WO2006090958A1

WO2006090958A1 - Door opening and closing apparatus for re¬ frigerator

Info

Publication number: WO2006090958A1
Application number: PCT/KR2005/002685
Authority: WO
Inventors: Joon Hwan Oh; Seong Jae Kim; Ki Chul Woo; Jang Ho Shim; Seung Yup Kim; Jong Ho Hong; Sang Yeul Lee
Original assignee: Lg Electronics Inc.
Priority date: 2005-02-28
Filing date: 2005-08-17
Publication date: 2006-08-31
Also published as: KR100707435B1; EP1856464A1; KR20060095418A

Abstract

There is provided a door opening and closing apparatus of a refrigerator. The door opening and closing apparatus includes a plurality of doors for opening and closing a refrigerator main body, gasket assemblies provided in the parts where the plurality of doors face each other to be attached to the counterpart doors to seal up a gap between the doors, hinge mechanisms for connecting the doors to the refrigerator main body so that the doors are horizontally moved with respect to the refrigerator main body to some extent, actuators for horizontally moving the doors so that the gasket assemblies are separated from the counterpart doors when the doors are opened, and actuator driving mechanisms for driving the actuators. Therefore, it is possible to completely separate the two gaskets from each other so that it is possible to easily open and close the doors and to prevent the gaskets from contacting each other and to thus prevent the gaskets from being abraded or damaged.

Description

DOOR OPENING AND CLOSING APPARATUS FOR REFRIGERATOR

Technical Field

[1] The present invention relates to a two-door refrigerator, and more particularly, to a door opening and closing apparatus for a refrigerator in which two doors are opened and closed in a state where the doors are horizontally moved so that two side gaskets are separated from each other.

Background Art

[2] FlGs. 1 and 2 illustrate a common french-type refrigerator.

[3] As illustrated in FlGs. 1 and 2, in the french-type refrigerator, a refrigerator compartment 1 is positioned in an upper part and a freezer compartment 2 is positioned in a lower part. In particular, in the french-type refrigerator, a partition for separating the inside of the refrigerator compartment 1 is not formed.

[4] Two doors 3 for opening and closing the refrigerator compartment 1 are formed so that gaskets 10 attached to a refrigerator main body 5 are provided on the circumferences of the doors 3 to prevent chilled air from leaking.

[5] In particular, gaskets 11 are provided in the parts where the two doors 3 meet to prevent the chilled air from leaking. In general, in the french-type refrigerator, a filler is provided in one door so that the gaskets of the two doors are attached to each other or the gaskets 11 of the two doors 3 are attached to each other without the filler, which is referred to as a fillerless-type.

[6] The refrigerator illustrated in FlGs. 1 and 2 is a fillerless-type refrigerator. As i llustrated in FlG. 1, the gaskets 11 provided in the two doors are attached to each other in a state where the two doors 3 are closed to seal up the gap between the two doors 3.

[7] FlG. 3 is a plan-sectional view taken along the direction A of FlG. 1, which illustrates that the gaskets 11 are attached to each other in a state where the two doors 3 are closed. The gaskets 11 include gasket holders 12 provided on the side surfaces where the two doors 3 face each other and gasket rubbers 13 mounted on the gasket holders 12 to be attached to each other.

[8] Magnetic bodies 14 are provided in the gasket rubbers 13 so that the gasket rubbers

13 are attached to each other.

[9] In particular, gasket separating apparatuss 15 for separating the two gaskets 11 from each other to some extent when the doors are initially opened are provided in order to prevent the other door from being opened when one door 3 is opened.

[10] The gasket separating apparatuss 15 rotate the gasket holders 12 about hinges 16 supported to the doors 3 and include cam levers 17 that longitudinally protrude from the hinges 16 to the opposite sides of the gasket holders 12. Cams 6 that face the cam levers 17 are provided in the refrigerator main bodies 5 to contact the cam levers 17 so that the gasket rubbers 13 and the gasket holders 12 rotate about the hinges 16 when the doors are opened.

[11] Therefore, as illustrated in FlG. 3, the cams surfaces 18 of the cam levers 17 are settled in the hind sides of the cams 6 of the refrigerator main bodies 5 when the doors 3 are completely closed and rotate about the hinges 16 while passing through the cams 6 of the refrigerator main bodies 5 with the cam levers 17 taken out after the doors when one door 3 is opened. At this time, since the gasket holders 12 simultaneously rotate about the hinges 16, the gasket 11' represented by the dotted lines of FlG. 3 is separated from the gasket 11 of the other door 3 so that only one door is opened.

[12] However, in the conventional gasket separating apparatus of the refrigerator having the above structure, since change in the displacement of the gaskets 11 is smaller than the rotation angle of the cam levers 17 that is generated when the doors 3 are opened, the two gaskets 11 are not completely separated from each other when one door 3 is opened so that the other door is slightly opened after the opened door.

[13] That is, referring to FlG. 3, since a length H from the rotation center, that is, the hinge 16 to the cam lever 17 is commonly larger than a length H from the hinge 16 to the gasket 11, the displacement of the gaskets 11 is smaller than the displacement of the cam levers 17 when the doors are opened. Therefore, the gaskets 11 are not completely separated from the magnetic bodies 14 included in the gaskets 11 or one door is opened in a state where attractive force is applied between the two doors so that the other door is opened to some extent.

[14] Also, since the two gaskets 11 are not completely separated from each other when the doors 3 are opened, as illustrated in FlG. 4, the gasket rubbers 13 lean to one side to be deformed due to the interaction of the two magnetic bodies 14 whenever the doors 3 are opened. When the refrigerator is used for a long time, the gasket rubbers 13 are abraded or damaged so that the life-span of the gaskets are significantly reduced.

[15] Also, since the cam levers 17 and the cams 6 of the refrigerator main body 5 contact each other in the center of the refrigerator that is remotest from the hinges of the doors 3 to separate the gaskets 11 from each other, resistance is large when the doors 3 are opened so that large force is required. Disclosure of Invention Technical Problem

[16] In order to solve the above problems, it is an object of the present invention to provide a door opening and closing apparatus in which doors are opened and closed after the doors are moved in a direction where two gaskets are separated from each other so that it is possible to easily open and close the doors in a state where the two gaskets are separated from each other and to increase the life-span of the gaskets. Technical Solution

[17] In order to achieve the above object, there is provided a door opening and closing apparatus, comprising a plurality of doors for opening and closing a refrigerator main body, hinge devices for connecting the doors to the refrigerator main body so that the doors are horizontally moved with respect to the refrigerator main body to some extent, actuators for horizontally moving the doors so that the doors are separated from the counterpart doors when the doors are opened, and actuator driving mechanisms for driving the actuators.

[18] Here, gasket assemblies are provided in the parts where the plurality of doors face each other to be attached to the counterpart doors and to thus seal up a gap between the doors.

[19] The hinge mechanisms comprise hinge brackets provided in the refrigerator main body, hinge shafts protruding from the hinge brackets, and hinge inserting bodies that are provided in the doors, into which the hinge shafts are inserted, and in which slots are longitudinally provided in a horizontal direction so that the doors are horizontally moved with respect to the hinge shafts to some extent.

[20] The actuators comprise push rods longitudinally connected from the hinge shafts to the insides of the doors, elastic members connected to the ends of the push rods to provide force so that the doors are moved to be attached to the counterpart doors, and solenoid mechanisms provided in the centers of the push rods to provide force that moves the push rods by the actuator driving mechanisms.

[21] On the other hand, unlike the above-described hinge mechanisms, hinge mechanisms according to another embodiment of the present invention may comprise hinge brackets that are provided in the refrigerator main body and in which slots are longitudinally provided in a horizontal direction and hinge shafts protruding from the doors to be inserted into the slots of the hinge brackets.

[22] At this time, the actuators comprise push mechanisms for pushing the doors with respect to the refrigerator main body so that the gasket assembly of the one door is separated from the counterpart door, solenoid mechanisms for providing force to the push mechanisms, and return mechanisms for providing force to the doors in a direction opposite to the push mechanisms when the solenoid mechanisms do not operate.

[23] The actuator driving mechanisms sense that grips provided in the doors are held or pulled to drive the actuators. [24] Unlike the above, the actuator driving mechanisms may sense that the doors are separated from the refrigerator main body to drive the actuators. Advantageous Effects

[25] In the door opening and closing apparatus of the refrigerator according to the present invention having the above structure and operation, since the doors are opened and closed in a state where the doors are horizontally moved so that two gaskets are separated from each other, it is possible to completely separate the two gaskets from each other when the doors are opened and closed. Therefore, it is possible to easily open and close the doors and to prevent the gaskets from contacting each other and to thus prevent the gaskets from being abraded or damaged. Brief Description of the Drawings

[26] FlG. 1 is a front view illustrating a french-type refrigerator.

[27] FlG. 2 is a front view illustrating an opened conventional refrigerator.

[28] FlG. 3 is a plan-sectional view illustrating a main part of a conventional gasket separating device.

[29] FlG. 4 illustrates gaskets deformed when doors are opened according to a conventional art in detail.

[30] FlGs. 5 to 8 illustrate a door opening and closing device of a refrigerator according to a first embodiment of the present invention.

[31] FlG. 5 is a front view and a partial sectional view of the refrigerator.

[32] FlG. 6 is a plan view of a main part in a state where doors are closed.

[33] FlG. 7 is a plan view of a main part in a state where the doors are being opened.

[34] FlG. 8 is a plan view of a main part in a state where the doors are completely opened.

[35] FlGs. 9 to 11 illustrate a door opening and closing device of a refrigerator according to a second embodiment of the present invention.

[36] FlG. 9 is a front view and a partial sectional view of the refrigerator.

[37] FlG. 10 is a plan view of a main part in a state where doors are closed.

[38] FlG. 11 is a plan view of a main part in a state where doors are being opened.

Best Mode for Carrying Out the Invention

[39] Hereinafter, preferred embodiments of the present invention will be described with reference to the attached drawings.

[40] The present invention can be applied to a refrigerator having two doors without a freezer compartment or a refrigerator compartment, a refrigerator whose doors are horizontally opened, and a refrigerator whose doors are vertically opened. Therefore, the present invention can be applied to every refrigerator provided with side gasket assemblies attached to the parts where two doors face each other on the sides of the counterpart doors to seal up the gap between the doors.

[41] The embodiments of the present invention will be described based on a french-type refrigerator having one refrigerator compartment and two doors that can be horizontally opened.

[42] FlGs. 5 to 8 illustrate a door opening and closing apparatus of a refrigerator according to a first embodiment of the present invention. FlG. 5 is a front view of the refrigerator. FlG. 6 is a plan view of a main part in a state where doors are closed. FlG. 7 is a plan view of a main part in a state where doors are being opened. FlG. 8 is a plan view of a main part in a state where the doors are completely opened.

[43] As illustrated in FlG. 5, a freezer compartment 31 is positioned in a low part and a refrigerator compartment 32 having two doors 35L and 35R is positioned in an upper part.

[44] The two doors 35L and 35R are connected to a refrigerator main body 40 by hinge mechanisms 45 so that the refrigerator compartment 32 can be opened and closed.

[45] Gaskets 37 are provided on the circumferences of the doors 35L and 35R to be attached to the refrigerator main body 40 so that chilled air in the compartment does not leak.

[46] In particular, since a partition or the refrigerator main body 40 does not exist in the parts where the two doors 35L and 35R face each other, side gasket assemblies 50 attached to the counterpart doors are provided so that the gap between the doors 35L and 35R are sealed up.

[47] Referring to FlG. 6, the side gasket assemblies 50 include gasket holders 51 provided on the side surfaces of the doors 35L and 35R, gaskets 53 provided in the front sides of the gasket holders 51 to be attached to the gaskets of the counterpart doors, and magnetic bodies 55 provided in the gaskets 53 to generate magnetic force so that the gaskets 53 of the two doors 35L and 35R are attached to each other.

[48] In particular, since the side gasket assembly 50 is attached to the side gasket assembly 50 of the counterpart door to seal up the inside of the refrigerator compartment 32, the side gasket assembly 50 contact the counterpart side gasket assembly 50 when the door 35L or 35R is opened and closed to move after the door 35L or 35R.

[49] Therefore, according to the present invention, in order to prevent the doors 35L and

35R from being opened in a state where the two side gasket assemblies 50 are attached to each other, a apparatus for horizontally moving the doors 35L and 35R when the doors 35L and 35R are opened and closed to separate the two side gasket assemblies 50 from each other is provided.

[50] Hinge mechanisms 45 are provided between the refrigerator main body 40 and the doors 35L and 35R so that the doors 35L and 35R are opened and closed about hinge shafts 47. The hinge mechanisms 45 are formed so that the doors 35L and 35R horizontally move to some extent with respect to the refrigerator main body 40.

[51] As illustrated in FlGs. 5 and 6, the hinge mechanisms 45 include hinge brackets 46 provided in the refrigerator main body 40 to longitudinally extend toward the doors 35L and 35R, the hinge shafts 47 that vertically protrude from the hinge brackets 46, and hinge inserting bodies 48 that are provided in the doors 35L and 35R and into which the hinge shafts 47 are inserted.

[52] In particular, slots 48a are longitudinally provided in the hinge inserting bodies 48 in a horizontal direction so that the doors 35L and 35R move in the horizontal direction to some extent ΔX with respect to the refrigerator main body 40.

[53] Actuators 60 for horizontally moving the doors 35L and 35R are provided in the doors 35L and 35R so that the gasket assemblies 50 are separated from the counterpart doors when the doors 35L and 35R are opened. The actuators 60 push or pull the hinge shafts 47 so that the doors 35L and 35R that include the actuators 60 horizontally move with respect to the hinge shaft 47 fixed to the refrigerator main body 40.

[54] The actuators 60 include push rods 61 that are push mechanisms for pushing the doors 35L and 35R with respect to the main body 40 so that the gasket assembly 50 of one door 35L or 35R is separated from the counterpart door 35L or 35R, solenoid mechanisms 63 for providing force to the push rods 61, and return mechanisms for providing force to the doors 35L and 35R in the direction opposite to the push rods 61 when the solenoid mechanisms 63 do not operate.

[55] The push rods 61 are longitudinally connected from the hinge shafts 47 to the insides of the doors 35L and 35R. The return mechanisms include elastic members 65 connected to the ends of the push rods 61 to provide tensile elastic force so that the doors 35L and 35R move to be attached to the counterpart doors 35L and 35R.

[56] The solenoid mechanisms 63 are provided in the centers of the push rods 61 to provide force that moves the push rods 61 by actuator driving mechanisms 70 to be described later.

[57] The actuators 60 are driven by the actuator driving mechanisms 70 so that the actuators 60 are instantaneously driven when the doors 35L and 35R are opened and closed.

[58] The actuator driving mechanisms 70 sense that the doors 35L and 35R are separated from the refrigerator main body 40 to drive the actuators 60. Door sensors 71 for sensing whether the doors 35L and 35R are opened may be used as the actuator driving mechanisms 70.

[59] The door sensors 71 are provided in the refrigerator main body 40 to sense that the doors 35L and 35R are opened and are almost closed and to provide signals to the actuators 60. [60] Here, the door sensors 71 are preferably formed of two-step sensors that sense that the doors 35L and 35R are opened and closed. That is, the door sensors 71 preferably sense an initial state in which the doors 35L and 35R are opened and a subsequent state in which the doors 35L and 35R are opened to some extent so that one door 35L or 35R is horizontally moved only in a position where the two gasket assemblies 50 interfere with each other and is moved to the initial position again.

[61] Also, the two-step door sensors 71 may not be used but an angle at which the doors

35L and 35R rotate is sensed using door rotation angle sensors (not shown) provided in the hinge mechanisms to drive the actuators.

[62] Any sensor that senses the rotation position of a shaft may be used as the door rotation angle sensor.

[63] Controllers (not shown) for receiving the signals of the door sensors 71 to output control signals are preferably provided between the door sensors 71 and the actuators 60.

[64] Also, the door sensors 71 may separately include a sensor for sensing that the doors

35L and 35R are opened and a sensor for sensing that the doors 35L and 35R are closed.

[65] The operation of the door opening and closing device of the refrigerator according to the first embodiment of the present invention having the above structure will be described as follows.

[66] As illustrated in FlG. 6, since the push rods 61 are pushed by the force of the elastic members 65 in a state where the doors 35L and 35R are closed, the doors 35L and 35R are moved to the counterpart doors. At this time, the gasket assemblies 50 between the two doors 35L and 35R are attached to each other to seal up the inside of the refrigerator compartment.

[67] When a user pulls one door 35R in order to open the doors 35L and 35R, the door

35R is separated from the refrigerator main body 40 to some extent and the door sensor 71 provided between the door 35R and the refrigerator main body 40 senses that the door 35R is separated from the refrigerator main body 40 to input a signal to the controller.

[68] At the same time, the controller outputs the signal to the solenoid mechanism 63 to pull the push rod 61 so that the door 35R is separated from the counterpart door 35L to be horizontally moved as illustrated in FlG. 7.

[69] At this time, the two gasket assemblies 50 attached to each other between the two doors 35L and 35R are separated from each other so that it is possible to open the door 35R without the gaskets contacting each other.

[70] When the door 35R is further opened, the door sensor 71 senses that the door 35R is opened in a position where the gasket 53 of the opened door 35R does not contact the counterpart gasket and the controller that received the signal outputs the signal to the solenoid mechanism 63. At this time, the force generated by the solenoid mechanism 63 is removed as illustrated in FlG. 8 so that the door 35R is returned to the initial state by the force of the elastic member 65 to be opened.

[71] To the contrary, in a case where the door is closed, when the gasket of the closed door almost reaches the position in which the gasket and the counterpart gasket interfere with each other, the door sensor 71 senses that the gasket of the closed door almost reaches the position in which the gasket and the counterpart gasket interfere with each other to output a signal to the controller and the controller drives the solenoid mechanism 63 to move the door in a direction where the door is separated from the counterpart door.

[72] Then, when the door is almost closed, the door sensor 71 senses that the door is almost close so that the controller returns the door to the initial state. At this time, the two gaskets 53 are attached to each other so that the inside of the refrigerator is sealed up.

[73] Hereinafter, a door opening and closing apparatus of a refrigerator according to a second embodiment of the present invention will be described. The same elements as the elements according to the first embodiment of the present invention will be denoted by the same reference numerals and detailed description thereof will be omitted.

[74] FlGs. 9 to 11 illustrate the door opening and closing apparatus of the refrigerator according to the second embodiment of the present invention. FlG. 9 is a front view of the refrigerator. FlG. 10 is a plan view of a main part in a state where doors are closed. FlG. 11 is a plan view of a main part in a state where the doors are being opened.

[75] In the door opening and closing apparatus of the refrigerator according to the second embodiment of the present invention, hinge shafts 147 are provided in the doors 35L and 35R unlike in the above-described first embodiment where the hinge shafts 47 are provided in the refrigerator main body 40.

[76] That is, hinge mechanisms 145 include hinge brackets 146 that are provided in the refrigerator main body 40 and in which slots 146a are longitudinally formed and the hinge shafts 147 that protrude from the doors 35L and 35R to be inserted into the slots 146a of the hinge brackets 146.

[77] Therefore, according to the present embodiment, the doors 35L and 35R and the hinge shafts 147 move with respect to the refrigerator main body 40 and the hinge brackets 146 in accordance with the driving of actuators 160.

[78] Also, the actuators 160 are provided in the refrigerator main body 40 as illustrated in FlG. 10 to push protrusions 166 that are fixed to and that protrude from the doors 35L and 35R.

[79] The actuators 160 include push rods 161 for pushing the protrusions 166 of the doors 35L and 35R, solenoid mechanisms 163 for linearly reciprocating the push rods 161 in accordance with signals of controllers (not shown), and elastic members 165 that are return mechanisms supported to the hinge brackets 146 to push the hinge shafts 147.

[80] A widely used linear motor may be used as a device that realizes the function of the actuators 160 as one mechanism.

[81] The door sensors 71 may be used for driving the actuators 60 as illustrated in the above-described embodiment. However, as illustrated in FlG. 9, sensors may be directly provided in grips 130 so that the sensors sense that the doors 35L and 35R are opened and closed when the user holds the grips 130 to open and close the doors 35L and 35R and that the actuators 160 are driven.

[82] Here, push sensors that can be directly pressed by the fingers of the user may be used as the grip sensors 171 or the grip sensors 171 may sense that the user holds the grips 130 in order to open the doors 35L and 35R to horizontally move the doors 35L and 35R.

[83] In the door opening and closing apparatus according to the second embodiment of the present invention having the above structure, since the push rods 161 are pushed by the force of the elastic members 165 in the state where the doors 35L and 35R are closed as illustrated in FlG. 10, the doors 35L and 35R are moved to the counterpart doors. At this time, the gasket assemblies 50 between the two doors 35L and 35R are attached to each other to seal up the inside of the refrigerator compartment.

[84] In such a state, when the user pulls the grip 130 of one door 35R in order to open the doors 35L and 35R, the door 35R is separated from the refrigerator main body 40 to some extent and, at the same time, the grip sensor 171 senses that the door 35R is separated from the refrigerator main body 40 to some extent to input a signal to the controller.

[85] At the same time, the controller outputs the signal to the solenoid mechanism 163 to pull the push rod 161 so that the door 35R is separated from the counterpart door 35L to be horizontally moved as illustrated in FlG. 11.

[86] At this time, the two gasket assemblies 50 attached to each other between the two doors 35L and 35R are separated from each other so that it is possible to open the door 35R without the gaskets contacting each other.

[87] To the contrary, in a case where the door is closed, when the user holds the grip 130 to press the grip sensor 171, the grip sensor 171 senses that the user holds the grip 130 to output a signal to the controller and the controller drives the solenoid mechanism 163 to move the door in a direction where the door is separated from the counterpart door.

[88] Then, when the door is almost closed so that the user puts a hand off the grip 130, the door is returned to the initial state by the actuator 160. At this time, the two gasket assemblies 50 are attached to each other to seal up the inside of the refrigerator.

[89]

Industrial Applicability

[90] In the door opening and closing apparatus of the refrigerator according to the present invention having the above structure and operation, since the doors are opened and closed in the state where the doors are horizontally moved so that the two gaskets are separated from each other when the doors are opened and closed, it is possible to completely separate the two gaskets from each other when the doors are opened and closed. Therefore, it is possible to easily open and close the doors and to prevent the gaskets from contacting each other and to thus prevent the gaskets from being abraded or damaged.

[91]

[92]

Claims

[1] A door opening and closing apparatus of a refrigerator, comprising: a plurality of doors for opening and closing a refrigerator main body; hinge devices for connecting the doors to the refrigerator main body so that the doors are horizontally moved with respect to the refrigerator main body to some extent; actuators for horizontally moving the doors so that the doors are separated from the counterpart doors when the doors are opened; and actuator driving mechanisms for driving the actuators. [2] The door opening and closing apparatus as claimed in claim 1, wherein the hinge mechanisms comprise: hinge brackets provided in the refrigerator main body; hinge shafts protruding from the hinge brackets; and hinge inserting bodies that are provided in the doors, into which the hinge shafts are inserted, and in which slots are longitudinally provided in a horizontal direction so that the doors are horizontally moved with respect to the hinge shafts to some extent. [3] The door opening and closing apparatus as claimed in claim 2, wherein the actuators comprise: push rods longitudinally connected from the hinge shafts to the insides of the doors; elastic members connected to the ends of the push rods to provide force so that the doors are moved to be attached to the counterpart doors; and solenoid mechanisms provided in the centers of the push rods to provide force that moves the push rods by the actuator driving mechanisms. [4] The door opening and closing apparatus as claimed in claim 1, wherein the hinge mechanisms comprise: hinge brackets that are provided in the refrigerator main body and in which slots are longitudinally provided in a horizontal direction; and hinge shafts protruding from the doors to be inserted into the slots of the hinge brackets. [5] The door opening and closing apparatus as claimed in claim 1 or 4, wherein the actuators comprise: push mechanisms for pushing the doors with respect to the refrigerator main body so that the one door is separated from the counterpart door; solenoid mechanisms for providing force to the push mechanisms; and return mechanisms for providing force to the doors in a direction opposite to the push mechanisms when the solenoid mechanisms do not operate. [6] The door opening and closing apparatus as claimed in any one of claims 1 to 5, wherein the actuator driving mechanisms sense that grips provided in the doors are held or pulled to drive the actuators. [7] The door opening and closing apparatus as claimed in any one of claims 1 to 5, wherein the actuator driving mechanisms sense that the doors are separated from the refrigerator main body to drive the actuators. [8] A door opening and closing apparatus of a refrigerator, comprising: a plurality of doors for opening and closing a refrigerator main body; gasket assemblies provided in the plurality of doors to be attached to the counterpart doors to seal up a gap between the doors; hinge mechanisms for connecting the doors to the refrigerator main body so that the doors are horizontally moved with respect to the refrigerator main body to some extent; actuators for horizontally moving the doors so that the gasket assemblies are separated from the counterpart doors when the doors are opened; and actuator driving mechanisms for driving the actuators.