KR102388453B1 - Door opener for medical devices - Google Patents

Abstract

The present invention relates to a door opening/closing device for medical equipment. The door opening/closing device for medical equipment includes: a medical equipment body (110) having a door (111) vertically installed to enable a patient to enter into the medical equipment; a lower base member (130) installed in a lower part of the medical equipment body (110) to support a lower part of the door (111); an upper base member (150) installed in an upper part of the medical equipment body (110) to support an upper part of the door (111); an upper opening/closing member (170) installed on the upper base member (150) to enable the opening/closing of the door (111); and a lower opening/closing member (190) installed on the lower base member (130) to enable the opening/closing of the door (111). Therefore, the door can be stably rotated to be opened and closed by the upper opening/closing member installed in the upper part of the door, the door, which is a heavy object, can be stably supported by the lower opening/closing member, and the door can be stably rotated as the upper and lower opening/closing members are rotated while being interlocked in the same manner.

Description

Door opener for medical devices

The present invention relates to a door opening and closing device for a medical device, and more particularly, to a door opening and closing device for a medical device capable of opening and closing a door of a medical device made of a heavy object in a simple and stable manner.

In general, a light emitting diode (Light Emitting Diode: LED) is one of the light emitting devices that emit light when a current is applied. Light-emitting diodes can emit high-efficiency light with a low voltage, and thus have an excellent energy-saving effect.

Nitride semiconductors are receiving great attention in the field of developing optical devices and high-power electronic devices due to their high thermal stability and wide bandgap energy. In particular, ultraviolet (UV) light-emitting devices, blue light-emitting devices, green light-emitting devices, and red light-emitting devices using nitride semiconductors have been commercialized and widely used.

The ultraviolet light emitting device (UV LED) is a light emitting device that emits light in a wavelength range of 200 nm to 400 nm. The ultraviolet light emitting device is composed of a short wavelength and a long wavelength depending on the use. The short wavelength may be used for sterilization or purification, and the long wavelength may be used for an exposure machine or a curing machine. In particular, UVB of 280 nm to 320 nm can be used in medical devices.

Recently, UVB UV light emitting devices used in precise medical devices are required to realize a target wavelength within 280 nm to 320 nm and high-efficiency UV light emitting devices capable of high current driving. Furthermore, the light emitting module for medical devices can reduce the number of light emitting devices, realize uniformity of light of 70% or more, and realize a wavelength band for treatment.

Medical equipment for treatment using negative pressure is to obtain a therapeutic effect by placing a vacuum cup on a specific part of the patient's skin and then using a pump to provide negative pressure to the skin. there is a trend

Medical devices for treatment using negative pressure include a massage device using vacuum, a lipolysis device that sucks the patient's skin using vacuum and irradiates ultrasonic waves on the suctioned area to break down fat, and cupping that sucks the skin to obtain oriental medicine treatment effect. devices, etc.

Conventional medical devices that obtain a therapeutic effect using negative pressure are treating the skin of a patient by inhaling air inside a cup that is in close contact with the patient's skin and maintaining a vacuum state by operating a pump to provide negative pressure.

That is, the conventional medical device for treatment using negative pressure obtains a therapeutic effect while maintaining a vacuum state for a certain period of time in a state in which the vacuum cup is fixed in close contact with the patient's skin.

As described above, in medical devices such as medical devices or atopic treatment devices using ultraviolet rays, a door is installed so that a patient can enter and exit the medical device.

The doors of these medical devices not only have a predetermined thickness in order to prevent the light source, etc. expressed from the body of the medical device from being exposed to the outside, but also have a light source installed on the door so that the light source can be irradiated to the whole body.

Accordingly, the door installed in the medical device is made of a heavy material, and when opening and closing the door, which is a heavy product, the door does not open and close smoothly, and excessive force must be used to open and close the door. Alternatively, there is a problem such as giving a strain to the muscular system by excessively using muscle strength to medical personnel.

For example, Patent Document 1 below discloses 'a door assembly of a positive and negative pressure control chamber'.

The door assembly of the positive and negative pressure control chamber according to Patent Document 1 includes a chamber housing having an accommodating space therein so that a user can enter and exit, and the accommodating space can be changed to a positive or negative pressure atmosphere, and one or both ends of the chamber housing a support frame provided in the accommodating space to communicate the accommodating space and the external space of the chamber housing, and mounted on one side of an inner edge of the support frame disposed toward the accommodating space to seal or open the accommodating space inside the chamber housing an inner door part for closing or opening the accommodating space from the outside of the chamber housing by being mounted on one side of the outer edge of the support frame disposed toward the outer space, and along the inner edge of the support frame A first stepped groove formed to be stepped and to which an edge of the inner door part rotatably coupled with respect to the support frame is seated and fixed, one side of the inner edge of the support frame and the inner door part are interconnected, and the support frame A plurality of first hinge pieces that support the inner door part to be rotatable with respect to each other, are formed to be stepped along the outer edge of the support frame, and the edges of the outer door part rotatably coupled to the support frame are seated and fixed and a second step groove and a plurality of second hinge pieces interconnecting one side of the outer edge of the support frame and the outer door, and supporting the outer door to be rotatable with respect to the support frame.

Patent Document 2 below discloses a 'radiation shielding door device'.

The radiation shielding door device according to the following Patent Document 2 is to open and close the exit of the containment and shielding facility that contains and stores the radiation generating material. In the radiation shielding door device, as a member of the length member coupled to the upper side of each of the left and right doors, a rack gear having gear teeth formed on its upper surface and a pair of rotatably installed pinion gears each meshed with the pair of rack gears are formed. Driven by a driven pulley and a driving pulley that is fixedly installed on the upper side of the left and right doors and is shaft-coupled to a motor that generates a rotational force, and a driving means consisting of a pair of belts connecting the driven pulley and each driven pulley; The left and right doors by increasing the airtightness of a pair of jetting bodies, each installed in the longitudinal direction on the door and having nozzles for selectively jetting high-pressure air at equal intervals, and the parts in contact with the left and right doors A gasket rail installed in the longitudinal direction on the side of any one door and provided with an elastic pin elastically contacting both sides of the inserted door in which a groove-shaped fitting portion is formed into which a part of the opposite side of the door is inserted. includes

Korean Patent Publication No. 10-2021-0044434 Korean Patent Publication No. 10-2006-0016837 Republic of Korea Patent Registration No. 10-2129344

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and to provide a door opening and closing device for a medical device capable of easily and smoothly opening and closing a door, which is a heavy object installed in a medical device.

Another object of the present invention is to provide a door opening/closing device for a medical device that facilitates opening and closing of the door in a state in which the door, which is a heavy object, is stably supported.

In order to achieve the above object, the door opening and closing device for a medical device according to the present invention includes a medical device body 110 in which the door 111 is vertically installed so that a patient can enter and exit the medical device; a lower base member 130 installed at a lower portion of the medical device body 110 to support a lower portion of the door 111; an upper base member 150 installed on the upper portion of the medical device body 110 to support the upper portion of the door 111; an upper opening/closing member 170 installed on the upper base member 150 to open and close the door 111; and a lower opening/closing member (190) installed on the lower base member (130) to open and close the door (111).

The lower base member 130 includes a lower base body 131 on which the medical device body 110 and the door 111 are supported; a first rotation hole 132 formed in the lower base body 131 so that the lower opening and closing member 190 is rotatably installed; a second rotation hole 133 formed to be spaced apart from the first rotation hole 132 by a predetermined distance so that the lower opening and closing member 190 is rotatably installed; A height adjustment base 135 is provided to adjust the height of the medical device body 110, and a lower support leg 134 installed on the bottom surface of the lower base body 131; characterized in that it includes.

The upper base member 150 includes an upper base body 151 installed on the upper surface of the medical device body 110; a fixing plate 152 installed to protrude from the front of the upper base body 151; a first rotation hole 153 formed in the upper base body 151 so that the upper opening and closing member 170 is rotatably installed; a second rotation hole 154 formed to be spaced apart from the first rotation hole 153 by a predetermined distance so that the upper opening and closing member 190 is rotatably installed; and a guide hole 155 formed in a predetermined arc shape so that the second driving unit 181 of the upper opening/closing member 170 can be rotated.

The upper opening and closing member 170 includes a driving unit 171 installed on the upper base member 150 to open and close the door 111; a first driving unit 176 rotatably installed by the driving unit 171 to open and close the door 111; and a second driving unit 181 that is rotatably installed in conjunction with the first driving unit 176 so that the door 111 rotates smoothly.

The driving unit 171 includes a first bevel gear 172 rotatably installed by a driving motor 171; a second bevel gear 174 rotatably installed at a right angle to the first bevel gear 172; and a spindle (175) fixed to the second bevel gear (174).

The first driving unit 176 includes a fixing plate 177 fixed to the upper surface of the upper base member 150; a bearing 178 installed to smoothly rotate the spindle 175; a bearing cover 179 installed to surround the bearing 178; a driving bracket 180 that is rotatably installed by the spindle 175; a first coupling hole (180a) formed at one side of the drive bracket (180) so that the drive bracket (180) is rotatably coupled by the spindle (175); a second coupling hole (180b) formed on the other side of the drive bracket (180) so that the drive bracket (180) is coupled to the door (111);

The second driving unit 181 includes a fixing plate 182 fixed to the upper base member 150; a bearing 183 installed on the upper surface of the fixing plate 182; a rotating spindle 184 rotatably coupled to the bearing 183; and a bearing cover (185) installed to surround the bearing (183).

The lower opening and closing member 190 includes a first rotation unit 191 rotatably installed on the bottom surface of the door 111 so that the door 111 can be opened and closed; and a second rotation unit (201) installed on the lower surface of the door (111) so as to be rotated in conjunction with the first rotation unit (191).

As described above, according to the door opening and closing device for medical devices according to the present invention, the door can be stably opened and closed by rotating the door by the upper opening and closing member installed on the upper part of the door, and the door, which is a heavy object, is stably supported by the lower opening and closing member. The effect of stably rotating the door is obtained by rotating the upper opening and closing member and the lower opening and closing member in the same way.

1 is a three-dimensional view showing a door opening and closing device for a medical device according to a preferred embodiment of the present invention;
2 is an exploded three-dimensional view showing a door opening and closing device for a medical device according to a preferred embodiment of the present invention;
3 is an exploded three-dimensional view showing a door opening and closing device for a medical device according to a preferred embodiment of the present invention;
4 is an exploded three-dimensional view showing a door opening and closing device for a medical device according to a preferred embodiment of the present invention;
5 is a bottom exploded three-dimensional view showing a door opening and closing device for a medical device according to a preferred embodiment of the present invention;
6 is an exploded three-dimensional view showing a door opening and closing device for a medical device according to a preferred embodiment of the present invention;
7 is an exploded perspective view illustrating a door opening and closing device for a medical device according to a preferred embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art can easily carry out the present invention.

However, since the description of the present invention is merely an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiment described in the text.

For example, it should be understood that the scope of the present invention includes equivalents capable of realizing the technical idea because the embodiments are capable of various changes and may have various forms.

In addition, the scope of the present invention should not be construed as being limited thereby because the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only such effects.

In the present specification, the present embodiment is provided so that the disclosure of the present invention is complete, and to fully inform those of ordinary skill in the art to which the present invention belongs, the scope of the invention. And the invention is only defined by the scope of the claims.

Accordingly, in some embodiments, well-known components, well-known operations, and well-known techniques have not been specifically described in order to avoid obscuring the present invention.

Meanwhile, the meaning of the terms described in the present invention is not limited to the dictionary meaning, and should be understood as follows.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined.

Terms defined in general used in the dictionary should be interpreted as having the same meaning in the context of the related art, and cannot be interpreted as having an ideal or excessively formal meaning unless explicitly defined in the present invention.

Hereinafter, a door opening and closing device for a medical device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The medical device door opening and closing device according to a preferred embodiment of the present invention supports the medical device body 110 in which the door 111 is vertically installed so that a patient can enter and exit the medical device, and the lower portion of the door 111. The lower base member 130 is installed on the lower part of the medical device body 110, and the upper base member 150 is installed on the upper part of the medical device body 110 to support the upper part of the door 111. , an upper opening and closing member 170 installed on the upper base member 150 to open and close the door 111, and a lower portion installed on the lower base member 130 to open and close the door 111 It includes an opening and closing member 190 .

1 is a three-dimensional view showing a door opening and closing device for medical devices according to a preferred embodiment of the present invention, FIG. 2 is an exploded three-dimensional view showing a door opening and closing device for medical equipment according to a preferred embodiment of the present invention, and FIG. 3 is It is an exploded three-dimensional view showing a door opening and closing device for a medical device according to a preferred embodiment of the present invention.

1 to 3 , in the door opening and closing device for a medical device according to an embodiment of the present invention, the medical device body 110 is provided vertically so that a patient can receive treatment while entering the interior.

A door 111 that can be opened and closed is installed on the front side of the medical device body 110 to enter and exit the medical device body 110 .

In addition, a lower base member 130 for supporting the door 111 is installed on the lower surface of the medical device body 110 , and the upper base of the medical device body 110 has the upper base so that the door 111 can rotate stably. The member 150 is installed.

4 is an exploded three-dimensional view showing a door opening and closing device for medical devices according to a preferred embodiment of the present invention, and FIG. 5 is an exploded perspective view showing a door opening and closing device for medical equipment according to a preferred embodiment of the present invention. 6 is an exploded stereoscopic view showing a door opening and closing device for medical devices according to a preferred embodiment of the present invention, and FIG. 7 is an exploded perspective view showing a door opening and closing device for medical devices according to a preferred embodiment of the present invention.

4 to 7 , the lower base body 131 of the lower base member 130 is formed in a predetermined size and shape, and a lower opening and closing member 190 is formed on the upper surface of the lower base body 131 . ) to be installed, the first rotation hole 132 and the second rotation hole 133 are formed to be spaced apart by a predetermined distance.

In addition, a lower support 134 for supporting a medical device is installed on the lower surface of the lower base body 131 , and a height adjustment support 135 is installed on the lower support 134 to adjust the installation height of the medical device. .

The upper base body 151 of the upper base member 150 is formed in the same size and shape as the lower base body 131 , and the upper opening and closing member 170 can be installed on the front surface of the upper base body 151 . A fixing plate 152 is installed.

A first rotation hole 153 is formed in the fixing plate 152 to correspond to the first rotation hole 132, and a second rotation hole 154 is formed to correspond to the second rotation hole 133, An arc-shaped guide hole 155 is formed at one side of the second rotation hole 154 so that the door 111 can be rotated in an arc shape.

An upper opening/closing member 170 is installed on the fixing plate 152 of the upper base member 150 , and a lower opening/closing member 190 interlocking with the upper opening/closing member 170 is installed on the lower base member 130 . .

The upper opening/closing member 170 includes a driving unit 171 that generates a rotational force to open and close the door 111 , and a first driving unit 176 that opens and closes the door 111 by the driving unit 171 . and a second driving unit 181 interlocked with the first driving unit 176 .

The driving unit 171 includes a first bevel gear 173 rotated by a driving motor 172 , a second bevel gear 174 installed in a direction perpendicular to the first bevel gear 173 , and the It consists of a spindle (175) fixed to the second bevel gear (174).

The driving motor 172 generates a rotational force by the applied power, and rotates the first bevel gear 173 . In addition, the second bevel gear 174 is rotated by the first bevel gear 173 while rotating the spindle 175 in a forward and reverse direction.

The first driving unit 176 is installed in the first rotation hole 153 of the fixed plate 152 , and the second driving unit 181 is installed in the second rotation hole 154 of the fixing plate 152 . do.

The fixed plate 177 of the first driving unit 176 is fixed to the upper surface of the fixed plate 152, and a bearing cover 178 surrounding the bearing 179 is installed on the fixed plate 177, and the bearing cover A bearing 179 is installed inside the 178 so that the spindle 175 can rotate smoothly.

A driving bracket 180 formed with a predetermined length is installed under the spindle 175, and a first coupling hole 180a to which the spindle 175 is coupled is formed on one side of the driving bracket 180, and driving A second coupling hole 180b coupled to the door 111 is formed at the other side of the bracket 180 .

A second driving unit 181 is installed in the second rotation hole 154 , and the fixing plate 182 of the second driving unit 181 is fixed to the upper surface of the fixing plate 152 , and the fixing plate 182 is fixed to the upper surface of the fixing plate 152 . ), a bearing 183 is installed so that the rotating spindle 184 can rotate smoothly.

A bearing cover 185 is installed so that the bearing 183 is not exposed to the outside, a driving bracket 186 is installed under the rotating spindle 185, and a rotating spindle 186 is installed on one side of the driving bracket 186. A first coupling hole 186a to which 184 is coupled is formed, and a second coupling hole 186b is formed at the other side of the drive bracket 186 to allow the door 111 to be coupled thereto.

On the other hand, unexplained reference numeral 187 is a cable bracket 187 that allows the cables to be arranged and installed.

The lower opening and closing member 190 opens and closes the door 111 in conjunction with the upper opening and closing member 170 , and the lower opening and closing member 190 is a first rotation unit 191 corresponding to the first driving unit 176 . ) and a second rotation unit 201 corresponding to the second driving unit 181 .

The fixing plate 192 of the first rotation unit 191 is fixed to the upper surface of the lower base body 131, and the fixing plate 192 has a central hole 193 so that the spindle 195a can be fitted and coupled. A plurality of fixing holes 194 are formed on the outside of the central hole 193 so that the bearing cover 196 can be fitted and fixed.

In addition, a spindle 195a is coupled to the central hole 192 , and a bearing 195 is coupled to the spindle 195a to smoothly rotate.

In addition, a bearing cover 196 is covered on the bearing 195 , and a plurality of cover fixtures 197 are integrally formed on the bearing cover 195 to be fixed to the fixing plate 192 .

A rotation bracket 198 is installed on the upper surface of the bearing cover 196, and a first hole 198a coupled to the spindle 195a is formed on one side of the rotation bracket 198, and the rotation bracket 198 A second hole 198b is formed on the other side of the door 111 to be coupled to the door 111 .

In addition, an auxiliary bracket 199 is installed on the bottom surface of the rotation bracket 198 to more firmly support the door 111, which is a heavy object, and a support 199a for supporting the auxiliary bracket 199 is installed.

The second rotation unit 201 is installed to correspond to the second driving unit 181 of the upper opening and closing member 170 , and the fixing plate 202 of the second rotation unit 201 is the lower base body 131 . ), and a central hole 203 is formed in the center of the fixing plate 202 so that the spindle 205a can be inserted and coupled, and the bearing cover 206 is coupled to the outside of the central hole 203. A plurality of fixing holes 204 are formed to be able to do so.

A bearing 205 is installed on the fixing plate 202 so that the spindle 205a rotates smoothly, and a bearing cover 206 surrounding the bearing 205 is installed.

A spindle 205a is rotatably coupled to the bearing 205 , and the spindle 205a is rotatably coupled to the central hole 203 and the second rotation hole 133 .

The cover fixture 207 of the bearing cover 206 is fitted and fixed in the fixing hole 204 of the fixing plate 202 , and a rotation bracket 208 is installed on the upper surface of the bearing cover 206 .

A first hole 208a is formed in one side of the rotation bracket 208 to be coupled to the spindle 205a, and a second hole 208b is formed in the other side of the rotation bracket 208 to be coupled to the door 111. .

1 to 7, the door opening and closing device is rotated by a predetermined angle so that the patient can enter and exit the door 111 made of a heavy object into the medical device, the driving motor of the upper opening and closing member 170 As the 172 is rotated, the bevel gears 173 and 174 are rotated.

As the spindle 175 fixed to the second bevel gear 174 rotates, the driving bracket 180 of the first driving unit 176 is rotated.

By the rotation of the first driving unit 176 , the second driving unit 181 is rotated in association with the first driving unit 176 .

Accordingly, the door 111 is rotated by an angle set by the driving units 176 and 181 .

On the other hand, the first rotation unit 191 and the second rotation unit 201 of the lower opening and closing member 190 are interlocked with the driving units 176 and 181 to rotate.

That is, the upper opening and closing member 170 is driven to rotate the door 111 , and the lower opening and closing member 190 rotates while interlocking with the driving units 176 and 181 while keeping the door 111 horizontal. do.

Although the invention made by the present inventors has been described in detail according to the above embodiments, the present invention is not limited to the above embodiments and various modifications can be made without departing from the gist of the present invention.

110: medical device body 111: door
130: lower base member 131: lower base body
132: first rotation hole 133: second rotation hole
134: lower support legs 135: height adjustable support
150: upper base member 151: upper base body
152: fixed plate 153: first rotation hole
154: second rotation hole 155: guide hole
170: upper opening and closing member 171: drive unit
172: drive motor 173: first bevel gear
174: second bevel gear 175: spindle
176: first driving unit 177: fixed plate
178: bearing cover 179: bearing
180: drive bracket 180a: first coupling hole
180b: second coupling hole 181: second driving unit
182: fixed plate 183: bearing
184: rotating spindle 185: bearing cover
186: drive bracket 187: cable bracket
190: lower opening and closing member 191: first rotation unit
192: fixed plate 193: center hole
194: fixing hole 195: bearing
196: bearing cover 197: cover fixture
198: rotation bracket 198a: first hole
198b: second hole 199: auxiliary bracket
201: second rotation unit 202: fixed plate
203: center hole 204: fixing hole
205: bearing 206: bearing cover
207: cover fixture 208: rotation bracket
208a: first hole 208b: second hole

Claims (6)

a medical device body 110 having a door 111 vertically installed so that a patient can enter and exit the medical device;
a lower base member 130 installed at a lower portion of the medical device body 110 to support a lower portion of the door 111;
an upper base member 150 installed on the upper portion of the medical device body 110 to support the upper portion of the door 111;
an upper opening/closing member 170 installed on the upper base member 150 to open and close the door 111;
and a lower opening and closing member 190 installed on the lower base member 130 to open and close the door 111.
The upper base member 150,
an upper base body 151 installed on the upper surface of the medical device body 110;
a fixing plate 152 installed to protrude from the front of the upper base body 151;
a first rotation hole 153 formed in the upper base body 151 so that the upper opening and closing member 170 is rotatably installed;
a second rotation hole 154 formed to be spaced apart from the first rotation hole 153 by a predetermined distance so that the upper opening and closing member 170 is rotatably installed;
and a guide hole (155) formed in a predetermined arc shape so that the second driving unit (181) of the upper opening/closing member (170) can rotate.
According to claim 1,
The lower base member 130 includes a lower base body 131 on which the medical device body 110 and the door 111 are supported;
a first rotation hole 132 formed in the lower base body 131 so that the lower opening and closing member 190 is rotatably installed;
a second rotation hole 133 formed to be spaced apart from the first rotation hole 132 by a predetermined distance so that the lower opening and closing member 190 is rotatably installed;
A height adjustment pedestal (135) is provided to adjust the height of the medical device body (110), and a lower support leg (134) installed on the bottom surface of the lower base body (131); Medical device comprising a; door opener for aircraft.
delete According to claim 1,
The upper opening and closing member 170 includes a driving unit 171 installed on the upper base member 150 to open and close the door 111;
a first driving unit 176 rotatably installed by the driving unit 171 to open and close the door 111;
and a second driving unit 181 that is rotatably installed in conjunction with the first driving unit 176 so that the door 111 rotates smoothly.
The driving unit 171 includes a first bevel gear 172 rotatably installed by a driving motor 171;
a second bevel gear 174 rotatably installed at a right angle to the first bevel gear 172;
and a spindle (175) fixed to the second bevel gear (174).
5. The method of claim 4,
The first driving unit 176 includes a fixing plate 177 fixed to the upper surface of the upper base member 150;
a bearing 178 installed to smoothly rotate the spindle 175;
a bearing cover 179 installed to surround the bearing 178;
a driving bracket 180 that is rotatably installed by the spindle 175;
a first coupling hole (180a) formed at one side of the drive bracket (180) so that the drive bracket (180) is rotatably coupled by the spindle (175);
a second coupling hole (180b) formed on the other side of the drive bracket (180) so that the drive bracket (180) is coupled to the door (111);
The second driving unit 181 includes a fixing plate 182 fixed to the upper base member 150;
a bearing 183 installed on the upper surface of the fixing plate 182;
a rotating spindle 184 rotatably coupled to the bearing 183;
A door opening and closing device for medical equipment comprising a; bearing cover (185) installed to surround the bearing (183).
According to claim 1,
The lower opening and closing member 190 includes a first rotation unit 191 rotatably installed on the bottom surface of the door 111 so that the door 111 can be opened and closed;
and a second rotation unit (201) installed on the lower surface of the door (111) to rotate in conjunction with the first rotation unit (191).

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