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Патент USA US2406931

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'-Sept. 3, 1946.
c. G. TROXLER; ‘
Filed 001;; l8,‘v 1943
7 Sheets-Sheét 1
Charles 6'. Troxler
' /¢
SfBPt- 3, 1946-
Filed ‘Oct. 18, 19:43
7 7 Sheets-Sheet 2‘
Charles 6. Troxkar
Sept. 3, 1946.
‘ Filed Oct. 18, 1945
7 Sheets-‘Sheet s _
,C'harles CiTroxler
Sept. s, 1946.
' ,
‘Filed Oct. 18, 1943
2,406,931 '
7 Sheets-Sheet 4
v (I, .
é'llarles 6'. Troxler
Sept. 3, 1946.
Filed‘ Oct. ‘18, 1943
‘ '7 Sheets-Sheet 5
56 _
/ 9
' _
Fly 8 ‘
Charles 6. Troxler
Sept. 3, 1946.
Filed Oct. 18, l9f13
7 Sheeté-Sheet 6‘
36 .
56 s4
M8. ?»7L?I hr
4ll ‘ l
i I 9
mmvrm 7
177' TX
Patented Sept. 3,1946
2,406,931 ‘
Charles G. Troxler, Canton, Ohio, assignor to The
Hoover Company, North Canton, Ohio, a cor
poration of Ohio
Application October 18, 1943, Serial No. 506,625
3 Claims. (Cl. 183_—57)
The present invention relates to an air cleaner ‘ l
for ?ltering dirt from dirt-laden air and for re
moving the accumulated dirt from the ?lter.
It has been found that the duration of efficient
operation of gasoline engines is greatly short
ing the ?lter cleaning nozzles;
Figure '7 is a fragmentary top view of the ?lter
cartridge assembly;
ened by the passage of dirt, sand and other for
eign materials into theengines, and if the engine
is not immediately overhauled and cleaned, the
mechanical parts are injured and may require
Figure 6 is a view along the line 6—6 of Figure
3 showing the motor and gear reduction for driv
Figure 8 is a side elevational view of the ?lter
cartridge assembly;
Figure 9 is a broken enlarged vertical section
along the line 9-9 of Figure 7 ;
Figure 10 is a top plan view of the ?lter clean
The purpose of this invention is to ?lter out
' ing nozzle assembly;
all foreign material from the air stream passing
Figure 11 is a broken vertical section along the
into the engine and to also clean the ?lters so
line ||-—|| of Figure 10 with parts in elevation
that it is unnecessary frequently to repair the
showing the internal construction of the ?lter
motors or replace the ?lters.
15 cleaning nozzles, and
It is an object of. the invention to provide a
Figure 12 is an enlarged horizontal section
new and improved 'air cleaning machine. An
along the line |2—-|2 of Figure 11 showing the
other object is to provide an air cleaner in which
lip construction of the ?lter cleaning nozzles.
the ?lters are constantly being cleaned during
The embodiment of the invention herein dis
the operation of the air cleaner. Another object 20 close'd comprises a cylindrical base forming a mo
is to provide a unitary ?lter having a plurality
tor-fan housing 20 on which is removably sup
of ?ltering surfaces which are removable as a
ported a ?lter housing 2| closed at its upper end
unit from the air cleaner. Still another object
with a rigidly attached cap 22 provided with a
is to provide ?lter cleaning nozzles having a plu
radially extending conduit 23 which communi
rality of inlets for cleaning a plurality of ?lters in 25 cates at its outer end 24 with the incoming dirt
one operation. Another object is to provide a
laden ambient air, and has its open inner end 25
plurality of nested cylindrical ?lters spaced apart
downwardly disposed axially of the ?lter hous- '
for movement of the nozzles therebetween to re
ing 2|. Attached to the inner end 25 of the
move the accumulated dirt from the ?lters. An
conduit 23 by means of screws 26 is a cylindrical
other object is to provide driving means ‘to ro 30 dirt inlet tube 21 which is open at both ends
tate the ?lter cleaning nozzles in annular paths
‘ and terminates shortof the lower end of the ?lter
around the ?lters. A further object is to pro
housing 2|, and forms with the wall of the latter
vide means for drawing clean air in a direction
a chamber 3|‘for receiving the dirt ?ltering car
tridge assembly 28. The chamber 3| communi
reversed to the flow of the dirt-laden air stream,
through the ?lters to clean the latter. A fur
cates with a clean air outlet conduit 2-9 removably ‘
ther object is to provide an air cleaner which is
' attached by screws 30 to the ?lter housing 2|
assembled and disassembled into a few parts, the
beneath the inlet conduit 23. The clean air out
interiors of which are easily accessible. Further
let conduit 29 is connected to a suction creating
objects and advantages of the invention will be
means not shown and to the carburetor of the
apparent from the following speci?cation and
gasoline engine, or other part of the engine, which
claims, wherein:
is to receive the cleaned air.
Figure 1 is an exterior perspective view of the
The supporting frame for the ?lter cartridge
28 is shown most clearly in Figures 3 and 7 to 9
air cleaner;
Figure 2 'is a horizonal sectional view along
and comprises concentric outer and inner cylin
the line 2-2 of Figures 1 and 3;
‘ ‘
45. drical walls 32 and, 33, respectively, joined at
their upper extreme ends by spaced radially ex
Figure 3 is a vertical sectional view along the
tending brackets 34 secured in position by rivets
line 3-4-3 of Figure 2 and illustrates the path of
the dirt-laden air being ?ltered and the scaveng
‘ 35 attached to annular radially spacer brackets
ing air for removing the accumulated dirt from
36. The inner wall 33 is in slidable removable
the ?lters;
50 contact throughout the length of the exterior
Figure 4 is an exploded perspective view of the
‘ surface of the tubular inlet 21, and the outer
wall 32 is in removable contact with the interior
major sub-assemblies of the air cleaner;
Figure 5 is a vertical section of the bearing
surface of the ?lter housing outer wall, and is
also provided in its upper peripheral portion with
supports and drive connections for rotating'the
?lter cleaning nozzles;
spaced annularly arranged openings 31.
Housed within the ?lter supporting frame are
four cylindrical concentric ?lters 38, 39, M] and
Ill. Each ?lter includes a ?ltering material 42
of cloth, or other suitable material, to ?lter out
?ne dust particles and is backed up by a per
forated metal cylinder 63. The ?lter 38 is secured
at its upper end between a pair of nested annular
channel shaped members M, and G5 and a metal
annular band 46, while the lower end is secured
Each of the nozzles 82 and 83 are identical in
construction with the exception as to the overall
nozzle lip length which depends upon the length
of the ?lters and accordingly the description of
one nozzle will apply to both. rl‘he nozzle 82 is
provided with two oppositely disposed inlets I34
and I85 which extend throughout the length of
their adjacent ?lters 38 and 39, respectively. The
nozzle inlet IE5 is formed by a pair of nested
between a pair of nested ?anged rings 4"! and 10 rectangular metal plates E95 and ml, each hav
ing an elongated opening in register to form the
48 and a metal annular band 69. The annular
nozzle lips Ida and IE8. The rectangular metal
channels Gil and 135 are af?xed to the top of the
plates I86 and EB’? have their marginal edges
?lter supporting frame by the rivets 35 and the
spread apart to receive therebetween a ?ange I I!)
?anged rings M‘ and as are secured by screws
59 to a flanged ring El permanently af?xed to 15 of a rectangular apertured resilient rubber frame
III which has its outer marginal edge clamped
the lower end of the outer cylindrical wall 32
between an apertured rectangular metal frame
of the ?lter supporting frame.
5 I2 and two spaced vertical supports i I3 and I M
The ?lter GE is secured at its upper end between
forming part- of the halves of vthe nozzle base
a pair of nested annular channel shaped mem
bers 52 and 53 and a metal annular band 54, 20 '18, and the vertical supports H3 and IIéi are
while its lower end is secured between a metal
spaced apart by three stationary brackets H5,
IIS and lil secured to the supports H3 and
annular band 55 and the annular ?ange 56 of
IM by rivets H9.
an annular bracket 51 secured by screws 58 to
In order to resiliently urge the nozzle lips I93
a ?anged ring 59 permanently attached to the
inner wall 33 of the ?lter supporting frame.
25 and IE9 against the ?lter 39, a pair of spaced
springs E20 are provided and each have one end
The ?lters 39 and All! are supported at their
supported in one of the stationary brackets H5
upper ends between the nested channels as, 45
and I H, the opposite ends of the springs are each
and 52, 53, respectively, and metal annular bands
mounted in movable brackets I2I which have a
EB and GI, respectively, while the lower ends are
supported in annular nested channels 62 and 63 30 shouldered surface I22 bearing against the resil
ient rubber frame III, and the movable frames
and annular metal bands Eli and 65, respectively.
IZI are slidably supported on a pair of tabs I23
The nested channels 62 and 63 are rigidly spaced
in the lip forming metal frame N31. The lead
and supported from the radial brackets 34 by
ing portion of the metal frame I65 is depressed
means of spaced rods t5 and screws 61, 61.
The ?lters 38, 3S and M, M de?ne therebe 35 at I26 to receive the ?lter 39 as the nozzle inlet
I95 travels around and engages the ?lter 38.
tween annular or cylindrical chambers 63 and 69,
The nozzle inlet IM is constructed similarly
respectively, for the incoming dirt-laden air in
to the nozzle inlet Hi5 and the two springs I251
dicated in Figure 3 by arrows with broken shafts.
urge the nozzle 1ips I25 and I26 into contact
The arrangement of the ?lters also de?nes a
with the ?lter 38 with the exception that the
plurality of annular or cylindrical chambers for
lower spring i?il shown in Figure 11 has its sta
the cleaned air, after the dirt-laden air has been
tionary end mounted on a rivet I2‘! in the nozzle
?ltered, as indicated in Figure 3 by arrows with
base 18. In the nozzle 83 the opposed nozzle
solid shafts, one chamber ‘I8 being between the
inlets I28 and I29 are constructed similarly to
outer wall 32 and the ?lter 38, another chamber
the nozzle inlets Hill and I65, respectively of
‘II between the ?lters 39 and M), and still another
nozzle 82.
chamber ‘I2 between the filter Ill and the inner
wall 33. All of these annular chambers for the
The nozzle assembly is rigidly mounted by its
clean air communicate with a chamber 73 above
hub 15‘ on a rotating shaft 8'! ‘which is supported
the top of the ?lter supporting frame and which
in upper and lower bearings 88 and 89 carried in
communicates with the outlet conduit 25!‘.
upper and lower spider frames Bil and Si per‘
The ?lter cartridge 28 is removably retained
manently secured to the interior of the dirty air
on the tube 2? of the ?lter housing 2| by means
inlet tube 2?. A thrust bearing 92 is rigidly se
of a plurality of leaf springs ‘M having one end ~ cured by a pin 93 to the shaft 3'! and provides a
surface abutting the lower bearing 39 to support
permanently attached to the dirt inlet tube 2'! and
their free ends resiliently receiving the bracket 55 the Weight of the nozzle assembly. A dust pro
51 which is provided with a resilient seal ‘I5 to
tecting sleeve 94 encloses the shaft 8? between
prevent leakage of dirt-laden air into the clean
the bearings 88 and 89, and the top of the upper
bearing isprotected by a dust cap 95 which con
air chamber 72. The bracket 5'! is notched at
‘E6 to receive the springs 14 and to also position
tains grease and also supports a ballle 95 to direct
one of the openings 31 in the outer wall 32 oppo 60 the incoming dirt-laden air into the dirty air in~
let tube 2?. The bottom end of the lower bear
site the clean air outlet conduit 29.
ing 89 is also protected by a dust seal‘ 9?. The
The ?lter cleaner nozzle sub-assembly indi
hub '19 of the nozzle base 18 is rigidly removably
cated generally at ‘i’? and clearly shown in Fig
attached to the shaft 81 by a nut 98 threaded onto
ures 5 and 10 to 12 includes a base ‘l3 having
a hub 79 from which radially extends hollow 65 the lower end of the shaft Bi’ and is in the form
of a captive nut permitting it to be unthreaded
arms 80 and SI, each of which terminates re
from the shaft 8‘! but is retained in a‘ collar 953
spectively in an upwardly extending nozzle 82 and
pinned to the hub '59, by means not shown, so
33 which travels in the annular chambers 88 and
that in disconnecting the nozzle assembly from
6%, respectively. The nozzle assembly is split
along a vertical median line and is formed in 70 the shaft 8'! the nut 93 will remain attached to
the nozzle assembly. The nut 98 is provided with
two halves, secured together by rivets 84 and its
two downwardly extending pins Illil which receive
base '53 is provided with a single opening 85
therebetween a driving arm I?I forming part of a
de?ned by a gasket bearing plate 86 riveted to the
nozzle driving mechanism.
bottom wall of the nozzle base and is concentric
with the hub ‘I9.
A nozzle driving electric motor I 58, best shown
in Figure 6; is suitably connected to a source of
current and is arranged horizontally in the mo
tor-fan housing 20 and has a speed reducing
mechanism including a motor pinion I5I, inter
mediate spur gear I 52‘and a nozzle drive gear I53
mounted on a shaft I54 projecting into a conduit
I42‘ and is provided at its upper end with the
driving arm I (II which is disposed between the
driving pins I00 on the nozzle ‘shaft 81. The
speed reducing mechanism rotates the nozzles 62
and 83 slowly ‘along the circumferential periph
cry of their adjacent ?lters 38, 39 and 40, 4|, re»
“of the motor, and the: dirty air inlet conduit 23 is
exposed to‘ the ambient air. The suction creating
deviceinithe engine causes the dirt-laden air,
indicated by arrows having broken shafts in Fig
ure 3, to enter the conduit 23 andtube 21 from
which it is distributed into the dirty air chambers
68 and 69.‘ The dirt-laden air contacts the ?ne
mesh?ltercloth of‘ the l?lters 38, 38, 40 and M
‘and the dirt is removed from the dirt-laden air
and accumulates on the surfaces of the ?lters
which are exposed to the dirty air chambers 68
and 69, while the cleaned air, indicated by arrows
having solid shafts, passes into the annular clean
Disposed in the motor-fan housing 20 is a hori~
air chambers ‘I0, ‘II and ‘I2 from which it passes
zontally arranged electric motor I30 suitably con 15 upwardly into the clean air collecting chamber
nected to a source of current and is supported on
‘I3 and thence into the cleaned air outlet conduit
brackets HI and has its armature shaft extended
29 to the motor being supplied with cleaned air.
-to support a fan I32 in a fan casing I33 which is
The cleaned air in the air chamber ‘I0 also passes
provided with spaced annularly arranged exhaust
through, the openings 3‘! in the outer wall 32 of
outlets I34. The fan is of a double-stage type 20 the ?lter cartridge which are arranged opposite
having movable blades I35 and I36 ahd a station—
the outlet conduit 29. ‘
ary partition I31 and vanes I38. The inlet I39
At the same time the motor I50 through its
to the fan chamber is concentric with the arma
speed reduction gears rotates the shaft 81 caus
ture shaft and is connected to a suction air pas
ing the nozzles 82 and 83 to move slowly in annu
sageway I40 formed in part by a conduit MI in 25 lar paths, the nozzle 82 rotating in the dirty air
the housing 20 and a‘conduit I42 in the top wall
chamber 68 between the ?lters 38 and 39, and
I43 of the housing‘ 20. The fan I32 creates suc
the nozzle 83 rotating in the dirty air chamber
tion to draw clean air through the ?lters 38, 39,
69 between the ?lters 40'and 4|. During the ro
40 and M into the nozzles 82 and 83 to remove
tation of the nozzles 02 and 83, the suction 'motor
the accumulated dirt from the ?lters. A running
I30 drives the fan I32 which creates suction in
seal I44 of felt, or other suitable material, is
the nozzles 82 and 83. The suction nozzle 82
mounted in an annular recess formed in the top
draws the cleaned air from the annular cham
wall I43 of the motor fan housing 20 and engages
bars 10 and ‘II through the ?lters 38 and 39 into
the metal gasket bearing plate 66 in the nozzle
the nozzle inlets I04 and I05, respectively, and
base to prevent leakage of air therebetween from 35 movement of the resilient nozzle lips along the
the ?lter housing chamber 3I. A conduit I 45 is
?lters, combined with the suction, removes the
provided for the exhaust of ventilating air from
accumulated dirt from the ?lters, as indicated by
the suction creating‘motor I30.
The ?lter housing 2I is removably supported on
arrows with dotted shafts, into the hollow in- i
terior of the nozzle assembly to convey the dirt
the motor-fan housing 20 by means of a plurality 40 through the suction air passageway I40, fan inlet
of bolts I56 having hooks I51 at one end remov
I38 and fan casing I33, from which the fan I32
ably disposed in apertured brackets I55 on the
discharges the, dirt removed from the cloth ?lters
?lter housing 2|, and the opposite ends of the
38 and 39 through the exhaust outlets I34. Simi
bolts I56 are provided with wing nuts I58 which
larly the resilient lips of the nozzle inlets I28 and
engage slotted brackets I59 receiving the bolts 45 IZSIoi the nozzle 83 engage the ?lters 40 and M,
i56 to rigidly secure the assemblies together. The
respectively, and the cleaned air passes from the
bottom cover plate I60 and the top wall I43 are
clean air chambers ‘I2 and ‘II through the ?lters
removably attached to the motor-fan housing 20
M and 40 to remove the accumulated dirt from
for access to the motors I30 and I50.
these ?lters. In fact, there is reversal of air ?ow
In order to attach the air cleaner to an engine, 50 through the ?lters 38, 39, 40 and 4| during the
or other device to which the cleaned air is to
?lter cleaning operation since the ambient dirt
be delivered, a mountingbracket I6I is welded to
laden air being cleaned passes in one direction
a split clamping band I62 which encircles the
through the ?lters, and the cleaned air in the
?lter'housing 2| and is adjustable'by means of
' opposite direction, during the ?lter cleaning oper
nut and bolt connections I63, and the mounting
bracket I6I may be attached to the engine to 55
From the foregoing it will be perceived that the
support the air cleaner thereon.
?lter housing 2I and motor-fan housing 20 are
The method of disassembling the air cleaner is
easily removably connected, that the'nozzle as
shown clearly in Figure 4 and includes loosening
sembly is removed as a unit from the ?lter hous
the wing nuts I58 to remove the bolts I56 from
the slotted brackets I58 which permits separation v60 ing by loosening the captive nut 98, that the ?l
ter cartridge 28 including the four ?lters are re
of the ?lter housing 2I and motor-fan housing
moved as a unit from the ?lter housing’ 2|, and
‘20. The captive nut 98 is then loosened from
that access to the motors I30 and I50 is had by
the shaft 81 so that the nozzle assembly can be
removed from the ?lter cartridge 28 and the shaft 65 removing the top and bottom covers I43 and I60,
respectively, of the motor-fan housing. Also each
81. The ?lter cartridge is removed from the ?lter
nozzle 82 and 83 has a pair of resilient nozzle in
housing 2I by pressing inwardly on the springs
lets to remove the accumulated dirt from the two
‘I4 and exerting a slight pull on the ?lter car
adjacent ?lters, so that all four ?lters are cleaned
tridge. From the foregoing it is seen that the
at the same time. During the ?lter cleaning op
complete air cleaner comprises but four sub-as
70 eration, cleaned air is passed through the dirty
semblies which are easily disconnected.
?lters in a direction reverse to the ?ow of the
In operation, the clean air conduit 29 is con
ambient dirt-laden air to the ?lters during re
nected to the motor which is to be supplied with
moval of dirt from the ambient dirt-laden air.
cleaned air, such as the engine carburetor, and
I claim:
also to a source of suction which may be part 75 1. An air cleaning device, comprising a bone
to discharge through said outlet, a movably
a unit in said casing for connection of said open
ings in- the ?lter supporting frame and said annu
larly spaced openings in the ?lter housing for re
movable connection with said inlet and outlet,
3. An air cleaning device, comprising a casing
mounted ?lter cleaning nozzle having opposed
nozzle inlets, each of said nozzle inlets being
for cleaned air, a tube supported in said casing
ing, having an inlet for dirt-laden air and an out
let for cleaned air adapted to be connected to a
source of suction, a plurality of spaced ?lters for
removing the dirt from said dirt-laden air prior
mounted on a ?exible diaphragm forming a part
of said nozzle, resilient means interiorly of said
nozzle and exerting a force on said diaphragms ,
having an inlet for dirt-laden air and an outlet
and open at both ends, a unitary ?lter cartridge
having a ?lter housing removably insertable in
saidcasing between said tube and the outer wall
of said casing, a plurality of concentric ?lters in
to urge said nozzle inlets into engagement with
said ?lter housing, an open frame at one end of
the adjacent ?lter during movement of said noz
said ?lter housing for supporting said concentric
zle inlets along said ?lters, and suction creating
?lters, said tube having one end connected to
means for said ?lter cleaning nozzle inlets to re
move the dirt accumulated on said spaced ?lters 15 said inlet and having its‘ opposite end open for
passage of dirt-laden air to said ?lters, said frame
during the ?ltering of the dirt-laden air.
openings for passage of air therethrough
2. An air cleaner, comprising a casing‘ having
from said ?lters, the outer wall of said ?lter hous
an inlet for dirt-laden air and an outlet for
ing having a plurality of spaced openings for pas
cleaned air, a unitary ?lter cartridge having a
?lter housing removably insertable in said casing, 20 sage of air therethrough from said ?lters, said
unitary ?lte‘r cartridge arranged as a unit in said
a plurality of concentrically arranged ?lters in
casing about said tube for connection of said
said ?lter housing, an open frame at one end of
openings in the ?lter supporting frame and said
said ?lter housing for supporting said concentric
annularly spaced openings in the ?lter housing
?lters, said frame having openings for passage of
air therethrough from said concentric ?lters, said 25 for connection with said inlet and outlet, and
means on said tube for removably supporting said
?lter housing having annularly spaced openings
unitary ?lter cartridge in said casing.
in the outer Wall thereof for passage of air there
through, said unitary ?lter cartridge arranged as -
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