JP3785430B2 - Filter unit opening and closing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an opening / closing device capable of temporarily sealing a filter unit attached to a dustproof and / or gas mask on the atmosphere side.
[0002]
[Prior art]
The dust mask disclosed in Japanese Utility Model Publication No. 60-41243 has a fitting tester for judging whether the fitting state on the face of the wearer is good or bad. This tester has a valve body that opens and closes the intake port of the mask, and an operating lever that extends long upward from the valve body. It is possible to determine whether or not the mask is well fitted to the face by wearing a mask, lowering the lever and closing the intake port with the valve body and then breathing in.
[0003]
[Problems to be solved by the invention]
In the known mask, a tester is attached to the mask, and the filter is attached to the mask in front of the tester. Therefore, with this mask, even if it can be judged whether the airtightness between the mask and the face is good or bad, the quality of the airtightness between the mask and the filter cannot be judged. In this mask, the larger the opening area of the intake port of the mask, the larger the valve body, and the longer the operation lever. The longer operating lever protrudes to the outside of the mask so that it easily hits the surroundings and is often damaged.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is directed to the mask wearer's face by temporarily closing the front side of the intake port of the mask having either a dustproof or poisonous function in an airtight state. It is an open / close device that can check the contact state.
[0005]
In such an apparatus, the features of the present invention are as follows.
The apparatus is rotatably supported by the frame member via a rotation shaft and a frame member fixed from the front side to either a dustproof or poisoning filter unit attached to the front surface of the intake port of the mask. The frame member includes a lid member that covers the frame member from the outside , and the frame member is formed with at least one through hole that penetrates the frame member around the rotation shaft and communicates with the filter unit. The lid member includes a first part capable of closing the through hole in an airtight state and a second part capable of opening the through hole toward the outside air in accordance with a rotation angle of the lid member. Are formed on concentric circles around the rotation axis.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The details of the filter unit opening and closing apparatus according to the present invention will be described with reference to the accompanying drawings.
[0007]
FIG. 1 is a perspective view of a dust / gas mask 1 using a filter unit opening / closing device 5 according to the present invention. The mask 1 includes a face body 3 that is closely attached to the face of the wearer by the headband 2, a filter unit 4 that is detachably attached to the front side of the face body 3, and an open / close attached to the front side of the filter unit 4. Device 5. In the figure, the opening / closing device 5 has a vent 6 (see FIG. 4) opened, and a dust filter 7 can be seen inside the vent 6. Outside air enters through the vent hole 6, is filtered by the dust filter 7, and proceeds to the inside of the mask 3. The opening / closing device 5 can rotate the lid member 32 (see FIGS. 3 and 4) about the shaft 9 by moving the knob 36 in the direction of arrow A, and can close the vent hole 6. If such a mask 1 is worn, it can be determined prior to use of the mask 1 whether or not the mask 1 is in an airtight state by closing the vent hole 6 and breathing in.
[0008]
2 and 3 are a side view and a partially enlarged view of FIG. However, in FIG. 2, the filter unit 4 and the opening / closing device 5 are shown in a cross section along the line PQR. The face body 3 of the mask 1 has a front part 13 made of hard plastic and a rear part 14 made of soft elastic plastic. The front part 13 has an intake port 16 extending outward and an inner side of the intake port 16. An intake check valve (not shown) that can open toward the inside of the face piece 3 at an end, and an exhaust check that can be opened outwardly below the intake port 16. And an exhaust port 18 to which a valve 17 is attached. The rear part 14 is greatly open so that the wearer's mouth and nostril can be covered.
[0009]
The filter unit 4 includes an absorption can 19 as a gas filter located near the face body 3 and a sheet-like dust filter 7 in close contact with the front side of the absorption can 19. However, the filter unit 4 can also be used with the dust filter 7 removed from the absorber 19. The absorption can 19 is composed of a hard container made of metal or plastic, and an adsorbent 21 filled therein. The rear end portion of the absorption can 19 is screwed into the air inlet 16 of the face piece 3 in an airtight state so as to be removable from the front, and a plurality of vent holes 23 are formed on the rear end surface. The front end portion of the absorption can 19 protrudes forward from the air inlet 16 of the face piece 3, and a plurality of vent holes 24 are formed on the front end face, and the vent holes 24 are covered with the dust filter 7. The dust filter 7 is fixed to the front end surface of the absorption can 19 by the action of the opening / closing device 5.
[0010]
The opening / closing device 5 includes a frame member 31 positioned at the front end portion of the absorption can 19 and a lid member 32 positioned in front of the frame member 31. The cover member 32 has the shaft portion 9 inserted into the shaft hole 34 of the frame member 31, and can rotate around the shaft portion 9. In order to facilitate the rotation, a knob 36 is formed on the peripheral edge of the lid member 32. An O-ring 37 for maintaining airtightness is interposed between the shaft portion 9 and the peripheral surface of the shaft hole 34.
[0011]
The frame member 31 of the opening / closing device 5 has a front portion 38 having a conical shape and a rear portion 39 having a cylindrical shape, and a shaft hole 34 is formed at the center of the front portion 38. As is apparent from FIG. 3, an annular first raised portion 41 and an annular second raised portion 42 located outside the annular portion are formed on the inner surface of the outer peripheral edge of the front portion 38. The first raised portion 41 is pressed against the peripheral edge of the dust-proof filter 7 from the front to fix the filter 7 to the front surface of the absorption can 19. The 2nd protruding part 42 is press-contacted to the peripheral part of the absorption can 19 in the airtight state from the front. The rear portion 39 of the frame member 31 is fitted to the front end portion of the absorption can 19, and a claw 46 formed radially inward on the inner peripheral surface of the rear portion 39 extends in the circumferential direction on the peripheral surface of the absorption can 19. It press-contacts to the level | step-difference part 47 from back (right side of FIG. 2). Thus, the frame member 31 is strongly abutted against the peripheral portion of the absorption can 19 by the first and second raised portions 41 and 42 and the claw 46 from the front and rear direction, and is substantially fixed to the absorption can 19 when the mask 1 is used. Is in a state.
[0012]
The lid member 32 of the opening / closing device 5 has a shaft portion 9 and a peripheral edge portion 49, and an inner end portion of the shaft portion 9 has a retaining claw 50 that comes into contact with the peripheral edge of the inner end portion of the shaft hole 34 from the rear. Is formed. The peripheral portion 49 has a flat second small protrusion 52 that is intermittently formed in the circumferential direction of the lid member 31 and extends radially inward.
[0013]
4 and 5 are plan views of the opening / closing device 5, and FIG. 4 corresponds to the state of the device 5 in FIG. FIG. 5 is a partially broken plan view of the device 5 when the lid member 32 is rotated in the direction of arrow A with the gripping portion 36 of FIG. As is apparent from FIG. 5, the frame member 31 is intermittently provided along the outer peripheral edge portion with a plurality of first ventilation holes 61 formed at equal intervals on a concentric circle centering on the shaft portion 9 of the lid member 32. The first small protrusion 51 (see FIG. 2) that is formed outwardly and extends radially outward, and a rib 64 that is formed at the peripheral edge of the first vent hole 61. 1, 2 stoppers 66 and 67 are formed. The lid member 32 includes a plurality of second through holes 62 formed at equal intervals on a concentric circle centered on the shaft portion 9, and an intermediate portion 68 formed between the second through holes 62 and 62. Have. The first through hole 61 and the second through hole 62 are substantially the same shape and size, and when the gripping portion 36 is in contact with the first stopper 66, the positions of both the through holes 61 and 62 are the same. In agreement, the vent hole 6 of the opening / closing device 5 is formed as shown in FIGS. When the gripping portion 36 located between the first and second stoppers 66 and 67 rotates to a position where it comes into contact with the second stopper 67, the lid member 32 in FIG. The first ventilation hole 61 of the frame member 31 can be closed. That is, the lid member 32 can open and close the first through hole 61 corresponding to the rotation angle.
[0014]
FIG. 6 is a partial cross-sectional view of the opening / closing device 5. (A) is the VI-VI arrow directional view in FIG. 4, and shows the state of the frame member 31 and the cover member 32, (b) shows the cover member 32 in the arrow A direction (FIG. 1, FIG. 4)). In the figure (a), the positions of the first and second vent holes 61 and 62 coincide with each other, the vent hole 6 is formed in the opening / closing device 5, and the mask wearer can breathe freely. In FIG. 5B, the first ventilation hole 61 of the frame member 31 is closed in an airtight state by the intermediate portion 68 of the lid member 32. The intermediate portion 68 is a portion that is brought into close contact with the peripheral edge portion of the first vent hole 61 so as to close the first vent hole 61 in an airtight state. An inclined surface 71 is formed on the top of the rib 64 in the frame member 31 and has an upward slope in the rotation direction A when the lid member 32 is closed. In addition, an inclined surface 72 having an inclination similar to that of the inclined surface 71 of the rib 64 is formed on the surface of the lid member 32 facing the frame member 31. When the lid member 32 rotates in the direction of arrow A in (a), the inclined surface 72 of the lid member 32 slides on the inclined surface 71 of the frame member 31 so that the inclined surfaces 71 and 72 are in close contact with each other. The frame member 31 and the lid member 32 are adjusted so that the inclined surfaces 71 and 72 can be in close contact with each other.
[0015]
7 is a cross-sectional view taken along line VII-VII in FIG. A second small protrusion 52 extending radially inward is formed on the peripheral edge of the lid member 32 so that the inclined surfaces 71 and 72 are in close contact with each other when the first vent hole 61 is closed (FIG. 2). See also). When the lid member 32 closes the first ventilation hole 61, the second small protrusion 52 comes into pressure contact with the first small protrusion 51 of the frame member 31 from behind the mask 1.
[0016]
In the mask 1 to which the opening / closing device 5 acting in this way is attached, when the lid member 32 is rotated and the first ventilation hole 61 of the frame member 31 is closed, the portion in front of the intake port 16 becomes airtight. Therefore, if the worn mask 1 is set in this airtight state and inhaled, it can be easily and reliably determined whether or not the contact between the mask 1 and the wearer's face is in a good airtight state. The first vent hole 61 can directly open to the outside air with the area of the front surface of the filter unit 4 being approximately ½ as an upper limit. The size of the lid member 32 for closing the open area is constant regardless of the size of the open area. The gripping portion 36 for rotating the lid member 32 is positioned between the first and second stoppers 66 and 67 of the frame member 31, so that the gripping portion 36 hits a surrounding object inadvertently. Guarded to prevent movement or damage.
[0017]
The opening / closing device 5 is such that the rear portion 39 of the frame member 31 can be elastically deformed in the radial direction. When the opening / closing device 5 is pulled leftward with respect to the face body 3 in the state of FIGS. 46 is disengaged from the stepped portion 47 of the absorption can 19, and the opening / closing device 5 can be separated from the filter unit 4. When the separated opening / closing device 5 is pressed against the filter unit 4, the frame member 31 is elastically deformed and fitted into the unit 4, and the state shown in FIGS.
[0018]
The opening / closing device 5 according to the present invention seals the first ventilation hole 61 of the frame member 31 by the lid member 32, and the inclined surfaces 71 and 72 formed so as to be able to press-contact with the frame member 31 and the lid member 32. The first and second small protrusions 51 and 52 are examples of means for ensuring such sealing. The present invention can be practiced by omitting these means or employing other means instead of these means. In the illustrated example, the opening / closing device 5 that can be attached to and detached from the absorption can 19 may be detachable from the filter unit other than the absorption can 19 and the face body 3 to which the filter unit is attached. Furthermore, the opening / closing device 5 may be made non-removable with respect to the filter unit such as the absorption can 19 or the face body 3 to which the filter unit is attached.
[0019]
【The invention's effect】
The filter unit opening and closing device according to the present invention can check the quality of the airtight state of the mask worn by closing the vent hole of the filter unit attached to the mask body. It is possible to easily find a defect in airtightness and an airtightness between the face and the mask wearer's face.
[Brief description of the drawings]
FIG. 1 is a perspective view of a mask to which an opening / closing device is attached.
FIG. 2 is a PQR arrow view of FIG.
FIG. 3 is a partially enlarged view of FIG. 2;
FIG. 4 is a plan view of an opening / closing device having a through hole.
FIG. 5 is a partially cutaway plan view of an opening / closing device in which a through hole is closed.
FIG. 6 is a partial cross-sectional view of the switchgear. (A) shows the VI-VI line cross section of FIG. 5, (b) shows the state which the cover member rotated in (a).
7 is a view taken along line VII-VII in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mask 4 Filter unit 5 Opening and closing device 7 Filter 9 Shaft 16 Air inlet 19 Filter 31 Frame member 32 Cover member 41 1st protruding part 42 2nd protruding part 51 1st protrusion part (1st small protrusion)
52 2nd protrusion (2nd small protrusion)
61 Through-hole 62 Second part 68 First part 71 Inclined surface 72 Inclined surface

Claims (4)

In the opening and closing device capable of checking the close contact state of the mask with the face of the wearer by temporarily closing the front side of the intake port of the mask having a dustproof or poisonous function in an airtight state,
The apparatus is rotatably supported by the frame member via a rotation shaft and a frame member fixed from the front side to either a dustproof or poisoning filter unit attached to the front surface of the intake port of the mask. The frame member includes a lid member that covers the frame member from the outside , and the frame member is formed with at least one through hole that penetrates the frame member around the rotation shaft and communicates with the filter unit. The lid member includes a first part capable of closing the through hole in an airtight state and a second part capable of opening the through hole toward the outside air in accordance with a rotation angle of the lid member. Are formed on concentric circles around the rotation axis.   When the lid member rotates in the direction of closing the through hole, there is an inclined surface that can slidably contact with each other from the rotation direction around the through hole of the frame member and the first portion of the lid member. The apparatus of claim 1 being formed.   The lid member is disk-shaped and has a second protrusion inward in the radial direction at the outer peripheral edge, and the lid member has an outer peripheral edge that defines a circle of the frame member. When the first projection is rotated in the direction in which the through hole is closed, the second projection extends radially outward so that the first portion is brought into close contact with the periphery of the through hole. The apparatus according to claim 1, comprising:   The filter unit is at least one of a dust filter and a gas filter, and the inner side of the frame member can be in close contact with the peripheral portion of the dust filter so that the inner side can be kept airtight. The apparatus in any one of Claims 1-3 in which at least one of the cyclic | annular 1st protruding part and the cyclic | annular 2nd protruding part which can be contact | adhered to the peripheral part of the said gas-proof filter is formed.

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