WO2018150603A1

WO2018150603A1 - Door opening device and refrigerator

Info

Publication number: WO2018150603A1
Application number: PCT/JP2017/024609
Authority: WO
Inventors: 篤史長濃; 洋平森田
Original assignee: シャープ株式会社
Priority date: 2017-02-16
Filing date: 2017-07-05
Publication date: 2018-08-23
Also published as: TW201831851A; MY194482A; TWI647418B; JPWO2018150603A1; SG11201901037SA; CN110268213A; CN110268213B; JP6894967B2

Abstract

This door opening device 50 comprises a door 4a for opening and closing the open side 3a of a body 2, a rotating body 56, a slider 59 disposed on the rotating body 56, and a cam surface 60a for guiding the slider 59, and opens the door 4a by sliding the slider 59 between a starting point Ps and an end point Pe. In this door opening device 50, the tangent of the cum surface 60a is inclined with respect to the moving direction D1 of the slider 59 on the end point Pe, and the slider 59 is rotated in the direction away from a pivot shaft 4c.

Description

Door opening device and refrigerator

The present invention relates to a door opening device for opening a door pivotally supported by a pivot shaft and a refrigerator using the same.

A conventional refrigerator provided with a door opening device is disclosed in Patent Document 1. This refrigerator includes a main body and a door. The main body has a heat insulating box filled with a foam heat insulating material, and has an opening surface on the front surface. The door is filled with foam heat insulating material, and is pivotally supported on the main body by a pivot shaft to open and close the opening surface.

The door opening device includes an egg-shaped plate cam disposed on the upper surface of the main body and a pin disposed on the upper surface of the door. The plate cam rotates about a vertical rotation shaft, and the pin slides on the cam surface of the peripheral surface of the plate cam.

In the refrigerator, when a predetermined operation is performed, the plate cam rotates, and the pin slides on the cam surface between the start point and the end point on the cam surface. As the distance between the sliding position of the pin on the cam surface and the rotation center of the plate cam increases, the door is opened. When the pin leaves the plate cam at the end of the cam surface, the door is manually opened. Thereby, the burden at the time of opening a door can be reduced.

JP 2001-317864 A

However, according to the conventional refrigerator, the tangential direction of the cam surface coincides with the rotation direction of the plate cam on the end point of the cam surface. For this reason, the amount of movement of the pin relative to the rotation angle of the plate cam is small in the vicinity of the end point, and the door cannot be pushed out vigorously when the plate cam moves away from the pin. Therefore, there is a problem that the range for manually opening the door is increased and the convenience is poor.

This invention aims at providing the door opening apparatus which can improve the convenience, and a refrigerator using the same.

In order to achieve the above object, a door opening device according to the present invention includes a main body having an opening surface, a door pivotally supported on the main body portion by a pivot shaft, and opening and closing the opening surface, and the main body portion. A rotating body that rotates about a rotating shaft, a slider disposed on the rotating body, and a cam surface that is disposed on the door and guides the slider. In the door opening device that slides between a start point and an end point on a cam surface to open the door, a tangent line of the cam surface is inclined with respect to the moving direction of the slider on the end point, and the slide The moving element rotates in a direction away from the pivot shaft.

Further, the present invention provides the door opening device having the above-described configuration, wherein an angle formed between a straight line connecting the rotating shaft and the slider at the end point and a straight line connecting the pivot shaft and the slider at the end point is set. It is characterized by being orthogonal or obtuse.

Further, according to the present invention, in the door opening device configured as described above, an inclination angle of a tangent line of the cam surface with respect to a moving direction of the slider is 45 ° or more on the end point.

Further, according to the present invention, in the door opening device having the above-described configuration, the slider rotates at a constant speed.

Further, according to the present invention, in the door opening device configured as described above, the two doors are arranged side by side on the front surface of the main body, and the pivot shafts of the doors are arranged on both sides of the main body, respectively. One of the doors is opened by the normal rotation of the one rotating body, and the other door is opened by the reverse rotation.

According to the present invention, in the door opening device configured as described above, the cam surface is disposed on one of the upper and lower surfaces of the door and a recess is provided, and the recess is disposed forward and adjacent to the cam surface. The door is opened facing the door.

Further, the present invention is characterized in that in the door opening device configured as described above, a plurality of the sliders are provided on the rotating body.

Further, the refrigerator of the present invention includes the door opening device having the above-described configuration, wherein the slider is arranged on the upper surface of the main body and the cam surface is arranged on the upper surface of the door.

According to the present invention, the tangent line of the cam surface is inclined with respect to the moving direction of the slider on the end point of the cam surface, and the slider is rotated in a direction away from the pivot shaft. Thereby, a door is pushed out vigorously and the range which opens a door manually can be made small. Therefore, the convenience of the door opening / closing mechanism and the refrigerator can be improved.

The front view which shows the refrigerator of 1st Embodiment of this invention. The top view which shows the closed state of the door of the refrigerator of 1st Embodiment of this invention. The top view explaining the operation | movement which opens the door of the refrigerator of 1st Embodiment of this invention. The top view explaining the operation | movement which opens the door of the refrigerator of 1st Embodiment of this invention. The top view explaining the operation | movement which opens the door of the refrigerator of 1st Embodiment of this invention. The top view explaining the state near the end point of the door of the refrigerator of a 1st embodiment of the present invention. A top view for explaining the state in the vicinity of the end point of the refrigerator door of the comparative example The top view which shows the closed state of the door of the refrigerator of 2nd Embodiment of this invention. The top view which shows the closed state of the door of the refrigerator of 3rd Embodiment of this invention. The top view explaining the operation which opens the door of the refrigerator of a 3rd embodiment of the present invention. The top view explaining the operation which opens the door of the refrigerator of a 3rd embodiment of the present invention. The top view which shows the closed state of the refrigerator of 4th Embodiment of this invention.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. Drawing 1 is a front view showing refrigerator 1 of a 1st embodiment. In the refrigerator 1, a refrigerator compartment 3, a freezer compartment 5, and a vegetable compartment 7 are formed in order from the top of the main body 2 made of a heat insulating box.

A door 4a and a door 4b are arranged side by side on the front side of the refrigerator compartment 3. The door 4a and the door 4b are pivotally supported by a vertical pivot shaft 4c and a pivot shaft 4d arranged on both sides of the main body 2, respectively, and open and close an opening surface 3a (see FIG. 2) on the front surface of the refrigerator compartment 3. . The opening surface on the front surface of the freezer compartment 5 is opened and closed by a sliding door 6. The front opening of the vegetable compartment 7 is opened and closed by a sliding door 8.

A packing (not shown) for preventing cold air leakage is provided on the periphery of the back surface of each door 4a, door 4b, door 6, and door 8. The packing is provided with a magnet (not shown) that is attracted to the front surface of the main body 2.

FIG. 2 shows a top view of the refrigerator 1. A door opening device 50 that opens the door 4a is provided on the upper surfaces of the main body 2 and the door 4a. Similarly, a door opening device 50 that opens the door 4b is provided on the upper surface of the main body 2 and the door 4b. The door opening device 50 includes a drive unit 58 and a guide unit 60.

The drive unit 58 is installed on a support member 51 attached to the upper surface of the main body unit 2. The drive unit 58 includes a motor 52, a worm 53, a worm wheel 54, a reduction gear 55, and a reduction gear 56 (rotary body). The worm 53 is attached to the shaft of the motor 52 and meshes with the worm wheel 54. The reduction gear 55 is attached concentrically with the worm wheel 54. The reduction gear 56 meshes with the reduction gear 55. The reduction gear 56 is provided with a slider 59 protruding downward.

The rotation shaft 56a (see FIG. 6) of the reduction gear 56 forms the rotation center of the slider 59, and is arranged behind the pivot shaft 4c and the pivot shaft 4d.

The guide part 60 is provided on the upper surface of the door 4a and the door 4b, and has a curved cam surface 60a for slidingly guiding the slider 59. The slider 59 slides between the start point Ps and the end point Pe on the cam surface 60a to open the door 4a and the door 4b.

Next, the operation of opening the left door 4a by the door opening device 50 will be described with reference to FIGS. When a predetermined operation button is operated in the closed state of the door 4 a shown in FIG. 2, the slider 59 is rotated at a constant speed by the drive unit 58. At this time, the rotation direction B1 of the slider 59 is the direction away from the pivot shaft 4c in the forward direction (counterclockwise in the figure).

When the slider 59 rotates by a predetermined angle (for example, 45 °) and contacts the starting point Ps on the cam surface 60a, the sliding between the slider 59 and the cam surface 60a is started. For this reason, the idle period during which the slider 59 idles is provided from the closed state of the door 4a until it abuts on the starting point Ps. Due to the idling period, the torque of the motor 52 can be stabilized before the start of the opening operation with a large load when the door 4a is opened by the suction force of the packing.

Further, when the door 4a is closed, the starting point Ps is arranged in front of the moving direction of the slider 59 from the straight line connecting the pivot shaft 4c and the rotation shaft 56a of the reduction gear 56 (see FIG. 6). Thereby, the guide part 60 can be reliably arranged on the upper surface of the door 4a without protruding backward from the door 4a. For this reason, the strength reduction of the guide part 60 and the designability fall of the door 4a by the guide part 60 extending above the main-body part 2 can be prevented.

When the slider 59 further rotates from the starting point Ps of the cam surface 60a, the door 4a is opened as shown in FIG. As shown in FIG. 5, the slider 59 reaches the end point Pe of the cam surface 60a and leaves the cam surface 60a. Thereafter, the door 4a is further opened by the urging force when the slider 59 is separated from the cam surface 60a. Therefore, the burden at the time of opening the door 4a can be reduced.

The end point Pe of the cam surface 60a is set close to the back surface of the door 4a. Thereby, when the slider 59 is distribute | arranged to the end point Pe, the door 4a can be arrange | positioned ahead. Further, the moving direction D1 of the slider 59 on the end point Pe is arranged on a straight line L2 (see FIG. 6) connecting the slider 59 and the pivot shaft 4c. That is, a straight line L1 (see FIG. 6) connecting the rotation shaft 56a of the reduction gear 56 and the end point Pe slider 59 (see FIG. 6), and a straight line L2 connecting the pivot shaft 4c and the end point Pe slider 59 (see FIG. 6). ) Are orthogonal to each other. Thereby, when the slider 59 is arranged at the end point Pe, the door 4a can be arranged further forward.

Note that the straight line L1 and the straight line L2 may be angles that are slightly obtuse than orthogonal. For example, the angle formed by the straight line L1 and the straight line L2 may be 90 ° to 95 °. In this case, the opening angle of the door 4a when the slider 59 is arranged at the end point Pe is slightly smaller than that at the time of orthogonality, and the slider 59 is opened earlier than at the time of orthogonality. Thereby, delay of opening of the slider 59 can be prevented due to manufacturing tolerances between the guide portion 60 and the reduction gear 56 and displacement of the door 4a during long-term use. That is, it is possible to prevent the slider 59 from sliding on the cam surface 60a beyond the angle orthogonal to the straight line L1 and the straight line L2.

Further, the tangent line of the cam surface 60a is inclined at the inclination angle θ (see FIG. 6) with respect to the moving direction D1 of the slider 59 on the end point Pe. Therefore, the door 4a can be pushed out vigorously by the rotating slider 59. If the inclination angle θ is 45 ° or more, the angular velocity of the door 4a to be pushed out can be increased, and more preferably 70 ° or more.

Also, on the end point Pe, the slider 59 rotates in a direction away from the pivot shaft 4c, and pushes the door 4a more vigorously as described later.

The door 4b is similarly opened when the slider 59 rotates in the rotation direction B2 (clockwise in the figure).

FIG. 6 shows a top view for explaining a state in which the slider 59 is arranged in the vicinity of the end point Pe. FIG. 7 shows a top view for explaining a state in which the slider 59 of the door opening device 50 of the comparative example is arranged in the vicinity of the end point Pe. In the comparative example, the rotation direction B1 'of the slider 59 and the inclination direction of the cam surface 60a at the end point Pe are opposite to those in the present embodiment. 6 and 7, the cam surface 60a describes only the vicinity of the end point Pe.

6 and 7 show the same inclination angle θ of the cam surface 60a on the end point Pe. The slider 59 is arranged at a point Pn near the end point Pe when the door 4a is closed by a minute angle β from the state arranged at the end point Pe.

The pivot shaft 4c of the door 4a is arranged to the left of the rotation shaft 56a. When the slider 59 moves from the point Pn to the end point Pe, the door 4a rotates in the opening direction (clockwise in the figure). Since the movement angle of the door 4a is a minute angle β, the cam surface 60a can be considered as a plane between the point Pn and the end point Pe, and the cam surface 60a also rotates clockwise by the angle β. For this reason, the cam surface 60a that makes contact with the slider 59 on the point Pn in FIG. 6 has a larger inclination angle with respect to the straight line L2 than the cam surface 60a that makes contact with the end point Pe. On the other hand, the cam surface 60a that contacts the slider 59 on the point Pn in FIG. 7 has a smaller inclination angle with respect to the straight line L2 than the cam surface 60a that contacts the end point Pe. Therefore, the angle γ between the moving direction D2 of the slider 59 on the point Pn in FIG. 6 and the tangent to the cam surface 60a is larger than the angle γ ′ in FIG. For this reason, the distance which guides the door 4a ahead with respect to rotation of the slider 59 per unit time is larger than this comparative example.

Thereby, the central angle α between the slider 59 on the end point Pe and the slider 59 on the point Pn in this embodiment is smaller than the center angle α ′ of the comparative example. That is, the slider 59 rotating at a constant speed can rotate the door 4a by an angle β in the vicinity of the end point Pe in a shorter time than the comparative example, and the angular velocity of the door 4a is increased. Accordingly, when the slider 59 rotates in the direction away from the pivot shaft 4c at the end point Pe, the door 4a can be pushed out more vigorously than in the approaching direction.

According to this embodiment, since the tangent line of the cam surface 60a is inclined with respect to the moving direction D1 of the slider 59 on the end point Pe of the cam surface 60a, the door 4a can be pushed out vigorously by the rotating slider 59. it can. Moreover, since the slider 59 rotates in the direction away from the pivot shaft 4c at the end point Pe, the angular velocity of the door 4a can be increased in the vicinity of the end point Pe, and the door 4a is pushed out more vigorously. For this reason, the door 4a can be opened more greatly at this momentum, and the convenience of the door opening device 50 and the refrigerator 1 can be improved.

Further, a straight line L1 connecting the rotating shaft 56a and the slider 59 of the end point Pe is orthogonal to a straight line L2 connecting the pivot shaft 4c and the slider 59 of the end point Pe. For this reason, when the slider 59 is arranged at the end point Pe, the door 4a can be disposed forward, and the biasing range of the door 4a to be opened can be further reduced.

Further, since the slider 59 is arranged on the upper surface of the main body 2 and the cam surface 60a is arranged on the upper surface of the door 4a, the refrigerator 1 that can improve convenience can be easily realized.

Second Embodiment
Next, FIG. 8 has shown the top view of the refrigerator 1 of 2nd Embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals. This embodiment is different from the first embodiment in that the door 4a and the door 4b are opened by one drive unit 58. Other parts are the same as those in the first embodiment.

The one drive part 58 is arranged on the upper surface of the main body part 2, and a reduction gear 55, a reduction gear 56, and a worm wheel 54 are provided in a pair of left and right. The worm 53 is attached to the shaft of the motor 52 and meshes with the intermediate gear 57. The intermediate gear 57 meshes with the two worm wheels 54.

In the refrigerator 1 configured as described above, when the door 4a is opened, the intermediate gear 57 rotates in the same direction as the rotation direction B1 due to the rotation of the worm 53, and the reduction gear 56 on the left side in the drawing rotates in the rotation direction B1. Thereby, the slider 59 slides on the cam surface 60a of the door 4a, and the slider 59 moves away from the cam surface 60a at the end point Pe to open the door 4a. On the other hand, when the door 4b is opened, the worm 53 rotates in the opposite direction to that when the door 4a is opened, the intermediate gear 57 rotates in the same direction as the rotation direction B2, and the right reduction gear 56 in the drawing rotates. Rotate in direction B2. Thereby, the slider 59 slides on the cam surface 60a of the door 4b, and the slider 59 is separated from the cam surface 60a at the end point Pe to open the door 4b. Thus, by changing the rotation direction of the motor 52, one of the door 4a and the door 4b can be opened alternatively.

According to this embodiment, the same effects as those of the first embodiment can be obtained. Further, the door 4a and the door 4b are opened by the motor 52 having the door 4a and the door 4b arranged side by side. Thereby, the drive part 58 can be shared and the cost of the door opening apparatus 50 and the refrigerator 1 can be reduced.

<Third Embodiment>
Next, FIG. 9 has shown the top view of the refrigerator 1 of 3rd Embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals. This embodiment is different from the first embodiment in that the door 4a and the door 4b are opened by one drive unit 58. Other parts are the same as those in the first embodiment.

The one drive part 58 is arranged on the upper surface of the main body part 2, and the rotating shaft 56a of the reduction gear 56 is arranged behind the substantial boundary line between the door 4a and the door 4b. The reduction gear 56 is provided with a slider 59a and a slider 59b. The slider 59a and the slider 59b are provided so as to protrude downward from the reduction gear 56 and face each other with the rotation shaft 56a interposed therebetween. The reduction gear 56 can be switched between forward rotation in the rotation direction B1 and reverse rotation in the rotation direction B2.

The guide part 60 is provided in the upper surface of the door 4a and the door 4b, respectively. The guide portion 60 has a curved cam surface 60 a that slides and guides the slider 59. The slider 59 reaches the end point Pe of the cam surface 60a and leaves the cam surface 60a, and the door 4a is urged in the opening direction.

The end point Pe of the cam surface 60a is set close to the back surface of the door 4a. Thereby, when the slider 59 is distribute | arranged to the end point Pe, the door 4a can be arrange | positioned ahead. A straight line L1 connecting the rotation shaft 56a of the reduction gear 56 and the slider 59 of the end point Pe and a straight line L2 connecting the pivot shaft 4c and the slider 59 of the end point Pe are orthogonal or slightly obtuse. Thus, the end point Pe is configured.

Further, the end point Pe is set to be ahead of the pivot shaft 4c. Moreover, the recessed part 65a and the recessed part 65b which opened upwards are each recessedly provided in the guide part 60 of the upper surface of the door 4a and the door 4b. The concave portion 65a and the concave portion 65b are disposed in front of the cam surface 60a. Moreover, the recessed part 65a faces the adjacent door 4b, and a side is open | released, and the recessed part 65b faces the adjacent door 4a, and a side is opened.

In the refrigerator 1 configured as described above, the reduction gear 56 rotates in the rotation direction B1 when the door 4a is opened. As a result, the slider 59a slides on the cam surface 60a of the door 4a, and as shown in FIG. 9, the slider 59 leaves the cam surface 60a at the end point Pe and the door 4a is opened. At this time, the tangent to the cam surface 60a is inclined with respect to the moving direction of the slider 59a on the end point Pe, and the slider 59a rotates in a direction away from the pivot shaft 4c. Thereby, the door 4a can be pushed out vigorously.

Also, it is difficult to stop the motor 52 suddenly immediately after the slider 59a passes the end point Pe. For this reason, as shown in FIG. 10, the end point Pe is set ahead of the pivot shaft 4c. Thereby, when the end point Pe is set at a position where the straight line L1 and the straight line L2 are substantially orthogonal to each other, the end point Pe is set to a position closer to the pivot shaft 4c side than the substantial boundary line between the door 4a and the door 4b. Can do. For this reason, it can suppress that the slider 59a collides with the guide part 60 provided in the door 4b adjacent immediately after passing the end point Pe.

Further, by providing the recess 65a and the recess 65b, as shown in FIG. 11, the slider 59a is a recess that opens the side surface and the upper surface provided on the adjacent door 4b until it passes through the end point Pe and stops. Enter 65b. Thereby, the collision with the slider 59a and the door 4b can be prevented.

When the slider 59a stops, the slider 59a rotates in the reverse direction and rotates in the rotation direction B2, and is arranged at a position before the door is opened.

Similarly, when the door 4b is opened, the reduction gear 56 rotates in the rotation direction B2, and the slider 59b slides on the cam surface 60a of the door 4b. As a result, the door 4b is opened, and the slider 59b that has passed through the end point Pe enters the recess 65a provided in the adjacent door 4a, and the collision between the slider 59b and the door 4a is prevented. In addition, you may provide a buffer member in the rear wall of the recessed part 65a and the recessed part 65b.

According to this embodiment, the same effects as those of the first embodiment can be obtained. Further, the door 4a and the door 4b arranged side by side are opened by a slider 59a and a slider 59b provided in one speed reduction gear 56 (rotating body), respectively. Thereby, the drive part 58 can be shared and the cost of the door opening apparatus 50 and the refrigerator 1 can be reduced.

Moreover, the recessed part 65a and the recessed part 65b which were recessedly provided in the upper surface of the door 4a and the door 4b are distribute | arranged ahead rather than the cam surface 60a, and it faces and opens the adjacent door 4b and the door 4a. Thereby, the collision between the slider 59a and the door 4b is prevented, and the collision between the slider 59b and the door 4a is prevented.

Further, a plurality of sliders 59 a and sliders 59 b are provided on the reduction gear 56. The door 4a and the door 4b may be opened by one slider. In this case, in order to quickly open both the door 4a and the door 4b, the slider is disposed at a position farthest from the opening surface 3a in a standby state before the door is opened.

On the other hand, when the slider 59a and the slider 59b are provided as in this embodiment, the slider 59a and the slider 59b can be brought close to the opening surface 3a. For this reason, time until the slider 59a and the slider 59b contact | abut to the cam surface 60a can be shortened, and the door 4a and the door 4b can be opened more rapidly. Therefore, the convenience of the refrigerator 1 can be improved more.

<Fourth embodiment>
Next, FIG. 12 shows a top view of the refrigerator 1 of the fourth embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. 1 to 6 are denoted by the same reference numerals. This embodiment is different from the first embodiment in that one door 4b (see FIG. 2) and the corresponding door opening device 50 are omitted. Other parts are the same as those in the first embodiment.

According to this embodiment, the same effects as those of the first embodiment can be obtained.

In the first to fourth embodiments, when the door 4a and the door 4b pivotally supported by the main body 2 open and close the lower portion of the main body 2, the door opening device 50 is disposed on the lower surface of the main body 2 and the lower surface of the door. May be.

According to the present invention, it can be used for a refrigerator provided with a door opening device for opening the door.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Main body part 3 Refrigerating room

3a Opening surface

4a, 4b, 6, 8

Door

4c, 4d Pivoting shaft 5 Freezing room 7 Vegetable room 50 Door opening device 51 Support member 52 Motor 53 Warm 54 Warm wheel 55 Reduction gear 56 Deceleration Gear 56 Rotating body 56a Rotating shaft 57 Intermediate gear 58

Drive part

59, 59a, 59b Slider 60 Guide part

60a Cam surface

65a, 65b Recessed part B1, B2 Rotating direction D1, D2, D3 Moving direction L1, L2 Straight line Pe End point Pn Point Ps Start point α Center angle β, γ angle θ Inclination angle

Claims

A main body having an opening surface; a door that pivots on the main body with a pivot shaft to open and close the opening surface; a rotating body that is disposed on the main body portion and rotates about a rotation axis; and the rotating body And a cam surface arranged on the door and guiding the slider, the slider sliding between a start point and an end point on the cam surface. In the door opening device that opens the door, on the end point, the tangent line of the cam surface is inclined with respect to the moving direction of the slider, and the slider rotates in a direction away from the pivot shaft. Feature door opening device.
The angle formed between a straight line connecting the rotating shaft and the slider at the end point and a straight line connecting the pivot shaft and the slider at the end point is an orthogonal or obtuse angle. The door opening device described in 1.
The door opening device according to claim 1 or 2, wherein an inclination angle of a tangent line of the cam surface with respect to a moving direction of the slider on the end point is 45 ° or more.
The two doors are arranged side by side on the front surface of the main body, and the pivot shafts of the doors are arranged on both sides of the main body, respectively. The door opening device according to any one of claims 1 to 3, wherein the door is opened and the other door is opened by reverse rotation.
The cam surface is disposed on one of the upper and lower surfaces of the door and a recess is provided, and the recess is disposed forward of the cam surface and is opened facing the adjacent door. The door opening device according to claim 4.
The door opening device according to claim 5, wherein a plurality of the sliders are provided on the rotating body.
A refrigerator comprising the door opening device according to any one of claims 1 to 6, wherein the slider is arranged on an upper surface of the main body and the cam surface is arranged on an upper surface of the door. . *