Refrigerator

Abstract

A refrigerator of one embodiment comprises: a cabinet having a storage compartment; a door for opening / closing the storage compartment; and a door-opening / closing device for opening the door, wherein the door-opening / closing device comprises a driving unit for generating power, a power transmission unit for transmitting power from the driving unit, a first operating unit which operates upon receiving power from the driving unit, and a second operating unit which operates upon receiving power from the driving unit and operates to open the door to a set angle, the second operating unit comprising a link gear connectable to the power transmission unit, and a link having one side rotatably connected to the link gear and the other side rotatably connected to the door, and when the driving unit operates to automatically open the door, the link gear rotating in the same direction as the opening direction of the door.

Description

refrigerator

[0001] This specification relates to a refrigerator.

[0002] Generally, a refrigerator is a home appliance that allows food to be stored at a low temperature in an internal storage compartment enclosed by a door.

[0003] The storage room is surrounded by insulating walls so that the interior of the storage room is maintained at a temperature lower than the external temperature. Depending on the temperature range of the storage room, the storage room may be called a refrigerator room or a freezer room.

[0004] To put an object into the storage room or take it out of the storage room, the user opens the door.

[0005] Generally, the door is rotatably provided in the cabinet, and a gasket is provided between the door and the cabinet. Therefore, when the door is closed, the gasket is tightly sealed between the door and the cabinet, preventing cold air from leaking from the storage room. The greater the sealing force of this gasket, the greater the effect of preventing cold air leakage.

[0006] To increase the sealing force of the above gasket, the gasket may be formed of a rubber magnet, and a magnet may be provided inside the gasket. However, if the sealing force of such a gasket is increased, a correspondingly large force is required when opening the door.

[0007] Therefore, refrigerators with an automatic door opening function are being provided recently. As a related prior art, Chinese Utility Model Registration No. 218324468 exists.

[0008] One embodiment provides a refrigerator in which the door can be opened automatically and the opening angle of the door increases when the door is opened automatically.

[0009] Optionally or additionally, one embodiment provides a refrigerator in which the door can be opened automatically as well as closed automatically.

[0010] Optionally or additionally, one embodiment provides a refrigerator that can reduce the excessive load applied to the drive unit by the first operating unit separating the door gasket from the cabinet at the beginning of the automatic opening of the door.

[0011] Optionally or additionally, one embodiment provides a refrigerator in which the door can be opened automatically as well as manually by a user.

[0012] A refrigerator according to one aspect may include a cabinet having a storage compartment; a door for opening and closing the storage compartment; and a door opening and closing device for opening and closing the door.

[0013] The above door opening and closing device may include a driving unit that generates power, a power transmission unit that transmits power from the driving unit, a first operating unit that operates by receiving power from the driving unit, and a second operating unit that operates by receiving power from the driving unit and operates so that the door opens to a set angle.

[0014] The second operating unit may include a link gear that can be connected to the power transmission unit, and a link that has one side rotatably connected to the link gear and the other side rotatably connected to the door.

[0015] When the drive unit is operated for the automatic opening of the above door, the link gear may be rotated in the same direction as the opening direction of the above door.

[0016] When the door is closed, the center of rotation of the link with respect to the link gear may be located between the first operating part and the center of rotation of the link gear.

[0017] When the door is closed, a line perpendicular to the rear of the door while passing through the center of rotation of the link gear is defined as a virtual line, and the virtual line may be located between the center of rotation of the door and the center of rotation of the link relative to the link gear.

[0018] When the door is closed, if a line perpendicular to the rear of the door while passing through the center of rotation of the link gear is defined as a virtual line, the link may overlap with the virtual line in the vertical direction.

[0019] The distance between the center of rotation of the link gear and the center of rotation of the link relative to the link gear may be shorter than the distance from the center of rotation of the link gear to the gear tooth of the link gear.

[0020] The above link gear can be formed in a fan shape.

[0021] When the door is closed, the gear that can be connected to the link gear may be located between the first operating part and the rotation center of the link gear.

[0022] When the door is closed, the gear that can be connected to the link gear may be located between the first operating part and the center of rotation of the link relative to the link gear.

[0023] When the door is closed, the distance between the rear of the door and the gear that can be connected to the link gear may be smaller than the distance between the rear of the door and the center of rotation of the link relative to the link gear.

[0024] When the door is closed, the distance between the rear of the door and the gear that can be connected to the link gear may be smaller than the distance between the rear of the door and the center of rotation of the link gear.

[0025] The distance between the center of rotation of the link gear and the center of rotation of the link relative to the link gear may be greater than the distance from the center of rotation of the link gear to the gear tooth of the link gear.

[0026] When the door is closed, the distance from the rear of the door to the center of rotation of the link with respect to the link gear may be greater than the distance from the rear of the door to the center of rotation of the link gear.

[0027] When the door is closed, the distance from the rear of the door to the gear that can be connected to the link gear may be greater than the distance from the rear of the door to the center of rotation of the link relative to the link gear.

[0028] When the door is closed, the distance from the rear of the door to the gear that can be connected to the link gear may be greater than the distance from the rear of the door to the center of rotation of the link gear.

[0029] When the door is closed, the minimum distance between a point on the link and the first operating part may be smaller than the minimum distance between the center of rotation of the link with respect to the link gear and the first operating part.

[0030] One point of the above link may be located closer to the center of rotation of the link with respect to the link gear than to the center of rotation of the link with respect to the door.

[0031] When the above door is closed, a line perpendicular to the rear of the door while passing through the rotational center of the above link gear is defined as a virtual line, and the virtual line may overlap in the vertical direction with a gear that can be connected to the above link gear.

[0032] A refrigerator according to another aspect comprises: a cabinet having a storage compartment; a door for opening and closing the storage compartment; and a door opening and closing device for opening the door, wherein the door opening and closing device comprises a driving unit that generates power, a power transmission unit that transmits power from the driving unit, a first operating unit that operates by receiving power from the driving unit, and a second operating unit that operates by receiving power from the driving unit and operates so that the door is opened to a set angle, wherein the second operating unit comprises a link gear that can be connected to the power transmission unit, and a link that has one side rotatably connected to the link gear and the other side rotatably connected to the door, wherein when the door is closed, the center of rotation of the link relative to the link gear may be located between the first operating unit and the center of rotation of the link gear.

[0033] A refrigerator according to another aspect comprises: a cabinet having a storage compartment; a door for opening and closing the storage compartment; and a door opening and closing device for opening the door, wherein the door opening and closing device comprises a driving unit that generates power, a power transmission unit that transmits power from the driving unit, a first operating unit that operates by receiving power from the driving unit, and a second operating unit that operates by receiving power from the driving unit and operates so that the door is opened to a set angle, wherein the second operating unit comprises a link gear that can be connected to the power transmission unit, and a link whose one end is rotatably connected to the link gear and whose other end is rotatably connected to the door, wherein when the door is closed, a line perpendicular to the rear surface of the door passing through the center of rotation of the link gear is defined as a virtual line, and the virtual line may be located between the center of rotation of the door and the center of rotation of the link relative to the link gear.

[0034] According to one embodiment, there is an advantage that the opening angle of the door increases when the door is automatically opened.

[0035] According to one embodiment, there is an advantage that the door can not only be opened automatically but also closed automatically.

[0036] According to one embodiment, there is an advantage that the door can be opened automatically, as well as manually by the user.

[0037] FIG. 1 (a) is a plan view of a refrigerator according to a first embodiment, and FIG. 1 (b) is a drawing showing the state in which the cover member is removed from FIG. 1 (a).

[0038] FIG. 2(a) is a drawing showing a state in which a door opening / closing device and a cover member are separated from a refrigerator according to a first embodiment. FIG. 2(b) is a drawing showing a state in which a door opening / closing device and a cover member are mounted on a refrigerator according to a first embodiment.

[0039] FIG. 3 is a perspective view of a refrigerator showing the state in which the second frame is removed from the door opening and closing device installed in the refrigerator according to the first embodiment.

[0040] FIG. 4 is a perspective view of a door opening and closing device according to a first embodiment.

[0041] FIG. 5 is a control block diagram of a refrigerator according to a first embodiment.

[0042] FIGS. 6 to 10 are drawings showing the process of a door opening automatically.

[0043] FIGS. 11 to 14 are drawings showing the process of a door closing automatically.

[0044] FIGS. 15 and FIGS. 16 are drawings showing the process of opening a door manually.

[0045] FIG. 17 is a perspective view showing a door opening and closing device according to a second embodiment.

[0046] FIG. 18 is a plan view showing a door opening and closing device according to a second embodiment.

[0047] FIG. 19 is a drawing showing a door opening and closing device in a closed state according to a second embodiment.

[0048] FIGS. 20 to 24 are drawings showing the process of a door being automatically opened according to a second embodiment.

[0049] FIGS. 25 to 27 are drawings showing the process of a door automatically closing according to a second embodiment.

[0050] FIGS. 28 and 29 are drawings showing the process of opening a door manually.

[0051] FIG. 30 is a perspective view showing a door opening and closing device according to a third embodiment.

[0052] FIG. 31 is a plan view showing a door opening and closing device according to a third embodiment.

[0053] FIG. 32 is a drawing showing a door opening and closing device in a closed state according to a second embodiment.

[0054] FIGS. 33 to 37 are drawings showing the process of a door being automatically opened according to a third embodiment.

[0055] FIGS. 38 to 40 are drawings showing the process of a door automatically closing according to a third embodiment.

[0056] FIGS. 41 and FIGS. 42 are drawings showing the process of opening a door manually.

[0057] Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted.

[0058] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are intended only to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms. Where it is stated that a component is "connected," "combined," or "connected" to another component, it should be understood that the component may be directly connected, combined, or connected to the other component, but that another component may also be "connected," "combined," or "connected" between each component.

[0059] In this specification, at least one of component A and component B may be interpreted as comprising component A, component B, or component A+B.

[0060] Additionally, at least one of component A or component B may be interpreted as including component A, component B, or component A+B.

[0061] In this specification, the front of the door is the surface forming the front exterior of the door, and the rear of the door is the surface facing the cabinet or storage room.

[0062] FIG. 1 (a) is a plan view of a refrigerator according to a first embodiment, and FIG. 1 (b) is a drawing showing the state in which the cover member is removed from FIG. 1 (a).

[0063] FIG. 2(a) is a drawing showing the state in which the door opening / closing device and the cover member are separated from the refrigerator according to the first embodiment. FIG. 2(b) is a drawing showing the state in which the door opening / closing device and the cover member are mounted on the refrigerator according to the first embodiment.

[0064] Referring to FIGS. 1 and 2, a refrigerator (1) according to the present embodiment may include a cabinet (10) forming a storage room (12) and a door (20) for opening and closing the storage room (12).

[0065] The storage room (12) may include, for example, a refrigerator room. Or, the storage room (12) may include, for example, a freezer room. Or, although not illustrated, the storage room (12) may include additional storage rooms.

[0066] The door (20) may be a refrigerator door or a freezer door. The door (20) may include a first door (21) that opens and closes a part of the storage room (12). The door (20) may further include a second door (22) that opens and closes another part of the storage room (12). Alternatively, a single door (20) may open and close a single storage room (12) or open and close multiple storage rooms (12) simultaneously.

[0067] Each of the first door (21) and the second door (22) may be composed of a single door. Alternatively, one or more of the first door (21) and the second door (22) may include a main door and a sub door.

[0068] The refrigerator of the present embodiment may further include a door opening / closing device (30, 31) for opening the door (20). If the door (20) includes a plurality of doors (21, 22), the door opening / closing device (30, 31) may open some or all of the plurality of doors (21, 22). If the refrigerator (1) includes a single door (20), the refrigerator (1) may include a single door opening / closing device.

[0069] FIG. 1 illustrates, for example, that the first door (21) and the second door (22) are each automatically opened and closed by door opening and closing devices (30, 31). That is, the refrigerator (1) may include a first door opening and closing device (30) and a second door opening and closing device (31).

[0070] Each door opening / closing device (30, 31) is arranged in a symmetrical shape, and the structure may be the same.

[0071] Each of the first door (21) and the second door (22) can be rotatably connected to the cabinet (10) by a hinge mechanism (120). The hinge mechanism (120) can be covered by a hinge cover (130).

[0072] The hinge mechanism (120) may be installed, for example, on the upper surface of the cabinet (10). Accordingly, a pair of hinge mechanisms (120) may be spaced apart and arranged on the upper surface of the cabinet (10).

[0073] The hinge mechanism (120) may include a pin unit. The pin unit may include a plurality of spaced-apart pins. When the pin unit includes a plurality of pins, the center of rotation of the door (20) may move during the opening and closing process of the door (20).

[0074] As another example, the pin unit may include a single pin. If the pin unit includes a single pin, the rotation center of the door (20) may be fixed in position during the opening and closing process of the door (20).

[0075] As another example, a multi-joint hinge unit including a plurality of bodies may be used as the hinge mechanism (120).

[0076] Each of the above door opening / closing devices (30, 31) may be located on the upper side of the cabinet (10). Each of the above door opening / closing devices (30, 31) may be located adjacent to the hinge mechanism (120) between the pair of hinge mechanisms (120).

[0077] As another example, the door opening / closing device (30, 31) may be located on the lower side or on the side of the cabinet (10). Alternatively, the door opening / closing device (30, 31) may be housed within the cabinet (10), and a structure for opening the door may protrude outside the cabinet (10).

[0078] The refrigerator (1) may further include a cover member (110). The cover member (110) may be installed on the upper surface of the cabinet (10).

[0079] The cover member (110) can cover at least a portion of each door opening / closing device (30, 31). The cover member (110) can cover at least a portion of the hinge mechanism (120). The cover member (110) can cover at least a portion of the hinge cover (130).

[0080] Each of the above door opening / closing devices (30, 31) may be installed on the upper surface of the cabinet (10) or on the cover member (110). When each of the above door opening / closing devices (30, 31) is installed on the cover member (110), the cover member (110) may be installed on the upper surface of the cabinet (10) after each of the above door opening / closing devices (30, 31) is installed on the cover member (110).

[0081] In the present embodiment, a single cover member (110) may simultaneously cover a pair of door opening / closing devices (30, 31) and a pair of hinge covers (130), but is not limited thereto. For example, it is also possible for multiple cover members (110) to individually cover each of a pair of door opening / closing devices (30, 31) and a pair of hinge covers (130). Alternatively, it is also possible for the cover member (110) not to cover the pair of door opening / closing devices (30, 31).

[0082] Below, the door opening and closing device (30, 31) will be described in detail. At this time, the door opening and closing device (30, 31) will be collectively referred to as the "door opening and closing device (30)".

[0083] FIG. 3 is a perspective view of a refrigerator showing a state in which the second frame is removed from a door opening and closing device installed in a refrigerator according to a first embodiment, and FIG. 4 is a perspective view of a door opening and closing device according to a first embodiment.

[0084] In Fig. 3, the cover member was removed. In Fig. 4, part of the frame was removed.

[0085] Referring to FIGS. 3 and 4, in the case of the present embodiment, the door (20) can be automatically opened by the door opening / closing device (30). In addition, the door (20) can be opened manually by a user.

[0086] A part of the door opening / closing device (30) may be connected to the upper (or lower) side of the door (20).

[0087] A gasket (220) that limits cold air leakage of the storage room (12) may be provided between the door (20) and the cabinet (10). For example, the gasket (220) may be attached to the door (20). A magnet may be provided inside the gasket (220). The gasket (220) may be maintained in contact with the cabinet (10) by means of the magnet.

[0088] The door (20) may be rotatably connected to the cabinet (10) by a hinge mechanism (120). The door (20) may include a hinge mounting portion (210). The hinge mounting portion (210) may be formed by the rear surface of the door (20) being recessed toward the front. Alternatively, the hinge mounting portion (210) may be formed by one of the two sides of the door (20) being recessed toward the other side.

[0089] The hinge mechanism (120) may be installed on the bottom of the hinge mounting portion (210). The hinge mounting portion (210) may have a pin slot formed therein for receiving the pin unit, or a guide member forming the pin slot may be provided. If the pin unit includes a plurality of pins, the guide member may include a plurality of pin slots or a single pin slot.

[0090] The door opening / closing device (30) of the present embodiment may include a driving unit (302). The driving unit (302) may include, for example, a motor capable of rotating in both directions. The driving unit (302) may be controlled by a driving unit PCB (304).

[0091] The above door opening / closing device (30) may further include a power transmission unit (350) for transmitting power from the driving unit (302).

[0092] The above door opening / closing device (30) may further include a first operating part (330) (or a first door opening part) that operates by receiving power from the power transmission part (350).

[0093] The above door opening / closing device (30) may further include a second operating part (400) (or a second door opening part) that operates by receiving power from the power transmission part (350).

[0094] In the process of automatically opening the door (20), the first operating part (330) and the second operating part (400) can operate sequentially. In the process of automatically closing the door, the second operating part (400) acts as a door closing part that causes the door to close.

[0095] The above power transmission unit (350) may include a plurality of gears.

[0096] The door opening / closing device (30) may further include a frame (310). A plurality of gears may be rotatably supported on the frame (310). The frame (310) may cover or support at least a portion of the components constituting the door opening / closing device (30). The frame may be composed of a combination of at least two frames.

[0097] For example, the plurality of gears may include first to sixth gears (351, 352, 353, 354, 355, 356).

[0098] However, it should be noted that there is no limit to the number of gears in this embodiment. Additionally, it should be noted that there is no limit to the shape of the gears.

[0099] The first gear (351) may be connected to the shaft of the drive unit (302). The second to sixth gears (352 to 356) may be reduction gears. The second gear (352) may be connected to the first gear (351). The second to sixth gears (352 to 356) may be connected sequentially.

[0100] The fifth gear (355) can transmit power to the first operating part (330). Therefore, the fifth gear (355) can be named the first transmission gear or the first transmission part.

[0101] The sixth gear (356) can transmit power to the second operating part (400). Therefore, the sixth gear (356) can be named the second transmission gear or the second transmission part.

[0102] One or more of the above second to sixth gears (352 to 356) may be two-stage gears having parts with different diameters.

[0103] The fifth gear (355) can transmit power to the first operating unit (330) during some sections of the automatic opening process of the door (20). For example, the fifth gear (355) can transmit power to the first operating unit (330) during the initial section of the automatic opening process. The fifth gear (355) can block power transmission to the first operating unit (330) during other sections of the automatic opening process. That is, the fifth gear (355) can block power transmitted to the first operating unit (330) during the rotation process.

[0104] The fifth gear (355) may include a first part (355a) and a second part (355b). The diameter of the first part (355a) may be larger than the diameter of the second part (355b). Gear teeth may be formed entirely around the circumference of the first part (355a). The first part (355a) may mesh with the fourth gear (354). Gear teeth may be formed only on a portion of the circumference of the second part (355b). That is, the fifth gear (355) may include partial gears.

[0105] The second part (355b) may optionally be connected to the first operating part (330). When the second part (355b) is connected to the first operating part (330), the rotational force of the fifth gear (355) may be transmitted to the first operating part (330).

[0106] The sixth gear (356) can transmit power received from the fifth gear (355) to the link gear (360) to be described later. At this time, the sixth gear (356) may be designed so that the timing of receiving power from the fifth gear (355) and the timing of transmitting power to the link gear (360) are different.

[0107] The sixth gear (356) may include a first part (356a) and a second part (356b). The diameter of the first part (356a) may be different from the diameter of the second part (356b). Gear teeth may be formed entirely around the circumference of the first part (356a). The first part (356a) may mesh with the fifth gear (355). Gear teeth may be formed only on a portion of the circumference of the second part (356b). That is, the sixth gear (356) may include partial gears.

[0108] The first operating part (330) can receive power from the driving part (302) while connected to the fifth gear (355).

[0109] The first operating part (330) may be installed to be movable in the first axial direction on the frame (310). The first axial direction may be, for example, the arrangement direction of the door (20) and the cabinet (10) or the front-rear direction of the refrigerator (1).

[0110] The first operating unit (330) can receive power from the driving unit (302) during the initial section of the automatic opening process and act to separate the gasket (220) from the cabinet (10). Therefore, the first operating unit (330) can also be referred to as a gasket separation unit.

[0111] The first operating part (330) may include a first member (331). The first member (331) may be optionally connected to the fifth gear (355). The first member (331) may be referred to as a rack. The first member (331) may include a rack gear for connecting to the fifth gear (355).

[0112] The first operating part (330) may further include a second member (340). The second member (340) may push the door (20) during the automatic opening process of the door (20). The second member (340) may be called a pusher.

[0113] The first member (331) and the second member (340) may be arranged in the first axis direction. The first member (331) and the second member (340) may be arranged in a straight line, for example. Alternatively, it is possible for a part of the first member (331) to be arranged in a second axis direction that intersects the second member (340) and the first axis direction.

[0114] The first operating part (330) may further include a cover (349) coupled to the second member (340). The cover (349) may be formed of a material different from that of the second member (340). The cover (349) may be formed of a soft material or a flexible material. The cover (349) may come into contact with the door (20) during the operation of the first operating part (330). The cover (349) may reduce damage to the door (20) and noise caused by friction with the door (20). As another example, it is also possible for a part of the second member (340) to be formed of a soft material or a flexible material.

[0115] The door opening / closing device (30) may further include a first elastic member (370). The first elastic member (370) may connect the second member (340) and the frame (310).

[0116] The door opening / closing device (30) may further include a second elastic member (372). The second elastic member (372) may connect the first member (331) and the second member (340). The second elastic member (372) may act to cause the first member (331) and the second member (340) to move together during the automatic opening process of the door (20).

[0117] Unless an external force is applied, the first member (331) and the second member (340) can be in contact by the second elastic member (372). During the automatic opening process of the door (20), the first member (331) and the second member (340) can move while in contact.

[0118] The first elastic member (370) may be a coil spring. The second elastic member (372) may be a coil spring. The length of the first elastic member (370) may be the same as or different from the length of the second elastic member (372). Since the travel distance of the first operating part (330) during the automatic opening process is greater than the travel distance of the first member (331) during the automatic closing process, the length of the first elastic member (370) may be greater than the length of the second elastic member (372).

[0119] As another example, one or more of the first elastic member (370) and the second elastic member (372) may be in the form of a torsion spring or a leaf spring.

[0120] The second operating part (400) may include a link gear (360). The link gear (360) may be optionally connected to the sixth gear (356).

[0121] The second operating part (400) may include a link (410). The link (410) may be connected to the link gear (360). For example, the link (410) may be connected to the link gear (360) so as to be rotatable relative to it. At least a portion of the link (410) may be rounded. That is, the link (410) may include a curved portion. Alternatively, it is possible for the link (410) to include a straight portion.

[0122] The above link gear (360) may be, for example, a fan gear. The above link (410) may be rotatably connected to the link gear (360) at a position spaced apart from the rotation center (C3) of the link gear (360).

[0123] A receiving groove (365) may be formed on one side of the link gear (360) to receive one end of the link (410). When one end of the link (410) is received in the receiving groove (365), the one end of the link (410) may be rotatably connected to the link gear (360) by a first pin (421).

[0124] When the door (20) is closed, the sixth gear (356) can be positioned between the first operating part (330) and the rotation center (C3) of the link gear (360).

[0125] When the door (20) is closed, the sixth gear (356) may be positioned between the first operating part (330) and the rotation center (C4) of one end of the link (410). The rotation center (C4) may be the rotation center of the link (410) relative to the link gear (360).

[0126] According to this arrangement, the link gear (360) can be rotated in the same direction as the opening direction of the door (20) during the automatic opening process of the door (20).

[0127] When the door (20) is closed, the rotation center (C4) of one end of the link (410) can be located between the rotation center (C3) of the link gear (360) and the sixth gear (356).

[0128] At this time, in order to prevent the link (410) from interfering with the sixth gear (356), the distance (D2) between the center of rotation (C3) of the link gear (360) and the center of rotation (C4) of one end of the link (410) may be shorter than the distance (D3) (or radius of the link gear) from the center of rotation (C3) of the link gear to the gear tooth (362) of the link gear (360).

[0129] When the door (20) is closed, the first part (356a) of the sixth gear (356) can overlap with the link gear (360) in the vertical direction.

[0130] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the sixth gear (356) may be smaller than the distance between the rear (20b) of the door (20) and the center of rotation (C4) of one end of the link (410).

[0131] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the sixth gear (356) may be smaller than the distance between the rear (20b) of the door (20) and the center of rotation (C3) of the link gear (360).

[0132] A virtual line (A1) perpendicular to the rear (20b) of the door (20) can be defined while passing through the rotation center (C3) of the link gear (360).

[0133] When the door (20) is closed, the second gear (352) can overlap with the virtual line (A1) in the vertical direction. Additionally, the driving unit (302) can overlap with the virtual line (A1) in the vertical direction.

[0134] Some of the gears constituting the power transmission unit may be located on one side of the virtual line (A1), and others may be located on the other side of the virtual line (A1). The first operating unit (330) may also be located on the other side of the virtual line (A1).

[0135] The other end of the above link (410) can be connected to the door (20) by a connecting mechanism (460).

[0136] The above connecting mechanism (460) may include a connecting body (461) that is connected to the door (20) by a connecting member. The above connecting mechanism (460) may further include a second pin (462) extending from the connecting body (461).

[0137] A portion of the second pin (462) may penetrate the link (410) at the lower side of the other end of the link (410).

[0138] A groove may be formed in the hinge mechanism (120) to prevent interference with the second pin (462).

[0139] When the door (20) is closed, the rotation center (C2) of the other end of the link (410) can be located between the virtual line (A1) and the rotation center (C1) of the door (20).

[0140] The above rotation center (C2) may be the rotation center of the link (410) with respect to the door (20).

[0141] Accordingly, when the door (20) is closed, the link (410) can overlap with the virtual line (A1) in the vertical direction.

[0142] In this embodiment, the distance (D1) (or first distance) between the rotation center (C1) of the door (20) and the rotation center (C2) of the other end of the link (410) may be the same as or similar to the distance (D2) (or second distance) between the rotation center (C3) of the link gear (360) and the rotation center (C4) of one end of the link (410).

[0143] If the distance (D2) between the rotation center (C3) of the link gear (360) and the rotation center (C4) of one end of the link (410) is reduced, the torque of the link gear (360) can be reduced, but the rotation angle at which the link gear (360) must rotate can be increased.

[0144] When the rotation angle of the above link gear (360) increases, a structural design is required to prevent interference with surrounding structures during the rotation of the above link gear (360).

[0145] Therefore, it is desirable that the first distance (D1) and the second distance (D2) be the same or similar as much as possible.

[0146] Meanwhile, since the 6th gear (356) includes a partial gear, the rotation angle of the link gear (360) may be smaller than the maximum opening angle of the door (20) during the automatic opening process of the door (20).

[0147] Below, the process of opening and closing the above door will be explained.

[0148] FIG. 5 is a control block diagram of a refrigerator according to a first embodiment, FIG. 6 to 10 are drawings showing the process of a door being automatically opened, and FIG. 11 to 14 are drawings showing the process of a door being automatically closed.

[0149] Referring to FIGS. 7 through 14, the refrigerator of the present embodiment may further include a control unit (500). The control unit (500) may be installed on or spaced apart from the object to be controlled. The control unit (500) may be located inside or outside the object to be controlled.

[0150] For example, the control unit (500) may be provided in the cabinet (10) or in the door (20). The control unit (500) may also receive a door opening command from a remote device, such as a mobile phone, through a communication unit.

[0151] The control unit (500) can control the drive unit (302). The control unit (500) may be located outside the drive unit (302). The control unit (500) may control the drive unit (302) independently, and may also control other components in the refrigerator other than the drive unit (302).

[0152] The above refrigerator (1) may further include an input unit (502). The input unit (502) can input a door opening command for opening the door (20).

[0153] The input unit (502) may include a touch sensor that detects a user's touch on the front of the door (20), or a knock sensor that detects multiple knocks applied to the front of the door (20). Alternatively, the input unit (502) may include a capacitive sensor, a vibration-sensing sensor, or a sound wave-sensing sensor. Alternatively, the input unit (502) may include a mechanical button or a touch screen capable of inputting user commands. Since the input unit (502) can input commands and detect user commands, the input unit (502) may also be referred to as an input detection unit.

[0154] The input unit (502) may be provided in the cabinet (10) or in the door (20).

[0155] The refrigerator (1) may further include a sensor unit (504). The sensor unit (504) may detect the opening and closing of the door (20). The sensor unit (504) may be provided in the cabinet (10) or in the door (20).

[0156] The operation of the drive unit (302) for automatic opening of the door (20) can be performed when the door (20) is closed. That is, when the door (20) is detected to be closed by the sensor unit (504) and an automatic opening command for the door (20) is input, the drive unit (302) can be operated.

[0157] With the door (20) closed, the first operating part (330) and the second operating part (400) can be positioned in the initial position as shown in FIG. 6.

[0158] At the initial position of the first operating part (330), the first operating part (330) may be spaced apart from the rear surface (20b) of the door (20).

[0159] [Automatic Door Opening and Closing Process]

[0160] When the above door (20) is closed, a door opening command may be input from the input unit (502). The control unit (500) may detect or recognize the door opening signal.

[0161] Then, the control unit (500) can control the drive unit (302) for automatic opening of the door (20). For example, the drive unit (302) can operate in the forward direction.

[0162] Referring to FIG. 6, the control unit (500) can, for example, rotate the motor in the forward direction. When the motor is rotated in the forward direction, the power of the motor can be transmitted to the first operating unit (330) by the power transmission unit (350).

[0163] At the initial position of the first operating part (330) or the initial position of the fifth gear (355), the fifth gear (355) and the first operating part (330) are in a disconnected state.

[0164] At the initial position of the 6th gear (356), the 6th gear (356) is disconnected from the link gear (360).

[0165] During the process of the fifth gear (355) rotating, the second part (355b) of the fifth gear (355) and the first operating part (330) become connected. In this state, when the fifth gear (355) is further rotated, the first operating part (330) moves from the initial position toward the final position in the first direction (or forward direction or door opening direction).

[0166] Since the first member (331) and the second member (340) are connected by the second elastic member (372), when the first member (331) moves in the first direction due to the rotation of the fifth gear (355), the second member (340) can also move in the first direction.

[0167] As shown in FIG. 6, when the first operating part (330) moves in the first direction, the first operating part (330) comes into contact with the rear surface (20b) of the door (20). Even when the first operating part (330) is in contact with the rear surface (20b) of the door (20), the second operating part (400) remains in a stationary state. That is, when the fifth gear (355) rotates, the sixth gear (356) also rotates, but the second part (356b) of the sixth gear (356) is not yet connected to the link gear (360).

[0168] As shown in FIG. 7, when the first operating part (330) moves further in the first direction, the first operating part (330) pushes the door (20) so that the door (20) automatically rotates in the opening direction. Accordingly, at least a portion of the gasket (220) begins to be separated from the cabinet (10).

[0169] As shown in FIG. 7, when the second part (356b) of the sixth gear (356) is connected to the link gear (360) by the additional rotation of the sixth gear (356), the link gear (360) can be rotated.

[0170] After the door (20) starts to open from a closed state, until the sixth gear part (356) and the link gear (360) are rotated together, the link gear (360) can be rotated by the rotational force of the door (20) rotated by the first operating part (330).

[0171] As described above, the link gear (360) can be rotated in the same direction as the opening direction of the door (20).

[0172] When the link gear (360) is rotated, the link (410) can move from the initial position toward the door opening position. During the movement of the link (410), the door (20) can be automatically opened by the link (410).

[0173] As the link (410) moves while the first operating part (330) is in contact with the rear side (20b) of the door (20) and moves further in the first direction, as shown in FIG. 8, the door (20) is rotated by the link (410) so that the first operating part (330) can be separated from the rear side (20b) of the door (20).

[0174] In a state like that of FIG. 8, the first operating part (330) and the second operating part (400) operate together. For example, the first operating part (330) can move in the first direction, and the second operating part (400) can move in the opening direction.

[0175] That is, the automatic opening process of the door (20) may include a first opening section in which the first operating part (330) operates alone, and a second opening section in which the first operating part (330) and the second operating part (400) operate together.

[0176] As shown in Fig. 8, the opening angle of the door (20) is increased by the additional movement of the link (410), and the gasket (220) can be completely separated from the cabinet (10).

[0177] In this embodiment, the door opening / closing device (30) operates so that the gasket (220) is separated from the cabinet (10) at the beginning of the automatic opening of the door (20).

[0178] The second operating part (400) can be operated before the first operating part (330) is operated and the gasket (220) is completely separated from the cabinet (10).

[0179] Even when the first operating part (330) is spaced apart from the rear surface (20b) of the door (20), the first operating part (330) can move toward the final position in the first direction.

[0180] That is, the first operating part (330) can move in the first direction until it reaches the final position of FIG. 8 from the initial position of FIG. 3.

[0181] When the first operating part (330) reaches the final position, one side of the first operating part (330) comes into contact with the frame (310), and the movement of the first operating part (330) may be restricted.

[0182] The first elastic member (370) can be tensioned until the first operating part (330) reaches the final position from the initial position.

[0183] When the automatic opening of the door (20) begins and the fifth gear (355) is rotated beyond a predetermined angle, the fifth gear (355) and the first operating part (330) may be disconnected as shown in FIG. 9.

[0184] When the fifth gear (355) and the first operating part (330) are disconnected, the external force acting on the first operating part (330) is removed, so as shown in FIG. 9, the first operating part (330) can move in a second direction opposite to the first direction by the elastic force of the first elastic member (370). That is, the first operating part (330) can move from the final position to the second position in the initial position by the elastic force of the first elastic member (370).

[0185] When the first operating part (330) moves to the initial position, the other side of the first operating part (330) comes into contact with a part of the frame (310), and the movement of the first operating part (330) may be restricted.

[0186] Referring to FIG. 10, when the first operating part (330) is stopped, the second operating part (400) can continuously move in the opening direction.

[0187] Accordingly, the automatic opening process of the door (20) may further include a third opening section in which the second operating part (400) operates independently.

[0188] Referring to FIG. 10, when the second operating part (400) is continuously moved in the opening direction and moves to the door opening position, the opening angle of the door (20) becomes maximum. In this embodiment, the maximum opening angle (or set angle) of the door (20) may be greater than 90 degrees.

[0189] If the maximum opening angle of the door (20) is 90 degrees or more, there is an advantage that the user can easily access the storage room (12) without having to manually open the door (20) further.

[0190] The control unit (500) can determine whether the automatic opening of the door (20) is completed. If it is determined that the automatic opening of the door (20) is completed, the control unit (500) can stop the drive unit (302).

[0191] After the automatic opening of the door (20) is completed and the drive unit (302) is stopped, for the automatic closing of the door (20), if the door (20) is opened and a set time elapses, or if the door (20) is opened and no user is detected, or if a separate door closing command is input, or if a closing command of the door (20) is detected or recognized, the control unit (500) can cause the drive unit (302) to operate in the reverse direction. That is, the control unit (500) can control the motor to rotate in the reverse direction.

[0192] When the motor is rotated in the reverse direction, the power of the motor is transmitted to the second operating part (400) by the link gear (360), so that the second operating part (400) can move in the closing direction from the door open position to the initial position.

[0193] Since the fifth gear (355) and the first operating part (330) are disconnected during the process of opening the door (20), the first operating part (330) remains in a stopped state during some sections of the door closing process of the door (20).

[0194] Accordingly, the automatic closing process of the door (20) may include a first closing section in which only the second operating part (400) operates.

[0195] During the process in which the motor is rotated in the reverse direction, the fifth gear (355) is rotated in the reverse direction. During the process in which the fifth gear (355) is rotated in the reverse direction, the second part (355b) of the fifth gear (355) may come into contact with the rack gear of the first operating part (330).

[0196] Before the door (20) is completely closed, the second part (355b) of the fifth gear (355) may come into contact with the rack gear.

[0197] In this state, if the fifth gear (355) is additionally rotated in the reverse direction as shown in FIG. 13, the rotational force of the fifth gear (355) can be transmitted to the rack gear of the first operating part (330). Then, the first member (331) can move in the second direction while the second member (340) is stationary.

[0198] The door (20) can be completely closed as the first member (331) moves in the second direction.

[0199] Accordingly, the automatic closing process of the door (20) may include a second closing section in which the first operating part (330) and the second operating part (400) operate together.

[0200] When the first member (331) moves in the second direction, the first member (331) and the second member (340) may be separated by a predetermined distance. The predetermined distance may be the distance traveled by the first member (331).

[0201] After the first member (331) is separated from the second member (340), if the fifth gear (355) is further rotated in the reverse direction, the first operating part (330) and the fifth gear (355) may be disconnected. In this case, the first member (331) may return to its original position by the elastic force of the second elastic member (372). That is, the first member (331) may move in the first direction and come into contact with the second member (340).

[0202] After the first member (331) is separated, if the fifth gear (355) is further rotated in the reverse direction, the first operating part (330) and the fifth gear (355) can be reconnected. In this state, when the fifth gear (355) is rotated in the reverse direction, the first member (331) can be moved in the second direction and separated from the second member (340).

[0203] Since the number of gear teeth formed in the second part (355b) of the fifth gear (355) is multiple, the number of times the first member (331) returns to its original position after moving in the second direction may be equal to the number of gear teeth.

[0204] The process of the first member (331) moving in the second direction and then returning to the original position can be repeated until the fifth gear (355) moves to the initial position. When the fifth gear (355) has moved to the initial position, the fifth gear (355) can be disconnected from the first operating part (330).

[0205] The control unit (500) can stop the drive unit (302) when the stopping condition of the drive unit (302) is satisfied while the drive unit (302) is operating. For example, the drive unit (302) can be stopped when the fifth gear (355) has moved to an initial position.

[0206] As another example, it is also possible for the first member (331) and the second member (340) to be formed integrally. That is, if the first operating part (330) is designed so as not to interfere with the frame (310), the entire first operating part (330) can move in the second direction. In this case, the second elastic member (372) may be omitted.

[0207] According to the present embodiment, at the beginning of the automatic opening of the door, the power of the drive unit is transmitted to the first operating unit and used to separate the gasket, and during the process of separating the gasket or after separation, it is used as the opening force of the door. Therefore, there is an advantage that the gasket of the door can be easily separated at the beginning of the door opening. In addition, since the power of the drive unit is not directly transmitted to the link for door opening, the phenomenon of overloading the drive unit at the beginning of the door opening can be reduced.

[0208] In the case of this embodiment, the door is not only automatically opened but also automatically closed, so there is an advantage in that user convenience is improved.

[0209] [Manual Door Opening Process]

[0210] Figures 15 and 16 are drawings showing the process of opening a door manually.

[0211] Referring to FIGS. 14 to 16, the user can manually open the door (20) while the door (20) is closed.

[0212] As described above, when the door (20) is closed, the sixth gear (356) and the link gear (360) are disconnected, so even if the link gear (360) is rotated, the rotational force of the link gear (360) is not transmitted to the sixth gear (356). That is, the initial position of the sixth gear (356) may be the disconnected position.

[0213] When a user grasps the handle of the door (20) and pulls the door (20), the door can be rotated. When the door (20) is rotated in the opening direction, the second operating part (400) connected to the door (20) moves together with the door (20). During the manual opening process of the door (20), the second operating part (400) can move to the door opening position by the rotational force of the door (20).

[0214] When the second operating part (400) moves together with the door (20), the link gear (360) connected to the second operating part (400) rotates. However, since the sixth gear (356) is in the disconnected position, the sixth gear (356) does not rotate even when the link gear (360) rotates.

[0215] Therefore, during the manual opening process of the door (20), the manual rotational force of the door (20) is not transmitted to the sixth gear (356). The sixth gear (356) is connected to the drive unit (302) by the gears, but the rotational force of the door (20) is not transmitted to the drive unit (302). Therefore, it is possible to prevent a load from acting on the drive unit (302). In addition, since the rotational force of the door (20) is not transmitted to the first to sixth gears (351 to 356) during the manual opening process of the door (20), noise generated due to the rotation of the gears can be prevented.

[0216] Even when the user closes the door (20), the link gear (360) rotates, but the sixth gear (356) remains stationary.

[0217] FIG. 17 is a perspective view showing a door opening and closing device according to a second embodiment, and FIG. 18 is a plan view showing a door opening and closing device according to a second embodiment. FIG. 19 is a drawing showing a door opening and closing device in a closed state according to a second embodiment.

[0218] The basic operating principle of the door opening and closing device of this embodiment is the same as that of the first embodiment, except that there is a difference in the detailed structure of the door opening and closing device. Therefore, only the characteristic parts of this embodiment will be described below.

[0219] Referring to FIGS. 17 to 19, the door opening and closing device (60) of the present embodiment may include a driving unit (602). The driving unit (602) may include, for example, a motor capable of rotating in both directions.

[0220] The above door opening / closing device (60) may further include a power transmission unit (650) for transmitting power from the driving unit (602).

[0221] The above door opening / closing device (60) may further include a first operating part (630) (or a first door opening part) that operates by receiving power from the power transmission part (650).

[0222] The above door opening / closing device (60) may further include a second operating part (700) (or a second door opening part) that operates by receiving power from the power transmission part (650).

[0223] In the process of automatically opening the door (20), the first operating part (630) and the second operating part (700) can be operated sequentially.

[0224] The above power transmission unit (650) may include a plurality of gears.

[0225] The door opening / closing device (60) may further include a frame (610). A plurality of gears may be rotatably supported on the frame (610). The frame (610) may cover or support at least a portion of the components constituting the door opening / closing device (60). The frame may be composed of a combination of at least two frames.

[0226] For example, the plurality of gears may include first to sixth gears (651, 652, 653, 654, 655, 656). However, it should be noted that there is no limit to the number of gears in this embodiment. It should also be noted that there is no limit to the shape of the gears.

[0227] The first gear (651) may be connected to the shaft of the drive unit (602). The second to sixth gears (652 to 656) may be reduction gears. The second to sixth gears (652 to 656) may be connected sequentially.

[0228] The fifth gear (655) can transmit power to the first operating part (630). The sixth gear (656) can transmit power to the second operating part (700).

[0229] One or more of the above second to sixth gears (652 to 656) may be two-stage gears having parts with different diameters.

[0230] The fifth gear (655) can transmit power to the first operating unit (630) during some sections of the automatic opening process of the door (20). For example, the fifth gear (655) can transmit power to the first operating unit (630) during the initial section of the automatic opening process. The fifth gear (655) can block power transmission to the first operating unit (630) during other sections of the automatic opening process. That is, the fifth gear (655) can block power transmitted to the first operating unit (630) during the rotation process.

[0231] The fifth gear (655) may include a first part (655a) and a second part (655b). The diameter of the first part (655a) may be different from the diameter of the second part (655b). Gear teeth may be formed entirely around the circumference of the first part (655a). The first part (655a) may mesh with the fourth gear (654). Gear teeth may be formed only on a portion of the circumference of the second part (655b). That is, the fifth gear (655) may include partial gears.

[0232] The second part (655b) may optionally be connected to the first operating part (630). When the second part (655b) is connected to the first operating part (630), the rotational force of the fifth gear (655) may be transmitted to the first operating part (630).

[0233] The sixth gear (656) can transmit power received from the fifth gear (655) to the link gear (660) to be described later. At this time, the sixth gear (656) may be designed so that the timing of receiving power from the fifth gear (654) and the timing of transmitting power to the link gear (660) are different.

[0234] The sixth gear (656) may include a first part (656a) and a second part (656b). The diameter of the first part (656a) may differ from the diameter of the second part (656b). Gear teeth may be formed entirely around the circumference of the first part (656a). The first part (656a) may mesh with the fifth gear (655). Gear teeth may be formed only on a portion of the circumference of the second part (656b). That is, the sixth gear (656) may include partial gears.

[0235] The first operating unit (630) can receive power from the driving unit (602) while connected to the fifth gear (655).

[0236] The basic configuration and operation of the first operating part (630) above may be the same as the first operating part (330) of the first embodiment.

[0237] The first operating part (630) may include a first member (631). The first member (631) may be optionally connected to the fifth gear (655). The first member (631) may be referred to as a rack. The first member (631) may include a rack gear for connecting to the fifth gear (655).

[0238] The first operating part (630) may further include a second member (640). The second member (640) may push the door (20) during the automatic opening process of the door (20).

[0239] The first operating part (630) may further include a cover (649) coupled to the second member (640). The cover (649) may be formed of a material different from that of the second member (640). The cover (649) may be formed of a soft material or a flexible material.

[0240] The door opening / closing device (60) may further include a first elastic member (670). The door opening / closing device (60) may further include a second elastic member (672).

[0241] The shape, function, and operation of the first and second elastic members (670, 672) are the same as those of the first and second elastic members (370, 372) of the first embodiment, so a detailed description will be omitted.

[0242] The second operating part (700) may further include a link gear (660). The link gear (660) may optionally be connected to the sixth gear (656).

[0243] The second operating part (700) may include a link (710). The link (710) may be connected to the link gear (660). For example, the link (710) may be connected to the link gear (660) so as to be rotatable relative to it. At least a portion of the link (710) may be rounded. That is, the link (710) may include a curved portion. Alternatively, it is possible for the link (710) to include a straight portion.

[0244] The above link (710) can be rotatably connected to the link gear (660) at a position spaced apart from the rotation center (C3) of the link gear (660).

[0245] One end of the link (410) may be rotatably connected to the link gear (660) while positioned below the link gear (660). Of course, it is also possible for one end of the link (410) to be rotatably connected to the link gear (660) while positioned above the link gear (660).

[0246] When the door (20) is closed, the rotation center (C4) of one end of the link (710) can be positioned between the rotation center (C3) of the link gear (660) and the first operating part (630).

[0247] Accordingly, during the automatic opening process of the door (20), the rotation direction of the link gear (660) may be the same as the opening direction of the door (20).

[0248] The distance (D5) between the rotation center (C3) of the link gear (660) and the rotation center (C4) of one end of the link (710) may be greater than the distance (D4) from the rotation center (C3) of the link gear (660) to the gear tooth (662) of the link gear (660).

[0249] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the rotation center (C4) of one end of the link (710) may be greater than the distance between the rear (20b) of the door (20) and the rotation center (C3) of the link gear (660).

[0250] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the rotation center (C3) of the link gear (660) may be smaller than the distance between the rear (20b) of the door (20) and the fifth gear (655).

[0251] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the rotation center (C4) of one end of the link (710) may be smaller than the distance between the rear (20b) of the door (20) and the fifth gear (655).

[0252] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the rotation center (C3) of the link gear (660) may be smaller than the distance between the rear (20b) of the door (20) and the sixth gear (656).

[0253] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the rotation center (C4) of one end of the link (710) may be smaller than the distance between the rear (20b) of the door (20) and the sixth gear (656).

[0254] With the arrangement of these gears and the link (710), the width can be reduced relative to the length of the door opening / closing device (60).

[0255] When the door (20) is closed, the minimum distance (D7) between a point (711) of the link (710) and the first operating part (330) may be smaller than the minimum distance (D6) between the rotation center (C4) of one end of the link (710) and the first operating part (630). Thus, the left and right width of the door opening / closing device (60) can be reduced while preventing interference between the link (710) and the first operating part (630).

[0256] One point of the above link (710) may be located closer to the rotation center (C4) of one end of the link (710) than to the rotation center (C2) of the other end of the link (710).

[0257] A virtual line (A2) perpendicular to the rear (20b) of the door (20) can be defined while passing through the rotation center (C3) of the link gear (660).

[0258] When the door (20) is closed, a plurality of gears may overlap with the virtual line (A2) in the vertical direction. For example, the second gear (652) and the sixth gear (656) may overlap with the virtual line (A2) in the vertical direction, but are not limited thereto.

[0259] Some of the gears constituting the power transmission unit and the driving unit (602) may be located on one side of the virtual line (A2), and other parts may be located on the other side of the virtual line (A2). The first operating unit (630) may also be located on the other side of the virtual line (A2).

[0260] When the above door (20) is closed, the link (710) can overlap with the above virtual line (A2) in the vertical direction.

[0261] When the door (20) is closed, the rotation center (C2) of the other end of the link (710) may overlap with the virtual line (A2) in the vertical direction or be located close to the virtual line (A2).

[0262] The other end of the above link (710) can be connected to the door (20) by a connecting mechanism (760).

[0263] In this embodiment as well, since the sixth gear (656) includes a partial gear, the rotation angle of the link gear (660) may be smaller than the maximum opening angle of the door (20) during the automatic opening process of the door (20).

[0264] FIGS. 20 to 24 are drawings showing the process of a door being automatically opened according to a second embodiment, and FIGS. 25 to 27 are drawings showing the process of a door being automatically closed according to a second embodiment.

[0265] Referring to FIGS. 7, 19 to 27, when the door (20) is closed, a door opening command can be input from the input unit (502). The control unit (500) can detect or recognize the door opening signal.

[0266] Then, the control unit (500) can control the drive unit (602) for automatic opening of the door (20). For example, the drive unit (602) can operate in the forward direction.

[0267] Referring to FIG. 19, the control unit (500) can, for example, rotate the motor in the forward direction. When the motor is rotated in the forward direction, the power of the motor can be transmitted to the first operating unit (630) by the power transmission unit (650).

[0268] At the initial position of the first operating part (630) or the initial position of the fifth gear (655), the fifth gear (655) and the first operating part (630) are in a disconnected state.

[0269] At the initial position of the 6th gear (656), the 6th gear (656) is disconnected from the link gear (660).

[0270] During the process of the fifth gear (655) rotating, the second part (655b) of the fifth gear (655) and the first operating part (630) become connected. In this state, when the fifth gear (655) is further rotated, the first operating part (630) moves from the initial position toward the final position in the first direction (or forward direction or door opening direction).

[0271] Since the first member (631) and the second member (640) are connected by the second elastic member (672), the first member (631) and the second member (640) can move together in the first direction.

[0272] As shown in FIG. 20, when the first operating part (330) moves in the first direction, the first operating part (630) comes into contact with the rear surface (20b) of the door (20). Even when the first operating part (630) is in contact with the rear surface (20b) of the door (20), the second operating part (700) remains in a stationary state. That is, when the fifth gear (655) rotates, the sixth gear (656) also rotates, but the second part (656b) of the sixth gear (656) is not yet connected to the link gear (660).

[0273] As shown in FIG. 21, when the first operating part (630) moves further in the first direction, the first operating part (630) pushes the door (20) so that the door (20) automatically rotates in the opening direction. Accordingly, at least a portion of the gasket (220) begins to be separated from the cabinet (10).

[0274] As shown in FIG. 21, when the second part (656b) of the sixth gear (656) is connected to the link gear (660) by the additional rotation of the sixth gear (656), the link gear (660) can be rotated.

[0275] After the door (20) starts to open from a closed state, until the sixth gear part (656) and the link gear (360) are rotated together, the link gear (660) can be rotated by the rotational force of the door (20) rotated by the first operating part (630).

[0276] As described above, the link gear (660) can be rotated in the same direction as the opening direction of the door (20).

[0277] When the link gear (660) is rotated, the link (710) can move from the initial position toward the door opening position. During the movement of the link (710), the door (20) can be automatically opened by the link (710).

[0278] As the link (710) moves while the first operating part (630) is in contact with the rear side (20b) of the door (20) and moves further in the first direction, as shown in FIG. 22, the door (20) is rotated by the link (710) so that the first operating part (630) can be separated from the rear side (20b) of the door (20).

[0279] In a state like that shown in FIG. 22, the first operating part (630) and the second operating part (700) operate together. For example, the first operating part (630) can move in the first direction, and the second operating part (700) can move in the opening direction.

[0280] As shown in FIG. 22, the opening angle of the door (20) is increased by the additional movement of the link (710), and the gasket (220) can be completely separated from the cabinet (10).

[0281] Even when the first operating part (630) is spaced apart from the rear surface (20b) of the door (20), the first operating part (630) can move toward the final position in the first direction.

[0282] That is, the first operating part (630) can move in the first direction until it reaches the final position of FIG. 22 from the initial position of FIG. 19.

[0283] When the first operating part (630) reaches the final position, one side of the first operating part (630) comes into contact with the frame (610), and the movement of the first operating part (630) may be restricted.

[0284] The first elastic member (670) can be tensioned until the first operating part (630) reaches the final position from the initial position.

[0285] When the automatic opening of the door (20) begins and the fifth gear (655) is rotated beyond a predetermined angle, the fifth gear (655) and the first operating part (630) may be disconnected as shown in FIG. 23.

[0286] When the fifth gear (655) and the first operating part (630) are disconnected, the external force acting on the first operating part (630) is removed, so as shown in FIG. 23, the first operating part (630) can move in a second direction opposite to the first direction by the elastic force of the first elastic member (670). That is, the first operating part (630) can move from the final position to the second position in the initial position by the elastic force of the first elastic member (670).

[0287] When the first operating part (630) moves to the initial position, the other side of the first operating part (630) comes into contact with a part of the frame (610), and the movement of the first operating part (630) may be restricted.

[0288] Referring to FIG. 24, when the first operating part (630) is stopped, the second operating part (700) can continuously move in the opening direction.

[0289] Referring to FIG. 24, when the second operating part (700) is continuously moved in the opening direction and moves to the door opening position, the opening angle of the door (20) becomes maximum. In this embodiment, the maximum opening angle (or set angle) of the door (20) may be greater than 90 degrees.

[0290] If the maximum opening angle of the door (20) is 90 degrees or more, there is an advantage that the user can easily access the storage room (12) without having to manually open the door (20) further.

[0291] The control unit (500) can determine whether the automatic opening of the door (20) is completed. If it is determined that the automatic opening of the door (20) is completed, the control unit (500) can stop the drive unit (602).

[0292] After the automatic opening of the door (20) is completed and the drive unit (602) is stopped, for the automatic closing of the door (20), if the door (20) is opened and a set time elapses, or if the door (20) is opened and no user is detected, or if a separate door closing command is input, or if a closing command of the door (20) is detected or recognized, the control unit (500) can cause the drive unit (602) to operate in the reverse direction. That is, the control unit (500) can control the motor to rotate in the reverse direction.

[0293] When the motor is rotated in the reverse direction, the power of the motor is transmitted to the second operating part (700) by the link gear (660), so that the second operating part (700) can move in the closing direction from the door open position to the initial position.

[0294] Since the fifth gear (655) and the first operating part (630) are disconnected during the process of opening the door (20), the first operating part (630) remains in a stopped state during some sections of the door closing process of the door (20).

[0295] During the process in which the motor is rotated in the reverse direction, the fifth gear (655) is rotated in the reverse direction. During the process in which the fifth gear (655) is rotated in the reverse direction, the second part (655b) of the fifth gear (655) may come into contact with the rack gear of the first operating part (630).

[0296] Before the door (20) is completely closed, the second part (655b) of the fifth gear (655) may come into contact with the rack gear.

[0297] In this state, if the fifth gear (655) is additionally rotated in the reverse direction as shown in FIG. 27, the rotational force of the fifth gear (655) can be transmitted to the rack gear of the first operating part (630). Then, the first member (631) can move in the second direction while the second member (640) is stationary.

[0298] The door (20) can be completely closed as the first member (631) moves in the second direction.

[0299] When the first member (631) moves in the second direction, the first member (631) and the second member (640) may be separated by a predetermined distance.

[0300] After the first member (631) is separated from the second member (640), if the fifth gear (655) is further rotated in the reverse direction, the first operating part (630) and the fifth gear (655) may be disconnected. In this case, the first member (631) may return to its original position by the elastic force of the second elastic member (672). That is, the first member (631) may move in the first direction and come into contact with the second member (640).

[0301] After the first member (631) is separated, if the fifth gear (655) is further rotated in the reverse direction, the first operating part (630) and the fifth gear (655) can be reconnected. In this state, when the fifth gear (655) is rotated in the reverse direction, the first member (631) can be moved in the second direction and separated from the second member (640).

[0302] Since the number of gear teeth formed in the second part (655b) of the fifth gear (655) is multiple, the number of times the first member (631) returns to its original position after moving in the second direction may be equal to the number of gear teeth.

[0303] The process of the first member (631) moving in the second direction and then returning to the original position can be repeated until the fifth gear (655) moves to the initial position. When the fifth gear (655) has moved to the initial position, the fifth gear (655) can be disconnected from the first operating part (630).

[0304] The control unit (500) can stop the drive unit (602) when the stopping condition of the drive unit (602) is satisfied while the drive unit (602) is operating. For example, the drive unit (602) can be stopped when the fifth gear (655) has moved to an initial position.

[0305] As another example, it is also possible for the first member (631) and the second member (640) to be formed integrally. That is, if the first operating part (630) is designed so as not to interfere with the frame (610), the entire first operating part (630) can move in the second direction. In this case, the second elastic member (672) may be omitted.

[0306] [Manual Door Opening Process]

[0307] Figures 28 and 29 are drawings showing the process of opening a door manually.

[0308] Referring to FIGS. 28 and 29, the user can manually open the door (20) while it is closed.

[0309] As described above, when the door (20) is closed, the sixth gear (656) and the link gear (660) are disconnected, so even if the link gear (660) is rotated, the rotational force of the link gear (660) is not transmitted to the sixth gear (656). That is, the initial position of the sixth gear (656) may be the disconnected position.

[0310] When a user grasps the handle of the door (20) and pulls the door (20), the door can be rotated. When the door (20) is rotated in the opening direction, the second operating part (700) connected to the door (20) moves together with the door (20). During the manual opening process of the door (20), the second operating part (700) can move to the door opening position by the rotational force of the door (20).

[0311] When the second operating part (700) moves together with the door (20), the link gear (660) connected to the second operating part (700) rotates. However, since the sixth gear (656) is in the disconnected position, the sixth gear (656) does not rotate even when the link gear (660) rotates.

[0312] Therefore, during the manual opening process of the door (20), the manual rotational force of the door (20) is not transmitted to the sixth gear (656). The sixth gear (656) is connected to the drive unit (602) by the gears, but the rotational force of the door (20) is not transmitted to the drive unit (602). Therefore, it is possible to prevent a load from acting on the drive unit (602). In addition, since the rotational force of the door (20) is not transmitted to the first to sixth gears (651 to 656) during the manual opening process of the door (20), noise generated due to the rotation of the gears can be prevented.

[0313] Even when the user closes the door (20), the link gear (660) rotates, but the sixth gear (656) remains stationary.

[0314] FIG. 30 is a perspective view showing a door opening and closing device according to a third embodiment, and FIG. 31 is a plan view showing a door opening and closing device according to a third embodiment. FIG. 32 is a drawing showing a door opening and closing device in a closed state according to a second embodiment.

[0315] The basic operating principle of the door opening and closing device of this embodiment is the same as that of the first embodiment, except that there is a difference in the detailed structure of the door opening and closing device. Therefore, only the characteristic parts of this embodiment will be described below.

[0316] Referring to FIGS. 30 to 32, the door opening and closing device (80) of the present embodiment may include a driving unit (802). The driving unit (802) may include, for example, a motor capable of rotating in both directions.

[0317] The above door opening / closing device (80) may further include a power transmission unit (850) for transmitting power from the driving unit (802).

[0318] The above door opening / closing device (80) may further include a first operating unit (830) that operates by receiving power from the power transmission unit (850).

[0319] The above door opening / closing device (80) may further include a second operating unit (900) that operates by receiving power from the power transmission unit (850).

[0320] In the process of automatically opening the door (20), the first operating part (830) and the second operating part (900) can be operated sequentially.

[0321] The above power transmission unit (850) may include a plurality of gears.

[0322] The door opening / closing device (80) may further include a frame (810). A plurality of gears may be rotatably supported on the frame (810). The frame (810) may cover or support at least a portion of the components constituting the door opening / closing device (80). The frame may be composed of a combination of at least two frames.

[0323] For example, the plurality of gears may include first to sixth gears (851, 852, 853, 854, 855, 856). However, it should be noted that there is no limit to the number of gears in this embodiment. It should also be noted that there is no limit to the shape of the gears.

[0324] The first gear (851) may be connected to the shaft of the drive unit (802). The second to sixth gears (852 to 856) may be reduction gears. The second to sixth gears (852 to 856) may be connected sequentially.

[0325] The fifth gear (855) can transmit power to the first operating part (830). The sixth gear (856) can transmit power to the second operating part (900).

[0326] One or more of the above second to sixth gears (852 to 856) may be two-stage gears having parts with different diameters.

[0327] The fifth gear (855) may include a first part (855a) and a second part (855b). The diameter of the first part (855a) may differ from the diameter of the second part (855b). Gear teeth may be formed entirely around the circumference of the first part (855a). The first part (855a) may mesh with the fourth gear (854). Gear teeth may be formed only on a portion of the circumference of the second part (855b). That is, the fifth gear (855) may include partial gears.

[0328] The second part (855b) may optionally be connected to the first operating part (830). When the second part (855b) is connected to the first operating part (830), the rotational force of the fifth gear (855) may be transmitted to the first operating part (830).

[0329] The sixth gear (856) can transmit power received from the fifth gear (855) to the link gear (860) to be described later. At this time, the sixth gear (856) may be designed so that the timing of receiving power from the fifth gear (854) and the timing of transmitting power to the link gear (860) are different.

[0330] The sixth gear (856) may include a first part (856a) and a second part (856b). The diameter of the first part (856a) may differ from the diameter of the second part (856b). Gear teeth may be formed entirely around the circumference of the first part (856a). The first part (856a) may mesh with the fifth gear (855). Gear teeth may be formed only on a portion of the circumference of the second part (856b). That is, the sixth gear (856) may include partial gears.

[0331] The first operating unit (830) can receive power from the driving unit (802) while connected to the fifth gear (855).

[0332] The basic configuration and operation of the first operating part (830) above may be the same as the first operating part (330) of the first embodiment.

[0333] The first operating part (830) may include a first member (831). The first member (831) may be optionally connected to the fifth gear (855). The first member (831) may include a rack gear for connecting to the fifth gear (855).

[0334] The first operating part (830) may further include a second member (840).

[0335] The first operating part (830) may further include a cover (849) coupled to the second member (840). The cover (849) may be formed of a material different from that of the second member (840). The cover (849) may be formed of a soft material or a flexible material.

[0336] The door opening / closing device (80) may further include a first elastic member (870). The door opening / closing device (60) may further include a second elastic member (872).

[0337] The shape, function, and operation of the first and second elastic members (870, 872) are the same as those of the first and second elastic members (370, 372) of the first embodiment, so a detailed description will be omitted.

[0338] The second operating part (900) may further include a link gear (860). The link gear (860) may optionally be connected to the sixth gear (856).

[0339] The second operating part (900) may include a link (910). The link (910) may be connected to the link gear (860). For example, the link (910) may be connected to the link gear (860) so as to be rotatable relative to it. At least a portion of the link (910) may be rounded. That is, the link (910) may include a curved portion. Alternatively, it is possible for the link (910) to include a straight portion.

[0340] The above link (910) can be rotatably connected to the link gear (860) at a position spaced apart from the rotation center (C3) of the link gear (860).

[0341] One end of the above link (910) can be rotatably connected to the link gear (860) while positioned above the link gear (860).

[0342] When the door (20) is closed, the rotation center (C4) of one end of the link (910) can be positioned between the rotation center (C3) of the link gear (860) and the first operating part (830).

[0343] Accordingly, during the automatic opening process of the door (20), the rotational direction of the link gear (860) may be the same as the opening direction of the door (20).

[0344] The distance (D9) between the rotation center (C3) of the link gear (860) and the rotation center (C4) of one end of the link (910) may be greater than the distance (D8) from the rotation center (C3) of the link gear (860) to the gear tooth (862) of the link gear (860).

[0345] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the rotation center (C4) of one end of the link (910) may be greater than the distance between the rear (20b) of the door (20) and the rotation center (C3) of the link gear (860).

[0346] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the rotation center (C3) of the link gear (860) may be smaller than the distance between the rear (20b) of the door (20) and the fifth gear (855).

[0347] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the rotation center (C4) of one end of the link (910) may be smaller than the distance between the rear (20b) of the door (20) and the fifth gear (855).

[0348] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the rotation center (C3) of the link gear (860) may be smaller than the distance between the rear (20b) of the door (20) and the sixth gear (856).

[0349] When the door (20) is closed, the distance between the rear (20b) of the door (20) and the rotation center (C4) of one end of the link (910) may be smaller than the distance between the rear (20b) of the door (20) and the sixth gear (856).

[0350] With the arrangement of these gears and the link (910), the width can be reduced relative to the length of the door opening / closing device (60).

[0351] A virtual line (A3) perpendicular to the rear (20b) of the door (20) can be defined while passing through the rotation center (C3) of the link gear (860).

[0352] When the door (20) is closed, a plurality of gears may overlap with the virtual line (A3) in the vertical direction. For example, the second gear (852) and the sixth gear (856) may overlap with the virtual line (A3) in the vertical direction.

[0353] Some of the gears constituting the power transmission unit and the driving unit (802) may be located on one side of the virtual line (A3), and other parts may be located on the other side of the virtual line (A3). The first operating unit (830) may also be located on the other side of the virtual line (A3).

[0354] When the above door (20) is closed, the link (910) can overlap with the above virtual line (A3) in the vertical direction.

[0355] The virtual line (A3) can be positioned between the rotation center (C4) of one end of the link (910) and the rotation center (C2) of the other end of the link (710).

[0356] The other end of the above link (910) can be connected to the door (20) by a connecting mechanism (960).

[0357] In this embodiment as well, since the sixth gear (856) includes a partial gear, the rotation angle of the link gear (860) may be smaller than the maximum opening angle of the door (20) during the automatic opening process of the door (20).

[0358] FIGS. 33 to 37 are drawings showing the process of a door being automatically opened according to a third embodiment, and FIGS. 38 to 40 are drawings showing the process of a door being automatically closed according to a third embodiment.

[0359] Referring to FIGS. 5, 32 to 37, when the door (20) is closed, a door opening command can be input from the input unit (502). The control unit (500) can detect or recognize the door opening signal.

[0360] Then, the control unit (500) can control the drive unit (802) for automatic opening of the door (20). For example, the drive unit (802) can operate in the forward direction.

[0361] Referring to FIG. 32, the control unit (500) can, for example, rotate the motor in the forward direction. When the motor is rotated in the forward direction, the power of the motor can be transmitted to the first operating unit (830) by the power transmission unit (850).

[0362] At the initial position of the first operating part (830) or the initial position of the fifth gear (855), the fifth gear (855) and the first operating part (830) are in a disconnected state.

[0363] At the initial position of the 6th gear (856), the 6th gear (856) is disconnected from the link gear (860).

[0364] During the process of the fifth gear (855) rotating, the second part (855b) of the fifth gear (855) and the first operating part (830) become connected. In this state, when the fifth gear (855) is further rotated, the first operating part (830) moves from the initial position toward the final position in the first direction (or forward direction or door opening direction).

[0365] Since the first member (831) and the second member (840) are connected by the second elastic member (872), the first member (831) and the second member (840) can move together in the first direction.

[0366] As shown in FIG. 33, when the first operating part (830) moves in the first direction, the first operating part (830) comes into contact with the rear surface (20b) of the door (20). Even when the first operating part (830) is in contact with the rear surface (20b) of the door (20), the second operating part (900) remains in a stationary state. That is, when the fifth gear (855) rotates, the sixth gear (856) also rotates, but the second part (856b) of the sixth gear (856) is not yet connected to the link gear (860).

[0367] As shown in FIG. 34, when the first operating part (830) moves further in the first direction, the first operating part (830) pushes the door (20) so that the door (20) automatically rotates in the opening direction. Accordingly, at least a portion of the gasket (220) begins to be separated from the cabinet (10).

[0368] As shown in FIG. 34, when the second part (856b) of the sixth gear (856) is connected to the link gear (860) by the additional rotation of the sixth gear (856), the link gear (860) can be rotated.

[0369] After the door (20) starts to open from a closed state, until the sixth gear part (856) and the link gear (360) are rotated together, the link gear (860) can be rotated by the rotational force of the door (20) rotated by the first operating part (830).

[0370] As described above, the link gear (860) can be rotated in the same direction as the opening direction of the door (20).

[0371] When the link gear (860) is rotated, the link (910) can move from the initial position toward the door opening position. During the movement of the link (910), the door (20) can be automatically opened by the link (910).

[0372] As the link (910) moves while the first operating part (830) is in contact with the rear side (20b) of the door (20) and moves further in the first direction, as shown in FIG. 35, the door (20) is rotated by the link (910) so that the first operating part (830) can be separated from the rear side (20b) of the door (20).

[0373] In a state like that of FIG. 35, the first operating part (830) and the second operating part (900) operate together. For example, the first operating part (830) can move in the first direction, and the second operating part (900) can move in the opening direction.

[0374] As shown in FIG. 35, the opening angle of the door (20) is increased by the additional movement of the link (910), and the gasket (220) can be completely separated from the cabinet (10).

[0375] Even when the first operating part (830) is spaced apart from the rear surface (20b) of the door (20), the first operating part (830) can move toward the final position in the first direction.

[0376] That is, the first operating part (830) can move in the first direction until it reaches the final position of FIG. 35 from the initial position of FIG. 32.

[0377] When the first operating part (830) reaches the final position, one side of the first operating part (830) comes into contact with the frame (810), and the movement of the first operating part (830) may be restricted.

[0378] The first elastic member (870) can be tensioned until the first operating part (830) reaches the final position from the initial position.

[0379] When the automatic opening of the door (20) begins and the fifth gear (855) is rotated beyond a predetermined angle, the fifth gear (855) and the first operating part (830) may be disconnected as shown in FIG. 36.

[0380] When the fifth gear (855) and the first operating part (830) are disconnected, the external force acting on the first operating part (830) is removed, so as shown in FIG. 36, the first operating part (830) can move in a second direction opposite to the first direction by the elastic force of the first elastic member (870). That is, the first operating part (830) can move from the final position to the second position in the initial position by the elastic force of the first elastic member (870).

[0381] When the first operating part (830) moves to the initial position, the other side of the first operating part (830) comes into contact with a part of the frame (810), and the movement of the first operating part (830) may be restricted.

[0382] Referring to FIG. 37, when the first operating part (830) is stopped, the second operating part (900) can continuously move in the opening direction.

[0383] Referring to FIG. 37, when the second operating part (900) is continuously moved in the opening direction and moves to the door opening position, the opening angle of the door (20) becomes maximum. In this embodiment, the maximum opening angle (or set angle) of the door (20) may be greater than 90 degrees.

[0384] If the maximum opening angle of the door (20) is 90 degrees or more, there is an advantage that the user can easily access the storage room (12) without having to manually open the door (20) further.

[0385] The control unit (500) can determine whether the automatic opening of the door (20) is completed. If it is determined that the automatic opening of the door (20) is completed, the control unit (500) can stop the drive unit (802).

[0386] When the drive unit (802) is stopped after the automatic opening of the door (20) is completed, for the automatic closing of the door (20), if the door (20) is opened and a set time elapses, or if the door (20) is opened and no user is detected, or if a separate door closing command is input, or if a closing command of the door (20) is detected or recognized,

[0387] The control unit (500) can cause the drive unit (802) to operate in the reverse direction. That is, the control unit (500) can control the motor to rotate in the reverse direction.

[0388] When the motor is rotated in the reverse direction, the power of the motor is transmitted to the second operating part (900) by the link gear (860), so that the second operating part (900) can move in the closing direction from the door open position to the initial position.

[0389] Since the fifth gear (855) and the first operating part (830) are disconnected during the process of opening the door (20), the first operating part (830) remains in a stopped state during some sections of the door closing process of the door (20).

[0390] During the process in which the motor is rotated in the reverse direction, the fifth gear (855) is rotated in the reverse direction. During the process in which the fifth gear (855) is rotated in the reverse direction, the second part (855b) of the fifth gear (855) may come into contact with the rack gear of the first operating part (830).

[0391] Before the door (20) is completely closed, the second part (855b) of the fifth gear (855) may come into contact with the rack gear.

[0392] In this state, if the fifth gear (955) is additionally rotated in the reverse direction as shown in FIG. 40, the rotational force of the fifth gear (855) can be transmitted to the rack gear of the first operating part (830). Then, the first member (831) can move in the second direction while the second member (840) is stationary.

[0393] The door (20) can be completely closed as the first member (831) moves in the second direction.

[0394] When the first member (831) moves in the second direction, the first member (831) and the second member (840) may be separated by a predetermined distance.

[0395] After the first member (831) is separated from the second member (840), if the fifth gear (855) is further rotated in the reverse direction, the first operating part (830) and the fifth gear (855) may be disconnected. In this case, the first member (831) may return to its original position by the elastic force of the second elastic member (872). That is, the first member (831) may move in the first direction and come into contact with the second member (840).

[0396] After the first member (831) is separated, if the fifth gear (855) is further rotated in the reverse direction, the first operating part (830) and the fifth gear (855) can be reconnected. In this state, when the fifth gear (855) is rotated in the reverse direction, the first member (831) can be moved in the second direction and separated from the second member (840).

[0397] Since the number of gear teeth formed in the second part (855b) of the fifth gear (855) is multiple, the number of times the first member (831) returns to its original position after moving in the second direction may be equal to the number of gear teeth.

[0398] The process of the first member (831) moving in the second direction and then returning to the original position can be repeated until the fifth gear (855) moves to the initial position. When the fifth gear (855) has moved to the initial position, the fifth gear (855) can be disconnected from the first operating part (830).

[0399] The control unit (500) can stop the drive unit (802) when the stopping condition of the drive unit (802) is satisfied while the drive unit (802) is operating. For example, the drive unit (802) can be stopped when the fifth gear (855) has moved to an initial position.

[0400] As another example, it is also possible for the first member (831) and the second member (840) to be formed integrally. That is, if the first operating part (830) is designed so as not to interfere with the frame (810), the entire first operating part (830) can move in the second direction. In this case, the second elastic member (872) may be omitted.

[0401] [Manual Door Opening Process]

[0402] Figures 41 and 42 are drawings showing the process of opening a door manually.

[0403] Referring to FIGS. 41 and 42, the user can manually open the door (20) while it is closed.

[0404] As described above, when the door (20) is closed, the sixth gear (856) and the link gear (860) are disconnected, so even if the link gear (860) is rotated, the rotational force of the link gear (860) is not transmitted to the sixth gear (856). That is, the initial position of the sixth gear (856) may be the disconnected position.

[0405] When a user grasps the handle of the door (20) and pulls the door (20), the door can be rotated. When the door (20) is rotated in the opening direction, the second operating part (900) connected to the door (20) moves together with the door (20). During the manual opening process of the door (20), the second operating part (900) can move to the door opening position by the rotational force of the door (20).

[0406] When the second operating part (900) moves together with the door (20), the link gear (860) connected to the second operating part (900) rotates. However, since the sixth gear (856) is in the disconnected position, the sixth gear (856) does not rotate even when the link gear (860) rotates.

[0407] Therefore, during the manual opening process of the door (20), the manual rotational force of the door (20) is not transmitted to the sixth gear (856). The sixth gear (856) is connected to the drive unit (802) by the gears, but the rotational force of the door (20) is not transmitted to the drive unit (802). Therefore, it is possible to prevent a load from acting on the drive unit (802). In addition, since the rotational force of the door (20) is not transmitted to the first to sixth gears (851 to 856) during the manual opening process of the door (20), noise generated due to the rotation of the gears can be prevented.

[0408] Even when the user closes the door (20), the link gear (860) rotates, but the sixth gear (856) remains stationary.

Claims

Cabinet equipped with a storage room; A door for opening and closing the above storage room; and It includes a door opening and closing device for opening the above door, and The above door opening and closing device is, A drive unit that generates power, and A power transmission unit that transmits power to the above-mentioned drive unit, and A first operating unit that operates by receiving power from the above-mentioned driving unit, and It includes a second operating unit that receives power from the above-mentioned driving unit and operates to open the door to a set angle, The second operating unit above comprises a link gear that can be connected to the power transmission unit, and It includes a link, one side of which is rotatably connected to the link gear and the other side of which is rotatably connected to the door, A refrigerator in which the link gear rotates in the same direction as the opening direction of the door when the drive unit is operated for automatic opening of the door. In Article 1, With the above door closed, A refrigerator in which the rotational center of the link with respect to the link gear is located between the first operating part and the rotational center of the link gear. In Article 1, With the above door closed, When a line passing through the rotational center of the above link gear and perpendicular to the rear of the above door is defined as a virtual line, The above virtual line is a refrigerator located between the rotation center of the door and the rotation center of the link with respect to the link gear. In Article 1, With the above door closed, When a line passing through the rotational center of the above link gear and perpendicular to the rear of the above door is defined as a virtual line, The above virtual line overlaps with the above link in the vertical direction, or The above virtual line is a refrigerator that overlaps in the vertical direction with a gear that can be connected to the above link gear. In Article 1, The distance between the center of rotation of the above link gear and the center of rotation of the link with respect to the above link gear is, A refrigerator with a distance shorter than the distance from the center of rotation of the above link gear to the gear tooth of the above link gear. In Article 1, The above link gear is a refrigerator formed in a fan shape. In Article 1, With the above door closed, A gear that can be connected to the above link gear is a refrigerator located between the first operating part and the rotation center of the above link gear. In Article 7, With the above door closed, A gear that can be connected to the above link gear is a refrigerator located between the first operating part and the center of rotation of the link relative to the link gear. In Article 7, With the above door closed, The distance between the rear of the door and the gear that can be connected to the link gear is smaller than the distance between the rear of the door and the center of rotation of the link relative to the link gear, or A refrigerator in which the distance between the rear of the door and the gear that can be connected to the link gear is smaller than the distance between the rear of the door and the center of rotation of the link gear. In Article 1, The distance between the center of rotation of the above link gear and the center of rotation of the link with respect to the above link gear is, A refrigerator with a distance greater than the distance from the center of rotation of the link gear to the gear tooth of the link gear. In Article 1, With the above door closed, The distance from the rear of the above door to the center of rotation of the link with respect to the link gear is, A refrigerator with a distance greater than the center of rotation of the link gear from the rear of the above door. In Article 11, With the above door closed, The distance from the rear of the above door to the gear that can be connected to the above link gear is A refrigerator with a distance greater than the center of rotation of the link relative to the link gear from the rear of the above door. In Article 11, With the above door closed, The distance from the rear of the above door to the gear that can be connected to the above link gear is A refrigerator with a distance greater than the center of rotation of the link gear from the rear of the above door. In Article 11, With the above door closed, A refrigerator in which the minimum distance between a point of the above link and the first operating part is smaller than the minimum distance between the center of rotation of the link with respect to the link gear and the first operating part. In Article 14, A refrigerator in which one point of the above link is located closer to the center of rotation of the link with respect to the link gear than to the center of rotation of the above link with respect to the door.

Images