WO2022168931A1

WO2022168931A1 - Mask facepiece coupling structure

Info

Publication number: WO2022168931A1
Application number: PCT/JP2022/004330
Authority: WO
Inventors: 裕之中神; 賢鈴木; 信也安積
Original assignee: ニプロ株式会社
Priority date: 2021-02-05
Filing date: 2022-02-03
Publication date: 2022-08-11
Also published as: JPWO2022168931A1

Abstract

The objective of the present invention is to provide a novel mask facepiece coupling structure with which it is possible for an airtight coupling between a hard filter support member and a soft face-contacting body that constitute a facepiece of a mask to be achieved with excellent reliability using a structure that is easy to manufacture.　A mask facepiece coupling structure 10 is provided with a hard filter support member 14, and an annular face-contacting body 16 which is softer than the filter support member 14 and which comes into contact with the face of a wearer of the mask, wherein: the filter support member 14 and the face-contacting body 16 are coupled by means of a ring member 32 which is harder than the face-contacting body 16 and which is fixed to the filter support member 14; and an annular sealing portion 28 attached integrally to a periphery of the face-contacting body 16 is sandwiched and compressed between the filter support member 14 and the ring member 32 over the entire perimeter thereof, thereby sealing the coupling part of the face-contacting body 16 and the filter support member 14.

Description

Connection structure for mask facepiece

The present invention relates to a mask face piece connection structure that forms a mask face piece by connecting a hard filter support member to which a filter member is attached and a soft face contact piece that contacts the mask wearer's face.

Conventionally, masks have been used for the purpose of preventing infection through inhalation of viruses, etc. associated with breathing. As a mask, in addition to those in which a filter member that restricts the passage of a target to be captured such as a virus is provided integrally with the facepiece, for example, as in Japanese Patent Application Laid-Open No. 2010-537721 (Patent Document 1), a filter member is provided. Some are attached to the face piece and allow replacement of the filter member.

By the way, it is important that the mask is in close contact with the mask wearer's face when worn so that viruses and the like do not pass between the mask and the face. Therefore, the facepiece of the mask may include a hard filter support member that supports the filter member and a soft face contact member that contacts the mask wearer's face. Then, the face contacting body deforms following the curvature and irregularities of the mask wearer's face, so that the facepiece is fitted to the mask wearer's face without gaps. The face piece of Patent Document 1 is formed by integrally overmolding and joining a hard polymer rigid face piece (filter support member) and a soft silicone sealing face piece (face contact piece) like two-color molding, It has a glued structure.

Japanese Patent Publication No. 2010-537721

However, when the filter supporting member and the face-contacting body are integrally joined by two-color molding or adhesion, the face-contacting body is difficult to come off from the mold when it is removed from the mold after molding. If the filter is forcibly removed from the filter, there is a risk of damage to the face-contacting body or peeling of the connecting portion between the filter support member and the face-contacting body, resulting in a decrease in collection performance. Further, when the filter supporting member and the face-contacting body are joined by adhesion, gaps or holes may be formed in the connecting portion of the filter-supporting member and the face-contacting body due to poor adhesion or poor filling of materials during molding. There is also a risk that the collection performance will be reduced due to a short circuit through the gap or hole.

The problem to be solved by the present invention is to provide a novel mask capable of realizing an airtight connection between a hard filter support member and a soft face contact body, which constitute the facepiece of the mask, in a structure that is easy to manufacture and with excellent reliability. to provide a connecting structure for a face piece.

Hereinafter, preferred embodiments for understanding the present invention will be described. can be recognized and employed as independently as possible, and can also be employed in combination with any of the components described in other aspects as appropriate. Accordingly, the present invention can be implemented in various alternatives without being limited to the embodiments described below.

A first aspect is a mask facepiece connection structure, which includes a hard filter support member to which a filter member is attached, and an annular face contact member that is softer than the filter support member and contacts the mask wearer's face. A ring member fixed to the filter support member and harder than the face contact member connects the filter support member and the face contact member, and surrounds the face contact member. An integrally provided annular seal portion is sandwiched and compressed over the entire circumference between the filter support member and the ring member to seal the connecting portion between the face contact body and the filter support member. There is.

According to the mask face piece connection structure constructed according to this mode, the filter support member and the ring member are fixed, and the seal portion of the face contact is sandwiched between the filter support member and the ring member, thereby A hard filter support member that can stably support the member and a soft face contact member that can be in close contact with the mask wearer's face are connected. If the filter support member and the face contact body are directly fixed by welding or adhesion, the face contact body may be damaged by the mold when the mold is removed after molding, or the quality of the welding or adhesion may deteriorate the connection between the filter support member and the face contact body. In this embodiment, the connecting portion of the filter support member and the face contact member is sealed by sandwiching the seal portion of the face contact member between the filter support member and the ring member. As a result, damage to the face contact by the mold can be reduced, and the connecting portion between the filter support member and the face contact can be stably sealed without being affected by welding quality. In addition, since the ring member and the filter support member are fixed in a state in which the sealing portion of the face contact member is annularly compressed over the entire circumference, the contact between the ring member and the face contact member, the filter support member and the face contact member, and the contact between the filter support member and the face contact member are reduced. It is possible to prevent the formation of gaps through which viruses and the like pass through in the portion of the face (face contact portion) that contacts the face of the mask wearer.

In addition, in the present invention, the area where the face contact body contacts the mask wearer's face is not limited. That is, the face-contacting body is superimposed so as to be pressed against the outer periphery of the mask wearer's mouth and nose and comes into contact with the face. It may be located outside the region or the eye may be located inside the annular region. In short, the facepiece of the mask, including the filter support member and the facepiece, may be either a so-called half-face type or a full-face type. In the case of a full facepiece, the filter support member is transparent to visible light, at least in the portion over the eye.

A second aspect is the mask face piece connection structure according to the first aspect, wherein the ring member and the filter support member have an accommodation space for accommodating an outer peripheral end of the face contact member, and The cross-sectional area of the outer peripheral end of the face contact before being assembled with the ring member and the filter support member is smaller than the cross-sectional area of the accommodation space.

According to the mask facepiece connection structure constructed according to this aspect, when the seal portion of the face contact is sandwiched and compressed by the ring member and the filter support portion, the escape of the seal portion to the accommodation space is allowed. , the filter support member and the ring member can be stably welded and fixed. That is, the ring member has a diameter large enough to contact the outer circumference of the face-contacting body, and is thinner in the radial direction than the face-contacting body. There is also a possibility that the sealing portion cannot be formed without gaps over the entire circumference due to the influence and deviation from the predetermined position. By designing the cross-sectional area of the outer peripheral end of the face-contacting body before assembly to be smaller than the cross-sectional area of the housing space, interference between the face-contacting body and the ring member or the filter support during assembly is reduced, It is possible to stabilize the compression fixation and prevent the formation of gaps through which viruses and the like pass.

A third aspect is a mask facepiece connection structure, comprising a hard filter support member to which a filter member is attached, and an annular face contact member that is softer than the filter support member and contacts the mask wearer's face. A ring member harder than the face contact body and welded and fixed to the filter support member connects the filter support member and the face contact body, and surrounds the face contact body. An annular seal portion provided integrally with the filter support member is sandwiched over the entire circumference between the filter support member and the ring member to seal the connecting portion between the face contact member and the filter support member, The ring member has a guide portion superimposed on the outer peripheral surface or the inner peripheral surface of the filter support member.

According to the mask face piece connection structure constructed according to this aspect, the filter support member and the ring member are welded and fixed, and the sealing portion of the face contact is sandwiched between the filter support member and the ring member, A hard filter support member that can stably support the filter member and a soft face contact member that can be brought into close contact with the mask wearer's face are connected. When the filter support member and the face contact member are directly fixed by welding or adhesion, the quality of the welding or adhesion affects the sealing performance of the connecting portion between the filter support member and the face contact member. The connecting portion of the filter support member and the face contact member is sealed by sandwiching the sealing portion of the face contact member between the ring members. As a result, the filter support member and the ring member can be welded together by fixing and positioning the filter support member and the ring member. is stably sealed without being affected by welding quality.

Further, since the guide portion of the ring member is overlapped with the outer peripheral surface or the inner peripheral surface of the filter support member, the movement of the ring member with respect to the filter support member is restricted in the overlapping direction of the guide portion and the filter support member. . In addition, when the sealing portion of the face contact body is compressed, the elastic force of the sealing portion or the like acts on the ring member, and the ring member moves relative to the filter support member. There is a risk that the reliability of welding will decrease. However, in this aspect, since the movement of the ring member with respect to the filter support member is restricted in the direction in which the guide portion overlaps the filter support member, the filter support member and the ring member are stably welded at a predetermined position. In addition, the sealing portion of the face-contacting body is reliably sandwiched between the filter support member and the ring member, so that a highly reliable mask facepiece without gaps through which viruses or the like can enter can be realized. The guide portion restricts the large movement of the ring member with respect to the filter support member in the welding process, and does not have to be in contact with the filter support member.

A fourth aspect comprises a hard filter support member to which a filter member is attached, and an annular face contact body that is softer than the filter support member and contacts the mask wearer's face, and the face contact body The filter support member and the face-fitting body are connected by a ring member welded and fixed to the filter-supporting member, and an annular seal integrally provided around the face-fitting body. is sandwiched between the filter support member and the ring member along the entire circumference to seal the connecting portion of the face interface and the filter support member, while the ring member and the filter support member are connected to the filter support member; The welded portion is overlapped and welded in the sandwiching direction of the seal portion, and the welded portion is positioned between the filter support member and the seal in the sandwiching direction between the filter support member and the ring member of the seal portion. It is positioned closer to the filter supporting member than the contact surface with the part or closer to the outer peripheral side than the outer peripheral end of the face contact member.

According to the mask facepiece connection structure constructed according to this aspect, the welded portion is provided at a position close to the filter support member side, so the situation in which a gap through which viruses or the like enter is reduced. That is, as the number of welded parts increases, the strength of the filter support part and the ring member increases. Increases the likelihood of creating gaps to penetrate. On the other hand, if the number of welded portions is small, there is a concern that the strength will be insufficient when an external force is applied to the face contact member in the direction away from the filter support member. In particular, when the ring member has a portion located inside the outer peripheral end of the face contact, when an external force is applied to the face contact in a direction away from the filter support member, the outer peripheral end of the face contact on the ring member side of the ring member A strong force in the direction of bending outward is generated in the vicinity of the part. Therefore, when an external force is applied to the face contact member in a direction away from the filter support member, if the welded portion is near the ring member side of the face contact member, the welded portion is likely to peel off, weakening the seal. There will be gaps through which viruses and the like can enter. By providing the welded part at a position close to the filter support member side and keeping the welded part away from the part where the force is directly applied from the face contact body to the filter support member, even if it is a single welded part, the welded part is peeled off. It is possible to have a structure in which it is difficult for

A fifth aspect is a face piece connection structure for a mask, comprising a hard filter support member to which a filter member is attached, and an annular face contact member that is softer than the filter support member and contacts the mask wearer's face. A ring member harder than the face contact body and welded and fixed to the filter support member connects the filter support member and the face contact body, and surrounds the face contact body. An annular seal portion provided integrally with the filter support member is sandwiched over the entire circumference between the filter support member and the ring member to seal the connecting portion between the face contact member and the filter support member, The ring member and the filter support member are superimposed and welded together in the sandwiching direction of the seal portion, and the ring member is attached to the filter support member at an outer periphery from the weld portion. They are overlapped in close proximity or in contact in a direction orthogonal to the sandwiching direction of the seal portion, and a space for welding is formed between the ring member and the filter support member.

According to the mask face piece connection structure constructed according to this aspect, when the filter support portion and the welded portion of the ring member are welded together, the molten resin material is accommodated in the welding cavity. It is possible to prevent the material from leaking to the outside and forming welding burrs. Therefore, special post-processing such as burr removal is not required, and even if a mask wearer or the like grips the outer surface of the face piece connection structure of the mask, the welding burr will not hurt the fingers. do not have.

A sixth aspect is the mask face piece connecting structure according to the fifth aspect, wherein the internal dimension of the welding space is reduced in the sandwiching direction of the seal portion as the distance from the welding portion increases. There is.

According to the mask facepiece connection structure constructed according to this aspect, since the internal dimensions of the welding space decrease with increasing distance from the welding part, the molten resin material that has flowed into the welding space is affected. Flow resistance increases with increasing distance from the weld. Therefore, the molten resin material that has flowed into the welding cavity from the side closer to the welding part is less likely to leak out from the welding cavity at a position farther from the welding part, and welding burrs that protrude from the outer surface of the face piece are less likely to be formed. .

A seventh aspect is the mask face piece connection structure according to the fifth or sixth aspect, wherein the welding cavity is open to the outside between the filter support member and the ring member. be.

According to the mask facepiece connection structure constructed according to this aspect, even if the molten resin material flows out, burrs are less likely to be formed on the outer peripheral surface and corners of the mask, and the burrs cause discomfort to the user. It is possible to reduce the situation that makes you think.

An eighth aspect is the mask face piece connection structure according to any one of the fifth to seventh aspects, wherein the ring member is inserted into the filter support member, and the outer peripheral surface of the ring member is is superposed on the inner peripheral surface of the filter support member in the radial direction, and the insertion tip of the ring member with respect to the filter support member is the welded portion, while the outer peripheral surface of the ring member is attached to the insertion tip. The inner peripheral surface of the filter support member has a cylindrical surface extending non-inclined in the insertion direction of the ring member, and the tapered surface of the ring member and the The welding space is formed between the filter support member and the cylindrical surface.

According to the mask facepiece connection structure constructed according to this mode, the outer peripheral surface of the ring member has a tapered surface, so that the ring member can be easily inserted into the filter support member. In addition, by utilizing the relative inclination between the cylindrical surface of the filter support member and the tapered surface of the ring member, the space for welding, which becomes narrower with increasing distance from the welding portion, is formed between the cylindrical surface of the filter support member and the ring member. It is formed between the tapered surface of the member.

A ninth aspect is a mask facepiece connection structure, comprising a hard filter support member to which a filter member is attached, and an annular face contact member that is softer than the filter support member and contacts the mask wearer's face. A ring member harder than the face contact body and welded and fixed to the filter support member connects the filter support member and the face contact body, and surrounds the face contact body. An annular seal portion provided integrally with the filter support member is sandwiched over the entire circumference between the filter support member and the ring member to seal the connecting portion between the face contact member and the filter support member, At the outer periphery of the seal portion of the face contact body, a retaining protrusion projecting in a direction in which the seal portion is sandwiched between the filter support member and the ring member is provided. At least one of the retaining projections and the retaining projection restrict movement of the seal portion toward the inner periphery.

According to the mask face piece connection structure constructed according to this aspect, the movement of the seal portion toward the inner periphery is restricted by the retaining projection provided on the outer periphery of the seal portion, so that the seal portion supports the filter. It is possible to prevent the member and the ring member from deviating from the clamping position toward the inner periphery. As a result, the face contact member can be easily held at a predetermined position during, for example, a welding process (compression process), and a reliable seal can be easily achieved. Further, even if the seal portion is pulled toward the inner peripheral side due to, for example, an external force acting on the face contact member, the seal at the connecting portion between the filter support member and the face contact member does not shift in position and is stable. and maintained.

The retaining projection may be sandwiched and compressed between the filter support member and the ring member, or may not be compressed by the filter support member and the ring member. If the retaining projection is arranged in a compressed state, another seal portion can be formed on the outer peripheral side of the seal portion, and a double seal structure can be achieved. If the removal-preventing protrusion is arranged in an uncompressed state, resistance due to compression of the removal-preventing protrusion can be reduced when connecting the filter support member and the ring member. Difficulty in assembling members and the like are reduced.

A tenth aspect is the mask facepiece connection structure according to the ninth aspect, wherein the seal portion is sandwiched between the filter support member and the ring member with a force greater than that of the retaining protrusion. There is.

According to the mask facepiece connection structure constructed according to this aspect, the seal portion is sandwiched with a greater force than the removal-preventing protrusion, so the removal-prevention protrusion applies stress to the filter support member and the ring member, To reduce adverse effects such as inadequate compression of the sealing portion, and to exhibit effective sealing performance at the sealing portion. It should be noted that the removal-preventing protrusion does not have to be in contact with the filter support member and the ring member in the sandwiching direction of the seal portion. Preferably, the retaining projection is arranged with a gap from the filter support member and the ring member without being sandwiched between the filter support member and the ring member before being assembled to the filter support member and the ring member. It is sized so that As a result, the provision of the removal-preventing projection restricts the movement of the sealing portion toward the inner circumference, while eliminating the influence of the removal-preventing projection being sandwiched between the filter support member and the ring member on the sealing performance of the seal portion. be able to.

An eleventh aspect is the mask face piece connection structure according to the ninth or tenth aspect, wherein a pair of the retaining projections projecting to both sides in the sandwiching direction of the seal portion are provided, The retaining structure is constituted by the locking of the retaining projection and the filter support member and the locking of the retaining projection of the other retaining projection and the ring member.

According to the mask facepiece connection structure constructed according to this aspect, since the retaining structure is formed by at least one of the retaining protrusions according to the direction of input to the face-contacting body, force acts on the face-contacting body. Regardless of the direction, movement of the seal portion toward the inner periphery is restricted, and stable sealing performance can be obtained at the seal portion.

A twelfth aspect is the mask face piece connection structure according to any one of the first to eleventh aspects, wherein a gap is formed between the inner peripheral surface of the ring member and the face contact member. There is. According to the mask face piece connection structure constructed according to this aspect, the face contact member can be freely deformed by the amount of the gap. The transmitted force can be reduced.

According to the present invention, the airtight connection between the hard filter supporting member and the soft face-contacting member that constitute the face piece of the mask can be realized with excellent reliability in an easy-to-manufacture structure.

1 is a cross-sectional view showing a part of a face piece connection structure as a first embodiment of the present invention; FIG. FIG. 3 is a cross-sectional view of a ring member constituting the face piece connecting structure shown in FIG. 1, and corresponds to the cross section II-II in FIG. III-III sectional view of FIG. Sectional drawing which shows the modification of 1st Embodiment Sectional view showing a part of the face piece connection structure as a second embodiment of the present invention. Sectional view showing a part of the face piece connection structure as a third embodiment of the present invention A sectional view showing a part of a face piece connection structure as a fourth embodiment of the present invention. FIG. 2 is a perspective view showing a mask provided with the face piece connection structure shown in FIG. 1 in a wearing state; FIG. 9 is a perspective view showing the mask body constituting the mask of FIG. 8 from another angle. FIG. 11 is a cross-sectional view of the mask shown in FIG. 8 and corresponds to the XX cross-section of FIG. 11; XI-XI sectional view of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows part of a mask facepiece connection structure 10 (hereinafter referred to as a facepiece connection structure 10) as a first embodiment of the present invention. The facepiece connection structure 10 constitutes a part of the facepiece 12 . The facepiece 12 has a half face shape or a full face shape, and has a structure in which a filter support member 14 and a face contact body 16 are connected. As the face piece 12, for example, a structure such as the facepiece disclosed in Japanese Patent Application Laid-Open No. 2010-537721 can be adopted. Although two filter cartridges each having a filter member are attached to the face piece of Japanese Patent Application Publication No. 2010-537721, only one filter member may be attached to the center of the face piece 12, for example. , three or more may be attached to the facepiece 12 . Further, the present invention is characterized by a connection structure between the filter support member 14 and the face contact member 16 that constitute the facepiece 12. The shape, size, material, etc. are not limited. In the following description, as a general rule, the front refers to the left side in FIG. 1, which is the front of the mask wearer, and the rear refers to the right side in FIG. , respectively say.

The filter support member 14 is made of a thermoplastic resin material. The filter support member 14 is a hard member that is less deformable than the face contact member 16, and has shape stability capable of stably supporting the filter member. The filter support member 14 is opened toward the rear and has a smaller diameter toward the front, and a filter member (not shown) having a filter medium is arranged at the front. Therefore, the filter support member 14 is shaped to cover the front of the mask wearer's face, allowing ventilation through the filter member.

At the rear end of the filter support member 14, a ring accommodating portion 18 having a large diameter is provided in a stepped manner. The ring accommodating portion 18 includes a flange-shaped bottom wall portion 20 that widens toward the outer periphery, and a peripheral wall portion 22 that protrudes rearward from the outer peripheral end portion of the bottom wall portion 20 . A clamping projection 24 projecting rearward is integrally formed at the inner peripheral end portion of the bottom wall portion 20 . The holding protrusion 24 is provided at a position away from the peripheral wall 22 toward the inner peripheral side, and has a smaller protrusion height from the bottom wall 20 than the peripheral wall 22 . The inner peripheral surface of the peripheral wall portion 22 is a cylindrical surface 26 extending with a substantially constant diameter in the front-rear direction, which is the direction in which the peripheral wall portion 22 protrudes. The outer peripheral surface of the peripheral wall portion 22 of the present embodiment is inclined rearward toward the outer periphery, the radial thickness dimension increases toward the rear, and the outer peripheral surface is chamfered at the rear end portion. It is slanted toward the inner circumference toward the rear, and the rear end portion is made thin.

The face contact body 16 is made of rubber, resin elastomer, or the like, and is softer than the filter support member 14 and flexibly deformable, and an elastic material is preferably used. The face contact member 16 has a ring shape that is brought into close contact around the mouth of the mask wearer's face when the mask is worn. When the facepiece 12 is half-face-shaped, the facepiece 16 can be brought into close contact with the face so that the nose and mouth are positioned on the inner circumference of the facepiece 16 and the eyes are positioned on the outer circumference of the facepiece 16. shape. When the face piece 12 is of a full face shape, the face piece 16 has a shape that allows close contact with the face so that the nose, mouth, and eyes are all located on the inner periphery of the face piece 16 . The face contact member 16 has flexibility to follow the curvature and unevenness of the mask wearer's face when the mask is worn, and has elasticity to maintain close contact with the face of the mask wearer. there is The cross-sectional shape of the face contact body 16 is not limited as long as it is annular as described above. good.

A seal portion 28 is integrally provided at the front end portion of the face contact member 16 . The seal portion 28 of the present embodiment is formed in a flange shape protruding outward from the front end portion of the face contact member 16, and is provided continuously over the entire circumference. The seal portion 28 may be continuously provided with a seal lip projecting in at least one direction in the front-rear direction over the entire circumference.

A pair of retaining

projections

30a and 30b are provided on the outer periphery of the seal portion 28. The retaining

protrusions

30a and 30b protrude from the seal portion 28 toward one of the front and rear sides. The retaining

protrusions

30a and 30b may be partially provided in the circumferential direction, or may be provided continuously over the entire circumference. Note that the front and rear retaining

protrusions

30a and 30b may have the same shape, or may have different shapes and sizes in consideration of the expected difference in input.

The face contact body 16 is superimposed on the filter support member 14 from behind. A seal portion 28 of the face contact member 16 is located behind the holding protrusion 24 of the filter support member 14 . The retaining protrusion 30a on the front side of the face contact member 16 is located on the outer periphery of the holding protrusion 24 of the filter support member 14, and is arranged at a position overlapping the holding protrusion 24 in projection in the radial direction.

The filter support member 14 and the face contact member 16 are fixedly connected to each other by a ring member 32 shown in FIGS. The ring member 32 is made of a thermoplastic resin material and has an annular shape that continues in the circumferential direction. The ring member 32 is a harder member than the face contact member 16, and is made of the same material as the filter support member 14 in this embodiment. The ring member 32 includes an annular plate-shaped base portion 34, a support cylinder portion 36 as an annular projecting portion projecting forward from the outer peripheral end portion of the base portion 34, and a support cylinder portion 36 projecting forward from the inner peripheral end portion of the base portion 34. It is integrally provided with a clamping cylinder portion 38 projecting toward.

The base portion 34 has a cylindrical shape with an outer peripheral surface that extends in the front-rear direction with a substantially constant outer diameter. The base portion 34 has a guide portion 39 whose outer peripheral portion overlaps the inner peripheral surface (cylindrical surface 26 ) of the peripheral wall portion 22 of the filter support member 14 . The inner peripheral surface of the base portion 34 has a cylindrical rear portion extending in the front-rear direction with a substantially constant inner diameter, and a front portion of the inner peripheral surface that is widened toward the front and inclined toward the outer periphery.

The support cylinder portion 36 has an inner peripheral surface with a substantially constant inner diameter dimension in the front-rear direction, and an outer peripheral surface with a tapered surface 40 that inclines toward the inner periphery toward the front, and projects from the base portion 34 . It is gradually made thinner in the radial direction toward the front, which is the tip side. The support cylinder portion 36 has a longitudinal dimension smaller than that of the peripheral wall portion 22 of the filter support member 14 . The distance from the rear end of the base portion 34 to the tip of the support tube portion 36, which is the maximum length dimension of the ring member 32 in the front-rear direction, is larger than the length dimension of the peripheral wall portion 22 in the front-rear direction.

A welding projection 42 is provided at the front end of the support cylinder portion 36 . The welding projections 42 extend in the circumferential direction with a triangular cross-section that narrows toward the front, and are provided at four locations in the circumferential direction in this embodiment.

Although the welding projections 42 may be provided continuously over the entire length in the circumferential direction, it is desirable to provide at least a portion in the circumferential direction where there are no welding projections 42 . As a result, when the filter support member 14 and the ring member 32 are welded together, formation of welding burrs due to leakage of the melted resin material to the outside is suppressed.

The clamping cylinder part 38 has a length in the front-rear direction shorter than that of the support cylinder part 36 , and the front end is located behind the front end of the support cylinder part 36 . In short, the clamping cylinder portion 38 has a projection dimension forward from the base portion 34 smaller than a projection dimension forward from the base portion 34 of the support cylinder portion 36 . In this embodiment, as enlarged in FIGS. 2 and 3, the cross-sectional shape of the clamping cylinder portion 38 changes in the circumferential direction, but the cross-sectional shape of the clamping cylinder portion 38 is substantially constant over the entire circumference. may The inner peripheral surface of the clamping cylinder portion 38 is inclined toward the outer periphery toward the front and is continuous with the inner peripheral surface of the front portion of the base portion 34 . The inner diameter of the clamping cylinder portion 38 is larger than the inner diameter of the clamping protrusion 24 of the filter support member 14, so that the inner diameter of the face contact member 16 superimposed on the inner periphery of the clamping cylinder 38 is large. Secured.

The ring member 32 is inserted into the ring accommodating portion 18 of the filter support member 14 with the face contact member 16 superimposed on the rear side of the filter support member 14 . The ring member 32 has a tapered surface 40 at the insertion tip portion, which facilitates insertion into the ring accommodating portion 18 . The ring member 32 inserted into the ring accommodating portion 18 is pressed against the seal portion 28 of the face contact member 16 from behind by the clamping cylinder portion 38 . As a result, the seal portion 28 is sandwiched and supported in the front-rear direction between the sandwiching protrusion 24 of the filter support member 14 and the sandwiching cylinder portion 38 of the ring member 32 .

The filter support member 14 and the ring member 32 are integrated by welding and fixing the end portion of the support tube portion 36 inserted into the ring housing portion 18 and the bottom wall portion 20 of the ring housing portion 18 superimposed on each other in the front-rear direction. are linked together. Specifically, for example, the filter support member 14 and the ring member 32 are fixed by ultrasonic welding. That is, for example, while the front surface of the bottom wall portion 20 of the filter support member 14 is supported by a jig (not shown), a horn is pressed against the rear surface of the ring member 32 to apply ultrasonic waves to the bottom wall of the filter support member 14 . The contact portion between the portion 20 and the welding projection 42 of the ring member 32 melts. By stopping the ultrasonic wave, the molten resin material is cooled and solidified, and the ring member 32 and the filter support member 14 are integrally welded and fixed. As described above, in the present embodiment, the welding portion 44 is formed by the overlapping portion of the support cylinder portion 36 of the ring member 32 having the welding projection 42 and the bottom wall portion 20 of the filter support member 14 .

By fixing the filter support member 14 and the ring member 32 to each other in this way, the sealing portion 28 of the face contacting body 16 is separated from the holding projection portion 24 of the filter support member 14 and the holding cylinder portion 38 of the ring member 32. It is held in a state of being sandwiched between them over the entire circumference. As a result, the filter support member 14 and the face contact member 16 are connected without being separated from each other, and the overlapped surfaces of the filter support member 14 and the seal portion 28 of the face contact member 16 are airtight over the entire circumference. is sealed to

In the face piece connecting structure 10, the sealing structure is provided separately from the fixing structure by welding, and the quality of welding (presence or absence of gaps or holes in the welded portion, etc.) does not affect the airtightness of the connecting portion. Therefore, according to the face piece connection structure 10, when the filter support member 14 and the face contact piece 16, which are separately and independently prepared, are connected to form the face piece 12, airtightness required for the connection portion can be achieved. It can be realized stably. Moreover, the welding of the filter support member 14 and the ring member 32 may be performed by fixing the filter support member 14 and the ring member 32 with the necessary strength and positioning them relative to each other, and airtightness over the entire periphery is not required. , the welding quality control becomes easier.

The ring member 32 inserted into the ring accommodating portion 18 of the filter support member 14 is arranged such that the guide portion 39 is positioned against the inner peripheral surface (cylindrical surface 26 ) of the peripheral wall portion 22 of the filter support member 14 from the tip of the clamping cylinder portion 38 . are also superimposed in close proximity in the radial direction. As a result, the amount of movement of the ring member 32 toward the outer peripheral side with respect to the filter support member 14 is limited by the engagement between the guide portion 39 and the peripheral wall portion 22 . As a result, for example, the ring member 32 is welded and fixed to the filter support member 14 at an appropriate position, so that the holding protrusion 24 of the filter support member 14 and the holding cylindrical portion 38 of the ring member 32 are sealed. are arranged opposite each other at a position where they can be sandwiched. In the present embodiment, there is a gap (a constriction region 47 described later) between the outer peripheral surface of the guide portion 39 and the cylindrical surface 26 of the peripheral wall portion 22 , and the guide portion 39 is separated from the peripheral wall portion 22 . However, the guide portion 39 may be fitted to the peripheral wall portion 22 and overlapped with the cylindrical surface 26 in a contact state.

In a state in which the cylindrical support portion 36 of the ring member 32 is inserted into the inner circumference of the peripheral wall portion 22 of the filter support member 14, the tapered surface 40 provided on the outer peripheral surface of the cylindrical support portion 36 and the inner peripheral surface of the peripheral wall portion 22 Certain cylindrical surfaces 26 are radially superimposed. A welding cavity 46 is formed between the overlapping surfaces of the cylindrical surface 26 and the tapered surface 40 . The welding space 46 is located on the outer peripheral side of the welding portion 44 which is the tip portion of the support cylinder portion 36 provided with the welding projection 42, and the resin material melted when the welding portion 44 is welded flows into the space 46. It is designed to As a result, it is possible to prevent the molten resin material from being contained in the welding cavity 46 during welding and protruding to the outside to form welding burrs. Since the inflow mode and amount of the molten resin material into the welding space 46 are not uniform, the illustration of the resin material accommodated in the welding space 46 is omitted.

The welding cavity 46 extends in the front-rear direction with a substantially constant inner diameter dimension, and the tapered surface 40 has a smaller diameter toward the front. The width dimension in the radial direction gradually decreases toward the rear. As a result, the flow resistance of the molten resin material that has flowed into the welding space 46 gradually increases toward the rear, which is the opening side of the welding space 46 . As a result, even if the molten resin material flows into the rear portion of the welding space 46, the large flow resistance makes it difficult for the molten resin material to flow out of the welding space 46, and welding burrs are less likely to form.

In particular, behind the tapered surface 40 of the ring member 32, there is provided a guide portion 39 close to the inner peripheral surface (cylindrical surface 26) of the peripheral wall portion 22 of the filter support member 14. A narrowed region 47 having a width narrower than that of the space 46 for welding extends over a certain length in the front-rear direction between the surfaces facing the outer peripheral surface of the guide portion 39 . Therefore, even if the molten resin material enters the constricted area 47, the molten resin material is hard to pass through the constricted area 47 due to the large flow resistance acting on the molten resin material in the narrowed constricted area 47. Therefore, the formation of welding burrs is prevented.

The support cylinder portion 36 of the ring member 32 is inserted into the ring housing portion 18 of the filter support member 14, and the abutment portion between the projecting tip portion of the support cylinder portion 36 and the bottom wall portion 20 of the ring housing portion 18 is the welding portion. 44. The protruding tip of the support cylinder portion 36 is located forward of the clamping cylinder portion 38 that sandwiches the seal portion 28 and is closer to the filter support member 14 . 28 is located forward. As a result, for example, when force is input from the face contact member 16 to the clamping cylinder portion 38 in contact with the seal portion 28 , the force transmission path from the input point to the welding portion 44 is lengthened, It is possible to suppress the transmission force. Therefore, peeling of the welded portion 44 due to the action of force is suppressed, and deterioration of sealing performance is prevented. The welded portion 44 is positioned closer to the filter support member 14 than the seal portion 28 only when it is positioned closer to the filter support member 14 than the contact surface (front surface) of the seal portion 28 with the filter support member 14 . Instead, for example, if it is positioned closer to the filter support member 14 than the contact surface (rear surface) of the seal portion 28 with the ring member 32, the effect of suppressing the peeling of the welded portion 44 can be exhibited. When the welded portion 44 is arranged closer to the filter support member 14 than the seal portion 28, the welded portion 44 is arranged closer to the filter support member 14 than the center of the seal portion 28 in the sandwiching direction (front-rear direction). is desirable. In addition, the welding part 44 may be positioned on the outer peripheral side of the outer peripheral part of the face contacting body 16, compared to the case where the welding part 44 is positioned on the ring member 32 side (for example, rearward) from the face contacting body 16. Therefore, it is possible to reduce the situation in which the welded portion 44 is peeled off.

The outer peripheral end of the face contact member 16 including the pair of retaining

protrusions

30a and 30b is housed in the housing space 48 formed between the facing surfaces of the bottom wall portion 20 of the filter support member 14 and the base portion 34 of the ring member 32. It is Before the sealing portion 28 is sandwiched between the filter support member 14 and the ring member 32 , the outer peripheral edge of the face contact member 16 including the retaining

projections

30 a and 30 b is aligned with the center of the ring member 32 . The cross-sectional area of the vertical cross section (the cross section shown in FIG. 1) including the axis is made smaller than the cross-sectional area of the housing space 48 in the same cross-sectional area. As a result, the seal portion 28 compressed between the filter support member 14 and the ring member 32 is allowed to enter the accommodation space 48, and the welded portion 44 between the filter support member 14 and the ring member 32 abuts at an appropriate position. They are joined together and fixed by welding.

Preferably, in the longitudinal section, the width dimension in the direction perpendicular to the axis (vertical direction in FIG. 1) of the outer peripheral edge of the face contact member 16 is smaller than the inner width dimension of the housing space 48 in the same direction. Thus, the resistance when inserting the outer peripheral end of the face contact member 16 into the accommodation space 48 is suppressed. Preferably, in the vertical cross section, the length of the outer peripheral end of the face contacting body 16 alone in the axial direction (left and right direction in FIG. 1, which is the direction in which the seal portion 28 is sandwiched) It is made smaller than the inner length dimension in the same direction, so that the seal portion 28 can be sandwiched with a greater force than the outer peripheral end of the face contact member 16 to obtain the desired sealing performance.

The front retaining projection 30a provided on the outer periphery of the seal portion 28 is inserted between the facing surfaces of the clamping projection 24 of the filter support member 14 and the support cylinder portion 36 of the ring member 32, and the retaining projection 30a is inserted. The amount of movement to the inner circumference side of is restricted. As a result, the sealing portion 28 is less likely to come off from between the facing surfaces of the clamping protrusion 24 and the clamping cylinder portion 38 toward the inner peripheral side.

Further, the rear retaining projection 30b provided on the outer periphery of the seal portion 28 is inserted between the facing surfaces of the support cylinder portion 36 and the clamping cylinder portion 38 of the ring member 32, and the inner circumference of the retaining projection 30b is inserted. The amount of movement to the side is limited by engagement with the clamping cylinder portion 38 . As a result, the amount of movement of the sealing portion 28 integrally formed with the removal-preventing projection 30b toward the inner circumference is limited by the removal-prevention structure 49b configured by engaging the removal-preventing projection 30b and the clamping cylinder portion 38, The sealing portion 28 is prevented from coming off from between the facing surfaces of the clamping protrusion 24 and the clamping cylinder portion 38 toward the inner peripheral side.

In this way, the movement of the seal portion 28 toward the inner periphery is restricted by the retaining

structures

49a and 49b formed by locking the retaining

protrusions

30a and 30b with the filter support member 14 and the ring member 32, and the seal portion 28 is prevented from moving toward the inner peripheral side. is pinched between the pinching protrusion 24 and the pinching cylindrical portion 38, thereby exhibiting a stable sealing performance. Since the pair of retaining

protrusions

30a and 30b protruding to both front and rear sides form the retaining

structures

49a and 49b, for example, the tilting direction of the seal portion 28 can be prevented when the seal portion 28 is pulled out to the inner peripheral side due to the tilting of the seal portion 28. Regardless of the (input direction to the seal portion 28), the retaining structure 49 is configured to prevent the seal portion 28 from coming off toward the inner peripheral side. In addition, the pair of retaining

projections

30a and 30b projecting to both the front and rear sides also function in the welding process. That is, the outer peripheral portion of the face contact member 16 having the seal portion 28 and the retaining

protrusions

30a and 30b is designed to be smaller than the entire face contact member 16. As shown in FIG. As a result, it is possible to increase the size of the internal space of the face contact member 16 while preventing the outer shape of the face contact member 16 as a whole from becoming large. The position of the outer peripheral portion of the face contact body 16 tends to become unstable. Therefore, by providing a pair of retaining

protrusions

30a and 30b projecting to both the front and rear sides, it becomes easy to keep the face contact member 16 at a predetermined position, and it is easy to achieve a reliable seal at the outer peripheral portion of the face contact member 16. Become.

As shown in FIG. 1, it is desirable that the radial thickness dimension of the retainer protrusion 30a is smaller than the distance between the facing surfaces of the clamping protrusion 24 and the support cylinder 36. As shown in FIG. In addition, it is desirable that the thickness dimension of the retainer protrusion 30b in the radial direction is smaller than the distance between the facing surfaces of the support cylinder part 36 and the sandwiching cylinder part 38 . As a result, the resistance when inserting the ring member 32 into the ring accommodating portion 18 of the filter support member 14 is reduced, and the situation in which the seal portion 28 and the welded portion 44 are displaced from the predetermined positions during welding can be reduced. can.

The length in the front-rear direction from the front end of the retaining projection 30a to the rear end of the retaining projection 30b is smaller than the distance between the facing surfaces of the bottom wall portion 20 of the filter support member 14 and the base portion 34 of the ring member 32. is desirable. Accordingly, the retaining

protrusions

30a and 30b are not sandwiched between the filter support member 14 and the ring member 32 in the longitudinal direction, and the compression of the seal portion 28 is not hindered by the compression of the retaining

protrusions

30a and 30b. Therefore, it is possible to stably obtain the sealing performance by sandwiching the seal portion 28 . In this embodiment, since the retaining

protrusions

30a and 30b are not sandwiched between the filter support member 14 and the ring member 32 in the front-rear direction, the seal portion 28 supports the filter with a larger force than the retaining

protrusions

30a and 30b. It is sandwiched between member 14 and ring member 32 .

In the present embodiment, the retaining

protrusions

30a and 30b are provided so that the bottom wall portion 20 of the filter support member 14 and the base portion 34 of the ring member 32 face each other even when the filter support member 14 and the ring member 32 are assembled. A gap is formed with respect to the accommodation space 48 by making the cross-sectional area smaller than the accommodation space 48 of the retaining

projections

30a and 30b formed between the surfaces. However, the elastic body (face contact body 16) displaced by the compression of the seal portion 28 by the filter support member 14 and the ring member 32 may contact the inner surface of each wall of the accommodation space 48, and the accommodation space 48 may be an elastic body. , etc., may be filled. That is, the seal portion 28 compressed between the filter support member 14 and the ring member 32 is elastically deformed so as to escape to the outer peripheral side, and enters into the housing space 48 of the retaining

protrusions

30a and 30b, thereby removing the retaining protrusions. The accommodation space 48 of 30a, 30b can be narrowed or filled with an elastic body.

The inner peripheral portion of the ring member 32 is inserted into the inner periphery of the rear retainer protrusion 30b and is positioned away from the inner peripheral portion of the face contact member 16 toward the outer peripheral side. A gap 45 is formed between the surface and the outer peripheral surface of the face contact member 16 . Since the space 45 is provided, for example, even if the face contact body 16 is deformed (displaced) to the outer periphery by the action of an external force, the face contact body 16 is unlikely to come into contact with the inner peripheral surface of the ring member 32, and the ring member 32 is formed. The transmission of force to the sealing portion 28 and the welding portion 44 is suppressed.

FIG. 4 shows a modification of the mask face piece connection structure 10 of the first embodiment of the present invention. In FIG. 4, the sealing portion 28 of the face contact member 16 is slightly stretched inward so that the compression of the sealing portion 28 and the welding process between the filter support member 14 and the ring member 32 can be stably performed. In this state, it is clamped by the clamping protrusion 24 and the clamping tube portion 38 . At this time, since at least a portion of the inner peripheral surfaces of the retaining

projections

30a and 30b (for example, at least a portion in the circumferential direction or in the cross section of FIG. 4) is in contact with the holding projection 24 and the holding tube portion 38, The retaining

protrusions

30a and 30b contribute to the positioning of the face contact member 16. As shown in FIG. Since the retaining

protrusions

30a and 30b restrict the movement of the seal portion 28 toward the inner peripheral side even when the seal portion 28 is compressed, the seal portion 28 is easily compressed. In addition, the clamping cylinder portion 38 is formed smaller than the recess on the inner peripheral side of the retention projection 30b, so that the clamping cylinder portion 38 can be easily inserted into the recess. A larger gap 45 is formed between the body 16 and the force transmission to the seal portion 28 when the face contacting body 16 is pulled by an external force is reduced by the amount of the gap 45 .

FIG. 5 shows part of a mask face piece connecting structure 50 as a second embodiment of the present invention. The face piece connection structure 50 has a structure in which a filter support member 52 and a face contact member 16 are connected by a ring member 54 . In the following description, members and parts that are substantially the same as those of the above-described embodiment may be denoted by the same reference numerals as in the first embodiment, and description thereof may be omitted.

The filter support member 52 has a peripheral wall portion 56 at its rear end. The peripheral wall portion 56 protrudes rearward from the outer peripheral end of the bottom wall portion 20 that protrudes outward from the rear end portion of the filter support member 52 . The peripheral wall portion 56 has an inner peripheral surface that is the cylindrical surface 26 and has a substantially constant inner diameter dimension in the front-rear direction, and an outer peripheral surface that is an inclined surface 57 that decreases in diameter toward the rear and has an outer diameter. The dimensions gradually decrease towards the rear. A welding projection 42 is integrally provided on the rear end surface of the peripheral wall portion 56 so as to protrude therefrom. In FIGS. 5 to 7, the welding projection 42 before welding is virtually illustrated by a two-dot chain line in order to facilitate understanding of the welding location.

The seal portion 28 of the face contact member 16 is superimposed on the holding protrusion 24 of the filter support member 52, and the front retaining protrusion 30a is inserted between the facing surfaces of the holding protrusion 24 of the filter support member 52 and the peripheral wall portion 56. It is

The ring member 54 has a structure in which a supporting tubular portion 58 and a clamping tubular portion 38 are connected by the base portion 34 at the rear end portion. The support tube portion 58 has a substantially constant thickness and protrudes forward from the outer peripheral end portion of the base portion 34, and has a tubular shape with an inner peripheral surface that extends in the front-rear direction without being inclined. The front end of the support tube portion 58 of this embodiment is not provided with the welding protrusion 42 unlike the support tube portion 58 of the first embodiment.

The ring member 54 is attached to the rear end portion of the filter support member 52 . The cylindrical support portion 58 of the ring member 54 is fitted over the peripheral wall portion 56 of the filter support member 52 , and the front end portion of the cylindrical support portion 58 overlaps the outer peripheral surface of the peripheral wall portion 56 so that the ring member 54 and Filter support members 52 are radially positioned relative to each other. Thus, the front end portion of the support cylinder portion 58 serves as the guide portion 39 of this embodiment.

The rear end surface of the peripheral wall portion 56 of the filter support member 52 overlaps the welding projection 42 protruding forward of the base portion 34 of the ring member 54, and the peripheral wall portion 56 and the base portion 34 are welded and fixed to support the filter. Member 52 and ring member 54 are positioned relative to each other. By fixing the filter support member 52 and the ring member 54 by welding in this manner, the seal portion 28 of the face contact member 16 is positioned between the holding protrusion 24 of the filter support member 52 and the holding cylindrical portion 38 of the ring member 54 . The filter support member 52 and the face contact member 16 are airtightly connected.

A welding space 46 is formed between the overlapping surfaces of the peripheral wall portion 56 of the filter support member 52 and the support cylinder portion 58 of the ring member 54 . The welding space 46 has a radial width that decreases from the rear end near the welding portion 44 toward the front due to the inclined surface 57 . As a result, the molten resin material is less likely to leak from the front opening of the welding space 46, and welding burrs are less likely to be formed.

A mask face piece connection structure 60 as a third embodiment shown in FIG. and a second guide portion 66 that is provided. In addition, there is no gap between the inner peripheral surface of the first guide portion 64 and the outer peripheral surface of the filter support member 52, and the outer peripheral surface of the second guide portion 66 is formed with an inclined surface so that the molten resin can flow to the outer peripheral surface. It is easy to move to the inner circumference side instead of the side. As shown in FIG. 6, the support cylinder portion 58 of the ring member 62 may have a shorter projection length from the base portion 34 than the clamping cylinder portion 38 , and the front surface of the support cylinder portion 58 is the front surface of the clamping cylinder portion 38 . It may be located behind.

FIG. 7 shows part of a mask face piece connecting structure 70 as a fourth embodiment of the present invention. The face piece connection structure 70 has a structure in which the filter support member 52 and the face contact member 16 are connected by a ring member 72 .

The ring member 72 has a structure similar to that of the ring member 32 of the first embodiment in which the support cylinder portion 36 is omitted. The ring member 72 integrally includes an annular plate-shaped base portion 34 and a clamping cylinder portion 38 projecting forward from an inner peripheral end portion of the base portion 34 .

The ring member 72 is welded and fixed to the peripheral wall portion 22 of the filter support member 52 while the outer peripheral end portion of the base portion 34 is overlapped. As a result, the seal portion 28 of the face contact member 16 is held between the holding protrusion 24 of the filter support member 52 and the ring member 72, and the filter support member 52 and the face contact member 16 are connected by the ring member 72. .

As shown in this embodiment, the guide portion overlapping the inner peripheral surface or the outer peripheral surface of the filter support member 52 is not essential. If the guide portion is not provided, for example, the filter support member 52 and the ring member 72 are welded while being positioned in the radial direction by a jig (not shown) so that the filter support member 52 and the ring member 72 are properly aligned. Can be welded and fixed in place.

By the way, FIGS. 8 to 11 show an example of a half-face mask 80 provided with the face piece connection structure 10 according to the first embodiment. The mask 80 includes a mask body 82 that covers the wearer's mouth and nose, and a band 84 that positions and holds the mask body 82 against the wearer's A face. The mask main body 82 includes a facepiece 12 to be worn on the face of the wearer A, and a filter unit 86 held by the facepiece 12 .

As shown in FIGS. 10 and 11, the filter unit 86 has a filter member 88 that filters out foreign substances such as viruses and dust. The filter member 88 has a pleated filter sheet 90 which is folded back many times to form a plurality of crests and valleys. The filter sheet 90 is, for example, a porous filter membrane and is made of nonwoven fabric or the like. Moreover, the pleated shape of the filter sheet 90 is held by beads formed of a thermoplastic adhesive or the like. Since the filter sheet 90 has a pleated shape, it is possible to secure a large effective surface area of the filter sheet 90 while avoiding an increase in the size of the mask body 82, thereby achieving excellent foreign matter removal performance and reduction of suffocation. , can be realized with a relatively small mask body 82 .

The filter member 88 is attached to the support 92 . The support 92 has a frame portion 94 having, for example, a rectangular tubular shape, and the filter member 88 is accommodated in the inner circumference of the frame portion 94 . The support 92 is an elastic body made of rubber, resin elastomer, or the like. In the support 92 , the rear end portion of the frame portion 94 (the end portion on the side of the wearer A when worn) is connected to the plate-like portion 96 . The plate-shaped portion 96 has a flange shape protruding from the rear end portion of the frame portion 94 toward the outer periphery, and is integrally formed with the frame portion 94 in this embodiment. The plate-like portion 96 has an outer peripheral shape that substantially corresponds to the inner peripheral shape of the filter support member 14 (described later) of the face piece 12 , and can be accommodated inside the filter support member 14 . The support 92 is desirably connected to the filter member 88 by means of heat welding or the like, whereby the filter member 88 and the support 92 form a filter unit 86 that can be handled integrally.

The filter support member 14 of the facepiece 12 shown in FIGS. 8 to 11 includes a cylindrical first member 98 connected to the face contact member 16 and a second member 100 covering the opening on the front side of the first member 98. It has a divided structure with

The first member 98 includes a substantially cylindrical peripheral wall 102 and an annular plate-shaped plate contact portion 104 protruding from the peripheral wall 102 toward the inner periphery. The plate contact portion 104 is not necessarily limited to a ring plate shape that is continuous over the entire circumference, and may be partially provided in the circumferential direction of the peripheral wall 102, for example. The filter unit 86 is inserted into the inner peripheral side of the peripheral wall 102 of the first member 98 , and the plate-like portion 96 of the filter unit 86 is superimposed on the front surface of the plate contact portion 104 of the first member 98 . Relative movement of the filter unit 86 in the radial direction with respect to the first member 98 is restricted by contact between the plate-like portion 96 and the peripheral wall 102 .

The second member 100 includes a tubular wall portion 106 and a front wall portion 108 that covers the front opening of the tubular wall portion 106, and has a substantially bottomed cylindrical shape as a whole. A plurality of ventilation holes 110 are formed through the front wall portion 108 . The opening shape of the vent hole 110 is not particularly limited, but in the present embodiment, as shown in FIG. It is

The tubular wall portion 106 of the second member 100 is detachably connected to the peripheral wall 102 of the first member 98 . The connection structure of the first member 98 and the second member 100 is such that, for example, the cylindrical wall portion 106 of the second member 100 is inserted into the peripheral wall 102 of the first member 98 and protrudes from the inner peripheral surface of the peripheral wall 102. The inner peripheral protrusion 112 of the first member 98 and the outer peripheral protrusion 114 of the second member 100 protruding to the outer peripheral surface of the cylindrical wall portion 106 are locked in the front-rear direction. In such a connecting structure, for example, the peripheral wall 102 of the first member 98 is diametrically deformed to expand, or the cylindrical wall 106 of the second member 100 is diametrically contracted, so that the inner peripheral protrusion 112 and the outer peripheral protrusion are connected. The second member 100 can be removed from the first member 98 by releasing the engagement with the portion 114 . Note that the detachable connecting structure of the first member 98 and the second member 100 is not limited to the structure illustrated in FIGS. Specifically, for example, connection by fitting a concave portion (including a concave groove or a through hole) and a convex portion provided in each one of the peripheral wall 102 and the cylindrical wall portion 106, connection by a screw structure, and connection to the peripheral wall 102 Connection by frictional resistance by fitting the cylindrical wall portion 106 may be adopted.

The rear end of the cylindrical wall portion 106 of the second member 100 is pressed against the plate-shaped portion 96 of the filter unit 86 from the front, and the plate-shaped portion 96 is positioned between the plate contact portion 104 of the first member 98 and the second member. It is sandwiched between the cylindrical wall portion 106 of 100 . As a result, the overlapping surfaces of the plate contact portion 104 of the first member 98 and the plate-like portion 96 of the filter unit 86 are airtightly sealed, and outside air bypasses the filter member 88 to It is designed not to enter the inner circumference of the A position defining portion 116 that protrudes outward is provided on the cylindrical wall portion 106 of the second member 100 . Since the relative positions of the first member 98 and the second member 100 in the front-rear direction are defined, the compressive force acting on the plate-shaped portion 96 (the amount of compressive deformation of the plate-shaped portion 96) is appropriately set.

In the filter unit 86, the plate-like portion 96 of the support 92 is sandwiched between the first member 98 and the second member 100, while the portion other than the plate-like portion 96 is separated from the first member 98 and the second member 100. ing. In particular, the plate contact portion 104 of the first member 98 is arranged at a position away from the filter member 88 on the outer periphery, and the front wall portion 108 of the second member 100 is separated forward from the filter member 88. are placed in the same position. Thereby, the effective surface area of the filter member 88 is efficiently secured.

The face contact member 16 is attached to the rear end portion of the filter support member 14 housing the filter unit 86, as described above. The connecting portion between the filter support member 14 and the face contact member 16 is stably and airtightly sealed by the facepiece connecting structure 10 .

A band 84 is attached to the filter support member 14 . The band 84 is belt-shaped or string-shaped, and preferably has stretchability, so that the load during wearing can be reduced. The band 84 is inserted through a band insertion portion 118 provided on the filter support member 14 . As shown in FIGS. 8 and 9, the band insertion portions 118 are desirably provided on both left and right sides of the filter support member 14, for example, at the rear end portion of the first member 98. As shown in FIGS. The left and

right bands

84, 84 inserted through the band insertion portion 118 are releasably connected around the wearer's head and neck, so that the mask main body 82 can be removed from the wearer's face. It is worn in a suitable manner. The means for connecting the left and

right bands

84, 84 is not particularly limited, and the left and

right bands

84, 84 may be connected by tying them together, or the left and

right bands

84, 84 may have a connecting structure such as a buckle in advance. may be provided. Also, the band 84 inserted through the left and right

band insertion portions

118, 118 may be integrally connected. Ease and the ability to hold the mask body 82 in place can be achieved.

Then, when the mask main body 82 is worn so as to cover the mouth and nose of the wearer, outside air entering the filter support member 14 through the ventilation holes 110 of the front wall portion 108 of the second member 100 is released into the filter member 88 . is filtered, moves into the face-contacting body 16, and is inhaled by the wearer. As a result, foreign substances such as viruses and dust in the outside air are removed by the filter member 88, and clean air can be provided to the wearer. In particular, by applying the mask facepiece connection structure 10 to the connecting portion between the filter supporting member 14 and the face contacting member 16, excellent sealing is achieved at the connecting portion between the hard filter supporting member 14 and the soft face contacting member 16. Since the performance is stably realized, it is possible to effectively obtain the effect of the facepiece connection structure 10, such as stably exhibiting excellent foreign matter removal performance.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the specific descriptions. For example, the sandwiching protrusion 24 of the filter support member 14 and the sandwiching cylinder portion 38 of the ring member 32 may be provided so that the sandwiching force (compressive force in the front-rear direction due to sandwiching) is exerted intensively on the seal portion 28 . is desirable, but such a clamping protrusion is not essential. Moreover, by providing a protruding portion such as a seal lip on the seal portion 28 side, the clamping force can be concentrated on the seal portion 28 .

In the above-described embodiment, the structure provided with a pair of retaining

projections

30a and 30b was exemplified. Only the retaining protrusion 30 may be provided. In this case, only one removal prevention structure is constructed by locking one removal prevention projection 30 and the clamping projection 24 of the filter support member 14 . It is also possible to eliminate the front retaining projection 30a and provide only the rear retaining projection 30b.

The retaining projection 30 in the above-described embodiment has a square cross section projecting with a substantially constant radial width dimension, but the shape of the retaining projection is limited as long as the retaining structure 49 can be formed by locking. not something.

The retaining projection 30 may be sandwiched, for example, between the filter support member 14 and the ring member 32 in the front-rear direction or radial direction. When the retaining projection 30 is sandwiched in the longitudinal direction, the sealing portion 28 is sandwiched with a force greater than that of the retaining projection 30 in the longitudinal direction in order to effectively obtain sealing performance due to sandwiching of the seal portion 28 .

The welding cavity 46 is not necessarily limited to one formed by superimposing a tapered surface and a cylindrical surface. Specifically, for example, in the first embodiment, the inner peripheral surface of the peripheral wall portion 22 is inclined toward the outer periphery toward the rear, and the inner peripheral surface of the peripheral wall portion 22 and the tapered surface 40 of the ring member 32 are formed. The welding cavity may be formed by a difference in inclination angle from the . Further, for example, by replacing the tapered surface 40 with the tapered surface 40 of the outer peripheral surface of the ring member 32, a stepped cylindrical surface having a step can be formed to form a welding cavity in which the width dimension in the radial direction changes stepwise. can. Note that the welding space may be formed with substantially constant internal dimensions.

Although the welding projections 42 are provided on the ring member 32 in the above embodiment, the welding projections 42 can also be provided on the filter support member 14 . Although the specific shape of the welding projection 42 is not particularly limited, it is preferably tapered. Further, the method of fixing the filter support member 14 and the ring member 32 is not limited to welding, and the ring member 32 can be fixed to the filter support member 14 without using the welding protrusions 42 . Specifically, the ring member 32 is accommodated in the inner periphery of the peripheral wall portion 22 of the filter support member 14, and the end portion of the peripheral wall portion 22 is deformed toward the inner peripheral side behind the ring member 32 to By pressing the ring member 32 against the face contact body 16 (sealing portion 28) by the end portion of the peripheral wall portion 22 protruding outward, the ring member 32 and the filter support member 14 sandwich the sealing portion 28 without using the welding protrusions 42. It can be configured to be compressed. When deforming the end portion of the peripheral wall portion 22 of the filter support member 14 toward the inner peripheral side, the manufacturing is facilitated by heating with ultrasonic waves or heat to facilitate deformation. In this embodiment, the ring member 32 and the filter support member 14 can be made of the same material and can be melted and integrated, or the ring member 32 and the filter support member 14 can be made of different materials.

10 Mask Facepiece Connection Structure (First Embodiment)
12 Facepiece 14 Filter support member 16 Face contact member 18 Ring housing portion 20 Bottom wall portion 22 Peripheral wall portion 24 Clamping protrusion 26 Cylindrical surface 28 Seal portion 30 Retaining protrusion 32 Ring member 34 Base portion 36 Supporting cylinder portion (annular protrusion )
38 Cylinder holding portion 39 Guide portion 40 Tapered surface 42 Welding projection 44 Welding portion 45 Gap 46 Welding space 47 Narrowed region 48 Accommodating space 49 Retaining structure 50 Connecting structure for mask face piece (second embodiment)
52 Filter support member 54 Ring member 56 Peripheral wall portion 57 Inclined surface 58 Support cylinder portion 60 Mask facepiece connection structure (third embodiment)
62 Ring member 64 First guide part 66 Second guide part 70 Connection structure for mask face piece (fourth embodiment)
72 ring member 80 mask 82 mask body 84 band 86 filter unit 88 filter member 90 filter sheet 92 support 94 frame portion 96 plate-like portion 98 first member 100 second member 102 peripheral wall 104 plate contact portion 106 cylindrical wall portion 108 Front wall portion 110 Vent hole 112 Inner peripheral protrusion 114 Outer peripheral protrusion 116 Position defining portion 118 Band insertion portion A Wearer

Claims

The mask includes a hard filter support member to which the filter member is attached, and an annular face contact body that is softer than the filter support member and contacts the mask wearer's face,
The filter support member and the face contact member are connected by a ring member that is harder than the face contact member and fixed to the filter support member,
An annular seal portion integrally provided around the face contact member is sandwiched and compressed over the entire circumference between the filter support member and the ring member, and the face contact member and the filter support member are compressed. connecting structure for the face piece of the mask, the connecting portion of which is sealed.
The ring member and the filter support member have an accommodation space for accommodating the outer peripheral end of the face contact member, and the cross-sectional area of the outer peripheral end of the face contact member before being assembled to the ring member and the filter support member is 2. The connecting structure for a mask facepiece according to claim 1, wherein the cross-sectional area is smaller than that of the accommodating space.
The mask includes a hard filter support member to which the filter member is attached, and an annular face contact body that is softer than the filter support member and contacts the mask wearer's face,
The filter support member and the face contact member are connected by a ring member that is harder than the face contact member and is welded and fixed to the filter support member,
An annular seal portion integrally provided around the face contact member is sandwiched over the entire circumference between the filter support member and the ring member, thereby connecting the face contact member and the filter support member. while it is sealed
The mask face piece connecting structure, wherein the ring member has a guide portion which is in proximity to or abuts on the outer peripheral surface or the inner peripheral surface of the filter support member.
The mask includes a hard filter support member to which the filter member is attached, and an annular face contact body that is softer than the filter support member and contacts the mask wearer's face,
The filter support member and the face contact member are connected by a ring member that is harder than the face contact member and is welded and fixed to the filter support member,
An annular seal portion integrally provided around the face contact member is sandwiched over the entire circumference between the filter support member and the ring member, thereby connecting the face contact member and the filter support member. while it is sealed
The ring member has an annular projecting portion projecting toward the filter support member side in the sandwiching direction of the seal portion,
The annular projecting portion of the ring member and the filter support member are provided with a welding portion that is overlapped and welded in the sandwiching direction of the seal portion,
The welded portion is located closer to the filter support member than the seal portion or closer to the outer periphery than the outer peripheral end of the face contact member in the sandwiching direction of the seal portion.
The mask includes a hard filter support member to which the filter member is attached, and an annular face contact body that is softer than the filter support member and contacts the mask wearer's face,
The filter support member and the face contact member are connected by a ring member that is harder than the face contact member and is welded and fixed to the filter support member,
An annular seal portion integrally provided around the face contact member is sandwiched over the entire circumference between the filter support member and the ring member, thereby connecting the face contact member and the filter support member. while it is sealed
The ring member and the filter support member are overlapped and welded together in the sandwiching direction of the seal portion, and
The ring member is in close proximity to or in contact with the filter support member in a direction perpendicular to the sandwiching direction of the seal portion at an outer periphery beyond the welded portion, and between the ring member and the filter support member. is a connection structure for mask facepieces in which welding cavities are formed.
6. The mask face piece connection structure according to claim 5, wherein the inner dimension of the welding space is reduced in the sandwiching direction of the seal portion as the distance from the welding portion increases.
The filter includes a hard filter support member to which the filter member is attached, and an annular face contact body that is softer than the filter support member and contacts the mask wearer's face,
The filter support member and the face contact member are connected by a ring member that is harder than the face contact member and is welded and fixed to the filter support member,
An annular seal portion integrally provided around the face contact member is sandwiched over the entire circumference between the filter support member and the ring member to seal the joint between the face contact member and the filter support member. while it is sealed
A retaining protrusion projecting in a direction in which the seal portion is sandwiched between the filter support member and the ring member is provided on the face contact body at an outer periphery of the seal portion,
A connecting structure for a facepiece of a mask, wherein at least one of the filter support member and the ring member engages with the retaining protrusion to restrict movement of the seal portion toward the inner circumference.
The connecting structure for a mask face piece according to claim 7, wherein the seal portion is sandwiched between the filter support member and the ring member with a force greater than that of the retaining protrusion.
The connection structure for a mask face piece according to any one of claims 1 to 8, wherein a gap is formed between the inner peripheral surface of the ring member and the face contact member.