JPH1199214A - Dustproof mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate insertion and withdrawal of a filter unit to the face body of a dustproof mask. SOLUTION: In a dustproof mask 1 consisting of a face body 2 and an attachable/detachable filter unit 3, an annular seat 7 constituting the face body 2 is formed so as to be able to insert and withdraw a cylindrical inserting part 16 of the filter unit 3. A rotatable annular member constituting the seat 7 is energized in the peripheral direction. When the annular member is rotated against the energization under a condition where the hooking projection 17 of the filter unit 3 is fitted to the recessed cut part 21 of the annular member, the hooking projection 17 of the filter unit 3 is moved to the first recessed part of the cylindrical member fixed on the face body 2 from the recessed cut part and the annular member is rotated in the above described energizing direction to prevent the filter unit 3 from 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. 9 is composed of a face member 102 for covering the periphery of a mouth and a nostril of a wearer, and a disposable filter unit 103 detachable from the face member 102. ing. Facepiece 102
Is a face member 102A, a lace 104, a voice transmitter 10
5. It has an exhaust valve (not shown) covered with a cover member 106, and has a filter unit receiving seat 107 on each of the left and right sides. The receiving seat 107 is connected through the central opening 108 to the inside of the face opening member 102A so as to be able to ventilate, and the cylindrical peripheral wall 1
09 has a thread (not shown) inside. The filter unit 103 has a disk shape, and the inner 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 pleats formed concentrically is attached inside the filter unit 103.

When the 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 controlled area such as a nuclear power plant, a dust mask having a high collection efficiency is worn so as not to inhale radioactive dust. The above-mentioned conventional dust-proof mask 101 is one example that can be used for that purpose, but this mask has the following problems. (1) When impact or vibration is applied to the filter unit 103 while the dust mask 101 is being used, the filter unit 1
03 may be loosened and a gap may be formed between the receiving seat 107 and the receiving seat 107 to suck in unfiltered outside air. However,
This problem has been solved by the dust mask disclosed in Japanese Patent Application Laid-Open No. 9-192246. (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. Such washing and measurement become easier as the shape of the face body 102 becomes simpler. However, in the case of the conventional dust mask 101,
The receiving seat 107 is fixed to the face member 102A at a small portion of the relatively large back face, and a gap 107A is formed between the remaining part of the back face and the face piece member 102A. In such a gap 107A, cleaning and measuring the surface of the face member 102A and the back surface of the receiving seat 107 include:
As the gap is narrow, it takes a lot of time and effort. This problem has also been solved by the mask disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 9-192246. (3) When replacing the filter unit 103 for a large number of dust masks 101, the unit 1
The work of tightening and loosening 03 takes a lot of work. It is difficult to solve this problem with the mask disclosed in JP-A-9-192246.

Accordingly, the present invention is directed to a dust mask which can be used in a radiation control area.
In particular, it is an object of the present invention to provide a dust collecting mask having a high collection efficiency capable of solving the problem that it takes time to replace a filter unit.

[0006]

In order to solve the above-mentioned problems, 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] On this premise, the features of the present invention are as follows. The face body has a face member made of a soft elastic material, and first engagement means capable of inserting and removing the filter unit, wherein the filter unit is capable of filtering and taking in outside air. A second extending outwardly from the chamber and insertable into and removable from the first engagement means;
And engagement means. The first engaging means has a cylindrical member and an annular member, and the cylindrical member has a base end, which is one end in the axial direction, fixed to the face member, and the annular member is The free end portion is fitted to the free end portion of the cylindrical member opposite to the base end portion from the outside, and is formed to be rotatable around the cylindrical member under spring bias. And an annular end wall that covers the free end surface and extends along the edge of the peripheral wall.
The cylindrical member and the annular member which are fitted to each other form a conduit which allows ventilation inside and outside the face opening member.
A cylindrical insertion portion which is removably inserted into the conduit and can be connected to the conduit in an airtight manner, and wherein the second engagement means is inserted in an outer surface of a longitudinally intermediate portion of the insertion portion; And a plurality of engaging projections intermittently arranged in a direction around the portion. A plurality of recessed portions through which each of the engagement protrusions can pass when the insertion portion is inserted are formed in an inner peripheral edge portion of an end wall of the annular member in the first engagement means,
A concave portion capable of accommodating each of the engagement protrusions passing through the concave notch is formed on an end surface of the cylindrical member. The cylindrical member and the annular member are arranged such that when the annular member is rotating in the circumferential direction under the bias of the spring, the concave notch and the concave are not aligned in the insertion direction of the insertion portion. When the annular member rotates in a direction against the bias of the spring, the recessed portion and the recessed portion are arranged so that they can be aligned.

[0008] In one preferred embodiment of the present invention, the outer peripheral surface of the annular member extends radially outward of the annular member, and rotates the annular member against the bias of the spring. The arm part which can be used when moving is formed.

In another preferred embodiment of the present invention, one end is fixed to an outer peripheral surface of a free end of the cylindrical member, and a free deformable portion which is an end opposite to the one end is formed of the outer peripheral surface. The free deformable portion of the elastic band-shaped member extending in a direction substantially tangential to the surface is elastically deformed in a direction approaching the outer peripheral surface and is engaged with the arm portion from the inside of the annular member. An annular member is biased in the rotation direction.

In still another preferred embodiment of the present invention, the arm is hollow, and a freely deformable portion of the elastic band-like member extends into the hollow arm.

[0011]

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.

The dust mask 1 shown in a partially exploded perspective view in FIG. 1 is composed of a face body 2 and a filter unit 3. The face body 2 has a face opening member 2 A and a filter unit receiving seat 7, Prior art dust mask 101 (FIG. 9)
(See FIG. 2), an exhaust valve (not shown) covered with a cord 104, a voice transmitter 105, and a cover member 106. The face opening member 2A is formed 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 is a cylindrical shape made of a hard plastic, and is attached to a peripheral portion of an intake hole 15 formed on each of the left and right sides of the face opening member 2A. The intake hole 15 has a rib structure 15A made of hard plastic, and the structure 1
A check valve for intake (not shown) is attached to the inner end of 5A.

The filter unit 3 has a disk shape,
The cylindrical insertion portion 16 extending from the rear surface side receives the receiving seat 7.
Can be inserted into and removed from the inside, and when it is inserted, the O-ring 10 is connected to the receiving seat 7 in an airtight state.
At the time of such insertion, a plurality of engaging projections 17 arranged in the circumferential direction on the outer peripheral surface of the insertion portion 16 and extending radially outward.
Fits in the recess 21 formed in the receiving seat 7. Next, when the projection 17 is lightly pressed against the receiving seat 7 from the insertion direction and the filter unit 3 is rotated in the direction of the arrow P,
The filter unit 3 is attached to the receiving seat 7 in a state where it cannot be removed. To remove the unit 3, the operation arm 20 of the receiving seat 7 is rotated in the direction of arrow P.

FIGS. 2 to 5 are a partially broken plan view of the receiving seat 7 and a sectional view taken along the line III-III, IV-IV and VV, respectively. Indicated by The illustration of the face member 2A to which the receiving seat 7 is fixed and the rib structure 15A are omitted. The receiving seat 7 includes a cylindrical member 11 having a base end 8A fixed to the face opening member 2A via a rib structure 15A;
An annular member 12 is fitted to the free end 8B of the cylindrical member 11 from outside.

The cylindrical member 11 has inner and outer peripheral surfaces 18A, 18A.
B and a free end end surface 19, and a first concave portion 22 that opens inward in the radial direction of the cylindrical member 11 around the cylindrical member 11 is provided on the end surface 19 at intervals of 90 °. (See FIGS. 2 and 4). The end face 19 is formed with one second concave portion 23 which opens outward in the radial direction of the cylindrical member 11. The base end 26A of the band-shaped leaf spring 26 is fitted in the second recess 23 so as not to be pulled out radially outward. From the end face 19, four engaging portions 27 extend in the axial direction of the cylindrical member 11, and these engaging portions 27 are arranged on the same circumference at intervals of 90 ° (FIGS. 2, 5). reference).

The annular member 12 has a peripheral wall 31 covering the outer peripheral surface 18B of the free end 8B of the cylindrical member 11, and an annular end wall extending along the edge of the peripheral wall 31 and covering the free end end surface 19. 32 having a substantially annular shape. Peripheral wall 31
The operating arm 20 extends substantially tangentially from the front. The arm portion 20 is formed hollow so as to accommodate the leaf spring 26. In the inner peripheral edge of the end wall 32, four concave notches 21 are formed at intervals of 90 °, and four circumferentially long through holes 33 are formed at intervals of 90 ° on the same circumference between the inner and outer peripheral edges. Are formed at intervals. Such an annular member 1
Reference numeral 2 denotes a state in which the cylindrical member 11 is rotatably fitted to the free end 8B of the cylindrical member 11 in a direction around the end 8B.
2 and 5, the engaging portion 27 extends through the through hole 33 to the outer surface 32A of the end wall 32, and the engaging claw 27A at the distal end overlaps the outer surface 32A. The removal of the fitted annular member 12 is prevented. When the annular member 12 rotates, the side walls 33A, 33 of the through hole 33 are rotated.
At least one of B may slide on the side surface of the engagement portion 27. The rotation range of the annular member 12 is restricted by the contact between the end walls 33C and 33D of the through hole 33 and the engagement portion 27. The first concave portion 22 of the cylindrical member 11 and the concave notched portion 23 of the annular member 12 are displaced from each other in the circumferential direction, and are in an inconsistent state. Outer peripheral surface 1 of cylindrical member 11
A leaf spring 26 having a proximal end 26A fixed to the outer peripheral surface 8B extends tangentially to the outer peripheral surface and has a free deformable portion 26 at the distal end.
B is curved in a direction away from the outer peripheral surface 18B. The free deformable portion 26B is formed on the side wall 20A forming the arm 20.
, And urges the annular member 12 to rotate clockwise.

The cylindrical member 11 and the annular member 12 fitted to the cylindrical member 11 form a pipe which allows air to flow inside and outside the face opening member 2A. Is inserted and removed.

FIG. 6 is a cross-sectional view taken along the line VI-VI of 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 back filter materials 321 and 322 that are arranged vertically in parallel in the drawing.
And a spacer 323 for keeping the filter media 321 and 322 at a required separation distance, and two filter media 321 and 3
Front and back cover members 324,
325, and a cylindrical insertion portion 16 extends from the back cover member 325 toward the receiving seat 7. The four engagement projections 17 formed on the outer peripheral surface of the insertion portion 16 are arranged in a circumferential direction at intervals of 90 °.

The spacer 323 is a molded product of a hard plastic, and has a cylindrical peripheral wall 326 and a porous top surface 3.
27, and the front filter medium 321 is placed on the top surface 327 thereof. The back filter 322 is a spacer 32
3 is located below.

The front cover member 324 includes a front portion 329.
And a plurality of ribs 329 </ b> A radially arranged on the inner surface of the front part 329 and hanging therefrom, and a peripheral wall part 330.
A vent 331 communicating with the inside and outside is formed at the center of 29.

The back cover member 325 includes a back portion 332.
And a plurality of protrusions 33 extending upward from the inner surface of the back portion 332
2A, a peripheral wall portion 333, and a vent hole 335 communicating with the inside and outside.

Front and back cover members 324, 325
Are integrally joined at the respective notches formed in the peripheral wall portions 330 and 333. The peripheral edge portion of the front cover member 324 and the rib 329A, together with the peripheral wall 326 and the top surface portion 327 of the spacer 323, press the front filter medium 321 so as not to be displaced. Further, the peripheral portion of the rear cover member 325 and the peripheral wall 326 of the spacer 323 press the rear filter medium 322 so as not to be displaced. Projection 33 of back cover member 325
Concave portion 33 in which 2A and rear air hole 335 are formed
7 supports the back filter medium 322 so as not to hang down.

The insertion portion 16 has an outer diameter smaller than that of the back cover member 325, and penetrates the inside and outside of the back cover member 325. An inner end (upper end in the figure) portion 341 of the insertion portion 16 penetrates the through hole 342 of the back filtration material 322. In the back filter 322, the periphery of the through hole 342 is in airtight contact with a step 344 formed on the outer periphery of the insertion portion 16. The insertion portion 16 has the O-ring 10 below the locking projection 17.

The front and back filtration materials 321 and 322 are subjected to resin processing on a base sheet in which 100% by weight of organic fibers such as wool felt, synthetic fiber nonwoven fabric, and wool / synthetic fiber nonwoven 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 configured as described above
In the above, the front and rear filter media 321 and 322 and the spacer 323 are sealed from the outside air,
1 and 322, an outside air filtration chamber 350 capable of taking in outside air only is formed, and the outside air filtration chamber 35 is inserted through the insertion portion 16.
0 is connected to the face opening member 2A in a permeable manner. When the dust mask 1 to which the filter unit 3 is attached is worn,
The intake air flows from the front surface of the unit 3 in the direction of arrow C and from the rear surface in the direction of arrow D, enters the filtration chamber 350, flows further in the direction of arrow E, and reaches the mouth and nostrils of the wearer.

FIGS. 7 and 8 are a plan view when the annular member 12 is rotated in the counterclockwise direction indicated by an arrow P in FIG. 2 and a sectional view taken along the line VIII-VIII.
The rotated annular member 12 is attached to both ends 33C, 3 of the through hole 33.
One end 33C of the 3D is in contact with the engaging portion 27, and the rotation in the counterclockwise direction is stopped. The recessed portion 21 of the annular member 12 and the first recessed portion 22 of the cylindrical member 11 are in an aligned state where their positions match each other. While the annular member 12 rotates from the state shown in FIGS. 2 to 7, the free deformable portion 26B of the leaf spring 26 is pressed against the inner surface of the peripheral wall 31 of the annular member 12 and elastically approaches the cylindrical member 11. Deform. As a reaction to the deformation, the annular member 12 is urged to rotate clockwise and return to the state of FIG. Therefore, by holding the arm 20 with a finger so that the annular member 12 does not return in the clockwise direction, the insertion portion 16 of the filter unit 3 can be inserted into and removed from the receiving seat 7. When the insertion portion 16 is inserted, the four engagement protrusions 17
Pass through the concave notch 21 of the annular member 12 and fit into the first concave portion 22 of the cylindrical member 11, and the projection 17
The insertion of the insertion portion 16 is stopped by contacting the bottom surface 22A of the concave portion 22. Since the thickness T of the projection 17 is slightly smaller than the depth F of the first concave portion 22, when the finger is released from the arm portion 20, the annular member 12 rotates clockwise, and the annular member 12
The end wall 32 covers the projection 17 to prevent the insertion portion 16 from being pulled out of the receiving seat 7, and the filter unit 3 is attached to the face body 2 (see FIGS. 4 and 8). In the filter unit 3, since the position of the insertion portion 16 is eccentric, if any one of the engagement protrusions 17, the concave portion 21 used for the protrusion 17 and the first concave portion 22 are particularly large. Thus, the attachment state of the filter unit 3 to the face opening member 2A becomes constant.

The filter unit 3 may be mounted on the face member 2A in this manner, but can be mounted more easily by the following operation procedure. Leaf spring 26
The annular member 12 which is rotating clockwise by the action of is in the state of FIGS. The face opening member 2A in this state is held by one hand, and the front cover member 324 of the filter unit 3 is held by the other hand. The insertion portion 16 includes the engagement protrusion 1.
7 is housed in the concave notch 21 of the annular member 12 and the cylindrical member 1
1 until it comes into contact with the end face 19. Next, when the front cover member 324 is rotated counterclockwise as indicated by the arrow P, the side surface 17A of the engagement protrusion 17 is
1A is pressed, and the annular member 12 is turned counterclockwise against the bias of the spring, and the state shown in FIG. 7 is obtained. Here, if the filter unit 3 is lightly pressed toward the face member 2A, the engagement protrusion 17 moves from the concave notch 21 to the first concave 22 to release the pressing against the side wall 21A. The operation of 26 immediately returns to the state of FIGS. 1 and 2, and the filter unit 3 cannot be removed (see FIG. 4). According to this procedure, the front cover member 324 held in one hand is rotated by about 90 ° and pressed lightly to complete the installation of the filter unit 3. Normally, front cover member 3
24 is made to be small enough to fit in the palm of an adult, so it is extremely easy to operate it with it.

To remove the filter unit 3 from the face body 2, a fingertip is applied to the arm 20, and the annular member 12 is
May be rotated against the urging of the first recess 22 to align the recess 21 with the first recess 22. The arm portion 20 includes a front cover member 32
4 can be extended to the vicinity of the periphery thereof, so that the operation can be performed without inserting the fingertip between the filter unit 3 and the face body 2 too deeply.

In the present invention, the leaf spring 26 for urging the annular member 12 can be replaced with a coil spring or another elastic member. However, the leaf spring 26 has
There is an advantage that the external shape can be reduced and the structure can be simplified. Cylindrical member 11, annular member 12, leaf spring 2
6. For the insertion portion 16, a thermoplastic synthetic resin can be used.

[0030]

According to the dust mask of the present invention, the filter unit, which is held in one hand, can be attached to the face opening member by inserting the filter unit into the receiving seat and slightly rotating the filter unit in a required direction, for example, about 90 °. Therefore, the mounting operation is not troublesome.

To remove the attached filter unit,
Since the relatively large operation arm formed on the receiving seat may be pressed in a required direction, the operation for removing the operation arm does not require much trouble.

[Brief description of the drawings]

FIG. 1 is a partially exploded perspective view of a dust mask.

FIG. 2 is a partially broken plan view of a first engagement member.

FIG. 3 is a view showing a cross section taken along line III-III of FIG. 2;

FIG. 4 is a view showing a section taken along line IV-IV of FIG. 2;

FIG. 5 is a view showing a section taken along line VV of FIG. 2;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 1;

FIG. 7 is a view similar to FIG. 2 when the annular member is rotated.

FIG. 8 is a view showing a section taken along line VIII-VIII of FIG. 7;

FIG. 9 is a partially exploded perspective view of a conventional 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) 8A Base end 8B Free end 11 Cylindrical member 12 Annular member 16 Insertion part 17 Engagement projection 20 Arm 20A Free end Part 21 concave notch part 22 concave part (first concave part) 26 elastic member (leaf spring) 26A end part 26B free deformation part 31 peripheral wall 32 end wall 50 filtration chamber

Claims (4)

[Claims] 1. A dust mask comprising: 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, wherein the face body is made of a soft elastic material. A member, and a first engagement means to which the filter unit can be attached and detached, wherein the filter unit is an outside air filtration chamber capable of filtering and taking in outside air, and the filter unit extends outward from the filtration chamber, The first engaging means has a detachable second engaging means, the first engaging means has a cylindrical member and an annular member, and the cylindrical member has a cylindrical axial direction. A base end, which is one end, is fixed to the face opening member, and the annular member is fitted from the outside to a free end of the cylindrical member opposite to the base end, and is biased by a spring. The lower part is formed so as to be rotatable around the cylindrical member, A peripheral wall that covers the outer peripheral surface of the portion, and an annular end wall that covers the free end surface and extends along the edge of the peripheral wall. A cylindrical insertion portion which forms a pipe which allows ventilation between the inside and the outside, wherein the second engagement means is removably inserted into the pipe and can be connected to the pipe in an airtight manner; A plurality of engagement protrusions intermittently arranged in a peripheral direction of the insertion portion on an outer surface of an intermediate portion in the axial direction of the insertion portion, and an end wall of the annular member in the first engagement means. At the inner peripheral edge, a plurality of recessed portions through which each of the engagement protrusions can pass when the insertion portion is inserted are formed, and the end surface of the cylindrical member passes through the recessed portion. A concave portion capable of accommodating each of the engaging protrusions is formed, and the cylindrical member and the annular member When the annular member is rotating in the spring biasing direction, the concave notch and the recess are not aligned in the insertion direction of the insertion portion, and the annular member resists the spring bias. The dust mask is arranged so that the concave portion and the concave portion can be brought into an aligned state when rotated. 2. An arm extending from a peripheral wall outer surface of the annular member radially outward of the annular member and usable when rotating the annular member against the bias of the spring. The dust mask according to claim 1, wherein a dust mask is formed. 3. An elastic belt-like shape in which one end is fixed to an outer peripheral surface of a free end of the cylindrical member, and a free deformable portion which is an end opposite to the one end extends substantially in a tangential direction of the outer peripheral surface. Since the free deformable portion of the member is elastically deformed in a direction approaching the outer peripheral surface and is engaged with the vicinity of the arm from the inside of the annular member, the annular member is urged in the rotating direction. The dust mask according to claim 2, wherein the dust mask is formed. 4. The dust mask according to claim 3, wherein the arm is hollow, and a free deformable portion of the elastic band-shaped member extends into the hollow arm.