JPH09192246A - Dust protective mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a detachable filter unit from loosening in being used and improve reliability by inserting/drawing a tube part of a filter unit in/out from a ring receiver seat which constitutes a mask body and engaging a movable ring member constituting the receiver seat with the tube part inserted by rotational moving. SOLUTION: A dust protective mask comprises a mask body covering the mouth and the circumference of the nostril, and a filter unit 3, and the mask body is provided with a filter unit receiver seat 7. This receiver seat 7 is constituted of a ring member 55 and a movable ring member 56 rotating in its circumferential direction and a fixed ring member 55 is provided with four recessed parts 58 arranged in the equal interval in the circumferential direction and four engaging jaws 60. The movable ring member 56 is provided with a plurality of operation projection parts 64 formed around the outer circumference of the circumferential wall 61 and four recessed defective parts 59 arranged in the equal intervals in the circumferential direction in the inside wall of the top 62, The tube part 16 of the filter unit 3 is inserted in ring members 55, 56 and locked in such a state as prevented being pulled out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust mask, and more particularly to a dust mask suitable for use in a radiation controlled area such as a nuclear power plant.

[0002]

2. Description of the Related Art A well-known dust mask 101 shown in a partially exploded view in FIG.
02 and a disposable filter unit 103 detachable from the face body 102. The facepiece 102 is
It has a face opening member 102A, a lace 104, a voice transmitter 105, and an exhaust valve (not shown) covered with a cover member 106,
It has filter unit receiving seats 107 on both left and right sides. The receiving seat 107 is connected to the face member 10 through the central opening 108.
2A has a thread (not shown) inside the cylindrical peripheral wall 109 so as to be able to ventilate. Filter unit 10
Reference numeral 3 denotes a disk shape, and the end peripheral wall 111 can be screwed inside the peripheral wall 109. Although not shown, a well-known filter paper filter having a large number of concentric pleats is attached inside the filter unit 103.

When such a mask 101 reaches a reference condition such as a use time determined according to the use environment, the filter unit 103 is replaced with a new one.

[0004]

In a radiation control area such as a nuclear power plant, a dust mask is worn to prevent inhalation of radioactive dust. The dust mask 101 of the prior art described above is an example of what can be used for that purpose, but this mask has the following problems. (1) If shock or vibration is applied to the filter unit 103 while using the dust mask 101, the filter unit 1
There is a risk that the attachment of 03 will be loosened, and a gap will be created between it and the receiving seat 107, and outside air that has not been filtered will be sucked. (2) The dust mask 101 used in the control area is
After removing the filter unit 103, the face body 102 is washed, and the remaining radioactivity is measured to confirm that radioactive dust is not attached, and then used again. Such cleaning and measurement become easier as the shape of the face piece 102 becomes simpler. However, in the case of the conventional dust mask 101, the receiving seat 107 is fixed to the face-opening member 102A by a small part of the relatively large back face, and between the remaining portion of the back face and the face-opening member 102A. A gap 107A is created. Such a gap 1
07A, the surface of the face-opening member 102A and the receiving seat 10
Cleaning and measuring the back of 7 requires a lot of time and effort because the gap is narrow.

In view of the above, the present invention is intended to prevent the attached filter unit from being loosened and to facilitate cleaning and measurement of a face piece in a dust mask having a high collection efficiency which can be used in a radiation controlled area. I have an issue.

[0006]

In order to solve the above-mentioned problem, in the present invention, a face body capable of covering at least a mouth and a periphery of a nostril of a wearer and a filter unit detachable from the face body are provided. It is assumed that a dustproof mask is used.

[0007] Under such a premise, the face body has a face opening member made of a soft elastic material and first engaging means for attaching the filter unit, while the filter unit is capable of filtering and taking in outside air. And a second engagement means extending from the filtration chamber and capable of being disengaged from the first engagement means, wherein the first engagement means comprises a first annular member and a second annular member. Wherein the first annular member has a base end peripheral edge fixed to the face member, the second annular member has substantially the same outer diameter as the first annular member, and the first annular member The first and second annular members form a conduit which allows ventilation between the inside and the outside of the face opening member, while the second engagement means is provided with the conduit. Is inserted and removed from the outside of the face opening member, and when inserted A tubular body capable of maintaining an airtight state with a road, and a portion to be engaged with the second annular member formed on an outer wall of the tubular body, wherein the second annular member includes (2) When the second annular member rotates in a required direction with respect to the first annular member after insertion of the engaging means, the second annular member contacts the engaged portion to prevent the second engaging means from being pulled out. A feature of the present invention is that an engaging portion that can be formed is formed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of a dust mask according to the present invention will be described below with reference to the accompanying drawings.

A dustproof mask 1 shown in a partially exploded perspective view in FIG. 1 is composed of a face body 2 and a filter unit 3, and the face body 2 is formed by a face opening member 2A and a filter unit receiving seat 7. In addition, the lace 104 and the voice transmitter 10 are similar to the dust mask 101 of the prior art shown in FIG.
5. It has an exhaust valve (not shown) covered by the cover member 106. The face / mouth member 2A is made of a soft elastic material, covers the mouth of the wearer and the periphery of the nostrils, and has a peripheral edge in close contact with the face. The receiving seat 7 has a cylindrical shape made of a hard plastic, and is irremovably attached to a peripheral portion of an intake hole 15 formed on both left and right sides of the face opening member 2A. The intake hole 15 has a rib structure 15A formed of hard plastic, and a check valve for intake (not shown) is mounted inside the structure 15A.

The filter unit 3 has a disk shape,
Tubular portion 1 extending from the back side toward face opening member 2A
6 can be inserted into and removed from the receiving seat 7, and when inserted, the space between the receiving seat 7 and the receiving seat 7 is airtight. At the time of such insertion, a plurality of projections 17 extending radially outward on the outer wall of the tubular portion 16 fit into a plurality of axial grooves G formed inside the peripheral wall of the receiving seat 7. Next, as described later, when the outer wall portion of the receiving seat 7 is rotated in the direction of the arrow P with the raised portion 64 on the outside thereof, the filter unit 3 cannot be removed from the receiving seat 7. To remove the unit 3, the outer wall portion of the receiving seat 7 is rotated in a direction opposite to the arrow P, and then is removed from the receiving seat 7.

FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and a part of the receiving seat 7 is indicated by a virtual line. The filter unit 3 includes sheet-like front and rear filter media 21 and 22 that are arranged vertically in parallel in the drawing,
It comprises a spacer 23 for keeping the filter media 21 and 22 at a required separation distance, and front and rear cover members 24 and 25 for covering the two filter media 21 and 22, respectively.

The spacer 23 is a molded product of a hard plastic and has a cylindrical peripheral wall 26 and a porous top 27, and the front filter medium 21 is placed on the top 27. The back filter media 22 is below the spacer 23.

The front cover member 24 has a front portion 29, a plurality of ribs 29A radially disposed on the inner surface of the front portion 29 and hanging therefrom, and a peripheral wall portion 30. There is a vent hole 31 that communicates with the inside and outside of 24.

The back cover member 25 has a back portion 32, a plurality of protrusions 32A extending upward from the inner surface of the back portion 32, and a peripheral wall portion 33. One side of the back portion 32 has inside and outside of the cover member 25. On the other side of the back surface 32 facing the ventilation hole 35, there is the tubular portion 16 for attaching the filter unit 3 to the face body 2.

The front and rear cover members 24, 25 are integrally joined to a pair of notches formed at the opposing edges of the peripheral wall portions 30, 33. In such a joined state, the front cover member 24 is attached to the peripheral portion of the inner surface of the front portion 29 and the rib 2.
9A presses the front filter medium 21 with the upper edge 26A of the peripheral wall 26 of the spacer 23 and the porous top 27 so as not to displace. In addition, the back cover member 2
5 presses the rear filter medium 22 so that the peripheral portion of the inner surface of the rear portion 32 and the lower edge portion 26B of the peripheral wall 26 of the spacer 23 do not shift, and the protrusion 32A of the rear portion 32 and the rear portion ventilation hole The top of the concave portion 37 in which 35 is formed supports the back filter medium 22 so as not to hang down.

The tubular portion 16 has an outer diameter smaller than that of the back cover member 25 and is formed integrally with the back cover member 25 so as to pass through the inside and outside of the back portion 32.
An inner end (upper end in the figure) 41 of the tubular portion 16 penetrates the back filter medium 22 through a through-hole 42 formed near the periphery thereof, and an outer end (lower end) portion 43 extends from the back surface 32 to the face opening. It extends toward the receiving seat 7 of the member 2A. The back surface filtering material 22 is pressed against the step portion 44 formed at the outer periphery of the tubular portion 16 at the peripheral portion of the through hole 42 by the ring member 45 press-fitted to the outer periphery of the tubular portion 16, and abuts in an airtight state. . The tubular portion 16 has an O-ring 45 below the pawl 17.

The front and back filtration materials 21 and 22 are subjected to resin processing on a base sheet in which 100% by weight of organic fibers such as wool felt, synthetic fiber non-woven fabric, and wool / synthetic fiber non-woven fabric are used as fiber components. It is preferable to use an electrostatic filter obtained by charging the toner, and it is particularly preferable to use wool felt.

The filter unit 3 thus constructed
Then, the front and rear filter media 21 and 22 and the spacer 23
And form an outside air filtration chamber 50 that is closed to the outside air and that can take in the outside air only through the filtering media 21 and 22.
The outside air filtration chamber 50 is connected to the face member 2A through the tubular portion 16 so as to be able to ventilate. When the dust mask 1 to which the filter unit 3 is attached is worn, the intake air flows from the front of the unit 3 in the direction of arrow C and from the back in the direction of arrow D to enter the filtration chamber 50, and further flows in the direction of arrow E to be worn. Reaches the mouth and nostrils of the person.

FIG. 3 is a perspective view of a part of the filter unit 3 and the receiving seat 7 attached to the face member 2A, but the illustration of the filter structure 15A of the intake hole 15 (see FIG. 1) is omitted. I have. Four protrusions 17 are formed at equal intervals in the circumferential direction on the outer wall of the tubular portion 16 of the filter unit 3, and a part 51 </ b> A of the upper surface 51 of the protrusion 17 has a downward taper in the figure.

The receiving seat 7 is cylindrical and has a face opening member 2.
A, an annular member 55 having a base end peripheral edge fixed to A;
A movable annular member 56 having substantially the same outer diameter as that of the member 55 and slidingly contacting the member 55 from the outside, and being rotatable around the member 55, is formed by the two members 55 and 56.
A pipe 54 is formed to allow air to pass through the inside and outside of the pipe.

The fixed annular member 55 is formed by cutting out the inner wall of the upper end 57 thereof, and has four recesses 58 arranged at equal intervals in the circumferential direction, and extends upward and has equal intervals in the circumferential direction. And four locking claws 60 provided.

The movable annular member 56 includes a peripheral wall 61 and a top 62
A plurality of operation raised portions 64 are formed on the outer periphery of the peripheral wall 61, and four concave notches 59 arranged at equal intervals in the circumferential direction on the inner wall of the top portion 62, and the top portion 62 is vertically It has four through holes 65 that penetrate and extend in the circumferential direction. A step portion 66 extending in the circumferential direction is formed in the through hole 65.

As shown in the figure, the two annular members 55 and 56 slidingly contacting each other.
Then, the respective concave notches 58 and 59 are aligned, and the pipe 54
A groove G extending in the axial direction is formed, and the locking claw 60 is slidably contacted with the stepped portion 66 of the annular member 56 from above, thereby preventing the member 56 from being detached from the member 55. The movable annular member 56 rotates in the direction of the arrow P when a finger is applied to the raised portion 64, and the side end of the locking claw 60 abuts on the end wall 69 of the through hole 65, and the rotation is stopped. The concave notch 59 of the movable annular member 56 thus rotated moves to a position indicated by a virtual line,
The concave notch 58 of the member 55 has a movable annular member 56
Is closed by the top portion 62 of the rim. In addition, as described later, the protrusion 17 of the filter unit 3 fits into the groove G from the direction of the arrow.

FIG. 4 is an enlarged view taken along the line IV-IV of FIG. 3, and shows a state before the filter unit 3 is mounted, and FIG. 4B shows a state after the filter unit 3 is mounted. . The outer diameter of the tubular portion 16 of the filter unit 3 is formed such that it can be inserted into and removed from the fixed and movable annular members 55 and 56.
The tubular portion 16 is fitted into the groove G from the
Comes into contact with the inner peripheral surface tapered portion 71 of the fixed annular member 55 and stops, and the state shown by the phantom line in FIG. next,
When the movable annular member 56 rotates in the P direction (see FIG. 3),
The top 62 closes the recess 58, and the state shown in FIG. The top portion 62 has a lower surface passing through the tapered upper surface 51A of the protrusion 17 (see FIG. 3) and abutting on the upper surface 51 so that the filter unit 3 cannot be removed from the receiving seat 7. The upper surface is in contact with the back surface 32 of the filter unit 3 with almost no gap. The top portion 62 presses the projection 17 downward, and the O-ring 45 is in close contact with the tapered portion 71 on the inner peripheral surface of the fixed annular member 55, so that the space between the filter unit 3 and the receiving seat 7 is airtight. . To remove the filter unit 3, the movable annular member 56 is rotated in the direction opposite to the arrow P.

The movable annular member 56 can moderately increase the resistance at the time of rotation so that it does not move unintentionally. By doing so, the attachment of the filter unit 3 becomes more reliable.

[0026]

According to the dust mask thus constructed, the attached filter unit does not come loose or come off unless the movable annular member is operated.
Therefore, there is no possibility of air leakage even when shock or vibration is applied to the filter unit. Further, since the cylindrical receiver remains on the face after the filter unit is removed, there is no gap between the face member and the receiver, which makes cleaning and measurement difficult, unlike the prior art.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view of a dust mask with a part disassembled.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a perspective view of a part of a filter unit and a receiving seat.

4A and 4B are cross-sectional views taken along line IV-IV of FIG. 3, wherein FIG. 4A shows a state before the filter unit is fitted, and FIG. 4B shows a state after the filter unit is fitted.

5 is a drawing similar to FIG. 1 of a prior art dust mask.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dust prevention mask 2 Face body 2A face mouth 3 Filter unit 7 1st engagement means (reception seat) 16 2nd engagement means (tubular part) 17 Projection 21,22 Filtration material 50 Filtration chamber 54 Pipe line 55 First annular member (Fixed annular member) 56 Second annular member (movable annular member) 58 Groove (concave notch) 59 Groove (concave notch) 62 Top G groove

Front page continued (72) Inventor Akira Otsuka 7-4 Yonbancho, Chiyoda-ku, Tokyo Koken Stock Company (72) Inventor Yasuhiro Hirao 7-4 Yonbancho, Chiyoda-ku, Tokyo Koken Stock Company

Claims (2)

[Claims] 1. A dust mask comprising a face body capable of covering at least the mouth and the periphery of a nostril of a wearer, and a filter unit detachable from the face body, wherein the face body is made of a soft elastic material. And first engagement means for attaching the filter unit.
The filter unit has an outside air filtration chamber capable of filtering and taking in outside air, and a second engagement means extending from the filtration chamber and capable of being disengaged from the first engagement means. 1 engaging means comprises a first annular member and a second annular member, the first annular member having a base end peripheral edge fixed to the face opening member, and the second annular member comprising the first annular member. And has an outer diameter substantially the same as that of the first and second annular members.
An annular member forms a conduit that allows ventilation between the inside and outside of the face opening member, and the second engagement means is inserted into and removed from the outside of the face opening member into and out of the face opening member. And a portion to be engaged with the second annular member formed on the outer wall of the tubular body, wherein the second annular member includes the second member. When the second annular member rotates in a required direction with respect to the first annular member after the insertion of the engagement means, it is possible to prevent the second engagement means from coming off by contacting the engaged portion. The mask, wherein a possible engaging portion is formed. 2. The first and second annular members extend on the inner walls of their respective overlapping tops in the axial direction of the conduit while being aligned with each other when the second annular member is at a required rotational position. A plurality of grooves are formed, and the engaged portion of the second engaging means is a projection intermittently arranged in a direction around the outer wall of the tubular body, wherein the tubular body is inserted into the conduit. Then, when the protrusion is fitted into the groove, and the second annular member is rotated in the required direction, the top of the member comes into contact with the engaged portion as the engagement portion, and the second engagement member is engaged. 2. The mask according to claim 1, wherein the mask can be prevented from coming off.