U.S. patent application number 13/239492 was filed with the patent office on 2012-02-23 for drum-type washing machine and bearing housing structure thereof.
This patent application is currently assigned to LG Electronics Inc.. Invention is credited to Jae Won Chang, Si Moon Jeon, Kyeong Hwan Kim, Hee Tae Lim, Hyun Seok Seo.
Application Number | 20120042496 13/239492 |
Document ID | / |
Family ID | 35058264 |
Filed Date | 2012-02-23 |
United States Patent
Application |
20120042496 |
Kind Code |
A1 |
Chang; Jae Won ; et
al. |
February 23, 2012 |
DRUM-TYPE WASHING MACHINE AND BEARING HOUSING STRUCTURE THEREOF
Abstract
A drum type washing machine is provided. The washing machine may
include a tub, a drum, a motor rotating the drum, bearing housings
housing bearings to support a rotation shaft, a suspension
connected to the bearing housings and a cabinet to mitigate
vibration, a bracket coupled to the bearing housings, and a gasket
installed between the bracket and the tub. Such an arrangement may
allow volumes of the tub and the drum may be increased without
increasing the volume of the cabinet.
Inventors: |
Chang; Jae Won; (Kunpo-si,
KR) ; Lim; Hee Tae; (Buchun-si, KR) ; Jeon; Si
Moon; (Seoul, KR) ; Kim; Kyeong Hwan; (Seoul,
KR) ; Seo; Hyun Seok; (Inchun-si, KR) |
Assignee: |
LG Electronics Inc.
|
Family ID: |
35058264 |
Appl. No.: |
13/239492 |
Filed: |
September 22, 2011 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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12940096 |
Nov 5, 2010 |
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13239492 |
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12198269 |
Aug 26, 2008 |
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12940096 |
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11165332 |
Jun 24, 2005 |
7607326 |
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12198269 |
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Current U.S.
Class: |
29/428 |
Current CPC
Class: |
D06F 37/269 20130101;
Y10T 29/49826 20150115; F16C 35/042 20130101; D06F 37/22
20130101 |
Class at
Publication: |
29/428 |
International
Class: |
B23P 17/04 20060101
B23P017/04 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 20, 2004 |
KR |
2004-56258 |
Claims
1. A method of assembling a drum type washing machine, the method
comprising: connecting a first end portion of a shaft to a drum;
connecting a stator to a bearing housing assembly including a
bearing housing and a bearing provided therein; inserting the shaft
connected to the drum through the bearing housing assembly, and
then connecting a rotor to a second end portion of the shaft; and
attaching a suspension to the bearing housing assembly and to a
cabinet to mount the assembled drum, shaft, bearing housing
assembly, stator and rotor to the cabinet.
2. The method of claim 1, wherein attaching a suspension to the
bearing housing assembly and to a cabinet to mount the assembled
drum, shaft, bearing housing assembly, stator and rotor to the
cabinet comprises: connecting a damper bracket to the bearing
housing assembly; and connecting a damper between the damper
bracket and the cabinet.
3. The method of claim 1, further comprising directly attaching a
tub to the cabinet.
4. The method of claim 3, wherein directly attaching a tub to the
cabinet comprises directly attaching the tub to the cabinet before
attaching the suspension to the bearing housing assembly and to the
cabinet to mount the assembled drum, shaft, bearing housing
assembly, stator and rotor to the cabinet such that the drum is
positioned within the tub when the assembled drum, shaft, bearing
housing assembly, stator and rotor are mounted to the cabinet.
5. The method of claim 4, wherein the tub is directly attached to
the cabinet independently of the suspension mounting of the
assembled drum, shaft, bearing housing assembly, stator and rotor
to the cabinet.
6. The method of claim 1, wherein connecting a stator to a bearing
housing assembly further comprises connecting a bracket to the
bearing housing assembly.
7. The method of claim 1, further comprising connecting a bracket
to a first side of the bearing housing assembly facing a tub, the
drum being positioned in the tub and the assembled drum, shaft,
bearing housing assembly, stator and rotor being suspension mounted
in the cabinet independently of the tub.
8. The method of claim 7, wherein connecting a stator to a bearing
housing assembly comprises connecting the stator to a second side
of the bearing housing assembly facing away from the tub.
9. The method of claim 8, wherein connecting a rotor to a second
end portion of the shaft further comprises positioning the rotor
surrounding the stator fixed to the second side of the bearing
housing assembly.
10. The method of claim 6, further comprising positioning a gasket
between the bracket and the tub after connecting the bracket to the
bearing housing assembly.
11. The method of claim 6, wherein connecting a stator to a bearing
housing assembly further comprises attaching a seal at an inner
circumferential surface of the bracket, surrounding a corresponding
outer circumferential surface of the shaft.
12. The method of claim 6, wherein connecting the bracket to a
bearing housing assembly comprises connecting the bracket to the
bearing housing assembly with bolts.
13. The method of claim 1, wherein connecting a stator to a bearing
housing assembly including a bearing housing and a bearing provided
therein comprises: connecting a main bearing housing and a sub
bearing housing; and connecting the stator to the sub bearing
housing.
14. The method of claim 1, wherein attaching a suspension to the
bearing housing assembly and to a cabinet comprises connecting the
suspension to the bearing assembly and then connecting the
suspension to the cabinet.
15. The method of claim 1, wherein attaching a suspension to the
bearing housing assembly and to the cabinet is carried out with the
drum assembly placed inside a tub.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation application of U.S.
application Ser. No. 12/940,096 filed Nov. 5, 2010, which is a
continuation application of U.S. application Ser. No. 12/198,269
filed Aug. 26, 2008, which is a continuation application of U.S.
application Ser. No. 11/165,332 filed Jun. 24, 2005, which claims
the benefit of Korean Application No. 2004-56258, filed Jul. 20,
2004, which are hereby incorporated by reference as if fully set
forth herein.
FIELD OF THE INVENTION
[0002] The present invention relates to a drum type washing
machine, and more particularly, to a drum type washing machine in
which a tub is directly connected to a cabinet, and a drum in the
tub and a motor for rotating the drum are supported in the cabinet
by a suspension, and a bearing housing structure thereof.
DESCRIPTION-OF THE RELATED ART
[0003] A conventional drum type washing machine, as shown in FIG.
1, includes a rectangular box-shaped cabinet 1, in which a door 2
is installed to the front side thereof, a tub 3 disposed in the
cabinet in the horizontal direction to accommodate washing water, a
spring 5 and a damper 6 for supporting the tub 3 in the cabinet 1
and for buffering shock, a drum 8 rotatably installed in the tub 3
for washing laundry, and a motor 10 installed at the rear side of
the tub 3 to rotate the drum 8.
[0004] In FIG. 1, reference numeral 21 is assigned to a gasket for
preventing the washing water from leaking between the cabinet and
the tub, and reference numerals 23 and 25 are assigned to a water
supply and a drain device, respectively.
[0005] FIG. 2 is a partially sectional perspective view of the
portion "A" in FIG. 1, and illustrates a structure in which the
motor 10 is installed at the rear sides of the drum and the tub
3.
[0006] Between the motor 10 and the drum 8, a rotation shaft 12 for
transmitting rotary power is installed to connect the motor 10 with
the drum 8, and the drum 10 includes a hub 13 installed at the rear
side thereof, to which the rotation shaft 12 is connected.
[0007] The tub 3 includes a bearing housing 14, installed at the
rear side of the tub 3, through which the rotation shaft 12
penetrates, and a bearing 15 for supporting the rotation shaft 12
is installed in the bearing housing 14.
[0008] Here, the bearing housing 14 is made of steel or aluminum,
such that stiffness sufficient to support the rotation shaft 12 can
be maintained, and is fixed to the rear side of the tub 3 via
insert molding. The bearing 15 is fixed in the bearing housing 14
by being compulsorily tightly fitted against the bearing housing
14.
[0009] The motor 10 is an abduction motor in which a stator 10S is
positioned at the center of the motor 10 and a rotor 10r is
positioned around the stator 10S, wherein the stator 10S is
assembled with and fixed to the bearing housing 14 by bolts 17 and
the rotor 10R is fixed to the end of the rotation shaft 12.
[0010] However, in the conventional drum type washing machine as
described above, since the drum 8 and the motor 10 are supported by
the tub 3, the tub 3 is supported in the cabinet 1 by the spring 5
and the damper 6, a predetermined space between the cabinet 1 and
the tub 3 is required. Thus, there is also a limit to increase the
size of the drum 8 performing washing process in the cabinet 1 with
a predetermined volume.
[0011] Moreover, in the conventional drum type washing machine,
since the drum 8, the bearing 15, and the motor 10 are vibrated
together with the tub 3, reaction force is generated by the bearing
in proportion to the vibration, and a metal bearing housing 14 is
fixed to the tub 3 via insert molding to securely fix the bearing
15 to the tub 3.
[0012] However, since sizes of the tub 3 and the bearing housing 14
must be changed when volume of the conventional drum type washing
machine is changed, the tub 3 and the bearing housing 14 cannot be
used in common, and a tub 3 and a bearing housing 14 with different
sizes must be manufactured.
SUMMARY OF THE INVENTION
[0013] Therefore, the present invention has been made in view of
the above and/or other problems, and it is an object of the present
invention to provide a drum type washing machine in which a tub is
directly installed in a cabinet and vibration elements such as a
drum and a motor are directly supported in the cabinet by a
suspension such that there is no need for a separate clearance
between the cabinet and the tub, causing an increase in the size of
the drum to maximize volume of the drum type washing machine.
[0014] It is another object of the present invention to provide a
drum type washing machine in which defective parts are conveniently
repaired or replaced when a tub or a bearing housing malfunctions,
by installing the bearing housing separately from the tub without
fixing the bearing housing to the tub by the insert-molding, and
only one of the tub and the bearing housing, which is not
applicable to the drum type washing machine having the changed
washing capacity, is selectively replaced. Thus parts can commonly
used in various drum type washing machine having different
volume.
[0015] In accordance with the present invention, the above and
other aspects can be accomplished by the provision of drum type
washing machine including a tub installed in a cabinet, a drum,
disposed in the tub, in which washing is performed, a motor
disposed at the rear side of the tub to rotate the drum, bearing
housings disposed between the drum and the motor and respectively
having bearings to support a rotation shaft, a suspension connected
to the bearing housings and the cabinet to mitigate vibration
generated during the rotation of the drum, a bracket installed to
the front sides of the bearing housings to form the rear side of
the tub, and a gasket installed between the bracket and the tub to
seal the tub and to prevent vibration from being transmitted from
the bracket to the tub.
[0016] Preferably, the tub is fixed to the cabinet such that the
front side of the tub is attached to the inner surface of the
cabinet.
[0017] The bearing housings includes a main bearing housing fixed
to the bracket, and a sub-bearing housing, coupled to the rear side
of the main bearing housing, to which a stator of the motor is
fixed.
[0018] The main bearing housing and the sub-bearing housing are
convex in opposite directions such that the central portions of the
main bearing housing and the sub-bearing housing, through which the
rotation shaft penetrates, are spaced apart from each other.
[0019] The main bearing housing and the sub-bearing housing are
made of pressed metal plates.
[0020] The main bearing housing has a semi-circular upper side
higher than a part through which the rotation shaft penetrates, and
a rectangular lower side lower than the part through which the
rotation shaft penetrates.
[0021] Preferably, the sub-bearing housing is circular.
[0022] The suspension is connected to the main bearing housing.
[0023] The bracket includes a seal member, installed at the
intermediate portion thereof, for preventing washing water from
leaking between the bracket and the rotation shaft.
[0024] The another object of the present invention is achieved by
the provision of a structure of bearing housings (76 and 78) of a
drum type washing machine including a rotation shaft penetrating
through a tub to connect a drum and a motor for driving the drum, a
main bearing housing fixed to a portion for forming the rear side
of the tub to support a rotation shaft of the motor, a sub-bearing
housing coupled with the rear side of the main bearing housing to
support the rotation shaft.
[0025] The main bearing housing and the sub-bearing housing are
convex in opposite directions such that the central portions of the
main bearing housing and the sub-bearing housing, through which the
rotation shaft penetrates, are spaced apart from each other.
[0026] Preferably, the main bearing housing and the sub-bearing
housing are made of pressed metal plates.
[0027] The bearing housings are supported on a cabinet forming the
outer appearance of the drum type washing machine by a suspension
to mitigate vibration generated during rotation of the drum.
[0028] The another object of the present invention is achieved by
the provision of a drum type washing machine including a tub
directly fixed in a cabinet, a drum, disposed in the tub, in which
washing is performed, a motor disposed at the rear side of the tub
to rotate the drum, a main bearing housing fixed to a portion for
forming the rear side of the tub to support a rotation shaft of the
motor, a sub-bearing housing coupled with the rear side of the main
bearing housing to support the rotation shaft, and a suspension
connected to the main bearing housing and the cabinet to mitigate
vibration generated during the rotation of the drum.
[0029] Moreover, in the drum type washing machine according to the
present invention, since the bearing housing is separated from the
tub instead of being fixed to the tub by the insert molding, when
one of the tub and the bearing housing malfunctions, only the
malfunctioning component must be replaced. According to the present
invention, when either the tub or the bearing housing of a drum
type washing machine malfunctions, the malfunctioning component may
be replaced using a drum or bearing housing designed for a drum
type machine of a different volume. Thus, the parts are
interchangeable among drum type washing machines with different
volumes.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] These and/or other aspects and advantages of the present
invention will become apparent and more readily appreciated from
the following description of the embodiments, taken in conjunction
with the accompanying drawings, in which:
[0031] FIG. 1 is a sectional elevation view illustrating an inner
structure of a conventional drum type washing machine;
[0032] FIG. 2 is a partially sectional perspective view of a
portion "A" in FIG. 1;
[0033] FIG. 3 is a sectional elevation view illustrating an inner
structure of a drum type washing machine according to a preferred
embodiment of the present invention;
[0034] FIG. 4 is a partially sectional perspective view
illustrating main parts of the drum type washing machine according
to the preferred embodiment of the present invention;
[0035] FIG. 5 is a perspective view illustrating main parts of the
drum type washing machine according to the preferred embodiment of
the present invention; and
[0036] FIG. 6 is a rear side view of a bearing housing installed in
the drum type washing machine according to the preferred embodiment
of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0037] Hereinafter, the preferred embodiments of the drum type
washing machine according to the present invention will be
described in detail with reference to the accompanying
drawings.
[0038] Although several embodiments of the drum type washing
machines are possible according to the present invention,
hereinafter, only the drum type washing machine according to the
preferred embodiment of the present invention will be
described.
[0039] FIGS. 3 to 6 are views illustrating the drum type washing
machine according to the preferred embodiment of the present
invention; FIG. 3 is a sectional elevation view illustrating an
inner structure of the drum type washing machine according to the
preferred embodiment of the present invention, FIG. 4 is a
partially sectional perspective view illustrating main parts of the
drum type washing machine according to the preferred embodiment of
the present invention, FIG. 5 is a perspective view illustrating
main parts of the drum type washing machine according to the
preferred embodiment of the present invention, and FIG. 6 is a rear
side view of a bearing housing.
[0040] The drum type washing machine according to the preferred
embodiment of the present invention, as shown in FIG. 3, includes a
rectangular box-shaped cabinet 50 and a tub 55 directly connected
to and installed in the cabinet 50 to accommodate washing water. In
other words, although, in the conventional drum type washing
machine, a tub is connected to a cabinet by a spring and a damper,
but in the drum type washing machine according to the preferred
embodiment of the present invention, the tub 55 is directly fixed
to the cabinet 50 without need for a damper.
[0041] As such, a drum 60, in which the tub 55 is directly
installed and the laundry is washed, and vibration elements, such
as a motor 66 for rotating the drum 60, are supported in the
cabinet 50 by a suspension 90, such that vibration generated when
the drum 60 is rotated can be reduced.
[0042] Especially, the drum 60 is connected to the motor 66 by a
rotation shaft 69 and is rotated by the motor 66. Between the drum
60 and the motor 66, a bearing housing 75 including bearings 71 and
72 for supporting the rotation shaft 69, is installed. The
suspension 90 is connected to the bearing housing 75 such that the
vibration elements, such as the drum 60, the motor 66, and the
like, are supported in the cabinet 50 by the bearing housing
75.
[0043] In front of the bearing housing 75, a bracket 80 is provided
to form the rear side of the tub 55, and a gasket 85 installed
between the bracket 80 and the rear portion of the tub 55 is
installed to prevent vibration from being transmitted from the
vibration elements to the tub 55 and to prevent water accommodated
in the tub 55 from leaking.
[0044] Main parts of the drum type washing machine according to the
preferred embodiment of the present invention, structured as
described above, will be described as follows.
[0045] Preferably, the cabinet 50 takes the shape of a rectangular
container like that of the conventional drum type washing machine,
and has a door 52 installed at the front side thereof to open and
close the tub 55.
[0046] The tub 55 includes a tub main body 56 directly fixed to the
front side of the cabinet 50, and a ring-shaped tub cover 57, which
is installed at the rear side of the tub main body 56 and includes
an intermediate part where the bracket 80 and the rear gasket 85
are positioned.
[0047] The drum 60 is supported, by connecting the rear part of the
drum 60 to the rotation shaft 69, and has a hub 65 to which the
rotation shaft 69 is connected. The drum 60 includes a plurality of
lifts 63 installed at the inner side thereof to raise and release
the laundry in the drum 60. The drum 60 further includes balancers
61 and 62 installed at the front and rear sides of the drum 60 to
balance the drum 60 during the rotation of the drum 60.
[0048] The motor 66 is an abduction motor and is mounted at the
rear side of the bearing housing 75 such that a stator 67 is
coupled with the bearing housing 75 by bolts and a rotor 68 is
coupled with the rotation shaft 69 by bolts.
[0049] Especially, the bearing housing 75, as shown in FIG. 5,
includes a main bearing housing 76 in which the bracket 80 is
fixed, and a sub-bearing housing 78 smaller than the main bearing
housing 76 and coupled with the rear side of the main bearing
housing 76 by bolts, in which the motor 66 is fixed.
[0050] Here, the main bearing housing 76 has a semi-circular upper
side higher than a part through which the rotation shaft 69
penetrates, and a rectangular lower side lower than the part
through which the rotation shaft 69 penetrates such that damper
brackets 91 and 92 of the suspension 90 are connected to the lower
side.
[0051] The circular sub-bearing housing 78 is similar in size to
the stator 67 of the motor 66.
[0052] The main bearing housing 76 and the sub-bearing housing 78
are convex in opposite directions to form a predetermined space
therebetween. Thus, since the central portions of the bearing
housings 76 and 78, through which the rotation shaft 69 penetrates,
are spaced apart from each other, the two bearings 71 and 72, which
are tightly fitted against the central portions of the bearing
housings 76 and 78, are fixed at a predetermined distance.
Moreover, the bracket 80 and the stator 67 of the motor 66 closely
contact and are fixed to the convex portions 76a and 78a of the
bearing housings 76 and 78 by bolts, respectively.
[0053] The bearing housing 75 is preferably manufactured by drawing
the convex portions 76a and 78a using a steel plate press.
[0054] Next, the bracket 80 is made of non-oxidizable synthetic
resin and prevents water from entering the bearing housing 75
through the front side of the bearing housing 75. The bracket 80
includes a water seal 83, installed at the intermediate portion
thereof and serving as a seal member, for preventing washing water
from leaking between the bracket 80 and the rotation shaft 69.
[0055] The bracket 80 includes a plurality of radial shaped or
lattice-shaped ribs 81 to reinforce the bracket 80 and bolt holes
82 to couple the bracket 80 to the bearing housing 75 using
bolts.
[0056] In FIG. 6, reference numeral 75a is assigned to bolt holes,
communicated from the bolt hole of the main bearing housing 76 and
the sub-bearing housing 78 to bolt holes 82 of the bracket 80,
through which bolts are fastened, and reference numeral 75b is
assigned to bolt holes to couple the stator 67 using bolts, and
reference numeral 75c is assigned to couple damper brackets 91 and
92 using bolts.
[0057] Meanwhile, in the suspension 90, dampers 93 and 95 are
installed between the damper brackets 91 and 92 connected to the
main bearing housing 76 and a base of the cabinet 50, in which a
main damper 93, positioned between the damper bracket 91 and the
damper 95 as seen in FIG. 3, between the damper brackets 91 and 92
and the base of the cabinet 50, is installed at an angle, and
sub-dampers 95, positioned at both sides of the main damper 93, are
vertically installed to absorb vibration generated by the vibration
elements.
[0058] Operation of the drum type washing machine having the
structure as described above according to the preferred embodiment
of the present invention will be described as follows.
[0059] According to the drum type washing machine in accordance
with the preferred embodiment of the present invention, since the
tub 55 is directly installed to the cabinet 50, the size of the tub
55 can be increased when the cabinet 50 has the same volume as that
of the cabinet in the conventional drum type washing machine. Thus,
since the drum 60 installed in the tub 55 can also be relatively
increased in size, the washing capacity of the drum type washing
machine according to the preferred embodiment of the present
invention can be increased without increase of the size of the
cabinet 50.
[0060] The assembly of the drum type washing machine according to
the preferred embodiment of the present invention will be described
with respect to the bearing housing 75 as follows. First, the main
bearing housing and the sub-bearing housing 78, in which the
bearings 71 and 72 are respectively installed, contact each other
and are assembled by bolts.
[0061] The bracket 80, in which the water seal 83 is installed, is
coupled with the front side of the assembly of the main bearing
housing 76 by bolts, and the stator 67 of the motor 66 is coupled
with the rear side of the sub-bearing housing 78 by bolts.
[0062] As such, after assembling the bracket 80, the bearing
housing 75, and the stator 67, the rotation shaft 69 connected to
the hub 62 of the drum 60 penetrates the water seal 83 of the
bracket 80, the bearings 71 and 72 of the bearing housing 75, and
the stator 67, and then the rotor 68 is coupled with an end of the
penetrating rotation shaft 69.
[0063] Meanwhile, after the suspension 90 is connected to the
bearing housing 75, the drum 60 is inserted into the rear side of
the tub 55 directly fixed to the cabinet 50 and the suspension 90
is fixed to the base of the cabinet 50, so that the bracket 80, the
bearing housing 75, and the motor 66, which are coupled with the
drum 60, are installed in the cabinet 50.
[0064] Subsequently, the tub 55 and the bracket 80 are connected to
each other via the gasket 85 so that assembly of the main parts of
the drum type washing machine according to the preferred embodiment
of the present invention is completed.
[0065] In the assembly of the drum type washing machine according
to the preferred embodiment of the present invention as described
above, since the bearing housing 75 is not installed to the tub by
insert-molding, but can be separated from the tub, the bearing
housing 75 can be installed in a drum type washing machine having a
difference volume.
[0066] Moreover, since the bracket 80 is made of synthetic resin
including plastic and is installed to the front side of the metal
bearing housing 75 such that the bracket 80 and the gasket 85 form
the rear side of the tub 55, the bearing housing 75 is not easily
eroded due to water even after extended use. Since the water seal
83 is installed at the intermediate portion of the bracket 80,
water is prevented from leaking so that the bearings 71 and 72 and
the bearing housing 75 are prevented from being damaged.
[0067] As described above, according to the drum type washing
machine of the present invention, since the tub is directly
installed to the cabinet and the vibration elements, such as the
drum, the motor, and the like, are supported on the cabinet by the
suspension, volumes of the tub and the drum can be easily increased
and the tub and the drum having the increased volumes can be
installed in the cabinet without increasing the volume of the
cabinet.
[0068] Moreover, in the drum type washing machine according to the
present invention, since the bearing housing is separated from the
tub instead of being fixed to the tub by the insert molding, when
one of the tub and the bearing housing malfunctions, only the
malfunctioning component must be replaced. According to the present
invention, when either the tub or the bearing housing of a drum
type washing machine malfunctions, the malfunctioning component may
be replaced using a drum or bearing housing designed for a drum
type machine of a different volume. Thus, the parts are
interchangeable among drum type washing machines with different
volumes.
[0069] Although the preferred embodiments of the present invention
have been disclosed for illustrative purposes, those skilled in the
art will appreciate that various modifications, additions and
substitutions are possible, without departing from the scope and
spirit of the invention as disclosed in the accompanying
claims.
[0070] The present disclosure relates to subject matter contained
in Korean Application No. 10-2004-0056258, filed on Jul. 20, 2004,
the contents of which are herein expressly incorporated by
reference in its entirety.
* * * * *