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Патент USA US3040907

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June 26, 1962
Filed Sept. 13, 1957
77 76
nite States
Patented June 26, 1962
ing. The dome of the drum is of conical form and di
verges in the downward direction and is formed with a
?at top to which the boss 4 is secured. The plate 17 may
Max Kron, Zurich, Switzerland, assignor t0
Etablissement Mexy, Vaduz, Liechtenstein
Filed Sept. 13, 1957, Ser. No. 683,756
Claims priority, application Germany Sept. 18, 1956
6 Claims. (Cl. 210-364)
be secured to the boss 4 in any known or convenient man
ner but it is preferred that the plate be ?xed to the boss
by adhesives so that a seal is provided which prevents un
authorized dismantling of the apparatus.
The ‘cover
plate may form a name-plate or carry other information.
The dome 2 extends to a considerable distance within
This invention concerns centrifugal driers and relates
more particularly to driers for domestic use as well as for 10 the centrifugal drum and the boss 4 further increases this
use in laundries.
The object of the invention is to provide a centrifugal
drier of simple and robust construction which is simple
in use, of relatively low weight and of small bulk so that
drum ensures that the clothes to be dried are inserted in
to an annular space between the domed portion and the
The domed portion within the centrifugal
conical wall 1 and thereby the annular distribution of the
it may be readily transported from room to room and 15 clothes within the drum is assisted. Water discharge
holes 3 are provided in the centrifugal drum at the point
used where most convenient. This requirement is particu—
larly of importance in the home.
of maximum diameter, or substantially so, which is at the
Another object of the invention is to provide a drier
junction between the conical wall 1 and the dome 2. The
holes 3 are in a region in which the clothes, during cen
eliminated so that the drier may be used in ?ats without 20 triguing, are unlikely to be lodged so that drainage of
disturbing neighbours.
water through the holes will not be interfered with. More
over, the holes *3 are provided in a region representing the
According to this invention a centrifugal drier com
prises a motor-driven centrifuging drum within a housing,
maximum diameter of the wall 1 and of the dome 2 so
the drum being ?xedly mounted in relation to the driving
that there is a natural tendency for the water to be carried
motor and to the housing wherein the drier is arranged to 25 towards the discharge opening ‘3.
Water discharges from the centrifugal drum into'the
‘rotate about a substantially vertical axis and is 'so placed
or mounted on a resilient base as to be capable of oscillat
housing 7, 8 and collects in the bottom thereof. The
iiig and gyrating about said axis.
water Within the housing is drained through a tube 9
which is, for example, made of natural rubber or a syn
According to a feature of the present invention the
greater part of the weight of the drier is applied to the re
thetic resin having resilient properties so that the tube can
not be broken when the drier is transported from one
silient base in the region of said axis and, according to
another feature of the invention, the margin of the hous
place to another. The tube 9, however, is preferably
ing engages said resilient base so that a relatively small
readily detachable from the housing so that it can be re
placed if desired. To this end the tube 9 is formed with
part of the weight of the drier is applied to the base
in which disturbances due to vibration are reduced or
through said margin.
It is preferred that the driving motor is beneath the
a rim having an annular recess so that the rim can be
ing the central support for the drier.
A practical application of the present invention will
now be described, byway of example only, with reference
to the accompanying drawings whereof the single FIG
forced into a hole in the bottom 8, the marginal edge of
the bottom around the hole entering the annular recess.
This assembly is relatively cheap so that the manufactur
ing costs of the drier are kept down. An extension pipe
may readily be ?tted to the tube 9 and to prevent the pipe
from inadvertently coming away from the tube the latter
is formed, at its outer end, with an inwardly directed lip
URE is a vertical sectional elevation of a centrifugal drier
20 to engage a shoulder in the pipe.
housing and projects therefrom so that it rests on the re
silient base, the motor being on said vertical axis and form
according to the invention.
Referring to the drawings: the drier comprises a drum,
having a side wall '1 and a bottom wall 2, and arranged
>within a housing, the drum being driven by an electric
motor 5 which is carried by the housing. The drum 1, 2
is ?xedly mounted on the motor 5 and thus is ?xed in re
lation to the housing which carries the motor.
The housing is in two parts comprising a main side wall
7 and a bottom portion 8, the two parts being joined to~
gether as at'13.
The side wall 7 is of convex form on
the outside while the bottom 8 of the housing is formed
with a dome which extends to within the housing, the
dome being of conical outline and diverging in the down
ward direction. The driving motor ‘5 is bolted or other
wise secured to the undersurface of a flat portion of the
dome so that it lies Within the dome, the bottom of the
The overlap joint 13 between the wall 7. of the housing
and the bottom 8 is above the drain tube 9 so that mois
ture will not collect at the joint.
The portion 10 of the bottom 8 forms a water trough
with which the drainage tube 9 communicates.
A labyrinth seal 19 is formed between a downward ex
tension of the boss 4 and the top bearing of the elec
tric motor 5, the seal preventing admission of water to
the motor shaft and the bearing therefor. The labyrinth
seal .19 is a considerable distance above the discharge
holes 3 and is also a considerable distance above the
level of water which will collect in the bottom 8 of the
housing. This disposition of the seal 19 together with
the general arrangement of the bottom of the centrifugal
drum substantially prevents Water from being thrown
upwardly so that the risk of moisture entering the motor
motor projecting from beneath the lowest marginal edge 60 5 and its bearings is largely avoided.
10‘ of the housing.
The recess 11 beneath the dome of the housing is
A driving spindle 12 of the motor 5 extends upwardly
suf?ciently large as to provide a space around the elec
to within the housing and the drum is secured to the hous—
ing through the agency of a boss 4, the boss being bolted
tric motor 5 such that‘ any moisture deposited on the out
side of the motor can readily dry off. Moreover, the
to the drum and being secured to the spindle 12 by a screw
space, is such that the motor is readily accessible and
16 which lies within a recess in the boss, the recess being
-is adequately cooled. Since the electric motor 5 lies
closed by a plate 17 which protects the screw against cor
within the dome of the housing it is not exposed to view
rosion ‘and provided a smooth contour for the boss 4.
and consequently the motor casing customarily employed
The drum is in two parts and comprises a side wall 11.
and a bottom 2. The wall 1 is of conical form and di 70 with centrifugal driers as hitherto made is no longer re
verges in the downward direction and the bottom 2 is in
the form of a dome which overlies the dome of the hous
Because of the conical form of the several parts of
the housing and of the centrifugal drum it is possible to
store these parts by stacking them one within the other
so that the space occupied atthe factory or during trans
port is small. This feature is particularly important
when exporting parts of the drier for subsequent assem
The overall size of the drier is kept low by ensuring
that the space between the drum and the housing is kept
low as is evident from FIG. 1 of the accompanying draw
The motor 5 is the heaviest part of the centrifugal
ldrier and since it is arranged centrally of the drier and
at the bottom thereof the centre of gravity of the drier
is low.
when the centrifugal drier is oscillating and gyrating
about the vertical axis while in use.
While it is preferred that -the resilient base be made
of foamed rubber or synthetic resin it may, however, be
in the form of a hollow resilient member enclosing air
to form an air cushion.
Because of the low center of gravity of the centrifugal
drier the forces restoring the drier when it is oscillating
and gyrating about the vertical axis are due partly to the
10 resilient base 6 and partly because there is a natural tend
ency for the centrifugal drier to return to its undisplaced
The centrifugal drum is coaxially ?xed relative to the
housing and there is therefore no possibility of relative
The drier rests upon a resilient base comprising a 15 movement between the drum and the housing such as“
circular cushion 6 made, for example, from foamed rub
ber. Because the electric motor 5 projects beyond the
undersurface of the bottom 8 of the housing the weight
of the motor is directly applied to the centre of the cush
would result in these members coming into contact dur
ing operation. Consequently the space between the drum
and the housing may be reduced to a minimum whereby
the overall size of the drier is correspondingly reduced.
ion. The electric motor sinks into the cushion to a cer 20 This is an advantage as compared with known cen- \
tain extent and as a result of this, the portion of the
trifugal driers wherein the centrifugal drum was resilient
cushion ‘6 beneath the motor 5 is compressed, thus mak
ly mounted and therefore unless considerable clearance
ing this portion somewhat less resilient than the remain
was provided between the drum and the housing there was
der of the cushion around the outside thereof and upon
the risk that in operation the drum would come into con
which remainder the marginal edges it? of the housing 25 tact with the housing.
rest. Consequently, the marginal edges of the housing
The openings 3 pass through the overlapped edges of
are supported by the cushion with greater yieldability
the conical wall 1 and the dome 2 of the centrifugal drum.
than that with ‘which the central portion of the cushion
The discharge openings 3 weaken the drum but as they
supports the motor. The centrifugal drier is held in
are provided at the overlap which has adequate strength
position upon the cushion without having to secure the 30 it may be arranged that the wall thickness of the cen
cushion permanently to the centrifugal drier. It will
trifugal drum is reduced to a minimum without risk of
be understood that the greater part of the weight of the
weakening the drum by the discharge openings.
drier is applied to the resilient base in the region of the
The dome parts 2 and 8 of the drum and housing re
central vertical axis, a relatively small part of the weight
‘spectively are of relatively stronger material than the
of the drier being applied to the resilient base by the 35 parts 1 and 7 thereof.
housing. With this arrangement oscillating and gyrat
1 claim:
ing movements of the drier about the vertical axis are
1. A centrifuge consisting essentially of a housing, a
readily performed while ensuring that the drier is ade
quately supported by the base 6. The oscillating and
centrifuging drum within the housing positioned for rota
tion about a substantially vertical axis, said housing hav
gyrating movements referred to may be due to out of 40 ing a dome-shaped bottom which projects into the hous
balance forces produced due to the uneven distribution
ing, and the bottom of the drum having a dome overly-A
of clothes within the centrifugal drum or due to critical
ing said housing dome, a motor having a shaft and sit“
uated within and fastened to said housing dome and pro
speeds of operation. If the movements referred to be
jecting out of the bottom of said housing dome, said
come excessive the housing deforms the resilient base
drum being mounted ?xedly on the shaft of said motor, '
and there is thereby created a restoring force which en
and a resilient base having a central portion on which
sures that such movements are kept within reasonable
said motor rest and which carries the main weight of said
centrifuge, said resilient base having peripheral portions
The ability of the drier freely to oscillate and gyrate
upon the resilient base enables a lighter vand less power
on which the marginal edges of said housing rest for hold
ful electric motor to be used since the latter is not re
ing the centrifuge in the upright position with greater
yieldability than that with which said central portion
quired to resist the oscillating and gyrating movements.
supports said motor, whereby the motor forms a central
Because the electric motor 5 lies in part within the
support transmitting the greater part of the weight of the
centrifugal drier the overall height of the drier is reduced
centrifuging drum, housing and motor to said base and
and consequently the out of balance forces created by
acts as a single support point permitting gyroscopic ac
oscillating and gyrating movements of the drier are kept
low. The dome formation of the centrifugal drum, which
tion of the centrifuging drum when the centrifuge is run
is provided to accommodate the corresponding dome
ning, and a relatively small part of the weight of the
formation of the housing which in turn is provided to
centrifuging drum, housing and motor is supported on
receive the electric motor, results in an annular space
the peripheral portions of said base, the peripheral por
within the drum which ensures that clothes placed in the GO tions exerting on said housing a reaction force when un
drum will be more uniformly distributed with the drum
balancing forces tend to tip the housing during opera
than has been possible with centrifugal driers as hitherto
tion of the drum, said reaction force causing precession
made. Because of the uniform distribution of the clothes
of the axis of rotation of said drum due to said unbal
within the drier more uniform drying, under centrifugal
ancing forces.
action, is also achieved.
2. A centrifuge as claimed in claim 1, in which said
The downwardly divergent conical wall 1 of the drum
drum has openings in the wall thereof for the discharge
will prevent any tendency for the clothes-in the drum to
of water, said openings being provided near the bottom
move upwardly. Consequently the weight distribution of
edge of the drum and in the immediate vicinity of the
the clothes in the drum is kept low thereby further as
region of the drum of greatest diameter.
sisting in maintaining a low center of gravity.
3. A centrifuge as claimed in claim 1, wherein the
As shown in the FIGURE the resilient base 6 is formed
wall of the housing follows the contour of the drum and
with selectively placed cavities so that appropriate sup
is closely spaced thereto.
port is provided for the electric motor 5 and the housing
4. A centrifuge as claimed in claim 1, wherein the
regard to the restoring forces which are to be created
drum is secured to the motor shaft by a boss attached
to the top of said dome, said boss forming one element
of a shaft seal.
5. A centrifuge as claimed in claim 1, wherein said
base has regions of di?erent resilience.
6. A centrifuge according to claim 5, in Which the
base is of rubber-like material having in its under-sur
face cavities to provide said difference in resilience.
References Cited in the ?le of this patent
Hoffbauer ______ _2____- Sept. 4, 1906
Dinsmore ____________ __ Sept. 13, 1910
Clutter ______________ -_ Mar. 14, 1916
Stephens et al. _______ __ July 28, 1931
Kirby ______________ __ Aug. 13, 1957
France ______________ __ June 8, 1935
Humes ______________ __ Aug. 2, 1932
Poplawski ___________ __ Dec. 8, 1942
Tholl ______________ __ Sept. 26, l944
Clark ________________ __ Jan. 2, 1945
Kirby ______________ __ Mar. 5, 1946
Pearce ______________ __ Mar. 14, 1950
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