apertures 38 formed in the
35 casing of motor 29 upon the opposite sides of the
chamber l3, the latter being itself divided into
a lower stage and an upper stage by a centrally
supporting wall ‘I in the hood 8. Air entering the
lower apertures 38 passes upwardly through the
motor casing and escapes from the upper aper
tures and effects a cooling of the motor in doing
with a multiplicity of ?xed guide vanes which
so which is desirable. The motor hood 6 above
function to direct the air to the central inlet 40 the plate ‘I is provided with an exhaust port 39
formed therein and which is indicated as [6. The
adapted to receive and seat a dusting tool unit
top of the fan chamber 13 is closed by cover plate
when it is desired to use the cleaner as a blowing
ll of the cylindrical casing 9 while the bottom
unit and serves at all times as the cleaner exhaust
of the fan chamber is provided with a downwardly
port. Incidentally, the driving motor 29 is pro
extending elongated inlet l8 which reaches down- »
vided with incoming power leads M which are
positioned de?ector l4. De?ector M is formed
wardly beyond the mid-portion of the whirl cham
ber i2. Vertically spaced spiders [9 within inlet
i8 support a downwardly extending rod 20 carry
ing a transverse pan-closing plate 2! at its lower .
end and a strainer 22 immediately below the lower
spider i9. Plate 2| is spaced inwardly from the
wall of casing 9 and provides a peripheral opening
through which the foreign material can drop from
the whirl chamber into the dirt pan 4 while the
strainer 22 prevents the passage upwardly into the
suction-creating fan chamber l3 of large size for
eign objects.
connected to a suitable manually operable switch
$2 to enable the operator to control the operation
of the motor and so of the entire cleaner.
The machine which has hereinbefore been de
scribed comprises a completely operative cleaner,
but one which has the inherent defect that no
means have been provided to clean the ?lter 32.
To accomplish this desirable result there is pro
vided, in accordance with applicant's invention.
an elongated nozzle 46 the length of which is
equal to the height of the ?lter element 32 and
which is adapted to make sliding contact there
The inlet of the cleaner comprises a' port 23
with. Nozzle 46 has a ?lter-contacting, opening
which is adapted to receive and seat the cleaner
or month which contacts only a limited area of
end of a dusting tool hose 5 which at its outer end
the ?lter element 32 in any one position and ac
carries a suitable cleaning nozzle Ill. Inlet 23
cordingly means are provided to move the nozzle
passes inwardly through the outer cylindrical cas
relative to the ?lter. This is accomplished by
ing I and connects directly to an inlet chamber
supporting nozzle 46 by a rotatable conduit seat
24 which opens tangentially intothe whirl cham
61 which encloses the vertical sleeve lie housing
ber iii. The construction is such that air enter
the motor shaft 28. Conduit 41 is formed at its
ing through the inlet 23 and chamber 24 enters
inner end with a downwardly facing circular seat
the whirl chamber tangentially resulting in a
which is rotatably mounted upon a supporting
circular rotary movement of the air which tends
bearing 5| carried by the similarly shaped up~
to throw the foreign material outwardly and per
wardly opening mouth of a stationary conduit 52‘
mits it to drop downwardly and into the dirt pan 4. 70 The latter conduit is mounted on the top plate ll
Within the suction-creating fan chamber I3 is
of casing 9 and extends across the top and down
positioned a two-stage fan comprising a lower
the side thereof to connect to the inlet chamber
rotary fan 26 and an upper fan 21, both carried
24 of the whirl chamber l2.
by the downwardly depending shaft 28 of a motor
It is undesirable that the ?lter-cleaning noz
29 which is carried by the wall 1 and is positioned
zle; 46. should ,1 rotatetandl move; over the i surface.»
of’ th‘ea?nalis?ltert‘ 32 Fiat. aespeed. approaching. the:
speed. of: rotation of . the . fanzorfmotdr: shaft: 26''
able between twozlpositions; that shownaini full
and dottedlinesrin: Figure 2. In the‘ full line
position. of' the. valve' 88 as illustrated in Figure ‘1
both: the‘ conduit 52 and the inlet 23‘ are fully
and accordingly‘ speedlreducingi means are pro
vided .to‘enable thermotorito‘ drive the nozzlebut
' opened to the whirl chamber l2 and-the suction
at a reducedtspeedr These? means, includingai
worm 56.’ carried byi‘the; motor. shaft‘ 28',‘ are po
present therein; created’ by the'suctionecreating >
fanunit, is effective to draw air through both
sitionedwithin axhousing allocated immediately
the ?lter-‘cleaningnozzle lit‘and through the
below the motor'zlli. Shaft-enclosing sleevea49'1'is
maincleaning nozzle It: The main volume of
worm . 5 5; and‘v extended through‘ this opening and 10 air‘ will, of course; be drawn through the main
nozzle’ It; In‘ the dotted line position of the‘valve
into. engagement. with theworm '56‘1is a gear'59
iHFlgllT€€2j the closed-port position, the forward
carriedi'bysa transverse horizontal jack shaft'?'l'
curved wall thereof ‘has swung into closing re-‘
which‘ is ' itself " rotatably :mounted in bearings 631"‘
provided" with: a. slotelik'e opening 583 adjacent
lationship to: the inlet'port 23 ‘and the ?ow‘of'
carried by brackets 62' supported- from the‘ top
wall‘ of the‘ housing-51; Shaft'tiiiitself carries 15' air therethrough isi cut‘ off with the exception
of a small: leakage flow which‘ is permitted‘
a worm 64‘ at‘ a poin-t'spaeed from its‘ gear‘ 59
through the'leakage port 9| ‘in the valve. This
and this worm in turn meshes with a gear 66‘ car
leakage is necessary in order that, when the noz
ried by a second and vertical jack shaft? 67.
zler i6 is again sealed‘ with a working surface,
Shaft‘ Gl'is rotatably mounted "in bearings 68‘car 20 there
will be‘ su?icient suction within the inlet
rie'diin the‘upper‘and-llower walls'of housing 5?’
23 and‘attach'ed hose. 5 and nozzle It to‘eifect a
and“is‘continuously-rotated. A gear 69 is ?xedly
reduction in pressure;
connected to shaft‘ El‘ nearits lower end and
Connecting the‘ bellows 8i and the inlet 23 in
transmits the ‘continuous'dri-ving force'from sh'aft
order that'the» pressure in the latter can be ef
?l’vito .a-‘large gear ‘H which‘carries a bearing 12‘
fective within the former, is an‘ air conduit 92
rotatably seating upon the sleeve 49; Gear H
clearly shown'in" Figures 1 and 2. The presence ‘
is:?xedly"connected‘tolthe conduit-seat 41 of
of this conduit insures that the pressure which‘
nozzle 416i by'means of suitable rivets-‘13; A'coil
exists within the inlet'by virtue of its connection
spring misurroun‘ds the sleever49‘v and’ exerts a
to the Whirl chamber‘ I 2- and as controlled by the
downward force upon the top‘ of (the bearing" 12
and .thereby'i forces the conduit‘ seat Ill against 30 valve'?tl will at‘allitimesbe felt within the bel
lows iii. An increase in pressure in inlet 23 reits supporting bearing 5i, a suitableshoulder- ‘it
sults in aninoreased‘pressure within the bellows
being» provided-‘J upon the sleeve (39'? to seat the
and that element expands, the pressure being
aided and assisted by the action of the coil
springs 83 at the pivot axes 84; The presence
of a reduced‘pressure in‘ the inlet 23 places a
reduced pressure within the bellows and causes
that member to contract against the action of
According: to‘ the present invention‘ means‘ are ‘
providedi to. prevent therii'lrush‘ of" air into the
cleaner which. occurs ‘when the ‘ seal of "the main
nozzle Iii .with thesurface undergoing" cleaning‘ is
broken; When .this seal isvbroken“ an: inrush 'of
air ' OCClll‘S'iWhlCll surges {through the initial '?lter,‘
the springs.
the» suction-creating‘: means- and“ into the ?nal 40
To ‘transmit the movement of the upper‘ plate
$3" of the bellows under the variations in inlet
?lter.- It'lservesgno" usefultfunction but instead
pressure there is provided a toggle 94 which‘is
accomplishes» the' objectionable‘ result’ of‘ imbed
pivotally mounted at its center to a bracket 93‘
ding¢more=?rmlyv into‘ the ?lter 32'the foreign
material l particles which are lodged" thereon. In‘ 45 supported‘from the underside of the inlet cham
ber 24. Toggle 9411s suitably connected, as by a
thisinvention means are :provided which not only
pin and slot connection, to a bracket 9'! upon the
prevent‘ thewinrush of; no-n-clea'ningair which
top p1ate83'of bellows 8i and at its upper end‘
performs: noxuseful function’: but'rwhich also turn
formed'with a'slot 93 through which extends
the effective? action "of ~ the icleanerrsuction-creat- ing means to theruseful:workiofdrawingan in--» 50 the lower right-angled end of the valve-carrying
shaft 89. The relationship such that the up
creased volume 'ofcleaningainthrough the‘?lter
ward and downward movement of the top plate
cleaning» nozzle 46;" v This s construction :will‘ now
83 of’ bellows 8| causes the toggle $4 to pivot
be described:
upon a horizontal axis and e?ects the rotation
Referring. nowrto :Figures-LZv and: 13 in‘ particu
lar there is seen to be provided“abellows-elemerit‘ 55 of the valve-carrying shaft 89 about a vertical
axis, the lower right-angled end of the ‘shaft 89
8t comprising a rig-id‘loweri wal1;82‘;? which‘is
sliding within the toggle slot 98.
rigidly secured to the peripheral. surfacevof the
The operation of the invention is as follows:
inner cylindrical casing 19-; and: a:second rigid ele- ‘
The machine having been placed in operation
ment 83 .whichiis pivotedat its ends‘upon pivot
by virtue of ‘the operator closing the manually
pins 84 carried bythe lower rigid bottom plate 82;
A flexible air-tight- accordion-pleated bellows 60 operable switch 42 the rotation of the cleaner
motor Zil'effects the rotation of the shaft 25.
member 85. is . seen to connect" plates ' 82‘? and '83,
The suction-creating fans 26 and 2? carried by
the bellows being of suitablev material. which is
the shaft 28 cause a reduced pressure withinthe
impervious to?air' and which will permit relative
whirl chamber iZ‘and air is drawn into the main
movement between =the~plates 82 and83 upon a‘
cleaning nozzle it, through the dusting tool hose
change in pressure ofthe» range which is possible
5‘, through the inlet 25;, valve chamber 24 and
within the‘suction. cleaner. At the pivot pins
84 ofithe plate-:Btare provided coil springs 86 - into the whirl chamber.
passing over a surface covering
to be
which‘ .at all times exert‘a'pivoting‘force tending
to move the plates?t‘upwardly from the ?xed ‘sta
brought into the whirl chamber where practically
tionary plate 62,‘ that is; to expand the'bellows.‘
Within theinletvalve chamber'24- between the
inlet 23 and the whirl chamber I Zlis a valve 88
?xed to a vertical rotatable shaft‘ 89 forlswinging
movement upon- a'vertical axis: Valve 88 is \mov-‘
. all of- the foreign material is separated from the
air and drops into the dirt pan 4 positioned be
low the transverse plate iii. The cleaned air
enters the fan unit i3 via‘ the centrallylocated
'in-let i8‘- an‘d'is exhausted into the ?nal filter
chamber 3! from which it escapes through the
?nal ?lter 32 into the discharge chamber 3'3.
From the latter chamber the air, now entirely
clean, escapes into the motor hood 6 via the ports
38 in the motor 29. From the interior of the
motor hood the air passes to the ambient atmos
phere through the exhaust port 39. Incidentally,
should the operator desire to use the machine as
a blower, the dusting tool hose 5 would be at
in increased cleaning effectiveness for the ?lter
cleaning nozzle 46 but additionally accomplishes
a second and important function. Were the in
creased volume of air permitted to enter the whirl
chamber l2 and to pass through the suction
creating unit into the ?nal ?lter chamber 3i and
escape therefrom through the ?lter 32, the result
would be that the force of this air moving through
the ?lter would drive the collected foreign ma
10 terial more ?rmly into the ?lter, resulting in in
tached to this port 39 rather than to the inlet 23.
creased back pressure of that element and a
At the same time that the main flow of clean
greater dii?culty in the cleaning. The operation
ing air is being drawn through the nozzle It and
dusting tool hose 5 into the inlet 23, a relatively
limited flow of air is also taking place through
of the valve,‘ therefore, has accomplished two
useful functions, and a device is provided in which
useful ?lter-cleaning action is provided at all
the conduit 52, conduit 4'! and the ?lter-clean 15 times which action increases to maximum effec
ing nozzle 46. This nozzle moves in contact with
tiveness when the main cleaning nozzle is per
the cylindrical ?lter 32 under the actuation of
forming no useful work.
mechanism within the housing 517 and the air
therethrough, which of course passes through
the ?lter 32 in the reverse direction to the main
air stream, functions to remove the foreign ma~
terial which has escaped from the initial dirt
separator 52 and which has passed into the ?nal
separator 31 to be collected on the ?lter 32.
While the flow of air through the nozzle 46 dur
ing the cleaning operation of the cleaner is
smaller than the flow of air through the main
nozzle, yet it is effective to perform cleaning
upon the ?lter 3.2 and it being possible to appor
tion the flow of air between the two nozzles by
the design of the air passageways leading thereto
I claim:
1. In a suction cleaner, an initial separator
having an inlet port, a suction-creating fan unit
to draw air through said initial dirt separator,
a motor to drive said fan unit, a ?nal dirt sepa
rator to receive air exhausted from said. fan unit,
a dirt-removing element in said ?nal dirt sepa
rator, air-conducting means'connecting said ele
ment to said initial separator to draw air through
said element at all times during normal surface
cleaning operation, a valve to close said inlet
port, and pressure-operated means to close said
port upon a predetermined increase in the pres
sure at said port.
2. In a suction cleaner, a manually movable
nozzle adapted to contact a surface undergoing
cleaning, an initial separator having an inlet
So long as the operator continues to perform
connected to said nozzle, a suction-creating fan
the cleaning function with the main nozzle 53
to draw air through said initial dirt sepa
in sealing contact with the surface undergoing
rator, a motor to drive said fan unit, a ?nal
cleaning, the action will be as described and both
dirt separator to receive air exhausted from said
nozzles will perform their cleaning functions.
unit, a dirt-removing element in said ?nal
Should the operator, however, lift the main
dirt separator, means to provide a continuous
nozzle iii from the surface thereby breaking the
flow of air from said element to said initial sepa
seal of the nozzle mouth with the surface under
rator during cleaner surface-cleaning operation
going cleaning and permitting the inrush of a
and with air ?owing from said nozzle to said
large volume of air which is performing no use»
initial separator, and means to increase the flow
ful cleaning function, there will immediately re
of air from said element and to decrease the ?ow
sult an increase in the pressure which is pres
of air from said nozzle to said initial separator.
ent within the inlet 23, and this increase in pres
3. In a suction cleaner, an initial separator
sure will be immediately effective within the bel
having an inlet, a suction-creating fan unit to
lows 3| which will expand. The expansion of the
bellows with the upward movement of the rigid 50 draw air through said initial dirt separator, a
motor to drive said fan unit, a ?nal dirt sepa
plate 83 at the top thereof causes, through the
rator to receive air exhausted from said fan unit,
toggle mechanism 94, the valve 88 to move to its
a dirt-removing element in said ?nal dirt sepa
position in which it closes the inlet port 23. The
rator, an air conduit connecting said element di
entire ?ow of air through the inlet port 23 is not
rectly to said initial separator to convey air there
stopped, however, the leakage port 9! in the valve
to at all times during normal surface cleaner
88 permitting a sufficient flow of air such that
operation, a valve to close partially said inlet to
should the nozzle it] again seal with a surface
said initial separator to reduce materially the ?ow
covering, the pressure within the inlet 23 will
of air therethrough and thereby increase the
again be reduced, the pressure within the bellows
flow of air through said air conduit, and pres
Bl will be reduced, and that bellows will collapse
sure-operated means connected to said inlet to
and thereupon return the valve 88 to its original
close said valve upon a predetermined increase
position in which the main ?ow is through the
in the pressure in said inlet.
main nozzle as described above.
4. In a suction cleaner, an initial separator
With the valve 88 in the port-closing position,
however, substantially the entire air-moving 65 having an inlet, a suction-creating fan unit to
draw air through said initial dirt separator, a
power of the suction-creating fan unit is effec
motor to drive said fan unit, a ?nal dirt separa
tive to draw air through the conduit 52 leading
tor including a ?lter to receive air exhausted from
to the ?lter-cleaning nozzle 45 and so long as
said fan unit, a movable cleaning nozzle for said
this condition continues a greatly increased vol
?nal ?lter, air-conducting means connecting said
ume of air and a greatly increased suction’ is
nozzle to said initial separator to draw air
present within the nozzle and the cleaning ef
through said nozzle at all times during the nor
.feotiveness of the nozzle 46 is greatly increased.
mal surface cleaning operation, power-transmit
The closure of the valve 88‘ with respect to the
ting means connecting said nozzle to said motor
inlet port 23 to avoid an increased and non
to actuate the latter at all times during cleaner
working flow of air therethrough, results not only
and by the size of the mouths or slots at the noz
zle ends.
operation, a valve to reduce the ?ow of air
through said inlet and to increase the flow of
air through said movable cleaning nozzle, and
hausted therefrom, a separator-cleaning nozzle
for said ?nal dirt separator, air-conducting
pressure-operated means to move said valve to ,
reduce the flow of air through said inlet upon
a predetermined increase in the ?ow of air
through said inlet.
5. In a suction cleaner, a main cleaning nozzle
through which cleaning air enters at a rate var
iable with the contact of the nozzle with a sur
face being cleaned, an initial dirt separator con
nected to said nozzle, a ?nal dirt separator, "a
second cleaning nozzle for said ?nal separator,
air-conducting means to conduct air from said
means at all times connecting said separator
cleaning nozzle to said initial dirt separator,
valve means controlling the flow of air from said
nozzles into said initial separator and arranged
to vary the air ?ow through said surface-clean
ing nozzle from a maximum to a minimum at
which air actually ?ows'and at the same time
10 to vary the ‘air ?ow through said separator-clean
ing nozzle to a maximum, and pressure-respon
sive means exposed to a point of air ?ow in said
cleaner to actuate said valve means to reduce
second nozzle continuously during normal surface 15 the flow of air through said surface-cleaning
nozzle to said minimum upon the ?ow of air
cleaning operation, suction-creating means to
therethrough exceeding said maximum by a pre;
move air through said nozzles, air-conducting
determined amount.
means and said separators, valve means to con
7. In a suction cleaner, an inlet adapted to
trol the flow of air through said nozzles, pres
sure-operated means to determine the flow of air 20 receive a dusting tool unit, an initial separator
connected to said inlet, a suction-creating unit
through said main nozzle, and means connecting
to draw air through said inlet and said initial
said pressure-operated means to said valve means
dirt separator, a motor to drive said suction
to move the latter to reduce the flow of air
creating unit, a ?nal dirt separator to receive air
through the main nozzle and to increase the ?ow
of air through the second nozzle upon the ?ow 25 exhausted from said suction-creating means, a
dirt-removing element in said ?nal dirt separa
of air through said main nozzle exceeding a pre
tor, means to provide a continuous flow of air
from said element to said initial separator dur
ing the cleaning operation of the cleaner and
zle of the type through which the ?ow of clean
ing air varies with the contact thereof with the 30 while air enters said inlet from a dusting tool
unit, and means to vary inversely the flow of
surface being cleaned, an initial dirt separator
air through said inlet from a dusting toolunit
connected to said nozzle, suction-creating means
and through said means to provide a continuous
connected to said initial separator to draw air
?ow of air from said dirt-removing element to
therethrough, a ?nal dirt separator connected
said initial separator.
to said suction-creating means to receive air ex 35
determined rate.
6. In a ‘suction cleaner, a surface-cleaning noz
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