US20140060550A1

US20140060550A1 - Detachable adjustable mouth mask

Info

Publication number: US20140060550A1
Application number: US13/604,793
Authority: US
Inventors: Chang-Hung Lai
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-09-06
Filing date: 2012-09-06
Publication date: 2014-03-06

Abstract

A detachable adjustable mouth mask includes a base frame member, a shade fastened to the base frame member to provide a curved, surface for covering over the user's mouth and nose, a chin support connector providing a clamping groove and friction ribs for fastening to the base frame member and lugs with radial teeth, a chin support providing connection members pivotally coupled to the lugs of the chin support connector with radial teeth thereof angularly adjustably engaged with the radial teeth of the chin support connector and a spacer block providing a ventilation passage for exhaust of exhaled air, and a pair of ear loops for securing the chin support to the user's ears.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a mask means for covering over the mouth and nose of a person to prevent spit flying and more particularly, to a detachable adjustable mouth mask, which allows adjustment of the elevation and tilting angle of the chin support and quick replacement of the shade.
2. Description of the Related Art
Many detachable adjustable mouth masks are commercially available for wearing by a person to prevent spit flying. According to conventional designs, the shade and chin support are arranged on one same axis. However, as the chin shape and length and the distance between the chin and the nose vary widely between people, the shade may be kept in close contact with the user's mouth and nose, affecting the user's speech clarity. In this case, the user's eyeglasses may fog up, interfering with the user's sight and breathing smoothness.

SUMMARY OF THE INVENTION

The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a detachable adjustable mouth mask consisting of a base frame member, a shade, a chin support, a chin support connector and a pair of ear loops, wherein the chin support connector comprises a clamping groove for detachably securing the base frame member for allowing replacement of the shade.
Further, the chin support connector comprises two lugs each defining a pivot hole; the chin support comprises two connection members each comprising a pivot pin. By means of coupling the pivot pins of the connection members of the chin support to the pivot holes of the lugs of the chin support connector, the chin support and the chin support connector are pivotally coupled together, allowing adjustment of the relative angular position between the chin support and the chin support connector.
Further, the chin support comprises two extension arms symmetrically extended from two opposite lateral sides thereof; the ear loops are respectively connected to the distal ends of the extension arms for hanging on the user's ears without interfering with angular adjustment between the chin support and the chin support connector.
Further, the chin support comprises a spacer block that defines with the chin support connector a ventilation passage for exhaust of exhaled air downwardly and rapidly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of as detachable adjustable mouth mask in accordance with a first embodiment of the present invention.

FIG. 2 is a schematic sectional assembly view of the detachable adjustable mouth mask in accordance with the first embodiment of the present invention.

FIG. 3 is a perspective assembly view of the detachable adjustable mouth mask in accordance with the first embodiment of the present invention.

FIG. 4 is an exploded view of a detachable adjustable mouth mask in accordance with a second embodiment of the present invention.

FIG. 5 is a perspective assembly view of the detachable adjustable mouth mask in accordance with the second embodiment of the present invention.

FIG. 6 is an exploded view of a detachable adjustable mouth mask in accordance with a third embodiment of the present invention.

FIG. 7 is an enlarged view of a part of FIG. 6.

FIG. 8 is a schematic sectional assembly view of the detachable adjustable mouth mask in accordance with the third embodiment of the present invention.

FIG. 9 is a perspective assembly view of the detachable adjustable mouth mask in accordance with the third embodiment of the present invention.

FIG. 10 is an exploded view of an alternate form of the detachable adjustable mouth mask in accordance with the third embodiment of the present invention.

FIG. 11 is an exploded view of a detachable adjustable mouth mask in accordance with a fourth embodiment of the present invention.

FIG. 12 is a schematic sectional assembly view of the detachable adjustable mouth mask in accordance with the fourth embodiment of the present invention.

FIG. 13 is a perspective assembly view of the detachable adjustable mouth mask in accordance with the fourth embodiment of the present invention.

FIG. 14 is an exploded view of an alternate form of the detachable adjustable mouth mask in accordance with the fourth embodiment of the present invention.

FIG. 15 is an exploded view of a detachable adjustable mouth mask in accordance with a fifth embodiment of the present invention.

FIG. 16 is a perspective assembly view of the detachable adjustable mouth mask in accordance with the fifth embodiment of the present invention.

FIG. 17 is an enlarged view of a part of FIG. 16, illustrating the structure of the receptacle of the chin support.

FIG. 18 is an exploded view of a detachable adjustable mouth mask in accordance with a sixth embodiment of the present invention.

FIG. 18-1 is an exploded view of a detachable adjustable mouth mask in accordance with a seventh embodiment of the present invention.

FIG. 19 is a perspective assembly view of the detachable adjustable mouth mask in accordance with the sixth embodiment of the present invention.

FIG. 20 is an exploded view of a detachable adjustable mouth mask in accordance with an eighth embodiment of the present invention.

FIG. 21 corresponds to FIG. 20, illustrating the shade fastened to the base frame member.

FIG. 22 is an enlarged view of a part of FIG. 20, illustrating the relationship between the coupling hole of the shade and the respective lug of the base frame member.

FIG. 23 is a schematic sectional view of a part of the eight embodiment of the present invention, illustrating the coupling holes of the shade coupled to the necks of the lugs of the base frame member.

FIG. 24 is an exploded view of a detachable adjustable mouth mask in accordance with a ninth embodiment of the present invention.

FIG. 25 is a perspective assembly view of the detachable adjustable mouth mask in accordance with the ninth embodiment of the present invention.

FIG. 26 is an enlarged view of a part of FIG. 24, illustrating the relationship between the coupling hole of the shade and the respective round head stud of the base frame member.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1, 2 and 3, a detachable adjustable mouth mask in accordance with a first embodiment of the present invention is shown comprising a base frame member 2, a chin support connector 1, a shade 4, a chin support 3, and a pair of ear loops 35.
The base frame member 2 is smoothly arched to fit the curvature of a human face, comprising a thin wall portion 22 on the middle. The shade 4 has the bottom side thereof fastened to the base frame member 2, forming with the base frame member 2 a curved surface. The chin support connector 1 is detachably fastened to the thin wall portion 22 of the base frame member 2 to hold the chin support 3, allowing replacement of the shade 4. The chin support connector 1 comprises a clamping groove 12 detachably fastened to the thin wall portion 22, a plurality of friction ribs 121 disposed in the clamping groove 12 to enhance friction between the inside wall of the chin support connector 1 and the thin wall portion 22 of the base frame member 2, and a pair of lugs 11 protruded from an inner wall thereof. Each lug 11 comprises a pivot hole 111 and a plurality of teeth 112 radially disposed at one side thereof around the pivot hole 111.
The chin support 3 comprises a pair of connection members 31 respectively disposed at the two distal ends of the top side thereof and respectively pivotally connected to the lugs 11 of the chin support connector 1. Each connection member 31 comprises a pivot pin 311 pivotally connected to the pivot hole 111 of one respective lug 11 of the chin support connector 1, and a plurality of teeth 312 radially disposed at one side thereof around the pivot pin 311 and engaged with the teeth 112 of the respective lug 11 of the chin support connector 1. The chin support 3 further comprises a spacer block 33 located on the inner side thereof for direct contact with the user's chin to keep the shade 4 away from the user's mouth and nose at a distance. Subject to the connection between the pivot pins 311 of the connection members 31 of the chin support 3 and the pivot holes 111 of the lugs 11 of the chin support connector 1, the chin support 3 can be biased forwards or backwards relative to the base frame member 2 to the desired tilting angle. The chin support 3 further comprises two extension arms 34 symmetrically extended from two opposite lateral sides thereof. Further, the ear loops 35 are respectively connected to the distal ends of the extension arms 34 of the chin support 3 for hanging on the user's ears. Further, subject to the engagement structure between the teeth 112 of the lugs 11 of the chin support connector 1 and the teeth 312 of the connection members 31 of the chin support 3, the chin support 3 can be quickly secured in position after angular adjustment relative to the base frame member 2. Further, a ventilation passage 331 is defined between the spacer block 33 of the chin support 3 and the base frame member 2 for exhaust of exhaled air downwardly and rapidly. Further, the shade 4 has a top notch 41 for ventilation, avoiding accumulation of breathing hot air inside the shade 4 and enhancing wearing comfort.
FIGS. 4 and 5 illustrate a detachable adjustable mouth mask in accordance with a second embodiment of the present invention. This second embodiment is substantially similar to the aforesaid first embodiment with the exception that the chin support connector is formed integral with a part of the base frame member, i.e., the base frame member 2 comprises two lugs 21 located on an inner side of a middle part thereof and kept apart at a distance. Each lug 21 comprises a pivot hole 211 to pivotally coupled to the pivot pin 311 of one respective connection member 31 of the chin support 3, and a plurality of teeth 212 radially disposed at one side thereof around the pivot hole 211 for engagement with the teeth 312 of one respective connection member 31 of the chin support 3.
FIGS. 6-9 illustrate a detachable adjustable mouth mask in accordance with a third embodiment of the present invention. According to this third embodiment, the detachable adjustable mouth mask comprises a base frame member 2, a chin support connector 1, a shade 4, a chin support 3, and a pair of ear loops 35.
The base frame member 2 is smoothly arched to fit the curvature of a human face, comprising a thin wall portion 22 on the middle. The shade 4 has the bottom side thereof fastened to the base frame member 2, forming with the base frame member 2 a curved surface. The chin support connector 1 is detachably fastened to the thin wall portion 22 of the base frame member 2 to hold the chin support 3, allowing replacement of the shade 4. The chin support connector 1 comprises a clamping groove 12 detachably fastened to the thin wall portion 22, a plurality of friction ribs 121 disposed in the clamping groove 12 to enhance friction between the inside wall of the chin support connector 1 and the thin wall portion 22 of the base frame member 2, and two round head studs 13 protruded from an inner wall thereof. Each round head stud 13 has a round head stud 131.
The chin support 3 comprises a pair of connection members 32 respectively disposed at the two distal ends of the top side thereof and respectively pivotally connected to the round head studs 13 of the chin support connector 1. Each connection member 32 comprises a ball socket 322 coupled to one respective round head stud 13 of the chin support connector 1, and a plurality of slits 321 cut through the peripheral wall of the ball socket 322 to enhance the elasticity of the ball socket 322. The chin support 3 further comprises a spacer block 33 located on the inner side thereof for direct contact with the user's chin to keep the shade 4 away from the user's mouth and nose at a distance, and two extension arms 34 symmetrically extended from two opposite lateral sides thereof. Further, the ear loops 35 are respectively connected to the distal ends of the extension arms 34 of the chin support 3 for hanging on the user's ears. Subject to the connection structure between the ball sockets 322 of the connection members 32 of the chin support 3 and the round head studs 13 of the chin support connector 1 and the design of the slits 321 of the ball sockets 322 of the connection members 32 of the chin support 3, the chin support 3 can be biased relative to the base frame member 2 to the desired tilting angle. Further, a ventilation passage 331 is defined between the spacer block 33 of the chin support 3 and the base frame member 2 for exhaust of exhaled air downwardly and rapidly. Further, the shade 4 has a top notch 41 for ventilation, avoiding accumulation of breathing hot air inside the shade 4 and enhancing wearing comfort. Further, as an alternate form of this third embodiment, the chin support connector 1 can be configured to provide only one single round head stud 13 on the middle, and the chin support 3 can be configured to provide only one single connection member 32 for connection with the single round head stud 13 of the chin support connector 1, as shown in FIG. 10.
FIGS. 11, 12 and 13 illustrate a detachable adjustable mouth mask in accordance with a fourth embodiment of the present invention. This fourth embodiment is substantially similar to the aforesaid third embodiment with the exception that the chin support connector is formed integral with a part of the base frame member, i.e., the base frame member 2 of the detachable adjustable mouth mask in accordance with this fourth embodiment comprises two round head studs 13 located on an inner side of a middle part thereof and kept apart at a distance and respectively detachably connected to the ball sockets 322 of the connection members 32 of the chin support 3. Subject to the connection structure between the ball sockets 322 of the connection members 32 of the chin support 3 and the round head studs 13 of the base frame member 2 and the design of the slits 321 of the ball sockets 322 of the connection members 32 of the chin support 3, the chin support 3 can be biased relative to the base frame member 2 to the desired tilting angle. Further, as an alternate form of this fourth embodiment, the base frame member 2 can be configured to provide only one single round head stud 13 on the middle, and the chin support 3 can be configured to provide only one single connection member 32 for connection with the single round head stud 13 of the base frame member 2, as shown in FIG. 14.
FIGS. 15 and 16 illustrate a detachable adjustable mouth mask in accordance with a fifth embodiment of the present invention. According to this fifth embodiment, the detachable adjustable mouth mask comprises a base frame member 5, a shade 6, a chin support 7, and a pair of ear loops 53. The base frame member 5 is smoothly arched to fit the curvature of a human face, comprising two plug rods 51 extended from the inner wall of the middle part thereof and kept apart at a predetermined distance and two clamping plates 52 respectively extended from the inner wall near the two distal ends thereof. Each clamping plate 52 defines with the inner wall of the base frame member 5 a clamping groove 521. Further, each clamping plate 52 comprises a plurality of friction ribs 522 disposed in the clamping groove 521. The chin support 7 comprises two receptacles 71 corresponding to the plug rods 51 of the base frame member 5. Each receptacle 71 comprises a plug hole 72 for receiving one respective plug rod 51 of the base frame member 5, and a plurality of friction ribs 721 disposed in the plug hole 72 to enhance friction between the inserted plug rod 51 and the respective receptacle 71 (see FIG. 17). The shade 6 comprises two through holes 61 disposed adjacent to the bottom side 621 thereof and respectively coupled to the two plug rods 51 of the base frame member 5, and two opposing end protrusions 62 respectively engaged into the clamping grooves 521 of the clamping plates 52 of the base frame member 5 and kept in friction engagement with the friction ribs 522. After the base frame member 5 and the shade 6 are assembled, the plug rods 51 of the base frame member 5 are press-fitted into the plug holes 72 of the receptacles 71 of the chin support 7 in friction engagement with the friction ribs 721. Thus, the base frame member 5, the shade 6 and the chin support 7 can be conveniently and detachably assembled, allowing replacement of the shade 6. Further, the ear loops 53 are respectively connected to the distal ends of the base frame member 5 for hanging on the user's ears. The chin support 7 further comprises a spacer block 73 located on the inner side thereof for direct contact with the user's chin to keep the shade 6 away from the user's mouth and nose at a distance.
FIGS. 18 and 19 illustrate a detachable adjustable mouth mask in accordance with a sixth embodiment of the present invention. This sixth embodiment is substantially similar to the aforesaid fifth embodiment with the exception that two notches 611 are made on the bottom side 621 of the shade 6 instead of the aforesaid through holes 61; the base frame member 5 further comprises an extra clamping plate 54 extended from the inner wall on the middle between the two plug rods 51 for clamping the middle part of the bottom side 621 of the shade 6. This extra clamping plate 54 defines with the inner wall of the base frame member 5 a clamping groove 541. Further, this extra clamping plate 54 comprises a plurality of friction ribs 542 disposed in the clamping groove 541.
FIG. 18-1 illustrates a detachable adjustable mouth mask in accordance with a seventh embodiment of the present invention. This seventh embodiment is substantially similar to the aforesaid sixth embodiment with the exception that the base frame member 5 eliminates the aforesaid clamping plates 52;54. During installation of this seventh embodiment, the notches 611 of the shade 6 are respectively attached to the plug, rods 51 of the base frame member 5, and then the shade 6 is bonded to the inner wall of the base frame member 5 using an adhesive or high-frequency sealing technology, and then the plug rods 51 of the base frame member 5 are respectively detachably press-fitted into the receptacles 71 of the chin support 7.
FIGS. 20-23 illustrate a detachable adjustable mouth mask in accordance with an eighth embodiment of the present invention. According to this eighth embodiment, the detachable adjustable mouth mask comprises a base frame member 8, a shade 6, a chin support 9, and a pair of ear loops 95. The base frame member 8 is smoothly arched to fit the curvature of a human face, comprising two clamping plates 82 inwardly extended from two distal ends thereof, one supplementary clamping plate 84 extended from the inner wall thereof on the middle, and two lugs 81 extended from the inner wall at two opposite lateral sides relative to the supplementary clamping plate 84. The clamping plates 82;84 each comprises a clamping groove 821;841, and a plurality of friction ribs 822;842 disposed in the clamping groove 821;841. Each lug 81 comprises a pivot hole 811, a plurality of teeth 812 radially disposed at one side thereof around the pivot hole 811, a neck 813 connected to the inner wall of the base frame member 8, and a collar 814 extending around the periphery of the neck 813. The distance between the collar 814 of the lug 81 and the inner wall of the base frame member 8 is equal to the wall thickness of the shade 6. The shade 6 comprises two end protrusions 62 extended from the two distal ends of the bottom side 621 thereof, and two coupling holes 612 located on the bottom side 621 corresponding to the lugs 81 of the base frame member 8. Each coupling hole 612 defines a narrow bottom entrance 613. The chin support 9 comprises two connection members 91, two extension arms 94 respectively extended from two opposite sides thereof, and a spacer block 93 located on the inner side thereof for direct contact with the user's chin to keep the shade 6 away from the user's mouth and nose at a distance. Each connection member 91 comprises a pivot pin 911, and a plurality of teeth 912 radially disposed at one side thereof around the pivot pin 911. By means of the narrow bottom entrance 613 of each coupling hole 612, the shade 6 is inserted into the clamping grooves 821;841 of the clamping plates 82;84 and the gap between the collar 814 of each lug 81 and the inner wall of the base frame member 8 and secured to the base frame member 8. The narrow bottom entrance 613 of each coupling hole 612 of the shade 6 can be expanded for allowing the neck 813 of the respective lug 81 of the base frame member 8 to be engaged into the respective coupling hole 612. After insertion of the respective lug 81 of the base frame member 8 into the respective coupling hole 612, the narrow bottom entrance 613 immediately returns to its former shape subject to the elastic material property of the shade 6. By means of inserting the pivot pins 911 of the connection members 91 into the pivot holes 811 of the lugs 81, the chin support 9 is coupled to the base frame member 8, and can be adjusted to the desired tilting angle and then secured in the adjusted position by engagement between the teeth 812;912.
Referring to FIGS. 24-26 illustrate detachable adjustable mouth mask in accordance with a ninth embodiment of the present invention. This ninth embodiment is substantially similar to the aforesaid eighth embodiment shown in FIGS. 20-23 with the exception that two round head studs 83 are provided at the base frame member 8 to substitute for the aforesaid lugs 81 protruded from an inner wall thereof, each round head stud 83 having a neck 813 connected to the inner wall of the base frame member 8 and a collar 814 extending around the periphery of the neck 813; the connection members 92 of the chin support 9 each comprise a ball socket 922 coupled to one respective round head stud 83 of the base frame member 8, and a plurality of slits 921 cut through the peripheral wall of the ball socket 922 to enhance the elasticity of the ball socket 922.
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.

Claims

What the invention claimed is:

1. A detachable adjustable mouth mask, comprising a base frame member, a shade, a chin support, a chin support connector, and a pair of ear loops, wherein said base frame member is configured to fit the curvature of a human face; said shade comprises a bottom side fastened to said base frame member such that said shade defines with said base frame member a curved surface; said chin support connector is detachably fastened to a middle part of said base frame member, comprising a clamping groove for securing said base frame member, a plurality of friction ribs disposed in said clamping groove for friction engagement. with said base frame member, and at least one connection member; said chin support comprises at least one connection member respectively and angularly adjustably connected to the at least one connection member of said chin support connector, and two extension arms respectively extended from two opposite lateral sides thereof; said ear loops are respectively connected to said extension arms of said chin support for hanging on the ears of a person.

2. The detachable adjustable mouth mask as claimed in claim 1, wherein each connection member of said chin support connector comprises a lug, and a pivot hole located on said lug; each connection member of said chin support comprises a pivot pin pivotally coupled to the pivot hole of one respective connection member of said chin support connector.

3. The detachable adjustable mouth mask as claimed in claim 1, wherein each connection member of said chin support connector comprises a round head stud having a round head; each connection member of said chin support comprises a ball socket pivotally coupled to the round head of the round head stud of one respective connection member of said chin support connector, and a plurality of slits located on said ball socket.

4. The detachable adjustable mouth mask as claimed in claim 1, wherein said base frame member comprises a thin wall portion located on a middle part thereof and inserted into said clamping groove of said chin support connector in friction engagement with said friction ribs.

5. The detachable adjustable mouth mask as claimed in claim 1, wherein said chin support comprises a spacer block located on an inner side thereof for direct contact with the user's chin to keep said shade away from the user's mouth and nose at a distance, said spacer block defining with said chin support connector and said base frame member a ventilation passage for exhaust of exhaled air.

6. The detachable adjustable mouth mask as claimed in claim 1, wherein said chin support comprises a spacer block located on an inner side thereof for direct contact with the user's chin to keep said shade away from the user's mouth and nose at a distance, said spacer block defining with said chin support connector and said base frame member a ventilation passage for exhaust of exhaled air.

7. The detachable adjustable mouth mask as claimed in claim 2, wherein each connection member of said chin support connector further comprises a plurality of teeth radially located on one side of the lug thereof around the associating pivot hole; each connection member of said chin support further comprises a plurality of teeth radially located on one side around the pivot pin thereof for engagement with the teeth of the respective connection member of said chin support connector in a detachable manner.

8. A detachable adjustable mouth mask, comprising a base frame member, a shade, a chin support, and a pair of ear loops wherein said base frame member is configured to fit the curvature of a human face, comprising a plurality of lugs extended from an inner side thereof and a pivot hole located on each said lug; said shade comprises a bottom side fastened to said base frame member such that said shade defines with said base frame member a curved surface; said chin support comprises a plurality of connection members, each said connection member comprising a pivot pin pivotally coupled to the pivot hole on one lug or said base frame member, and two extension arms respectively extended from two opposite lateral sides thereof; said ear loops are respectively connected to said extension arms of said chin support for hanging on the ears of a person.

9. The detachable adjustable mouth mask as claimed in claim 8, wherein each said lug of said base frame member comprises a plurality of teeth radially located on one side thereof around the associating pivot hole; each connection member of said chin support further comprises a plurality of teeth radially located on one side around the pivot pin thereof for engagement with the teeth of the respective lug of said base frame member in a detachable manner.

10. The detachable adjustable mouth mask as claimed in claim 8, wherein said chin support comprises a spacer block located on an inner side thereof for direct contact with the user's chin to keep said shade away from the user's mouth and nose at a distance, said spacer block defining with said base frame member a ventilation passage for exhaust of exhaled air.

11. A detachable adjustable mouth mask, comprising a base frame member, a shade, a chin support, and a pair of ear loops, wherein said base frame member is configured to fit the curvature of a human face, comprising two clamping plates extended from two distal ends of an inner side thereof and a plurality of plug rods extended from the inner side and spaced between said two clamping plates, each said clamping plate comprising a clamping groove and a plurality of friction ribs disposed in said clamping groove; said shade comprises two end protrusions respectively extended from two distal ends of a bottom side thereof and respectively inserted into the clamping grooves of said clamping plates of said base frame member in friction engagement with the friction ribs in said clamping grooves; said chin support comprises a plurality of connection members, each said connection member comprising a plug hole coupled to one respective plug rod of said base frame member, a plurality of friction ribs disposed in said plug hole for friction engagement with the inserted plug rod of said base frame member, and two extension arms respectively extended from two opposite lateral sides thereof; said ear loops are respectively connected to said extension arms of said chin support for hanging on the ears of a person.

12. The detachable adjustable mouth mask as claimed in claim 11, wherein said shade comprises a plurality of through holes disposed near the bottom side thereof and respectively coupled to the plug rods of said base frame member.

13. The detachable adjustable mouth mask as claimed in claim 11, wherein said shade comprises a plurality of bottom notches located on the bottom side thereof and respectively attached to the plug rods of said base frame member.

14. The detachable adjustable mouth mask as claimed in claim 11, wherein said shade is selectively bonded to said base frame member using an adhesive or high-frequency sealing technology.

15. The detachable adjustable mouth mask as claimed in claim 11, wherein said base frame member further comprises a supplementary clamping plate extended from the inner side thereof on the middle, said supplementary clamping plate comprising a clamping groove for receiving the bottom side of said shade and a plurality of friction ribs disposed in the clamping groove for friction engagement with the inserted bottom side of said shade.

16. A detachable adjustable mouth mask, comprising a base frame member configured to fit the curvature of a human face, a shade, a chin support and a pair of ear loops, said base frame member comprising a plurality of lugs extended from an inner side thereof, said chin support comprising a plurality of connection members respectively pivotally coupled to the lugs of said base frame member, said ear loops being respectively connected to said chin support for hanging on the ears of a person, wherein said base frame comprises two clamping plates respectively from two distal ends of an inner side thereof, each said clamping plate comprising a clamping groove and a plurality of friction ribs disposed in said clamping groove, said shade comprises a plurality of coupling holes located on a bottom side thereof and respectively coupled to the lugs of said base frame member and two end protrusions respectively extended from two distal ends of the bottom side and respectively inserted into the clamping grooves of said clamping plates of said base frame member in friction engagement with the friction ribs in said clamping grooves, each said coupling hole comprising a narrow bottom entrance elastically expandable for allowing the respective lug of said base frame member to be engaged into the respective said coupling hole.

17. The detachable adjustable mouth mask as claimed in claim 16, wherein each said connection member of said chin support comprises a pivot pin pivotally coupled to one respective said lug of said base frame member; each said lug of said base frame member comprises a pivot hole pivotally coupled to the pivot pin of the respective connection member of said chin support, a neck connected to the inner side of said base frame member, and a collar extending around the periphery of the neck thereof for supporting the bottom side of said shade on the inner side of said base frame member, the distance between said collar and the inner side of said base frame member being equal to the thickness of the bottom side of said shade.

18. The detachable adjustable mouth mask as claimed in claim 16, wherein said chin support comprises two extension arms respectively extended from two opposite lateral sides thereof; said ear loops are respectively connected to said two extension arms of said chin support.

19. The detachable adjustable mouth mask as claimed in claim 17, wherein each said lug of said base frame member further comprises a plurality of teeth radially disposed at one side around the pivot hole thereof; each said connection member of said chin support comprises a plurality of teeth radially disposed at one side around the pivot pin thereof for engagement with the teeth of the respective lug of said base frame member.

20. The detachable adjustable mouth mask as claimed in claim 17, wherein said base frame member further comprises a supplementary clamping plate extended from the inner side thereof on the middle between said lugs said supplementary clamping plate comprising a clamping groove for receiving the bottom side of said shade and a plurality of friction ribs disposed in the clamping groove for friction engagement with the inserted bottom side of said shade.

21. The detachable adjustable mouth mask as claimed in claim 17, wherein each said lug of said base frame member is made in the form of a round head stud, said round head stud comprising a round head and a neck connected between said round head and the inner side of said base frame member; said chin support comprises a plurality of connection members and two extension arms respectively extended from two opposite lateral sides thereof, each said connection member comprising a ball socket pivotally coupled to the round head of one respective round head stud of said base frame member to stop the bottom side of said shade against the inner side of said base frame member and a plurality of slits located on said ball socket; said two ear loops are respectively connected to said extension arms of said chin support for hanging on the ears of a person.