CN110268213B

CN110268213B - Door opening device and refrigerator

Info

Publication number: CN110268213B
Application number: CN201780055413.1A
Authority: CN
Inventors: 长浓笃史; 森田洋平
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2017-02-16
Filing date: 2017-07-05
Publication date: 2021-06-29
Anticipated expiration: 2037-07-05
Also published as: CN110268213A; JPWO2018150603A1; MY194482A; WO2018150603A1; TWI647418B; JP6894967B2; SG11201901037SA; TW201831851A

Abstract

The door opening device (50) of the present invention comprises: a door (4a) for opening and closing an opening surface (3a) of a main body part (2), a rotating body (56), a slider (59) arranged on the rotating body (56), and a cam surface (60a) for guiding the slider (59), wherein the slider (59) slides between a starting point Ps and an end point Pe to open the door (4a), characterized in that at the end point Pe, a tangent to the cam surface (60a) is inclined with respect to a moving direction D1 of the slider (59), and the slider (59) rotates in a direction away from a pivot shaft (4 c).

Description

Door opening device and refrigerator

Technical Field

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

Background

Patent document 1 discloses a conventional refrigerator provided with a door opening device. The refrigerator includes a main body and a door. The main body has a heat-insulating box body filled with a foamed heat-insulating material, and has an open surface on the front surface. The door is filled with a foamed heat insulating material, pivotally supported by the main body portion with a pivot shaft, and opens and closes the opening surface.

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

In the refrigerator, the plate cam rotates when a predetermined operation is performed, and the pin slides on the cam surface between the start point and the end point on the cam surface. The door is opened 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 manually opened when the pin moves away from the plate cam at the end of the cam surface. This reduces the burden of opening the door.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent application No. 2001-317864

Disclosure of Invention

Technical problem to be solved by the invention

However, according to the above-described conventional refrigerator, the tangential direction of the cam surface coincides with the rotational direction of the plate cam at the end point of the cam surface. Therefore, the amount of movement of the pin with respect to the rotation angle of the plate cam is small near the end point, and the door cannot be pushed out with a large force when the plate cam is separated from the pin. Therefore, the range of manually opening the door is increased, which causes a problem of poor convenience.

The invention aims to provide a door opening device capable of improving convenience and a refrigerator using the same.

Means for solving the problems

In order to achieve the above object, a door opening device according to the present invention includes: the sliding door includes a main body having an opening surface, a door pivotally supported by the main body at a pivot shaft and opening and closing the opening surface, a rotating body disposed on the main body and rotating about a rotation axis, a slider disposed on the rotating body, and a cam surface disposed on the door and guiding the slider, wherein the slider slides between a start point and an end point on the cam surface to open the door, and is characterized in that a tangent to the cam surface is inclined with respect to a moving direction of the slider at the end point, and the slider rotates in a direction away from the pivot shaft.

In the door opening device of the present invention, the angle formed by the straight line of the slider connecting the rotation axis and the end point and the straight line of the slider connecting the pivot axis and the end point is orthogonal or obtuse.

In the door opening device of the present invention, the inclination angle of the tangent to the cam surface at the end point with respect to the moving direction of the slider is 45 ° or more.

In the door opening device of the present invention, the slider rotates at a constant speed.

In the door opening device of the present invention, the door is provided with a pair of doors, the pair of doors being disposed in parallel on the left and right sides of the front surface of the main body, and the pivot axes of the doors are disposed on both side portions of the main body, respectively.

In the door opening device of the present invention, the cam surface is disposed on one of the upper and lower surfaces of the door, and the recess is recessed, and the recess is disposed forward of the cam surface and opens to the adjacent door.

In the door opening device of the present invention, the rotating body is provided with a plurality of the sliders.

In addition, the refrigerator of the invention is provided with the door opening device with each structure; the slider is disposed on the upper surface of the main body and the cam surface is disposed on the upper surface of the door.

Effects of the invention

According to the present invention, at the end point of the cam surface, the tangent to the cam surface is inclined with respect to the moving direction of the slider, and the slider rotates in the direction away from the pivot shaft. This pushes the door out strongly, and the range in which the door is opened by hand can be reduced. Therefore, the convenience of the door opening device and the refrigerator can be improved.

Drawings

Fig. 1 is a front view of a refrigerator according to a first embodiment of the present invention.

Fig. 2 is a plan view showing a closed state of a door of a refrigerator according to a first embodiment of the present invention.

Fig. 3 is a plan view illustrating an operation of opening a door of the refrigerator according to the first embodiment of the present invention.

Fig. 4 is a plan view illustrating an operation of opening a door of the refrigerator according to the first embodiment of the present invention.

Fig. 5 is a plan view illustrating an operation of opening a door of the refrigerator according to the first embodiment of the present invention.

Fig. 6 is a plan view illustrating a state in the vicinity of the end point of the door of the refrigerator according to the first embodiment of the present invention.

Fig. 7 is a plan view illustrating a state in the vicinity of the end point of the door of the refrigerator according to the comparative example.

Fig. 8 is a plan view showing a closed state of a door of a refrigerator according to a second embodiment of the present invention.

Fig. 9 is a plan view showing a closed state of a door of a refrigerator according to a third embodiment of the present invention.

Fig. 10 is a plan view illustrating an operation of opening a door of a refrigerator according to a third embodiment of the present invention.

Fig. 11 is a plan view illustrating an operation of opening a door of a refrigerator according to a third embodiment of the present invention.

Fig. 12 is a plan view showing a closed state of a door of a refrigerator according to a fourth embodiment of the present invention.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

(first embodiment)

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a front view of a refrigerator 1 according to a first embodiment of the present invention. Refrigerator 1 includes refrigerating compartment 3, freezing compartment 5, and vegetable compartment 7 in this order from above main body 2, which is a heat-insulating box.

Door 4a and door 4b are provided in parallel on the left and right sides in front of refrigerating room 3. Door 4a and door 4b are pivotally supported by

vertical pivot shafts

4c and 4d disposed on both side portions of main body 2, respectively, and open and close an opening surface 3a (see fig. 2) in front of refrigerating compartment 3. The front opening surface of the freezing chamber 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.

Gaskets (not shown) for preventing leakage of cold air are provided on the peripheral portions of the rear surfaces of the

doors

4a, 4b, 6, and 8. The pad is provided with a magnet (not shown) attached to the front surface of the main body 2.

Fig. 2 is a plan view of the refrigerator 1. A door opening device 50 for opening the door 4a is provided on the upper surfaces of the main body 2 and the door 4 a. Similarly, a door opener 50 for opening the door 4b is provided on the upper surfaces of the main body 2 and the door 4 b. The door opening device 50 includes a driving portion 58 and a guide portion 60.

The driving portion 58 is provided on the support member 51 mounted on the upper surface of the main body portion 2. The drive unit 58 includes the motor 52, the worm 53, the turbine 54, the reduction gear 55, and the reduction gear 56 (rotating body). A worm 53 is mounted on the shaft of the motor 52 and engages with a worm gear 54. The reduction gear 55 is mounted coaxially with the turbine 54. The reduction gear 56 is meshed with the reduction gear 55. The reduction gear 56 is provided with a slider 59 projecting downward.

A rotation shaft 56a (see fig. 6) of the reduction gear 56 forms a rotation center of the slider 59 and is disposed rearward of the pivot shaft 4c and the pivot shaft 4 d.

The guide portion 60 is provided on the upper surfaces of the

doors

4a and 4b, and has a curved cam surface 60a that guides the slide 59 to slide. The slider 59 slides between the start point Ps and the end point Pe on the cam surface 60a, thereby opening the

doors

4a and 4 b.

Next, the operation of opening the left door 4a by the door opener 50 will be described with reference to fig. 2 to 5. When a predetermined operation knob is operated in the closed state of the door 4a shown in fig. 2, the slider 59 is rotated at a constant speed by the driving portion 58. At this time, the rotation direction B1 of the slider 59 is a direction (counterclockwise in the drawing) in which it is moved away from the pivot shaft 4c in the front direction.

When the slider 59 rotates by a predetermined angle (e.g., 45 °) and comes into contact with the starting point Ps on the cam surface 60a, the sliding between the slider 59 and the cam surface 60a is started. Therefore, an idling period during which the slider 59 idles is provided from the closed state of the door 4a until it comes into contact with the starting point Ps. During the idling period, the torque of the motor 52 can be stabilized before the start of the opening operation in which the load is large when the door 4a is opened due to the suction force of the gasket.

When the door 4a is closed, the starting point Ps is arranged forward in the moving direction of the slider 59 than a straight line connecting the pivot shaft 4c and the rotation shaft 56a (see fig. 6) of the reduction gear 56. This makes it possible to reliably dispose the guide 60 on the upper surface of the door 4a without projecting the guide rearward of the door 4 a. Therefore, the strength of the guide portion 60 is prevented from being reduced and the door 4a is prevented from being poor in design due to the guide portion 60 extending above the main body 2.

When the slider 59 further rotates from the starting point Ps of the cam surface 60a, the door 4a opens as shown in fig. 4. As shown in fig. 5, the slider 59 reaches the end point Pe of the cam surface 60a, and moves away from the cam surface 60 a. Thereafter, the door 4a is opened more largely by the eccentric force when the slider 59 is separated from the cam surface 60 a. Therefore, the burden when opening the door 4a can be reduced.

The end point Pe of the cam surface 60a is disposed near the back surface of the door 4 a. Thus, the slider 59 can dispose the door 4a further forward when disposed at the end point Pe. At the end point Pe, the moving direction D1 of the slider 59 is arranged on a straight line L2 (see fig. 6) connecting the slider 59 and the pivot shaft 4 c. That is, a straight line L1 (see fig. 6) of the slider 59 connecting the rotation shaft 56a of the reduction gear 56 and the end point Pe is orthogonal to a straight line L2 (see fig. 6) of the slider 59 connecting the pivot shaft 4c and the end point Pe. Thus, the slider 59 can dispose the door 4a further forward when disposed at the end point Pe.

The straight line L1 and the straight line L2 may form an obtuse angle slightly larger than the orthogonal angle. 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 at which the slider 59 is disposed at the end point Pe is smaller than that at the orthogonal time, and the slider 59 is moved away more quickly than that at the orthogonal time. This prevents a delay in the separation of the slider 59 due to manufacturing tolerances between the guide 60 and the reduction gear 56 or due to the displacement of the door 4a during long-term use. That is, the slider 59 is prevented from continuing to slide on the cam surface 60a beyond the angle at which the straight line L1 is orthogonal to the straight line L2.

At the end point Pe, the tangent to the cam surface 60a is inclined at an inclination angle θ (see fig. 6) with respect to the moving direction D1 of the slider 59. Therefore, the door 4a can be pushed out strongly by the rotating slider 59. When the inclination angle θ is 45 ° or more, it is desirable to increase the angular velocity of the pushed door 4a, and it is more preferable to set the inclination angle θ to 70 ° or more.

At the end point Pe, the slider 59 is rotated in a direction away from the pivot shaft 4c, and the door 4a can be pushed out further strongly as described later.

The door 4B is also opened when the slider 59 rotates in the rotating direction B2 (clockwise in the drawing).

Fig. 6 is a plan view illustrating a state where the slider 59 is arranged in the vicinity of the end point Pe. Fig. 7 is a plan view illustrating a state where 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 direction of rotation B1' of the slider 59 and the direction of inclination of the cam surface 60a at the end point Pe are opposite to those in the present embodiment. In fig. 6 and 7, the cam surface 60a only shows the vicinity of the end point Pe.

In fig. 6 and 7, the inclination angle θ of the cam surface 60a at the end point Pe is the same. The slider 59 is disposed at a point Pn near the end point Pe when the door 4a is closed by the slight angle β from the state of being disposed at the end point Pe.

The pivot shaft 4c of the door 4a is disposed leftward of the rotation shaft 56 a. The slider 59 moves from the point Pn to the end point Pe, whereby the door 4a rotates in the opening direction (clockwise direction in the drawing). Since the movement angle of the door 4a is a slight angle β, it is considered that the cam surface 60a is a plane between the point Pn and the end point Pe, and the cam surface 60a is also rotated by the angle β clockwise. Therefore, the inclination angle of the cam surface 60a with which the slider 59 at the point Pn in fig. 6 abuts with respect to the straight line L2 becomes larger than that of the cam surface 60a with which the end point Pe abuts. In contrast, the cam surface 60a at the point Pn in fig. 7 with which the slider 59 abuts has a smaller inclination angle with respect to the straight line L2 than the cam surface 60a at the end point Pe with which it abuts. Therefore, the angle γ of the moving direction D2 of the slider 59 at the point Pn in fig. 6 and the tangent to the cam surface 60a is larger than the angle γ' in fig. 7. Therefore, in the present embodiment, the distance for guiding the door 4a forward with respect to the rotation of the slider 59 per unit time is larger than in the comparative example.

Thus, the central angle α between the slider 59 at the end point Pe and the slider 59 at the point Pn in the present embodiment is smaller than the central angle α' of the comparative example. That is, the slider 59 rotating at the same speed is capable of rotating the door 4a by the angle β in a shorter time in the vicinity of the end point Pe than in the comparative example, and the angular velocity of the door 4a is increased. Therefore, at the end point Pe, the slider 59 rotates in a direction away from the pivot shaft 4c, and the door 4a can be pushed out with a larger force than when rotating in the approaching direction.

According to the present embodiment, at the end point Pe of the cam surface 60a, the tangent to the cam surface 60a is inclined with respect to the moving direction of the slider 59, and therefore the door 4a can be pushed out with a large force by the rotating slider 59. Further, at the end point Pe, since the slider 59 rotates in a direction away from the pivot shaft 4c, the angular velocity of the door 4a can be increased near the end point Pe, and the door 4a can be pushed out with a larger force. Therefore, the door 4a can be opened more largely with this force, and the convenience of the door opening device 50 and the refrigerator 1 can be improved.

Further, a straight line L1 of the slider 59 connecting the rotation shaft 56a and the end point Pe is orthogonal to a straight line L2 of the slider 59 connecting the pivot shaft 4c and the end point Pe. Therefore, when the slider 59 is disposed at the end point Pe, the door 4a can be disposed forward, and the urging range in which the door 4a can be opened can be made smaller.

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

(second embodiment)

Next, fig. 8 shows a plan view of the refrigerator 1 according to the second embodiment. For convenience of explanation, the same reference numerals are given to the same parts as those in the first embodiment shown in fig. 1 to 6. In the present embodiment, the point at which the door 4a and the door 4b are opened by one driving unit 58 is different from that of the first embodiment. The other portions are the same as those of the first embodiment.

One driving unit 58 is disposed on the upper surface of the main body 2, and a pair of the reduction gear 55, the reduction gear 56, and the worm gear 54 is provided on the left and right sides. The scroll 53 is mounted on the shaft of the motor 52 and meshes with the intermediate gear 57. The intermediate gear 57 meshes with the two worm gears 54.

In the refrigerator 1 configured as described above, when the door 4a is opened, the intermediate gear 57 is rotated in the same direction as the rotation direction B1 by the rotation of the scroll 53, and the reduction gear 56 on the left side in the figure is rotated 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 4 a. On the other hand, when the door 4B is opened, the scroll 53 rotates in the opposite direction to when the door 4a is opened, the intermediate gear 57 rotates in the same direction as the rotation direction B2, and the reduction gear 56 on the right side in the figure rotates in the rotation direction B2. Thereby, the slider 59 slides on the cam surface 60a of the door 4b, and the slider 59 moves away from the cam surface 60a at the end point Pe to open the door 4 b. 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 the present embodiment, the same effects as those of the first embodiment can be obtained. The

doors

4a and 4b arranged in parallel on the left and right are opened by a single motor 52. This allows the drive unit 58 to be shared, thereby reducing the cost of the door opener 50 and the refrigerator 1.

(third embodiment)

Next, fig. 9 shows a plan view of the refrigerator 1 according to the third embodiment. For convenience of explanation, the same reference numerals are given to the same parts as those in the first embodiment shown in fig. 1 to 6. In the present embodiment, the point at which the door 4a and the door 4b are opened by one driving unit 58 is different from that of the first embodiment. The other portions are the same as those of the first embodiment.

Next, one driving unit 58 is disposed on the upper surface of the main body 2, and the rotation shaft 56a of the reduction gear 56 is disposed rearward on the approximate boundary line between the door 4a and the door 4 b. The reduction gear 56 is provided with a slider 59a and a slider 59 b. The

sliders

59a and 59b protrude downward from the reduction gear 56 and face each other across the rotation shaft 56 a. In addition, the reduction gear 56 can switch between the normal rotation in the rotation direction B1 and the reverse rotation in the rotation direction B1.

The upper surfaces of the door 4a and the door 4b are provided with guide portions 60, respectively. The guide portion 60 has a curved cam surface 60a for guiding the slide member 59 to slide. The slider 59 reaches the end point Pe of the cam surface 60a, moves away from the cam surface 60a, and biases the door 4a in the opening direction.

The end point Pe of the cam surface 60a is disposed near the back surface of the door 4 a. Thus, the slider 59 can dispose the door 4a further forward when disposed at the end point Pe. The end point Pe is formed by a straight line L1 of the slider 59 connecting the rotation shaft 56a of the reduction gear 56 and the end point Pe and a straight line L2 of the slider 59 connecting the pivot shaft 4c and the end point Pe being orthogonal or slightly obtuse.

Further, the end point Pe is located forward of the pivot shaft 4 c. In addition, a recess 65a and a recess 65b, which are opened upward, are recessed in the guide portions 60 on the upper surfaces of the

doors

4a and 4 b. The recess 65a and the recess 65b are disposed forward of the cam surface 60 a. The concave portion 65a opens laterally to the adjacent door 4b, and the concave portion 65b opens laterally to the adjacent door 4 a.

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 moves away from the cam surface 60a at the end point Pe and the door 4a is opened. At this time, at the end point Pe, the tangent to the cam surface 60a is inclined with respect to the moving direction of the slider 59a, and the slider 59a rotates in a direction away from the pivot shaft 4 c. This allows the door 4a to be pushed out with a large force.

Further, it is not easy to abruptly stop the motor 52 immediately after the slider 59a passes the end point Pe. Therefore, as shown in fig. 10, the end point Pe is located forward of the pivot shaft 4 c. Thus, when the end point Pe is set at a position where the straight line L1 is substantially orthogonal to the straight line L2, the end point Pe can be positioned closer to the pivot shaft 4c than on the substantially boundary line between the door 4a and the door 4 b. Therefore, the slider 59a can be suppressed from colliding against the guide portion 60 provided in the adjacent door 4b immediately after passing through the end point Pe.

Further, by providing the concave portion 65a and the concave portion 65b, as shown in fig. 11, the slider 59a enters the concave portion 65b which is open to the side surface and the upper surface of the adjacent door 4b until the slider stops after passing through the end point Pe. Thereby, collision of the slider 59a with the door 4b can be prevented.

When the slider 59a stops, it rotates in the reverse rotation direction B2 and is disposed 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. Thus, the door 4b is opened, and the slider 59b at the end point Pe enters the recess 65a provided in the adjacent door 4a, whereby the slider 59b is prevented from colliding with the door 4 a. Further, a buffer member may be provided on the rear walls of the

recesses

65a and 65 b.

doors

4a and 4b arranged in parallel on the left and right are opened by

sliders

59a and 59b provided in one reduction gear 56 (rotating body). Thus, the driving portion 58 can be shared, and the cost of the door opening device 50 and the refrigerator 1 can be reduced.

The

concave portions

65a and 65b recessed in the upper surfaces of the

doors

4a and 4b are disposed in front of the cam surface 60a and open to the

adjacent doors

4a and 4 b. This prevents the slider 59a from colliding with the door 4b, and prevents the slider 59b from colliding with the door 4 a.

Further, the reduction gear 56 is provided with a plurality of

sliders

59a and 59 b. The

doors

4a and 4b may be opened by one slider. At this time, in order to quickly open both the

doors

4a and 4b, the slider is disposed at the farthest position from the opening surface 3a in the standby state before the door is opened.

On the other hand, when the

sliders

59a and 59b are provided as in the present embodiment, the

sliders

59a and 59b can be brought close to the opening surface 3 a. Therefore, the time required for the

sliders

59a and 59b to come into contact with the cam surfaces 60a can be shortened, and the

doors

4a and 4b can be opened more quickly. Therefore, the convenience of the refrigerator 1 can be more improved.

(fourth embodiment)

Next, fig. 12 is a plan view of the refrigerator 1 according to the fourth embodiment. For convenience of explanation, the same reference numerals are given to the same parts as those in the first embodiment shown in fig. 1 to 6. 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. The other portions are the same as those of the first embodiment.

According to the present 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 on the main body 2 open and close the lower portion of the main body 2, the door opening device 50 may be disposed on the lower surface of the main body 2 and the lower surface of the door.

According to the present invention, the present invention can be used in a refrigerator including a door opening device for opening a door.

Description of the reference numerals

1 refrigerator

2 main body part

3 refrigerating chamber

3a open face

4a, 4b, 6, 8 door

4c, 4d pivot axle

5 freezing chamber

7 vegetable room

50 door opening device

51 support member

52 motor

53 scroll bar

54 turbine

55 reduction gear

56 reduction 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 recess

B1 and B2 rotation directions

D1, D2, D3 moving direction

L1, L2 straight line

Pe endpoint

Pn point

Ps origin

Central angle of alpha

Angle beta, angle gamma

Angle of inclination theta

Claims

1. A door opening device comprising: a main body having an opening surface, a door pivotally supported by the main body at a pivot axis for opening and closing the opening surface, a rotating body disposed on the main body and rotating about a rotation axis, a slider disposed on the rotating body, and a curved cam surface disposed on the door for guiding the slider, the slider sliding between a start point and an end point on the cam surface to open the door,

at the end point, a tangent to the cam surface is inclined with respect to the moving direction of the slider, and the slider is rotated in a direction away from the pivot shaft, and at the end point, an inclination angle of a tangent to the cam surface with respect to the moving direction of the slider is 45 ° or more.

2. The door opening device according to claim 1,

an angle formed by a straight line of the slider connecting the rotation axis and the end point and a straight line of the slider connecting the pivot axis and the end point is orthogonal or obtuse.

3. Door opening device according to claim 1 or 2,

the two doors are arranged in parallel on the left and right sides of the front surface of the main body, the pivot shafts of the doors are respectively arranged on the two side parts of the main body, one door is opened through the forward rotation of one rotating body, and the other door is opened through the reverse rotation.

4. The door opening device according to claim 3,

the cam surface is disposed on one of upper and lower surfaces of the door, and a recess is recessed therein, and the recess is disposed forward of the cam surface and opens to the adjacent door.

5. The door opening device according to claim 4,

the rotating body is provided with a plurality of the sliding members.

6. A refrigerator is characterized in that a refrigerator body is provided with a refrigerator door,

comprising the door opening device of any one of claims 1 to 5,

the slider is disposed on an upper surface of the body portion, and the cam surface is disposed on an upper surface of the door.