CA2718085C - Separably assembled filtering respirator - Google Patents
Separably assembled filtering respirator Download PDFInfo
- Publication number
- CA2718085C CA2718085C CA 2718085 CA2718085A CA2718085C CA 2718085 C CA2718085 C CA 2718085C CA 2718085 CA2718085 CA 2718085 CA 2718085 A CA2718085 A CA 2718085A CA 2718085 C CA2718085 C CA 2718085C
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- CA
- Canada
- Prior art keywords
- seat
- exhalation valve
- nonwoven fabric
- main body
- sleeve portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
- A62B18/02—Masks
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B23/00—Filters for breathing-protection purposes
- A62B23/02—Filters for breathing-protection purposes for respirators
Abstract
A filtering respirator includes a main body, a nonwoven fabric lining removably spread in the main body, and an exhalation valve assembled from a front seat, a diaphragm, a middle seat, and a rear seat. The front seat is located in front of the main body; and the diaphragm and the middle seat are sequentially disposed in the nonwoven fabric lining. The middle seat has a front sleeve portion extended through two aligned central openings on the main body and the nonwoven fabric lining to tightly fit in the front seat; and the rear seat is screwed to a rear sleeve portion of the middle seat.
Therefore, the exhalation valve can be easily disassembled from the main body to allow replacement of the nonwoven fabric lining while the main body and the components of the exhalation valve can be repeatedly used to meet ecological and economical requirements.
Therefore, the exhalation valve can be easily disassembled from the main body to allow replacement of the nonwoven fabric lining while the main body and the components of the exhalation valve can be repeatedly used to meet ecological and economical requirements.
Description
SEPARABLY ASSEMBLED FILTERING RESPIRATOR
FIELD OF THE INVENTION
The present invention relates to a filtering respirator, and more particularly to a filtering respirator including an exhalation valve, components of which are separably assembled to a main body and a nonwoven fabric lining of the respirator, allowing easy detachment of the nonwoven fabric lining from the main body for the purpose of replacement.
BACKGROUND OF THE INVENTION
To avoid inhaling pollutants in the air, people working in highly contaminated or polluted environments must wear a filtering respirator or face mask.
Currently, there are many different filtering respirators and face masks available in the market.
These filtering respirators or face masks can be generally divided into two categories according to the structure of an exhalation valve and a main body thereof.
The first type of the currently available filtering respirators or face masks includes integrally formed exhalation valve and main body, such as the exhalation valve and the filtering face mask disclosed in US Patent No. 5325892. A main disadvantage of the filtering face mask disclosed in US5325892 is that the filtering face mask is not repeatedly usable because the exhalation valve is integrally formed with a main body of the filtering face mask. In other words, the exhalation valve and the main body of the used filtering face mask must be discarded at the same time to therefore cause more problems in environmental protection and increase the consumers' burden.
The second type of the currently available filtering respirators or face masks includes separable exhalation valve, filtering piece, and mask main body, such as the replaceable filter respirator disclosed in US Patent No. 4630604.
While the replaceable filter respirator disclosed in US Patent No. 4630604 includes a layer of replaceable filter material as well as reusable exhalation valve and respirator main body, it disadvantageously includes a main body made of a non-breathable material with relatively poor softness, such as a rubber material.
Such rubber-made respirator main body fails to fitly contact with the user's face and does not absorb sweat, and is therefore less comfortable for wearing.
The replaceable filter respirator disclosed in US Patent No. 4630604 also includes complicated components and accordingly requires increased manufacturing cost.
It is therefore tried by the inventor to develop a filtering respirator with separable parts, so as to overcome the disadvantages in the prior art respirators or face masks.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a filtering respirator that allows easy replacement of a face covering portion of the filtering respirator while a main body and an exhalation valve of the filtering respirator are repeatedly usable to meet ecological and economical requirements.
Another object of the present invention is to provide a filtering respirator that includes separably assembled components and has a lining made of a breathable nonwoven fabric that is soft and comfortable in touch and can more fitly contact with a wearer's face.
FIELD OF THE INVENTION
The present invention relates to a filtering respirator, and more particularly to a filtering respirator including an exhalation valve, components of which are separably assembled to a main body and a nonwoven fabric lining of the respirator, allowing easy detachment of the nonwoven fabric lining from the main body for the purpose of replacement.
BACKGROUND OF THE INVENTION
To avoid inhaling pollutants in the air, people working in highly contaminated or polluted environments must wear a filtering respirator or face mask.
Currently, there are many different filtering respirators and face masks available in the market.
These filtering respirators or face masks can be generally divided into two categories according to the structure of an exhalation valve and a main body thereof.
The first type of the currently available filtering respirators or face masks includes integrally formed exhalation valve and main body, such as the exhalation valve and the filtering face mask disclosed in US Patent No. 5325892. A main disadvantage of the filtering face mask disclosed in US5325892 is that the filtering face mask is not repeatedly usable because the exhalation valve is integrally formed with a main body of the filtering face mask. In other words, the exhalation valve and the main body of the used filtering face mask must be discarded at the same time to therefore cause more problems in environmental protection and increase the consumers' burden.
The second type of the currently available filtering respirators or face masks includes separable exhalation valve, filtering piece, and mask main body, such as the replaceable filter respirator disclosed in US Patent No. 4630604.
While the replaceable filter respirator disclosed in US Patent No. 4630604 includes a layer of replaceable filter material as well as reusable exhalation valve and respirator main body, it disadvantageously includes a main body made of a non-breathable material with relatively poor softness, such as a rubber material.
Such rubber-made respirator main body fails to fitly contact with the user's face and does not absorb sweat, and is therefore less comfortable for wearing.
The replaceable filter respirator disclosed in US Patent No. 4630604 also includes complicated components and accordingly requires increased manufacturing cost.
It is therefore tried by the inventor to develop a filtering respirator with separable parts, so as to overcome the disadvantages in the prior art respirators or face masks.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a filtering respirator that allows easy replacement of a face covering portion of the filtering respirator while a main body and an exhalation valve of the filtering respirator are repeatedly usable to meet ecological and economical requirements.
Another object of the present invention is to provide a filtering respirator that includes separably assembled components and has a lining made of a breathable nonwoven fabric that is soft and comfortable in touch and can more fitly contact with a wearer's face.
= To achieve the above and other objects, the filtering respirator according to the present invention includes a main body, a nonwoven fabric lining, and an exhalation valve.
The main body includes a forward protruded grid-like member defining a space therein, and an outward bent first edge portion of a predetermined length formed along a periphery of the grid-like member.
Two pairs of strap holes are symmetrically provided on two opposite ends of the first edge portion, so that two elastic straps may be separately extended through the two pairs of strap holes to serve as two ear loops or head straps. The forward protruded grid-like member is provided at a front central position with a first central opening.
The nonwoven fabric lining includes a forward protruded face covering portion made of a nonwoven fabric material with a predetermined thickness and having a configuration corresponding to that of the main body, and an outward bent second edge portion of a predetermined length formed along a periphery of the face covering portion. The face covering portion of the nonwoven fabric lining is provided at a front central position with a second central opening. To assemble the nonwoven fabric lining to the main body, the face covering portion is laid over an inner side of the grid-like member, such that the second central opening on the face covering portion is aligned with the first central opening on the grid-like member and the second edge portion of the nonwoven fabric lining is correspondingly attached to the first edge portion of the main body.
The exhalation valve is assembled from a front seat, a diaphragm, a middle seat, and a rear seat.
The main body includes a forward protruded grid-like member defining a space therein, and an outward bent first edge portion of a predetermined length formed along a periphery of the grid-like member.
Two pairs of strap holes are symmetrically provided on two opposite ends of the first edge portion, so that two elastic straps may be separately extended through the two pairs of strap holes to serve as two ear loops or head straps. The forward protruded grid-like member is provided at a front central position with a first central opening.
The nonwoven fabric lining includes a forward protruded face covering portion made of a nonwoven fabric material with a predetermined thickness and having a configuration corresponding to that of the main body, and an outward bent second edge portion of a predetermined length formed along a periphery of the face covering portion. The face covering portion of the nonwoven fabric lining is provided at a front central position with a second central opening. To assemble the nonwoven fabric lining to the main body, the face covering portion is laid over an inner side of the grid-like member, such that the second central opening on the face covering portion is aligned with the first central opening on the grid-like member and the second edge portion of the nonwoven fabric lining is correspondingly attached to the first edge portion of the main body.
The exhalation valve is assembled from a front seat, a diaphragm, a middle seat, and a rear seat.
The front seat includes a forward protruded head portion internally defining a rearward opened inner space, a hollow central post rearward projected from an inner side of the head portion, a plurality of vents spaced along a side wall of the head portion, an outward bent first flange portion having a predetermined thickness and extended around a rear rim of the head portion, and a forward tapered inner wall surface formed in the front seat between the head portion and the first flange portion.
The diaphragm is a thin disc made of a rubber material, and is provided at a center with a pin hole.
The middle seat includes a forward protruded front sleeve portion and a backward protruded rear sleeve portion, which have identical inner diameter; a radially outward extended second flange portion having a predetermined thickness and located between the front and the rear sleeve portion; a rubber cover molded on an outer side of the second flange portion; a forward tapered outer wall surface formed around the front sleeve portion; a plurality of spaced ribs radially extended in the front sleeve portion between an inner wall surface of the front sleeve portion and a pin holder formed at a center of the front sleeve portion; a pin fitted in the pin holder to forward project therefrom; and a plurality of screw threads formed around an outer surface of the rear sleeve portion.
The rear seat includes a rearward protruded and internally threaded sleeve portion adapted to screw to the screw threads on the outer surface of the rear sleeve portion of the middle seat, and an outward bent third flange portion having a predetermined thickness and located around a front end of the internally threaded sleeve portion.
The diaphragm is a thin disc made of a rubber material, and is provided at a center with a pin hole.
The middle seat includes a forward protruded front sleeve portion and a backward protruded rear sleeve portion, which have identical inner diameter; a radially outward extended second flange portion having a predetermined thickness and located between the front and the rear sleeve portion; a rubber cover molded on an outer side of the second flange portion; a forward tapered outer wall surface formed around the front sleeve portion; a plurality of spaced ribs radially extended in the front sleeve portion between an inner wall surface of the front sleeve portion and a pin holder formed at a center of the front sleeve portion; a pin fitted in the pin holder to forward project therefrom; and a plurality of screw threads formed around an outer surface of the rear sleeve portion.
The rear seat includes a rearward protruded and internally threaded sleeve portion adapted to screw to the screw threads on the outer surface of the rear sleeve portion of the middle seat, and an outward bent third flange portion having a predetermined thickness and located around a front end of the internally threaded sleeve portion.
With the above arrangements, the front seat of the exhalation valve cooperates with the middle seat and the rear seat of the exhalation valve to removably hold the main body and the nonwoven fabric lining between them, allowing the filtering respirator to be disassembled and assembled again at any time to facilitate easy replacement of the nonwoven fabric lining without the need of discarding the main body and the exhalation valve.
BRIEF DESCRIPTION OF THE DRAWINGS
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein Fig. 1 is an exploded perspective view of a filtering respirator according to a preferred embodiment of the present invention;
Figs. 2 and 3 are assembled rear and front perspective views, respectively, of the filtering respirator of the present invention shown in Fig. 1;
Figs. 4 and 5 are exploded rear and front perspective views, respectively, of an exhalation valve for the filtering respirator of the present invention;
Fig. 6 is an exploded cross-sectional view of the filtering respirator of the present invention;
Fig. 7 is an assembled view of Fig. 6 with a diaphragm of the exhalation valve in an opened position; and Fig. 8 is an assembled view of Fig. 6 with the diaphragm of the exhalation valve in a closed position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Please refer to Figs. 1 through 6. A filtering respirator according to a preferred embodiment of the present invention includes a main body 1, a nonwoven fabric lining 2, and an exhalation valve 3.
The main body 1 includes a forward protruded grid-like member 11 defining a space therein, and an outward bent first edge portion 12 of a predetermined length formed along a periphery of the grid-like member 11. Two pairs of strap holes 13, 14 are symmetrically provided on two opposite ends of the first edge portion 12, so that two elastic straps 15, 16 may be separately extended through the two pairs of strap holes 13, 14 to serve as two ear loops or head straps. The forward protruded grid-like member 11 is provided at a front central position with a first central opening 17.
The nonwoven fabric lining 2 includes a forward protruded face covering portion 21 made of a nonwoven fabric material with a predetermined thickness and having a configuration corresponding to that of the main body 1, and an outward bent second edge portion 22 of a predetermined length formed along a periphery of the face covering portion 21. The face covering portion 21 of the nonwoven fabric lining 2 is provided at a front central position with a second central opening 23 identical to the first central opening 17 in size. To assemble the nonwoven fabric lining 2 to the main body 1, the face covering portion 21 is laid over an inner side of the grid-like member 11, such that the second central opening 23 on the face covering portion 21 is aligned with the first central opening 17 on the grid-like member 11 and the second edge portion 22 of the nonwoven fabric lining 2 is correspondingly attached to the first edge portion 12 of the main body 1.
As can be clearly seen in Figs. 4 and 5, the exhalation valve 3 is assembled from a front seat 31, a diaphragm 32, a middle seat 33, and a rear seat 34.
The front seat 31 includes a forward protruded head portion 311 internally defining a rearward opened inner space, a hollow central post 312 rearward projected from an inner side of the head portion 311, a plurality of vents 313 spaced along a side wall of the head portion 311, an outward bent first flange portion 314 having a predetermined thickness and extended around a rear rim of the head portion 311, and a forward tapered inner wall surface 315 formed in the front seat 31 between the head portion 311 and the first flange portion 314.
The diaphragm 32 is a thin disc made of a rubber material, and is provided at a center with a pin hole 321.
The middle seat 33 includes a forward protruded front sleeve portion 331 and a backward protruded rear sleeve portion 332, which have identical inner diameter; a radially outward extended second flange portion 333 having a predetermined thickness and located between the front and the rear sleeve portion 331, 332;
a rubber cover 334 molded on an outer side of the second flange portion 333; a forward tapered outer wall surface 335 formed around the front sleeve portion 331; a plurality of spaced ribs 338 radially extended in the front sleeve portion 331 between an inner wall surface 339 of the front sleeve portion 331 and a pin holder 336 formed at a center of the front sleeve portion 331; a pin 337 fitted in the pin holder 336 to forward project therefrom; and a plurality of screw threads 330 formed around an outer surface of the rear sleeve portion 332.
The rear seat 34 includes a rearward protruded and internally threaded sleeve portion 341 adapted to screw to the screw threads 330 on the outer surface of the rear sleeve portion 332 of the middle seat 33, and an outward bent third flange portion having a predetermined thickness and located around a front end of the internally threaded sleeve portion 341.
As can be seen in Figs. 1 to 6, to assemble the filtering respirator of the present invention, first spread the face covering portion 21 of the nonwoven fabric lining 2 on the inner side of the grid-like member 11 of the main body 1, such that the second central opening 23 at the front end of the face covering portion 21 of the nonwoven fabric lining 2 is aligned with the first central opening 17 at the front end of the grid-like member 11 of the main body 1, and the second edge portion 22 of the nonwoven fabric lining 2 is correspondingly attached to the first edge portion 12 of the main body 1. Then, put the front seat 31 of the exhalation valve 3 in front of the main body 1 with the first flange portion 314 of the front seat 31 located around the aligned first and second central openings 17, 23 on the main body 1 and the lining 2, respectively. Thereafter, sequentially put the diaphragm 32 and the middle seat 33 of the exhalation valve 3 in the face covering portion 21 of the nonwoven fabric lining 2 to locate them in the aligned first and second central openings 17 and 23, such that the centered pin hole 321 on the diaphragm 32 is fitted around the pin holder 336 on the middle seat 33. Then, apply a forward force to push the forward tapered outer wall surface 335 on the front sleeve portion 331 of the middle seat 33 into the forward tapered inner wall surface 315 in the front seat 31 between the head portion 311 and the first flange portion 314, so that the front sleeve portion 331 of the middle seat 33 with the diaphragm 32 fitted around the pin holder 336 is tightly fitted in the front seat 31 to unite with the latter, and the pin 337 is received in the hollow central post 312 in the head portion 311 of the front seat 31. Finally, fully tighten the internally threaded sleeve portion 341 of the rear seat 34 to the screw threads 330 on the outer surface of the rear sleeve portion 332 of the middle seat 33, so that the exhalation valve 3, the main body 1, and the nonwoven fabric lining 2 are joined together to form the filtering respirator of the present invention. On the other hand, the rear seat 34 of the exhalation valve 3 can be loosened and separated from the middle seat 33 at any time, and the contact surfaces between the front seat 31 and the middle seat 33, that is, the forward tapered inner wall surface 315 in the front seat 31 and the forward tapered outer wall surface 335 on the outer side of the front sleeve portion 331 of the middle seat 33, can be pulled apart from each other, allowing the exhalation valve 3, the main body 1, and the nonwoven fabric lining 2 to be quickly separated from one another. At this point, a new nonwoven fabric lining 2 can be used to replace the old one, and the exhalation valve 3, the main body 1 and the new nonwoven fabric lining 2 can be assembled again for use.
Figs. 7 and 8 show the assembled filtering respirator of the present invention in use.
As shown, when a user wearing the filtering respirator of the present invention exhales, the diaphragm 32 of the exhalation valve 3 is pushed forward by the air breathed out, allowing the air to flow out of the respirator via the vents 313 on the side wall of the front seat 31 of the exhalation valve 3. On the other hand, when the user inhales, the diaphragm 32 is sucked backward to close the respirator.
BRIEF DESCRIPTION OF THE DRAWINGS
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein Fig. 1 is an exploded perspective view of a filtering respirator according to a preferred embodiment of the present invention;
Figs. 2 and 3 are assembled rear and front perspective views, respectively, of the filtering respirator of the present invention shown in Fig. 1;
Figs. 4 and 5 are exploded rear and front perspective views, respectively, of an exhalation valve for the filtering respirator of the present invention;
Fig. 6 is an exploded cross-sectional view of the filtering respirator of the present invention;
Fig. 7 is an assembled view of Fig. 6 with a diaphragm of the exhalation valve in an opened position; and Fig. 8 is an assembled view of Fig. 6 with the diaphragm of the exhalation valve in a closed position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Please refer to Figs. 1 through 6. A filtering respirator according to a preferred embodiment of the present invention includes a main body 1, a nonwoven fabric lining 2, and an exhalation valve 3.
The main body 1 includes a forward protruded grid-like member 11 defining a space therein, and an outward bent first edge portion 12 of a predetermined length formed along a periphery of the grid-like member 11. Two pairs of strap holes 13, 14 are symmetrically provided on two opposite ends of the first edge portion 12, so that two elastic straps 15, 16 may be separately extended through the two pairs of strap holes 13, 14 to serve as two ear loops or head straps. The forward protruded grid-like member 11 is provided at a front central position with a first central opening 17.
The nonwoven fabric lining 2 includes a forward protruded face covering portion 21 made of a nonwoven fabric material with a predetermined thickness and having a configuration corresponding to that of the main body 1, and an outward bent second edge portion 22 of a predetermined length formed along a periphery of the face covering portion 21. The face covering portion 21 of the nonwoven fabric lining 2 is provided at a front central position with a second central opening 23 identical to the first central opening 17 in size. To assemble the nonwoven fabric lining 2 to the main body 1, the face covering portion 21 is laid over an inner side of the grid-like member 11, such that the second central opening 23 on the face covering portion 21 is aligned with the first central opening 17 on the grid-like member 11 and the second edge portion 22 of the nonwoven fabric lining 2 is correspondingly attached to the first edge portion 12 of the main body 1.
As can be clearly seen in Figs. 4 and 5, the exhalation valve 3 is assembled from a front seat 31, a diaphragm 32, a middle seat 33, and a rear seat 34.
The front seat 31 includes a forward protruded head portion 311 internally defining a rearward opened inner space, a hollow central post 312 rearward projected from an inner side of the head portion 311, a plurality of vents 313 spaced along a side wall of the head portion 311, an outward bent first flange portion 314 having a predetermined thickness and extended around a rear rim of the head portion 311, and a forward tapered inner wall surface 315 formed in the front seat 31 between the head portion 311 and the first flange portion 314.
The diaphragm 32 is a thin disc made of a rubber material, and is provided at a center with a pin hole 321.
The middle seat 33 includes a forward protruded front sleeve portion 331 and a backward protruded rear sleeve portion 332, which have identical inner diameter; a radially outward extended second flange portion 333 having a predetermined thickness and located between the front and the rear sleeve portion 331, 332;
a rubber cover 334 molded on an outer side of the second flange portion 333; a forward tapered outer wall surface 335 formed around the front sleeve portion 331; a plurality of spaced ribs 338 radially extended in the front sleeve portion 331 between an inner wall surface 339 of the front sleeve portion 331 and a pin holder 336 formed at a center of the front sleeve portion 331; a pin 337 fitted in the pin holder 336 to forward project therefrom; and a plurality of screw threads 330 formed around an outer surface of the rear sleeve portion 332.
The rear seat 34 includes a rearward protruded and internally threaded sleeve portion 341 adapted to screw to the screw threads 330 on the outer surface of the rear sleeve portion 332 of the middle seat 33, and an outward bent third flange portion having a predetermined thickness and located around a front end of the internally threaded sleeve portion 341.
As can be seen in Figs. 1 to 6, to assemble the filtering respirator of the present invention, first spread the face covering portion 21 of the nonwoven fabric lining 2 on the inner side of the grid-like member 11 of the main body 1, such that the second central opening 23 at the front end of the face covering portion 21 of the nonwoven fabric lining 2 is aligned with the first central opening 17 at the front end of the grid-like member 11 of the main body 1, and the second edge portion 22 of the nonwoven fabric lining 2 is correspondingly attached to the first edge portion 12 of the main body 1. Then, put the front seat 31 of the exhalation valve 3 in front of the main body 1 with the first flange portion 314 of the front seat 31 located around the aligned first and second central openings 17, 23 on the main body 1 and the lining 2, respectively. Thereafter, sequentially put the diaphragm 32 and the middle seat 33 of the exhalation valve 3 in the face covering portion 21 of the nonwoven fabric lining 2 to locate them in the aligned first and second central openings 17 and 23, such that the centered pin hole 321 on the diaphragm 32 is fitted around the pin holder 336 on the middle seat 33. Then, apply a forward force to push the forward tapered outer wall surface 335 on the front sleeve portion 331 of the middle seat 33 into the forward tapered inner wall surface 315 in the front seat 31 between the head portion 311 and the first flange portion 314, so that the front sleeve portion 331 of the middle seat 33 with the diaphragm 32 fitted around the pin holder 336 is tightly fitted in the front seat 31 to unite with the latter, and the pin 337 is received in the hollow central post 312 in the head portion 311 of the front seat 31. Finally, fully tighten the internally threaded sleeve portion 341 of the rear seat 34 to the screw threads 330 on the outer surface of the rear sleeve portion 332 of the middle seat 33, so that the exhalation valve 3, the main body 1, and the nonwoven fabric lining 2 are joined together to form the filtering respirator of the present invention. On the other hand, the rear seat 34 of the exhalation valve 3 can be loosened and separated from the middle seat 33 at any time, and the contact surfaces between the front seat 31 and the middle seat 33, that is, the forward tapered inner wall surface 315 in the front seat 31 and the forward tapered outer wall surface 335 on the outer side of the front sleeve portion 331 of the middle seat 33, can be pulled apart from each other, allowing the exhalation valve 3, the main body 1, and the nonwoven fabric lining 2 to be quickly separated from one another. At this point, a new nonwoven fabric lining 2 can be used to replace the old one, and the exhalation valve 3, the main body 1 and the new nonwoven fabric lining 2 can be assembled again for use.
Figs. 7 and 8 show the assembled filtering respirator of the present invention in use.
As shown, when a user wearing the filtering respirator of the present invention exhales, the diaphragm 32 of the exhalation valve 3 is pushed forward by the air breathed out, allowing the air to flow out of the respirator via the vents 313 on the side wall of the front seat 31 of the exhalation valve 3. On the other hand, when the user inhales, the diaphragm 32 is sucked backward to close the respirator.
Claims (14)
1. A separably assembled filtering respirator, comprising:
a main body including a forward protruded grid-like member defining an inner space, and an outward bent first edge portion provided on a periphery of the grid-like member; the first edge portion being symmetrically provided at two opposite ends with two pairs of strap holes, so that two elastic straps may be separately extended through the two pairs of strap holes to provide two ear loops or head straps; and a first central opening being provided on the grid-like member at a front central position thereof;
a nonwoven fabric lining including a forward protruded face covering portion made of a nonwoven fabric material of a predetermined thickness, and an outward bent second edge portion formed along a periphery of the face covering portion;
and a second central opening being provided on the face covering portion at a second front central position thereof; and an exhalation valve being assembled from a front seat, a diaphragm, a middle seat, and a rear seat;
wherein the face covering portion of the nonwoven fabric lining is laid over an inner side of the grid-like member, such that the second central opening on the nonwoven fabric lining is aligned with the first central opening on the main body and the second edge portion of the nonwoven fabric lining is correspondingly attached to the first edge portion of the main body; and wherein the exhalation valve is connected to the main body and the nonwoven fabric lining at the aligned first and second central openings.
a main body including a forward protruded grid-like member defining an inner space, and an outward bent first edge portion provided on a periphery of the grid-like member; the first edge portion being symmetrically provided at two opposite ends with two pairs of strap holes, so that two elastic straps may be separately extended through the two pairs of strap holes to provide two ear loops or head straps; and a first central opening being provided on the grid-like member at a front central position thereof;
a nonwoven fabric lining including a forward protruded face covering portion made of a nonwoven fabric material of a predetermined thickness, and an outward bent second edge portion formed along a periphery of the face covering portion;
and a second central opening being provided on the face covering portion at a second front central position thereof; and an exhalation valve being assembled from a front seat, a diaphragm, a middle seat, and a rear seat;
wherein the face covering portion of the nonwoven fabric lining is laid over an inner side of the grid-like member, such that the second central opening on the nonwoven fabric lining is aligned with the first central opening on the main body and the second edge portion of the nonwoven fabric lining is correspondingly attached to the first edge portion of the main body; and wherein the exhalation valve is connected to the main body and the nonwoven fabric lining at the aligned first and second central openings.
2. The filtering respirator as claimed in claim 1, wherein the front seat of the exhalation valve includes a forward protruded head portion internally defining a rearward opened inner space, a hollow central post rearward projected from an inner side of the head portion, and a plurality of vents spaced along a side wall of the head portion.
3. The filtering respirator as claimed in claim 2, wherein the front seat of the exhalation valve further includes a first flange portion having a predetermined thickness and extended around a rear rim of the head portion.
4. The filtering respirator as claimed in claim 3, wherein the front seat of the exhalation valve further includes a forward tapered inner wall surface formed in the front seat between the head portion and the first flange portion.
5. The filtering respirator as claimed in claim 4, wherein the diaphragm is a thin disk made of a rubber material, and is formed at a central position with a pin hole.
6. The filtering respirator as claimed in claim 5, wherein the middle seat of the exhalation valve includes a forward protruded front sleeve portion and a backward protruded rear sleeve portion, which have identical inner diameter; and a radially outward extended second flange portion having a predetermined thickness and located between the front and the rear sleeve portion.
7. The filtering respirator as claimed in claim 6, wherein the middle seat of the exhalation valve further includes a forward tapered outer wall surface formed around the front sleeve portion.
8. The filtering respirator as claimed in claim 6, wherein the second flange portion has a rubber cover molded on an outer side thereof.
9. The filtering respirator as claimed in claim 7, wherein the middle seat of the exhalation valve further includes a pin holder formed at a center of the front sleeve portion; and a pin fitted in the pin holder to forward project therefrom.
10. The filtering respirator as claimed in claim 9, wherein the middle seat of the exhalation valve further includes a plurality of spaced ribs radially extended in the front sleeve portion between an inner wall surface of the front sleeve portion and the pin holder.
11. The filtering respirator as claimed in claim 10, wherein the rear sleeve portion of the middle seat of the exhalation valve has a plurality of screw threads formed around an outer surface thereof.
12. The filtering respirator as claimed in claim 11, wherein the rear seat of the exhalation valve includes a rearward protruded and internally threaded sleeve portion adapted to screw to the screw threads on the outer surface of the rear sleeve portion of the middle seat.
13. The filtering respirator as claimed in claim 12, wherein the rear seat further includes a third flange portion having a predetermined thickness and located around a front end of the internally threaded sleeve portion.
14. The filtering respirator as claimed in claim 13, wherein the exhalation valve is removably connected to the main body and the nonwoven fabric lining in such a manner that the front seat of the exhalation valve is externally disposed in front of the main body and the nonwoven fabric lining with the first flange portion located around the aligned first and second central openings; the diaphragm and the middle seat of the exhalation valve are sequentially disposed in the face covering portion of the nonwoven fabric lining to locate in the aligned first and second central openings; the pin hole of the diaphragm is fitted around the pin holder provided on the middle seat; the forward tapered outer wall surface of the front sleeve portion of the middle seat is forwardly tightly fitted in the forward tapered inner wall surface of the front seat and the pin in the front sleeve portion of the middle seat is fitted in the hollow central post in the front seat for the middle seat and the front seat to unite with each other; and the rear seat is connected at the internally threaded sleeve portion to the externally threaded outer surface of the rear sleeve portion of the middle seat to tightly screw to the middle seat;
whereby the exhalation valve, the main body, and the nonwoven fabric lining are joined together to form the filtering respirator while the nonwoven fabric lining can be detached from the main body form replacement by loosening the middle and rear seats from the front seat of the exhalation valve.
whereby the exhalation valve, the main body, and the nonwoven fabric lining are joined together to form the filtering respirator while the nonwoven fabric lining can be detached from the main body form replacement by loosening the middle and rear seats from the front seat of the exhalation valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2718085 CA2718085C (en) | 2010-10-20 | 2010-10-20 | Separably assembled filtering respirator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2718085 CA2718085C (en) | 2010-10-20 | 2010-10-20 | Separably assembled filtering respirator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2718085A1 CA2718085A1 (en) | 2012-04-20 |
| CA2718085C true CA2718085C (en) | 2013-07-02 |
Family
ID=45956780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2718085 Expired - Fee Related CA2718085C (en) | 2010-10-20 | 2010-10-20 | Separably assembled filtering respirator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2718085C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021186036A1 (en) * | 2020-03-20 | 2021-09-23 | Universiteit Antwerpen | Valve system for a medical grade mouth mask |
-
2010
- 2010-10-20 CA CA 2718085 patent/CA2718085C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2718085A1 (en) | 2012-04-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20171020 |