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Dec. 31, 1946'.
c. s, HuLToN
Filed April ’7, 1945
3 Sheets-Sheet l
ö/Zar/es óï/z’zz/íofz
Dec. 31, 1946.
' Filed April 7, 1945
3 sheets-sheet 2
Dec. 31, 1946.
Filed April '7, 1945
5 Sheets-Sheet 3
Char/6s 6I /z'u/Íon
Patented Dec. 31, 1946.
- 2,413,499
Charles S. Hulton, Cincinnati, Ohio, assìg'no'r ’toV
~yi‘he Kirk & Blum Manufacturing Company,
Cincinnati, Ohio, a corporation of Ohio
Application April 7, 1945, Serial No. 587,114
9 Claims.
(Cl. 18S-36)
The present invention relates to unit dust col
lectors adapted for use in connection With one
or several dust producing machines where a large
system of dust collector trunk and branch pipes
is undesirable or unnecessary,
An object of the invention is to provide a unit
dust collector which occupies a minimum of floor
space and which may be housed under a very low
work shop ceiling.
A further object of the invention is to provide
a unit of this type which is exceptionally ei‘licient
as well as extremely compact.
and an upper compartment I6, The lower com
partment I5 houses a suitably mounted suction
fan i60 and an electric motor Il connected there-~
to. Compartment i5 is closed by a removable
panel I8 with suitable screened Ventilating slots
I9. The motor is desirably connected directly to
the fan by a shaft 2li. The outlet conduit 2l of
the fan extends vertically upwardly through a
hole in the intermediate bulkhead I3 and thence
through a registering hole in the top bulkhead iii
and upwardly therefrom to an elbow or turn 22
which connects tangentially with the circumference of the upper cylindrical portion 23 of a
A further object of the invention is to provide
centrifugal dust separator indicated generally as
a primary dust separator housed within and op
eratively connected to a simple and inexpensive 15 24. The horizontal top 25 of the centrifugal sep
arator 24 is a circular plate through which the
dust filter of large capacity whereby to usefully
air outlet 23 of said primary separator opens.
employ all of the space occupied by the device.
Plate 25 is disposed concentrically with the base
Still another object of the invention is to pro«
IU and the outlet opening 26 and also the fan
vide a device of this character that is arranged
for easy and automatic cleansing of the second 20 discharge conduit 2l are thus eccentrically posi
tioned with respect to plate 25. The primary
ary dust ñlter and for the return of accumulated
separator 24 has its dust outlet 2ï extending
secondary dust to the primary separator for ul»
timate deposit in the main waste receptacle with- '
out the necessity of shutting off the air flow
through the device.
These and other important objects are attained
by the means and'method herein described and
exempliñed in the accompanying drawings in
Fig, 1 is an elevational View of a unit embody
ing the invention.
Fig. 2 is a cross-sectional view taken on line
through a hole in the top bulkhead I`4 and its in
verted truncated conical portion 28 is rigidly
25 supported intermediate its top and bottom by
means of a truncated conical brace member 23.
It will be understood that the connections be
tween the several metal parts'may be secured by
spot Welding or other known means as desired.
30 The top bulkhead I4 is arranged to` provide a
narrow circumferential cleaning'slot 30 having
sharply inclined> side walls 3| and 32, the former
of which is provided by a downturned lip on the
casing I0 while the latter is constituted by an
opposed downturned lip or íiange on the bulk
3-3 of Fig. 2, part being broken away.
head. The bulkhead is supported from beneath
Fig. 4 is a cross-sectional vieW taken on line
and insidethe flange 32 by the top edge of wall
4-4 of Fig. 1.
33 of a cleaning channel 34 into which the slot
Fig. 5 is an enlarged, cross-sectional view taken
empties. The bottom'wall 35 of cleaning chan
on line 5-5 of Fig. 1.
Fig. 6 is a cross-sectional view taken on line 40 nel 34 is welded to the inner circumference of
base IIJ and thus forms a rigid connection to and
6_6 oí Fig. 3.
support for the top bulkhead I4. Cleaning chan
Fig. 7 is an enlarged, cross-sectional view
nel 34 is of uniform width and extends entirely
showing the mounting of a ñlter member of the
around the inside of the base. The bottom wall
Fig. 8 is a fragmental, top plan view of draw 45 35 of channel 34 inclines in both directions from
one point 36 so that the capacity of the channel
band and its clamping means forming a detail of
increases around the circumference to a directly
the invention.
opposite point where the channel 34 connects
The unit dust collector of the invention as
With a cleaning outlet port 31 from which a rec
herein embodied comprises a base I0 suitably ar
ranged for securing to the floor by means of 50 tangular pipe connectionV 38 extends outwardly
and downwardly to a rectangular valve .cham
bolts IIv passing through a base flange I2, and
ber 39 which communicates at one side `with the
said base I0 preferably takes the form of a rigid
fan casing suction inlet 4B. Anyv desired dust
cylindrical housing of -sheet metal having an in
producing machine (not shown) is connected by
termediate bulkhead I3 and top bulkhead I4 de
suitable pipe such as 4I to the opposite.'side of
ñning, within the'base, a lower compartment I5
2--2 of Fig. 1.
Fig. 3 is a cross-sectional view taken on line
valve chamber 59. A valve damper 42 is pivoted
as at 43 so that it may be selectively moved by
a hooked keeper 65 fastened on one end of the
external valve lever 44 to assume a normal posi
tion as shown in full lines in Fig, 3 wherein com
munication between cleaning channel 34 and the
suction fan is completely cut off so that the suc
tion from a waste producing machine passes
through the fan and through outlet pipe 2l and
into the primary dust separator 24 in the normal
The primary dust separator is of relatively
strap 63 and a complementary member compris
ing a link 56 pivoted at one end to a bracket Gl'
fastened on the remaining end of the strap 52.
The free moving end of link 55 is pivoted inter
mediate the ends of a lever member 5l, the end
58 of which may enter and leave the keeper 55
freely when said lever is moved to an outwardly
extending position. When the lever is pushed
to a substantially flush or parallel relation with
the strap, the keeper 55 is moved toward the
small diameter and is highly eñîcient so that all of
, bracket 58 thus drawing the ends of the strip to
the heavy materials and a. very high percentage of
the ñne dust brought in through pipe 4l will be
The end 59 of the outer ñlter or back 52 is
dropped through the dust outlet port 27 of the 15 likewise made of suitable ñlter cloth and it is
separator and into a receptacle 45 in the 4upper
desirably provided with a reenforcing patch 1B
compartment l5 of the base. In the present em
directly over the air outlet 26 from the primary
bodiment the upper compartment has a pair of
doors 45 and 4l jointly governing a large door
The operation of the device vis as follows: It
opening 48 in the upper compartment, said doors 20 will be assumed that pipe 4i is connected with a
having screen Ventilating openings 49 therein and
dust and waste producing machine which would
being hinged at the sides 50 and 5i of the open
normally be located closely adjacent the unit dust
. ing. The free edges of the doors 45 and ¿il meet
collector of the invention, and that the damper
at 52 and are retained `in closed position by a
or valve 42 is in the position shown in Fig, l
latch structure 53, the complementary parts of 25 and closing off communication between pipe 33
which are carried by the respective doors.
the present embodiment the waste receptacle 45
and valve chamber 39. When the motor Il is
energized, fan I6 will draw a large Volume of air
is a bag of heavy ñlter cloth the mouth of which
is releasably connected over the mouth of a de
at high velocity through pipe 4l through the
fan case and thence outwardly through pipe or
pending circular iiange 54 which surrounds the 30 conduit 2l into the top of centrifugal separater
dust outlet 2l. It will be noted that the dust
24. This primary separator functions in known
receptacle or bag 45 functions as a dust filter
manner to expend the energy of the dirty air
during the accumulation of waste which drops
stream in circular motion within the separator,
through dust outlet 27 of the primary separa-tor,
thus causing all heavy materials and a very high
since air may readily pass from the interior of the
percentage of the ñne dust to travel downward
bag, through the porous wall thereof, the unìllled
ly and drop out of the dust port 2l of said primary
space in upper compartment i5 and thence
separator and into the receptacle 45. The sub
through the screened slots ¿S in the doors. The
stantially clean air carrying only a small per
fan outlet pipe 2l passes through the upper com#
centage of the original ñne dust content of the
partment and as the bag 45 fills it will shape itself 40 air now passes outwardly in the direction of the
around said pipe and any other obstacles therein
solid arrows into the space between plate 25 and
and become ñrmly packed with waste as it ac»
the end 69 of the outer filter, whereupon the air
begins to pass first through the pores of end 55
As can «be best seen in Figs. 5 and 6 a pair of
and then through the pores of the entire sur
air escape conduits 55 extend from the top bulk
face area of the outer filter 62, and as said air
head i4 to the wall of base I5, these are each
enters the annular space between inner filter
provided with a screen _55 which is desirab-ly
55 and outer ñlter 62, the air also passes through
located closely adjacent the plane of the base
the pores of said inner filter 59 into the space
wall Hl. Referring again to Fig. 5, a channel
_between it and the exterior of the primary
shaped ñange 5l is secured on bulkhead .E4 im 50 separator from whence it escapes to the at
mediately adjacent the downturned flange 32.
mosphere through air escape conduits 55 and
A corresponding channel-shaped flange 58 is
screen 56. This air is thus thoroughly cleaned
secured on the bottom of plate 25. The mount
and is discharged into the room or Shop without
ing flanges 51 and 58 are concentric and of equal
any hazard to the health of the occupants.
diameter and they form means for receiving the 55
It will be appreciated that the ñne dust re
opposite ends of a tubular inner filter member 5S
maining between the filters 59 and 62, though very
which thus isolates the space between itself and
limited in quantity, will eventually accumulate
the primary separator 24 including its inlet pipe
and begin to impair the efñciency of the ñlter.
2l from the outer atmosphere except through air
That portion of the ñlter dust which drops to the
escape condiuts 55. On the outer circumference 60 slot 30 may pass into the channel 34 and accumu
of base I0 immediately adjacent the downturned
late there. When the filter is to be cleaned of
lip or flange 3l is an annular grooved iiange 50
dust, the damper 42 is moved from the position
over which the mouth portion 6I of an inverted
shown in full lines in Fig. l to the dotted line
cylindrical ñlter bag 62 is passed.
position as indicated, whereupon the suction
The mouth of the dust bag 45, the mouths at
through pipe 4l is shut off and the air is now
opposite ends of inner ñlter member 59 and mouth
caused to recirculate through the path indicated
60 of the outer ñlter member or bag 62 are re~
by broken arrows from valve chamber 39 through
tained on their respective grooved flanges by any
the fan, through pipe 2l and thence through
suitable encircling membenvwhich in an emer
' the primary separator and through the space
gency may be simply a cord (not shown) tied 170 between the filters 59 and 62 and into the chan
tightly into the groove in the preferred form.
nel 34. The air is drawn from channel 34,
The securing is eifected by a flat flexible securing
. through the port 3l and intov the by-pass pipe 38.
strap 63 of a length to accommodate the diameter
Due to the diminishing cross-section of channel
of the- selected channel ñange and provided at its
34 from its port 31 to the point 36 remote from
opposite ends with a draw clamp £4 made up of 75 the port,.the recirculatedair passes through slot
30 at uniform velocity throughout its circumfer-
separator supported on~ top of the bulkhead and
having a dust outletv at the bottom extending
downwardly through said bulkhead into the base,
said separator comprising a top plate providing
an air outlet at the top of the separator and
ence and the velocity of the recirculating air is
thus kept substantially uniform throughout the
filter. While the air is thus being recirculated
the loosely adhering dust will readily be entrained
in the recirculating air stream and again a high
percentage of that accumulated dust will be de
posited in receptacle 45 by the normal action of
the primary separator.
. overhanging a substantial portion of the bulk
head, a tubular filter member connected at its top
to said plate and atv its bottom to said bulkhead in
wardly ofY the periphery of the bulkhead and en
The inner faces of the filters become soiled 10 circling said separator in closely spaced relation,
an inverted ñlter'bag having the mouth portion
with accumulated dust represented by the small
removably secured peripherally to the periphery
percentage of material that is not removed by the
of said bulkhead and enclosing said tubular filter
primary separator. This dust within the lil-ter
member in :closely spaced relation, the air out
is desirably removed frequently enough to avoid
let of the primary separator discharging into the
impairing the efliciency of the unit.` The removal
space between said top plate and said ñlter bag
of accumulated dust in the bottom and on the
and an >elbow conduit passing in non-communi
walls of the ñlter is accomplished simply and in
cating relation through the interior of the base
an automatic manner without shutting off the
and venting the space between the exterior of
power and without shutting off the air flow from
the primary separator and the interior of the
the fan to the primary separator. With the unit
tubular filter member to the atmosphere~
in operation it is necessary only to manipulate
2. In combination a rigid casing having an in
valve 42 between its opposite limits a few times
termediate bulkhead and a top bulkhead forming
in order to clean the filter and deposit practically7
-a pair of compartments therein, a motor and fan
all of the removed dust in the dust receptacle 45.
unit mounted in‘said lower compartment, said
While the unit is in normal operation, the pipe
fan provided with an inlet rextending through the
4I and the usual hood of the connected machine
wall of, said rigid rcasing and having an outlet
beyond (not shown) account foran appreciably
>duct extendingupwardly through the bulkheads
large fraction of the total resistance in the air
of said casing, afprimary dust separator sup
flow circuit and it thus rather definitely deter
mines the number of cubic feet of air per minute 30 ported on the upper bulkhead and extending
above said rigid casing and having a dust outlet
constantly entrained in the circuit and being dis
at its bottom passing downwardly into the upper
charged to the atmosphere through 'the filter
compartment in said rigid casing, a waste recepta
walls at a given rate through each square foot
cle in the upper compartment and removably con
of filter’surfaces. When- valve t2 is closed to
nected to said dust outlet, a conduit connecting
shut off pipe 4 I, the aforesaid fraction of the total
the fan outlet with said primary dust separator,r
normal resistance is lost and the operating char
a tubular filter member supported at its top by
acteristic of the motor, fan and primary sepa
said primary separator and at its bottom with
said rigid casing and forming an air relief space
handle a proportionally greater number oi cubic
feet of air perminute. As pipe 38 was opened 40 between the primary separator and itself, an
inverted ñlter bag connected at its bottom to the
the entrained air in the unitvis recirculated and
rigid casing and disposed in outwardly spaced re
the entrained air ñows through the space be
lation to'said tubular ñlter'casing, the space be
tween the ñlter walls. The improved operating
tween the 'said filter members being in communi
characteristic or fan capacity in C. F. P. M. how- ,
ever must be satisñed by an inrush of atmospheric 45 cation withA the air outlet of said primary
air through every square foot of the filter sur
3. In combination a rigid casing having an in
faces in a matter of a second or two of time.
termediate bulkhead and a top bulkhead forming
The velocity of this inrushing air is higher and
a pair of compartments therein, a motor and fan
its direction is reversed to that of the normal
ñltering operation. Hence for a brief interval the 50 unit mounted in said lower compartment, said
ian provided with an inlet extending through the
ñlter cloth is subjected to a pressure or velocity
wall of said rigid casing and having an outlet ex
air cleaning and a slight agitation. The adhering
tending upwardly through the bulkheads of said
and lodged dust particles are thus liberated and
casing, a primary dust separator supported on
taken into the circulating air stream and a very
high percentage of this dust is taken out by the 55 the upper bulkhead and extending above said
rigid casing and having a dust outlet at its bot
primary separator. By successively opening and
tom communicating with the upper compartment
closing pipe 4I and thus alternately and auto
in said rigid casing, a conduit connecting the fan
matically changing the conditions as aforede
outlet. with said primary dust separator, a tubular
scribed a thorough automatic cleaning of the ñlter
members and the ñlter trough is effected. The 60 dust filter supported at yits top by said primary
separator and at its bottom with said rigid cas
volume of air gained cleans the filter and is
ing and forming an air relief space between the
cleaned by passing through the primary sepa
primary separator and itself, an inverted dust
rator. When the gained volume is lost by a
filter bag connected at its bottom to the rigid
return to normal operation of the unit, that loss
is in the form of cleaned air passing through 65 casing and in outwardly spaced relation to said
tubular dust ñlter member, the space between
the filters to the atmosphere.
the said dust filter being in communication with
It is to be noted that any other type of primary
the air outlet of said primary separator and a
separator may be employed in lieu of the cen
conduit extending through the top bulkhead, the
trifugal separator as illustrated, and it is further
to be noted that ¿the unit is subject to minor varia« 70 upper compartment and the outer Wall of the
rigid casing for venting the air relief space be
tions, within the spirit of the invention and the
scope of the appended claims.
tween the tubular dust filter member and the
separator to free atmosphere.
What is claimed is:
4. In a unit dust collector the combination of
.1. A unit dust collector comprising a hollow
base having a top bulkhead, a primary dust 75 a hollow rigid base having an upper compart
rator is instantly and automatically changed to
and having an air outlet at the top of said primary
dust separator, spaced concentric filters form
ing a cover for the primary dust separator and
secured at their bases to the top of said base
compartment, the space between said filters
communicating with the air outlet of the pri
ment and a lower compartment in non-com
municating relation therein, a power driven dust
collector fan in said lower compartment and hav
ing an inlet extending through the side wall of
the base casing and an outlet duct extending up
wardly through the lower and upper compart
ments, a primary dust separatorsupported on the
top of said base and having an inlet connected
mary dust separator and means comprising a
with said fan duct and having a. dust outlet com
munication between the space intermediate said
municating with the interior of the upper com
valve controlled pipe to selectively effect com
10 filters and the inlet of primary dust separator.
partment, said primary dust separator having an
air outlet at its top, a pair of relatively closely
spaced, nested dust filters extendingdownwardly
over andr encircling the primary dust collector,
the space between said dust ñlters being in free v
communication with the air outlet of the primary
dust separator, and a dust storage receptacle re
movably secured about the dust outlet of the pri
7. An air recirculating dust collector unit com
prising a primary dust separator having an air
inlet, a dust outlet and an air outlet, a pair of
spaced concentric ñlters the innermost of which
envelopes said separator and has the air outlet
passing therethrough, a dust receptacle remova
bly connected to said dust outlet, means connect
ing the filters at the bottoms thereof and form
mary dust separator within the upper base com
ing a settling channel, and means selectively con
necting the interior settling> channel with the air
5. An air recirculating unit dust collector com
prising a base compartment, a primary dust sepa
rator mounted on the top of said base compart
ment eccentrically thereof and having a dust out
let communicating with the interior of said base
compartment, and having an air outlet at the
top of said primary dust separator, a pressure
inlet of said separator.
fan outlet duct extending upwardly .through the
top of said base compartment alongside said
8. In a device of the class described the com
bination of a primary separator having an inlet,
a dust outlet at its bottom and an air outlet at
its top, a suction fan disposed below the separa
tor and having an upwardly extending outlet
duct connected with the inlet of said separator,
said ian having an inlet duct for connection with
a dust producing device, a removable waste re
separator and connecting tangentially with said .
ceptacle interposed between the fan and the
separator adjacent its top, an inner tubular filter
forming a cover for the primary dust separator
and secured at its base to said base compartment,
plate means at the top of the separator having
the air outlet thereof passing through it and peri
pherally connected with the top end of said ñl
ter, an inverted ñlter bag peripherally secured at
its mouth to the circumference of said base at the
separator and connected to the dust outlet, a set
separator and duct, a pair of spaced ñlters ex
tending upwardly from opposite sides of the set
tling channel and together forming an enclosing
cover for the separator and duct, the air outlet
top thereof, enclosing and in outwardly spaced
controlled, Icy-pass conduit connecting said chan
tling channel surrounding the bottom of the
of the separator discharging into the space be
tween the ñlters, and means comprising a valve
relation to the inner filter and the top of the 40 nel and said inlet duct of the fan.
9. In a unit dust collector the combination of
separator whereby outlet air from the separator
a power driven suction fan having an inlet duct
may be dissipated through the inner filter and
and an upwardly extending outlet duct, a pri
the filter bag, conduit means extending through
mary separator mounted alongside said outlet
the interior of the base compartment and ar
duct and labove the fan, the separator having an
ranged to vent the space within the inner tubu
inlet connected with the outlet duct of the fan
lar ñlter to the outside of the base compart
and further having a dust outlet at its bottom
ment, a removable waste receptacle within the
and an air outlet at its top, spaced filter members
base compartment and connected to the dust out
surrounding the duct and separator and enclos
let of said separator, and a power driven collector
fan housed within said base compartment con 50 ing a filter space, the air outlet of said fan dis
charging into said ñlter space, an annular set
necting with the outlet duct therein, said fan .
tling channel forming a bottom connection for
having its suction inlet extended to the exterior
said filters, a by-pass duct connecting said chan
of the compartment for connection with a clust
nel and the fan inlet duct, and a valve disposed
producing means.
at the junction of the fan inlet duct and the by
6. An air recirculating unit dust collector com
pass duct for selectively connecting the fan with
prising a base compartment,` a primary dust
said by-pass duct and said inlet duct ahead of
separator mounted on the top of said base com
partment eccentrically thereof and having an in
let for dust laden air, a dust outlet communicat
ing with the interior of said base compartment, 60
said by-pass duct.
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