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Патент USA US2119386

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May 31, 1938.
’ Filed Aug. 28, 1954
Inventor-'s :
I Oâmund Holm-Hansen;
Noble HWGT’ES ,
Patented May 3l, 1938
Osmund Holm-Hansen, Stratford, and Noble
Watts, Bridgeport, Conn., assignors to General .
Electric Company, a corporation of New York`
Application August 28, 1934,> Serial No. 741,840
9 Claims.v
Our invention relates to polishing machines
for polishing floors and the like.
An object of ` ourinvention is to provide a com
pact polishing machine which may be used under
l furniture and in otherplaces having small clear
Another ‘object of our invention is to provide
an improved arrangement for detachably fasten
ing thepolishing elements to the driving spindles.
Further objects 4and advantages of our inven
tion will become apparent as Vthe following‘de
scription proceeds.
' In the drawing Fig. 1 is a perspective .view of a
(Cl. 15-49)
is journaled in a bearing 21 whichis carried in a
bearing support 28 formed integrally with the
shell Ia.
A worm 25 is attached to the end of
the shaft 26. 'I'he plate 8_ is provided with four
integral tubular bearing supports I8, II, I2 and 5
I3 which extend vertically above and below the
plate. A bearing I4 is arranged in each o! the
bearing supports. Each bearing extends slightly
above the upper end of. the bearing support and is '
provided at its lower end with a shoulder I5 which l0
engages the lower end of the bearing support.
Four‘vertical spindles I6, I1, I8 and'I9 are jour
naled in the bearings I4. Each of the inner spin-v
dles I1 and I8 has attached to its upper end a
cone-shaped member 2l having a worm wheel 22
on its- outer‘ periphery which meshes with the
worm 25 secured to the. motor shaft 26. As the
motor shaft turns, the spindles I1 and I8 are
for thelpolishing elements; Fig.-4 is a side eleva
tion, partly in section, of the polishing' machine; ’ rotated in opposite directions. A conical shaped
20 Fig.'5 is a fragmentary plan view of the polishing cup 23 attached to the inner surface of each of
’ machine; and Fig. 6 is a fragmentary sectional »the worm wheels- 2_2 carries oil from depressions
34 in the plate 8 to the inner surface of the worm
view of the polishing machine with polishing ele
wheel from which the oil is thrown by centrifugal
mentsfor 'final polishing;
Referring _to the drawing'. the polishing ma# force through holes 24 to lubricate the worm gear
polishing machine embodying our invention; Fig.
ll 2 is an enlarged perspective view ofthe handle
and the latch for latching the handle in position;
Fig. v3 is a sectionalvicw of the driving mechanism
25 chine comprises polishing elements or brushes 2
, which are driven through reduction gearing con-À
l25. Oil slingers 20 are attached to upper ends 25
of spindles 'I6 and I9 and prevent leakage of oil
tained in an enclosed `casing .I by a horizontal around these spindles.
shaftmotor 3 attached to the rear of the casing ' , Clutch members or holders 35, 36, 31, and 38
I and extending'rearwardly vfrom the casing in for‘receiving the' polishing elements are respec
fsu _substantially the same plane as the` casing. A tively connected to the lower end of each of the 30
handle '4 is pivotally attached at 5 to the motor 3 ` spindles I6, I1, I8, and I9. Each oi these holders
comprises ametal cup 39 which is threaded'on
` for guiding the machine over a floor or other
surface to be polished. -Since there are no rolls . lthe end of the spindle and has an annulus 40 of
to support the machine,` the entire weight of the resilient material such as rubber molded around
a5 polishing machine is supported on the brushes 2 the depending rim. The inner surface oí> the
which increases the effectiveness of the polishing annulus of rubber is tapered vto provide a conicalv
' and no marks are made on theA iloor. As the 'clutch surface for frictionally _engaging the con
' motor 3 extends horizontally from the casing I,
' the polishing machine can be used under furni
. '40' ture or in other places where the vertical clear
ance is small.
lT'he casing I', In which the driving mechanism
, for the brushes is located, comprises a concave
shell _la having ridges 6 at“ the front and de
45 pending sides 41 to which a -plate 8 is secured
by sc?ewsñtting into lugsj 8. The lugs 8 are
-' disposed at ‘intervals about the‘inner surface of
Vthe depending sides 1. A gasket '33 arranged
about the edges of the plate'A -8 is compressed
ical'surface 42 ofthe polishing elements. The
outer surface Áof the rubber is cylindrical and the
outer surface of the 4rubber on holders 36 and 31 '40
frictionally engages the outer surface of the
rubber on holders 35 land 38 and forms a fricï
tion drive between the spindles .I6 and I1 and the
spindles i8 and I9 respectively. The inner con»
ical surface of the rubber Ívpr'ovides a convenient 45
clutch for holding the brushes or polishing ele
ments 2~from which the 4brushes may lbe readily
_ _
The spindles I1 and I8 are rotated in opposite .
'directions by the motor shaft 28 and the outer 150spindles I8 and I9 `are rotated in opposite direc
l - _ ‘ tothe rear side of the shell Ia by studs` 2_8 and tionsby the clutches“ and 31. Adjacent polish
¿mœgsmst 9. shoulder A9a oil the'shell . Ia and Dro
» vides Van oil-ti‘ghtjoint. The niotor 3 is attached
-extends longitudinally in substantially the same ing elemeutsare therefore driven in ‘opposite di
planeas 'the shell. 'Thef motor has a horizontal
rections. Thethreads on the spindles I6, I1, I8, -
Imi _shan :tamén extends withiatnéeasing l and and I3 are arranged'îsqghat the holders 35.38,v 55'
31, and 33 tend to tighten on the spindles as they
are rotated. As the machine is supported by the
polishing elements, this manner of rotating these
elements tends to prevent the machine from
turning on the ñoor or other surface to be pol
the disk portion 61 of the holder which is of
friction material such as rubber and molded in
tegrally with the lower end of the neck 65. The
disk portion of the holder is reinforced and main
ing la over spindles form stops which prevent
tained in a fiat condition by a metal disk 68
which is embedded therein. The inner edge 69
of the disk 68 is bent upwardly and extends into
the spindles from dropping into the inner com
the neck 65 to reinforce the connection between
partment of the casing when the casing is turned
upside down, and the clutches are unthreaded
the neck and disk portions of the holder. The
outer edge 10 of the disk 68 is turned up to pro
vide a reinforced edge. From the upper edge of
Lugs 4| which are positioned on the cas
from the spindles.
'I'he handle 4 has at its lower end arms 45
which are pivotally attached at 5 to the motor 3.
Instead of'being freely pivotable, however, the
15 handle is arranged to be latched in a number of
ñxed angular positions. This arrangement Iof
the handle allows the machine to be supported on
~the brushes and makes additional support for
the machine unnecessary. The relatively ysmall
brushes provide a narrow line of contact and per
mit wide variation in the angle of the polisher to
the floor without interfering with the operation
of the machine. `In the surface of the motor
frame, there are provided slots 43 in which a
spring-pressed- latch 44 disposed Within the
handle is adapted to> be positioned to hold the
handle in one of a number of fixed angular posi
tions. The upper ends of the arms 45 are
threaded to receive a union coupling 46 which
the neck 65 of the holder, integral rubber walls
1| ilare outwardly and upwardly to a hollow hub
12. A metal ring 13, having a serrated inner
surface 14 molded to the outside of the hub 12, 15
has a tapered outer surface which is adapted to
engage the tapered inner surface of holders 35
or 38 to complete the driving connection to the
polishing element in the same manner as the
tapered surface 42 of brushes'2. 'I'he walls 1| 20
of the holder provide a flexible universal joint
connection which allows the felt disks to be main
tained in contact with the floor through a wide
variation in the angle of the polisher to the floor.
The polishing element shown in Fig. 6 can be 25
used for sanding by substituting a sand paper
disk for the felt disk illustrated.
Although we have shown a particular embodi
ment of our invention, we do not desire to belimited to the construction described, and intend 30
in the appended claims to cover all modifications
which do not depart from the spirit and scope of
joins the arms to the handle 4. Disposed within
.the passageway formed when the arms 45 are
thus joined to the arm 4 is a split latch casing 41.
This latch casing is provided with shoulders 48 our invention.
What We claim as new and desire to secure by
which engage the arms 45 and prevent the latch
casing being moved. The latch 44 is disposed Letters Patent of the United States, is:
within the latch casing and a compression spring
l. In a polishing machine, a vertical spindle,
49 normally presses the latch downwardly into means for driving said spindle, a holder secured
engagement with one of the slots 43. A lever 50, ' to the lower end of'said spindle, said holder hav
pivoted at 5| and extending through an opening ing an annulus of resilient material with a tapered
in the latch casing 41 is provided for moving the surface, and a polishing element secured to said 40
latch out of the slots 43 against the action of . holder by frictional engagement with said tapered
vthe spring 49.
A conductor 52 adapted to he- connected to a
source of electrical supply and containing the
45 conductors 53 and 53' is introduced into the hol
low handle 4 through an opening adjacent the
switch 54.
The conductors 53 and 53' are led
through the handle 4 and connected to binding
screws 55 on opposite sides of the latch casing 41.
50 As the latch casing fits snugly within the arms 45,
the casing is cut away to provide clearance for
the conductors 53 and 53’. These conductors are
connected to the motor. The end of the handle
4 is provided with a hand grip 58 for the conven
55 ience of the operator'.
In Fig. 6, the polishing machine is shown
equipped with two polishing elements each hav
ing a felt polishing disk 6| of larger diameter
than the brushes 2 which is suitable for final
polishing. The felt disk is loosely attached to
the lower side of a rubber holder 62 by a pin 63
having a split shank which extends through the
2. In a polishing machine, a vertical spindle,
means for driving said spindle, a holder secured
to the lower end of said spindle, said holder hav
ing an annulus of resilient material, and a polish
ing element secured to said holder by frictional
engagement with the inner surface of said an
3. In a polishing machine, a vertical spindle,
means for driving said spindle, a holder secured
to the lower end of said spindle, said holder hav
ing an annulus of resilient material with a tapered
inner surface, and a polishing element having a
complementary tapered surface secured to said
holder by frictional engagement with said inner
4. In a polishing machine, a vertical spindle,
means for driving said spindle, a holder secured
to the lower end'of said spindle, and a polishing
element, said holder and said polishing element
having complementary tapered surfaces at least
center of th'e felt disk 6| and through a hole 64 l one of which is formed of'resilient material for
in the center of the‘neck portion 65 of the holder.
65 The head of the pin and the portion of the felt
disk around the head are drawn within a recess
66 in the lower side of the holder, and the upper
ends of the split shank which project above the
upper surface of the neck 65 are bent outwardly
70 to hold the pin in place. The pin 63 loosely
fastens the felt disk to the holder 62 so that the ,
holding said polishing element in said holder.
5. A polishing machine comprising` a casing 65
having two vertical spindles rotatably carried
therein, a holder secured to each of said spindles,
said holders having an annulus ofA resilient mate
rial with a tapered inner surface, the outer sur
faces of resilient material on each holder beingv in 70
frictional engagement, said holders being adapted
disk remains in position 'on the holder when the ‘ to hold a polishing element` by frictional en
machine is lifted from the floor. When the ma- ‘ gagement with said tapered surface, and. means
chine rests on ‘the floor, the felt disk is driven by for driving one of said spindles. < _
75 frictional engagementl with the lower surface ofv
6. In a polishing machine, .a vertical spindle.`
means for ldriving said spindle, a metal cup se
cured to said spindle and having a depending rim,
an annulus o’f rubber having a tapered surface
secured to said rim, and a polishing element se
ëured to said spindle by frictional engagement
with saidtapered surface. ,
7. A polishing machine comprising a casing
having ltwo vertical spindles rotatably carried
therein, a .metal cup having a depending rim se
10 cured to each of said spindles, an annulus of-rub
ber having a tapered inner surface secured to
having a hub secured to said clutch member by
vfrictional engagement with said tapered surface
and having flexible walls below said hub for per
mitting alignment of said polishing element with
the surface being polished.
9. In a polishing machine, a vertical spindle,
means for driving said spindle, a clutch member
secured to the lower end of said spindle, said
clutch memberl having an annulus of resilient
'material with a tapered surface, a vrubber holder
for a polishing disk having a hub secured to said
each of said rims, the outer surfaces of each an
clutch member by frictional engagement with
said tapered Vsurface and having a disk-shaped
a polishing element securedto each of said spin- _ portion at the lower end. and a polishing disk
dies by frictional engagement with the inner `sur
secured to said holder at the~ center and driven
face of each annulus, and means for driving one by engagement with the lower surface of the disk
of said spindles.
shaped portion of the holder, said holder having
8. In a polishing machine, a vertical spindle, flexible walls below said hub for permitting align->
means for driving said spindle, a clutch mem
ment of said polishing disk with the surface be
ber secured tothe lower end of said spindle, said ing polished.
clutch member having an annulus of resilient
nulus of rubber being in frictional engagement,
‘ material with a tapered surface, a polishing ele
ment, a rubber holder for said polishing element
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