U.S. patent application number 11/260125 was filed with the patent office on 2006-08-10 for tub for washing machines.
This patent application is currently assigned to LG Electronics Inc.. Invention is credited to Byoung Soo Je.
Application Number | 20060174666 11/260125 |
Document ID | / |
Family ID | 36282656 |
Filed Date | 2006-08-10 |
United States Patent
Application |
20060174666 |
Kind Code |
A1 |
Je; Byoung Soo |
August 10, 2006 |
Tub for washing machines
Abstract
Disclosed herein is a tub for washing machines. The tub
comprises a tub body, a weight receiving part formed at the tub
body, and a balance weight integrally formed at the weight
receiving part by injection molding. Consequently, the balance
weight is integrally attached to the tub body without using
additional fixing units for fixing the balance weight to the tub
body, and therefore, the balance weight and the tub body are formed
in a simple structure.
Inventors: |
Je; Byoung Soo; (Seoul,
KR) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Assignee: |
LG Electronics Inc.
Seoul
KR
|
Family ID: |
36282656 |
Appl. No.: |
11/260125 |
Filed: |
October 28, 2005 |
Current U.S.
Class: |
68/235R ;
68/12.06; 68/23.2 |
Current CPC
Class: |
D06F 37/265
20130101 |
Class at
Publication: |
068/235.00R ;
068/023.2; 068/012.06 |
International
Class: |
D06F 33/00 20060101
D06F033/00; D06F 29/00 20060101 D06F029/00; D06F 39/00 20060101
D06F039/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 4, 2005 |
KR |
2005-10537 |
Claims
1. A tub for washing machines, comprising: a tub body; a weight
receiving part formed at the tub body; and a balance weight
integrally formed at the weight receiving part by injection
molding.
2. The tub as set forth in claim 1, wherein the balance weight is
made of a concrete material or a metal material having a low
melting point.
3. The tub as set forth in claim 1, wherein the tub body comprises:
a front tub having an inlet formed at the front surface thereof and
the rear surface of which is opened; and a rear tub attached to the
rear surface of the front tub, the weight receiving part being
formed at the front tub and/or the rear tub.
4. The tub as set forth in claim 1, wherein the weight receiving
part is formed at the outer circumferential surface of the tub
body.
5. The tub as set forth in claim 4, wherein the weight receiving
part is defined by ribs protruded from the tub body.
6. The tub as set forth in claim 5, wherein the weight receiving
part comprises: a vertical rib protruded outward from the outer
circumferential surface of the tub body while the vertical rib is
perpendicular to the outer circumferential surface of the tub body;
and a horizontal rib formed at the tip end of the vertical rib
while the horizontal rib is parallel with the outer circumferential
surface of the tub body.
7. The tub as set forth in claim 5, wherein the weight receiving
part is formed along the outer circumference of the tub body.
8. The tub as set forth in claim 7, wherein the weight receiving
part comprises: a vertical rib protruded outward from the outer
circumferential surface of the tub body along the outer
circumference of the tub body while the vertical rib is
perpendicular to the outer circumferential surface of the tub body;
and a horizontal rib protruded forward or rearward from the tip end
of the vertical rib while the horizontal rib is parallel with the
outer circumferential surface of the tub body.
9. The tub as set forth in claim 8, wherein the horizontal rib is
protruded from the tip end of the vertical rib further forward than
the front surface of the tub body.
10. The tub as set forth in claim 9, wherein the tub body is
provided at the front surface thereof with an inlet, and the tub
further comprises: a cylindrical rib disposed at the inlet of the
tub body while the cylindrical rib is protruded forward from the
tub body.
11. The tub as set forth in claim 10, further comprising: a curling
part formed at the tip end of the cylindrical rib, to which a
gasket is connected, wherein the gasket is disposed between the
inlet of the tub body and a laundry inlet/outlet hole of a cabinet
cover disposed in front of the tub body.
12. The tub as set forth in claim 10, wherein the balance weight
comprises: a first weight disposed between the vertical and
horizontal ribs and the outer circumferential surface of the tub
body; and a second weight disposed between the vertical and
cylindrical ribs and the front surface of the tub body, the second
weight being integrally molded with the first weight.
13. The tub as set forth in claim 12, further comprising: at least
one motion preventing protrusion protruded from the front surface
of the tub body for preventing motion of the balance weight.
14. The tub as set forth in claim 13, wherein the at least one
motion preventing protrusion is provided at the tip end thereof
with a separation preventing extension for preventing the balance
weight from being separated from the tub body.
15. The tub as set forth in claim 14, wherein the at least one
motion preventing protrusion comprises a plurality of motion
preventing protrusions arranged at the front surface of the tub
body in the circumferential direction while being spaced apart from
one another.
16. The tub as set forth in claim 8, wherein the tub body is
mounted in a cabinet in a shock-absorbing fashion, and the weight
receiving part has collapsed sections, which are opposite to both
side surfaces of the cabinet, the collapsed sections being
collapsed toward the tub body.
17. The tub as set forth in claim 16, wherein the tub body is
provided at the front surface thereof with an inlet, and the tub
further comprises: a cylindrical rib disposed at the inlet of the
tub body while the cylindrical rib is protruded forward from the
tub body.
18. The tub as set forth in claim 17, wherein the balance weight
comprises: a first weight disposed between the vertical and
horizontal ribs and the outer circumferential surface of the tub
body; and a second weight disposed between the vertical and
cylindrical ribs and the front surface of the tub body, the second
weight being integrally molded with the first weight.
19. The tub as set forth in claim 18, further comprising: at least
one motion preventing protrusion protruded from the front surface
of the tub body for preventing motion of the balance weight.
20. The tub as set forth in claim 19, wherein the at least one
motion preventing protrusion is provided at the tip end thereof
with a separation preventing extension for preventing the balance
weight from being separated from the tub body.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a tub for washing machines,
and, more particularly, to a tub for washing machines having a
balance weight integrally formed at the tub, which eliminates the
necessity of providing additional fixing units for fixing the
balance weight to the tub, whereby the tub and the balance weight
are formed in a simple structure.
[0003] 2. Description of the Related Art
[0004] Generally, a washing machine is a machine that removes
contaminants from clothes or bedclothes (hereinafter referred to as
"laundry") received in a drum using interaction of water and
detergent. The washing machine performs washing, rinsing,
spin-drying, and drying operations in succession to clean the
laundry.
[0005] FIG. 1 is a sectional view illustrating an example of a drum
type washing machine 1 with a conventional tub mounted therein, and
FIG. 2 is a perspective view of the conventional tub of FIG. 1
illustrating a balance weight mounted at the conventional tub.
[0006] As shown in FIGS. 1 and 2, the conventional drum type
washing machine 1 comprises: a cabinet 2 forming the outer
appearance of the drum type washing machine 1; a tub 8 horizontally
mounted in the cabinet 2 such that impact and vibration generated
from the tub 8 are effectively absorbed by springs 4 and a damper
6; a drum 10 rotatably disposed in the tub 8 for washing laundry
placed therein; a plurality of lifters 12 attached to the inside
surface of the drum 10 for lifting the laundry to a predetermined
height, when the drum 10 is rotated, such that the laundry falls
from the predetermined height due to gravity; and a motor 18
mounted at the rear of the tub 8, the motor 18 being connected to a
rotary shaft of the drum 10 via pulleys 14 and a belt 16.
[0007] At the front surface of the cabinet 2 is mounted a cabinet
cover 22 having a laundry inlet/outlet hole 20 formed at the center
thereof such that laundry can be put into or removed from the drum
10 through the laundry inlet/outlet hole 20. To the cabinet cover
22 is hingedly connected a door 24 for opening or closing the
laundry inlet/outlet hole 20.
[0008] At the upper end of the cabinet cover 22 is mounted a
control panel 28 having electric field parts 26 for controlling the
operation of the drum type washing machine 1 mounted therein.
Between the laundry inlet/outlet hole 20 and the inlet of the tub 8
is disposed a gasket 29 for reducing impact generated when the drum
10 is rotated and serving as a packing member for preventing
leakage of washing water.
[0009] In addition, a balance weight 30 is attached to the front
part of the tub 8 for eliminating unbalance in weight of the tub 8
due to the pulleys 14, the belt 16, and the motor 18.
[0010] The balance weight 30 is a heavy weight member, such as a
concrete material or iron, which is injected into a mold and then
hardened. The balance weight 30 is disposed along the front edge
part of the tub 8. The balance weight 30 is securely fixed to the
front edge part of the tub 8 by means of fixing units 32.
[0011] Each of the fixing units 32 comprises: a fixing boss 34
protruded forward from the front edge part of the tub 8; a
through-hole 36 formed at the balance weight 30 such that the
fixing boss 34 is inserted through the through-hole 36; and a
fixing bolt 38 threadedly engaged with the fixing boss 34 for
securely fixing the balance weight 30 to the front surface of the
tub 8.
[0012] When laundry is put into the drum 10 of the drum type
washing machine with the above-stated construction, and the drum
type washing machine is operated, a rotating force of the motor 18
is transmitted to the drum 10 via the pulleys 14 and the belt 16,
and therefore, the drum 10 is rotated. During the rotation of the
drum 10, washing, rinsing, and spin-drying operations are performed
in succession. At this time, back-and-forth, right-and-left, and
up-and-down vibration is generated at the tub 8 due to the
operation of the motor 18 and the drum 10. The vibration of the tub
8 is absorbed by elastic force of the springs 4 and damping force
of the damper 6.
[0013] However, the conventional drum type washing machine with the
above-stated construction has the following problems.
[0014] The balance weight 30 is separately manufactured, and is
then attached to the front surface of the tub 8 by means of the
fixing units 32. As a result, the number of parts is increased, and
the manufacturing costs of the parts are increased. Furthermore,
the balance weight attaching process is complicated.
[0015] Furthermore, the fixing bosses 34 of the fixing units 32 may
be damaged due to the vibration of the tub 8 while the drum type
washing machine 1 is operated, and therefore, the balance weight 30
may be accidentally separated from the tub 8.
[0016] Meanwhile, the tub 8 is vibrated back and forth, right and
left, and up and down in the cabinet 2 while the drum type washing
machine 1 is operated. For this reason, the drum type washing
machine 1 is designed such that there is provided sufficient space
around the tub 8 in order to prevent collision of the tub 8 with
the cabinet 2.
[0017] In the drum type washing machine 1, however, the provision
of sufficient space between the tub 8 and the cabinet cover 22 is
difficult due to the balance weight 30. If sufficient space is
provided between the tub 8 and the cabinet cover 22, the size of
the drum type washing machine 1 is increased.
[0018] FIG. 3 is a sectional view illustrating another example of a
drum type washing machine 40 with a conventional tub mounted
therein. The drum type washing machine 40 shown in FIG. 3 is a drum
type washing machine with drying function that is capable of
performing washing, rinsing, spin-drying, and drying operations in
succession.
[0019] It should be noted that the same or similar elements are
denoted by the same reference numerals even though they are
depicted in different drawings.
[0020] The conventional drum type washing machine with drying
function 40 comprises: a control panel 41 mounted at the top of the
washing machine; a drying duct 44 disposed on the tub 8 while one
end of the drying duct 44 communicates with the upper part of the
gasket 29, the drying duct 44 having a heater 42 and a blower 43
mounted therein; and a condensing duct 46, having one end connected
to the lower part of the rear surface of the tub 8 and the other
end connected to the other end of the drying duct 44, for
condensing moisture contained air circulating in the washing
machine. Other components of the drum type washing machine with
drying function 40 are identical in construction and operation to
those of the previously described drum type washing machine 1, and
therefore, a detailed description thereof will not be given.
[0021] The air condensed in the condensing duct 46 is blown by the
blower 43 and heated by the heater 42. As a result, the condensed
air is changed into hot wind. The hot wind is supplied into the
drum 10 through one end of the drying duct 44 to dry the laundry
received in the drum 10.
[0022] In the conventional drum type washing machine with drying
function 40, however, one end of the drying duct 44 as well as the
balance weight 30 is disposed between the tub 8 and the cabinet
cover 22. Consequently, the provision of an installation space for
the drying duct 44 and the balance weight 30 is much more
difficult.
SUMMARY OF THE INVENTION
[0023] Therefore, the present invention has been made in view of
the above problems, and it is an object of the present invention to
provide a tub for washing machines having a balance weight
integrally formed at the outer circumferential surface of the tub,
which eliminates the necessity of providing additional fixing units
for fixing the balance weight to the tub, whereby the tub and the
balance weight are formed in a simple structure.
[0024] It is another object of the present invention to provide a
tub for washing machines wherein the height of the balance weight
protruded forward from the front surface of the tub is reduced, and
therefore, the provision of space between the tub and a cabinet
cover is easily accomplished, and increase in size of the drum type
washing machine due to the balance weight is prevented.
[0025] In accordance with the present invention, the above and
other objects can be accomplished by the provision of a tub for
washing machines, comprising: a tub body; a weight receiving part
formed at the tub body; and a balance weight integrally formed at
the weight receiving part by injection molding.
[0026] Preferably, the balance weight is made of a concrete
material or a metal material having a low melting point.
[0027] Preferably, the tub body comprises: a front tub having an
inlet formed at the front surface thereof and the rear surface of
which is opened; and a rear tub attached to the rear surface of the
front tub, the weight receiving part being formed at the front tub
and/or the rear tub.
[0028] Preferably, the weight receiving part is formed at the outer
circumferential surface of the tub body.
[0029] Preferably, the weight receiving part is defined by ribs
protruded from the tub body.
[0030] Preferably, the weight receiving part comprises: a vertical
rib protruded outward from the outer circumferential surface of the
tub body while the vertical rib is perpendicular to the outer
circumferential surface of the tub body; and a horizontal rib
formed at the tip end of the vertical rib while the horizontal rib
is parallel with the outer circumferential surface of the tub
body.
[0031] Preferably, the weight receiving part is formed along the
outer circumference of the tub body.
[0032] Preferably, the weight receiving part comprises: a vertical
rib protruded outward from the outer circumferential surface of the
tub body along the outer circumference of the tub body while the
vertical rib is perpendicular to the outer circumferential surface
of the tub body; and a horizontal rib protruded forward or rearward
from the tip end of the vertical rib while the horizontal rib is
parallel with the outer circumferential surface of the tub
body.
[0033] Preferably, the tub body is mounted in a cabinet in a
shock-absorbing fashion, and the weight receiving part has
collapsed sections, which are opposite to both side surfaces of the
cabinet, the collapsed sections being collapsed toward the tub
body.
[0034] Preferably, the horizontal rib is protruded from the tip end
of the vertical rib further forward than the front surface of the
tub body.
[0035] Preferably, the tub body is provided at the front surface
thereof with an inlet, and the tub further comprises: a cylindrical
rib disposed at the inlet of the tub body while the cylindrical rib
is protruded forward from the tub body.
[0036] Preferably, the tub further comprises: a curling part formed
at the tip end of the cylindrical rib, to which a gasket is
connected, and the gasket is disposed between the inlet of the tub
body and a laundry inlet/outlet hole of a cabinet cover disposed in
front of the tub body.
[0037] Preferably, the balance weight comprises: a first weight
disposed between the vertical and horizontal ribs and the outer
circumferential surface of the tub body; and a second weight
disposed between the vertical and cylindrical ribs and the front
surface of the tub body, the second weight being integrally molded
with the first weight.
[0038] Preferably, the tub further comprises: at least one motion
preventing protrusion protruded from the front surface of the tub
body for preventing motion of the balance weight.
[0039] Preferably, the at least one motion preventing protrusion is
provided at the tip end thereof with a separation preventing
extension for preventing the balance weight from being separated
from the tub body.
[0040] Preferably, the at least one motion preventing protrusion
comprises a plurality of motion preventing protrusions arranged at
the front surface of the tub body in the circumferential direction
while being spaced apart from one another.
[0041] According to the present invention, the balance weight is
injected into the weight receiving part formed at one side of the
tub body, and is then hardened in the weight receiving part. As a
result, the balance weight is integrally attached to the tub body,
which eliminates the necessity of providing additional fixing units
for fixing the balance weight to the tub body, and therefore, the
balance weight and the tub are formed in a simple structure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0042] The above and other objects, features and other advantages
of the present invention will be more clearly understood from the
following detailed description taken in conjunction with the
accompanying drawings, in which:
[0043] FIG. 1 is a sectional view illustrating an example of a drum
type washing machine with a conventional tub mounted therein;
[0044] FIG. 2 is a perspective view of the conventional tub of FIG.
1 illustrating a balance weight mounted at the conventional
tub;
[0045] FIG. 3 is a sectional view illustrating another example of a
drum type washing machine with a conventional tub mounted
therein;
[0046] FIG. 4 is a sectional view illustrating a drum type washing
machine with a tub according to a first preferred embodiment of the
present invention mounted therein;
[0047] FIG. 5 is a perspective view illustrating a tub body of the
tub for drum type washing machines according to the first preferred
embodiment of the present invention;
[0048] FIG. 6 is a perspective view illustrating the tub for drum
type washing machines according to the first preferred embodiment
of the present invention;
[0049] FIG. 7 is a sectional view illustrating a drum type washing
machine with a tub according to a second preferred embodiment of
the present invention mounted therein;
[0050] FIG. 8 is a perspective view illustrating the tub for drum
type washing machines according to the second preferred embodiment
of the present invention;
[0051] FIG. 9 is a sectional view illustrating a drum type washing
machine with a tub according to a third preferred embodiment of the
present invention mounted therein; and
[0052] FIG. 10 is a perspective view illustrating the tub for drum
type washing machines according to the third preferred embodiment
of the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0053] Now, preferred embodiments of the present invention will be
described in detail with reference to the accompanying
drawings.
[0054] FIG. 4 is a sectional view illustrating a drum type washing
machine 50 with a tub according to a first preferred embodiment of
the present invention mounted therein, FIG. 5 is a perspective view
illustrating a tub body of the tub for drum type washing machines
according to the first preferred embodiment of the present
invention, FIG. 6 is a perspective view illustrating the tub for
drum type washing machines according to the first preferred
embodiment of the present invention.
[0055] As shown in FIGS. 4 to 6, the drum type washing machine 50
according to the first preferred embodiment of the present
invention comprises: a cabinet 52 forming the outer appearance of
the drum type washing machine 50; a tub body 58 horizontally
mounted in the cabinet 52 such that impact and vibration generated
from the tub 8 are effectively absorbed by springs 54 and a damper
56; a drum 60 rotatably disposed in the tub body 58 for washing
laundry placed therein; a plurality of lifters 62 attached to the
inside surface of the drum 60 for lifting the laundry to a
predetermined height, when the drum 60 is rotated, such that the
laundry falls from the predetermined height due to gravity; a motor
68 mounted at the rear of the tub body 58, the motor 68 being
connected to a rotary shaft of the drum 60 via pulleys 64 and a
belt 66; and a balance weight 80 integrally formed at the tub body
58 for eliminating unbalance in weight of the tub body 58.
[0056] At the front surface of the cabinet 52 is mounted a cabinet
cover 72 having a laundry inlet/outlet hole 70, through which
laundry can be put into or removed from the drum 60. To the cabinet
cover 72 is hingedly connected a door 74 for opening or closing the
laundry inlet/outlet hole 70.
[0057] At the upper end of the cabinet cover 72 is mounted a
control panel 78 having electric field parts 76 for controlling the
operation of the drum type washing machine 50 mounted therein.
Between the laundry inlet/outlet hole 70 and the inlet of the tub
body 58 is disposed a gasket 79 for reducing impact generated when
the drum 60 is rotated and serving as a packing member for
preventing leakage of washing water.
[0058] At the outer circumferential surface of the tub body 58 is
formed a weight receiving part 90, in which the balance weight 80
is received by injection molding such that unbalance in weight of
the tub body 58 due to the pulleys 64, the belt 66, the motor 68,
and other parts is eliminated by the balance weight 80.
[0059] The tub body 58 comprises: a front tub 58A having an inlet
formed at the front surface thereof and the rear surface of which
is opened; and a rear tub 58B attached to the rear surface of the
front tub 58A and the front surface of which is opened. Preferably,
the weight receiving part 90 is formed at the front tub 58A and/or
the rear tub 58B.
[0060] In the following description, the weight receiving part 90
is formed at the front tub 58A.
[0061] At the inlet of the front tub 58A is formed a curling part
59A, to which the gasket 79 is connected. The curling part 59A is
bent in such a manner that the curling part 59A is protruded
forward a predetermined height from the inlet of the front tub 58A
and is then extended outward.
[0062] The balance weight 80 is a heavy weight member, such as a
concrete material or a metal material. Preferably, the metal
material has a low melting point. Specifically, the balance weight
80 is injected into the weight receiving part 90 in a fluid state,
and is then hardened in the weight receiving part 90. As a result,
the balance weight 80 is integrally attached to the tub body
58.
[0063] Meanwhile, the weight receiving part 90 is formed at the
outer circumferential surface of the front tub 58A in the shape of
a rib. Also, the weight receiving part 90 is formed along the outer
circumference of the front tub 58A.
[0064] Specifically, the weight receiving part 90 comprises: a
vertical rib 92 protruded outward from the outer circumferential
surface of the front tub 58A along the outer circumference of the
front tub 58A while the vertical rib 92 is perpendicular to the
outer circumferential surface of the front tub 58A; and a
horizontal rib 93 protruded forward or rearward from the tip end of
the vertical rib 92 while the horizontal rib 93 is parallel with
the outer circumferential surface of the front tub 58A.
[0065] The balance weight 80 is injected into the space defined
between the vertical and horizontal ribs 92 and 93 and the outer
circumferential surface of the front tub 58A, and is then hardened
in the space. As a result, the ring-shaped balance weight 80 is
integrally attached along the outer circumferential surface of the
front tub 58A.
[0066] The weight receiving part 90 has collapsed sections 94,
which are opposite to both side surfaces of the cabinet 52.
Specifically, the collapsed sections 94 of the weight receiving
part 90 are collapsed toward the tub body 58 to prevent collision
of the tub body 58 and the cabinet 52.
[0067] The collapsed sections 94 of the weight receiving part 90
are vertically arranged such that the collapsed sections 94 of the
weight receiving part 90 are parallel with the side surfaces of the
cabinet 52.
[0068] The manufacturing process, operation, and effects of the tub
for drum type washing machines with the above-stated construction
according to the first preferred embodiment will be described
hereinafter in detail.
[0069] First, the front tub 58A is molded through injection molding
of synthetic resin such that the weight receiving part 90 is formed
at the outer circumferential surface of the front tub 58A along the
outer circumference of the front tub 58A. Similarly, the rear tub
58B is also molded through injection molding of synthetic
resin.
[0070] The opened front surface of the rear tub 58B is connected to
the opened rear surface of the front tub 58A. As a result, the tub
body 58 is completed.
[0071] A concrete material or a metal material having a low melting
point is injected into the weight receiving part 90 of the
completed tub body 58 in a fluid state, and is then hardened in the
weight receiving part 90. As a result, the balance weight 80 is
integrally attached to the front tub 58A along the outer
circumferential surface of the front tub 58A.
[0072] Specifically, the balance weight 80 is formed in the shape
of a ring, which surrounds the outer circumferential surface of the
front tub 58A.
[0073] Consequently, the balance weight 80 is stably and securely
attached to the tub body without the provision of additional fixing
units. Furthermore, the molding process of the balance weight 80
and the fixing process of the balance weight 80 are simultaneously
performed, and therefore, the assembly of the tub body 58 and the
balance weight 80 is easily accomplished.
[0074] When the drum type washing machine 50 with the tub, to which
the balance weight is integrally attached, mounted therein is
operated, an appropriate amount of washing water is supplied into
the tub body 58, and a rotating force of the motor 68 is
transmitted to the drum 60 via the pulleys 64 and the belt 66, and
therefore, the drum 60 is rotated. During the rotation of the drum
60, washing, rinsing, and spin-drying operations of laundry placed
in the drum 60.
[0075] As the motor 68 and the drum 60 are rotated as described
above, the tub body 58 is vibrated back and forth, right and left,
and up and down. However, the vibration of the tub body 58 is
absorbed by elastic force of the springs 54 and damping force of
the damper 56.
[0076] According to the present invention, the balance weight is
not disposed at the front surface of the tub body 58, which is
distinguished from the conventional art. Consequently, the
provision of sufficient space between the tub body 58 and the
cabinet cover 72 is easily accomplished.
[0077] Since the sufficient space is provided between the tub body
58 and the cabinet cover 72, the collision of the front surface of
the tub body 58 and the cabinet cover 72 due to the vibration of
the tub body 58 is effectively prevented. In the case of the drum
type washing machine with drying function, the drying duct is
easily disposed between the tub body 58 and the cabinet cover
72.
[0078] Although the weight receiving part 90 and the balance weight
80 are disposed along the outer circumferential surface of the
front tub 58A, the collapsed sections 94 of the weight receiving
part 90 and the balance weight 80 are collapsed toward the tub body
58. Consequently, the provision of space between the tub body 58
and the cabinet cover 52 is easily accomplished.
[0079] Specifically, the height of the collapsed sections 94 of the
weight receiving part 90 and the balance weight 80 from the tub
body 58 is lower than that of other sections of the weight
receiving part 90 and the balance weight 80 from the tub body 58.
Consequently, the distance between the opposite side surfaces of
the cabinet 52 and the tub body 58 is not greatly decreased.
[0080] FIG. 7 is a sectional view illustrating a drum type washing
machine with a tub according to a second preferred embodiment of
the present invention mounted therein, and FIG. 8 is a perspective
view illustrating the tub for drum type washing machines according
to the second preferred embodiment of the present invention.
[0081] Components of the second preferred embodiment of the present
invention, which are identical or similar in construction to those
of the first preferred embodiment of the present invention, are
indicated by the same reference numerals as those of the first
preferred embodiment of the present invention, and a detailed
description thereof will not be given.
[0082] As shown in FIGS. 7 and 8, the tub for drum type washing
machines according to the second preferred embodiment of the
present invention is characterized by a tub body 58, which
comprises: a front tub 58A having an inlet formed at the front
surface thereof and the rear surface of which is opened; and a rear
tub 58B attached to the rear surface of the front tub 58A and the
front surface of which is opened, and a cylindrical rib 59 disposed
around the inlet of the front tub 58A while the cylindrical rib 59
is protruded forward a predetermined height from the front tub
58A.
[0083] At the tip end of the cylindrical rib 59 is formed a curling
part 59A, to which a gasket 79 is connected. The curling part 59A
is bent in such a manner that the curling part 59A is extended
outward.
[0084] The tub for drum type washing machines according to the
second preferred embodiment of the present invention is also
characterized by a weight receiving part 96 comprising: a vertical
rib 97 protruded outward from the outer circumferential surface of
the front tub 58A along the outer circumference of the front tub
58A while the vertical rib 92 is perpendicular to the outer
circumferential surface of the front tub 58A; and a horizontal rib
98 formed such that the horizontal rib 98 is protruded from the tip
end of the vertical rib 97 further forward than the front surface
of the front tub 58A while the horizontal rib 98 is parallel with
the outer circumferential surface of the front tub 58A.
[0085] Furthermore, the tub for drum type washing machines
according to the second preferred embodiment of the present
invention is characterized by a balance weight 82 comprising: a
first weight 84 disposed between the vertical and horizontal ribs
97 and 98 and the outer circumferential surface of the front tub
58A; and a second weight 86 disposed between the vertical and
cylindrical ribs 97 and 59 and the front surface of the front tub
58A, the second weight 86 being integrally molded with the first
weight 84.
[0086] Other components of the tub for drum type washing machines
according to the second preferred embodiment except the cylindrical
rib 59, the weight receiving part 96, and the balance weight 82 are
identical in construction to those of the tub for drum type washing
machines according to the first preferred embodiment.
[0087] The manufacturing process of the tub for drum type washing
machined with the above-stated construction according to the second
preferred embodiment will be described below. The balance weight 82
is injected into the weight receiving part 96 in a fluid state
until the balance weight 82 is filled up to between the tip end of
the horizontal rib 98 and the cylindrical rib 59 of the front tub
58A, and is then hardened in the weight receiving part 96. As a
result, the balance weight 82 covers the front surface of the front
tub 58A.
[0088] At this time, the thickness of the second weight 86 disposed
at the front surface of the front tub 58A is smaller than that of
the first weight 84 disposed at the outer circumferential surface
of the front tub 58A. Consequently, the provision of space between
the balance weight 82 and the cabinet cover 72 is easily
accomplished.
[0089] According to the second preferred embodiment, the balance
weight 82 is more stably attached to the tub body 58, and the
weight of the balance weight 82 is more greatly increased.
[0090] FIG. 9 is a sectional view illustrating a drum type washing
machine with a tub according to a third preferred embodiment of the
present invention mounted therein, and FIG. 10 is a perspective
view illustrating the tub for drum type washing machines according
to the third preferred embodiment of the present invention.
[0091] Components of the third preferred embodiment of the present
invention, which are identical or similar in construction to those
of the second preferred embodiment of the present invention, are
indicated by the same reference numerals as those of the second
preferred embodiment of the present invention, and a detailed
description thereof will not be given.
[0092] As shown in FIGS. 9 and 10, the tub for drum type washing
machines according to the third preferred embodiment of the present
invention is characterized by motion preventing protrusions 100
protruded from the front surface of the front tub 58A for
preventing motion of the balance weight 82 received in the weight
receiving part 96. Other components of the tub for drum type
washing machines according to the third preferred embodiment are
identical in construction to those of the tub for drum type washing
machines according to the second preferred embodiment.
[0093] Specifically, the motion preventing protrusions 100 are
protruded forward from the front surface of the front tub 58A, on
which the balance weight 82 is disposed. The motion preventing
protrusions 100 are arranged at the front surface of the front tub
58A in the circumferential direction while being spaced apart from
one another.
[0094] At each of the tip ends of the motion preventing protrusions
100 is formed a separation preventing extension 102 for preventing
the balance weight 82 from being separated from the front tub 58A.
Specifically, the balance weight 82 is caught by the separation
preventing extensions 102 such that the balance weight is not
separated from the front tub 58A.
[0095] As a result, the up-and-down and right-and-left motion and
the circumferential rotation of the balance weight 82 is
effectively prevented by the motion preventing protrusions 100, and
the back-and-forth motion of balance weight 82 is effectively
prevented by the separation preventing extensions 102.
[0096] Consequently, the balance weight 82 is more securely and
stably attached to the tub body 58 by means of the motion
preventing protrusions 100 having the separation preventing
extensions 102.
[0097] 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.
[0098] For example, the weight receiving part may be formed at the
upper part or the lower part of the tub body based on design
conditions of the tub body. Alternatively, the weight receiving
part may be partially formed at the side part of the tub body.
Furthermore, the weight receiving part may be formed in the shape
of a box having an injection port defined by the vertical rib and
the horizontal rib.
[0099] As apparent from the above description, the tub for washing
machines according to the present invention has the following
effects.
[0100] The balance weight is injected into the weight receiving
part formed at one side of the tub body, and is then hardened in
the weight receiving part. As a result, the balance weight is
integrally attached to the tub body, which eliminates the necessity
of providing additional fixing units for fixing the balance weight
to the tub body, and therefore, the balance weight and the tub are
formed in a simple structure.
[0101] Since the balance weight is integrally attached to the tub
body, and therefore, the necessity of providing the fixing units
for fixing the balance weight to the tub body is eliminated, the
number of parts is decreased, the manufacturing process of the
parts is simplified, and the manufacturing costs of the parts are
decreased. Especially, accidental separation of the balance weight
from the tub body due to damage to the fixing units is effectively
prevented.
[0102] Moreover, the weight receiving part is formed at the outer
circumferential surface of the tub body along the outer
circumference of the tub body. As a result, the balance weight is
disposed such that the balance weight surrounds the outer
circumferential surface of the tub body. Consequently, the rigidity
of the tub body due to the balance weight is increased, and
therefore, deformation of the tub body or damage to the tub body is
effectively prevented.
[0103] In addition, the balance weight is integrally molded between
the weight receiving part and the tub body, and the motion
preventing protrusions, which are provided at the tip ends thereof
with the separation preventing extensions, respectively, are
protruded forward from the front surface of the tub body.
Consequently, the motion of the balance weight and separation of
the balance weight from the tub body are effectively prevented.
[0104] Furthermore, the provision of space between the tub body and
the cabinet cover is easily accomplished, and therefore, the
collision of the tub body and the cabinet cover is effectively
prevented. Consequently, vibration-preventing design of the drum
type washing machine is more easily accomplished. Especially, the
present invention is very useful when a drum type washing machine
with drying function having a drying duct disposed in front of the
tub body is designed. Also, increase in size of the drum type
washing machine is prevented.
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