AU662067B2

AU662067B2 - Inner tub of a washing machine

Info

Publication number: AU662067B2
Application number: AU44357/93A
Authority: AU
Inventors: Shin Bong Yang
Original assignee: Gold Star Co Ltd
Current assignee: Intellectual Discovery Co Ltd
Priority date: 1993-05-26
Filing date: 1993-07-30
Publication date: 1995-08-17
Anticipated expiration: 2013-07-30
Also published as: KR940026853U; JP3510907B2; JP2003245493A; CN1048773C; CN1095777A; AU4435793A; JPH06335594A; KR960004298Y1

Description

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Regulation 32

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

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Name of Applicant: GOLDSTAR. CO., LTD.

Actual Inventor(s): YANG, Shin Bong Address for service in Australia: CARTER SMITH BEADLE, Qantas House, 2 Railway Parade, Camberwell, Victoria, 3124, Australia.

Invention Title: "Inner Tub of a Washing Machine" The following statement is a full description of this invention, including the best method of performing it known to us: BACKGROUND OF THE INVENTION This invention relates to an inner tub of a washing machine, and more particularly to the inner tub of the washing machine capable of having uniform rubbing effect between the upper part and the lower part thereof.

As 'shown in FIG. 1 and FIG. 2, a conventional inner tub of a washing machine(Japanese patent laid open No.4-19789) is arranged inside of a washing machine case as a combined washing and drying tub(hereinafter called "inner tub") 1 made of stainless steel.

.110 The inner tub 1 includes a ring la for mounting a fulid balance thereon in the upper part, a cylindrical body Ib forming body part and a bottom plate Ic forming the lower part. On the internal surface of the body Ib of the inner tub 1, embossings 2 of same size project facing inside throughout the 1 height of the inner tub 1. A pulsator 3 is rotatingly provided on the bottom plate Ic.

Washing is effectuated by the rubbing effect between laundries, laundries and the pulsator 3, and laundries and embossings 2 when the pulsator 3 is rotated reversingly by a motor(not shown) generating turbulent pulsation of washing water and laundries.

In such a conventional washing machine, however, there has 1A

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-2been a problem of un-uniform washing due to the un-uniform rubbing effect between the upper part and the lower part of the inner tub 1 during washing. This is because of the existence of the direct rubbing of the pulsator 3 with laundries, rubbing between laundries caused by the turbulent pulsation of washing water generated by the pulsator 3, and rubbing between laundries and embossings 2 projected facing inside on the internal surface of the inner tub 1, in the lower part of the inner tub 1 compared to the non-existence of direct rubbing by the pulsator 3 and the weaker rubbing between laundries, and the embossings 2 and laundries, in the upper part of the inner tub 1. In short, in the conventional washing machine, the uniform washing effect and the uniform wearing rate of laundries can hardly be expected due to the un-uniform rubbing effect between the upper part and the lower part of the inner tub 1.

SUMMARY OF THE INVENTION An object of the present invention is to provide an inner tub of a washing 15 machine capable of having uniform rubbing effect.

This object is achieved by an inner tub of a washing machine comprising: a body having a plurality of embossings on the cylindrical internal surface of said CIE body, the plurality of embossings formed in a manner that rubbing effects between laundries and the plurality of embossings are gradually decreased from the top to the S 20 bottom of the inner tub; and a bottom plate attached under said body closing the bottom of the inner tub, said bottom plate including a pulsator.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a sectional view of a conventional washing machine.

Figure 2 is a sectional view of an inner tub of the conventional washing machine.

Figure 3 is a sectional view of a washing machine according to this invention.

Figure 4 is a sectional view of an inner tub of the washing machine of this invention.

S RGMI:U1SUSPC 7 Marh 1995 L0 Im rr ;i i-i i i-i -3- Figure 5(A) is a plan view in half showing the inner tub of this invention.

Figure 5(B) shows a longitudinal section of a bottom plate of this invention.

Figure 6 shows an inner tub filter in assembled condition of this invention.

Figure 7 is a sectional view of curling part of an inner tub body of this invention.

Figure 8 is a sectional view of a flattening jointing part of the inner tub body of this invention.

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mJGNBJ13521.SF 7 Marh 1995 AUAK 105Ln~~~s n~ 017ffr1:f;3'~C~~ FIG. 9 is a sectional view of another flatening jointing part of a bottom plate with the inner tub body of this invention.

FIG. 10 is a sectional view of a embossing for reinforcing of the inner tub body of this invention.

SFIG. 11 is a sectional view of a embossing of the inner tub body of this invention.

FIG. 12 is a sectional view of a guiding projection for jointing of a filter on the inner tub body of this invention, FIG. 13 is a sectional view of a water extraction hole on O the inner tub body of this invention, a °DETAILED DESCRIPTION OF THE INVENTION 6 Shown in FIG. 3 is a washing machine of this invention including an outcase 8 surrounding the whole washing machine, on the upper part of the outcase 8 positioned a top cover 6 with a 15 operating panel 7 for operating the washing machine and inside of

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the outcase 8 hung an out tub 11 supported by snuff bars 9 and damper springs Inside of the out tub 11, an inner tub 5, a combined washing and drying tub, is provided connected with a clutch 12 which 2" transmits power and reduces speed. In the lower part of the inside of the inner tub 5, a pulsator 17 is provided reversingly rotating by a driving motor via a motor pulley 14, a belt 16 connecting the motor pulley 14 and a clutch pulley 15 and the i i _II_7_P- l I I i clutch pulley 15 connected with the clutch 12. In the upper part of the inner tub 5, a fluid balance 4 is provided adjusting the lean of the inner tub 5 caused by laundries during washing and drying. And a filter 18 is provided collecting bits of S thread by the circulation of water. Below the out tub 11, a drain valve 19 and a drain hose 20 are arranged.

As shown in FIG. 3 and FIG. 4, the stainless steel inner tub includes a cylindrical body 5a having a internal surface, embossings 5c, 5e and water extraction holes 5f being formed thereon, and a bottom plate 5b having a hub 27 connected to the bottom plate 5b from below, the clutch 12 being fixed and S supported thereon.

S As shown in FIG. 4 and FIG. 11, the internal surface of the body 5a of the inner tub 5 includes the embossings 5c formed S gradually smaller from the top to the bottom facing inside to el r S make the rubbing effect less strong gradually.

Also, though not, shown, as another embodiment of this invention, the internal surface of the body 5a of the inner tub may includes embossings formed gradually sparser in distribution of embossings of same size from the top to the bottom facing inside to make the rubbing effect less strong gradually.

Further, the internal surface of the body 5a of the inner tub includes a plurality of reinforcing oblong the embossings formed oblong in a top to bottom direction as shown in FIG. and a plurality of water extraction holes 5f formed by burring

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between the embossings 5c, 5e as shown in FIG. 13.

On the internal surface of the body 5a of the inner tub 5, a plurality of square and circular filter 18 jointing holes 5h and long guiding tips 5g are arranged in a top and bottom direction to catch and collect tips of thread during washing as shown in FIG. 6 and FIG. 12.

At the top of the body 5a of the inner tub 5, a fluid balance 4 is fixed by screws 5m thereon and the upper edge of the body 5a is finished by forming a curling part 5i, to reinforce the upper part and to make ease of jointing the fluid balance 4 thereon as shown in FIG. 7.

The body 5a itself is formed cylindrically, as shown in FIG, i I S 8, by rolling a sheet of stainless steel and jointing the two ends by flatening joint 5k. I On the other hand, as shown in FIG. 5(A) and the bottom plate 5b of the inner tub 5 has a hole 5t formed at the center of the bottom plate 5b, the circumference 5u of the hole 5t is formed with steps for reinforcement. On the circumference of the bottom plate 5b, a plurality of circumferential projections 5d is formed to prevent the leaning

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Sof the laundry and a plurality of screw holes 5s is formed to join the lower ends of the filters 18.

Between the central part and the circumferential part of the bottom plate 5b, a plurality of cavities 5r of fixed size and a5 fixed depth are formed for the reinforcement of the bottom plate i and inside of the cavities 5r, a plurality of hub jointing holes 5p is formed to connect the hubs 21 to the bottom plate and a plurality of drain holes 5g is formed to drain washing water.

As shown in FIG. 9, the body 5a and the bottom plate 5b of the inner tub 5 are jointed by a flatening joint 51 throughout all the circumference of the lower edge of the body 5a and the upper edge of the bottom plate In the washing machines of this invention, the washing is l0 motivated in washing mode by the reversingly rotating pulsator 17 arranged in the bottom of the inner tub 5. The rubbing effect of the lower part of the inner tub where the pulsator 17 *0 Spositioned is stronger than that of the upper part due to the stronger turbulence and the rubbing effect of pulsator vanes in 1~ the lower part. In this invention, the smaller embossings are formed in the lower part of the body 5a where the rubbing effect is stronger while the bigger embossings 5c are formed in the upper part of the body 5a of the inner tub 5 where the rubbing effect is weaker, whereby forming a uniform rubbing effect throughout the height of the inner tub SFurther, the oblong embossings 5e maintains the strength of the inner tub 5 during high speed drying. And the circumferential projections 5d formed in the bottom plate 5b cf the inner tub 5 prevent the leaning of the laundry on !I 5 circumferential surface of the bottom plate 5b during washing, .7 whereby increasing the washing effect. Meantime this invention of two piece type inner tub has the advantage of cost down compared with the three piece type conventional inner tub.

Although the invention has been described in conjunction with specific embodiments, it is evident that many alternatives and varietions will be apparent to those skilled in the art in light of the foregoing description. Accordingly, the invention is intended to embrace all of the alternatives and variations that fall within the spirit and scope of the appended iO claims.

The claims form part of the disclosure of this specification.

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Claims

1. An inner tub of a washing machine, comprising a body having a plurality of embossings on the cylindrical internal surface of said body, the plurality of embossings formed in a manner that rubbing effects between laundries and the plurality of embossings are gradually decreased from the top to the bottom of the inner tub; and a bottom plate attached under said body closing the bottom of the inner tub, said bottom plate including a pulsator.

2. An inner tub in accordance with claim 1, wherein the plurality of embossings are formed gradually smaller in size from o0 S the top to the bottom of the inner tub. oo.

3. An inner tub in accordance with claim 1, wherein the plurality of embossings are formed gradually sparser in the distribution of the embossings of same size from the top to the bottom of the inner tub.

4. An inner tub in accordance with claim 1, wherein said body includes an integrally processed part formed on the top thereof in order to mount a fluid balance thereon.

An inner tub in accordance with claim 4, wherein the 0O processed part is processed by curling.

6. An inner tub in accordance with claim 1, wherein the bottom plate is attached to the body by seaming.

7. An inner tub in accordance with claim 1, wherein the 9 i internal surface of said body further includes a plurality of oblong embossings for reinforcement.

8. An inner tub cf a washing machine substantially as hereinbefore described with reference to Figures 3 to 13 of the accompanying drawings.

9. A washing machine incorporating an inner tub in accordance with any one of claims 1 to 8. DATED: 7 March 1995 CARTER SMITH BEADLE Patent Attorneys for the Applicant: GOLDSTAR CO., LTD 14 I 1. t t. 4 t 4 t t j i~ o 7 Mmch 1995 .9 ABSTRACT An inner tub of a washing machine is provided consisting of a body having a plurality of embossings (5c) cn the cylindrical internal surface of the body. A bottom plate (5b) is attached under the body (5a) closing the bottom of the inner tub the bottom plate including a pulsator The plurality of embossings (5c) are formed in such a manner that rubbing effects between laundry and the plurality of embossings (5c) are gradually decreased from the top to the bottom of the inner tub where the rubbing effect due to the pulsator (17) is stronger. The washing effect is thus increased, and a uniform rubbing effect is obtained throughout the height of the inner tub uo a o 0 0 1440 0*0* I I or c JRG:DMW\spc\#13521.spg 29 July 1993 j