Patent Application
20080172993
The present application claims priority under 35 U.S.C. 119 and 35 U.S.C. 365 to Korean Patent Application No. 10-2007-0007358(filed on Jan. 24, 2007), 10-2007-0007360 (filed on Jan. 24, 2007), which is hereby incorporated by reference in its entirety.
1. Field
This document relates to a dust collector of a vacuum cleaner.
2. Description of the Related Art
In general, a vacuum cleaner is an apparatus separating dust in the body of the machine after inhaling the air including dust as using vacuum pressure generated from a suction motor equipped in the body.
The vacuum cleaner is broadly divided into the canister type that a nozzle unit inhaling the air including dust from the space has to be cleaned is connected through the connection pipe as arranged separated from the main body, and an upright type that a nozzle unit and a main body are integrally formed as one piece.
Meanwhile, the dust collector mounted on the vacuum cleaner comprises a dust container having a dust storage part storing dust in the inside and an air suction pipe inhaling the air including dust, a dust separation part separating dust from the air inhaled through the suction pipe, an ejecting hole exhausting the air inhaled in the dust separation part, and a filter member filtering the dust.
Here, a dust separation part and a dust storage part are formed in the inside of the inner space of the dust container as divided by a division wall, and the dust ejecting hole is formed at the wall to discharge the dust to the dust storage part.
Reference will now be made briefly as for the operation of the dust collector configured as above. When the suction motor is operated, the air including dust is inhaled into the dust container. At this time, the air including dust passes the separation process at the dust separation part. Further, the air separated from dust is exhausted through the ejecting hole, and the separated dust is discharged into the dust storage which is the lower part of the dust container through the dust ejecting hole.
According to the conventional dust collector, the dust of relatively high density is fell through the dust ejecting hole in the storage well as the dust collector is composed as the separated dust falls down to the dust storage part by its weigh through the dust ejecting hole formed at the division wall, however, the dust of relatively lower density does not fall down through the dust ejecting hole and is remained in the dust separation part.
Accordingly, a dust collector capable of moving the separated dust into the dust storage part easily is required.
Further, the dust in the air is not removed well as the air is not circulated smoothly, as dust is piled up on the filter member when the dust of lower density is remained in the dust separation part.
Therefore, a dust collector that the filter member is easily exchanged while cleaning of the filter member as well as preventing the minute dust to be piled up on the filter member is required.
The implementations of a dust collector of a vacuum cleaner comprise a dust separation part separating dust from the inhaled air; a dust collecting body storing the dust separated by the dust separation part; and a division part divides the inner space of the dust separation part and the dust storage part, opening and closing the dust separation part selectively, and having an opening discharging the dust into the dust storage part.
Drawings are provided on the following for further understanding of the implementations of a dust collector of a vacuum cleaner
Hereinafter, reference will now be made in detail as for the implementations of a vacuum cleaner with reference to the accompanying drawings.
Referring to
The vacuum cleaner 10 further comprises a suction nozzle inhaling the air including dust and a connection pipe connecting the suction nozzle with the main body 100, though they are not illustrated.
The detailed description for the basic configuration of the suction nozzle and the connection pipe is omitted, as it is the same to the related art.
Particularly, a main body suction port 110 is formed at the lower end of the front of the main body 100 to inhale the air including dust inhaled through the suction nozzle.
A main body discharge port 110 is formed at a side of the main body 100 to exhaust the air from the main body after dust is removed. A handle 140 is formed on an upper portion of the main body 100 for carrying the main body 100.
The dust separation means includes a dust collector 200 having a first cyclone unit—illustrated later—separating the dust from the air inhaled to the inside for the first time, and a second cyclone unit 300 arranged in the main body 100 to separate dust from the air separated for the first time by the first cyclone unit once more.
More particularly, the dust collector 200 is detachably installed to a front portion of the main body 100.
A removal lever 142 is equipped at the handle 140 of the main body to attach and detach the dust collector 200 to and from the main body 100, and an engagement end 279 engaged with the removal lever 142 is formed at the dust collector 200.
Further, the dust collector 200 includes a first cyclone unit generating the cyclone movement and a dust collecting body 210 having a dust storage part storing the dust separated in the first cyclone unit.
Here, the dust collector 200 is mounted as attached and removed to and from the main body 100 as described above, and the dust collector 200 is communicated with the main body 100 and the second cyclone unit 300 as the dust collector 200 is mounted at the main body 100.
Particularly, an air outlet 130 exhausting the air inhaled to the main body 100 to the dust collector 200 and a first air inlet 218 inhaling the air from the air outlet 130 are formed in the main body 100.
Here, it is desirable for the first air inlet 218 to be formed in a tangential direction of the dust collector 200 to generate the cyclone movement in the dust collector 200.
A first air outlet 271 exhausting the air separated with the dust in the first cyclone unit is formed in the dust collector 200, and a connecting path 114 inhaling the air exhausted through the first air outlet 271 is formed at the main body 100.
The air inhaled into the connecting path 114 is inhaled into the second cyclone unit 300.
The second cyclone unit 300 includes a union of a plurality of cone-shaped cyclones. The second cyclone unit 300 is arranged as lied on the upper side of the rear of the main body 100.
As described above, the profits for using spaces is improved in the arrangement relation of the vacuum cleaner that the miniaturization is required with the suction motor and etc as arranging the second cyclone unit 300 to be lied down on the main body 100.
Further, the structure of the dust collector 200 becomes simplified and users can treat the dust collector 200 with lower energy as the weight of the dust collector 200 becomes lighter, as the second cyclone unit 300 is separated from the dust collector 200 and arranged in the main body 100.
The dust separated in the second cyclone unit 300 is stored in the dust collector 200.
For this, a dust inlet 272 inhaling the dust separated in the second cyclone unit 300 and a dust storage part storing the dust separated in the second cyclone unit 300 are further formed in the dust collecting body 210.
The dust storage part formed in the dust collecting body 210 includes a first dust storage part storing the dust separated by the first cyclone unit and a second dust storage part storing the dust separated by the second cyclone unit 300.
That is, the second cyclone unit 300 is composed in the main body 100 as separated from the dust collector 200, but the dust separated in the second cyclone unit 300 is stored in the dust collector 200 in the present embodiment.
Reference will now be made in detail as for the operation of the vacuum cleaner 10 in accordance with the above-mentioned configuration.
First, when the main body 100 is operated as the power is applied to a vacuum cleaner 10, the suction power is generated by suction motor arranged in the main body 100. Then, the air including dust inhaled by suction power through the suction nozzle is inhaled into the dust collector 200 through the connection pipe and a predetermined path formed in the main body 100.
When the air including dust is inhaled into the dust collector 200, the inhaled air is separated by means of the first cyclone unit for the first time. Then, the separated dust is stored in the dust collecting body 210. On the other hand, the air separated form the dust is inhaled into the main body 100 as discharged from the dust collector 200, and inhaled into the second cyclone unit 300 through the connecting path 114 arranged in the main body 100.
The air inhaled into the second cyclone unit 300 is separated from the dust once more, and the separated dust is inhaled into the dust collector 200 and stored in there, finally, the air separated from the dust is exhausted to outside through the main body outlet port after flowing through a predetermined path in the main body 100.
Reference will now be made in detail as for the configuration of the dust collector.
Referring to
Particularly, the dust collecting body 210 is formed as nearly rounded shape and has a dust storage part storing the separated dust.
The dust storage part includes a first dust storage part 214 storing the dust separated in the first cyclone unit 231 and a second cyclone unit 216 storing the dust separated in the second cyclone unit 300.
The dust collecting body 210 includes a first wall 211 forming the first dust storage part 214, and a second wall 212 forming the second dust storage part 216 as related with the first wall 211. That is, the second wall 212 covers a predetermined part of the outer side of the first wall 211.
Therefore, the second dust storage part 216 is formed at the outer side of the first dust storage part 214.
The dust collecting capacity of the first dust storage part 214 is maximized, as the size of the first dust storage part 214 is maximized as arranging the second dust storage part 216 at the outer side of the first dust storage part 214.
A bent portion 219 supporting the lower end of the dust separation part 230 is formed at the first wall 211. Therefore, the dust collector 210 is divided into an accommodation part 213 in which a dust separation part 230 is accommodated and a first dust storage part 214, and the accommodation unit 213 has a diameter bigger than the first dust storage part 214 with the bent portion 219 as a standard.
A strength reinforcing rib 219 is formed at the second dust storage part 216 to strengthen the strength of the second wall 212 forming the second dust storage part 216. That is, the strength reinforcing rib 217 prevents the movement of the second wall 212 toward the first wall 211 when the vacuum pressure is generated by suction motor.
The strength reinforcing rib 217 is formed integral with the first wall 211 and the second wall 212. Therefore, the dust storage part 216 is divided into at least two of spaces by the strength reinforcing rib 217.
Meanwhile, the dust separation part 230 is put into the dust collecting body 210 as described above. Further, the dust separation part 230 includes the first cyclone unit 231 of cylindrical shape separating the dust in the inhaled air by operation of the cyclone, and a dust guide path 240 guiding the separated dust to be discharged into the first dust storage part 214 easily.
Particularly, the dust guide path 240 guides the separated dust to be fall downwardly after flowing toward a tangential direction from the first cyclone unit 231. Reference will be made later as for the dust guide path 240 with reference to the accompanying drawings.
A first guide part 234 is formed at the first cyclone unit 231 to guide the mount of the dust separation part 230, and a second guide part 215 is formed in the dust collecting body 210 as corresponding to the fist guide part 234.
The first guide part 234 is formed as extended toward the lateral part from the first cyclone unit 231. The cross-section of the first guide part 234 is rounded for the smooth guiding operation.
The second guide part 215 is depressed toward the outside from the first wall 211 of the dust collector 210 for the first guide part 234 to be accommodated, as the first guide part 234 is protruded from the first cyclone unit 234. Here, the second guide part 215 is dressed toward the second dust storage part 216 and corresponding to the first guide part 234.
That is, the second guide part 215 is depressed toward the second wall 212 from the first wall 211, and the cross section of the second guide part 215 is rounded.
The reduction of the sense of beauty is prevented as the second guide part 215 is not exposed to outside of the dust collecting body 210 in accordance with the second guide part 215 is depressed toward the second dust storage part 216.
Here, it is possible for the space for storing dust in the second dust storage part 216 to be secured, though the second guide part 215 is depressed toward the second dust storage part 216, since the second dust storage part 216 stores minute dust of relatively smaller volume.
Therefore, a user can put the dust separation part 230 into the dust collecting body 210 easily by each of the guide parts 215 and 234. Further, the coupling of the cover member 270 coupled with the dust separation part 230 and the dust collecting body 210 is guided as the accommodation of the dust separation part 230 is guided.
The dust separation part 230 is fixed to the lower side of the cover member 270 to be separated with the cover member 270 while discharging the dust stored in the dust collecting body 210.
The cover member 270 is detachably coupled at the upper side of the dust collecting body 210. That is, the cover member 270 opens or closes the first dust storage part 214 and the second dust storage part 216 at the same time.
Therefore, the upper side of the dust collecting body 210 is completely opened when a user separates the cover member 270 coupled with the dust separation part 230 from the dust collecting body 210 to discharge the dust stored in the first dust storage part 214 and the second dust storage part 216 to outside. Further, when the user turns the dust collecting body 210 upside down, the dust is easily emptied.
At this time, the re-pollution of the cleaned interior is prevented, as a user separates the cover member 270 from the dust collecting body 210 at the outside or above the trash box to empty the dust collecting body 210.
A filter member 280 is coupled with the lower side of the cover member 270 to filter the air exhausted from the first cyclone unit 231.
Reference will now be made in detail as for the structure of each of the configurations forming the dust collector and for the functions thereof.
Referring to
Therefore, the air passed the first dust separating process in the first cyclone unit 231 is exhausted into the ejecting hole 274 after passing through the filter member 280.
A plurality of engagement ends are formed around the ejecting hole 274 for the engagement of the filter member 280.
Particularly, the engagement ends include a first engagement end 275a and a second engagement end 275b formed as smaller than the first engagement end 275a. As the size of each of the engagement ends 275a and 275b is different, the engagement location of the filter member 280 is guided, and therefore, the filter member 280 is engaged at the exact location at the cover member 270.
A plurality of coupling guides 276 are formed with predetermined intervals at the lower side of the cover member 270 to guide the coupling of the dust separation part 230. Here, the coupling guide 276 wraps a part of the top of the first cyclone unit 231 when the dust separation part 230 is coupled with the cover member 270.
A coupling hole 277 is formed for the coupling of the coupling member at an interval part of the coupling guide 276.
On the other hand, the filter member 280 includes a filter body 281 of cylindrical shape that the upper part is opened. A plurality of holes 282 are formed at the outer circumferential surface of the filter body 281, and a guide rib 284 is formed at the upper side of the filter body 281 to guide the coupling of the filter member 280 as extended in the horizontal direction.
Here, the guide rib 284 also performs a function preventing the air discharged through the ejecting hole 274 to be leaked to the first cyclone unit 231 through the contact part of the filter member 280 and the cover member 270 as stock to the bottom of the cover member 270 while coupling the filter member 280 with the cover member 270.
A plurality of coupling ribs are formed at the guide rib 284 to be coupled with the coupling ends 275a and 275b.
Particularly, the coupling ribs includes a first coupling rib 285a extended toward the horizontal direction from the guide rib 284, and a second coupling rib 285b formed as smaller than the first coupling rib 285a.
Here, the vertical section of the engagement ends 275a and 275b is formed as “L” shape for the coupling ribs 285a and 285b to be engaged with as rotated. Therefore, the filter member 280 is perfectly coupled with the cover member 270 when the coupling ribs 285a and 285b are rotated with a predetermined distance in the clockwise direction in view of
A plurality of dust outlets 273 are formed at the bottom of the cover member 270 to discharge the dust inhaled into the cover member 270 through the dust inlet—refer to 272 in FIG. 3—to the second dust storage part 216. Here, it is desirable that at least two of dust outlets 273 are formed, as the second dust storage part 216 is divided into at least two of spaces by the strength reinforcing rib 217.
Referring to
A division part 250 is coupled with the lower side of the dust separation part 230 to be rotated and covers at least the first cyclone unit 231. The division part 250 divides the first cyclone unit 231 and the first dust storage part 214.
Particularly, a suction port 233 is formed at the first cyclone unit 231 to inhale the air into the inside. The suction port 233 is formed at the location corresponding to the first air inlet 218 formed at the dust collecting body 210.
Therefore, the suction port 233 is communicated with the first air inlet 218 as arranged with the first air inlet 218 when the dust separation part 230 is accommodated into the dust collecting body 210.
Here, the suction unit 233 is formed at a tangential direction of the fist cyclone unit 231 for the inhaled air to be flown along the inner circumferential surface of the first cyclone unit 231.
The bottom part 232 is extended in the horizontal direction from the first cyclone unit 231. Here, the end of the bottom part 232 is rounded with a predetermined curvature, and the assumed line extending the curvature of the end of the bottom 232 called as “the assumed circle of the bottom part 232” has a circular shape.
Further, the diameter of the assumed circle of the bottom part 232 corresponds to the diameter of the accommodation unit 213 of the dust collecting body 210. The diameter of the first cyclone unit 231 is shorter than that of the bottom part 232, since the bottom part 232 is extended toward the lateral part of the first cyclone unit 232.
The center C2 of the first cyclone unit 231 is formed eccentrically against the center C1 of the assumed circle of the bottom 232 as illustrated in
Particularly, the first cyclone unit 231 is formed at the location having the one common tangential line with the assumed circle of the bottom 232. It is for the dust to be flow smoothly as securing the width of the dust guide path 240 described on the following.
The first guide part 234 is formed at the later direction of the first cyclone unit 231 to guide the mount of the dust separation part. The detailed description as for the structure of the first guide part 234 is omitted, since it is the same to the above description.
A plurality of coupling ribs 237 are formed at the top of the first cyclone unit 231 to couple the dust separation part 230, and a coupling hole 237 is formed at each of the coupling rib 237 for the coupling member to be coupled.
Here, when the dust separation part 230 is coupled with the cover member 270, the coupling rib 237 is located at the interval part formed between each of the coupling guide 276.
A dust guide path 240 is supplied at the dust separation part 230 to guide the dust separated by the first cyclone unit 231 to be fallen downwardly after flowing the inside as inhaled toward the tangential direction. On another aspect, the dust guide path 240 performs as a guider for the separated dust to be discharged toward the tangential direction from the first cyclone unit 231.
Particularly, an inlet 242 of the dust guide path 240 is formed at the lower side of the first cyclone unit 231. An outlet of the dust guide path 240 is formed at the division part 250.
That is, the division part 250 covers the assumed circle of the bottom part 232 as formed to be corresponding to the assumed circle of the bottom, and guides the dust inhaled into the dust guide path 240 to be fallen into the first dust storage part 214 as an opening 252 is formed at the location corresponding to the end of the dust guide path 240.
The inlet 242 and the opening 252 have approximately the same size such that dust can smoothly pass through the inlet 242 and the opening 252.
A guide rib 245 is formed at the inlet 242 of the dust guide path 240 to guide the separated dust to be inhaled toward the tangential direction of the first cyclone unit 231. The guide rib 245 is extended toward the tangential direction of the first cyclone unit 231 along the outside and the end of the guide rib 245 reaches the outer circumference of the bottom part 232.
The top part 246 forming the dust guide path 240 is formed vertically at the outside of the first cyclone unit 231 and is extended toward the bottom 232 around the opening 252 from the guide rib 245 around the inlet 242.
The width of the dust guide path 240 is the same to the width of the top part 246. Further, as the first cyclone unit 231 is formed eccentrically against the assumed circle of the bottom part 232 as described above, it is possible for the dust of big volume to flow through the dust guide path 240 as the width of the dust guide path 240 is secured as bigger than a predetermined size.
The top part 246 is curved downwardly as closer to the opening 252 from the inlet 242 for the smooth flowing of the dust.
Therefore, as the top part 246 is curved downwardly, the cross section of the dust guide path 240 becomes smaller as it is closer to the opening 252 from the inlet 242.
Here, even though the cross section of the dust guide path 240 becomes smaller as it is closer to the opening 252 from the inlet 242, the dust is smoothly discharged through the opening 252, since the opening 252, the outlet of the dust guide path 240, is formed downwardly.
The division part 250 is rotated by hinge 236 at the lower side of the dust separation part 230. Here, the hinge 236 is formed at the lower part of the first guide part 234. In this case, the contact of the hinge 236 and the inner circumferential surface of the dust collecting body 210 is prevented, since the hinge 236 is arranged in the second guide part 215 when the dust separation part 230 is arranged in the dust collecting body 210.
A hook 254 is extended upwardly at the division part 250 for the division part 250 to be coupled with the dust separation part 230, and an engagement end 235 is formed at the bottom 232 to be engaged with the hook 254.
Reference will now be made in detail as for the dust separation process and the discharging process for the dust at the dust separation part 230.
The air inhaled into the first cyclone unit 231 through the suction port 233 is separated from the dust as rotated along the inner circumferential surface of the first cyclone unit 231. Further, the separated dust is discharged through the dust guide path 240 toward the tangential direction. Further, the current direction of the dust inhaled into the dust guide path 240 is changed therein, and is stored in the first dust storage part 214 as fell downwardly through the opening 252.
Therefore, as the dust separated in the first cyclone unit 231 is discharged toward the tangential direction of the first cyclone unit 231, that is as the dust is discharged in the same direction to the direction that the dust is rotated, both of the dust of relatively higher density and the dust of relatively lower density are easily discharged from the first cyclone unit 231.
Further, it is advantageous that the dust separation efficiency is improved as the air flows smoothly as the dust of lower density is not piled up at the filter member 280 as the dust of lower density is easily discharged.
Further it is advantageous that the scattering of the dust stored in the first dust storage part 214 is prevented and the reverse-flow of the dust to the first cyclone unit 231 is prevented as the dust inhaled into the dust guide path 240 is discharged into the first dust storage part 214 as the flowing direction is changed in the dust guide path 240.
That is, the reverse-flow of the dust stored in the first dust storage part 214 is prevented, since the flowing direction of the dust flowing backwardly through the dust guide path 240 is opposite to the direction of the flowing direction of the dust inhaled into the dust guide path 240.
Referring to
The dust separation part 230 is coupled securely at the lower side of the cover member 270. The filter member 280 is coupled with or separated from the cover member 280 at the lower side of the first cyclone unit 231.
Particularly, the division part 250 is rotated toward downward of the dust separation part 230 for the coupling or separation of the filter member 280. Then, the lower side of the first cyclone unit 231 is opened. Further, the filter member 280 is coupled or separated through the opened part of the first cyclone unit 231.
It is possible for a user to couple or separate the filter member 280 with or from the cover member 270 easily as the division part 250 is formed at the dust separation part 230 to be rotated, and the filter member 280 is formed to be attached and separated to and from the cover member 270 through the opened lower part of the first cyclone unit 231.
That is, it is possible for the filter member 280 to be coupled and separated as rotating the division part 250 without separating the dust separation part 230 from the cover member 270.
Referring to
Here, the pair of compressing members 221 and 222 reduces the volume of the dust due to the interaction between each other, and accordingly, increases the maximum dust collecting capacity of the first dust storage part 214 as increasing the density of the dust stored in the first dust storage part 214.
Particularly, the pair of compressing members 221 and 222 includes a first compressing member 221 fixed at a fixed shaft 224 protruded at the bottom of the dust collecting body 210, and a second compressing member 222 fixed at a rotating shaft 226 coupled with the fixed shaft 221 as to be rotated. That is, the first compressing member 221 becomes a rotating member, and the second compressing member 222 becomes a fixed member.
A driven gear 228 rotated by the power from outside is coupled with the rotating shaft 226.
Here, though it is not illustrated, an operation gear geared with the driven gear 228 and an operation motor operating the operation gear are arranged in the main body 100.
Therefore, when the operation motor is operated, the operation gear and the driven gear 228 are rotated, and the second compressing member 222 is rotated by the rotation of the driven gear 228.
Here, it is desirable for the second compressing member 222 to be rotated in the both directions to compress dust at the both sides of the first compressing member 221, and accordingly, a synchronous motor can be used as the motor for the operation.
In this preferred embodiment, at least one of the pair of compressing members 221 and 222 is arranged in the dust collecting body to be rotated, but it is possible that both of the compressing members 221 and 222 are arranged in the dust collecting body 210 to be rotated.
It is desirable for the first compressing member 221 to be located at the opposite side of the opening 252 with the central axis of the dust collecting body 210 as a standard not to disturb the falling of dust stored in the first dust storage part 214 through the opening 252 by the first compressing member 221.
Further, it is desirable that a chamfer 223 chamfered with a predetermine angle is formed at the upper end of the second compressing member 222. The chamfer 223 lets the dust discharged easily through the opening 252 as forming a space between the opening 252 and the second compressing member 222 when the upper end of the first compressing member 221 is located at the lower side of the opening 252.
Reference will now be made in detail as for the operation of a vacuum cleaner.
First, suction pressure is generated when the power is applied to the suction motor of a vacuum cleaner 10, and the suction pressure inhales the air including dust through the suction nozzle.
The air inhaled through the suction nozzle is inhaled into the main body 100 through the main body suction port 110, and the inhaled air is inhaled into the dust collector 200 after passing through a predetermined path.
Particularly, the air including dust is inhaled toward the tangential direction of the first cyclone unit 231 through the first air inlet 218 of the dust collector 210. Then, the inhaled air falls down as rotated along the inner circumferential part of the first cyclone unit 231, and the air and the dust are separated from each other as receiving different centrifugal force due to the difference of weight at this process.
Further, the air separated from dust is discharged to outside of the dust collector 200 through the ejecting hole 274 and the first air outlet 271 after filtered through the holes 282 of the filter member 280.
On the other hand, the separated dust is inhaled into the guide path 240 toward the tangential direction at the step rotated along the inner circumferential part of the first cyclone unit 231.
Then, the flowing direction of the dust inhaled into the dust guide path 240 is changed in the dust guide path 240, and the dust is stored in the first dust storage part 214 after falling down through the opening 252.
On the other hand, the air exhausted through the first air outlet 271 is inhaled into the main body 100. Then, the air inhaled into the main body 100 is inhaled into the second cyclone unit 300 after passing through the connection path 114.
The air is leaded toward each of the tangential direction on the inner wall of the second cyclone unit 300 through the second air inlet (not shown) connected to the end of the connection path 114, and is separated from dust once more as rotated therein.
Further, the air separated from dust once more is inhaled into the main body 100.
Then, the air inhaled into the main body 100 is discharged to outside through the main body outlet port formed at a side of the main body 100 after passing through the suction motor.
On the other hand, the separated dust is inhaled into the dust collector 200 through the dust inlet 272, and is finally stored in the second dust storage part 216.
At the step that the dust is separated from the air and is stored in the dust storage part, the pair of compressing members 221 and 222 compresses the dust stored in the first dust storage part 214.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2007-0007358 | Jan 2007 | KR | national |
| 10-2007-0007360 | Jan 2007 | KR | national |
