BACKGROUND OF THE INVENTION
Field of the Invention
[0001] This invention relates generally to face masks, and is more particularly concerned
with an improved face mask for a self contained breathing apparatus.
Discussion of the Prior Art
[0002] A face mask for a self contained breathing apparatus (SCBA) generally includes about
six straps fixed to the face mask and to the head harness. The straps, typically,
are elastic, and pass through roller buckles to allow easy tightening of the straps.
The technique is to tighten each of the six straps to pull the mask's seal tightly
against the face to effect a good seal. Since the straps are elastic, however, they
tend to pull a person's hair during tightening. Further, the six straps and buckles
are arranged so the person must pull on the straps in a direction towards his back
to tighten the straps. This is an awkward task, and renders tightening of the mask
slow and difficult. It is well known also that rubber tends to deteriorate from exposure
to the ambient atmosphere, which may include chorine, ozone and other damaging chemicals.
As a result, the straps may break at any time, without prior warning. If even one
strap breaks, it will be understood that the seal between the mask and the person's
face may be compromised since all six straps are tightened to effect the seal.
[0003] Another problem with the prior art face masks is the requirement for three different
sizes of mask. Much of the reason for the different sizes is in the nose cup, since
adults do not vary widely in the upper portion of the face; thus, the variation is
from the bridge of the nose to the chin. Nevertheless, in order to fit everyone, manufacturers
have made three different sizes of nose cups to fit the small, medium and large faces.
Each of these sizes requires a different mold, which is quite expensive, though about
90% of the sales are of the medium size.
[0004] A great number of people have some refractive error in their normal eyesight, requiring
correction with glasses. For people using face masks, the use of corrective lenses
has been expensive and troublesome. One technique is to have the corrective lenses
ground into the face mask itself. This is usually very expensive, and does not allow
the sharing of masks. Another technique is to attach spectacles to nibs fixed to the
mask, the nibs being adapted to receive the spectacle frames at the usual hinge point
for the temple pieces. This arrangement causes difficulty in affixing the spectacles
properly, and is time consuming. Another technique is to fix the spectacles to a bracket
or the like that is fixed to the face plate. Again, there is some difficulty in obtaining
proper alignment.
[0005] The seal around the face mask is a source of some problems. For a firefighter or
the like who wears a helmet while wearing a face mask, the seal of the face mask tends
to interfere with the helmet, rendering the helmet uncomfortable. Also, many people's
heads are slightly smaller at the temples, which militates against a secure seal at
the temples.
[0006] Thus, the prior art has not provided a face mask for a self contained breathing apparatus
that is easily adaptable to a variety of different people with different physiognomies.
SUMMARY OF THE INVENTION
[0007] The present invention provides a face mask for a self contained breathing apparatus,
the face mask including a head harness attached to the mask by a plurality of straps,
all such straps being fixed to a headpiece of net or cloth form. Two of the straps
are easily adjustable, and act on the headpiece to pull the seal of the face mask
snugly against the face.
[0008] The nose cup in the face mask of the present invention is made in a medium size,
and is altered to fit small and large people. For fitting small people, the lower
area of the nose cup is cut out and fixed together to make the nose cup smaller; and,
for fitting large people the lower portion of the nose cup is simply cut away to give
some freedom. The face mask seal is maintained by the seal around the mask.
[0009] For people who need visual correction, the mask of the present invention defines
a receptacle on the nose cup, the receptacle being designed to receive a mounting
member. The mounting member then receives a sliding block that carries a pair of spectacles.
Thus, any person can place his own mounting member, with spectacles attached, into
the receptacle. The mounting member is movable with respect to the receptacle to allow
adjustment towards and away from the person's face, and the sliding block allows movement
up and down for proper alignment of the lenses with the eyes.
[0010] The seal of the mask of the present invention deviates slightly inwardly at the temples
of the wearer so there will be a secure seal even with somewhat unusual physiognomy.
Also, the seal at the forehead is reduced to a single thickness to reduce interference
with helmets or the like.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] These and other features and advantages of the present invention will become apparent
from consideration of the following specification when taken in conjunction with the
accompanying drawings in which:
Fig. 1 is a perspective view showing a face mask made in accordance with the present
invention;
Fig. 2 is a schematic representation of the mask shown in Fig. 1, illustrating the
rear elevational view;
Fig. 3 is a perspective view of a nose cup for use in the mask of the present invention,
and showing the nose cup modified for a small size;
Fig. 4 is a view similar to Fig. 3, but showing the nose cup modified to be a large
size;
Fig. 5 is a fragmentary detail showing a side elevational view of the mounting for
corrective lenses;
Fig. 6 is a front elevational view showing the arrangement pictured in Fig. 5;
Fig. 7 is a vertical cross-sectional view of a face mask showing the seal; and,
Fig. 8 is rear elevational view of the mask of Fig. 7.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0012] Referring now more particularly to the drawings, and to those embodiments of the
invention here presented by way of illustration, Fig. 1 shows a face mask 10 having
a transparent face plate 11, an inner, frill face seal 12 surrounding the face plate
11 and fixed to the frame 13, and a nose cup 14. Those skilled in the art will understand
that the conventional face mask has about six points for attachment of straps to the
frame 13, and a person must adjust each of the six straps to achieve uniform pressure,
and good sealing between the person's face and the seal, such as the seal 12. In the
mask of the present invention, however, there are only four points of attachment to
the mask, and only two straps to adjust for a proper seal.
[0013] Looking at Fig. 2 in conjunction with Fig. 1, it will be seen that there are four
connecting points designated at 15, 16, 18 and 19. Straps 20 and 21 are connected
to connecting points 15 and 16, and are also connected to a head piece 22. The straps
20 and 21 are preferably non-stretchable, and are permanently fixed to the head piece
22 and the frame 13 without buckles or the like for adjustment of the straps.
[0014] The head piece 22 is here illustrated as of a net form, but it should be understood
that a woven fabric or the like can be used equally well. The head piece 22 should
be made of a material that is not stretchable, but is preferably dimensionally unstable.
For example, one preferred material is a net made of "Kevlar" (a polyaramid fiber)
or other strong, non-elastic fiber. Numerous materials will suggest themselves to
those skilled in the art.
[0015] Considering the mask as depicted in Fig. 1, it will be understood that the top of
the mask 10 has the straps 20 and 21 fixed to the head piece 22. The bottom of the
mask is held by straps 24 and 25 connected to connecting points 18 and 19 respectively.
The straps 24 and 25 are engaged with buckles 26 and 28, the buckles 26 and 28 being
fixed to an apron 29 on the head piece 22. It should therefore be understood that
the buckles 26 and 28 are fixed with respect to the apron 29, and the straps 24 and
25 can be lengthened or shortened by appropriate manipulation of the buckles 26 and
28.
[0016] With the above and foregoing description in mind, the use of the device of Figs.
1 and 2 should be understandable. One will first lengthen the straps 24 and 25 sufficiently
to allow the straps 24 and 25 to pass on each side of the person's head, and to put
the mask 10 in place on the face. When the mask 10 is properly positioned on the face,
the head piece 22 will extend over the person's head, and somewhat down the back of
the head. Next, the strap ends 30 and 31 are pulled. The buckles 26 and 28 will be
conventional roller buckles so that pulling on the strap ends 30 and 31 will shorten
the straps 24 and 25, and lifting the ends of the buckles will release the buckles
and allow lengthening of the straps.
[0017] In the apparatus of the present invention, the head piece 22 extends generally over
the head, so the strap ends 30 and 31 are positioned around the base of the skull,
and are oriented so that the pulling force is in a generally forward and downward
direction. Thus, the pulling is an easy, natural motion. When the two straps are shortened,
the entire head piece 22 is tightened. The head piece is non-stretchable, but is dimensionally
unstable, so the head piece conforms to the shape of the head, and the face mask 10
is pulled snugly against the face.
[0018] Those skilled in the art will understand that, for a mask such as the face mask 10
to fit properly, the nose cup 14 must fit properly. The nose cup 14 must fit over
the bridge of the nose, and contain the mouth and chin. Because of this, face masks
are generally made in three sizes, requiring three different molds for molding the
three different nose cups. The present invention, however, provides a method for fitting
all sizes with a single molded nose cup
[0019] It should first be understood that the upper portion of adult faces are rather consistent,
and it is the lower portion of the face that varies significantly. Furthermore, it
has been found that a medium size nose cup will fit about 90% of the adult population,
so the expense of making two additional molds is to fit only 10% of the population.
[0020] The present invention comprises the making of only one size nose cup 14, and altering
the nose cup to fit either a small or a large adult. Fig. 3 illustrates a nose cup
14a adjusted to fit a small person. The lower portion 32 that is designed to receive
the person's chin has been cut and fixed together, as by staples 34. More specifically,
a V-shaped piece will be removed from the portion 32, and the edges brought together
and fastened. It will be understood that this shortens the nose cup from top to bottom.
The cut edges can be fixed together by staples 34 as shown, or can be stitched, glued,
or otherwise fastened.
[0021] Fig. 4 illustrates a nose cup 14b that has been altered to fit a large person. In
this nose cup, it will be noticed that an area of the lower portion 32 has been cut
away at 35. Since the lower part of the face is longer than average, simply removing
enough of the nose cup 14b to allow room for the person's chin well adapts the mask.
It will be understood that the nose cup 14b is within the seal 12, so the removed
portion of the nose cup 14b causes no problem in use of the face mask 10.
[0022] Attention is next directed to Figs. 5 and 6 of the drawings which show eyeglasses
for use in a mask 10, and mounting means for the eyeglasses. It will be seen that
the eyeglasses themselves comprise two lenses 40 and 41 mounted in frames 42 and 44,
the frames 42 and 44 being connected together by a bridge 45.
[0023] A pair of support arms 46 is fixed to the bridge 45, and extend forward and down
where they receive a block 48.
[0024] It will be easily recognized that eye glasses must be mounted close to the nose cup
14 because the bridge of the person's nose will be at the top of the nose cup, and
the eyes must be adjacent. In the present invention, two ribs 49 and 50 are placed
on the nose cup on each side of the apex of the nose cup. Each of the ribs 49 and
50 defines a hole longitudinally therein for receiving a mounting member 51. The mounting
member 51 is here shown as formed of wire or the like and including a pair of legs
52, each leg being received by one of the ribs 49 and 50. The upper portion of the
mounting member is bent upwardly as shown at 54, and passes though the block 48.
[0025] It will be therefore be understood that the mounting member 51 can slide into and
out of the ribs 49 and 50 to move the upward portion 54 back and forth to be nearer
to or farther from the eyes of the person wearing the mask 10. The holes in the ribs
49 and 50 are sized to grip the mounting member 41 sufficiently that the member will
remain in the chosen position.
[0026] The block 48 is preferably formed of an elastomeric material, and the holes that
receive the mounting member 41 are also small, so the block 48 will grip the mounting
member 14. Thus, the block 48 can be raised or lowered on the mounting member 51 to
place the lenses 40 and 41 properly with respect to the eyes of the person wearing
the mask 10. Considering the notions of both the eyeglasses on the mounting member
51, and the mounting member 51 on the nose cup 14, it will be understood that the
eyeglasses can be adjusted vertically so the eyes will be at the axes of the lenses,
and horizontally to place the lenses the proper distance from the eyes.
[0027] Looking next at Fig. 7 of the drawings, the mask is again designated at 10 and the
face seal at 12. Fig. 7 shows the mask in cross-section so the construction of the
seal can be seen. It will be noticed that the material of the seal 12 extends from
the face contacting portion to the rigid frame 55 of the mask 10. The usual construction
is shown at the lower end of the mask 10 adjacent to the chin receiving area 56, and
it will be noticed that there is a double thickness of rubber or other material at
58 to engage the face of the wearer. At the top of the seal 12, the portion 59 is
adapted to engage the forehead of the wearer and seal thereagainst. In the conventional
mask, this area too has a double thickness, being formed the same as the lower portion
of the seal. In the mask of the present invention, however, the area 59 is a single
thickness, and an integrally formed flange 60 extends to the rigid frame 55.
[0028] Thus, for firefighters and the like who wear a helmet while wearing a face mask,
the portion 59 of the seal for the mask is thin enough to reduce the bulkiness of
the seal, and the consequent discomfort of the helmet.
[0029] With attention now to Fig. 8 of the drawings, the rear elevation of the mask 10 is
shown. The mask 10 is substantially the same as that depicted in Figs. 1 and 2, so
the same reference numerals are used. Fig. 8, however, shows the novel face seal 12
discussed in connection with Fig. 7.
[0030] Remembering that the seal 12 includes a web that extends from the face-contacting
portion to the rigid frame 55, that web is shown somewhat in Fig. 8 and is designated
at 61. In the area of the temples of the wearer, such areas being designated at 62a
and 62b, the web 61 is lengthened somewhat to position the temple portions 62 inwardly
of the usual curve of the seal 12. Since the seal 12 is made of rubber or other elastomeric
material there is sufficient resilience to fit a person who does not sink in at the
temples; but, for those whose heads are smaller at the temples, the closer temple
areas will assure a good seal.
[0031] It will therefore be seen that the present invention provides a face mask for a self-contained
breathing apparatus that is easy and comfortable to use, and that can be adapted for
use by any adult. The head harness is quick and simple to use, and is more comfortable
than the conventional head harness. The nose cup allows one size of the nose cup to
be adapted to any adult wearer; the seal adapts the mask to different physiognomies
and uses; and, the eyeglasses mount provides for easy insertion and removal of eyeglasses.
When the eyeglasses are installed, they can quickly be adjusted to fit the face of
the wearer, and they will be held in place as long as required.
[0032] It will of course be understood by those skilled in the art that the particular embodiments
of the invention here presented are by way of illustration only, and are meant to
be in no way restrictive; therefore, numerous changes and modifications may be made,
and the full use of equivalents resorted to, without departing from the spirit or
scope of the invention as outlined in the appended claims.
1. In a face mask for use with a self contained breathing apparatus, said face mask comprising
a frame (13) having a top and a bottom, a transparent face plate (11) within said
frame (13), a face seal (12) fixed to said frame (13) and surrounding said face plate
(11), a nose cup (14) within said face seal and towards said bottom of said frame,
and strap means (20, 21, 24, 25) for holding said face mask to the face of a user,
the improvement wherein said strap means (20, 21, 24, 25) comprises a head piece (22)
having a top end adjacent to said top end of said frame and a bottom end adjacent
to said bottom end of said frame, a first plurality of straps (20, 21) fixed to said
top end of said head piece (22) and to said top end of said frame, and a second plurality
of straps (24, 25) adjustably fixed to said bottom end of said head piece and fixed
to said bottom end of said frame, so that shortening said second plurality of straps
pulls said head piece and causes said face seal (12) to seal against the face of a
user.
2. In a face mask as claimed in claim 1, the further improvement wherein said head piece
(22) is non-stretchable and dimensionally unstable for conforming to the head of a
user.
3. In a face mask as claimed in claim 2, the improvement wherein said head piece is generally
rectangular, said first plurality of straps (20, 21) comprises a first pair of straps
fixed to the corners of said top end of said head piece (22) for fixedly holding said
head piece with respect to said frame.
4. In a face mask as claimed in claim 3, the further improvement wherein said second
plurality of straps (24, 25) comprises a second pair of straps, said second pair of
straps comprising a pair of buckles (26, 28) fixed to said bottom end of said head
piece, and a pair of strap portions fixed to said bottom end of said frame and adjustably
received by said buckles.
5. In a face mask as claimed in claim 1, the improvement comprising a pair of eyeglasses
within said face mask and supported adjacent to said nose piece (14), said eyeglasses
comprising a pair of frames (42, 44) including a pair of lenses (40, 41) in said frames,
a bridge (45) fixed to said frames for holding said frames with respect to each other,
a mounting member (51) carried by said nose cup, and support arms (46) fixed to said
bridge and adjustably fixed to said mounting member.
6. In a face mask as claimed in claim 5, the further improvement comprising at least
one rib (49, 50) on said nose cup (14), said rib defining a longitudinal hole therein,
said mounting member including at least one arm slidably receivable within said longitudinal
hole.
7. In a face mask as claimed in claim 6, the improvement comprising a block (48) carried
by said support arms (51), said block defining holes therethrough for slidably receiving
said mounting member.
8. In a face mask as claimed in claim 1, wherein said face seal includes a forehead portion
for contacting the forehead of the wearer, the improvement wherein said face seal
is of a single thickness at said forehead portion.
9. In a face mask as claimed in claim 1, wherein said face seal includes opposed temple
portions (62a, 62b), the improvement wherein said temple portions extend inwardly
of the rest of said seal.
10. The method of sizing a face mask to fit a variety of sizes of adults comprising the
steps of molding a nose cup (14) for a face mask of a medium size, said nose cup having
a top end for engaging the bridge of the nose of the user of the face mask and a bottom
end for receiving the chin of said user, said method further including the step of
adjusting said bottom end of said nose cup to fit said user.
11. The method as claimed in clam 10, wherein said step of adjusting said bottom end comprises
the step of removing a portion of said bottom end, and joining the edges for shortening
said nose cup.
12. The method as claimed in claim 10, wherein said step of adjusting said bottom end
comprises the step of cutting away a portion of said bottom end for allowing the chin
of the user to extend beyond said nose cup and remain within said face seal.
13. In a face mask for use with a self contained breathing apparatus, said face mask comprising
a frame (13) having a top and a bottom, a transparent face plate (11) within said
frame, a face seal (12) fixed to said frame and surrounding said face plate, a nose
cup (14) within said face seal (12) and towards said bottom of said frame, and strap
means (20, 21, 24, 25) for holding said face mask to the face of a user, the improvement
comprising a pair of eyeglasses within said face mask and supported adjacent to said
nose piece, said eyeglasses comprising a pair of frames (42, 44) including a pair
of lenses (40, 41) in said frames, a bridge (45) fixed to said frames for holding
said frames with respect to each other, a mounting member carried by said nose cup,
and support arms fixed to said bridge and adjustably fixed to said mounting member.
14. In a face mask as claimed in claim 13, the further improvement comprising at least
one rib (49, 50) on said nose cup, said rib defining a longitudinal hole therein,
said mounting member including at least one arm slidably receivable within said longitudinal
hole.
15. In a face mask as claimed in claim 14, the improvement comprising a block (48) carried
by said support arms, said block defining holes therethrough for slidably receiving
said mounting member.
16. In a face mask as claimed in claim 13, the improvement wherein said strap means comprises
a head piece (22) having a top end adjacent to said top end of said frame and a bottom
end adjacent to said bottom end of said frame, a first plurality of straps (20, 21)
fixed to said top end of said head piece and to said top end of said frame, and a
second plurality of straps (24, 25) adjustably fixed to said bottom end of said head
piece and fixed to said bottom end of said frame, so that shortening said second plurality
of straps pulls said head piece and causes said face seal to seal against the face
of a user.
17. In a face mask as claimed in claim 16, the further improvement wherein said head piece
(22) is non-stretchable and dimensionally unstable for conforming to the head of a
user.
18. In a face mask as claimed in claim 17, the improvement wherein said head piece (22)
is generally rectangular, said first plurality of straps comprises a first pair of
straps (20, 21) fixed to the corners of said top end of said head piece for fixedly
holding said head piece with respect to said frame.
19. In a face mask as claimed in claim 18, the further improvement wherein said second
plurality of straps comprises a second pair of straps (24, 25), said second pair of
straps comprising a pair of buckles (26, 28) fixed to said bottom end of said head
piece, and a pair of strap portions fixed to said bottom end of said frame and adjustably
received by said buckles.