JPH11188194A - Rotary basket for spin-drying for two-basket type washing machine and manufacture therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dissolve the failures that a rotary basket for spin-drying made of resin is easily scratched and easily stained when scratched and the rotary basket for the spin-drying made of an enameled steel plate is easily cracked by an impact and gets rusty starting from a cracked part while the rotary basket for the spin-drying of a two-basket type washing machine is made of the resin or made of the enameled steel plate conventionally. SOLUTION: In the two-basket type washing machine, this rotary basket for the spin-drying is provided with a double cylinder structure provided with an inner basket 24 made of stainless steel and a body part 22 and a bottom part 21 made of resin on the outer side. Burring work is executed to the water discharge hole 24a of the inner basket 24 and the water discharge hole 22a larger than that is formed at the body part 22. The body part 22 protects burrs at the peripheral edge of the water discharge hole 24a or the like. The outer peripheral surface 24c of the inner tank 24 and the inner peripheral surface 22c of the body part 22 are turned to the tapered surfaces of the same gradient and the inner tank 24 is inserted immediately after the resin molding of the body part 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a two-tub washing machine having a dewatering tub. In particular, it relates to a rotary tub for dehydration.

[0002]

2. Description of the Related Art As is well known, a two-tub washing machine has a washing tub and a dewatering tub disposed in a housing. The dewatering tub is provided with a rotary tub that rotates at a high speed during dehydration. Conventionally, this rotary tank was made of resin or enameled steel sheet.

[0003]

However, in the case of a resin-made rotary tank, the inner surface of the rotary tank is easily damaged.
There was a problem that dirt easily adhered. On the other hand, the rotary tank made of enameled steel sheet does not easily adhere to dirt and is easy to keep clean. However, when cracks or the like occur in the enamel, there is a problem that rust is generated from that part. In particular, the rotating tub may shake greatly due to the bias of the laundry, etc.
The enamel was prone to cracking upon impact.

Accordingly, an object of the present invention is to provide a novel dewatering rotary tub and a method for producing the same, which solve the problems of the conventional dewatering rotary tub of a two-tub washing machine.

[0005]

In order to achieve the above object, a spin-drying tub of a two-tub washing machine according to the first aspect of the present invention is a dehydrating tub of a two-tub washing machine having a washing tub and a spin-drying tub. A dewatering rotary tub provided with a plurality of drain holes in the dewatering rotary tub, characterized by having an inner surface made of stainless steel.

According to a second aspect of the present invention, there is provided a rotary tub for dehydrating a two-tub washing machine, wherein the rotary tub for dehydrating is a cylindrical body. And a bottom part closing the lower part of the body part, and the body part is provided with an inner tank having a cylindrical shape made of stainless steel forming the inner surface and having a large number of drain holes formed therein. Features. Claim 1
According to the configuration of the second aspect, the spinning tub for dewatering has an inner surface made of stainless steel, so that the friction of the inner surface is small, and it is easy to put laundry in and out of the spinning tub for dehydration.
The inner surface of the stainless steel is hard, hard to be scratched, and hard to rust. Therefore, it is possible to provide a clean dewatering rotary tub to which dirt hardly adheres. In particular, if a stainless steel inner tank is provided on the inner peripheral surface of the body portion and a drainage hole is formed therein as in the configuration of the second aspect, adhesion of dirt to the drainage hole portion is small, and rust A clean structure that does not occur can be provided.

According to a third aspect of the present invention, there is provided a dewatering rotary tub for a two-tub washing machine according to the second aspect, wherein each drain hole has a burring from an inner surface side. It is characterized by being processed. In this configuration, the laundry or the like does not get caught on the periphery of the drain hole due to the burring process. Also, there is no danger that small buttons, pins, etc. will jump out of the drain holes.

According to a fourth aspect of the present invention, there is provided a rotating tub for dehydrating a two-tub washing machine according to the third aspect of the present invention, wherein a protective tub is provided on an outer peripheral surface of the inner tub. The protection tank is characterized in that a drain hole larger than the drain hole of the inner tank is formed at a position corresponding to the drain hole of the inner tank. According to a fifth aspect of the present invention, there is provided the spin-drying tub of the two-tub washing machine according to the fourth aspect of the present invention, wherein the spin tub of the spin-drying machine according to the fourth aspect projects outward by burring the outer peripheral surface of the inner tub. It is characterized in that the thickness of the portion forming the drainage hole of the protection tank is set so as to be deeper than the amount.

According to the fourth and fifth aspects, since the protection tank is provided on the outer peripheral surface of the inner tank, the strength of the rotary tub for dehydration can be increased by the protection tank, and the thickness of the inner tank made of stainless steel can be increased. Can be reduced. In addition, since the drainage hole of the protection tank is larger than the drainage hole of the inner tank, the alignment of the drainage holes between the protection tank and the inner tank can be easily completed. Can be easily assembled.

[0010] Further, when laundry enters into a gap defined around the spin tub for dehydration, even if a user's hand trying to take out the laundry touches the outer peripheral surface of the spin tub for dehydration, the outer peripheral surface is not removed. It is protected by a protection tank, and hands do not directly touch the stainless steel inner tank. Therefore, a safe spin-drying tub can be obtained. In particular, with the configuration as described in claim 5, the portion forming the drainage hole of the protection tank can surely protect the burring-processed portion of the inner tank.

According to a sixth aspect of the present invention, there is provided a method for manufacturing a spin-drying tub for a two-tub washing machine, comprising the steps of: A method, a cylindrical inner tank made of stainless steel,
A number of drain holes are formed in the inner tank, each drain hole is formed by burring from the inner surface side, and is a resin outer tank having an inner diameter larger than the outer diameter of the inner tank. Forming an outer tank made of resin in which a drain hole larger than the drain hole of the inner tank is formed at a position corresponding to the drain hole of the inner tank, and immediately after forming the outer tank, the inner tank is placed in the outer tank. By inserting, the inner tank and the outer tank are integrated.

According to a seventh aspect of the present invention, there is provided a method for manufacturing a dewatering rotary tub of a two-tub washing machine, comprising the steps of: The inner surface is
The inner tank is formed with a taper surface having substantially the same gradient, thereby facilitating insertion of the inner tank into the outer tank. According to the manufacturing method of the sixth and seventh aspects, the inner tank made of stainless steel and the outer tank made of resin can be separately configured, and both can be favorably combined. In particular, the inner tank is easily inserted into the outer tank by forming the inner tank with a tapered surface having the same gradient as described in the seventh aspect.

The method for manufacturing a spin tub for spin-drying of a two-tub washing machine according to the present invention is a method of manufacturing a spin tub for spin-drying provided in a spin tub of a double-tub washing machine having a spin tub and a spin tub. A method, a cylindrical inner tank made of stainless steel,
Many drain holes are formed in the inner tank, and each drain hole is formed by burring from the inner surface side, and the inner tank is used as an insert, and a resin outer tank is formed on the outer peripheral surface of the inner tank. Is insert-molded.

According to this manufacturing method, the outer tank can be easily integrated with the outer peripheral surface of the inner tank by insert molding using the inner tank as an insert.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A two-tub washing machine according to an embodiment of the present invention will be described below with reference to the accompanying drawings. FIG.
1 is a front sectional view of a schematic configuration of a two-tub washing machine according to one embodiment of the present invention.

The two-tub washing machine 1 includes a washing tub 3 for washing and rinsing and a dewatering tub 4 for dehydrating in a housing 2. The housing 2 is formed in a substantially rectangular box shape in a plan view, and houses the washing tub 3 and the dewatering tub 4 adjacent to each other. A water supply mechanism 5 having a pipe, a switching valve, and the like connected to an external water supply facility (not shown) such as tap water is provided at an upper portion in the housing 2, and water is supplied to either the washing tub 3 or the dehydration tub 4. can do. In addition, a drainage mechanism 6 including a pipe, a valve, and the like connected to the bottom of both tanks is provided, and drainage can be performed from both tanks.

The washing tub 3 is formed in a container shape opened upward, and has a stirring blade 31 at the bottom thereof. Stirring blade 3
1 is rotatably driven by a driving device 32 including a motor, and can stir water and laundry in the washing tub 3 to wash and rinse. FIG. 2 is a side sectional view of the dewatering tub of the two-tub washing machine of FIG. The dewatering tub 4 has a smaller planar shape than the washing tub 3. The dewatering tub 4 includes a container-shaped fixed tub 41 fixed to the housing 2 and opened upward, and a rotating tub 40 rotatably supported in the fixed tub 41. The rotary tank 40 is formed in a cylindrical shape with a bottom, and a shaft 46 extending in the vertical direction is fixed to the bottom 21 via a flange-like member 45. The shaft 46 passes through a flexible sealing member 47 at the bottom of the fixed tank 41 and is connected to a rotating shaft of a motor 48. The motor 48 is supported on the bottom of the housing 2 by a damper 49 including an elastic member such as a spring. The rotating tub 40 is driven by the motor 48 to rotate in one direction at a high speed while the vibration thereof is suppressed by the damper 49, so that the laundry inside can be dehydrated.

In this embodiment, the rotary tank 40 includes an inner tank 24 made of stainless steel and a protective tank made of resin that covers the inner tank 24. Since the inner tub 24 is made of stainless steel, friction can be reduced and laundry can be easily taken in and out. In addition, since stainless steel is hard, it is difficult for the inner surface to be scratched when the laundry is taken in and out, and the stainless steel is hard to rust, so that it can be kept clean.

The details will be described below. FIG. 3 is an enlarged side sectional view of the dewatering tub of FIG. Please refer to FIG. 2 and FIG.
The rotating tank 40 includes a cylindrical inner tank 24 made of stainless steel,
A protective tank made of resin. The protection tank has a bottom portion 21 at the lowermost portion, a cylindrical body portion 22 extending upward from the bottom portion 21, and a ring portion 23 at the uppermost portion. The body 22 constitutes an outer tank having a double cylindrical structure with the inner tank 24.

The inner tank 24 is formed of a stainless steel thin plate in a substantially cylindrical shape. The inner tub 24 has a smooth inner peripheral surface 24b having a tapered shape with a larger upper portion, so that friction with laundry to be taken in and out is reduced. Inner peripheral surface 24
“b” forms a main part of the inner surface portion of the rotary tank 40.
Further, the outer peripheral surface 24 c of the inner tank 24 is formed in a tapered shape in which the upper portion is enlarged, and the taper is formed in the inner peripheral surface 2
It is set to the same gradient as the taper of 2c. Further, the outer peripheral surface 24c of the inner tank 24 is fitted to the inner peripheral surface 22c of the body 22 in a substantially close contact state.

The inner tub 24 has a number of drain holes 24a through which water flows out during dehydration. Drain hole 24a
Is subjected to burring, and the periphery of each drainage hole 24a projects outward. When burring is performed, the periphery of the drainage hole 24a is smoothly connected to the inner peripheral surface 24b of the inner tank 24 and extends in the depth direction of the drainage hole 24a. Therefore, it is possible to make it difficult to pass through an elongated foreign matter such as a pin or a match stick. Further, even if the clothing is in contact with the inner peripheral surface 24b, the clothing is not damaged.

The body 22 also has a number of drain holes 22a. The drain hole 22a is formed to be larger than the drain hole 24a of the inner tank 24.
Surrounds a. Since the burring process is applied to the drain hole 24a, there are burrs on the outside. Therefore,
The body 22 functions as a protection member that protects a user's hand, laundry, and the like against burrs and the like in the inner tub 24. In particular, the thickness of the portion of the body 22 where the drainage hole 22a is formed is set to be deeper than the amount of the outer peripheral surface of the inner tank 24 that protrudes outward by burring. Thereby, the portion forming the drain hole 22a can surely protect the burred portion of the inner tank 24.

That is, when the laundry enters the gap defined between the rotating tub 40 and the fixed tub 41, the user's hand puts the laundry around the rotating tub 40 in an attempt to remove the laundry. May be entered. The projections such as burrs on the outer peripheral surface of the inner tub 24 are located inside the drainage holes 22a and are protected by the peripheral edges 22b of the drainage holes 22a. Inadvertent contact with an object or the like can be prevented. Therefore, a safe spin-drying tub can be obtained. In addition, as the protective member, a circular member that continuously surrounds the entire circumference of the drainage hole 24a is illustrated, but is not limited thereto. In short, the protection member may be provided outside the rotary tank 40 and in the vicinity of the drainage hole 24a so as to protect the protrusion on the periphery of the drainage hole 24a.

The body 22 is formed in a substantially cylindrical shape.
It has a tapered inner peripheral surface 22c whose upper inner diameter is large. The slope of the taper of the inner peripheral surface 22c is set to, for example, 0.5 degree as a draft for resin molding. On the outer peripheral surface of the body 22, a reinforcing rib 22d extends in the circumferential direction and does not extend in the height direction. Thus, foaming due to the reinforcing rib 22d during rotation can be prevented.

The bottom 21 is formed in a concavely curved dish shape. The bottom 21 is screwed to a flange-like member 45 fixed to the upper end of the shaft 46. A groove 21a is formed at a boundary between the bottom 21 and the body 22. The groove 21a is formed inside the rotary tank 40, is formed in an annular shape, and is opened upward. The lower end of the inner tank 24 is fitted into the groove 21a. A plurality of communication holes 21b are formed at the bottom of the groove 21a.
The outer peripheral surface 24c of the inner tank 24 is formed through the communication hole 21b.
Even if a gap is formed between the body part 22 and the inner peripheral surface 22c, the water in the gap can be drained downward, so that the accumulation of dirt in the gap can be prevented.
The inner peripheral side wall portion of the groove 21a supports a step portion 24e formed at a lower portion of the inner tank 24. A projection 21c is formed at the bottom of the groove 21a to engage with a concave portion 24f formed at the lower end of the inner tank 24, and functions as a detent in the circumferential direction of the inner tank 24. Therefore, even if a gap may occur between the stainless steel inner tank 24 and the resin body 22 due to the difference in thermal expansion between them, both can be reliably rotated together. , Functioning as a spin-drying tub without any problems.

The ring portion 23 is formed in a ring shape from a resin material, and is fitted to the upper portions of the inner tank 24 and the body portion 22 with each other.
The ring portion 23 is joined to the upper end portion of the body portion 22 by heat fusion in a fitted state. Next, a method of manufacturing the rotary tank 40 will be described. First, the inner tank 24 is formed. That is,
A large number of water drain holes 24a are formed, and a cylindrical inner tank 24 made of stainless steel and subjected to burring from the inner surface side is formed in each of the water drain holes 24a. For example, a large number of drain holes 24a are formed in a stainless steel plate, and the drain holes 24a are formed.
A is subjected to burring to form a perforated stainless steel plate into a cylindrical shape. The method of forming the inner tank 24 is not limited to the above-described method. For example, a stainless plate is formed in a cylindrical shape, and a large number of drain holes 24a are formed in the formed cylindrical member.
And a burring process may be performed on the drain hole 24a, and a known processing method can be used.

Next, the body 22 and the bottom 21 are integrally molded with resin. The inner diameter of the body portion 22 is formed by resin molding larger than the outer diameter of the inner tank 24 by a predetermined amount. For example, the predetermined amount is set to 1 to 2 mm with respect to the inner diameter of the body 22 being approximately 200 mm, and the predetermined amount is determined by the natural shrinkage of the resin due to the temporal change after molding and the inner peripheral surface 22 c of the body 22. The gap between the inner tank 24 and the outer peripheral surface 24c is set so as to be eliminated.

Immediately after the resin molding, the molded product is immediately taken out of the mold, and the inner tank 24 is inserted into the inside of the body 22 from the large-diameter end. At this time, the inside diameter of the body 22 is large before contraction, and the inner peripheral surface 22c of the body 22
Is tapered, and the water draining hole 22a of the body 22 is larger than the water draining hole 24a of the inner tank 24. Even if the peripheral edge of the drain hole 24a protrudes, the inner tub 24 can be smoothly inserted into the trunk 22 without the peripheral edge hitting the trunk 22.

Thereafter, the ring 23 is fixed to the upper end of the body 22 by heat fusion. As described above, according to the manufacturing method of the present embodiment, the inner portion 24 made of stainless steel and the body portion 22 and the bottom portion 21 serving as the outer portion made of resin are separately formed, and both are favorably combined. Can be. That is, the inner tub 24 can be easily inserted into the body 22 having a large inner diameter immediately after the resin molding, and the gap between the body 22 and the inner tub 24 is formed by utilizing the natural shrinkage of the resin with time. Naturally and reliably reduced.

The inner peripheral surface 22c of the body 22 and the inner tank 24
Is formed with a tapered surface having the same gradient as the outer peripheral surface 24c, so that the inner tank 24 can be easily inserted into the body portion 22. Also,
According to the spin-drying tub of the two-tub washing machine of the present embodiment,
The following effects are obtained. That is, by making the inner peripheral surface 24b, which is the inner surface portion of the rotary tub 40, made of stainless steel, the friction of the dewatering rotary tub of the two-tub type washing machine, which is usually narrow and tends to be difficult to take in and out the laundry, is reduced. As a result, the laundry can be easily taken in and out. In addition, the stainless steel inner surface is harder and harder to damage than resin material,
Moreover, since the rust hardly rusts as compared with the enameled steel sheet, the rotating tank 40 can be kept clean.

In particular, if an inner tank 24 made of stainless steel is provided on the inner peripheral surface of the body 22 and a drain hole 24a is formed therein,
A configuration with high cleanliness with little adhesion of dirt to the drain hole 24a and no rust can be obtained. Further, the burring at the periphery of the drainage hole 24a is prevented from protruding inward of the rotary tank 40 by burring.

If the inner surface is made of stainless steel, projections such as burrs may be formed on the periphery of the drain hole 24a, and the following situation is assumed. That is, in the two-tub washing machine, the laundry enters the fixed tub 41 outside the rotary tub 40 supported by the flexible damper 49, and the user puts his / her hand on the rotary tub to take out the laundry. It may be inserted between 40 and the fixed tank 41.
In such a case, a protection tub is provided in the present embodiment so that the user's hand or laundry does not come into contact with the projections such as burrs. Thereby, when taking out the laundry that has jumped out of the rotating tub 40, as described above, it is possible to prevent the user's hand, laundry, and the like from being damaged by burrs, etc., and to provide a highly safe dehydrating rotating tub. it can.

Further, since the rotary tank 40 has a sufficient strength by having a double cylindrical structure of the stainless steel inner tank 24 and the body 22, the thickness of the inner tank 24 can be reduced. As a result, the inner tank 24 can be formed of a stainless steel thin plate, so that it can be manufactured easily and at low cost. In addition, the protection member can be easily manufactured integrally with the body 22. Also,
In such a double-cylinder structure, when a gap is formed between the cylinders, it is assumed that water enters the gap and dirt accumulates, and if the gap is small, assembly becomes difficult. On the other hand, in the present embodiment, the inner tub 24 and the body 22 are easily inserted by opposing each other with a tapered surface. In addition, since the tapered surfaces having the same gradient can eliminate the gap between the tapered surfaces, it is possible to prevent water from entering the gap, thereby preventing accumulation of dirt.

In particular, since the outer peripheral surface 24c of the inner tank 24 and the inner peripheral surface 22c of the body 22 are brought into close contact with each other, a gap between the two can be reliably eliminated, so that it is ensured that dirt accumulates in the gap. Can be prevented. Further, since water can be prevented from entering the above-mentioned gap from the draining hole 24a subjected to the burring process, it is possible to reliably prevent dirt from accumulating in the gap. This is because the peripheral portion of the drainage hole 24a that protrudes outward by burring can guide water so as to keep water passing through the drainage hole 24a away from the gap, so that water hardly enters the gap. In addition, a drain hole 24a projecting outward by burring.
Since the peripheral portion can make it difficult for foreign matters such as small buttons, pins, and match sticks to pass through the drain hole 24a, the diameter of the drain hole 24a can be increased. The water jumps out, making it difficult for water to enter the gap. Therefore, it is possible to reliably prevent dirt from accumulating in the gap.

The drain hole 22a of the body 22 is
By making it larger than the drain hole 24a of 4, the positioning of the body 22 and the inner tank 24 at the time of assembling can be easily completed, so that the rotary tank 40 having a double cylindrical structure can be easily assembled. . The drain hole 2 of the body 22
By making 2a larger than the drainage hole 24a of the inner tank 24, even if a gap is formed between the body 22 and the inner tank 24, a distance is provided between the gap and the drainage hole 24a. As a result, it is possible to make it difficult for water to enter the gap through the drainage hole 24a, so that it is possible to reliably prevent dirt from accumulating in the gap.

Only the main part of the inner surface of the rotary tank 40 is made of stainless steel, and the other part is made of resin. This makes it possible to form an inner surface portion which is easy to process with a resin which is less workable than the resin and which can be easily processed with a resin having a complicated shape such as the bottom 21 and the like, so that the manufacturing cost can be reduced. Further, since the diameter of the drainage hole 24a that can prevent the passage of foreign matter can be increased by the burring process, it is possible to prevent a button or the like of laundry from being caught in the drainage hole 24a while obtaining high dehydration efficiency.

Further, in the above-described embodiment, the body 22 is formed of a resin material as in the prior art. However, in the rotating tub 40 for dehydration, the detergent or the like hardly adheres to the outer peripheral surface of the body 22. So no problem. In the present embodiment, the inner tank 2
Although the body 4 and the body 22 are separate bodies, they may be formed integrally. For example, it is conceivable to insert-mold the body 22 made of resin using the inner tank 24 made of stainless steel as an insert. According to this manufacturing method, the inner tank 24
Can be omitted, and the body 22 and the inner tub 2 can be inserted.
4 can be reliably eliminated, so that the body 22 can be easily integrated with the outer peripheral surface 24c of the inner tank 24. In this manufacturing method, it is desirable to prevent the inner surface of the inner tank 24 from being damaged when the inner tank 24 is attached to and detached from a mold, a jig, or the like when the body 22 is molded.

In the above-described embodiment, the resin body 22 as a protection member protects the outer peripheral surface 24c of the stainless steel inner tank 24, but the invention is not limited to this.
The protection member may be provided at a portion where a projection such as a burr of the inner tank 24 may occur. For example, as shown in the side view of FIG. 4, an annular peripheral portion 22b as a protective member surrounding the drainage hole 24a may be a lattice-shaped body portion 22 integrally formed by being connected to each other by a bar 22m. . It is also conceivable to form only the annular peripheral portion 22b integrally with the inner tank 24 without the crosspiece 22m. The protective member only needs to be at least on the periphery of the drainage hole 24a, and its material is not limited to resin.

In the above embodiment, only the inner tank 24 is made of stainless steel. However, the present invention is not limited to this.
For example, the body 22, the bottom 21, and the ring 23 may also be made of stainless steel. In short, it is sufficient that at least the inner surface portion of the rotary tank 40 is made of stainless steel. In addition, various design changes can be made without changing the gist of the present invention.

[0040]

According to the first aspect of the present invention, the following effects can be obtained. That is, since the inner surface of the spin tub is made of stainless steel, the friction of the inner surface is small, and the laundry can be easily taken in and out. In addition, the stainless steel inner surface is hard and hard to be damaged and hardly rust, so that it is difficult for dirt to adhere thereto, and a clean spinning tank for dehydration can be obtained.

According to the second aspect of the present invention, in addition to the effect of the first aspect, there is little adhesion of dirt to the peripheral portion of the drain hole in the stainless steel inner tank, and rust A clean structure that does not occur can be provided. According to the third aspect of the invention, in addition to the effect of the second aspect of the invention, the burring process is performed on each of the drainage holes from the inner surface side, so that the laundry or the like can be washed at the peripheral portion of the drainage hole. There is no danger of small buttons or pins jumping out of the drain holes.

According to the fourth aspect of the present invention, in addition to the effects of the third aspect of the invention, the following operation is achieved. That is, since the protection tank is provided on the outer peripheral surface of the inner tank, the strength of the spin tub for dehydration can be increased by the protection tank, and the thickness of the inner tank made of stainless steel can be reduced. Moreover, since the drainage hole of the protection tank is larger than the drainage hole of the inner tank, a double cylindrical rotating tank consisting of the protection tank and the inner tank can be easily assembled. Further, even when the user's hand touches the outer peripheral surface of the spin tub for dehydration, the hand does not directly touch the inner tub made of stainless steel, so that a safe spin tub for dehydration can be obtained.

According to the fifth aspect of the invention, in addition to the effect of the fourth aspect, the depth of the drain hole of the protection tank is determined by the amount of overhang of the drain hole of the inner tank by burring. By making the protection tank deeper, the portion where the protection tank is burred can be surely protected, so that a more secure dewatering rotary tank can be obtained. According to the manufacturing method of the invention described in claim 6, the inner tank made of stainless steel and the outer tank made of resin are separately configured, and the inner tank is inserted immediately after the outer tank is formed. Can be combined.

According to the manufacturing method of the invention described in claim 7,
In addition to the effect of the invention described in claim 6, by forming the inner tank and the outer tank with a taper having the same gradient, it is easy to insert the inner tank into the outer tank. According to the manufacturing method of the invention described in claim 8, the outer tank can be easily integrated with the outer peripheral surface of the inner tank by insert molding using the inner tank as an insert.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a schematic configuration of a two-tub washing machine according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a dewatering tub of the two-tub washing machine of FIG.

FIG. 3 is an enlarged side sectional view of the dewatering tub of FIG. 1;

FIG. 4 is a side view of a rotary tub of a two-tub washing machine according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Two-tub washing machine 3 Washing tub 21 Bottom part (outer tub, protection tub) 22 Body (outer tub, protection tub) 22a Drainage hole 22c Inner peripheral surface 24 Inner tub 24a Drainage hole 24b Inner peripheral surface (inner surface) 24c Outer surface 40 Rotation tank (rotation tank for dehydration)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takayoshi Akagi 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (8)

[Claims] 1. A spin-drying tub provided in a spin-drying tub of a two-tub washing machine having a washing tub and a spin-drying tub, wherein the spin-drying tub has a large number of drain holes. A spin-drying tub for a two-tub washing machine having an inner surface made of stainless steel. 2. A spin-drying tub for a two-tub washing machine according to claim 1, wherein said spin-drying tub has a cylindrical body and a bottom portion closing a lower portion of said body. Is a rotary tub for dehydration, characterized in that it is provided with an inner tub formed of a stainless steel cylinder forming the inner surface and having a large number of drain holes. 3. A spin-drying tub according to claim 2, wherein each drain hole is burred from the inner surface side. 4. The spin tub according to claim 3, wherein a protective tub is provided on an outer peripheral surface of the inner tub, and the protective tub corresponds to a drain hole of the inner tub. A dewatering rotary tub, wherein a drainage hole larger than the drainage hole of the inner tub is formed at a position where the water is drained. 5. The drainage hole of the protective tub according to claim 4, wherein the outer tub is formed so as to be deeper than the overhang of the outer tub by the burring process of the inner tub. A rotary tub for dehydration, characterized in that the thickness of the part forming the whiskers is set. 6. A method for manufacturing a spin-drying tub provided in a spin-drying tub of a two-tub washing machine having a washing tub and a spin-drying tub, comprising: a stainless steel inner cylindrical tub; A large number of drainage holes are formed in each of the drainage holes, and each drainage hole is formed by burring from the inner surface side, and is an outer tank made of resin having an inner diameter larger than the outer diameter of the inner tank,
Form an outer tank made of resin with a drain hole larger than the drain hole of the inner tank at a position corresponding to the drain hole of the inner tank, and insert the inner tank into the outer tank immediately after the outer tank is formed. A method for producing a spinning tub for dehydration, wherein the inner tub and the outer tub are integrated. 7. The method for manufacturing a dewatering rotary tub according to claim 6, wherein an outer peripheral surface of the inner tub and an inner peripheral surface of the outer tub are formed with tapered surfaces having substantially the same gradient. A method for producing a dewatering rotary tub, wherein the inner tub is easily inserted into the outer tub. 8. A method for manufacturing a spin-drying tub provided in a spin-drying tub of a two-tub washing machine having a spin-drying tub and a spin-drying tub, comprising: a cylindrical inner tub made of stainless steel; A large number of drain holes are formed in the drain hole, and each drain hole is formed by applying burring from the inner surface side.Using this inner tank as an insert, an outer tank made of resin is provided on the outer peripheral surface of the inner tank. A method for producing a dewatering rotary tub, comprising insert molding.