KR100617216B1 - device for insulation of vibration in drum washing machine - Google Patents

device for insulation of vibration in drum washing machine Download PDF

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Publication number
KR100617216B1
KR100617216B1 KR1019990045322A KR19990045322A KR100617216B1 KR 100617216 B1 KR100617216 B1 KR 100617216B1 KR 1019990045322 A KR1019990045322 A KR 1019990045322A KR 19990045322 A KR19990045322 A KR 19990045322A KR 100617216 B1 KR100617216 B1 KR 100617216B1
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South Korea
Prior art keywords
vibration
outer tub
washing machine
housing
drum washing
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KR1019990045322A
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Korean (ko)
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KR20010037669A (en
Inventor
김재겸
권호철
박종아
최강모
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엘지전자 주식회사
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Priority to KR1019990045322A priority Critical patent/KR100617216B1/en
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/02—Rotary receptacles, e.g. drums
    • D06F37/04—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a horizontal or inclined axis
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/267—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups
    • D06F37/268—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups for suspension devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/08—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other
    • F16F7/09—Vibration-dampers; Shock-absorbers with friction surfaces rectilinearly movable along each other in dampers of the cylinder-and-piston type

Abstract

본 발명은 드럼세탁기에 관련한 것으로서, 특히 외조의 전후 진동을 억제하기 위한 진동방지장치에 관한 것이다.The present invention relates to a drum washing machine, and more particularly, to an anti-vibration device for suppressing the front and rear vibration of the outer tub.

이를 위해, 본 발명은 외조와 외체를 연결하되, 연결방향이 외조로부터 외체를 향할수록 점진적으로 상향 경사지도록 연결하여 외조의 전,후 및 상, 하방향 진동을 동시에 저감되도록 댐퍼수단이 구비되되, 상기 댐퍼수단은 외조의 후방 또는 외체중 어느 하나에 일단이 힌지 구조에 의해 회전가능하게 결합된 하우징과, 상기 외조의 후방 또는 외체중 다른 하나에 일단이 힌지 구조에 의해 회전가능하게 결합되고 타단은 상기 하우징의 내면과 마찰되도록 결합된 마찰 피스톤으로 구성된 것을 특징으로 하는 드럼세탁기의 진동방지장치를 제공한다.To this end, the present invention is connected to the outer shell and the outer body, the connection direction is provided with a damper means to simultaneously reduce the front, rear and up and down vibrations of the outer tub by connecting so as to gradually incline upward from the outer tub to the outer body, The damper means is rotatably coupled to one of the housing or the outer end of the outer tub by a hinge structure, and one end of the damper structure is rotatably coupled to the other of the rear or outer body of the outer tub and the other end is It provides a vibration washing device of the drum washing machine, characterized in that consisting of a friction piston coupled to friction with the inner surface of the housing.

드럼세탁기, 진동방지장치Drum Washing Machine, Vibration Prevention Device

Description

드럼세탁기의 진동방지장치{device for insulation of vibration in drum washing machine}Device for insulation of vibration in drum washing machine

도 1은 일반적인 드럼세탁기의 일예를 도시한 종단면도1 is a longitudinal sectional view showing an example of a general drum washing machine

도 2는 본 발명에 따른 드럼세탁기를 도시한 종단면도Figure 2 is a longitudinal sectional view showing a drum washing machine according to the present invention

도 3은 외조의 상,하 진동력과 전,후 진동력의 합력(合力)도Figure 3 is a combination of the upper and lower vibration force of the outer shell and the front and rear vibration force

도 4는 본 발명에 따른 댐퍼를 상세 도시한 종단면도Figure 4 is a longitudinal cross-sectional view showing in detail the damper according to the present invention

도 5는 본 발명에 따른 댐퍼에 의해 외조의 전,후 진동이 저감된 정도를 보인 그래프Figure 5 is a graph showing the degree to which the vibration before and after the outer tank is reduced by the damper according to the present invention

도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings

1. 외체 3. 외조1. external 3. external

20. 하우징 30. 마찰 피스톤20. Housing 30. Friction piston

31. 마찰부 h1, h2. 힌지점31. Friction h 1 , h 2 . Hinge point

본 발명은 드럼세탁기에 관련한 것으로서, 특히 외조의 전후 진동을 억제하 기 위한 진동방지장치에 관한 것이다.The present invention relates to a drum washing machine, and more particularly, to a vibration preventing device for suppressing front and rear vibration of the outer tub.

일반적으로 세탁기는 판형의 펄세이터를 회전시킴에 따라 발생된 수류에 의해 세탁을 행하는 펄세이터형 세탁기와, 눕혀진 통체의 회전력에 의해 세탁을 행하는 드럼(drum) 세탁기로 대별된다.Generally, a washing machine is roughly classified into a pulsator type washing machine which washes by water flow generated by rotating a plate-type pulsator, and a drum washing machine which washes by the rotational force of a lying down cylinder.

특히, 상기 드럼세탁기는 도 1에서와 같이 외체(1)와, 상기 외체내에 지지된 원통형의 외조(3)와, 상기 외조내에 회전 가능하게 설치되며 세탁물이 수용되는 원통형의 내조(5)와, 상기 내조를 구동시키기위한 구동부로 크게 구성되어 있다.In particular, the drum washing machine as shown in Figure 1, the outer body 1, the cylindrical outer tub 3 supported in the outer body, the cylindrical inner tub 5 rotatably installed in the outer tub and accommodates laundry; It is largely composed of a drive unit for driving the inner tank.

그리고, 상기 내조(5)가 회전할 때 발생되는 외조(3)의 진동을 억제하기 위해, 외체(1)의 상부와 외조(3)가 복수개의 스프링(7)에 의해 연결되어 있으며, 외체(1)와 외조(3)의 하부는 마찰식(friction type) 댐퍼(이하 "댐퍼"라 함)(9)에 의해 연결되어 있다.In addition, in order to suppress vibration of the outer tub 3 generated when the inner tub 5 rotates, the upper part of the outer tub 1 and the outer tub 3 are connected by a plurality of springs 7, 1) and the lower part of the outer tub 3 are connected by a friction type damper (hereinafter referred to as "damper") 9.

이를 포함하여 구성된 드럼세탁기는 세탁시에 구동부로부터 전달되는 동력에 의해 내조(5)가 저속회전되면서 세탁물과의 마찰력에 의해 세탁을 수행하게 되며, 탈수시에는 구동부로부터 전달되는 동력에 의해 내조(5)가 고속회전됨에 따른 원심력에 의해 세탁물의 물기를 제거하게 된다.The drum washing machine configured to include the inner tub 5 is rotated at a low speed by the power transmitted from the driving unit during washing to perform the washing by the friction force with the laundry, and when dewatering, the drum washing machine is driven by the power transmitted from the driving unit. ) Is dried by the centrifugal force as the high speed is rotated.

한편, 상기 내조(5)는 세탁 및 탈수시에 세탁물 중량에 의해 무게가 실린쪽으로 편중되면서 불균형 회전을 하게 되고, 이러한 불균형 회전은 내조(5)의 외측에 설치된 외조(3)로 전달되어 외조의 진동 및 소음의 원인으로 작용되어 왔다.On the other hand, the inner tank (5) is unbalanced rotation while being biased toward the weight carried by the weight of the laundry during washing and dehydration, this unbalanced rotation is transmitted to the outer tank (3) installed on the outside of the inner tank (5) It has been the cause of vibration and noise.

이 때, 상기 외조(3)의 상부 양측에는 스프링(7)이 설치되어 있고, 하부 양측에는 마찰식 댐퍼(9)가 설치되어 있어, 외조(3)가 진동될 때 댐퍼(9)의 마찰력에 의해 진동을 감쇠시키고, 스프링(7)은 그 탄성한계 범위내에서 외조(3)의 유동을 허용하면서 외조의 완충역할을 동시에 하게 된다.At this time, springs 7 are provided on both upper sides of the outer tub 3, and friction dampers 9 are installed on both sides of the outer tub 3, so that when the outer tub 3 vibrates, frictional force of the damper 9 is applied. Thereby damping vibration, and the spring 7 simultaneously acts as a buffer of the outer tub while allowing the flow of the outer tub 3 within its elastic limit.

한편, 내조(5)가 고속회전되는 탈수기동 초기에는 내조의 회전이 안정화 되기 이전상태, 즉 과도진동상태가 되는데, 이러한 과도진동상태에서는 외조(3)에는 상,하 진동 뿐만 아니라 전,후 진동을 함께 수반하게 된다.On the other hand, in the initial stage of the dehydration operation in which the inner tank 5 rotates at a high speed, the inner tank is in a state before the rotation is stabilized, that is, a transient vibration state. Will accompany it.

그러나, 종래의 드럼세탁기에는 댐퍼(9)가 외조(3)의 하부에만 상하 방향으로 설치되어 있으므로 외조(3)의 상,하 진동은 어느 정도 감할 수 있지만, 전,후 진동은 별도의 방지수단을 갖고 있지 않으므로 완전한 진동감쇠가 이루어지지 않고 있는 실정이다.However, in the conventional drum washing machine, since the damper 9 is installed only in the lower portion of the outer tub 3 in the up and down direction, the upper and lower vibrations of the outer tub 3 can be reduced to some extent. Since it does not have a complete vibration attenuation situation.

특히, 외조(3)의 전,후 진동에 따라 외조와 외체(1)가 충돌되면서 소음의 원인이 되고 있음은 물론, 상기한 충돌력에 의해 세탁기 자체가 설치장소로 부터 이동되는 워킹(walking)현상이 발생되는 문제점을 안고 있었다.In particular, the outer shell and the outer shell 1 collide with the front and rear vibrations of the outer tub 3 to cause noise, as well as the walking that moves the washing machine itself from the installation place by the collision force. I had a problem that occurred.

본 발명은 상기와 같은 종래의 문제점을 해결하기 위해 안출한 것으로서, 외조의 전,후방향 진동을 감쇠시킬 수 있는 드럼세탁기의 진동방지장치를 제공하는데 그 목적을 두고 있다.The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide a drum washing machine vibration damping device capable of damping the front and rear vibration of the outer tank.

상기 목적을 달성하기 위한 본 발명의 형태에 따르면,
외조와 외체를 연결하되, 연결방향이 외조로부터 외체를 향할수록 점진적으로 상향 경사지도록 연결하여 외조의 전,후 및 상, 하방향 진동을 동시에 저감되도록 댐퍼수단이 구비되되, 상기 댐퍼수단은 외조의 후방 또는 외체중 어느 하나에 일단이 힌지 구조에 의해 회전가능하게 결합된 하우징과, 상기 외조의 후방 또는 외체중 다른 하나에 일단이 힌지 구조에 의해 회전가능하게 결합되고 타단은 상기 하우징의 내면과 마찰되도록 결합된 마찰 피스톤으로 구성된 것을 특징으로 하는 드럼세탁기의 진동방지장치가 제공된다.According to an aspect of the present invention for achieving the above object,
The outer tank and the outer body is connected, but the connecting direction is gradually inclined upward as the direction from the outer tank to the outer body is provided with damper means to simultaneously reduce the front, rear, and up and down vibrations of the outer tank. A housing rotatably coupled to one of the rear or outer bodies by a hinge structure, and one end rotatably coupled to the other of the rear or outer body of the outer tub by a hinge structure and the other end is frictionally engaged with the inner surface of the housing. An anti-vibration device of a drum washing machine is provided, which is composed of a friction piston coupled to each other.

삭제delete

이하, 본 발명의 바람직한 실시예를 첨부된 도 2 내지 도 5를 참조하여 보다 상세히 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to FIGS. 2 to 5 as follows.

도 2에 따르면, 본 발명은 외조(3)의 전,후방향 진동을 억제하기 위해, 외조(3)와 외체(1)를 외조의 전,후 진동방향과 일치하는 방향으로 설치된 댐핑수단에 의해 연결한 것을 특징으로 하고 있다.According to FIG. 2, the present invention is provided by damping means provided with the outer tub 3 and the outer shell 1 in a direction coinciding with the front and rear oscillation directions of the outer tub in order to suppress the front and rear vibrations of the outer tub 3. It is characterized by the connection.

이 때, 외조(3)의 전,후 진동방향은 외조(3)의 축방향과 거의 일치하므로 댐핑수단을 외조(3)의 축방향과 나란하게 설치하는 것이 바람직 하며, 보다 바람직 하기로는 도 2의 "A"부와 같이 댐핑수단을 외조로부터 외체를 향할수록 상향 경사지게 설치하는 것이 좋다.At this time, since the vibration direction before and after the outer tub 3 substantially coincides with the axial direction of the outer tub 3, it is preferable to install the damping means in parallel with the axial direction of the outer tub 3, more preferably FIG. 2. As in the "A" portion of the damping means it is better to install the inclined upward toward the outer body from the outer tank.

상기에서 댐핑수단을 경사지게 설치한 후자의 경우에는 외조(3)의 전,후진동을 억제하는 기능뿐만 아니라, 외조(3)의 상,하 진동을 억제하는 기능을 동시에 수행할 수 있으므로 댐핑수단을 축방향과 나란하게 설치한 전자의 설치형태보다는 바람직 하다고 할 수 있다.In the latter case in which the damping means is inclined, the damping means can be simultaneously suppressed not only before and after vibration of the outer tub 3, but also at the same time. It can be said that it is preferable to the installation form of the electron installed in parallel with an axial direction.

구체적으로, 도 3에 도시된 바와 같이 외조(3)의 전,후 진동력을 Z라 하고, 외조(3)의 상,하 진동력을 Y라 할 때, 이들의 합력방향인 YZ 방향으로 댐핑수단을 설치하게 되면 Z방향의 힘과 Y방향의 힘에 대한 동시 대항력을 가지게 된다.Specifically, as shown in FIG. 3, when the vibration force before and after the outer tub 3 is referred to as Z, and the upper and lower vibration forces of the outer tub 3 are referred to as Y, the damping is performed in the YZ direction, which is their joint direction. When the means are installed, they have a simultaneous counter force against the force in the Z direction and the force in the Y direction.

이에 따라, 외조(3)의 상,하 진동은 외조(3)의 하부에 설치된 댐퍼(9)와 더불어 댐핑력을 배가시킬 수 있으며, 아울러 전,후 진동도 함께 저감시킬 수 있게 된다.Accordingly, the upper and lower vibrations of the outer tub 3 can double the damping force with the damper 9 installed at the lower part of the outer tub 3, and also reduce the front and rear vibrations together.

한편, 상기 댐핑수단은 도 4에 도시된 바와 같이 외조(3)의 후방 또는 외체(1)중 어느 하나에 일단이 힌지 결합된 통형(筒形)의 하우징(20)과, 상기 외조(3)의 후방 또는 외체(1)중 다른 하나에 일단이 힌지 결합되고 타단은 상기 하우징(20)의 내면과 마찰을 일으키도록 결합된 마찰 피스톤(30)으로 구성된다.Meanwhile, the damping means includes a tubular housing 20 having one end hinged to either the rear of the outer tub 3 or the outer body 1 as shown in FIG. 4, and the outer tub 3. One end is hinged to the other one of the rear or the outer body (1) and the other end is composed of a friction piston (30) coupled to friction with the inner surface of the housing (20).

그리고, 상기 마찰 피스톤(30)의 하우징(20)과의 접촉부분에는 마찰부(31)가 구비되어 하우징(20)과의 접촉을 통해 마찰되면서 외조(3)의 유동력에 대한 저항력을 발생시키게 된다.In addition, a friction part 31 is provided at the contact portion of the friction piston 30 with the housing 20 to generate resistance force against the flow force of the outer tub 3 while rubbing through the contact with the housing 20. do.

이 때, 상기 댐핑수단의 마찰력은 상기 마찰부(31)의 면적과, 하우징(20)과 마찰부(31)와의 계면(界面) 거칠기에 비례하므로 이를 적절히 조절하면 외조(3)의 유동력에 상응하는 대항 마찰력을 얻을 수 있다.At this time, the frictional force of the damping means is proportional to the area of the frictional portion 31 and the interface roughness between the housing 20 and the frictional portion 31. Corresponding counter friction can be obtained.

이러한 댐핑수단의 구성으로부터, 외조(3)가 전,후 방향으로 진동을 일으키게 되면 그 진동력이 마찰 피스톤(30)으로 전달되면서 마찰 피스톤은 하우징(20) 내에서 진동주기에 따라 직선왕복운동을 하게 된다.From the configuration of such damping means, when the outer tub 3 causes vibration in the front and rear directions, the vibration force is transmitted to the friction piston 30, and the friction piston performs linear reciprocating movement in accordance with the vibration period in the housing 20. Done.

이에 따라, 상기 마찰 피스톤(30)과 하우징(20)의 내면은 마찰력을 일으킬 수 있도록 접촉된 상태이므로 마찰 피스톤(30)이 하우징(20)의 내면을 따라 왕복운동하는 과정에서 이 들간의 진동력에 대항하는 마찰력에 의해 외조(3)의 진동을 억제하게 된다.Accordingly, since the inner surfaces of the friction piston 30 and the housing 20 are in contact with each other so as to generate a friction force, the vibration force between the friction piston 30 in the process of reciprocating along the inner surface of the housing 20. The vibration of the outer tub 3 is suppressed by the frictional force which opposes.

아울러, 상기 하우징(20)과 마찰 피스톤(30)은 각각의 지지물에 대해 힌지 결합되어 있다.In addition, the housing 20 and the friction piston 30 are hinged to each support.

이는 외조(3)의 진동방향이 실제로는 불규칙성을 띠고 있으므로, 설사 외조 가 예기치 않는 방향으로 진동되더라도 각각의 힌지점(h1,h2)을 기준으로 하우징(20)과 마찰 피스톤(30)의 회전각도가 미세조절되면서 하우징(20)을 기준한 마찰 피스톤(30)의 마찰 슬라이딩이 원활하게 이루어지도록 하기 위한 것이다.This is because the vibration direction of the outer tub 3 is actually irregular, so even if the outer tub oscillates in an unexpected direction, the housing 20 and the friction piston 30 of the housing 20 and the friction piston 30 are based on the respective hinge points h 1 and h 2 . While the rotation angle is finely adjusted so that the friction sliding of the friction piston 30 relative to the housing 20 is made smoothly.

만약, 댐핑수단을 이루는 하우징(20)과 마찰 피스톤(30)이 회동 불가능한 상태로 각각의 지지물에 고정되어있다면, 하우징(20)에 대한 마찰 피스톤(30)의 슬라이딩 방향이 하우징(20)의 축방향에 한정될 수 밖에 없으므로 외조(3)의 불규칙한 진동에 대해 마찰 피스톤(30)의 원활한 마찰 슬라이딩을 이룰 수 없게 된다.If the housing 20 and the friction piston 30 constituting the damping means are fixed to the respective supports in a non-rotatable state, the sliding direction of the friction piston 30 relative to the housing 20 is the axis of the housing 20. Since it is limited to the direction, smooth frictional sliding of the friction piston 30 cannot be achieved against irregular vibration of the outer tub 3.

따라서, 원하는 마찰력을 얻을 수 없을 뿐만 아니라, 외조(3)의 불규칙한 진동의 영향으로 댐핑수단이 파손되거나 수명이 단축되는 문제점이 발생하게 된다.Therefore, not only the desired frictional force is not obtained, but also the problem that the damping means is damaged or the service life is shortened due to the irregular vibration of the outer tub 3 is caused.

이상과 같은 본 발명은 외조의 진동, 특히 전,후방향 상,하진동을 동시에 억제할 수 있으므로 세탁 및 탈수시에 발생되었던 진동소음을 저감시킬 수 있는 장점을 갖추게 된다.The present invention as described above can suppress the vibration of the outer tank, in particular, the front, rear direction up and down vibration at the same time has the advantage of reducing the vibration noise generated during washing and dehydration.

Claims (4)

외조와 외체를 연결하되, 연결방향이 외조로부터 외체를 향할수록 점진적으로 상향 경사지도록 연결하여 외조의 전,후 및 상, 하방향 진동을 동시에 저감되도록 댐퍼수단이 구비되되, The damper means is connected to the outer tank and the outer body, and the connection direction is gradually inclined upward from the outer tank to the outer body so as to simultaneously reduce the front, rear, and up and down vibrations of the outer tank. 상기 댐퍼수단은The damper means 외조의 후방 또는 외체중 어느 하나에 일단이 힌지 구조에 의해 회전가능하게 결합된 하우징과,A housing having one end rotatably coupled by a hinge structure to either the rear or the outer body of the outer tub; 상기 외조의 후방 또는 외체중 다른 하나에 일단이 힌지 구조에 의해 회전가능하게 결합되고 타단은 상기 하우징의 내면과 마찰되도록 결합된 마찰 피스톤으로 구성된 것을 특징으로 하는 드럼세탁기의 진동방지장치.Vibration preventing device of the drum washing machine, characterized in that the one end is rotatably coupled to the other of the rear or the outer body of the outer tub by a hinge structure and the other end is composed of a friction piston coupled to friction with the inner surface of the housing. 삭제delete 삭제delete 삭제delete
KR1019990045322A 1999-10-19 1999-10-19 device for insulation of vibration in drum washing machine KR100617216B1 (en)

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KR100505227B1 (en) * 2002-11-28 2005-08-03 엘지전자 주식회사 A tub over-oscillation sensing apparatus of washer

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JPS5066974A (en) * 1973-10-19 1975-06-05
JPS5066973A (en) * 1973-10-19 1975-06-05
JPH0584389A (en) * 1991-09-30 1993-04-06 Matsushita Electric Ind Co Ltd Drum type washing machine
KR19980025339U (en) * 1996-11-01 1998-08-05 김광호 Vibration Absorbers for Drum Washing Machine
KR19980066480A (en) * 1997-01-24 1998-10-15 구자홍 Damper structure of drum washing machine

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Publication number Priority date Publication date Assignee Title
JPS5066974A (en) * 1973-10-19 1975-06-05
JPS5066973A (en) * 1973-10-19 1975-06-05
JPH0584389A (en) * 1991-09-30 1993-04-06 Matsushita Electric Ind Co Ltd Drum type washing machine
KR19980025339U (en) * 1996-11-01 1998-08-05 김광호 Vibration Absorbers for Drum Washing Machine
KR19980066480A (en) * 1997-01-24 1998-10-15 구자홍 Damper structure of drum washing machine

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