BRPI1002652A2 - washing machine - Google Patents

Abstract

Washing machine. a washing machine is provided comprising an open cabinet in an upper portion, an upper cover coupled to the upper portion of the cabinet and including an opening for loading and unloading through the same laundry, a cover assembly pivotally coupled to the upper cover to open and close the opening, and a first hinge unit connecting the cover assembly to the top cover and reducing a closing speed of the cover assembly. In the washing machine, the closing speed of the cover assembly is reduced to relieve the shock between the cover assembly and the top cover.

Description

"WASHING MACHINE"

This application claims priority for Korean Patent Application No. 10-2009-0071056 filed on July 31, 2009, No. 10-2009-0109296 filed on November 12, 2009, No. 10-2009-0109294 filed on November 12, 2009. 2009 at the Korean Industrial Property Office, United States Provisional Application No. 61 / 230,590 filed July 31, 2009 with the United States Patent and Trademark Office, the contents of which are hereby incorporated in their entirety by reference.

BACKGROUND OF THE INVENTION

1. FIELD OF THE INVENTION

This invention relates to a washing machine, and more specifically, a washing machine that can control the opening / closing speed of a lid assembly to enhance convenience of use and perceived operation.

2. DISCUSSION OF RELATED TECHNIQUE

In general, a washing machine may include a washing machine that gets rid of contaminants from clothing or bedding (hereinafter referred to as "laundry") using a chemical action between water and detergent and a mechanical action, and a dryer that dries the laundry using hot air heated by a heater and a mechanical action. In addition, a washing machine may have not only a washing function but also a drying function. In addition, a washing machine may also include a renovator that sprays hot steam on the laundry to soften the creases on the laundry. A washing machine may include several devices that exert physical or chemical actions on the laundry.

The washer sequentially performs a wash cycle, a rinse cycle, and a dehydration cycle for washing the laundry. Any of the cycles can be conducted only according to user selection. The laundry can be washed by a suitable method according to the type of laundry.

A washing machine includes a body in which the laundry is washed and a door that is rotatably attached to the body. The impact of the door on the body when the door is closed may cause a problem regarding the washing machine's durability. Additionally, if the door is made of metal or includes a glass window to allow the user to view the interior of the body, the weight of the door is increased, thereby making it difficult to open the door.

SUMMARY OF THE INVENTION

Exemplary embodiments of the present invention provide a washer including a lid assembly that can be easily opened with less force and closed with less impact on an upper cover by reducing the speed of rotation.

According to one embodiment, a washing machine includes a lid assembly that can be automatically opened or closed with respect to an opening angle of 90 degrees or less.

According to one embodiment of the present invention, there is provided a washing machine comprising: a cabinet open at an upper portion, an upper cover coupled to the upper portion of the cabinet and including an opening for loading and unloading thereto laundry. to wash; a lid assembly pivotally coupled to the top cover to open and close the aperture; and a first pivot unit connecting the lid assembly with the top cover and reducing the closing speed of the lid assembly.

According to one embodiment of the present invention, there is provided a washing machine comprising: an open cabinet in an upper portion; an upper cover coupled to the upper portion of the cabinet and including an opening for loading and unloading the laundry thereon; a lid assembly pivotally coupled to the top cover to open and close the aperture; and a first pivot unit connecting the cover assembly to the top cover, and the first pivot unit controls the cover assembly to be closed without external force in a first section when the closing speed of the cover assembly lid is reduced, and to open without external force in a second section including an opening angle of 90 degrees or less.

According to one embodiment of the present invention, there is provided a washing machine comprising: an open cabinet in an upper portion; an upper cover coupled to the upper portion of the cabinet and including an opening for loading and unloading the laundry thereon; a lid assembly pivotally coupled to the top cover to open and close the aperture; and a first pivot unit connecting the lid assembly with the top cover, wherein when the lid assembly rotates to close, the first pivot unit reduces the rotation speed of the lid assembly by a first section, and increases the cap assembly rotation speed by a third section after passing through the first section.

According to one embodiment of the present invention, there is provided a washing machine comprising: an open cabinet in an upper portion; an upper cover coupled to the upper portion of the cabinet and including an opening for loading and unloading the laundry thereon; a lid assembly pivotally coupled to the top cover to open and close the aperture; and a first pivot unit connecting the cover assembly to the top cover and torqueing in one direction of opening of the cover assembly to reduce the closing speed of the cover assembly.

According to one embodiment of the present invention, there is provided a washing machine comprising: an open cabinet in an upper portion; an upper cover coupled to the upper portion of the cabinet and including an opening for loading and unloading the laundry thereon; and a door unit pivotally coupled to the top cover to open and close the opening, wherein the door unit is closed without an external force in a first section when the door unit's rotational speed is decreased, and opening without a force. outside in a second section including an opening angle of 90 degrees and below.

The above-mentioned and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated into and made part of, are illustrative embodiments of the invention and together with the description serve to explain the principles of the invention.

In the drawings:

Figure 1 is a perspective view illustrating a washing machine according to one embodiment of the present invention;

Figure 2 is a side cross-sectional view illustrating the washing machine shown in Figure 1;

Figure 3 is a perspective view illustrating part of the washing machine shown in Figure 1;

Figure 4 is a side view illustrating a part shown in Figure 3;

Figure 5 is a perspective view illustrating an upper cover, a lid assembly, a first hinge unit, and a second hinge unit;

Figure 6 is an exploded perspective view illustrating the lid assembly;

Figure 7 is a perspective view illustrating a first pivot unit shown in Figure 6;

Figure 8 is an exploded perspective view illustrating the first pivot unit shown in Figure 7;

Figure 9A is a view illustrating a structure where an axle support is connected to a lower surface of the upper cover to secure an axle connected to a second pivot unit so that the axle does not rotate;

Figure 9B is an exploded view of part A shown in Figure 9A; Figure 10 is a perspective view illustrating the shaft support shown in Figure 9A;

Figure 11 is a side view illustrating rotational movement of a lid assembly;

Figure 12 is a view illustrating a profile obtained by expanding the rotational meat of the first articulation unit;

Figure 13 is a view illustrating a relationship between the reciprocating cam and rotational cam when the cap assembly of Fig. 11 is positioned at point A;

Figure 14 is a view illustrating a relationship between the reciprocating cam and rotational cam when the cap assembly of Figure 11 is positioned between points B and position D;

Figure 15 is a view illustrating a relationship between the reciprocating motion cam and the rotational cam when the cap assembly of Figure 11 is positioned at point D;

Figure 16 is a graph illustrating the torques generated according to the rotational angles of the lid assembly; and

Figure 17 is an exploded perspective view illustrating a first pivot unit 300a 'according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when considered in conjunction with the accompanying drawings. Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The invention, however, may be incorporated in many different forms and should not be construed as limited to the embodiments herein. Rather, such embodiments are provided so that such disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, shapes and dimensions may be exaggerated for clarity, and the same reference numerals will be used throughout to designate the same or similar components.

Figure 1 is a perspective view illustrating a washing machine according to one embodiment of the present invention. Figure 2 is a side cross-sectional view illustrating the washer shown in Figure 1. Figure 3 is a perspective view illustrating part of the washer shown in Figure 1. Figure 4 is a side view illustrating a part shown in Figure 3. Figure 5 is a perspective view illustrating an upper cover, a lid assembly, a first pivot unit, and a second pivot unit. Figure 6 is an exploded perspective view illustrating the cap assembly shown in Figure 6. Figure 7 is a perspective view illustrating the first joint unit shown in Figure 6. Figure 8 is a view in exploded perspective illustrating the first joint unit shown in Figure 7.

Referring to Figures 1 to 8, the washer W includes an enclosure 10 from which an upper portion is opened, an upper cover 200 positioned on the upper portion of the enclosure 10 and includes an opening h for loading and unloading the cabinet. a door unit D which is pivotally coupled to the top cover 200 for opening and closing the opening h, and a control panel 400 which includes an interface allowing a user to control the washing machine W.

An outer tub 30 is supported by a holding element 200 in cabinet 10 to contain washing water. An inner tub 35 is rotatably positioned on the outer tub 30. A suspension 25 is provided at a lower end of the support member 20 to lessen the oscillation of the outer tub 30 which is caused by the vibration that occurs while the tub internal 35 is rotated. A pulsator 40 is rotatably positioned in a lower portion of the inner tub 35. Contaminants may be removed from the laundry by a frictional action between the pulsator 40 and the scrubbing water contained in the inner tub 35 and a generated water stream. by the rotation of the pulsator 40.

Several pores of water 36 are formed in the inner bowl 35 so that the wash water can flow between the outer bowl 30 and the inner bowl 35. A motor 50 is provided on a lower side of the outer bowl 30 to rotate the inner bowl 35 and the pulsator 40. The inner bowl 35 and / or the pulsator 40 may be rotated by the drive shaft 55 of the motor 50.

A clutch (not shown) couples the drive shaft 55 with the inner bowl 35 and / or the pulsator 40 to simultaneously rotate the inner bowl 35 and the pulsator 40 or selectively rotate one between the inner bowl 35 and the pulsator 40.

A detergent box 60 is detachably provided in the top cover 200 to contain a detergent. Top cover 200 includes a water hose 70 that is connected to an external water source (not shown), for example via a tap (not shown) to provide washing water to detergent box 60, and a valve water supply 75 which opens and closes the wash water supplied through the water supply hose 70. When the water supply valve 75 is opened, the wash water from an external water source is induced to flow in detergent box 60 and mixed with the detergent contained in detergent box 60, and then the mixed water is supplied to the inner bowl 35.

A drain hose 80 for discharging wash water from the external tub 30 to the outside, a drain valve 85 for opening and closing the wash water discharged through the drain hose 80, and a drain pump 86 for pumping out wash water are provided at a lower end of the outer tub 30.

Door unit D includes a lid assembly 100 and a first hinge unit 300a. Cover assembly 100 is pivotally coupled to top cover 200 to allow a user to open and close opening h. The first hinge unit 300a connects the lid assembly 100 with the upper lid 200. A front end of the lid assembly 100 may protrude forwardly than the upper lid 200 while the lid assembly 100 is left closed. to facilitate opening the lid assembly 100.

Lid assembly 100 includes an upper lid frame 110, an inner lid portion 120, a transparent element 130, a lower lid frame 140, and decorative panel 150.

The upper lid frame 110 forms the appearance of an upper portion of the lid assembly 100, and the lower lid frame 140 forms the appearance of a lower portion of the lid assembly 100. The inner lid portion 120 is provided between the upper lid frame 110 and the lower lid frame 140 to increase the stiffness of the lid assembly 100, thereby preventing the lid assembly 100 from being deformed, and to install the transparent element 130.

Upper upper lid frame 110 and lower lid frame 140 are opened in a central portion thereof so that the laundry can be viewed from the outside. The inner lid part 120 is formed along a periphery of the lid assembly 100 to surround and secure the transparent member 130.

The inner lid portion may be formed as a unitary body. In addition, various inner lid parts may be provided. According to one embodiment, for example, four lid inner portions 120 may be provided as shown in Figure 6, wherein each of the lid inner portions 120 is positioned near a corner of the lid assembly 100 to secure the lid. corner of the lid assembly 100.

Lid inner portions 120 are positioned between upper lid frame 110 and lower lid frame 140 and surround transparent member 130. Accordingly, lid internal parts 120 are arranged between transparent member 130 and lid upper frame. 110. The inner lid parts 120 may have a suitable tolerance corresponding to the shape of the transparent element 130 so that the transparent element 130 can be fixed without oscillation.

For example, the inner lid portions 120 may be formed of a molded plastic body to have slight elasticity. The transparent member 130 surrounded by the inner lid portions 120 is fitted snugly to the upper lid frame 110 due to an externally exerted force thereby securing the transparent member 130 without oscillation. As a consequence, the lid assembly 100 may be increased.

The transparent element 130 is a window which is formed of a transparent material to allow the user to view the laundry in the inner bowl 35 of the washing machine W through the transparent element 130. According to one embodiment, the transparent element 130 may be formed of clear plastic or reinforced glass which provides sufficient resistance against external force or scratches.

An upper end of the decorative panel 150 is coupled to a front end of the upper lid frame 110, and a lower end of the decorative panel 150 is coupled to the lower lid frame 140, thereby defining a handle that can be held by a user to secure it. the lid assembly 100. The decorative panel 150 may reinforce the coupling of the upper lid frame 110 and the lower lid frame 140. In addition, the decorative panel 150 prevents a coupled portion of the upper lid frame 110 and from the lower lid frame 140 is viewed from the outside, thereby improving the aesthetic sense of the lid assembly 100.

The first hinge unit 300a couples the lid assembly 100 with the upper lid 200 and reduces the closing speed of the lid assembly 100 by a predetermined section where the lid assembly 100 is closed.

The first hinge unit 300a includes an elastic member 330a and a cam unit that resiliently deforms the elastic member 300a while the cap assembly 100 rotates and converts the restoring force exerted from the deformed elastic member 330a to one. rotational force.

The elastic member 330a may be formed of several types of members that are formed while the lid assembly 100 rotates to generate an elastic force or restorative force. The elastic member 330a may be suitably selected depending on the characteristics, such as an installed location or structure. According to one embodiment, the elastic member may be a spring 330a which is compressed while the cap assembly 100 rotates.

The first hinge unit 300a may be provided on the lid assembly 100 or the top cover 200. For example, when the top cover 200 cannot provide sufficient space for the first hinge unit 300a due to opening h, the first hinge unit 300a may be provided on lid assembly 100.

The first hinge unit 300a may be connected to lid assembly 100 by various structures. For example, according to one embodiment, the first hinge unit 300a may be mounted on the inner lid portion 120.

The door unit D may further include a second hinge unit 300B. One end of cap assembly 100 is coupled to top cover 200 via first hinge unit 300a, and the other end of cap assembly 100 is coupled to top cover 200 via second hinge unit 300B.

The first hinge unit 300a generates torque in an opening direction of the lid assembly 100 in a predetermined section where the lid assembly 100 rotates. Such torque allows the closing speed of the lid assembly 100 to be reduced while the lid assembly 100 is closed at the predetermined section, and allows the lid assembly 100 to be easily opened with less force while the lid assembly 100 is closed. open in the default section.

The second pivot unit 300b serves to reduce the rotation speed of the cap assembly 100 in various ways, such as, for example, by using an oil pressure or a coil spring restoration feature. In this embodiment, the second articulation unit employs a method of using an oil pressure. However, the present invention is not limited thereto. For example, several known types of articulation units may be employed to reduce the speed of rotation.

In the present embodiment, the second hinge unit 300b is fluid-filled and includes a pivoting wing (not shown) submerged under the fluid and rotates in operative association with the lid assembly 100. When the lid assembly 100 rotates Repulsion, such as resistance or pressure, is exerted against the wing of rotation by the fluid, thereby reducing the rotation speed of the lid assembly 100.

When the lid assembly 100 is not only rotated and closed but also rotated and opened, the resistance of the second pivot unit 300b causes a predetermined torque to be generated against rotation of the lid assembly 100.

In terms of stable rotation of the lid assembly 100, the second joint unit 300b operates as a hydraulic damper to prevent the sensation of operation while the lid assembly 100 rotates.

According to one embodiment, the first pivot unit 300a and the second pivot unit 300b may be in alignment with the axis of rotation of the lid assembly 100.

The cam unit included in the first pivot unit 300a converts the rotational movement of the lid assembly 100 to linear motion allowing the elastic member 330a to be elastically deformed.

Referring to Figures 7 and 8, the first pivot unit 300a includes a first pivot housing 300a which is inserted into the lid inner portion 120 and includes a cam unit therein and a first pivot unit housing cover 309 which is connected to the housing of the first pivot unit 310a via a coupling member, such as a bolt or pin 399.

Connecting arms 314a and 392a are extended from the housing of the first pivoting unit 310a and the housing cover of the first pivoting unit 390, respectively. The connecting arms 314a and 392a are coupled together and then connected to the upper lid frame 110 by means of a coupling member, such as a screw.

The housing of the first pivot unit 310a includes a projecting and recessed surface 316a coupled to the housing cover of the first pivot unit 390 and protrusions 311a, 312a, and 313a that prevent the first pivot unit 300a from being idle in the housing. lid inner portion 120. lid inner portion 120 includes slots into which protrusions 311a, 312a, and 313a are inserted. The first hinge unit 300a is prevented from running in a vacuum on the inner lid portion 120 by inserting the protrusions 311a, 312a, and 313a into the slots.

Coupling members, such as bolts or pins, are connected through the upper lid frame 110 to the coupling holes 315a and 393a provided in the connecting arms 314a and 392a with the first hinge unit 300a inserted into the inner lid part 120 of so that the lid assembly 10 can be rotated in operative association with the first pivot unit 300a.

The cam unit of the first articulation unit 300a includes a rotary cam 380a operatively associated with the lid assembly 100 and an alternate moving cam 360a which is engaged with the rotational cam 380a for alternate movement along an axis 350a. The shaft 350a is connected to a shaft holder 240 provided on the upper cover 200.

Shaft holder 240 restricts the rotation of shaft 350a. For this purpose, shaft 350a includes a bevel 350a along a longitudinal direction, and shaft holder 240 includes an axle holder hole 243 which has a cross-sectional shape corresponding to a cross-sectional shape of the shaft. 350a which has chamfer 351a.

The shape of the reciprocating cam 360a corresponds to the shape of the rotary cam 380a. The reciprocating cam 360a and the rotational cam 380a are formed to be inclined along a circumferential direction so that the height of a portion where the reciprocating cam 360a and the rotational cam 380a contact each other, is changed. In a structure where reciprocating motion cam 360 and rotational cam 380a are mutually engaged, a rotational cam surface 380a which abuts against reciprocating motion cam 360a converts the rotational motion of rotational cam 380a into linear motion to allow reciprocating movement of reciprocating cam 360a. Such a surface is then defined as a "conversion surface m". A profile of a slope of the conversion surface m as viewed from a side surface is defined as a "conversion line s".

Additionally, a reciprocating cam surface 360a abutting against the conversion surface m of rotational cam 380a allows reciprocating cam 360a to perform reciprocating movement along axis 350a to exert a force against the reciprocating surface. conversion m. Such a surface is defined as an "acting surface".

Although it has been described in this embodiment that the rotational cam 380a and reciprocating cam 360a have the same shape, that is, the conversion surface profile of the rotary cam 380a is identical to the reciprocating cam of the reciprocating cam 360a, the present invention is not limited to it. For example, the shape of the conversion surface and the acting surface does not matter as long as the conversion surface is formed on the rotational cam 380a and, corresponding to the conversion surface profile, the acting surface is formed on the moving cam. reciprocating cam 360a such that reciprocating cam 360a can move alternately at a certain distance as the rotational cam 380a is rotated.

Similarly, the acting surface may be formed on the alternating motion cam 360a and, corresponding to the acting surface profile, the conversion surface may be formed on the rotational cam 380a to convert a force exerted from the acting surface of the motion cam 360a so that the rotary cam 380a can rotate.

One embodiment will now be described where the conversion surface m of the rotational cam 380a and the acting surface of the reciprocating cam 360a are formed identical to one another. The description will focus primarily on the conversion surface m and the conversion line s formed on the rotational cam 380a.

As the cap assembly 100 rotates, the conversion surface m of the rotary cam 380a slides rotatably along the actuating surface of the reciprocating cam 360a and is subjected to a force exerted from the actuating surface of the reciprocating cam 360a . The direction of force is changed by the slope of the conversion surface m to generate torque.

The movement distance of reciprocating motion cam 360a varies with the rotational angle of the rotational cam 380a. The inclination of the conversion surface m may be adjusted, for example, from the movement distance of the reciprocating motion cam 360a. Since the movement distance of the alternating motion cam 360a is equal to the compressed extension of spring 330a, it can be said that the inclination of the converting surface m is closely associated with a torque exerted by the first articulation unit 300a. .

In this embodiment, the meat unit includes shaft 350a, rotational meat 380a, and reciprocating meat 360a. The reciprocating cam 360a begins to move alternately along the axis 350a by a repulsive force exerted from the rotational cam 380a as the cap assembly 100 rotates. In this situation, as described above, the elastic member 330a connected to the axis 350a is elastically deformed. Additionally, a restoring force of the deformed elastic member 330a is converted to a rotational force by the cam unit, thereby generating a torque.

Accordingly, as the cap assembly 100 is rotated, the cam unit converts the rotational motion of the rotary cam 380a into linear motion of the reciprocating cam 360a and vice versa by interaction between the rotational cam 380a and the cam of reciprocating motion 360a.

The first hinge unit 300a may further include a washer 320a inserted between the spring 330a and the housing of the first hinge unit 310a, a bushing 340a connected to the shaft 350a, and a bushing 370a inserted into the housing cover of the first hinge unit. pivot 390 to support shaft 350a.

When rotational cam 380a rotates, reciprocating cam 360a alternately moves linearly while inserted into shaft 350a, and spring 330a is extended or compressed by reciprocating cam 360a. The shaft 350a includes a stepped portion 352a that restricts the movement distance of the reciprocating motion cam 360a.

Figure 9A is a view illustrating a structure where an axle support is attached to a lower surface of the upper cover to secure an axle connected to a second pivot unit so that the axle does not rotate. Figure 9B is an enlarged view of part A shown in Figure 9A. Figure 10 is a perspective view illustrating the shaft support shown in Figure 9A.

Referring to Figures 9A, 9B, and 10, an axle support 240 is fixed to a lower surface of the upper cover 200 to support the axle 350b connected to the second pivot unit 300b. To support the shaft 350a of the first pivot unit 300a, the shaft support 240 may also be provided on one side where the first pivot unit 300a is installed.

Although the shaft support 240 for supporting the shaft 350b connected to the second pivot unit 300b is shown in Figures 9A, 9B and 10, the same structure can also be employed to support the shaft 350a of the first pivot unit 300a. . One embodiment will now be described where the axle support 240 holds the axle 350a of the first pivot unit 300a. The shaft support 240 holds the shaft 350a of the first pivot unit 300a at least two points. For example, the shaft support 240 includes a first support 241 and a second support 242 which are separated from each other to support the axis 350a at two points.

First support 241 and second support 242 include an axle support hole 243 supporting shaft 350a. The shaft support hole 243 of the first support 241 may have the same shape as that shaft support hole 243 of the second support 242.

As such, shaft 350a is supported by shaft support 240 at two points. Accordingly, even when a force is exerted on the shaft 350a when the cap assembly 100 rotates, the shaft 350a is aligned on a predetermined geometry axis by the two shaft support holes 243. Thus, the shaft 350a can be sustainably supported. stable without oscillation, thereby enhancing the operating perception of the lid assembly 100.

Shaft 350a includes a bevel 351a formed by substantially flat cutting of shaft 350a along an axial direction to prevent shaft 350a from rotating while inserted into shaft support hole 243. Shaft support hole 243 is shaped corresponding to the axis shape 350a. However, the present invention is not limited thereto. Any structures may be employed by those skilled in the art to prevent rotation of shaft 350a.

The bushing 246 is inserted into the shaft support 240. The bushing 246 is a shock absorbing member that is inserted between the shaft 350a and the shaft support 240. The bushing 246 is formed of a slightly elastic material such as , for example plastic, to prevent shaft 350a and shaft holder 240 from fraying due to friction between shaft 350a and shaft holder 240. Shaft holder 240 includes a connection hole 245 to which bushing 246 is connected.

Figure 11 is a side view illustrating rotational movement of a lid assembly. Figure 2 is a view illustrating a profile obtained by rotational cam expansion of the first articulation unit. Figure 13 is a view illustrating a relationship between the reciprocating motion cam and the rotational cam when the cap assembly of Figure 11 is positioned at point A. Figure 14 is a view illustrating a relationship between the reciprocating motion cam and the rotary cam. rotational cam when the lid assembly of Figure 11 is positioned between the Bea points D position. Figure 15 is a view illustrating a relationship between the reciprocating motion cam and the rotational cam when the lid assembly of Figure 11 is positioned at point D.

A process of opening lid assembly 100 will now be described.

Referring to Figure 11, the first pivot unit 300a generates torque in an opening direction of cap assembly 100 while cap assembly 100 rotates between positions B and D so that a user can open cap assembly 100. with less force. The rotational cam 380a of the first hinge unit 300a has a profile as shown in Figure 12.

When the point P of the reciprocating motion cam 360a (see Figures 13 to 15) is positioned in a section between points Pb and Pd, the reciprocating motion cam 360a exerts a force on the rotational cam 380a in an axial direction. due to a compressive spring restoring force 330a, and the exerted force is converted to a rotational force by the sloping conversion surface m in the rotational cam 380a. Consequently, a torque is generated in an opening direction of the lid assembly 100, so that a user can open the lid assembly 100 with less force.

The resulting torque T exerted for cap assembly 100 is the sum of a torque Tg generated by the weight of cap assembly 100, a torque Ts generated by the first pivot unit 300a, and a torque Td generated by the second pivot unit 300b . When cap assembly 100 is positioned in a first section between points B and C, torque Ts is exerted in the opening direction of cap assembly 100, but the resulting torque T is still exerted in the closing direction of cap assembly. 100. That is, T = Tg-Ts-Td> 0. "T> 0" means that torque is exerted in the closing direction of cap assembly 100, and "T <0" means that torque is exerted in the opening direction of cap assembly 100. Here, "Tg", " Ts ", and" Td "represent the magnitude of the torques," + "represent that a torque is exerted in the closing direction of the cap assembly 100, and" - "represents a torque that is exerted in the opening direction of the cap assembly 100

When lid assembly 100 is positioned in a second section between CeD points, T = Tg-Ts-Td <0. Thus, the lid assembly 100 can be opened without external force.

Specifically, as T> 0 in the first section between points B and C, an additional force is required by a user to open cap assembly 100. T <0 as long as point C is passed. Accordingly, in the second section between points C and D, cap assembly 100 can automatically rotate to point D without additional force from the user. That is, in the first section with respect to point C1 the lid assembly 100 is automatically closed and thus additional force is required to open the lid assembly 100. In this case, however, the lid assembly 100 can be open with less force thanks to the torque Ts exerted in the opening direction of the lid assembly 100. Ε the lid assembly 100 can be automatically closed without additional force in the second section between points C and D.

A process of closing lid assembly 100 will now be described.

The lid assembly 100 is left open at point D. Then a user exerts a force on the lid assembly 100 so that the lid assembly 100 is positioned at point C. Once position C is transposed T> 0, and thus cap assembly 100 automatically rotates without additional force in the closing direction of cap assembly 100. In the first section between points C and B, torques Ts and Td are exerted by the first pivot unit 300a and by the second pivot unit 300b in the opening direction of the lid assembly 100. Therefore, the rotation speed of the lid assembly 100 is reduced to prevent the lid assembly 100 from excessively reaching the upper cover 200.

As cap assembly 100 passes through point B, that is, while cap assembly 100 is positioned in the third section between points B and A, point P is positioned in section S1 which is inclined in the opposite direction from of section S2, and thereby torque Ts is exerted in the direction of closure of lid assembly 100, thereby closing lid assembly 100 more securely (T> 0).

In summary, when the lid assembly 100 is closed, in the first section C and B, the rotation speed of the lid assembly 100 is reduced by the torques Ts and Td which are exerted in the opening direction of the lid assembly 100. In the third between B and A, the torque Ts is exerted in the closing direction of the cap assembly 100 due to the inclination of the section S1 and thereby the closing speed is increased. Accordingly, the lid assembly 100 can be securely closed. In this case, as the opening angle at point B where the direction of actuation of the torque Ts exerted for the lid assembly 100 is changed (hereinafter, the "opening angle" is referred to as an angle measured in the direction opening angle of the lid assembly 100. The opening angle is assumed to be "0" degrees when the lid assembly 100 is closed), is an angle through which the rotation speed of the lid assembly 100 begins to accelerate, the opening angle will now be defined as an "accelerated closing reference angle". Although the accelerated closing reference angle is set to 10 degrees, the present invention is not limited to this.

In the washing machine W according to one embodiment of the present invention, the lid assembly 100 is automatically opened or closed with respect to point C. Then an opening angle when the lid assembly 100 is positioned at point C is referred to. as a "self-closing reference angle" in terms of a lid assembly opening process 100 and as a "self-closing reference angle" in terms of a lid assembly 100 closing process.

Although the auto open / close reference angle is 80 degrees as shown in Figure 11, the present invention is not limited thereto. For example, the automatic opening / closing reference angle may include several angles, such as an opening angle of no more than 90 degrees.

The accelerated closing reference angle and / or the automatic opening / closing reference angle can be adequately set considering convenience of use and durability. For example, the weight of the lid assembly 100, and / or the torque capacity of the first articulation unit 300a and the second articulation unit 300b may be additionally considered. Here "torque capacity" is defined as a range of torques that can be generated by the first pivot unit 300a or the second pivot unit 300b, that is, a range between maximum torque and minimum torque.

Torques generated by the first pivot unit 300a may vary within a predetermined range depending on a compressed extent of the elastic member that changes as the cap assembly 100 rotates. The second pivot unit 300b may vary within a range. predetermined depending on the compressive capacity of the fluid that changes as the cap assembly 100 rotates.

Several relationships may exist between the torque capacity of the first pivot unit 300a and the torque capacity of the second pivot unit 300b.

When a ratio of the torque capacity of the first articulation unit 300a to the torque capacity of the second articulation unit 300b is 8: 2, Ts becomes relatively larger than Td. Accordingly, the second section in which the lid assembly 100 is automatically opened may have a wide range.

For example, when the ratio is 8: 2, the lid assembly 100 may be automatically opened once the opening angle of the lid assembly 100 reaches 80 degrees.

When a ratio of the torque capacity of the first articulation unit 300a to the torque capacity of the second articulation unit 300b is 7: 3, a difference between Ts and Td is relatively small compared to when the ratio is 8: 2. . Consequently, the second section is narrowed, and the first section is enlarged. For example, lid assembly 100 is automatically opened when the opening angle is 85 degrees or greater and automatically closed when the opening angle is 85 degrees or less.

Similarly, when a ratio of the torque capacity of the first articulation unit 300a to the torque capacity of the second articulation unit 300b is 6: 4, the second section is narrower and the first section is larger than when the ratio is 7: 3. For example, the lid assembly 100 is automatically opened when the opening angle is 90 degrees or more and automatically closed when the opening angle is 90 degrees or less.

The first and second section ranges depending on torque capacity have been described assuming that the weight of the cap assembly 100 is constant. However, as the weight of the cap assembly 100 varies the torque Tg generated by the weight of the cap assembly. Lid cap 100 is changed. Consequently, the first section and the second section also vary. As a result, when the ratio is 7: 3 or 6: 4, lid assembly 100 can operate similarly to when the ratio is 8: 2 by changing the weight of lid assembly 100.

The first pivot unit 300a and the second pivot unit 300b may be designed such that a range of the torque capacity of the first pivot unit 300a and the torque capacity of the second pivot unit 300b have an appropriate value depending on the weight of the lid assembly 100. In so doing, the lid assembly 100 may be automatically opened or closed in the pre-established first and second sections.

For example, under a condition where lid assembly 100 is automatically closed when the opening angle varies from 0 to 80 degrees and automatically opened when the opening angle varies from 80 to 110 degrees, when the weight of cap assembly 100 is W1, a ratio of the torque capacity of the first pivot unit 300a to the torque capacity of the second pivot unit 300b can be projected to be 6: 4. If the weight of cover assembly 100 is changed from W1 to W2 greater than W1, the torque generated by the weight of cover assembly 100 increases. Consequently, the torque capacity of the first pivot unit 300a must be increased to automatically open cover assembly 100 in the second preset section. In this case, a ratio of the torque capacity of the first articulation unit 300a to the torque capacity of the second articulation unit 300b may be 7: 3 or 8: 2.

Briefly, the range of the first and second section can be determined depending on the torque capacity of the first pivot unit 300a and the second pivot unit 300b and / or the weight of the cap assembly 100. Ε the cap assembly 100 can be adapted to be automatically opened / closed in the first and second predefined section by designing the first pivot unit 300a and the second pivot unit 300b such that a ratio of the torque capacity of the first pivot unit 300a to torque capacity of the second hinge unit 300b is of a suitable value depending on the weight of the cover assembly 100.

The first hinge unit 300a may be adapted for the lid assembly 100 to be automatically closed when the opening angle is not greater than 60 degrees to enhance convenience of use. For example, the first section may have an opening angle of 60 to 80 degrees.

Additionally, the second section may have an opening angle of 80 to 90 degrees so that the lid assembly 100 may be automatically opened even when the opening angle is no less than 90 degrees. The automatic opening / closing reference angle described above in connection with Figure 11 is an angle of the lid assembly 100 when the lid assembly 100 is positioned at point C. For example, an opening reference angle / Automatic closing can be substantially 80 degrees. This corresponds to a situation where P is positioned at Pc in Figure 12.

The torque Ts generated by the first pivot unit 300a and the torque Td generated by the second pivot unit 300b may be selected as a suitable value by considering the torque Tg generated by the weight of cap assembly 100. For example, Ts may be relatively higher than that Td. Additionally, a suitable relationship may be present between Ts and Td so that the lid assembly 100 may be automatically opened in the second section between CeD. For example, according to one embodiment, the ratio of Ts: Td may be substantially 8: 2.

In the profile shown in Figure 12, rotation of lid assembly 100 is accelerated in section S1 to more securely close lid assembly 100. Next, section S1 is referred to as an "accelerated closing control section". The slope of section S1 is referred to as an "accelerated close control slope". The rotation speed of lid assembly 100 when lid assembly 100 is generated and closed is reduced in section S2. Next, section S2 is referred to as a "closing speed reduction control section". The slope of section S2 is referred to as a "closing speed reduction control slope". In section S3, lid assembly 100 is automatically opened without additional force when lid assembly 100 is rotated and opened. Next, section S3 is referred to as an "automatic opening section". The slope of section S3 is referred to as an "automatic opening control slope".

In this embodiment, the conversion line S of rotational meat 380a has been described as a straight line. However, the present invention is not limited to that. Conversion line S can be a curved line. Additionally, the conversion surface m may be formed to have various inclinations in section S2 so that the degree of closure speed reduction of the lid assembly 100 is varied, or the conversion surface m may be formed to have varying inclinations in section S3 so that the opening speed of lid assembly 100 is varied within an automatic opening section of lid assembly 100.

Additionally, except for section S1, rotational cam 380a may be provided. In that case, when the lid assembly 100 has an angle equal to or less than the automated opening reference angle, the lid assembly 100 may be controlled so that the closing speed is reduced until the lid assembly 100 is completely closed. However, in any case, the lid assembly 100 can be automatically opened or closed without the user's force with respect to the auto-referencing / closing angle. Additionally, the lid assembly 100 may be controlled such that the closing speed is reduced within a certain subsection of the closing assembly or the entire section.

Figure 16 is a graph illustrating the torques generated according to the rotational angles of the cap assembly. Tg and Ts are shown only in Figure 16 without considering an effect via the second pivot unit 300b. However, although the torque Td generated by the second pivot unit 300b is considered, the graph format is substantially similar to that shown in Figure 16.

Referring to Figures 11 and 16, when the lid assembly 100 is gradually opened and consequently the opening angle is increased, the torque Tg generated by the weight of the lid assembly 100 and the torque Ts generated by the first pivot unit 300a For the section where the opening angle varies from approximately 50 degrees to 90 degrees, Tg is exerted in the closing direction of the lid assembly 100, Ts is exerted in the opening direction of the lid assembly 100. cover 100. At the point where the opening angle is 90 degrees, Tg-Ts is -7.1 kgfcm.

According to one embodiment provided that the lid assembly 100 rotates in the closing direction of the lid assembly 100 at an angle equal to or less than approximately 80 degrees and rotates in the opening direction of the lid assembly 100 at an angle. equal to or greater than approximately 80 degrees, a resulting torque exerted in the closing direction at an angle equal to or less than 80 degrees is minimized, and a resulting torque exerted in the opening direction at an angle equal to or greater than 80 degrees is The closing speed of the lid assembly 100 is reduced when the lid assembly 100 is rotated and closed and the opening speed of the lid assembly 100 is increased when the lid assembly 100 is rotated and opened. .

For this purpose, the second pivot unit 300b may be provided on one side of the lid assembly 100, wherein the second pivot unit 300b may have a suitable torque capacity to satisfy the above condition. As an example, only when Td is exerted in the opening direction of lid assembly 100 at an opening angle of 80 degrees, or exerted in the closing direction of lid assembly 100 with a value of less than 7.1 kgfcm, the total torque T exerted for cap assembly 100 becomes negative, so cap assembly 100 can be automatically opened at an angle of 80 degrees or more.

Accordingly, the second hinge unit 300b according to one embodiment may have to generate sufficient torque to satisfy the condition that it may automatically open or close the lid assembly 100 with respect to a predetermined angle (the reference angle of automatic opening / closing mentioned above, eg 80 degrees in this mode).

Figure 17 is an exploded perspective view illustrating a first pivot unit 300a 'according to another embodiment of the present invention. The description of the same or similar constructions as the first articulation unit 300a described in connection with Figures 1-16 will not be repeated.

Referring to Figure 17, a first hinge unit 300a 'includes a cover unit having a different structure than that of the first hinge unit 300a. The cover unit includes a clamping cam 380a 'so that its rotation is restricted by an axis 350a', a conversion cam 360a 'which is engaged with clamping cam 380a' to convert rotational movement into linear motion. and a spring that is compressed or extended by reciprocating movement of the conversion cam 360a '. According to one embodiment, two springs 3231a 'and 330a' may be provided to generate a sufficient tensile force. Conversion cam 360a 'includes a plurality of locking protuberances 361a' along an outer circumferential surface and is inserted into a sliding groove 317a 'provided along an inner circumferential surface of a first pivot unit housing. 310a '. When the conversion cam 360a 'rotates in conjunction with the first hinge unit 300a', the conversion cam 360a 'is guided to move alternately along the sliding groove 317a'. Springs 331a 'and 330a' are inserted between conversion cam 360a 'and housing of first pivot unit 310a'.

The shaft 350a 'includes a chamfer 351a' so that its rotation is limited when coupled with the shaft support 240. The clamping cam 380a 'includes a projecting and recessed polygonal portion 382a' in a portion that is coupled. to a connecting end 352a 'of shaft 350a'. A coupling part (not shown) is provided at the connecting end 352a 'of shaft 350a' to have a shape corresponding to a shape of the projecting and recessed part 382a 'so that the clamping cam 380a' is not rotated.

Elements 310a ', 311a', 312a ', 313a', 314a ', 315a', 316a ', 390a', 392a ', 393a', and 399a 'have substantially the same constructions as those of elements 310a, 311a, 312a, 313a. , 314a, 315a, 316a, 390a, 392a, 393a, and 399a, respectively, and thus the description will not be repeated.

The operation of the articulating unit 300a 'will now be described.

When cap assembly 100 rotates, conversion cam 360a 'rotates accordingly. Ε, the 360a 'conversion cam rotates accordingly. Ε, conversion cam 360a1 also shifts alternately due to the shape of ends 381a 'and 362a' of clamping cam 380a 'and conversion cam 360a'.

When the cap assembly 100 is rotated and closed, the conversion cam 360a 'gradually slides into the housing of the first pivot unit 310a' to compress the springs 330a 'and 331a'. In contrast, when the cap assembly is rotated and opened, the conversion cam 360a 'gradually slides out of housing 310a' to restore compression springs 330a 'and 331a'.

In the above embodiment, a torque is exerted to the lid assembly 100 through the meat unit including the rotational meat 380a rotating together with the lid assembly 100, the reciprocating cam 360a which is connected to the shaft. 350a in a manner restricting rotation and shifting alternately as rotational cam 380a rotates, and spring 330a which is compressed and extended by reciprocating cam 360a. In contrast, in this embodiment, torque is exerted to the lid assembly 100 via the meat unit including the locking cam 380a 'which is restricted in rotation, the conversion cam 360a' which rotates together with the cam assembly. cap 100 and moves alternately by a force exerted by the clamping cam 380a ', and the springs 330a' and 331a 'which are compressed and extracted by the conversion cam 360a'.

Particularly in this embodiment, two springs, such as the first and second spring 330a ', and 331a', are employed unlike the previous embodiment, wherein the first and second spring 330a 'and 331a' are different in length. and diameter of each other. Second spring 331a 'has a shorter diameter and length than those of first spring 330a' to be inserted into first spring 330a '. In a dual spring frame, only the first spring 330a 'is compressed and the closing speed of the cap assembly 100 is reduced by one section while the cap assembly 100 is closed, and then after the section is closed. transposed, the second spring 331a 'is compressed together with the first spring 330a' to further reduce the closing speed of cap assembly 100.

The torque generated by the weight of the lid assembly 100 is gradually increased as the lid assembly 100 is closed and thus the closing speed can be suddenly increased. To reduce such a sudden increase in closing speed, the second spring 331a 'is additionally provided on the first spring 330a'. Specifically, when the first spring 330a 'is gradually compressed to reach an end of the second spring 331a' (for example when the opening angle is 20 degrees), the first and second spring 330a 'and 331a' are compressed together. effectively reduce the closing speed of the lid assembly 100.

The operation of the lid assembly 100 after the first hinge unit 300a 'is connected to the lid assembly 100 is substantially identical or similar to that described in the previous embodiment and thus the description will not be repeated.

The present invention may be employed in any washing machine including a tumble dryer, a dryer, and a washer with a dryer, and thus the present invention is not limited to the washing machine described with reference to the drawings and descriptive report. .

In the washing machine according to one embodiment of the present invention, the closing speed of the lid assembly may be reduced thereby relieving the shock between the lid assembly and the upper cover.

Additionally, in the washing machine according to one embodiment of the present invention, the lid assembly can be easily opened with less external force.

Additionally, in the washing machine according to one embodiment of the present invention, the lid assembly may be locked more securely.

Additionally, in the washing machine according to one embodiment of the present invention, the lid assembly may be automatically closed at a predetermined or smaller angle, thereby enhancing the convenience of use.

Additionally, in the washing machine according to one embodiment of the present invention, the lid assembly may be automatically opened at a predetermined or greater angle, thereby enhancing the convenience of use.

Additionally, in the washing machine according to one embodiment of the present invention, the lid assembly may be designed so that the auto-opening reference angle and the auto-closing reference angle can be predicted, thereby improving. the predictability of the operation.

Additionally, in the washing machine according to one embodiment of the present invention, the operating perception of the lid assembly may be improved.

Additionally, in the washing machine according to one embodiment of the present invention, durability and convenience of use may be improved even when the lid assembly is weighed.

While preferred embodiments of the invention have been described for illustration purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible without departing from the spirit and scope of the invention as disclosed in the appended claims.

Claims (37)

1. Washing machine, characterized by understanding: an open cabinet in an upper portion; an upper cover coupled to the upper portion of the cabinet and including an opening for loading and unloading laundry thereon; a lid assembly rotatably coupled to the top cover to open and close the aperture; and a first pivot unit connecting the lid assembly with the upper cover and reducing the closing speed of the lid assembly. Washing machine according to claim 1, characterized in that the first articulation unit includes: an elastic member; and a cam unit deforming the elastic member as the cap assembly rotates and converting a restoring force exerted from the deformed elastic member to a rotational force. Washing machine according to claim 2, characterized in that the cam unit includes: an axle connected to the upper cover; a rotational cam rotating in operative association with the lid assembly; and an alternative motion cam connected to the shaft so that its rotation is limited, and deforming the elastic member when moved by the rotational cam along the shaft. Washing machine according to claim 3, characterized in that the rotational cam includes a conversion surface formed to be inclined with respect to a surface that abuts against the reciprocating motion cam. such that a movement distance of the reciprocating motion cam is determined according to a rotational angle of the rotational cam. Washing machine according to claim 4, characterized in that the converting surface is formed to exert a force in one direction of pressing the reciprocating cam when the lid assembly rotates to close. Washing machine according to claim 4, characterized in that the reciprocating motion cam includes an actuating surface which is formed to correspond with the conversion surface such that the conversion surface is rotated about sliding shape. Washing machine according to claim 3, characterized in that the reciprocating motion cam is moved in a compressive direction of the elastic member as the lid assembly rotates to close. Washing machine according to claim 1, characterized in that it further comprises: a second hinge unit coupling the lid assembly with the upper cover, wherein the second hinge unit includes a fluid which is compressed when the cap assembly rotates such that a rotation speed of the cap assembly is reduced by a repulsive action of the compressed fluid. Washing machine according to claim 8, characterized in that the first hinge unit and the second hinge unit are provided on both sides of the lid assembly, respectively, so that the rotational axes of the first and second hinge units are in alignment with a rotational shaft of the lid assembly. 10. Washing machine, characterized in that it comprises: an open cabinet in an upper portion; an upper cover coupled to the upper portion of the cabinet and including an opening for loading and unloading laundry thereon; a lid assembly pivotally coupled to the top cover for opening and closing the opening; and a first pivot unit connecting the cover assembly to the top cover, wherein the first pivot unit controls the cover assembly to be closed without external force in a first section when a set closing speed of lid is reduced, and to be opened without external force in a second section including an opening angle of 90 degrees or less. Washing machine according to claim 10, characterized in that: the first articulation unit includes: an elastic member; and a cam unit deforming the elastic member as the cap assembly rotates and converting the restoring force exerted from the deformed elastic member to a rotational force. Washing machine according to claim 11, characterized in that: the meat unit includes: an axle connected to the upper cover; a rotational cam rotating together with the lid assembly; and an alternative moving cam connected to the shaft such that its rotation is limited and deforming the elastic member when displaced along the shaft by the rotational cam. Washing machine according to claim 12, characterized in that the rotational meat includes a conversion surface formed to be inclined with respect to a surface that abuts against the reciprocally moving meat. such that a movement distance of the reciprocating cam is determined according to a rotational angle of the rotational cam, and wherein the conversion surface is formed to be inclined such that a torque is generated in a closing direction of the cam. cap assembly in the first section and a torque is generated in a second opening direction of the cap assembly in the second section. Washing machine according to claim 10, characterized in that it further comprises: a second pivoting unit which reduces a rotation speed of the lid assembly. Washing machine according to claim 14, characterized in that: a torque capacity of the first hinge unit, a torque capacity of the second hinge unit, and a weight of the lid assembly are determined. so that the lid assembly is closed without external force in the first section and opened without external force in the second section. Washing machine according to claim 15, characterized in that: in the first section, a resulting torque according to a torque generated by the first articulation unit, a torque generated by the second articulation unit, and a torque generated by the weight of the cap assembly, and act on the cap assembly in one direction to close, and in the second section, the resulting torque acts on the cap assembly in an opening direction. Washing machine according to claim 15, characterized in that a ratio of the torque capacity generated by the first articulation unit to the torque capacity generated by the second articulation unit is 8: 2. Washing machine according to claim 15, characterized in that: a ratio of the torque capacity generated by the first articulation unit to the torque capacity generated by the second articulation unit is 7: 3. Washing machine according to claim 15, characterized in that: a ratio of the torque capacity generated by the first articulation unit to the torque capacity generated by the second articulation unit is 6: 4. Washing machine according to claim 10, characterized in that: the first section includes an opening angle ranging from 60 to 80 degrees. Washing machine according to claim 10, characterized in that: the second section includes an open angle not exceeding 90 degrees. Washing machine according to claim 21, characterized in that: the second section includes an opening angle ranging from 80 to 90 degrees. Washing machine according to claim 10, characterized in that: the first pivot unit controls the lid assembly so that when the lid assembly rotates for closing, a rotation speed of the assembly The lid length is increased by a third section after the first section is transposed. Washing machine according to claim 23, characterized in that: the first articulation unit generates a torque in a different direction between the first section and the third section. Washing machine according to claim 24, characterized in that: the first articulation unit includes: an elastic member; and a cam unit deforming the elastic member as the cap assembly rotates and converting the restoring force exerted from the deformed elastic member to a rotational force, wherein the cam unit includes: a rotational cam on which a conversion surface is formed, the conversion surface including a first inclined surface corresponding to the first section and a second inclined surface corresponding to the third section, wherein the first inclined surface and the second inclined surface are inclined in a different direction from each other. 26. Washing machine, characterized in that it comprises: an open cabinet in an upper portion; an upper cover coupled to the upper portion of the cabinet and including an opening for loading and unloading laundry thereon; a lid assembly pivotally coupled to the top cover for opening and closing the opening; and a first pivot unit connecting the cover assembly with the upper cover, wherein when the cover assembly rotates to close, the first pivot unit reduces a rotation speed of the cover assembly by a first section, and increases a cap assembly rotation speed by a third section after the first section is transposed. Washing machine according to claim 26, characterized in that: the lid assembly is rotated for closure by sequentially passing through the first and third sections. Washer according to claim 26, characterized in that: the first pivot unit generates a torque in an opening direction of the cover assembly in the first section and generates a torque in a closing direction of the cover assembly in the third section. A washing machine according to claim 26, characterized in that: the first articulation unit includes: an elastic member deformed when the lid assembly rotates; and a cam unit converting a deformed elastic member restoration force into a rotational force and generating a torque in a lid assembly opening direction in the first section and a torque in a lid assembly closing direction in the third section. section. Washing machine according to claim 29, characterized in that: the cam unit includes: an axle connected to the upper cover; a rotational cam rotating together with the cap assembly; and an alternative motion cam connected to the shaft such that its rotation is limited and deforming the elastic member when displaced by the rotational cam along the shaft, wherein the rotational cam includes a conversion surface that converts an exerted force to from the reciprocating motion cam in a rotational force, wherein the conversion surface includes a first inclined surface corresponding to the first section and a second inclined surface corresponding to the third section, wherein the second inclined surface is inclined in an opposite direction from of the first inclined surface, so that a torque is generated in a different direction between the first section and the third section by a force exerted from the alternate motion cam. Washing machine according to claim 30, characterized in that: the reciprocating motion cam includes an acting surface formed in correspondence with the conversion surface and being in face-to-face contact with the super-surface. - conversion area. A washing machine according to claim 26, further comprising: a second hinge unit coupling the lid assembly to the upper cover, wherein the second hinge unit includes a fluid which is compressed when the cap assembly rotates so that a rotation speed of the cap assembly is reduced by a repulsive action of the compressed fluid. 33. Washing machine, characterized in that it comprises: an open cabinet in an upper position; an upper cover coupled to the upper portion of the cabinet including an opening for loading and unloading therethrough for laundry; a lid assembly rotatably coupled to the top cover to open and close the aperture; and a first pivot unit connecting the cover assembly to the top cover and torqueing in one direction of opening of the cover assembly to reduce a closing speed of the cover assembly. Washing machine according to claim 33, characterized in that: the first articulation unit includes: an elastic member; and a cam unit deforming the elastic member as the cap assembly rotates and converting a restoring force exerted from the deformed elastic member to generate torque in an opening direction of the cap assembly. 35. Washing machine, characterized in that it comprises: an open cabinet in an upper portion; an upper cover coupled to the upper portion of the cabinet and including an opening for loading and unloading therethrough laundry; and a door unit pivotally coupled to the top cover to open and close the opening, wherein the door unit is closed without an external force in a first section when the door unit rotational speed is decreased, and without an external force in a second section including an opening angle of 90 degrees or less. Washing machine according to claim 35, characterized in that: when the door unit rotates for closing, the door unit rotational speed is increased by a third section after the first section is transposed. Washing machine according to claim 36, characterized in that: the door unit includes: a lid assembly that opens and closes the opening; and a first pivot unit connecting the cover assembly with the top cover and torqueing in an opening direction of the cover assembly when cap assembly is positioned in the first and second section and generates torque in a closing direction of the assembly. when the lid assembly is positioned in the third section.