JP2022007931A5 - - Google Patents

Description

The present invention relates to a working face mask used for work in an environment where dust is scattered, such as polishing work.

The face mask that prevents the suction of dust during work and protects the eyes has a transparent front surface (lens surface) that does not obstruct the vision, and is suitable for work purposes so as not to inhale dust and harmful gas to the human body. It is provided with a filter so that exhalation during respiration is performed through the filter. Further, since the work is hindered when the lens surface becomes fogged, these face masks are provided with an anti-fog mechanism (Patent Documents 1, 2 and 3).

For example, a face mask in which a goggle portion and a mask portion are combined (Patent Documents 1 and 2), and a face mask in which a mask portion for breathing is provided inside a transparent face protection portion (= goggles portion) that covers the entire face (Patent Documents). In 3), the air intake during breathing is made to pass through the goggles portion, and fresh outside air is always introduced into the goggles portion to realize the antifogging of the lens surface.

That is, the intake air during breathing passes through the attached or attached filter and enters the goggles portion, enters the mask portion from the goggles portion via the check valve, and becomes the intake air of the mask wearer there. The exhaled air is directly discharged from the mask portion through the exhaust valve (check valve) to the outside air.

Further, the above face mask needs to cover the face widely and to be in close contact with the face, and the face masks disclosed in Patent Documents 1 and 2 are provided with two upper and lower wearing belts for wearing the goggles and the mask. The face mask disclosed in Patent Document 3 also has two upper and lower wearing belts.

Further, since the mask portion is attached to the mouth and nose portion in a sealed state, for example, in Patent Document 2, the outer peripheral portion (face contact portion) of the cup-shaped mask portion is formed of soft resin in order to further improve the adhesion. Further, Patent Document 4 discloses a mask formed of a cushion material formed by folding the outer edge portion of the mask portion into a U shape.

Further, it is disclosed in Patent Document 5 that when the goggles are worn, the goggles are provided with a holding structure of the spectacle body (with the strings removed) in the goggles as a means for dealing with the case where the goggles user wants to use the spectacles. ing.

Japanese Unexamined Patent Publication No. 59-156356. Japanese Unexamined Patent Publication No. 11-290473. Jikkai Sho 60-55455. Japanese Unexamined Patent Publication No. 2018-89158. Utility model registration No. 3192425.

The conventional face mask with anti-fog function described above has a configuration in which the intake air during breathing once passes through the goggles portion. For this reason, in the work face mask shown in Patent Document 1, it is necessary to separately provide a filter portion at a position behind the head and connect it to the goggles portion with a ventilation pipe. It gets in the way when working. Further, as shown in Patent Document 2, in the configuration in which the goggles portion is provided with the ventilation holes directly provided with the filter, the goggles portion itself is bulky and the weight increases, and the view of the goggles portion is aimed at making it compact. Becomes narrower. Further, in a face mask in which a filter portion is attached to a face protection portion (= goggles portion) that covers the entire face like the work face mask shown in Patent Document 3, the entire mask has a multiple structure and the entire mask is bulky. It ends up.

Further, as a means for ensuring airtightness when the mask portion is attached, the outer edge portion (screen contact portion) of the mask portion is formed of a cushion member, but the goggle portion is used as in the work face masks shown in Patent Documents 1 and 2. In the device in which the mask portion and the mask portion are combined and connected, the sealing of the partition portion is particularly required to prevent the backflow of exhaled breath. However, even if a cushion member is used for the outer edge of the mask portion, the shape of the bridge of the nose varies from person to person, and the airtightness cannot always be ensured.

Therefore, the present invention first proposes a work face mask having a simple structure, having an anti-fog function, and being formed compactly as a whole.

The working face mask according to claim 1 of the present invention is provided with an elastic edge portion that is in close contact with the front lens surface and the upper portion of the face, does not have an outside air introduction structure, and covers the upper portion of the face in a sealed state. The goggle part to be worn and the mask part having a shape that covers the nose part and the mouth part in a closed state and having a vent hole provided with a filter on the front surface are provided in the space when the mask part is worn and the goggle part. A work face mask with a head-mounted portion that allows the wearing time space to be partitioned and integrated by a predetermined partition, and the goggles and mask to be attached to the face while maintaining a sealed state. An anti-fog ventilation part equipped with a valve body made of a film body that closes by increasing the pressure inside the mask part due to exhalation to prevent the exhaled air from entering the goggles part and opens in response to the decrease in pressure inside the mask part due to intake air is provided. It is characterized by being.

Further, the working face mask according to claim 2 of the present invention is further provided with a discharge portion provided with a check valve for discharging exhaled air and closing it at the time of inspiration.

Therefore, this face mask is used for work in a dusty environment such as polishing work, and when it is attached to the worker's face with the head mounting part, the worker's eyes, nose, and mouth are goggles. And the mask portion, and the worker's breathing is performed through the ventilation hole provided with the filter provided in the mask portion, and particularly when the discharge portion is provided (the invention according to claim 2). Most of the exhaled air is released from the discharge part to the outside air, which makes the exhalation easier. Therefore, all of the intake air is performed through the filter, the filter function prevents the suction of dust and the like into the human body, and the goggles protect the eyes.

Further, anti-fog on the lens surface of the goggles portion of this face mask is performed by air circulation in the anti-fog ventilation portion. The inside of the mask and the goggles naturally coincide with the atmospheric pressure, but the pressure inside the mask fluctuates due to breathing. In the inspiration, the pressure in the mask portion decreases, and in the exhalation, the pressure in the mask portion increases. That is, the outside air flows into the mask portion by the intake air, and the air in the goggles portion pushes out the valve body formed of the film body and flows out into the mask portion as the pressure in the mask portion decreases due to the suction resistance of the filter. Further, the pressure inside the mask portion naturally becomes the outside air pressure from the end of the inspiratory operation to the start of the next exhalation. With the return of the pressure inside the mask to the atmospheric pressure, the valve body made of the film body also naturally returns to the normal position (valve opening closed position). Air (outside air that has flowed into the mask portion) flows into the goggles portion by the time of the return.

Further, when the air pressure in the mask portion increases due to the start of exhalation, the valve body of the anti-fog ventilation portion closes to prevent the exhaled air having high humidity from entering the goggles portion. Therefore, a part of the air in the goggles portion is replaced with the outside air with each breath, and the fogging of the lens surface is prevented by repeating the partial replacement of the air in the goggles portion.

Further, in the work face mask according to claim 5 of the present invention, in the above-mentioned work face mask, the peripheral portion of the mask portion, which is the face contact portion, is formed of a rubber-like folded cushion material and serves as a partition portion. The upper part of the mask part is formed in a triangular shape that covers the nose part in a sealed state, and the folded portion of the triangular top is cut off on the face contact side of the triangular part, and the top folded portion including the cut portion is cut. A mountain-shaped non-breathable mask is attached to the part by loosening the lower edge part.

Therefore, the curtain body adheres to the nasal bridge part when this face mask is attached, and it is possible to respond to individual differences in the shape of the nasal bridge, which cannot be handled by the cushion material alone. It ensures that the invasion of exhaled air into the goggle space during use is surely prevented.

The configuration of the present invention is as described above, and it is possible to realize the simplification and miniaturization of the work face mask provided with the goggles portion having the anti-fog function.

Explanatory drawing of 1st Embodiment of this invention (front view of use state). The same figure (rear view). The same figure (partial perspective view of the lower part). In the explanatory diagram of the air flow during the same breathing, (a) shows the state at the time of exhalation (b) at the time of inspiration, and (c) the state from the end of inspiration to the start of exhalation. In the cross-sectional view of the ventilation portion, (a) is an exploded view (b) and (c) is when the valve is closed (c) is when the valve is open. Explanatory drawing of the second embodiment (front view of use state). The same figure (rear view). In the same main part diagram (partition part), (a) shows a rear view (b) and a rear downward perspective. Cross-sectional view at the time of the same mounting. In the cross-sectional view of the ventilation portion, (a) indicates when the valve is closed and (b) indicates when the valve is closed. Explanatory drawing when using the same glasses.

Next, an embodiment of the present invention will be described. 1 to 5 are shown in the first embodiment of the present invention, and the working face mask is composed of a goggle portion 1, a mask portion 2, a head mounting portion 3, and a mask portion urging mechanism portion 4.

The goggle portion 1 has a shape that covers the upper portion of the face A, has a lens surface 11 on the front surface, the lens surface 11 is held by the lens frame portion 12, and a portion of the lens frame portion 12 that is in close contact with the face is appropriate. The elastic edge portion 13 formed of the cushion material is used, and the belt connecting portions 14 are provided at both ends of the lens frame portion 12.

The mask portion 2 has a front triangular cylinder shape so as to cover the nose portion and the mouth portion in a sealed state as compactly as possible, and has a covering frame portion 21 formed of a rubber material having a folded shape around the peripheral portion serving as a face contact point. The intake portion 22 provided on the front surface of the covering frame portion 21, the discharge portion 23, the anti-fog ventilation portion 24, and the belt mounting portion (which constitutes the urging mechanism portion) 25 are provided.

The covering frame portion 21 has a front triangular tubular shape, and the goggles portion 1 and the mask portion 2 have a “dogleg” shape in the vertical direction with the triangular top portion 211 intruding into the lower center portion of the lens frame portion 12 of the goggles portion 1. It is flexibly connected and integrated in a "shape" so that the space for wearing the mask portion 2 and the space for wearing the goggles portion 1 are partitioned by the triangular top portion 211 as a partition portion.

The intake portion 22 is formed by providing a ventilation hole 221 of an appropriate size on the front surface of the covering frame portion 21 and closing the ventilation hole 221 with a filter (nonwoven fabric of a predetermined mesh or the like) 222 to prevent the passage of dust and the like. Is what you are doing.

The discharge portion 23 is provided on the side surface portion of the covering frame portion 21, and a valve body (check valve) 232 formed of a film is arranged on the outside of the ventilation hole 231 and is opened by the pressure inside the mask portion 1 at the time of exhalation. It is in a state and is sealed at the time of inhalation.

The anti-fog ventilation portion 24 is provided in the center of the partition portion (triangular top portion) 211, and is composed of a ventilation hole portion 241 and a valve body 242. The ventilation hole portion 241 delivers the crosspiece 244 to an appropriate ventilation hole 243, projects the valve body mounting shaft 245 inward of the mask portion 2 to the crosspiece 244, and makes the outer edge of the ventilation hole 243 the crosspiece. It is formed by providing an edge portion 246 protruding from the shaft 245 in the same manner as the shaft 245.

The valve body 242 is a silicon resin film body that is often used for work masks, and is mounted on the valve body mounting shaft 245 with a through hole in the central portion so as to fit in the edge portion 246. be. Therefore, in response to the pressure change in the mask portion 1, the valve body 242 rolls up to open the ventilation hole 243, or is pressed in the direction of the crosspiece 244 to close the ventilation hole 243. Further, in an environment where the pressures of the inner and outer spaces (the inner space of the goggles portion 1 and the inner space of the mask portion 2) are the same, the valve body 242 naturally closes the ventilation hole 243, but the valve body 242 is lightweight. Since it is a film body, it is difficult to completely seal the ventilation hole 243 by being in close contact with the crosspiece 244 in a natural state, and due to the necessity of the operation of the valve body 242, it is very small between the periphery of the valve body 242 and the edge 246. It suffices as long as it can be sealed by the valve body 242 to the extent that the function of the antifogging ventilation portion 24 is not substantially hindered, such as the need to provide a gap x.

The head mounting portion 3 is a mounting belt mounted on the goggles portion 1, and a base end is connected to the belt connecting portion 14 of the goggles portion 1, and an appropriate connecting member for connecting the belts to each other is provided on the other end side. It is something that is.

The mask portion urging mechanism portion 4 is composed of a rubber band 41 having one end connected to the belt mounting portion 25 of the mask portion 2 and the other end connected to the belt connecting portion 14 of the goggles portion 1. Is pulled in the direction of the goggles portion 1 so that the mask portion 2 is urged to form a "dogleg" shape with respect to the goggles portion 1.

Therefore, this mask is used for work in a dust environment such as polishing work, and the face A is covered with the integrated goggles portion 1 and the mask portion 2, and the wearing belt (head mounting portion) 3 is used. Tighten and attach the goggles portion 1 and the mask portion 2 to the face in close contact with each other.

In particular, since the mask portion 2 is urged toward the back surface (face direction) by the rubber band 41, when the goggles portion 1 is brought into close contact with the face A, the mask portion 2 also naturally comes into close contact with the face. Therefore, by attaching the face mask to the head with the wearing belt 3, the goggles portion 1 and the mask portion 2 are closely attached to the face.

When the mask is attached to the face A, the operator's breathing is such that the outside air passes through the intake unit 22 and enters the closed space inside the mask unit 2 at the time of inspiration, and is discharged from the intake unit 22 and the exhaust unit 23 at the time of exhalation. During this breathing, the filter 222 blocks dust and the goggles 1 protect the eyes.

In particular, the anti-fog of the lens surface 11 of the goggles portion 1 is realized by the ventilation of the anti-fog ventilation portion 24 due to the pressure change in the mask portion 2 during respiration.

At the time of inspiration, the filter 222 of the intake unit 22 acts as a resistance for introducing outside air, so that the pressure in the space inside the mask portion decreases, and the pressure inside the mask portion increases in the exhalation. That is, at the time of exhalation, the valve body (check valve) 232 of the discharge portion 23 is pushed out by the increase in the pressure inside the mask portion to open the discharge portion 23, and the exhaled breath is rapidly discharged from the space inside the mask portion (FIG. 4). I).

Then, when the intake operation is performed next, the pressure inside the mask portion is reduced by the intake a, the discharge portion 23 is closed, and the outside air b is sucked from the intake portion 22 into the space inside the mask portion. At the same time, the space inside the mask portion is decompressed, so that the anti-fog ventilation portion 24 is greatly opened, and the air c in the goggles portion 1 is sucked toward the space inside the mask portion (FIG. 3b). During the period from the end of the intake operation or the state immediately before the end to the exhalation operation, the outside air b flows into the space inside the mask portion in the decompressed state, and the outside air b is ventilated from the space inside the mask portion until the valve body 242 returns to the normal state. (Fig. 3c), it flows into the goggles portion 1 (inflow flow d). When the pressure difference between the space inside the goggles and the space between the masks is small and the valve body 242 returns to the natural state, the air inside the mask leaks into the goggles from the above-mentioned minute gap x and the air pressure inside the goggles increases. It becomes the outside air pressure.

Further, when the exhalation operation is reached and the exhalation e is discharged into the space inside the mask portion, the pressure in the space inside the mask portion rises, and the discharge portion 23 quickly opens and is discharged to the outside air f. A part of the air is discharged from the intake unit 22 (FIG. 3a). In the anti-fog ventilation portion 24, the valve body 242 is pressed toward the crosspiece 244 by the pressure increase due to the exhalation of the space inside the mask portion, the ventilation hole portion 241 is closed, and the exhalation e is prevented from flowing into the goggles portion.

Therefore, the air in the goggles portion 1 flows out (sucked as inspiration) every time the air is inhaled, and the outflow portion flows in until the start of exhalation. Since the exhaled air is not introduced into the goggles portion 1 and a part of the air in the goggles portion 1 is replaced with the outside air every time the breath is performed, the lens surface 11 is not fogged.

6 to 11 show the second embodiment of the present invention, and in the second embodiment, the goggles portion 1a, the mask portion 2a, the head mounting portion 3, and the mask portion are urged as in the first embodiment. It is composed of a mechanism unit 4a (the same reference numerals as those in the first embodiment indicate the same structure).

The goggle portion 1a is provided with a lens surface 11, a lens frame portion 12, an elastic edge portion 13, and a belt connecting portion 14, and in particular, a notch portion 15 for eyeglasses is provided at an inner edge portion on both sides of the goggle portion in the elastic edge portion 13. In addition, the locking rod 16 constituting the urging mechanism portion 4a is vertically hung from both side ends of the goggles portion.

The mask portion 2a includes a covering frame portion 21a, a breathing portion 22a, a ventilation portion 24a, and a belt mounting portion (which constitutes the urging mechanism portion 4a) 25.

In the covering frame portion 21a, a folded portion on the back surface of the top side of the triangular top portion 211 is cut off, and a non-breathable curtain body 212 is provided in the cut portion. The curtain body 212 is folded back so that the lower edge is particularly loosened. It is attached to the part (Fig. 8).

Since the breathing unit 22a has the same configuration as the intake unit 22 of the first embodiment and does not include the exhaust unit 23, all the exhalation and inspiration are made to pass through the breathing unit 22a.

The anti-fog ventilation portion 24a is provided in the center of the partition portion (triangular top portion) 211, and is composed of the ventilation hole portion 241a and the valve body 242a. The ventilation hole portion 241a is formed by passing a crosspiece 244a to an appropriate ventilation hole 243a, providing a valve body mounting hole in the crosspiece 244a, and forming a valve seat surface 247 on the outer peripheral edge of the ventilation hole 243a. ..

The valve body 242a has a valve shaft 242c projecting from the center of a thin film body 242b made of silicon resin, and the valve shaft 242c is fitted into a valve body mounting hole and attached.

In particular, the film body 242b is formed in a concentric stepped shape having the same thickness to ensure appropriate shape retention, and is attached and mounted so that the outermost outer peripheral surface of the film body 242b abuts on the valve seat surface 247. In the natural state at that time (when there is no fluctuation in the internal and external pressure), the valve seat surface 247 and the valve body outer peripheral surface are in contact with each other and the ventilation hole 243a is completely closed.

The urging mechanism portion 4a of the mask portion is composed of a rubber band 41 having one end connected to the belt mounting portion 25 of the mask portion 2 and the other end connected to a locking rod 16 suspended from the goggles portion 1. The mask portion 2 is pulled toward the face of the portion 2 to urge the goggles portion 1 to form a “dogleg” shape.

Thus, in the same face mask as in the first embodiment, the face A is covered with the goggles portion 1a and the mask portion 2a, and the wearing belt (head mounting portion) 3 is fastened, so that the goggles portion 1a and the mask portion 2a are used. Is attached to the face in close contact with the face to perform a predetermined operation.

Since the face mask of the second embodiment also has the urging mechanism portion 4a like the face mask of the first embodiment, the goggles portion 1a and the mask portion 2a are closely attached to the face, and the operator's breathing at the time of attachment is achieved. Due to the pressure change in the space inside the mask portion due to the above, ventilation is performed in the ventilation portion 24a to prevent fogging of the lens surface 11 of the goggles portion 1a.

The operation of the anti-fog ventilation unit 24a that exerts the anti-fog function is basically the same as that of the first embodiment. That is, at the time of exhalation, the exhaled air passes through the breathing part 22a and is released to the outside air, but since there is a passage resistance by the breathing part 22a, the pressure inside the mask part becomes higher than the pressure in the space inside the goggles part, so that the valve body 242a The film body 242b of the above is pressed toward the goggles portion, and the invasion of exhaled air into the goggles portion space is surely prevented (FIG. 11a).

Then, when the inspiratory operation is performed, the pressure inside the mask decreases during inspiration and the outside air enters the space inside the mask through the breathing portion 22a, but the pressure drop is particularly large at the start of breathing, so the valve body 242a opens. A part of the air in the space inside the goggles is sucked into the space inside the mask at once (suction flow g). Then, while the intake operation is continuous, in particular, the film body 242c has a concentric stepped cross section, and it takes some time to return from the bent state (state under pressure) to the natural state. By the time the space inside the mask portion gradually returns to atmospheric pressure due to the intrusion of outside air, the air in the space inside the mask portion flows into the space inside the goggles portion from the open ventilation hole 243a (inflow flow h) (FIG. 10b).

Therefore, a part of the air in the goggles portion 1a is replaced each time the air is taken in, and the air is completely blocked by the ventilation portion 24a at the time of exhalation, so that the exhaled air with moisture is not introduced into the goggles portion 1, so that the lens surface 11 Does not become cloudy.

In particular, in the second embodiment, since the non-breathable curtain body 212 is provided on the back surface of the triangular top portion 211 of the covering frame portion 21a on the top side, the curtain body 212 is in close contact with the user's nose bridge portion when the face mask is attached. Therefore, a part of the exhaled air does not leak into the goggle portion space at the time of exhalation, and there is no risk of fogging the lens surface 11.

Further, in the second embodiment, since the notches 15 for spectacles are provided inward on both sides of the elastic edge portion 13 of the goggles portion 1a, as shown in FIG. 11, the temple C of the spectacles B is provided. When the spectacles B is locked in the notch groove 15 for spectacles, the spectacles B can be stably mounted in the goggles portion 1a, and when the face mask is worn, the vine (temple) C is sandwiched between the face and the elastic edge portion 13, and the goggles portion. The airtightness of the space is ensured.

1,1a Goggles part 11 Lens surface 12 Lens frame part 13 Elastic edge part 14 Belt connecting part 15 Notch part for eyeglasses 16 Locking rod 2,2a Mask part 21,21a Covering frame part 211 Triangular top (partition part)
212 Non-breathable curtain 22 Intake part 22a Breathing part 221 Ventilation hole 222 Filter 23 Discharge part 231 Ventilation hole 232 Valve body (check valve)
24, 24a Ventilation part 241,241a Ventilation part 242a, 242b Valve body 242c Valve shaft 243, 243a Ventilation hole 244, 244a Bar mounting shaft 245 Valve body mounting shaft 246 Edge part 247 Valve seat surface 25 Belt mounting part (urgency mechanism part) )
3 Head mounting part (wearing belt)
4,4a Erasing mechanism 41 Rubber band

Claims (5)

It has an elastic edge that is in close contact with the front lens surface and the upper part of the face, and the goggle part that covers the upper part of the face and is worn in a sealed state without an outside air introduction structure, and the nose and mouth are sealed. A mask portion provided with a vent hole provided with a filter on the front surface is connected so as to be separated by a predetermined partition between the wearing space of the mask portion and the wearing space of the goggles portion. It is a work face mask with a head-mounted part that can be attached to the face while maintaining a sealed state with the goggles and mask part, and the partition part is closed by the increase in pressure inside the mask part due to exhalation. A work face mask characterized by providing an anti-fog ventilation portion provided with a valve body made of a film body that prevents the exhaled air from entering the goggles portion and opens in response to a decrease in the pressure inside the mask portion due to intake air. .. The work face mask according to claim 1, wherein the mask portion is provided with a discharge portion provided with a check valve for discharging exhaled air and closing the air at the time of inspiration. The anti-fog ventilation portion is provided with an edge portion in which the crosspiece is extended to the ventilation hole and the valve body mounting shaft is projected, and the outer edge of the ventilation hole is projected from the crosspiece in the same manner as the valve body mounting shaft. The work face mask according to claim 2, wherein the work face mask is composed of a vent hole portion formed in the process and a valve body made of a film body mounted on a valve body mounting shaft and housed in the edge portion. The anti-fog ventilation part is provided with a ventilation hole portion in which a crosspiece is extended to the ventilation hole and a valve body mounting hole is provided in the crosspiece, and a mounting shaft is provided in the center of a thin concentric stepped film body. The mounting shaft is inserted into the body mounting hole to mount the film body, and the outermost valve surface of the film body abuts on the valve seat surface which is the outer peripheral surface of the ventilation hole to close the ventilation hole. The working face mask according to claim 2, which is configured. The peripheral part of the mask part, which is the face contact point, is formed of a rubber-like folded cushion material, and the upper part of the mask part, which is the partition part, is formed in a triangular shape that covers the nose part in a sealed state. On the face contact side of the shape portion, the triangular top folded portion is cut off, and a mountain-shaped non-breathable mask is attached to the top folded portion including the cut portion by loosening the lower edge portion. The working face mask according to any one of claims 1 to 4.