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Патент USA US2112285

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March 29, 1938.
D. 1_. GLASS
Filed March 9, 1936
Patented Mar. Z9, 1938
2,112,285 `
David L. Glass, North Canton, Ohio, assignor to
The Hoover Company, North Canton, Ohio, a
corporation of Ohio
Application March 9, 1936, Serial No. 67,885
6 Claims. (Cl. 15-183)
This invention relates to suction cleaners in
general and more particularly to new and novel
improvements in agitating means for a suction
cleaner. More- specifically the invention com
prises an improved brush and brush mounting
construction for a suction cleaner agitator.
The modern suction cleaner cleans by air and
and showing an agitator embodied therein;
Figure 2 is a partial longitudinal cross section
through an agltatorconstructed in accordance
with the present invention showing the remov- 5
able and reversible brush element;
by surface agitation. The surface agitation is
commonly obtained by use of a rotary agitator
Figure 3 is a view similar to Figure 2 but with
the brush element in the reversed position;
Figure 4 is a view in perspective of the brush
embodying . rigid beater elements and ilexible
element per se.
brush elements. These brush elements gradually
Referring again to the drawing, a modern suc
tion cleaner is illustrated in which the body of
the machine comprises a main casting I which
wear down with use and necessitate either re
placement or adjustment.
A preferred type of
agitator embodies a brush element which is re
versible to compensate for bristle wear. Springs
are provided in the agitator brush seat which re
tain the brush element at its maximum radial
extension. In the second or worn brush posi
tion the spring will be more expanded resulting
20 in a different and reduced spring pressure upon
the brush element. This variation in spring pres
sure is undesirable and often results in a loose,
noisy brush. In the agitator constructed in ac
cordance with the present invention, the new and
novel brush and brush seat arrangement prevents
difference in spring pressure with the brush in its
reversed position.
It is an object of the present invention to pro
vide a new and improved suction cleaner.
It is another object of the invention to pro
vide a new and improved agitator for a suction
A still further object of the invention is to pro
vide a new and improved rotary agitator embody
ing adjustable brush elements.
Still another object is the provision of an agi
tator comprising a brush seat in which is seated a
brush element which is spring-pressed into work
tion with a, portion of the nozzle wall broken away
ing position.
Still another object is the provision of a rotary
agitator for a suction cleaner in which is pro
vided a brush seat adapted to seat reversibly a
removable brush element which is so constructed
that spring pressure upon the brush element is
constant in all of its positions.
These and other more specific objects will ap
pear upon reading the following speciiication and
claims, and upon considering in connection there
with the attached drawing to which they relate.
Referring now to the drawing in which a pre
ferred embodiment of the present invention is
Figure 1 is a front view of a suction cleaner
55 constructed in accordance with the present inven
includes a nozzle 2 and a motor casing 3 and is
movably supported upon wheels 4-4 etc.
A 15
pivoted handle 5 provides means by which the
user can propel the machine.
Within the body
of the cleaner are various Working parts char
acteristic of this type of machine but which do
not directly relate to the present invention. 20
There is, however, a fan chamber E therein which
houses a suction creating fan ‘l carried by the
rotatable motor shaft 8 which extends down
wardly through the fan chamber. Within the
nozzle 2, in a common and well known manner, is
positioned a rotary agitator 9 which is suitably
connected to the shaft 3 by a power-transmitting
belt Ill.
Agitator 9 comprises a hollow cylindrical body
II rotatably mounted upon a longitudinally ex- 30
tending through-supporting shaft I2 and formed
centrally with a reduced pulley surface I3. The
ends of body I I are protected by stationary thread
guards, of which one is indicated at III, carried by
the stationary shaft I2.
Upon the surface of the agitator 9 is provided
a rigid longitudinally extending rigid beater ele
ment I5 and circumferentially spaced from this
element are one or more brush-seating channels
i6 each of -which is adapted to seat removably a 40
brush element. The opposite ends of each chan
nel I6` are open, the top of the inner end in each
case being defined by a shoulder or stop I'Ia while
the outer end in each case is deñned by a central
shoulder or stop I‘Ib and two side shoulders I‘Ic, 45
only one of the shoulders I'Ic being 4shown in
Figures 2 and 3. The height of shoulder Ila is
midway between shoulders I‘Ib and I‘lc.
Within the channel is seated a brush comprising
a rigid back I8 in which are mounted flexible bris- 50
ties I9. The back also is provided at its opposite
ends with shoulders, a narrow shoulder at one end
being indicated at 20 and a wider and lower
shoulder at the opposite end being indicated at 2 I.
The difference in height between brush shoul- 5 Ul
ders 20 and 2| is equal to the difference between
shoulders lla and I'lb, or ila and llc.
When the brush is new and the bristle length
is maximum, the unit should be positioned within
its seat i6 as illustrated in Figure 2, that is, with
the shoulder 20 underlying shoulder Ila. The
shoulder 2l at the opposite end of the brush back
froml shoulder 20 is seated under the lower
shoulders llc. When so positioned the brush back
tioned on said body and element as to vary the
extension of said element from the bottom of
said seat in the reversed positions, spring means
urging said element to retain said pair of stops
in contact, and abutments on said element to
contact said spring means in one position of said
2. In combination, a body having an elongated
seat, a surface cleaning element removably posi
10 is level and is spaced from the bottom of channel
tioned in said seat and adapted to be reversed 10
end for end, means upon said body and element
against the contacted shoulders ila and Hc by
to determine the extension of said element from
the bottom of said seat, said element extending
to different points in the reversed positions.
spring means urging said element against said 15
I6 being urged upwardly, or radially outward,
the two arms 23 and 24 of a iiat leaf spring 22
which extend longitudinally of the channel.
Between its ends and on its under side brush
back I8 is provided with a downwardly extending
shoulder or abutment 25 positioned a short dis
tance from its outer end, with the brush in its
new brush position, and with a second down
20 wardly extending shoulder or abutment 26 ex
actly at its opposite or inner end. These abut
ments have a height equal to one half the dif
ference in height between shoulders I‘lb and I'Ic,
That is, equal to the diiîerence in height between
25 shoulders 2B and 2|.` Arm 24 of the leaf spring
is curved upwardly beyond abutment 25 as illus
- trated in Figure 2 so that the two arms of the
means and toward or from which said element is
movable, and abutments upon said element so
positioned as to contact said spring in one posi
tion to compensate for the movement of said ele» l
ment from said spring upon reversal and to main
tain substantially the force exerted by said spring
3. In combination, a body having an elongated
seat, a surface cleaning element removably posi
tioned in said seat and adapted to be reversed 25
end to end to vary the height of said element
from the bottom of said seat, means determining
the position of said »element in said seat in the
reversed positions, resilient means contacting said
element and urging the latter outwardly in said 30
seat, said element being spaced at different dis
tances from nsaid resilient means in the reversed
spring 22 contact the brush back i8 at the same
distance above the bottom of the brush channel
30 and at the sides of the abutments described.
With the brush in the reversed, or worn brush>
position, as illustrated in Figure 3, shoulder 2|
seats under seat shoulder l'la while narrow shoul
positions but being so contoured as to effect con
der 2D extends up under central shoulder I'lb.A tact with said resilient means at substantially the
same levels in the reversed positions.
35 Each end of the brush has moved radially out
ward- one-half the distance separating shoulders
4. In combination, a body having an elongated
Hb and llc. In this new position the extremities seat, a surface cleaning element adjustable in
of the spring arms 23 and 24 contact the bottom said seat to vary the extension of saidelement
of abutments 25 and 2S of the brush back. As relative to said body, spring means urging said
40 the height of each abutment is equal to the in
element outwardly relative to said body, said 40
crement by which the brush has been raised or . element being positioned closer to, or farther
moved radially outward in the channel, it is
obvious that the spring arms 23 and 24 are in
from, said spring means upon adjustment, said
element being formed with spring-contacting
the same position and are ñexed to the same ex
surfaces of different extensions so contoured as
tent as in the new brush position illustrated in
to contact said spring means at the same height 45
in said seat to effect a constant deflection in said
Figure 2.
The brush back may be channeled centrally
on its under side, as illustrated in Figure 4, in
which event the abutments 25 and 26 are in
reality a pair of spaced abutments. They func
tion as single abutments, however, for the spring
arms 23 and 24 extend across the brush back and
Contact both sides of each abutment.
The removable brush element is inserted in the
agitator channel, removed from the channel, and
again inserted inthe reversed position, in a man
ner common to this type of agitator. To accom
plish this operation it is necessary only to depress
one end of the brush back by means of a tool,
spring in the. various positions of said element.
5. In combination, a body having an elongated
seat, a surface contacting removable element
adapted to be seated reversibly end for end in
said body, spring means on said body contacting
said> element at spaced points, and spring-con
tacting surfaces formed on the underside of
said element and adapted to contact said spring
means in reversed positions of said element and 55
of such extensions as to maintain constant force
characteristics in said spring means.
6. In a suction cleaner rotary agitator, a body,
an elongated brush seat in said body, spring
such as a screw driver, urge it longitudinally of
means in the bottom of said seat, a brush ele
the channel whereupon the opposite end of the
ment including a reversible end for end rigid
back seated in said seat and prevented from dis
placement by overlying means on said body, said
brush back becomes disengaged from the over
lying shoulder or stop of the channel and moves
outwardly permitting the entire removal of the
brush. The insertion of the brush is exactly the
reverse operation.
I claimt'
l. In combination, a body having an elongated
seat, a surface cleaning element removably po
sitioned in said seat and adapted to be reversed
end for end, pairs of cooperating stops so posi
back being positioned at diiïerent heights in said
seat in the reversed positions, and spring, means
contacting portions at diiïerent heights on said
back adapted to contact selectively said spring
means in the reversed positions of said brush to
maintain constant spring force on said back.
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