JPH0838631A - Replacement type dustproof mask - Google Patents
Replacement type dustproof maskInfo
- Publication number
- JPH0838631A JPH0838631A JP6178324A JP17832494A JPH0838631A JP H0838631 A JPH0838631 A JP H0838631A JP 6178324 A JP6178324 A JP 6178324A JP 17832494 A JP17832494 A JP 17832494A JP H0838631 A JPH0838631 A JP H0838631A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- lid
- mask
- dust
- inner lid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、静電フィルターから
なるろ過材を交換可能な防じんマスクに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust mask in which a filter material composed of an electrostatic filter can be replaced.
【０００２】[0002]
【従来の技術】従来、事業場その他の場所において発生
する粒子状物質を吸入すると、人体に有害なおそれがあ
る場合に使用する防じんマスクは、ＪＩＳ Ｔ−８１５
１に規定されている。かかるマスクは、取替え式防じん
マスクと使い捨て式防じんマスクとに大別することがで
き、前者のマスクの一つにろ過材を交換可能にしたもの
がある。また、そのろ過材としてメカニカルフィルター
と静電フィルターとが周知である。メカニカルフィルタ
ーは、ろ紙でできており、その外面に粉じんを堆積させ
て捕集することができ、静電フィルターは、フィルター
構成繊維の周面を帯電させておき、フィルターの外面の
みならずその深層部においても粉じんを捕集することが
できる。2. Description of the Related Art Conventionally, a dust mask used when there is a danger of being harmful to the human body when inhaling particulate matter generated in business sites or other places is JIS T-815.
It is defined in 1. Such a mask can be roughly classified into a replaceable dust mask and a disposable dust mask, and one of the former masks has a filter material that can be replaced. Moreover, a mechanical filter and an electrostatic filter are well known as the filtering material. The mechanical filter is made of filter paper, and dust can be accumulated on the outer surface of the filter to collect it.The electrostatic filter charges the peripheral surface of the filter constituent fibers so that not only the outer surface of the filter but also its deep layer. Dust can also be collected in the part.
【０００３】[0003]
【発明が解決しようとする課題】これらのろ過材は、粉
じん捕集量が多くなるにつれて空気抵抗が高くなり、マ
スク着用者は、息ぐるしさを感じるようになるから、そ
の息ぐるしさの程度を一つの基準にしてろ過材の交換時
期を判断することがある。しかし、息ぐるしさは、その
日の着用者の体調や気温などの環境条件などによって変
化するから、必ずしも適確な判断の基準にはならず、そ
の基準に頼ると、まだ使用できるろ過材を無駄にするこ
とがある。もっともメカニカルフィルターは、捕集した
粉じんの殆ど全てが外面に堆積するから、その堆積量を
観察して交換時期を判断する一助にすることができる。
ところが、静電フィルターは、その深層部で多くの粉じ
んを捕集するもので、外面に粉じんが堆積してもまだ十
分に使用できるということがあるから、外面の様子を観
察するだけでは交換時期を判断できないという問題があ
る。These filter media have a higher air resistance as the amount of collected dust increases, so that the mask wearer feels breathiness. Therefore, the degree of breathability is high. The filter replacement time may be determined based on the above. However, since the breathability changes depending on the physical condition of the wearer on that day and environmental conditions such as temperature, it does not always become a criterion for making an appropriate judgment, and relying on that criterion results in waste of usable filter media. There is something to do. However, since almost all of the collected dust is deposited on the outer surface of the mechanical filter, it can be helpful in deciding the replacement time by observing the deposited amount.
However, the electrostatic filter collects a large amount of dust in its deep layer, and even if dust accumulates on the outer surface, it can still be used sufficiently. There is a problem that you cannot judge.
【０００４】そこで、この発明においては、静電フィル
ターの粉じん捕集量が増加すると、フィルターの内面に
粉じんの色が徐々にしみ出てくることに着目し、静電フ
ィルターを内蓋と外蓋とで挟圧するとともに、内蓋の一
部をフィルターから離間させ、その離間させた部位にフ
ィルターの交換時期を判断する目安となる色の限度見本
を挿入し、内蓋を透視してフィルターと見本とを見比べ
ることができるようにすることで、フィルターの交換時
期の適確な判断を可能にすることを課題にしている。In view of this, in the present invention, attention is paid to the fact that the dust color gradually exudes on the inner surface of the filter when the dust collection amount of the electrostatic filter is increased. While pinching with, part of the inner lid is separated from the filter, and a color limit sample that is a guide to judge the replacement time of the filter is inserted into the separated part, and the inner lid is seen through and the filter is used as a sample. By making it possible to compare with, it is an issue to make it possible to make an appropriate judgment of the replacement time of the filter.
【０００５】[0005]
【課題を解決するための手段】この発明が前記課題を解
決するために手段とするところは、以下のとおりであ
る。[Means for Solving the Problems] The present invention provides means for solving the above problems as follows.
【０００６】この発明においては、少なくとも面体と、
吸気弁と、排気弁とを備え、シート状の静電フィルター
を交換可能に取付けて使用する取替え式防じんマスクを
前提にしている。In the present invention, at least a face piece,
It is premised on a replaceable dust mask which is equipped with an intake valve and an exhaust valve and in which a sheet-shaped electrostatic filter is attached in a replaceable manner.
【０００７】かかる前提において、前記フィルターの外
面周縁への当接部を有する外気取入れ可能な外蓋と、フ
ィルターの内面周縁への当接部を有し、外蓋が着脱可能
に係合するとともに面体に通気可能に連結する内蓋とを
設け、内外蓋の係合によってフィルターをその周縁で挟
圧可能につくり、内蓋をその当接部より内方の少なくと
も一部において前記フィルターの内面からそのフィルタ
ーの厚みの０．５〜１．５倍の距離だけ離間させ、か
つ、その一部を含む所要の範囲を無色透明および着色透
明のいずれかの素材により構成してあることがこの発明
の特徴である。[0007] Under such a premise, the filter has an outside air receptive portion having an abutting portion on the outer peripheral edge of the filter and an abutting portion on the inner peripheral edge of the filter, and the outer lid is detachably engaged. An inner lid that is connected to the face body so as to be able to ventilate is provided, and the filter is made to be able to be pinched at its peripheral edge by the engagement of the inner and outer lids, and the inner lid is at least partly inward from its abutting part The filter is separated by a distance of 0.5 to 1.5 times the thickness of the filter, and a required range including a part of the filter is made of a colorless transparent material or a colored transparent material. It is a feature.
【０００８】[0008]
【作用】このように構成した防じんマスクでは、交換時
期を判断する目安となる程度に粉じんの色がしみ出てい
るフィルターの小片を、色見本として内蓋のフィルター
から離間する部位に挿入し、その見本を透明素材ででき
た内蓋から透視する。新しいフィルターは、使用してい
ると捕集した粉じんの色が徐々に内面にしみ出てくるか
ら、見本と対比して同程度の色になったときに交換す
る。[Function] With the dust mask constructed in this manner, a small piece of filter exuding the dust color to the extent of being a criterion for determining the replacement time is inserted as a color sample into the part separated from the filter of the inner lid, The sample is seen through the inner lid made of transparent material. When using a new filter, the color of the collected dust gradually exudes to the inside, so replace it with a new filter when the color becomes comparable to the sample.
【０００９】[0009]
【実施例】この発明に係る取替え式防じんマスクの詳細
を添付の図面を参照して説明すると、以下のとおりであ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the replaceable dust mask according to the present invention will be described below with reference to the accompanying drawings.
【００１０】図１は、マスク１の外面側の部分破断斜視
図、図２は、マスク１の内面側の斜視図、図３は、図１
の３−３線矢視図、図４は、図１の４−４線矢視図であ
る。FIG. 1 is a partially cutaway perspective view of the outer surface side of the mask 1, FIG. 2 is a perspective view of the inner surface side of the mask 1, and FIG.
3 is a view taken along line 3-3 of FIG. 4, and FIG. 4 is a view taken along line 4-4 of FIG.
【００１１】図１、２、３において、マスク１は、面体
５と、ろ過部６と、しめひも７とからなり、面体５とろ
過部６とは吸気弁８を介して通気可能に連結し、面体５
の下部には排気弁９がある。ろ過部６は、平面形状がほ
ぼ八角形であって、面体５側に位置する内蓋１０と、そ
の反対側に位置する外蓋１１と、内外蓋１０，１１に周
囲を挟圧された静電フィルターである着脱可能な取替え
式シート状ろ過材１２とからなる。外蓋１１は、不透明
な熱可塑性プラスチックでできており、着用者から見た
ときの内蓋１０の右側部にヒンジ機構１４を介して旋回
可能に取付けられ、内蓋１０に対し開閉可能であるとと
もに、閉じたときにはロックすることができる（ただし
そのためのロック機構は、図示していない）。内蓋１０
は、無色透明または着色透明の熱可塑性プラスチックで
できているが、透明な透視部１３を除くその他の部分に
はしぼ加工が施してある。これにより透視部１３におい
て、ろ過材１２と後記限度見本１５それぞれの裏面１２
Ｂ，１５Ｂを同時に透視可能であるが、その他の部分で
は殆ど透視することができない。1, 2 and 3, the mask 1 comprises a face piece 5, a filter portion 6 and a tie string 7, and the face piece 5 and the filter portion 6 are connected to each other through an intake valve 8 so as to be ventilated. , Face piece 5
There is an exhaust valve 9 in the lower part of the. The filtering unit 6 has a substantially octagonal planar shape, and has an inner lid 10 located on the side of the face piece 5, an outer lid 11 located on the opposite side, and a static pressure between the inner and outer lids 10 and 11 that are pressed against each other. It is composed of a detachable replaceable sheet-shaped filter material 12 which is an electric filter. The outer lid 11 is made of an opaque thermoplastic and is rotatably attached to the right side portion of the inner lid 10 through a hinge mechanism 14 when viewed from the wearer and can be opened and closed with respect to the inner lid 10. At the same time, it can be locked when closed (however, the locking mechanism therefor is not shown). Inner lid 10
Is made of a colorless transparent or colored transparent thermoplastic resin, but is grained in other portions except the transparent see-through portion 13. As a result, in the see-through part 13, the back surface 12 of each of the filter material 12 and the limit sample 15 described later is provided.
Although B and 15B can be seen through at the same time, almost no other parts can be seen through.
【００１２】図３は、内外蓋１０，１１を閉じてロック
したときのろ過部６の断面構造を示している。FIG. 3 shows a cross-sectional structure of the filtering portion 6 when the inner and outer lids 10 and 11 are closed and locked.
【００１３】内蓋１０は、図の上下それぞれに位置する
周壁部２０と、それらの内方にあってろ過材１２の全周
縁に内面側から当接可能な先端２１Ａがシャープエッジ
からなる第１当接部２１と、第１当接部２１の内方にあ
って、ろ過材１２の内面１２Ｂから所要距離Ｄだけ離れ
ている内側壁２２とからなり、内側壁２２のほぼ中央か
らは筒部２３が横方向に延出してその外周に面体５が気
密状態で嵌着し、さらにその筒部２３の先端には軟質ゴ
ムシートからなり、面体５側へのみ開くことが可能な吸
気弁８が取付けてある。内側壁２２の内面には、ろ過材
１２を支える複数の第１小突起２４が起立している。The inner lid 10 has a peripheral wall portion 20 located at the upper and lower sides in the drawing, and a first end 21A which is inwardly of the peripheral wall portion 20 and can abut against the entire peripheral edge of the filter medium 12 from the inner surface side is a sharp edge. The contact portion 21 and the inner side wall 22 inside the first contact portion 21 and separated from the inner surface 12B of the filter medium 12 by the required distance D are provided. 23 extends in the lateral direction, the face piece 5 is fitted to the outer periphery of the face piece 5 in an airtight state, and the tip of the cylindrical portion 23 is made of a soft rubber sheet, and an intake valve 8 that can be opened only to the side of the face piece 5 is provided. It is installed. On the inner surface of the inner wall 22, a plurality of first small protrusions 24 that support the filter medium 12 are erected.
【００１４】外蓋１１は、その外周を形成し、かつ、内
蓋１０の第１当接部２１とともにろ過材１２を全周にわ
たって挟圧可能な平坦なフランジからなる第２当接部２
５と、第２当接部２５の内方にあって、ろ過材１２の外
面１２Ａから離間する外側壁２６と、第２当接部２５と
外側壁２６とをつなぐ周壁部２７とからなり、周壁部２
７の所要部位には、外蓋１１の内外を貫通する外気取入
れ孔３０がある。また、外側壁２６の内面にはろ過材１
２を支える複数の第２小突起３１が起立している。図３
のように内外蓋１０，１１が閉じた状態のろ過材１２で
は、その全周が第１、２当接部２１，２５で挟圧された
状態にあり、かつ、内外面が第１、２小突起２４，３１
に支えられて揺れ動くことがない。なお、図３における
矢印は、空気の流路を示しており、外気は取入れ孔３０
から入って、ろ過材１２を通過し、吸気弁８を経て面体
５に入る。呼気は、排気弁９から外へ出る。The outer lid 11 forms the outer periphery thereof, and the second abutment portion 2 is formed of a flat flange that can press the filter material 12 together with the first abutment portion 21 of the inner lid 10 over the entire circumference.
5, an outer wall 26 located inside the second contact portion 25 and separated from the outer surface 12A of the filter medium 12, and a peripheral wall portion 27 connecting the second contact portion 25 and the outer wall 26, Perimeter wall 2
There is an outside air intake hole 30 penetrating the inside and outside of the outer lid 11 at a required portion of 7. Further, the filter material 1 is provided on the inner surface of the outer wall 26.
A plurality of second small protrusions 31 that support the 2 stand upright. FIG.
As described above, in the filter medium 12 in which the inner and outer lids 10 and 11 are closed, the entire circumference is in a state of being pressed by the first and second contact portions 21 and 25, and the inner and outer surfaces are the first and second surfaces. Small protrusion 24, 31
Being supported by, it does not shake. The arrow in FIG. 3 indicates the flow path of air, and the outside air is taken in through the intake hole 30.
After passing through the filter medium 12, it enters the face piece 5 through the intake valve 8. Exhaled air goes out through the exhaust valve 9.
【００１５】図４は、ろ過部６の右下隅部の構造の詳細
を示している。ろ過材１２の内面１２Ｂと内側壁２２と
の間には限度見本１５が挿入してあり、内蓋１０の透視
部１３の外側からろ過材１２の内面１２Ｂと見本１５の
内面１５Ｂとを同時に見ることができる。かかる見本１
５は、ろ過材１２の交換時期を適確に判断するための目
安になるものであって、実際に使用して交換時期が到来
したろ過材１２から切取った小片を、その内面１２Ｂを
透視部１３に向けてセットしたものである。セット後に
おいてその内面１２Ｂは、図４の内面１５Ｂとなる。ろ
過材１２は静電フィルターであって、粉じんの多くが深
層部で捕集され、捕集量が多くなるに伴いろ過材１２の
内面１２Ｂに粉じんの色が徐々にしみ出てくるから、そ
の色の程度を見本１５の内面１５Ｂの色と見比べて交換
の要否を適確に判断することができる。なお、内蓋１０
の仮想線で示す範囲には、しぼ加工が施してある。FIG. 4 shows the details of the structure of the lower right corner of the filter section 6. A limit sample 15 is inserted between the inner surface 12B of the filter medium 12 and the inner side wall 22, and the inner surface 12B of the filter medium 12 and the inner surface 15B of the sample 15 are simultaneously viewed from the outside of the see-through portion 13 of the inner lid 10. be able to. This sample 1
Reference numeral 5 is a guide for accurately determining the replacement time of the filter medium 12, and a small piece cut out from the filter medium 12 which has actually been used and the replacement period has come through the inner surface 12B thereof. It is set toward the part 13. After setting, the inner surface 12B becomes the inner surface 15B in FIG. The filter medium 12 is an electrostatic filter, and most of the dust is collected in the deep layer, and the color of the dust gradually exudes to the inner surface 12B of the filter medium 12 as the amount of the collected dust increases. By comparing the degree of color with the color of the inner surface 15B of the sample 15, the necessity of replacement can be accurately determined. The inner lid 10
The area shown by the phantom line is subjected to grain processing.
【００１６】ところで、ろ過材１２として使用する静電
フィルターは、通気性と圧縮性とを備えた厚さ２ｍｍ以
上の羊毛フェルトや不織布を基材にすることがあり、そ
れをろ過部６に取付けるときには、第１、２当接部２
１，２５でその基材を９０〜５０％の厚み（ｄ）にまで
圧縮して挟持することがある。一方、内側壁２２の距離
Ｄは、挿入した見本１５の厚みが第１当接部２１の先端
２１Ａを大きく越えることがなく、しかも、ろ過材１２
と内側壁２２との間で自由に動くことがない程度である
ことが好ましい。それには、基材が圧縮性であることを
考慮してＤをろ過材６の厚みの０．５〜１．５倍の範囲
におさめておくことが好ましい。かかるろ過材６の厚み
は、２０ｇｆ／ｃｍ2の面圧を加えて測定する。なお、
図４において見本１５は、その上下方向が内蓋１０の周
壁と第１小突起２４とに挟まれて上下方向に動くことが
ない。By the way, the electrostatic filter used as the filter material 12 may be made of wool felt or non-woven fabric having a thickness of 2 mm or more, which is breathable and compressible, as a base material, which is attached to the filtration part 6. Sometimes, the first and second contact portions 2
1, 25, the base material may be compressed and clamped to a thickness (d) of 90 to 50%. On the other hand, the distance D of the inner wall 22 is such that the thickness of the inserted sample 15 does not greatly exceed the tip 21A of the first contact portion 21, and the filter 12
It is preferable that it does not move freely between the inner wall 22 and the inner wall 22. For that purpose, it is preferable to keep D in the range of 0.5 to 1.5 times the thickness of the filter medium 6 in consideration of the compressibility of the base material. The thickness of the filter medium 6 is measured by applying a surface pressure of 20 gf / cm 2 . In addition,
In FIG. 4, the sample 15 does not move in the vertical direction because the sample 15 is sandwiched between the peripheral wall of the inner lid 10 and the first small protrusion 24 in the vertical direction.
【００１７】見本１５は、ろ過材１２の内面側に位置し
ているから、繰返し使用しても内面の色はそれ以上に変
わることがない。また、内蓋１０は、透視部１３を除い
て半透明または不透明にし、粉じんの色がしみ出たろ過
材１２が必要以上に見えることでマスク１の外観を損ね
ることがないようにしてあるが、もし好むなら内蓋１０
全体を透明にしてもよい。さらにはまた、内蓋１０の距
離Ｄを見本１５をセットする部位とその他の部位とで異
なるようにすることができる。Since the sample 15 is located on the inner surface side of the filter medium 12, the color of the inner surface does not change even after repeated use. Further, the inner lid 10 is made semitransparent or opaque except for the see-through portion 13 so that the appearance of the mask 1 is not spoiled by the filter material 12 exuding the color of dust being seen more than necessary. , Inner lid 10 if you like
The whole may be transparent. Furthermore, the distance D of the inner lid 10 can be made different between the site where the sample 15 is set and the other site.
【００１８】ろ過材１２を取替えるときは、ロックを解
いて外蓋１１を開けばよい。When the filter medium 12 is replaced, the lock can be released and the outer lid 11 can be opened.
【００１９】[0019]
【発明の効果】この発明においては、静電フィルターの
内面側にフィルター交換時期の判断の目安となる限度見
本をセットしたから、その判断が適確になり、ろ過材を
無駄にしたり、ろ過材を交換すべきマスクをそれと知ら
ずに無理に使用したりすることがない。According to the present invention, a limit sample is set on the inner surface of the electrostatic filter as a guide for determining the filter replacement time. Therefore, the determination becomes accurate and the filter material is wasted or the filter material is wasted. Do not forcibly use the mask to be replaced without knowing it.
【図１】取替え式防じんマスクの外面側の部分破断斜視
図。FIG. 1 is a partially cutaway perspective view of an outer surface side of a replaceable dust mask.
【図２】マスクの内面側の斜視図。FIG. 2 is a perspective view of the inner surface side of the mask.
【図３】図１の３−３線矢視図。FIG. 3 is a view taken along the line 3-3 of FIG.
【図４】図１の４−４線矢視図。FIG. 4 is a view taken along line 4-4 of FIG.
１ 防じんマスク ５ 面体 ６ ろ過部 ８ 吸気弁 ９ 排気弁 １０ 内蓋 １１ 外蓋 １２ ろ過材 1 Dustproof mask 5 Face piece 6 Filtration part 8 Intake valve 9 Exhaust valve 10 Inner lid 11 Outer lid 12 Filtering material
Claims (1)
備え、シート状の静電フィルターを交換可能に取付けて
使用する取替え式防じんマスクにおいて、 前記フィルターの外面周縁への当接部を有する外気取入
れ可能な外蓋と、前記フィルターの内面周縁への当接部
を有し、前記外蓋が着脱可能に係合するとともに前記面
体に通気可能に連結する内蓋とを設け、前記内外蓋の係
合によって前記フィルターをその周縁で挟圧可能につく
り、 前記内蓋を前記当接部より内方の少なくとも一部におい
て前記フィルターの内面から該フィルターの厚みの０．
５〜１．５倍の距離だけ離間させ、かつ、その一部を含
む所要の範囲を無色透明および着色透明のいずれかの素
材により構成してあることを特徴とする前記マスク。1. A replaceable dust mask comprising at least a face piece, an intake valve, and an exhaust valve, wherein a sheet-shaped electrostatic filter is replaceably attached and used, wherein a contact portion of the filter with an outer peripheral edge is provided. An inner lid that has an outer lid that can take in outside air and an inner lid that has an abutting portion on the inner peripheral edge of the filter and that is detachably engaged with the outer lid and that is ventilably connected to the face member is provided. By engaging the lid, the filter can be clamped at the peripheral edge thereof, and the inner lid is at least partially inward of the abutting portion from the inner surface of the filter to a thickness of 0.
The mask, wherein the mask is separated by a distance of 5 to 1.5 times, and a required range including a part thereof is made of a material of either colorless transparent or colored transparent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6178324A JP2896313B2 (en) | 1994-07-29 | 1994-07-29 | Replaceable dust mask |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6178324A JP2896313B2 (en) | 1994-07-29 | 1994-07-29 | Replaceable dust mask |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0838631A true JPH0838631A (en) | 1996-02-13 |
| JP2896313B2 JP2896313B2 (en) | 1999-05-31 |
Family
ID=16046498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6178324A Expired - Fee Related JP2896313B2 (en) | 1994-07-29 | 1994-07-29 | Replaceable dust mask |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2896313B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220026359A (en) * | 2020-08-25 | 2022-03-04 | 어메이징썬 주식회사 | Filter replaceable mask |
| WO2022131599A1 (en) * | 2020-12-15 | 2022-06-23 | 은익수 | Mask having large filtering surface, and side-opening bag-type filter therefor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018079207A (en) | 2016-11-18 | 2018-05-24 | スリーエム イノベイティブ プロパティズ カンパニー | mask |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6020249U (en) * | 1983-07-19 | 1985-02-12 | 北條 牛夫 | smoke mask |
| JP3021349U (en) * | 1995-02-17 | 1996-02-20 | 成夫 松本 | Simple home emergency light |
-
1994
- 1994-07-29 JP JP6178324A patent/JP2896313B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6020249U (en) * | 1983-07-19 | 1985-02-12 | 北條 牛夫 | smoke mask |
| JP3021349U (en) * | 1995-02-17 | 1996-02-20 | 成夫 松本 | Simple home emergency light |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220026359A (en) * | 2020-08-25 | 2022-03-04 | 어메이징썬 주식회사 | Filter replaceable mask |
| WO2022131599A1 (en) * | 2020-12-15 | 2022-06-23 | 은익수 | Mask having large filtering surface, and side-opening bag-type filter therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2896313B2 (en) | 1999-05-31 |
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