US 2199231 A
Descripción (El texto procesado por OCR puede contener errores)
April 30, 1940. N. SCHWARTZ RESPIRATOR Filed May 13, 1939 2 Sheets-Sheet 1' April 5 4 I N. SCHWARYTZ v 2.199.231
RESPIRATOR Filed May 13, 1939 2 Sheets- Sheet 2 INVENTOR mew:-
Application May 13, 1939, Serial No. 273,4392 a 8 Claims.
This invention relates to filter type respirators applied to cover the nose and mouth of the wearer for the purpose of protection against dust fumes and gases and is a modification of my copending applications, Serial No. 122,169 of January 25, 1937, Serial No. 124,851 of February 9, 1937, Serial No. 116,456 of Dec. 18, 1936, (now Patent No. 2,160,317, dated May 30, 1939,) Serial No. 222,139 of July 30, 1938, and Serial No. 112,646
of Nov. 25, 1936. i
The object of this invention is to provide a light, comfortable and efficient respirator.
Another object is to provide a comfort air pad at the bridge of the nose.
1 Another object is to place the head band connection in a manner to automatically provide a leak proof and comfortable juncture between the face of the wearer and the face piece of the respirator.
Another object is to locate the exhalation valve conveniently and provide protection thereto.
Another object is to provide a large filter pad pleated and folded in a manner whereby it is easily manipulated and inserted in a casing which casing is adjacent to the face piece of the respirator.
With these and other objects in view reference is had to the following description and the accompanying drawings in which there is exhibited one example or embodiment of the invention, while the claims describe the actual scope of the same.
In the drawings: Figure 1 illustrates the respirator in section and in applied position.
Figure 2 is a top view showing head band connection to the casing, and the valve screen positioned between the casing and face piece.
. Figure 3 is a perspective of nose flange and the 0 two lateral slits.
Figure 4 is the same as 3 showing the inward fold of the central part of flange. Figure 5 is a section on line 5+5 of Figure 1, illustrating the valve and valve screen. 5 .Figure 6 is perspective of valve screen.
Figure 'ris perspective of the filter pad andthe corrugated filter spacer.
Figure 8 is the filter pad folded and-partly broken-to show the corrugated spacer.
Figure 9 is the same as Figure 8 with the apex' of thepad forming an additional lateral fold. Figure-10 is the same as 9 with the base of the pad opened and ready for insertion into casing."
"Figure 11 shows the casing partly broken with filter. pad emplaced.
Referring to ther=drawings by. .zcharactersa of reference, A designates:the :face.piece.:0fthe respirator, B the filter unit, C.-.the valve screen;-
D the valve, and E'the head bands.
The face piece A isra substantiallyhollowcup shaped molded semieflexiblemody, preferably of rubber material. It: has a vertical nose/coverin portion l0 and a set back'below the nose, line-l i.
The set back is formed by a horizontal nose.;cover-. ing portion l2, a mouth covering portion- 'lhand. a chin, covering portion il..-. A.flap valve Dis:
located at the mouth c'overing portion,- and the filter unit B is located and attached, at V-thechin covering portion, J
The face piece 'has anIinturned -flange; ii at" the nasal area which fiangei is slit in two-places;
at the sides of thebridge area. -A'-central.tongue i6 is thus formed swhich-.isrfolded: towardythe nose covering portion *ilixand attachem-thereto;
by means of cement.;*The .attachment=ofqthe tongue ii to the nose'covering' portion ions fore an air spacei l is" thereby-"i-formedmlt is Figure 12 is a perspective-of foraminouslid for,
madeat the edges of 'saidtongue l6. and them to be noted that the' tongue lfi has lateral'sides;
l8 and an aperture ii' i's-formedthereat toipermitrinlet and outlet of air to.-,and:from :the.-air space 11. It is apparent 'that therebyease and corm.
fort are provided for thebridge'ofthe 'nose. t-The' tongue-l6 is to be rather thin 'soas topermit a wide range of resilience to ac commodate any The slits are tober'nade in" such a manner that. thevcoine to"Withiii aboutone' the" outer ma gin; 2!; and;
shape of nose.
eighth of an inch thereby the ma formation?thereat'perinits a leak proof, juncture. Th ."flan es isgar juncture at the side of the nojse'. faring cheek] of the wearer theg niargin v lbf. thel'faceipiecegis preferablyarrange for.
noted that thelnasa .flangej 5, and ishes, and flattens-s n ;mergin g1;;w; ih-
part adjacent the; nose; and face juactur 40 stantially' thick toiprovide 'a'nnn i leaii mor;
comfort at the partsiandalso makesthelcontact joint of the face piece of. the respirator,.:a nd the face ofthe wearer at: the said part leak'proof; and therefore when the respirator is in applied position its contact at the nasal area is comfortable and leak proof.
The valve D is formed at the mouth covering portion l3. The mouth covering portion I3 is flat and has a plurality of perforations 2|. Two pins 22 are disposed at the upper lateral portions, one on either side. These pins 22 may be integral with the wall l3 or may be attached thereto by being inserted or' riveted thereat. A thin rubber flap 23 having holes 24, which holes register with the pins 22, is emplaced in covering relation to the wall |3 with the pins 22 being inserted in the holes 24. During exhalation the flap 23 is blown forward and thereby an opening is formed for easy escape of exhaled air. The valve D is protected from outer deleterious influences by a screen, the construction of which will be given later.
The filter unit B is preferably constructed of light metal such as aluminum. It has a. casing 25, which casing has a rear wall 26 and a peripheral rim 21 and an inturned flange 28. The rear wall 26 has an aperture 29. The intumed flange 28 has several slits 30 and in several places it protrudes outwardly to form tines 3| for the purpose of impinging the edges of the filter pad.
The filter pad 32 is preferably circular to fit into a similar shaped casing but may be oval or square to fit similar shaped casings. A corrugated and perforated spacer 33 is placed cen trally on the filter pad and a. median fold is made with the edges in coapting position. The median fold reduces the pad to 180 degrees. Another median fold is made reducing the pad to 90 degrees, as shown in Figure 8. The pad is now wedge shaped having a base 34 and an apex 35. The apex 35 is folded towards the base 34, as shown in Figure 9, and the base leaves are separated, three leaves on one side and one leaf on the opposite side thereby forming a circle as shown in Figure 10, and it thus ready to be inserted into casing.
Figure 11 shows the marginal portion of the casing 25 and the edges of the filter pad base 34 spread and adjusted at the outer side of the flange 28. The figure is illustrated in parts broken to show the corrugated spacer 33 and also the slits 30 and the tines 3|.
Figure 12 shows the foraminous lid member 36. This lid has a marginal flange 31 which is disposed at about right angles to its plane.
The edges of the filter pad are mounted at the outer portion of the intumed flange 28, and the lid 36 is emplaced at the inner side of the filter pad edges and thereby the said edges are secured to the said flange 28, The slits 30 permit a yield in the said flange 28, and the protrusions or tines 3| impinge at the said filter pad edges and firmly secure same at the joint formed thereat. It is to be noted that the edges of the flange 31 are directed inwardly. A central protrusion 38 is provided for the lid 36 which is for the purpose of thumb hold in order to permit easy replacement of said lid 36.
The valve screen C is preferably of light aluminum material and has a body portion 39 which is perforated to allow free outward passage of exhaled air. It has an anterior convexity to form an enclosure for the valve D. At its upper and central portion it has a hook extension 40.
The said book 40 is inserted in an aperture 4|.
The said aperture 4| is formed in a lug exten-- sion 42 at the lower part of the nose covering Ill.
The filter unit is attached to the face piece as follows: the rear wall 26 of the casing has an aperture 29. The chin covering wall l4 of the face piece has a similar aperture 43 and it is located in registering position with aperture 29. An eyelet 44 is inserted and passed through both apertures and both edges of the eyelet are everted to form outward extending flanges, which flanges impinge upon the walls 26 and I4 and thereby clamp them together, thereby a leak proof joint is formed thereat.
At the rear side of wall 26, two metal strips 45 are attached. These metal strips are positioned lateral to the eyelet juncture of the face piece and filter unit. These strips 45 each have a flange 46 at one end, which are for the purpose of attachment by means of rivets 41 to the casing rear wall 26. At the opposite ends the said strips have hook formations 48. The head bands E have metal slides 49 attached thereto at one extremity. These slides have holes which are slipped over the hooks 48. The said head bands E have hook and slide respectively at the rear extremity for connecting one to the other and thereby fastening the respirator to the face of the wearer.
The face piece A has lateral protrusions 48'. The positioning of the head band attachment is so arranged that the head bands lie over the protrusions 49' when in position, the pulling of the said head bands causes a compression on the said protrusions 49' and thereby the face piece 1 at its lateral area is tightly drawn toward the face. the flanges l5 of the face piece adjust themselves in the lateral nasal depression area and a tight leak proof juncture is formed thereat.
It is to be noted that several advantages are gained by using a cone shaped filter pad made as herein described. First, a large filter surface area is maintained in a small casing or filter housing. Second, folding of the pad is very simple. It requires no sewing or cementing at the folds or edges. Third, a perforated and corrugated spacer inserted at the hollow apex portion of the pad is useful for maintaining the large surface area.
Other advantages to be noted are as follows: The nose area is made comfortable and also leak proof by the flange and pad arrangement thereat. An improper nose engaging respirator causes irritation to the wearer and he will wear the.
respirator hanging at his neck for relief, and expose himself to the dangers of the dust or fumes rather than forego the irritation of the respirator. Also the displaceable foraminous screen element for the valve provides for longer life to the said valve. Also the lateral face piece protrusion provides an automatic means to secure in a leak proof manner the engagement of the said face piece and the face of the wearer. Also the displaceable foraminous screen element for the filter pad aids in maintaining the said pad in good repair and its edges aid in securing same at the inlet port of the filter housing.
Having thus described my invention, I claimas new and desire to secure follows:
1. In a respirator, a face piece of molded elastic material adapted to engage the face of the wearer and being padded at the bridge of the nose area for comfort to the nose thereat, and the said face piece having a set back portion below the nose line and having a screened exhalation valve located at the said set back porby Letters Patent as As this pulling and compression occurs tion, a filter unit, comprising a casing having .7
removably mounted therein a filter pad which pad has a plurality of folds, and the said casing communicating with the said face piece and being located adjacent thereto, and the said face piece having protrusions located sidewise in the lateral nasal area, a pair of head bands being attached laterally to the rear of the said casing in the lateral area of the face piece and arranged to press upon the said protrusions and thereby provide a leak proof connection between the face of the wearer and the face piece of the respirator.
2. In a respirator, a face piece adapted to engage the face of the wearer and having a flexible inturned flange at the nasal area and the said flange having two slits located to correspond to the sides of the bridge of the nose, and the portion of the flange between the said slits folded and cemented at its edges to the inner adjacent part of the face piece and thereby forming a pad thereat to provide comfort to the bridge of the nose substantially as described.
3. A separator for filter type respirators including a casing having an inlet port with filter means comprising a filter pad with a plurality of folds and an aperture, a marginal seat provided at the said'inlet port, and a foraminous screen element, the said pad being enclosed within the said casing and the aperture thereof made to register with the said inlet port in a manner whereby the edges of the said pad are impingingly held between the said seat and the periphery of said element, and the said element is in outer protective relation to the said pad.
4. A separator for filter type respirators ineluding a casing having an inlet port with filter means comprising a hollow filter pad formed by means of a plurality of folds, the said pad having an aperture registering with the said inlet port,.
and a screen foraminous element, the said pad being removably mounted within the said casing and the said element is disposed in outer confronting relation to the said pad, and thereby protects the same from deleterious influences.
5. In a respirator, a face piece adapted to engage the face of the wearer in covering relation to the nose and mouth, and having a set back portion below the nose line, an exhalation valve located at the said set back portion, a foraminous screen element for the said valve and means to removably mount the said element in outer protective relation to the said valve, whereby repair and replacement of said valve is made easy.
6. In a respirator, a face piece adapted to engage the faceof the wearer in covering relation to the nose and mouth, an exhalation valve being connected to the said face piece in the region of the nose and mouth, an apertured lug located adjacent the nose covering portion, and a foraminous screen element removably mounted in outer confronting relation to the said valve by having a hook attachment which hook is inserted in the said apertured lug, and thereby the said element protects the said valve from outer deleterious influences and also permits easy access thereto flange, and the said element being disposed in outer protective relation to the said pad.
8. A separator for filter type respirators including a casing having an inlet port with filter means comprising a marginal seat, a hollow and substantially cupped shaped filter pad having a 'plurality of folds to increase its surface filter area, and a foraminous screen element having a marginal flange, the said pad being removably mounted within the said casing by having its edges impingingly held between the said seat and the said flange, and the said element being disposed in outer protective relation to the said pad.