KR101267337B1 - Door opening device and refrigerator having the same - Google Patents

Abstract

Disclosed is a door opening device and a refrigerator having the same, which can reduce the number of operations of a driving motor for opening a door, thereby extending the life of the driving motor and related parts. The disclosed door opening device includes: a door opening device for selectively opening the first door and the second door, the door opening device comprising: an operation member for selectively opening both doors by rotation; A rotating cam having a plurality of protrusions for rotating the operating member in contact with the operating member and a plurality of spacers spaced apart from the operating member, the rotating cams being alternately disposed in the rotation direction; A drive motor for rotating the rotary cam in the forward and reverse directions; And a restoring device for repositioning the operating member after the opening of one of the two doors.

Description

DOOR OPENING DEVICE AND REFRIGERATOR HAVING THE SAME}

1 is a perspective view showing a refrigerator to which a door opening device according to the present invention is applied.

2 is an exploded perspective view of the door opening apparatus according to the first embodiment of the present invention.

3 is a plan view of the refrigerator to which the door opening device according to the first embodiment of the present invention is applied, and shows a state in which the door is closed.

4 is a plan view of the refrigerator to which the door opening device according to the first embodiment of the present invention is applied, and shows a state in which the first door is opened by the door opening device.

5 is a plan view of the refrigerator to which the door opening device is applied according to the first embodiment of the present invention, and shows an operation of returning the operation member of the door opening device to an initial position.

6 is a plan view of the refrigerator to which the door opening device according to the first embodiment of the present invention is applied and shows a state in which the second door is opened by the door opening device.

FIG. 7 is a cross-sectional view taken along the line VII-VII 'of FIG. 3.

FIG. 8 is a cross-sectional view taken along the line VII-VII 'of FIG. 3.

9 is a cross-sectional view taken along the line VII-VII 'of FIG. 8.

10 is a plan view of the door opening apparatus according to the second embodiment of the present invention.

11 is a plan view of a door opening apparatus according to a third embodiment of the present invention.

12 is a plan view of a refrigerator to which a door opening device according to a fourth embodiment of the present invention is applied.

13 is a plan view of a refrigerator to which a door opening device according to a fifth embodiment of the present invention is applied.

Explanation of symbols on the main parts of the drawings

10: main body, 11: first door,

12: second door, 20: door opening device,

21: upper cover, 23: support shaft,

25: return spring, 30: operating member,

31: the first extension, 32: the second extension,

33: third extension portion, 34: roller,

34a: dustproof band, 35: weight,

40: rotary cam, 41: protrusion,

42: spacing, 43: magnet,

44: detection sensor, 50: drive motor,

60: rotation resistance unit.

The present invention relates to a door opening device and a refrigerator having the same, and more particularly, to a door opening device and a refrigerator having the same so that the door can be easily opened.

In general, a large refrigerator requires a large force to open the door because the door to open and close the storage compartment is large. This is because the door weight is not only heavy but also the pressure difference between the inside and the outside of the storage compartment is caused by the temperature drop of the storage compartment when it is operated. Therefore, in recent years, such a refrigerator has been installed in the door opening device to open the door by pushing in the direction of opening the door to open the door.

Korean Laid-Open Patent Publication No. 2006-40436 discloses a refrigerator having a door opening device. This refrigerator is a double door type refrigerator having storage compartments mutually partitioned on both sides, and having a left door and a right door for opening and closing of each storage compartment. The door opening device of the refrigerator includes a drive motor for forward rotation and reverse rotation, and a main cam rotated by the drive motor. In addition, a first sub cam operated by the main cam and opening the left door, and a second sub cam operated by the main cam and opening the right door are also provided.

The door opening device opens the left door by operating the first sub cam by rotating the main cam clockwise by the rotation operation of the drive motor. The main cam rotates counterclockwise by the reverse rotation operation of the drive motor to open the right door by operating the second sub cam.

However, the door opening device includes a step in which the operation of the driving motor rotates in the first direction to operate the main cam and a step in which the main cam is returned to the initial position by rotating in the second direction (reverse direction) after the door is opened. The drive motor had to operate twice to open one door. That is, the drive motor had to rotate in the first direction and then rotate in the second direction. Therefore, the door opening device has a frequent operation of the drive motor, the life of the drive motor and the relay for controlling it could be shortened.

If the other door is opened after the other door is opened, the driving motor rotates in the first direction to open one door, and then reversely rotates in the second direction to return to the original position. Further rotating in the second direction to open the door, and rotating in the first direction to return to its original position. Therefore, in this case, the driving frequency of the driving motor is frequent and there is a problem that the opening of the door is delayed.

The present invention is to solve the above problems, an object of the present invention is to provide a door opening device and a refrigerator having the same to reduce the number of operation of the drive motor for opening the door to extend the life of the drive motor and related parts. It is.

Another object of the present invention is to provide a door opening device and a refrigerator having the same so that the door can be quickly opened.

According to an aspect of the present invention, there is provided a door opening device, including: an operating member for selectively opening the two doors by rotation; A rotating cam having a plurality of protrusions for rotating the operation member in contact with the operation member and a plurality of separation portions spaced apart from the operation member, and the protrusions and the separation portion alternately disposed in a rotational direction; A drive motor for rotating the rotary cam in a forward direction and a reverse direction; And a restoring device for repositioning the operating member after the opening of at least one of the two doors.

In addition, the rotary cam is characterized in that the plurality of protrusions are arranged at intervals of 120 degrees.

In addition, the rotary cam is characterized in that the plurality of protrusions are arranged at intervals of 90 degrees.

In addition, the rotary cam is characterized in that the plurality of protrusions are arranged at intervals of 180 degrees.

In addition, the door opening device of the present invention is characterized in that it comprises a sensing device for detecting the rotation position of the rotary cam for the operation control of the drive motor.

In addition, the sensing device is characterized in that it comprises a magnet provided at the front end of each of the projections, and a sensing sensor provided on the outside of the rotary cam to detect the magnet.

In addition, the actuating member extends toward the rotating cam and is in contact with the protrusion and is spaced apart from the spaced apart portion, and extends toward the inner surface of the first door and rotates the first door when rotated in the first direction. And a second extension part which presses and a third extension part which extends toward an inner surface of the second door and presses the second door when rotated in a second direction.

In addition, the operation member is characterized in that the distance from the end of the first extension portion to the center of rotation is longer than the distance from the end of the second and third extension portion to the center of rotation.

In addition, the operation member is characterized in that it further comprises a roller provided at each end of the first to third extension.

In addition, the rollers are characterized in that it comprises a dustproof band installed around the outer surface.

In addition, the first extending portion of the operating member is characterized in that located in the spaced apart portion of the rotary cam in the initial state.

In another aspect, the present invention is characterized in that it further comprises a weight installed in at least one of the first to third extension portion and disposed in a position spaced apart from the center of rotation.

In addition, the present invention includes a first curved projection provided on the inner surface of the first door, and a second curved projection provided on the inner surface of the second door and proximate the first curved projection, the operation member is the rotary cam A first extension extending toward and contacting the protrusion of the rotary cam and spaced apart from the spacer, and extending between the first and second curved protrusions and selectively depending on the direction of rotation. It characterized in that it comprises a second extension portion for pressing.

In another aspect, the present invention is characterized in that it further comprises a weight installed in at least one of the first and second extension portion disposed in a position spaced apart from the center of rotation.

In addition, the present invention is characterized in that it further comprises a rotation resistance unit for imparting a rotational resistance to the operating member to rotate the operating member slowly.

In addition, the rotation resistance unit is characterized in that it comprises a rotary oil damper installed in the center of rotation of the operating member.

In addition, the restoring device is characterized in that the spring to give a restoring force to the operating member.

The first and second doors each include a handle, and each handle is provided with an operation unit for controlling the operation of the drive motor.

In addition, the door opening device according to the present invention includes an operation member for opening the door by rotation; A rotating cam having a plurality of protrusions for rotating the operating member in contact with the operating member and a plurality of spacers spaced apart from the operating member, and the protrusions and the spacer being alternately arranged in a rotational direction; A drive motor for rotating the rotary cam; And a restoring device for repositioning the operating member after the door is opened.

In addition, the refrigerator according to the present invention is a main body having a first storage compartment and a second storage compartment partitioned with each other, the first and second doors to open and close the first and second storage compartments respectively, and the first and second doors selectively A door opening device for opening the door, wherein the door opening device comprises: an operation member for selectively opening the two doors by rotation; A rotating cam having a plurality of protrusions for rotating the operation member in contact with the operation member and a plurality of separation portions spaced apart from the operation member, and the protrusions and the separation portion alternately disposed in a rotational direction; A drive motor for rotating the rotary cam in a forward direction and a reverse direction; And a restoring device for repositioning the operating member after the opening of at least one of the two doors.

In addition, the refrigerator according to the present invention includes a main body having a storage compartment, a door for opening and closing the storage compartment, a door opening device for opening the door, and the door opening device comprising: an operation member for opening the door by rotation; A rotating cam having a plurality of protrusions for rotating the operation member in contact with the operation member and a plurality of separation parts spaced apart from the operation member, and the protrusions and the separation part alternately disposed along a rotational direction; A drive motor for rotating the rotary cam; And a restoring device for repositioning the operating member after the door is opened.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a refrigerator to which a door opening device according to the present invention is applied. The refrigerator includes a main body 10 in which a first storage compartment (not shown) and a second storage compartment (not shown) are mutually partitioned. The first door 11 and the second door 12 are installed at both sides of the main body 10 to open and close the first storage chamber and the second storage chamber, respectively. In such a refrigerator, a first storage compartment generally constitutes a freezing compartment, and a second storage compartment constitutes a refrigerating compartment. The first door 11 and the second door 12 are rotatably coupled to the main body 10 by the upper and lower hinge devices 13. In addition, handles 14 and 15 are provided on the front surfaces of the doors 11 and 12.

The door opening device 20 is installed above the main body 10. The door opening device 20 pushes the upper portions of the first door 11 and the second door 12 to the front so that the user can easily open each door.

2 to 6 show a door opening apparatus according to the first embodiment. As shown in FIGS. 2 and 3, the door opening device 20 provides an opening of the operation member 30 and the two doors 11 and 12 that selectively open the two doors 11 and 12 by rotation. Rotation cam 40 for rotating the operation member 30, drive motor 50 for rotating the rotary cam 40 in the forward and reverse directions. The rotary cam 40 is installed in the cam cover 52. And these parts are all accommodated in the upper case 21 and the lower case 22. The lower case 22 is fixed to the upper surface of the body 10, the upper case 21 and the lower case 22 are coupled to each other by fastening a plurality of fixing screws (23).

The rotary cam 40 includes three protrusions 41 for rotating the operating member 30 in contact with the operating member 30 and three spaced portions 42 spaced apart from the operating member 30. . Each protrusion 41 and each spacer 42 are alternately arranged in the rotational direction, and the protrusions 41 are arranged at intervals of 120 degrees. Each protrusion 41 is made of a curved surface, each spacing 42 is a bone curved surface.

The cam cover 52 accommodating the rotary cam 40 is fixed to the upper surface of the lower case 22 by fastening the fixing screw 53, and the driving motor 50 is fixed to the upper surface of the cam cover 52. The shaft 51 of the drive motor 50 passes through the cam cover 52 and extends into the cam cover 52 and is coupled to the rotary cam 40. Therefore, the rotary cam 40 rotates inside the cam cover 52 when the driving motor 50 operates.

The operating member 30 is rotatably coupled to the upper surface of the lower case 22 in front of the rotary cam 40. As shown in FIG. 2, the support shaft 24 is provided on the upper surface of the lower case 22 for such coupling.

As shown in FIG. 3, the operation member 30 includes a first extension 31 extending from the rotation center toward the rotation cam 40 and a second extension extending from the rotation center toward the inner surface of the first door 11. A part 32 and a third extension part 33 extending from the center of rotation toward the inner surface of the second door 12 are provided. The actuating member 30 is of the "Y" shape. The first extension portion 31 of the operating member 30 is such that its end is in contact with the protrusion 41 of the rotary cam 40 but spaced apart from the spaced portion 42 of the rotary cam 40. The operating member 30 has a distance L1 from the end of the first extension part 31 to the center of rotation than the distance L2 from the ends of the second and third extension parts 32, 33 to the center of rotation. long. This is an application of the lever principle. 4 and 6, although the rotary cam 40 rotates the first extension portion 31 of the operation member 30 with a small force, the second or third extension portions 32 and 33 are larger. The first and second doors 11 and 12 can be easily opened by pressing the inner surfaces of the first or second doors 11 and 12 with a force.

Rollers 34 are installed at ends of the first to third extension parts 31, 32, 33 of the operation member 30, respectively. When the door opening device 20 operates, the friction between the first extension part 31 and the rotary cam 40 is prevented, and the second and third extension parts 32 and 33 and the first and second doors ( This is to prevent the friction between 11 and 12). 3 and 7, each of the rollers 34 is provided with a vibration band 34a made of silicon, rubber or the like around the outer surface. The vibration and vibration of the rotary cam 40 and the operating member 30 is to be damped by the vibration band 34a.

The first extension part 31 of the operation member 30 is provided with a return spring 25 for returning the operation member 30 to the initial position after opening the door. The return spring 25 has one end connected to the first extension part 31 and the other end connected to the upper surface of the refrigerator main body 10 to impart an elastic restoring force to the first extension part 31. Although the coil type return spring 25 is illustrated as a device for restoring the operating member 30 in the drawing, the restoring device may be made of an elastic member such as a torsion spring, a spiral spring, and rubber.

In this way, since the elasticity of the return spring 25 acts on the operation member 30, it is restored to the initial state as shown in FIG. In the initial state, the end of the first extension part 31 is positioned at the separation part 42 of the rotary cam 40, and the driving motor 50 is the separation part 42 and the first extension part of the rotary cam 40. The operation stops when the position of (31) coincides. For this operation, the door opening device 20 is provided with a detection device for detecting the rotational position of the rotary cam 40 to control the operation of the drive motor 50. The sensing device includes a magnet 43 provided at the tip of each protrusion 41 of the rotary cam 40 and a detection sensor fixed to the cam cover 52 outside the rotary cam 40 so as to detect the magnet 43. 44). The sensor 44 is composed of a conventional reed switch. The sensing device is not limited thereto, and an optical sensor for detecting the position of the protrusion 41 or a limit switch for detecting the position through contact with the protrusion may be used.

As shown in FIGS. 2 and 3, the first extension part 31 of the operating member 30 is provided with a weight 35 having a predetermined weight at a position spaced apart from the rotation center of the operating member 30. do. The weight is applied to the first extension part 31 so that the operation member 30 rotates slowly in the process of returning the operation member 30 by the elasticity of the return spring 25 so as to reduce noise due to a collision. It is. In addition, it is to prevent the shaking of the operating member (30). The weight 35 may be installed in the second and third extension parts 32 and 33, but the effect of delaying the rotation of the operating member 30 may be spaced apart from the center of rotation of the operating member 30 and the weight 35. Since the larger it can be improved, it is better to install in the relatively long first extension portion 31.

A rotational resistance unit 60 is provided at the rotational center of the operation member 30 to impart rotational resistance to the operation member 30. This imparts a rotational resistance to the operating member 30 to rotate slowly when the operating member 30 returns, thereby preventing the operating member 30 from colliding with the rotating cam 40 or shaking the operating member 30 during operation. This is to minimize. The rotation resistance unit 60 may be implemented as a rotary oil damper as shown in FIGS. 8 and 9.

The rotary oil damper has a cylindrical case 61 accommodating oil, a fixed blade 62 fixed to the support shaft 24 entering the case 61, and an inner surface of the case 61 to rotate together with the case 61. It is provided in and includes a rotary blade 63 having at least one oil distribution hole (64). The case 61 is rotated together with the operation member 30 by the outer surface is coupled to the operation member (30). When the case 61 and the rotary blade 63 rotate by the operation of the operation member 30, the oil damper flows while the oil inside the case 61 flows into the oil distribution hole 64 of the rotary blade 63. Since resistance is generated, rotational resistance can be given to the operating member 30. Here, the oil damper is exemplified as the rotation resistance unit 60, but a conventional gear damper may be employed as the rotation resistance unit 60.

In addition, the door opening device 20 controls the operation units 16 and 17 provided on the handles 14 and 15 of the first and second doors 11 and 12 so as to control the operation of the driving motor 50. Include. The manipulation units 16 and 17 may be sensing sensors that detect when the user grasps the handles 14 and 15, or may be a power switch that directly opens and closes the power applied to the driving motor 50. When the operation units 16 and 17 are detection sensors, a detection signal of the detection sensor may be transmitted to a controller (not shown) of the refrigerator, and the controller may control the operation of the driving motor 50. In addition, the control unit for controlling the door opening device 20 may be configured together with the control unit for controlling the overall operation of the refrigerator or may be configured separately.

Next, the operation of the door opening device 20 will be described.

As shown in FIG. 3, the driving motor 50 does not operate unless the handles 14 and 15 are grasped while the first door 11 and the second door 12 are closed. Therefore, the initial state is maintained. That is, the first extension part 31 of the operation member 30 is located at the center of the separation part 42 of the rotary cam 40.

As shown in FIG. 4, when the user grabs or pulls the handle 14 of the first door 11 to open the first door 11, the driving motor 50 operates while the manipulation unit 16 is operated. do. At this time, as the rotary cam 40 rotates clockwise (first direction) by the operation of the driving motor 50, the protrusion 41 pushes the first extension 31 of the operating member 30, thereby operating the member ( 30) rotates counterclockwise (second direction). Therefore, the second extension part 32 pushes the inner surface of the first door 11 so that the first door 11 is easily opened. As shown in FIG. 5, when the rotary cam 40 rotates 120 degrees clockwise to detect the magnet 43 provided on the protrusion 41, the driving motor 50 operates. Stop In this state, the rotary cam 40 is rotated 120 degrees, which is the same as the initial state. On the other hand, the operation member 30 is restored to its original state by the elasticity of the return spring 25 at the moment when the pressurization of the first extension portion 31 by the projection (41) of the rotary cam 40 is released.

Thus, the door opening device 20 can open the door only by the operation of the drive motor 50 rotates a predetermined section in one direction, and the door opening device 20 can be minimized since the initial state after the door is opened again. have. Therefore, it is possible to extend the life of the drive motor 50 and related parts.

In addition, when such an operation is made, the inner surfaces of the rotary cam 40 and the first door 11 are in contact with the dustproof band 34a of each roller 34, so that the vibration of the operating member 30 and the rotary cam 40 is in operation. And noise caused by vibration can be prevented. In addition, when the operating member 30 returns, the weight slowly rotates by the action of the weight 35 and the rotational resistance unit 60, so that the operating member 30 collides with the rotary cam 40 or the operating member 30 is shaken. The phenomenon can be minimized.

As shown in FIG. 6, when the user grabs or pulls the handle 15 of the second door 12 to open the second door 12, the operation of the operation unit 17 is performed while the driving motor 50 is reversed. Direction. At this time, as the rotary cam 40 rotates counterclockwise (second direction) by the operation of the driving motor 50, the protrusion 41 pushes the first extension 31 of the operating member 30, thus operating member. 30 rotates clockwise (first direction). Therefore, in this case, the third extension part 33 pushes the inner surface of the second door 12 to open the second door 12. After opening of the second door 12, the rotary cam 40 stops by rotating 120 degrees, and the operation member 30 is also restored to the initial state by the elasticity of the return spring 25. As described above, the present invention may minimize the operation of the driving motor 50 because the driving motor 50 is sufficient to operate once in either direction when the doors 11 and 12 are opened.

Even when the first door 11 and the second door 12 are continuously opened, both the doors 11 and 12 are rotated only by the driving motor 50 rotating clockwise and then counterclockwise again. Can open Therefore, as compared with the conventional case, not only can the operation frequency of the driving motor 50 be significantly reduced, but as a result, the two doors 11 and 12 can be opened quickly.

10 is a second embodiment of a door opening device. The door opening device 120 of the second embodiment has a different shape of the rotary cam 140. The rotary cam 140 is formed of four protrusions 141 and four spaced apart portions 142, and each protrusion 141 and each spaced portion 142 are alternately arranged in the rotational direction, and the protrusions 141 are It is arranged at 90 degree intervals. And the position of the sensor 144 is somewhat changed so that the protrusion 141 and the sensor 144 in the initial state. The rest of the configuration is the same as in the first embodiment. The second embodiment differs in that the rotating cam 140 rotates 90 degrees when the door is opened, and the rest of the operation is performed in the same manner as in the first embodiment.

11 is a third embodiment of a door opening device. In the door opening device 220 of the third embodiment, the protrusion 241 and the spacer 242 of the rotary cam 240 are respectively formed at two positions, and each protrusion 241 and the spacer 242 are rotated in the direction of rotation. Alternately arranged, the protrusions 241 are arranged at intervals of 180 degrees. In addition, the position of the sensor 244 is slightly changed compared to the first embodiment so that the protrusion 241 and the sensor 244 coincide in the initial state. The rest of the configuration is the same as in the first and second embodiments. The third embodiment is different in that the rotating cam 240 rotates 180 degrees when the door is opened, and the rest of the operation is performed in the same manner as in the first and second embodiments.

12 is a fourth embodiment of a door opening device. In the door opening device 320 according to the fourth embodiment, the operation member 330 is different from that of the first embodiment, and the first curved protrusion 81 is formed on the inner surfaces of the first door 11 and the second door 12. ) And the second curved protrusion 82 are different. The first and second curved protrusions 81 and 82 are disposed in close proximity to each other. In addition, the operating member 330 may be in contact with the protrusion 341 of the rotary cam 340 and spaced apart from the spaced portion 342, and the first and second curved protrusions 81 and 82. The second extension part 332 extends therebetween and selectively presses the first and second curved protrusions 81 and 82 according to the rotational direction. Rollers 334 are provided at the end portions of the first and second extension portions 331 and 332, respectively. This causes the two doors 11 and 12 to be pressed by pressing one of the first and second curved protrusions 81 and 82 while the operating member 330 rotates clockwise or counterclockwise by the operation of the rotary cam 340. It is to be opened selectively. Other configurations and operation principles are not significantly different from those in the first embodiment, and thus description thereof is omitted.

13 is a refrigerator according to a fifth embodiment of the present invention. The fifth embodiment is a refrigerator having one door 411. In the refrigerator, the door opening device 420 has a difference in that the third extension part of the operation member 430 is excluded in comparison with the first embodiment. That is, the operation member 430 includes only the first extension part 431 and the second extension part 432. In addition, since the fifth embodiment only needs to open one door 411, the driving motor rotates only in one direction. Other configurations and operating principles are not significantly different from the above-described embodiments, and thus descriptions thereof will be omitted.

As described above in detail, the door opening device according to the present invention can perform the opening of the door only by the operation in which the driving motor rotates a predetermined section in one direction, and the initial state even if the driving motor does not operate in the reverse direction after the opening of the door. Since the operation control of the drive motor can be minimized. Therefore, there is an effect that can extend the life of the drive motor and related parts.

In addition, in the present invention, even when the first door and the second door are continuously opened, both doors can be opened only by the driving motor rotating clockwise and then rotating counterclockwise again. Therefore, as compared with the conventional case, it is possible not only to significantly reduce the number of operations of the driving motor but also to quickly open the two doors.

In addition, the present invention has an effect that can prevent the noise due to the vibration or vibration of the operating member and the rotary cam in the operation process because the inner surface of the rotating cam and the door contact with the vibration band of each roller.

In addition, the present invention has the effect of minimizing the phenomenon that the operating member collides with the rotating cam or the operating member is shaken because the rotation slowly by the action of the weight and the rotation resistance unit when the operating member returns.

Claims (46)

In the door opening device for selectively opening the first door and the second door, An actuating member for selectively opening the two doors by rotation; A rotating cam having a plurality of protrusions for rotating the operation member in contact with the operation member and a plurality of separation portions spaced apart from the operation member, and the protrusions and the separation portion alternately disposed in a rotational direction; A drive motor for rotating the rotary cam in a forward direction and a reverse direction; And a restoring device for repositioning the operating member after opening at least one of the two doors. The method of claim 1, The rotating cam is a door opening device, characterized in that the plurality of protrusions are arranged at intervals of 120 degrees. delete delete The method of claim 1, And a sensing device for sensing a rotational position of the rotary cam to control the operation of the drive motor. The method of claim 5, The detecting device includes a magnet provided at the front end of each of the protrusions, and a door sensor, characterized in that the sensor installed on the outside of the rotary cam to detect the magnet. The method of claim 1, The actuating member extends toward the rotary cam and is in contact with the protrusion and is spaced apart from the spaced apart portion, and presses the first door when extending toward the inner surface of the first door and rotating in the first direction. And a second extension part extending toward the inner surface of the second door and pressing the second door when the second extension part rotates in the second direction. The method of claim 7, wherein And the actuating member has a distance from an end of the first extension part to a center of rotation longer than a distance from an end of the second and third extension parts to a center of rotation. The method of claim 7, wherein The operating member further comprises a roller provided at each end of the first to third extension portion. 10. The method of claim 9, And each roller includes a dustproof band installed around the outer surface thereof. The method of claim 7, wherein The first opening of the operating member is a door opening device, characterized in that located in the spaced apart portion of the rotary cam in the initial state. 10. The method of claim 9, The door opening device, characterized in that further comprising a weight installed in at least one of the first to third extension portion and disposed in a position spaced apart from the center of rotation. The method of claim 1, A first curved protrusion provided on an inner surface of the first door and a second curved protrusion provided on an inner surface of the second door and proximate to the first curved protrusion, The actuating member extends toward the rotary cam and is in contact with the protrusion of the rotary cam and is spaced apart from the spacer, and extends between the first and second curved protrusions and the first and second curved protrusions. And a second extension unit for selectively pressing the second curved protrusion. delete 14. The method of claim 13, The operating member further comprises a roller provided at each end of the first and second extension portion. delete delete delete The method of claim 1, And a rotational resistance unit to impart rotational resistance to the operation member so as to slowly rotate the operation member. 20. The method of claim 19, The rotation resistance unit comprises a rotary oil damper installed in the rotation center of the operating member. delete The method of claim 1, The first and second doors each include a handle, The door opening device, the door opening device, characterized in that it comprises an operation unit provided on each handle for controlling the operation of the drive motor. In the door opening device for opening the door, An operating member for opening the door by rotation; A rotating cam having a plurality of protrusions for rotating the operating member in contact with the operating member and a plurality of spacers spaced apart from the operating member, and the protrusions and the spacer being alternately arranged in a rotational direction; A drive motor for rotating the rotary cam; And a restoration device for returning the operating member to the original position after the door is opened. A main body having a first storage compartment and a second storage compartment partitioned with each other, first and second doors for opening and closing the first and second storage compartments, and a door opening device for selectively opening the first and second doors; In the refrigerator, The door opening device includes an operation member for selectively opening the two doors by rotation; A rotating cam having a plurality of protrusions for rotating the operation member in contact with the operation member and a plurality of separation portions spaced apart from the operation member, and the protrusions and the separation portion alternately disposed in a rotational direction; A drive motor for rotating the rotary cam in a forward direction and a reverse direction; And a restoring device for displacing the operating member after opening at least one of the two doors. 25. The method of claim 24, The rotating cam is a refrigerator, characterized in that the plurality of protrusions are arranged at intervals of 120 degrees. delete delete 25. The method of claim 24, And a sensing device for sensing a rotational position of the rotary cam to control the operation of the drive motor. The method of claim 28, The sensing device is a refrigerator, characterized in that it comprises a magnet provided at the front end of each of the projections, and a sensing sensor installed outside the rotary cam to detect the magnet. 25. The method of claim 24, The actuating member extends toward the rotary cam and is in contact with the protrusion and is spaced apart from the spaced apart portion, and presses the first door when extending toward the inner surface of the first door and rotating in the first direction. And a second extension part extending toward the inner surface of the second door and pressing the second door when the second extension part rotates in the second direction. delete 31. The method of claim 30, The operating member further comprises a roller provided at each end of the first to third extension portion. 33. The method of claim 32, Each of the rollers comprises a dustproof band installed around the outer surface. 31. The method of claim 30, And a first extension portion of the operating member is positioned at a spaced portion of the rotary cam in an initial state. 31. The method of claim 30, The refrigerator further comprises a weight installed on at least one of the first to third extensions and disposed at a position spaced apart from the rotation center. 25. The method of claim 24, A first curved protrusion provided on an inner surface of the first door and a second curved protrusion provided on an inner surface of the second door and proximate to the first curved protrusion, The actuating member extends toward the rotary cam and is in contact with the protrusion of the rotary cam and is spaced apart from the spacer, and extends between the first and second curved protrusions and the first and second curved protrusions. And a second extension unit for selectively pressing the second curved protrusion. delete 37. The method of claim 36, The operating member further comprises a roller provided at each end of the first and second extension portion. delete delete delete 25. The method of claim 24, And a rotational resistance unit for imparting a rotational resistance to the operation member for slowly rotating the operation member. delete delete 25. The method of claim 24, The first and second doors each include a handle, The door opening device, characterized in that the refrigerator comprises an operation unit provided on each handle for controlling the operation of the drive motor. A refrigerator having a main body having a storage compartment, a door to open and close the storage compartment, and a door opening device to open the door, The door opening device includes an operation member for opening the door by rotation; A rotating cam having a plurality of protrusions for rotating the operating member in contact with the operating member and a plurality of spacers spaced apart from the operating member, and the protrusions and the spacer being alternately arranged in a rotational direction; A drive motor for rotating the rotary cam; And a restoring device for repositioning the operating member after the door is opened.

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