JPH08224397A - Spin basket of washing machine - Google Patents

Abstract

PURPOSE: To enlarge the inside capacity of a spin basket of such a structure that the basket bottom is coupled with the lower part of the drum part, while a specified gap is secured with respect to the outer tub. CONSTITUTION: The lower part of a drum 23 formed cylindrically from a stainless steel plate is coupled in the lapped state with the peripheral wall of the basket bottom 24 in the form of a circular vessel. A threaded hole 28 is provided in the peripheral wall of the basket bottom 24, and a screw insert hole 29 is provided in the drum 23. The part of the hole 29 is made a neck 32 as convex inward, and a recess 33 is formed in the part with hole 28 of the chamber bottom 24. Locating in the circumferential direction and alignment of the hole 29 with the threaded hole 28 are performed by fitting the neck 32 in the recess 33, and in this condition, the caulking part 26 at the bottom of the drum 23 is caulked to the part to be caulked 24a, and also an upper neck 27 is formed by a drawing process, and then a screw 30 is driven fast.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dewatering tub of a washing machine having a cylindrical body formed of a metal plate.

[0002]

2. Description of the Related Art For example, in a washing machine for combined use of dehydration, an inner layer (dehydration tank) arranged inside an outer tub is provided with a tub bottom forming a bottom of the tub, a body forming a body of the tub, and a body There is one configured by combining three members with a balance ring attached to the upper end of the section. The body is formed into a cylindrical shape, for example, a stainless steel thin plate having upper and lower surfaces open,
The tank bottom is made of, for example, plastic in the shape of a circular container.

However, in order to connect the body and the bottom of the tank, a connecting structure as shown in FIG. 6 has been conventionally used. That is, the lower portion of the body portion 1 is positioned so as to cover the outer peripheral surface of the outer peripheral wall portion having a plurality of ribs of the tank bottom portion 2, and the lower end portion of the body portion 1 has an outer periphery over the entire circumference. The caulking piece 3 at the lower end of the wall is caulked inwardly and coupled (this caulking portion is indicated by reference numeral "1a"). Almost at the same time as this caulking process, a portion of the body 1 located at the upper end of the tank bottom 2 is draw-formed inward to form a draw recess 1b over the entire circumference.

[0004] A plurality of screw holes 4 (for example, eight at regular intervals in the circumferential direction) are formed on the outer peripheral wall of the tank bottom 2, whereas the outer peripheral side is passed through the screw insertion holes 1c formed in the body 1. The body portion 1 is screwed to the tank bottom portion 2 at a plurality of points by tightening the screws 5 from the bottom.

On the other hand, as shown in FIG. 7, an outer rounded roll portion 1d is formed on the upper end of the body portion 1, and the roll portion 1d is formed on the outer peripheral wall portion of the balance ring 6. While being in contact with the formed projecting piece 6a, the screw 8 is tightened from the outer peripheral side to the screw hole 7 formed in the outer peripheral wall of the balance ring 6 through the screw insertion hole 1e formed in the body 1. As a result, the balance ring 6 is
It is screwed to.

[0006]

By the way, the dehydration tank as described above is arranged in the outer tank and is rotated at high speed during dehydration. At this time, as shown in FIGS. 6 and 7, It is necessary to secure a gap of a predetermined dimension G between the outer surface of the dehydration tank (body 1) and the inner wall surface 9 of the outer tank. In this case, as shown in FIG. 6, in the lower part of the dehydration tank,
A gap of a predetermined size G is ensured between the head 5a of the screw 5 and the inner wall surface 9 of the outer tub, while as shown in FIG. 7, the head 8a of the screw 8 ( Alternatively, a gap having a predetermined dimension G is secured between the roll portion 1d) and the inner wall surface 9.

Here, in the washing machine, it is desired to increase the amount (capacity) of the laundry that can be accommodated in the dehydration tub at one time without increasing the size of the entire washing machine. It is important to make the size (internal volume) of the dehydration tank as large as possible with respect to the outer tank of the size.

However, in the above-mentioned conventional structure, no special measures have been taken to increase the size of the dehydration tank (inner diameter of the body portion 1), and the outer wall of the body portion 1 is the inner wall surface 9 of the outer tank. It is not necessarily an efficient configuration from the viewpoint of increasing the internal volume of the dehydration tank as much as possible within a limited arrangement space, such as being located at a position G + α (α is, for example, about 5 mm) away from It was

In the conventional joint structure of the body portion 1 and the tank bottom portion 2 (FIG. 6), when the lower end portion of the body portion 1 is caulked, it is circumferentially positioned with respect to the tank bottom portion 2. The positioning convex portion formed by cutting and raising the body portion 1 was fitted into the positioning concave portion provided on the tank bottom portion 2. However, in this case, the configuration of the body portion 1 is relatively small. There were also circumstances where it became complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a washing machine capable of increasing the internal volume while securing a gap of a predetermined size with the outer tub. To provide a dehydration tank.

[0011]

According to a first aspect of the present invention, there is provided a dewatering tub for a washing machine, comprising: a body portion formed of a metal plate in a cylindrical shape;
A bottom part of the body which is connected to the outer peripheral wall part in a circular container shape in a state where the lower part of the body part is wrapped, and the lower end part of the body part is caulked to the caulked part of the outer peripheral wall part of the tank bottom part. In addition, by tightening the screw from the outer peripheral side to the screwed portion of the outer peripheral wall portion of the tank bottom portion through the screw insertion hole formed in the body portion, the body portion and the tank bottom portion are screwed. And a screwing portion on the outer peripheral wall portion of the tank bottom portion, which is provided in the screw insertion hole portion of the body portion, and which is provided with a throttle portion which is convex on the inner peripheral side and accommodates the head portion of the screw. It is characterized in that a concave portion corresponding to the narrowed portion is provided at a portion. In this case, it is more effective if a notch for absorbing stress is formed between the lower end of the body and the narrowed portion in the shape of an elongated hole in the circumferential direction (the invention of claim 2). ).

According to a third aspect of the present invention, there is provided a dehydrator tub for a washing machine, wherein a body portion formed of a metal plate in a cylindrical shape and a ring-shaped outer peripheral wall portion are overlapped with the upper portion of the body portion. A balance ring to be joined, and by tightening a screw from the outer peripheral side to a screw fastening portion of the outer peripheral wall portion of the balance ring through a screw insertion hole formed in the body portion, the body portion and the balance ring It is designed to be screwed, and at the upper end of the body part, a roll part that is rolled into the inside is formed, and at the screw insertion hole part of the body part, it becomes convex on the inner peripheral side. It is characterized in that a throttling portion for accommodating the head portion of the screw is provided.

[0013]

According to the dehydrating tub of the washing machine of claim 1 of the present invention,
Since the throttle portion that is convex on the inner peripheral side is provided in the screw insertion hole portion of the body portion, the head of the screw for screwing the body portion and the tank bottom portion is housed in the throttle portion. Become. Therefore, the entire head of the screw does not protrude from the outer peripheral surface of the cylindrical body, and the whole or at least part of the head of the screw is recessed inward from the outer peripheral surface of the body. It is a form.

Therefore, even if a gap of a predetermined size is secured between the outer tub in which the dehydration tub is housed and the screw head, the size of the gap between the outer tub and the body is set to the above-mentioned predetermined size. The inner diameter of the body portion can be increased as compared with the case where the entire head portion of the screw projects from the outer peripheral surface of the body portion.

Further, since the concave portion is formed in the outer peripheral wall portion of the tank bottom portion corresponding to the narrowed portion of the body portion, by fitting the narrowed portion and the concave portion, the screw insertion hole and the screw fastening portion The alignment can be easily performed. With this,
By fitting the narrowed portion and the recessed portion, it becomes possible to perform circumferential positioning with respect to the tank bottom portion when caulking the lower end portion of the body portion.

In this case, due to the caulking of the lower end of the body, distortion occurs in the vicinity of the lower end of the body, and when tightening the screw, a portion between the caulking part and the screw insertion hole is formed. Although stress concentration may cause deformation and the like, if a notch for absorbing stress is formed between the lower end of the body and the narrowed portion, the hole is elongated in the circumferential direction. (The dehydration tub of the washing machine according to claim 2), the stress concentration thereof is absorbed by the notch, so that the occurrence of deformation or breakage can be prevented.

Further, according to the dehydration tub of the washing machine of claim 3 of the present invention, since the roll portion formed at the upper end portion of the body portion is rolled inward, the roll portion is the outer peripheral wall of the body portion. It can be done without protruding from the part to the outer peripheral side.
Along with this, since the head of the screw for screwing the body and the balance ring is housed in the narrowed portion, it is between the outer tank in which the dehydration tank is housed and the screw head. Even if the gap having the predetermined size is secured, the size of the gap between the outer tank and the body can be set to the predetermined size or a size close thereto. Therefore, the inner diameter of the body can be increased.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a washing machine combined with dehydration will be described below with reference to FIGS.
First, the overall schematic configuration of the washing machine (dehydrating and washing machine) 11 according to this embodiment will be described with reference to FIG. An outer tank (water receiving tank) 13 is provided in the outer box 12 having a substantially rectangular box shape via a suspension mechanism 14. In the outer tub 13, a dehydrating tub 15 according to the present embodiment for accommodating laundry (not shown) is provided, and an agitator 16 is provided at the inner bottom of the dehydrating tub 15. The dehydration tank 15 will be described in detail later.

A motor 17 serving as a drive source is provided downward on the outer bottom of the outer tub 13, and the rotational force of the motor 17 is transmitted via a belt 18 or the like to the dehydration tub 15 and the stirring. A mechanism unit 19 that rotationally drives the body 16 is provided. As is well known, in the process of washing and rinsing by the motor 17 and the mechanism portion 19 and the like,
The stirring body 16 is rotated in the normal and reverse directions, and the dehydration tank 15 is rotated at high speed together with the stirring body 16 in the dehydration process. A drain hose 20 is connected to the bottom of the outer tub 13, and a drain valve 21 is provided in the middle of the drain hose 20.

On the other hand, a top cover 22 is provided on the upper portion of the outer box 12. Although illustration and detailed description are omitted, the top cover 22 is provided with a laundry inlet / outlet and a lid for opening / closing the laundry inlet and outlet, and a water supply mechanism including a water supply valve is provided on the back side. On the front side, an operation panel including various switches and a display device, a control device including a microcomputer, and the like are provided.

As shown in FIG. 4 and the like, the dehydration tank 15 is roughly divided into a body portion 23, a tank-shaped bottom portion 24 in the shape of a circular container joined to the lower end portion of the body portion 23, and the body portion. Two
Ring-shaped balance ring 25 connected to the upper end of
It is configured by including three members. Of these, the body 23
Is formed in the shape of a cylinder whose upper and lower surfaces are open from a metal plate such as a stainless plate, and a large number of dehydration holes (not shown) are formed on the peripheral wall surface thereof.

The tank bottom 24 is made of, for example, plastic in the shape of a circular container, and has a plurality of ribs extending horizontally on the outer peripheral side of the outer peripheral wall thereof, as shown in FIG. Has been done. The body portion 23 is joined by caulking and screwing as will be described later in a state where the lower portion thereof is wrapped with the outer peripheral wall portion of the tank bottom portion 24. Further, as is well known, the balance ring 25 is configured by containing a liquid in a hollow annular main body made of plastic. The body portion 23 is adapted to be screwed and coupled as described later in a state where the upper portion of the body portion 23 overlaps the outer peripheral wall portion of the balance ring 25.

Here, the connecting structure of the body portion 23, the tank bottom portion 24 and the balance ring 25 will be described with reference to FIGS. As shown in FIG. 1, the tank bottom 2
Among the ribs of the outer peripheral wall of No. 4, the rib located at the lowermost end is the crimped portion 24a, and the entire lower end circumference of the body portion 23 (referred to as crimped portion 26) is crimped to the crimped portion 24a. It is supposed to be done. Furthermore, with this,
An upper throttle portion 27, which is convex inward over the entire circumference, is formed on the body portion 23 so as to ride on the upper end portion of the tank bottom portion 24.

Further, on the outer peripheral wall portion of the tank bottom portion 24, for example, screw holes 28 as screwing portions are formed at eight positions at equal intervals in the circumferential direction, and the body portion 23 is formed. 2 has screw insertion holes 29 corresponding to the screw holes 28 as shown in FIG. Now screw 30
The body portion 23 and the tank bottom portion 24 are screwed and fixed by tightening from the outer peripheral side to the screw hole 28 through the screw insertion hole 29. A washer 31 is provided between the head portion 30 a of the screw 30 and the body portion 23.

At this time, in the screw insertion hole 29 portion of the body portion 23, a narrowed portion 32 is formed in a circular shape such that the portion including the peripheral portion thereof is convex toward the inner peripheral side. In this case, the depth of the narrowed portion 32 is set such that the head portion 30a of the screw 30 is substantially accommodated. On the other hand, the tank bottom 2
The outer peripheral wall of No. 4 is provided with a recess 33 located at the screw hole 28 and into which the narrowed portion 32 is fitted.
In this case, as shown in FIG. 2, the concave portion 33 is formed in a concave groove shape extending in the vertical direction from the upper end of the outer peripheral wall portion to the upper portion of the crimped portion 24a.

Further, in the present embodiment, as shown in FIG. 2, a notch portion 34 for absorbing stress is located at an intermediate position between the narrowed portion 32 of the body portion 23 and the crimp portion 26 (lower end portion).
Is formed in an elongated oval shape in the circumferential direction. In addition, here, also in the intermediate portion between the narrowed portion 32 of the body portion 23 and the upper narrowed portion 27, the upper notch 3 which is also elongated in the circumferential direction is also formed.
5 is formed.

The diameter of the lower portion of the body portion 23 is, as shown in FIG. 1, the narrowed portion 32 and the upper narrowed portion 2.
Except for 7, the maximum dimension is such that a gap of a predetermined dimension G is secured between the outer peripheral surface and the inner wall surface of the outer tub 13. The outer diameter of the outer peripheral wall portion of the tank bottom portion 24 is set to a size that is in close contact with the inner peripheral surface of the body portion 23 except for the concave portion 33.

On the other hand, as shown in FIG. 3, a roll portion 36 for ensuring strength is formed at the upper end of the body portion 23 so as to be rolled inward. Further, a projecting piece portion 25a with which the roll portion 36 abuts is formed on the outer peripheral wall portion of the balance ring 25 over the entire circumference.

Further, on the outer peripheral wall portion of the balance ring 25, there are screw holes 37 as screwing portions, which are located at slightly lower positions of the projecting piece portion 25a, for example, at eight positions at equal intervals in the circumferential direction. Each of the screw holes 3 is formed in the body portion 23.
Corresponding to No. 7, screw insertion holes 38 are provided. At this time, the outer peripheral wall surface of the balance ring 25, that is, the opening end portion of the screw hole 37 is located inside the inner peripheral surface of the body portion 23 with a gap, but the screw insertion hole 38 of the body portion 23 is formed. In the portion, a portion including the peripheral portion thereof is formed in a circular shape so as to be convex toward the inner peripheral side and contact the outer peripheral wall surface of the balance ring 25.

By tightening the screw 40 from the outer peripheral side to the screw hole 37 through the screw insertion hole 38, the body portion 23 and the balance ring 25 are screwed together. A washer 41 is provided between the head portion 40 a of the screw 40 and the body portion 23. At this time, a predetermined dimension G is provided between the outer peripheral surface of the upper portion of the body portion 23 and the inner wall surface of the outer tub 13, and between the head portion 40a of the screw 40 and the inner wall surface of the outer tub 13. Gap is formed.

Next, the operation of the above configuration will be described. The assembling work of the dehydration tank 15 is performed as follows. That is, first, the lower portion of the body portion 23 is fitted into the outer peripheral wall portion of the tank bottom portion 24 in a state where the caulking portion 26 and the upper narrowed portion 27 are not formed. At this time, each throttle portion 32 that is convex on the inner peripheral side is formed into the concave portion 3 on the outer peripheral wall portion of the tank bottom portion 24.
By fitting them in the state of being aligned with 3, the body portion 23 is positioned in the circumferential direction with respect to the tank bottom portion 24. Along with this, the screw insertion holes 29 are wrapped in the screw holes 28 so that the screw holes 28 are aligned with each other, so that the circumferential positioning of the caulking process and the screw fixing position are performed at the same time. is there.

In such a positioning state, a work for crimping the lower end of the body portion 23 to the caulked portion 24a of the tank bottom portion 24 is performed, and at the same time as this work, the upper end portion of the tank bottom portion 24 of the body portion 23 is caulked. The squeezing work of the portion located at is performed. As a result, as shown in FIG. 1, the caulking portion 26 and the upper narrowing portion 27 are formed, and the body portion 23 and the tank bottom portion 24 are caulked and coupled. Thereafter, the body portion 23 and the tank bottom portion 24 are screwed by the screw 30.

However, due to the caulking of the lower end of the body portion 23, distortion occurs in the vicinity of the caulking portion 26, and when the screw 30 is tightened, the caulking portion 26 of the body portion 23 and the screw insertion hole are formed. It is conceivable that stress concentration may occur in the portion between 29 (throttle portion 32) and deformation or the like may occur. Further, there is a situation in which similar distortion occurs during drawing of the upper drawn portion 27, and stress is concentrated in a portion between the upper drawn portion 27 and the screw insertion hole 29 when the screw 30 is tightened. However, in this embodiment, the notch 34
Further, since the upper cutout portion 35 is provided, the stress concentration is absorbed by the cutout portion 34 and the upper cutout portion 35, and the occurrence of deformation or breakage is prevented.

When the body portion 23 and the tank bottom portion 24 are caulked and screwed together in this manner, the balance ring 25 is then joined to the upper portion of the body portion 23. In this work, the lower portion of the balance ring 25 is fitted into the body portion 23 until the protruding piece portion 25a comes into contact with the upper end of the roll portion 36, and then the screw hole 37 and the screw insertion hole 38 are aligned. so,
This is done by tightening the screw 40. As a result, the dehydration tank 15 in which the body portion 23, the tank bottom portion 24, and the balance ring 25 are combined is obtained.

By the way, in the present embodiment, as shown in FIG. 1, in the lower portion of the body portion 23, the screw insertion hole 29 is provided with the throttle portion 32 which is convex toward the inner peripheral side, and the head portion 30 of the screw 30 is provided.
Since a is accommodated in the narrowed portion 32, even if a gap of a predetermined dimension G is secured between the outer tub 13 and the screw head 30a, the outer tub 13 and the body 23 are separated from each other. The size of the gap can also be set to the predetermined size G, as shown in FIG.
Compared with the conventional case where the entire head portion 5a of the screw 5 is projected from the outer peripheral surface of the body portion 1 as shown in FIG.
It was possible to increase the inner diameter of the.

On the other hand, as shown in FIG. 3, even at the upper part of the body portion 23, the roll portion 3 formed on the upper end portion of the body portion 23.
Since 6 is rolled inward, the roll portion 36
Does not need to protrude from the outer peripheral wall of the body portion 23 to the outer peripheral side, and at the same time, the head portion 40a of the screw 40
Since it is housed in the narrowed portion 39, the inner diameter of the body portion 23 can be increased in comparison with the conventional one shown in FIG. Of.

As described above, according to this embodiment, the diameter of the body portion 23, and hence the size of the dehydration tank 15 (compared to the conventional one) is ensured while maintaining a gap of a predetermined size G with the outer tank 13. The internal volume) can be increased, and the demand for increasing the internal volume of the dehydration tub 15 within the limited arrangement space can be sufficiently satisfied.

In this embodiment, since the concave portion 33 is formed in the outer peripheral wall portion of the tank bottom portion 24 corresponding to the narrowed portion 32 of the body portion 23, by fitting the narrowed portion 32 and the concave portion 33, Positioning in the circumferential direction with respect to the tank bottom portion 24 at the time of caulking and position adjustment of the screw insertion hole 38 and the screw hole 37 can be performed at the same time, and an advantage that the configuration therefor can be simplified can be obtained. Of.

Further, particularly in the present embodiment, the stress absorbing notch 34 is formed at the lower portion of the throttle portion 32 of the body portion 23, and the upper notch portion 35 is also formed at the upper portion of the throttle portion 32. Since this is done, the stress concentration at the time of tightening the screw 30 can be absorbed, and the occurrence of deformation and breakage can be prevented in advance.

Although the notch 34 and the upper notch 35 are formed in the body portion 23 in the above embodiment, the notch may be provided in only one of the notches 34, and is particularly modified. And the like are not a problem, the notch 34,
It is not always necessary to provide 35. Further, in the above-described embodiment, the diameter of the body portion 23 is increased in both the upper portion and the lower portion of the body portion 23 by the throttle portion 32 and the throttle portion 39. However, the configuration in which the throttle portion is provided in only one of them Even in this case, the diameter of the body portion 23 in that portion can be increased, and the intended purpose can be achieved. In addition, the present invention can be appropriately modified and implemented within the scope of the present invention.

[0041]

As is apparent from the above description, the present invention has the following excellent effects.
That is, according to the dehydration tub of the washing machine of claim 1, in the case where the bottom of the body is joined to the lower part of the body by crimping and screwing, the body is located at the screw insertion hole portion of the body and is convex toward the inner peripheral side. Since a throttling part for accommodating the head of the screw is provided and a recess corresponding to the throttling part is provided at the screwing part of the outer peripheral wall of the bottom of the tank, a predetermined size is provided between the outer tank and the outer tank. It is possible to increase the internal volume while ensuring the gap, and at the same time, it is possible to perform circumferential positioning of the body part with respect to the bottom of the tank during caulking and position the screw insertion hole and the screw hole at the same time. It is possible.

In this case, a stress absorbing notch having a long hole in the circumferential direction may be provided between the lower end of the body and the narrowed portion. It is possible to absorb stress concentration at the time of tightening the water tank) and the screw, and prevent occurrence of deformation and breakage in advance.

Further, according to the dehydrating tub of the washing machine of claim 3, in which the balance ring is coupled to the upper part of the body by screwing, the roll part which is rolled inward is formed at the upper end of the body. At the same time, since a throttle portion that is located on the screw insertion hole portion of the body portion and that is convex on the inner peripheral side and that accommodates the head of the screw is provided, while maintaining a gap of a predetermined size with the outer tank. Also, the internal volume can be increased.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and is an enlarged vertical side view showing a joint structure of a body and a tank bottom.

FIG. 2 is an enlarged front view showing a peripheral portion of a diaphragm portion.

FIG. 3 is an enlarged vertical side view showing a connecting structure of a body portion and a balance ring.

[Fig. 4] Vertical side view of the dehydration tank

[Figure 5] Vertical side view of the washing machine

FIG. 6 is a view corresponding to FIG. 1 showing a conventional example.

FIG. 7 is a view corresponding to FIG. 3 showing a conventional example.

[Explanation of symbols]

In the drawing, 11 is a washing machine, 13 is an outer tub, 15 is a dewatering tub, and 2
3 is a body part, 24 is a tank bottom part, 24a is a caulked part, 25 is a balance ring, 25a is a protruding piece part, 26 is a caulked part, 2
7 is an upper squeezing portion, 28 is a screw hole (screw stop portion), 29
Is a screw insertion hole, 30 is a screw, 30a is a head portion, 32 is a narrowed portion, 33 is a recessed portion, 34 is a cutout portion, 35 is an upper cutout portion, 3
6 is a roll part, 37 is a screw hole (screw stop part), 38 is a screw insertion hole, 39 is a throttle part, 40 is a screw, and 40a is a head part.

Claims (3)

[Claims] 1. A body portion formed of a metal plate in a cylindrical shape,
A tank bottom part which is formed in a circular container shape and is joined to an outer peripheral wall part in a state where the lower part of the body part is wrapped, and a lower end part of the body part is caulked to a caulked part of an outer peripheral wall part of the tank bottom part. In addition, by tightening screws from the outer peripheral side to the screw fastening portion of the outer peripheral wall portion of the tank bottom portion through the screw insertion holes formed in the body portion, the body portion and the tank bottom portion are screwed. A screwing portion of the outer peripheral wall portion of the tank bottom portion is provided, the throttle portion being provided in the screw insertion hole portion of the body portion and protruding toward the inner peripheral side to accommodate the head portion of the screw. A dewatering tub for a washing machine, characterized in that a recess corresponding to the narrowed portion is provided in the portion. 2. The washing machine according to claim 1, wherein a notch for absorbing stress is formed between the lower end of the body and the narrowed portion, the notch being in the shape of an elongated hole in the circumferential direction. Machine dewatering tank. 3. A body portion formed of a metal plate in a cylindrical shape,
A balance ring which is ring-shaped and is joined to the outer peripheral wall portion in a state where the upper portion of the body portion is wrapped, and a screw is passed through a screw insertion hole formed in the body portion of the outer peripheral wall portion of the balance ring. By tightening from the outer peripheral side to the screw fastening portion, the body portion and the balance ring are screwed together, and at the upper end portion of the body portion, a roll portion rolled inward is formed, and A dewatering tub for a washing machine, comprising a squeezing portion which is located at a screw insertion hole portion of a body portion and which is convex on an inner peripheral side and accommodates the head portion of the screw.