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Патент USA US2122326

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June 28, 1938.
' 2,122,326
Filed June 7, 1957
2 S?eets-Sheet
Patented June 28, 1938
Fred W. Schnell, New York, N. Y.
Application June 7, 1937, Serial No. 146,914
2 ‘Claims.
My invention relates to improvements in ro
tary brushes for cleaning and polishing purposes,
and the primary object thereof is to provide a
simply constructed, light and inexpensive device
55 of this character adapted to be expeditiously
handled, effective in operation, and having a
minimum number of parts readily and inexpen
sively replaced, when desired.
To the accomplishment of the above, and other
10 objects presently appearing, a preferred embodi
ment of my invention has been illustrated in the
accompanying drawings, set forth in detail in the
following description, and de?ned in the claims
(01. 15—28)
Secured to the under side of the brush‘carrier
l3, concentrically thereof, is a ciroular'brush
assembly I’! comprising an annular bristle holder
iii, of ‘any suitable material, for an annular bristle‘
assembly I9, and a circular backing plate 20, 5
preferably of metal.
The brush assembly I‘! is secured to the carrier
l3 by means of screw bolts 2| passing upwardly
through the inner edge of the backing plate 20
into the carrier I3. An axial aperture 22 in said 10
backing plate 20 provides a clearance for the
outer end of the arbor l2 and the nut M thereof.
Intermediate the brush assembly IT and the
operating connection.
plate 6, and concentric thereto, is a circular dust
guard 23, preferably of metal, and comprising a 15
?at top 24 and a depending outwardly ?aring edge
?ange 25. The ?ange 25 extends into the plane
of the backing plate 20 and is of greater diam
eter than said plate for the passage of dust
around said plate upwardly into said guard. The 20
guard 23 is provided with a central aperture 26
Referring to the drawings by numerals, in the
illustrated embodiment thereof, my improved
said guide is clamped by a pair of nuts El, thread
appended hereto.
In said drawings:
Figure 1 is a view partly in front elevation and
partly in vertical transverse section of a rotary
brush embodying my improvements.
Figure 2 is a view in top plan.
Figure 3 is a view in perspective of the brush
brush comprises a suitable motor, designated as
25 a unit by the numeral l, the casing 2 of which is
provided on top thereof with a suitable bail-like
handle 3 for transporting the device and on the
bottom thereof with a lateral circular ?ange ti
forming a continuation of the lower end 5 of said
casing l . On the under side of the ?ange 4, and
end 5, is a circular plate 6 secured to the ?ange
ll, as by screw bolts ‘l, and having depending
therefrom axially of the same and of the arma
ture shaft of the motor l, a sleeve 9. Preferably
35 the plate 6 has a central raised portion l0 coun
tersunk in the lower end 5 of the casing 2 for
centering said plate relative to said casing before
the screws l are inserted.
The armature shaft
8 of the motor extends below the casing end
40 5 into said sleeve 9 to provide an additional bear
ing for said shaft and is bored axially, as at H,
for a purpose presently seen.
Extending from
the armature shaft 8 through and beyond the
lower end of the vsleeve 9 is an arbor l2 forming
45 part of a brush operating connection, the other
element of which is a disk-like, preferably metal,
brush carrier I3 clamped to the lower end of said
arbor l2, concentrically thereof, by a -pair of
clamping nuts it, threaded onto said arbor and
which said carrier is interposed. The
arbor I2 is secured at itsupper end in the bore
H by a pin l5 passing through said end and
through the armature shaft 8, and said arbor
extends through a bearing bushing 16 secured
55 in the lower end of the sleeve 9.
?tting over the lower end of the sleeve 9 to which
ed on to said sleeve upon opposite sides of the
top 24 of said guard. The guard 23 is secured,
adjacent its edge, to the before-mentioned plate
6 and ?ange 4 by means of bolts 23 threaded
into said plate and ?ange and extended through
the top plate 2d of the guard, nuts Zil being
threaded onto the bolts 28 upon opposite sides
of said top plate.
Extending radially from the sleeve 9, above
the guard 23 and well beyond the brush assembly
I1, is a bail-like hand grip member 30, of any
suitable material, threaded onto or otherwise
?xed on said sleeve. A strap 3! having its ends
suitably secured to the opposite ends of said
hand grip 30, respectively, to extend over the
top thereof, provides for securing the hand on the
hand grip. The strap 3! is buckled together, as
at 32, for adjustment over the hand as desired.
The usual leads 33 and St for connection to the
house circuit, or the like, are clamped alongside
the casing 2 by suitable clips 35 and extended into
a plug receptacle 36 suitably secured to the base
part of said casing 2. A suitable switch box 3i
is secured, as at 38, to the hand grip member 30
adjacent one edge of the latter to be within con
venient reach of a ?nger of the hand gripping
said hand grip member. Leads represented at 50
39, extend from the switch box 3'! to the recep
tacle 36 for a purpose which will be understood
without explanation.
The operation of my invention will, it is be
lieved, be clear from the foregoing description 55
thereof. The machine may be transported from
place to place by means of the handle 3 and
manipulated over the ?oor or other surface to be
cleaned or polished by means of either the hand
grip member 30 or both said member and the
handle 3, the latter being used for exerting down
ward pressure as desired.
At any time in the
manipulation thereof, the motor may be started
.and stopped by means of the switch represented
10 at 31, which is always within convenient reach
of a ?nger of the hand grasping the‘ hand grip
member 30. A particular advantage of the strap
3| is that it prevents the hand from slipping o?
the hand grip member 30 and vibration of the
15 hand on said member.
Manifestly the invention as described is sus
ceptible of modi?cations without departing from
the inventive concept and the right is herein
reserved to all such modi?cations falling within
the scope of the claims appended hereto.
What I claim is:
1. In a rotary ?oor brush, the combination
with a motor including a casing, and an arma
ture shaft, of a plate secured to one end of the
25 casing and having a sleeve extending ‘therefrom
axially of said shaft, a bearing in the outer end
of the sleeve, an arbor in the sleeve secured at
one end to said shaft and having its opposite end
journalled in and extending through said bear
ing, a rotary brush assembly detachably secured
on the extending end of said arbor for rotation
therewith, a circular dust guard of inverted pan
like form detachably secured to the outer end of
the sleeve, and tie bolts extending between said
plate and dust guard adjacent the edges thereof 10
to brace the guard against tilting.
2. In a rotary brush, the combination with a
motor including a casing, and an armature shaft,
said casing being provided with a sleeve extend
ing therefrom axially of said shaft, an arbor in 15
said sleeve connected at one end to the shaft and
having its opposite end extending out of the free
end of the sleeve, a rotary brush assembly secured
on the extending end of the arbor, a bar-like
hand grip» member extending radially from the 20
sleeve for guiding the brush with one hand, and
a handle secured to the other end of the casing
for applying pressure to the brush with the other
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