阅读说明：本技术 冰箱 (Refrigerator with a door ) 是由 崔南梂 丁相圭 柳相喆 于 2019-02-20 设计创作，主要内容包括：一种冰箱包括：主体；形成在主体中的储藏室；联接到主体以打开和关闭储藏室的门；以及联接到主体以可旋转地支撑门的铰链,其中门包括形成门的下表面的下板、以及联接到下板并具有铰链凹槽的门盖,铰链包括插入到铰链凹槽中的轴,该轴包括门关闭防止部,该门关闭防止部设置为在门已被打开的状态下防止门自动关闭。(A refrigerator includes: a main body; a storage chamber formed in the main body; a door coupled to the main body to open and close the storage chamber; and a hinge coupled to the body to rotatably support the door, wherein the door includes a lower plate forming a lower surface of the door, and a door cover coupled to the lower plate and having a hinge groove, the hinge including a shaft inserted into the hinge groove, the shaft including a door closing prevention part configured to prevent the door from being automatically closed in a state where the door has been opened.)

1. A refrigerator, comprising:

a main body;

a storage chamber formed inside the main body;

a door coupled to the main body to open and close the storage chamber, and a hinge groove formed on the door at a lower portion of the door; and

a hinge coupled to the main body to rotatably support the door and having a shaft inserted into the hinge groove to form a rotation axis of the door,

wherein the shaft includes a door closure preventer configured to prevent the door from automatically closing when the door is opened at a predetermined angle, an

Wherein the door includes a locking portion configured to prevent the door from being automatically closed by being caught on the door closure preventer when the door is opened at the predetermined angle.

2. The refrigerator of claim 1, wherein

The door closure preventer is integrally formed with the shaft at an upper end of the shaft.

3. The refrigerator of claim 1, wherein

The door closure preventer includes a horizontal cam having a portion protruding convexly in a direction perpendicular to the rotation axis of the door.

4. The refrigerator of claim 3, wherein

The door includes a door cover provided on the lower portion of the door and the hinge groove is formed on the door cover.

5. The refrigerator of claim 4, wherein

The door cover includes an outer wall forming the hinge groove, an

The locking part includes an inner protrusion protruding from an inner circumferential surface of the outer wall toward a center of the hinge groove to be caught on the horizontal cam.

6. The refrigerator of claim 5, wherein

When the door is opened and the inner protrusion is in contact with the horizontal cam, the inner protrusion is elastically deformed such that the inner protrusion passes over the horizontal cam.

7. The refrigerator of claim 6, wherein

When the door is opened and the inner protrusion passes over the horizontal cam, the inner protrusion is restored by an elastic force and caught on the horizontal cam, thereby preventing the door from being automatically closed.

8. The refrigerator of claim 4, wherein

The locking part includes an elastic locking plate mounted on the door cover.

9. The refrigerator of claim 8, wherein

When the door is opened and the elastic locking plate is in contact with the horizontal cam, the elastic locking plate is elastically deformed such that the elastic locking plate passes over the horizontal cam.

10. The refrigerator of claim 9, wherein

When the door is opened and the elastic locking plate passes over the horizontal cam, the elastic locking plate is restored by an elastic force and caught on the horizontal cam, thereby preventing the door from being automatically closed.

11. The refrigerator of claim 1, wherein

The door closure preventer includes a lower cam having a deflection portion formed on an upper surface thereof; and

the lock portion includes an upper cam having a deflection portion formed on a lower surface thereof to engage with the lower cam.

12. The refrigerator of claim 11, wherein

The lower cam and the upper cam each include a top flat surface, a descending slope surface, a bottom flat surface, and an ascending slope surface formed in this order along a circumferential direction thereof.

13. The refrigerator of claim 11, wherein

The lower cam and the upper cam interact to prevent the door from automatically closing at all angles when the door is opened.

14. The refrigerator of claim 13, wherein

The lower cam and the upper cam each include a top flat surface, a descending inclined surface, a bottom flat surface, and a vertical surface formed in this order along a circumferential direction thereof.

Technical Field

The present disclosure relates to a refrigerator including a door closure preventer to prevent a phenomenon in which a door is automatically closed in an open state.

Background

Generally, a refrigerator is an appliance including a main body provided with a storage chamber therein, a cool air supply system supplying cool air to the storage chamber, and a door opening and closing the storage chamber, thereby storing food in a fresh state.

A door of a refrigerator is normally closed to prevent cold air in a storage chamber from escaping, and is opened to allow a user to put food into or take food out of the refrigerator.

A door of the refrigerator may be rotatably coupled to the main body. In such a revolving door, when the door is opened to put or take food into or out of the refrigerator in a state where the refrigerator is not horizontally installed, the door may be automatically closed due to its own weight.

Disclosure of Invention

Technical problem

The present disclosure is directed to providing a refrigerator capable of preventing a door from being automatically closed by a rotational momentum due to its own weight when a user opens the door to put food into or take food out of the refrigerator.

The present disclosure is directed to a refrigerator in which a door closure preventer is provided inside a door.

The present disclosure is directed to a refrigerator in which a door closure preventer is integrally formed on a shaft of a hinge.

Technical scheme

One aspect of the present disclosure provides a refrigerator, including: a main body; a storage chamber formed inside the main body; a door coupled to the main body to open and close the storage chamber, and a hinge groove formed on the door at a lower portion of the door; and a hinge coupled to the body to rotatably support the door and having a shaft inserted into the hinge groove to form a rotation axis of the door, wherein the shaft includes a door closure preventer configured to prevent the door from being automatically closed when the door is opened at a predetermined angle, and wherein the door includes a locking part configured to prevent the door from being automatically closed by being caught on the door closure preventer when the door is opened at the predetermined angle.

The door closure preventer may be integrally formed with the shaft at an upper end of the shaft.

The door closure preventer may include a horizontal cam having a portion protruding convexly in a direction perpendicular to a rotational axis of the door.

The door may include a door cover provided on a lower portion of the door and the hinge groove is formed on the door cover.

The door cover may include an outer wall forming a hinge groove, and the locking part may include an inner protrusion protruding from an inner circumferential surface of the outer wall toward a center of the hinge groove to be caught on the horizontal cam.

When the door is opened and the inner protrusion is brought into contact with the horizontal cam, the inner protrusion is elastically deformed such that the inner protrusion passes over the horizontal cam.

When the door is opened and the inner protrusion passes over the horizontal cam, the inner protrusion may be restored by an elastic force and caught on the horizontal cam, thereby preventing the door from being automatically closed.

The locking portion may include a resilient locking plate mounted on the door cover.

When the door is opened and the elastic locking plate is brought into contact with the horizontal cam, the elastic locking plate may be elastically deformed such that the elastic locking plate passes over the horizontal cam.

When the door is opened and the elastic locking plate passes over the horizontal cam, the elastic locking plate may be restored by the elastic force and caught on the horizontal cam, thereby preventing the door from being automatically closed.

The door closure preventer may include a lower cam having a deflection portion formed on an upper surface thereof, and the locking part may include an upper cam having a deflection portion formed on a lower surface thereof to engage with the lower cam.

Each of the lower cam and the upper cam may include a top flat surface, a descending slope surface, a bottom flat surface, and an ascending slope surface sequentially formed along a circumferential direction thereof.

The lower cam and the upper cam may interact to prevent the door from automatically closing at all angles when the door is opened.

Each of the lower cam and the upper cam may include a top flat surface, a descending inclined surface, a bottom flat surface, and a vertical surface, which are sequentially formed along a circumferential direction thereof.

Advantageous effects

According to the present disclosure, it is possible to prevent the door from being automatically closed by momentum due to its own weight in the opened state.

According to the present disclosure, the door closure preventer is not exposed to the outside by being disposed inside the door.

According to the present disclosure, since the door closure preventer is integrally formed on the shaft of the hinge, the number of parts may be reduced and the structure may be simplified.

According to the present disclosure, by using the horizontal cam and the locking ball, the closing of the door can be prevented without the lifting motion of the door.

Drawings

Fig. 1 is a perspective view of a refrigerator according to a first embodiment of the present disclosure.

Fig. 2 illustrates a structure for mounting a door on a hinge of the refrigerator of fig. 1.

Fig. 3 is an exploded view of main parts of a hinge and a door of the refrigerator of fig. 1.

Fig. 4 is a top cross-sectional view of a hinge and a door of the refrigerator of fig. 1.

Fig. 5 is an enlarged sectional view of a partial region of fig. 4.

Fig. 6 to 9 are views for explaining the function of the door closure preventer of the refrigerator of fig. 1.

Fig. 10 illustrates a door closure preventer and a locking part according to a second embodiment of the present disclosure.

Fig. 11 to 13 are views for explaining the function of the door closure preventer of the refrigerator of fig. 10.

Fig. 14 shows a door closure preventer and a locking ball according to a third embodiment of the present disclosure.

Fig. 15 shows a door closure preventer and an upper cam according to a fourth embodiment of the present disclosure.

Fig. 16 is a side view of the upper and lower cams of fig. 15.

Fig. 17 shows a door closure preventer and an upper cam according to a fifth embodiment of the present disclosure.

Fig. 18 is a side view of the upper cam and lower cam of fig. 17.

Detailed Description

The configurations shown in the embodiments and the drawings described in the present specification are merely examples of preferred embodiments of the present disclosure, and various modifications may be made at the time of filing the present disclosure instead of the embodiments and the drawings of the present specification.

As used in this specification, the singular forms "a", "an", and "the" may include plural forms unless the context clearly dictates otherwise. The shapes and dimensions of elements in the drawings may be exaggerated for clarity. Like reference numbers or symbols in the various drawings of the present application indicate parts or components that perform substantially the same function.

The terms "comprises" and "comprising" are intended to indicate the presence of the features, numbers, steps, operations, elements, parts, or combinations thereof described in the specification, and not to preclude the presence or addition of one or more other features, numbers, steps, operations, elements, parts, or combinations thereof.

It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms.

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

Fig. 1 is a perspective view of a refrigerator according to a first embodiment of the present disclosure. Fig. 2 illustrates a structure for mounting a door on a hinge of the refrigerator of fig. 1. Fig. 3 is an exploded view of main parts of a hinge and a door of the refrigerator of fig. 1. Fig. 4 is a top cross-sectional view of a hinge and a door of the refrigerator of fig. 1. Fig. 5 is an enlarged sectional view of a partial region of fig. 4.

Referring to fig. 1 to 5, the refrigerator 1 may include: a main body 10 having storage chambers 21 and 22, doors 31, 32, 33, and 34 coupled to the main body 10 to open and close the storage chambers 21 and 22, and a cool air supply device supplying cool air to the storage chambers 21 and 22.

The cool air supply device may include an evaporator, a compressor, a condenser, and an expansion device, and may generate cool air by using latent heat of evaporation of the refrigerant.

The body 10 may include: an inner case forming the storage compartments 21 and 22; an outer case coupled to an outer side of the inner case to form an external appearance of the refrigerator 1; and an insulator provided between the inner and outer housings to insulate the storage compartments 21 and 22.

The body 10 may include: a horizontal partition wall 11 partitioning the storage compartments 21 and 22 into an upper storage compartment 21 and a lower storage compartment 22; and a vertical partition wall 12 partitioning the lower storage chamber 22 from side to side. The upper storage chamber 21 may serve as a refrigerating chamber for storing food in a refrigerating mode by maintaining indoor air at a temperature of about 0 to 5 degrees celsius, and the lower storage chamber 22 may serve as a freezing chamber for storing food in a freezing mode by maintaining indoor air at a temperature of about 0 to-30 degrees celsius.

The storage compartments 21 and 22 may have an open front to allow food to be received and taken out, and the open front of the storage compartments 21 and 22 may be opened and closed by doors 31, 32, 33, and 34 rotatably provided at the front of the storage compartments 21 and 22.

Each of the doors 31, 32, 33, and 34 may be rotatably supported by upper and lower hinges. For example, a hinge 60 may be provided on a lower portion of the door 32 to rotatably support the door 32. Hereinafter, the hinge 60 provided on the lower portion of the door 32 will be described, but the hinge according to the present disclosure may be applied not only to the door 32 but also to the other doors 31, 33, and 34.

The hinge 60 may include a hinge bracket 61 coupled to the main body 10 and a shaft 70 coupled to the hinge bracket 61 to form a rotation axis of the door 32. In the present embodiment, the hinge bracket 61 and the shaft 70 are separately provided and assembled with each other, but unlike this, the hinge bracket 61 and the shaft 70 may be integrally formed.

The hinge bracket 61 may include: a main body coupling part 62 having a substantially vertical plate shape and coupled to the main body 10; and an extension portion 63 extending forward from the main body coupling portion 62 and having a horizontal plate shape. The body coupling portion 62 may be fastened to the body 10 by fastening means such as screws, pins, and bolts.

A hinge pin 64 protruding upward may be formed on the extension portion 63, and a shaft 70 may be coupled to the hinge pin 64. A groove may be formed inside the shaft 70 and the hinge pin 64 may be inserted into the groove of the shaft 70. The hinge pin 64 may include a securing surface 65, the securing surface 65 being formed flat to prevent rotation of the shaft 70. The extension 63 may be provided with a bend point 66 to allow the interference portion 46a of the recloser bar 46 to be captured thereon.

The shaft 70 may be inserted into the hinge groove 54 of the door cover 50 and may form a rotation axis C of the door 32. The shaft 70 may include: a shaft portion 72 formed in a substantially cylindrical shape to guide the rotation of the door 32; and a flange 71 radially outwardly protruded from a lower end of the shaft portion 72 to be in close contact between the lower plate 40 of the door 32 and the extension portion 63 of the hinge bracket 61.

The shaft 70 may include a door closure preventer 100 configured to prevent the door 32 from being automatically closed by momentum due to its own weight in an area where the opening angle of the door 32 is greater than a predetermined angle θ 3 (see fig. 8).

By being disposed inside the hinge groove 54 of the door cover 50, the door closure preventer 100 may not be exposed to the outside. The door closure preventer 100 may be integrally formed with the shaft portion 72. The door closure preventer 100 may be formed at an upper end of the shaft body portion 72.

As shown in fig. 5, the door closure preventer 100 may be a horizontal cam 73 having portions 74 and 75 convexly protruding in a direction perpendicular to the rotation axis C of the door 32. That is, the horizontal cam 73 may have a portion 74 that protrudes convexly in a first direction a1 perpendicular to the rotational axis C of the door 32, and a portion 75 that protrudes convexly in a second direction a2 opposite to the first direction a 1. Therefore, the horizontal cam 73 may have a long rod-shaped cross section when viewed from above.

However, unlike the present embodiment, the horizontal cam 73 may be formed to have only one protruding portion, instead of a plurality of protruding portions.

The shaft 70 as described above may be formed of a material such as plastic and rubber so that friction and noise may be reduced and the door 32 may be smoothly rotated when the door 32 is rotated.

The door 32 may include a front plate forming a front surface of the door 32, a rear plate forming a rear surface of the door 32, an upper plate forming an upper surface of the door 32, and a lower plate 40 forming a lower surface of the door 32. Foam insulation may be provided inside the door 32.

A cylindrical portion 41 having a through hole 42 penetrating the lower plate 40 may be formed on the lower plate 40. The door 32 may include a door cover 50 coupled to the cylinder portion 41. The hinge groove 54 may be formed inside the door cover 50, and the lower side of the hinge groove 54 may be opened. The shaft 70 may be inserted into the hinge groove 54. The door cover 50 may include a support portion 55 protruding outward in a radial direction.

The door 32 may include: a coupling plate 43 coupled to an upper surface of the lower plate 40 to be in close contact with the supporting portion 55 of the door cover 50; and a reinforcement plate 44 coupled to a lower surface of the lower plate 40 to reinforce a coupling force between the lower plate 40 and the door cover 50. The coupling plate 43 and the reinforcement plate 44 may be fastened to the lower plate 40 by a fastening member 45.

When the coupling plate 43 and the reinforcement plate 44 are fastened to the lower plate 40 and then the foam insulator is filled in the door 32, the door cover 50 may be firmly fixed inside the door 32.

However, unlike the present embodiment, the door cover 50 and the lower plate 40 may be integrally formed.

The auto-close lever 46 may be coupled to the lower plate 40 of the door 32 in a region where the opening angle of the door 32 is less than a predetermined angle θ 1 (see fig. 6).

The self-closing lever 46 may be formed in a substantially U-shape, and may have one end on which the fixing portion 46b is formed and the other end on which the interference portion 46a interfered with by the bending point 66 of the hinge bracket 61 is formed. The fixing portion 46b may be firmly fastened to the lower plate 40 of the door 32 by a fastening member 47, and the interference portion 46a may move around the fixing portion 46b by interference with the hinge bracket 61.

The door 32 may include a locking part 110 that prevents the door 32 from being automatically closed by being caught on the door closure preventer 100 in an area where an opening angle of the door 32 is greater than a predetermined angle θ 4 (see fig. 9). That is, in a region where the opening angle of the door 32 is greater than the predetermined angle θ 4 (see fig. 9), as long as the user does not close the door 32 by directly applying an external force to the door 32, the door 32 can be prevented from being automatically closed due to its own weight.

The locking part 110 may be provided on the door cover 50. That is, the door cover 50 may include an outer wall 51 forming the hinge groove 54, and the locking part 110 may be an inner protrusion 53 protruding from an inner circumferential surface 52 of the outer wall 51 toward the center of the hinge groove 54.

Fig. 6 to 9 are views for explaining the function of the door closure preventer of the refrigerator of fig. 1.

The function of the door closure preventer 100 will be described through the rotation process of the door 32 with reference to fig. 6 to 9.

As shown in fig. 6, an area where the opening angle of the door 32 is less than the predetermined angle θ 1 is an area where the automatic closing lever 46 is operated, and in this area, the door closure preventer 100 and the locking part 110 may not be operated.

In this area, as the user pulls the door 32 to increase the opening angle of the door 32, the automatic closing lever 46 is gradually opened and its elastic force is also increased. When the opening angle becomes the predetermined angle θ 1, the automatic closing lever 46 is opened to the maximum, and its elastic force is also maximized. In this area, when the user releases the door 32, the door 32 can be automatically closed by the elastic force of the automatic closing lever 46.

When the user opens the door 32 by further pulling the door 32 in a state where the opening angle of the door 32 is the predetermined angle θ 1, the interference portion 46a of the automatic closing lever 46 passes over the bending point 66 of the hinge bracket 61, so that the automatic closing lever 46 can be restored to its original state. Thus, the self-closing lever 46 can no longer be interfered with by the hinge bracket 60.

As shown in fig. 7 to 9, the horizontal cam 73 and the inner protrusion 110 may interact in a region where the opening angle of the door 32 is between a predetermined angle θ 2 and a predetermined angle θ 4. In this region, the inner protrusion 53 may be elastically deformed so that the inner protrusion 53 may pass over the horizontal cam 73. The inner protrusion 53 may be elastically deformed to be contracted in a direction away from the center point of the hinge groove 54, as shown in fig. 8.

Specifically, in the region where the opening angle of the door 32 is between the predetermined angle θ 2 and the predetermined angle θ 3, as the user pulls the door 32 to increase the opening angle of the door 32, the deformation of the inner protrusion 53 becomes gradually larger, and the elastic force may be accumulated. When the user releases the door 32 in this area, the door 32 can be pressed in the closing direction by the elastic force accumulated in the inner protrusion 53. When the opening angle of the door 32 becomes the predetermined angle θ 3, the deformation of the inner protrusion 53 and the accumulated elastic force can be maximized.

The opening angle of the door 32 is in a region between the predetermined angle theta 3 and the predetermined angle theta 4, and as the user pulls the door 32 to increase the opening angle of the door 32, the deformation of the inner protrusion 53 becomes gradually smaller, and the elastic force may also be reduced. When the user releases the door 32 in this area, the door 32 can be pressed in the opening direction by the elastic force accumulated in the inner protrusion 53. When the opening angle of the door 32 becomes the predetermined angle θ 4, the inner protrusion 53 is restored to its original state, and the elastic force may disappear. Further, when the user releases the door 32 in this state, the inner protrusion 53 is caught on the horizontal cam 73, so that the door 32 can be prevented from being automatically closed.

The angles θ 1, θ 2, θ 3, and θ 4 may be appropriately determined in consideration of the detailed configuration of the refrigerator and the surrounding environment. In the present embodiment, the door closure preventer 100 is the horizontal cam 73, and when the door 32 rotates, no change in height of the door 32 may occur. Therefore, the interval between the upper doors 31 and 32 and the lower doors 33 and 34 can be kept constant, and interference between parts such as hinges and doors can be prevented.

Fig. 10 illustrates a door closure preventer and a locking part according to a second embodiment of the present disclosure. Fig. 11 to 13 are views for explaining the function of the door closure preventer of the refrigerator of fig. 10.

A door closure preventer and a locking part according to a second embodiment of the present disclosure will be described with reference to fig. 10 to 13. The same reference numerals will be assigned to the same components as those in the above-described embodiment, and the description thereof may be omitted.

In the above embodiment, the locking part 110 is the inner protrusion 53 formed on the inner peripheral surface 52 of the door cover 50, but in the present embodiment, the locking part 110 may be the elastic locking plate 200 provided separately from the door cover 50.

A holder 210 configured to mount the elastic locking plate 200 may be formed on the inner circumferential surface 52 of the door cover 50, and the elastic locking plate 200 may be fitted into the holder 210 and disposed in the hinge groove 54 of the door cover 50.

In the present embodiment, a plurality of elastic locking plates 200 are provided to face each other, but the present invention is not limited thereto, and only one of the elastic locking plates 200 may be provided. When only one of the elastic locking plates 200 is provided, durability is somewhat impaired, but the number of parts can be reduced and cost can be reduced.

An area where the opening angle of the door 32 is smaller than the predetermined angle θ 1 (see fig. 6) is an area where the automatic closing lever 46 is operated, and it is the same as the above-described embodiment in which the horizontal cam 100 and the elastic locking plate 200 are not operated.

As shown in fig. 11 to 12, the horizontal cam 73 and the elastic locking plate 110 may interact in a region where the opening angle of the door 32 is between a predetermined angle θ 2 and a predetermined angle θ 4. In this area, the inner protrusion 53 may be elastically deformed so that the elastic locking plate 110 may pass over the horizontal cam 73.

Specifically, in a region where the opening angle of the door 32 is between the predetermined angle θ 2 and the predetermined angle θ 3, as the user pulls the door 32 to increase the opening angle of the door 32, the deformation of the elastic locking plate 110 becomes gradually larger, and the elastic force may be accumulated. When the user releases the door 32 in this area, the door 32 may be pressed in the closing direction by the elastic force accumulated in the elastic locking plate 110. When the opening angle of the door 32 becomes the predetermined angle θ 3, the deformation and accumulated elastic force of the elastic locking plate 110 may be maximized.

In the region where the opening angle of the door 32 is between the predetermined angle θ 3 and the predetermined angle θ 4, as the user pulls the door 32 to increase the opening angle of the door 32, the deformation of the elastic locking plate 110 becomes gradually smaller, and the elastic force may also be reduced. When the user releases the door 32 in the area, the door 32 may be pressed in the opening direction by the elastic force of the elastic locking plate 110. When the opening angle of the door 32 becomes the predetermined angle θ 4, the elastic locking plate 110 is restored to its original state, and the elastic force may disappear. Further, when the user releases the door 32 in this state, the elastic locking plate 110 is caught on the horizontal cam 73, so that the door 32 can be prevented from being automatically closed.

Fig. 14 shows a door closure preventer and a locking ball according to a third embodiment of the present disclosure.

A door closure preventer and a locking ball according to a third embodiment of the present disclosure will be described with reference to fig. 14. The same reference numerals are assigned to the same components as those in the above-described embodiment, and the description thereof may be omitted.

The door closure preventer 100 may be a locking member 300 disposed on an inner circumferential surface of the hinge groove 54. The locking member 300 may include a locking groove 310 formed on an outer circumferential surface thereof.

The door 32 may include a locking ball 320, and the locking ball 320 may be inserted into the locking groove 310 to fix the door 32. Specifically, a mounting groove 340 on which the locking ball 320 is mounted may be formed on the inner circumferential surface 52 of the door cover 50, and the locking ball 320 may be mounted in the mounting groove 340 to be movable back and forth in the radial direction of the door cover 50.

A resilient member 330 may be provided in the mounting groove 340, the resilient member 330 resiliently supporting the locking ball 320 to move the locking ball 320 toward the hinge groove 540.

The locking ball 320 may rotate together with the door 32 in the rotation direction of the door 32 according to the rotation of the door 32. Accordingly, when the door 32 is rotated by a predetermined angle, the locking ball 320 may be moved to a position corresponding to the locking groove 310, and may be inserted into the locking groove 310 by the elastic force of the elastic member 330. When the locking ball 320 is inserted into the locking groove 310, the door 32 is fixed, so that the door 32 can be prevented from being automatically closed due to its own weight.

Fig. 15 shows a door closure preventer and an upper cam according to a fourth embodiment of the present disclosure. Fig. 16 is a side view of the upper and lower cams of fig. 15.

A door closure preventer and an upper cam according to a third embodiment of the present disclosure will be described with reference to fig. 15 and 16. The same reference numerals will be assigned to the same components as those in the above-described embodiment, and the description thereof may be omitted.

The door closure preventer 100 may be a lower cam 400 having a top flat surface 410, a descending slope surface 420, a bottom flat surface 430, and an ascending slope surface 440 sequentially formed along a circumferential direction thereof.

The door cover 50 may include an upper cam 450 that engages the lower cam 400 to prevent the door 32 from closing. The upper cam 450 may have a top flat surface 460, a descending slope surface 470, a bottom flat surface 480, and an ascending slope surface 490 sequentially formed along a circumferential direction thereof to correspond to the lower cam 400.

With the above structure, when the user opens the door 32, the upper cam 450 rotates in the opening direction OP.

Fig. 16 is a side view showing the upper cam 450 and the lower cam 400 when the door 32 is closed, the bottom flat surface 480 of the upper cam 450 is seated on the bottom flat surface 430 of the lower cam 400, and the rising ramp surface 490 of the upper cam 450 is in close contact with the rising ramp surface 440 of the lower cam 400.

When the user opens the door 32 in this state, the upper cam 450 is raised as the rising ramp surface 490 of the upper cam 450 slides on the rising ramp surface 440 of the lower cam 400, and then the upper cam 450 may be lowered again as the falling ramp surface 470 of the upper cam 450 slides on the falling ramp surface 420 of the lower cam 400.

When the user releases the door 32 in a state in which the lowering of the upper cam 450 is completed such that the bottom plane surface 480 of the upper cam 450 is seated on the bottom plane surface 430 of the lower cam 400 and the lower inclined surface 470 of the upper cam 450 is brought into close contact with the lower inclined surface 420 of the lower cam 400, the upper cam 450 may be prevented from rotating in the closing direction CL by being caught on the lower cam 400.

Fig. 17 shows a door closure preventer and an upper cam according to a fifth embodiment of the present disclosure. Fig. 18 is a side view of the upper cam and lower cam of fig. 17.

A door closure preventer and an upper cam according to a fifth embodiment of the present disclosure will be described with reference to fig. 17 and 18. The same reference numerals will be assigned to the same components as those in the above-described embodiment, and the description thereof may be omitted.

The door closure preventer 100 may be a lower cam 500 having a top flat surface 510, a descending inclined surface 520, a bottom flat surface 530, and a vertical surface 540 sequentially formed along a circumferential direction thereof.

In this case, the lower cam 500 may be configured not to receive resistance during rotation in the direction in which the door 32 is opened.

The door cover 50 may include an upper cam 550 that engages the lower cam 500 to prevent the door 32 from closing. The upper cam 550 may have a top flat surface 560, a descending inclined surface 570, a bottom flat surface 580, and a vertical surface 590 formed in sequence along a circumferential direction thereof to correspond to the lower cam 500.

According to the above structure, the lower cam 500 and the upper cam 550 may interact to prevent the door 32 from being automatically closed at all opening angles when the door 32 is opened.

Specifically, fig. 17 is a side view showing the upper cam 550 and the lower cam 500 when the door 32 is closed and the bottom flat surface 580 of the upper cam 550 is seated on the bottom flat surface 530 of the lower cam 500.

When the user opens the door 32 in this state, the upper cam 550 may descend as the descending ramp surface 570 of the upper cam 550 slides on the descending ramp surface 520 of the lower cam 500.

When the lowering of the upper cam 550 is complete, the bottom flat surface 580 of the upper cam 550 may seat on the bottom flat surface 530 of the lower cam 500. Accordingly, in the area where the door 32 is opened, when the bottom flat surface 580 of the upper cam 550 is seated on the bottom flat surface 530 of the lower cam 500, the upper cam 550 does not receive the rotational force, or the upper cam 550 may receive the rotational force in the direction OP in which the door 32 is opened by the interaction of the lower inclined surface 570 of the upper cam 550 and the lower inclined surface 520 of the lower cam 500.

While the present disclosure has been particularly described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure.