Патент USA US2112213код для вставки
‘March 22,. 1938, I ‘ N. SCHWARTZ I 2,112,213 RILTERTYPE RESPIRATOR Fileq. Dec; _s,_ 1955 ‘ zisheets-sh'eet 1 March 22, 1938. . N, SCHWARTZ ' ' 2,112,213 FILTER TYPE RESPIRATOR Filed Dec. 5, 1955 2 Sheets-Sheet 2 21g 31 2 ' ' INVENTOIR Patented Mar. 22, 1938 2,112,213 ‘ UNITED STATES PATENT OFFICE 2,112,213 FILTER ms aEsrmA'roa Nathan Schwartz, New York, N. Y. Application December 3, 1935, Serial No. 52,627 A. i 6 Claims. (Cl. 128-146) ‘ This invention relates to ?lter type respirators Referring to the drawings by character refer ence, the respirator includes a face‘ piece desig adapted to cover the nose and mouth for the purpose of protection against dust, fumes, gases nated generally by the reference character A and a ?lter unit designated generally by the refer ence character B, and the facepiece being pref and bacteria, and is a modi?cation of my co 5 pending patent application Serial Number‘ 44,694, ?ling date October 12, 1935 now Patent No.‘ erably constructed of molded rubber or an equiv alent ?exible material having the properties and 2,070,241.‘ . The object of this invention is‘to increase the characteristics of rubber. The face piece con ?ltering e?lciency of?lter type respirators. by forms generally to the shape of the face- in the 10 means of locating ?lters advantageously. That is the positioning of the ?lters in such relation to each other as to obtain increased ?ltering ef ?ciency without e?‘ecting a corresponding in region of the nose and mouth and is formed with 10 a hollow nose covering portion l0 having a lower horizontal wall II. The mouth and chin cover ing portion I 2 is provided with an opening l4 and is set back and it constitutes part of the rear 15 Another object of this invention is to simplify - wall of they ring ?lter unit B. The lower hor 15 construction by including the ?lter unit and face izontal wall II also constitutes part of the cir part of the respirator in one mold cavity. cumferential wall of the ring ?lter unit B. The Another object of this invention is to make the mouth covering portion I2 is provided with a respirator practical for dry ?ltration as well as vertical wall l3 which in one form of these type for wet sponge ?ltration. . respirators contains an opening [4. The mouth 20 Another object of this invention is to increase covering portion is stepped back at its chin part . the ?ltering area by providing for air space be ' in a substantial horizontal position l5 and it con tween the ?lter support and the moldedrubber tains 9. depending tubular boss 16. support. ' ‘ \ The face piece has attachedrat the sides there With the above and other objects in view, the of a webbing fabric material I‘! which webbing 25 inventionis more particularly disclosed in the band has at its end, hooks l8 and ring ill by following speci?cation and the accompanying which means the respirator 'is fastened to the crease in the resistance to air ?ow. ' drawings wherein a preferred embodiment, exempli?es ‘the invention, while the appended face of the wearer. 30 claims cover variations and modi?cations thereof. In the drawings; ‘ The ?lter ring B is constructed of the same material as the face piece A and they are molded 30 in a‘ single cavity mold and are therefore depend - Figure 1 is an anterior view of the improved ent on one another and are joined in the said.‘ respirator showing the face part of the respirator having attached thereto elastic bands, and also showing the ring ?lter unit at the lower part of the face piece. mold cavity at the mouth covering vertical por tion l3 and also at the lower wall set back ll of'the nose covering portion III. In Figure 1 is clearly shown the anterior view, and the webbing band attachment 20 indicates Figure 2 is a side view of the same. Figure 3 is a rear view thereof. manner of attachment of the webbing or elastic ' band ll to the face piece A of the respirator. The face piece is also provided with a nose ?ange 2| 40 which is adapted to engage the'nasal face por-' tion and it also has a chin ?ange. 22» adapted to engage the face at the chin part of the face andv it has provided side ?aps 23 for engaging the fac Figure 4 is a verticalv sectional view there 40 through taken approximately in the line 4-4 of Figure 3, and it shows front and rear ?lter ele ments having an intervening air chamber. Figure 5 is a similar cross section at the line 4-4 of Figure 3, but a combination of gauze and 45 sponge ?lter is shown. - - at cheek portion. ‘ - Figure 6 is an anterior view and it shows the interior side of the rear wall of the‘ ?lter ring The ?lter ring part B has anteriorly an in wardly directed flange 24 and this ?ange forms and sectionally shows the foraminous support covering the interior of the rear wall, and also 50 ‘the ?lter material attached to the foraminous the outer wall of the external circumferentml - Figure '7 is across section, like Figures 4 and 5 ' but it shows the: third‘. form of this invention, groove 25. The ?lter ring has a circumferential wall 28 which in one part is a section of lower nose covering wall ll. The rear wall 21 of the ?lter ring is in part joined with the vertical sec tion l3‘ of the mouth covering portion l2, and namely the ?ltration area is enlarged and air w. is entering the ?lter device at front and at rear. ing ll ‘or the inhalation of ?ltered air. The support. . 0 in one form of this invention contains an open arrears 2 and the opening M, as is indicated in Figure 4, rear wall 2? has provided at its inner side, inter rupted rib elevations 28 which cause the formation by the arrows. An advantage is present in the fact that the air is made to pass two ?lters sepa rated by an air chamber. The second form of this invention is clearly shown in Figure 5. Here we have the air pass ing through the ?lter material 31, then the fo raminous support 34, then the sponge ?lter ma of grooves ‘29 and which grooves 29 become un interrupted and form a continuous air ?ow space 29. The lower horizontal wall ll of the nose covering portion i0 is a part of the ring cir cumferential wall 26 and in one form of this invention contains an opening 30 which connects terlal 39, whence it converges at opening i4 and . is ?ltered and ready for inhalation, the sponge type of ?lters is desired when solvents or neu the ring ?lter B with the face piece of the res pirator A. The lower horizontal wall l5 contains an open ing in the tubular boss l6, within thistubular boss i6 is inserted a ?utter valve which is kept open by a comparatively rigid metal tube 32. The ?utter valve’s usefulness is the permitting 15 of. easy exhalation. ‘ The ring ?lter unit which we designate with the character reference B has at its internal por tion and at the outer edge a circumferential 20 groove 25 and it also is provided with a similar internal groove 33 and the rear wall 21 de?nes its outer side. The rear wall 21 also has rib ele vations 28 and grooves 29. It also contains the tralizers are required in a respirator. For ex ample at acid works, an alkaline solution is bene?cial. The third form of this invention is plainly lo shown in Figure 7. Here we have doubled the surface area of ?ltration. Air is entering as indicated by the arrows, through the ?lter ele— ment 31, and also through the hole openings 38 The air 20 entering in the openings 38 ?lls the air space groove 29 and is ?ltered in its passage through the ?lter material 36. The interrupted ribs 28, which are present in the rear wall 21. opening it for air passage to the face part of ‘ make the continuous uninterrupted groove 29 YO Ll The grooves 25 and 33 contain and therefore the surface area at the rear ?lter the foraminous supports 34, these foraminous is equal to the surface area at the front ?lter. supports are preferably of metal construction and Therefore the resistance to air ?ow is diminished are comparatively rigid so that there is a ?rm about 50% and therefor the filter material may be increased in density or an additional ?lter supporting hold for the ?lters and for the main layer may be added, and thereby greater ei? 30 tenance of the air chamber 35, which is located‘ between them. Both foraminous supports 34 ciency may be obtained. If greater e?iciency is not required then there is still greater ease in have attached ?lter elements 36 which ?lter ma 25 the respirator. terials are usually of textile or felt fabric. support 34. In one form of this invention an extra. removable ?lter fabric material 31 is in serted, and it forms a front ?lter. In another form of this invention a sponge ?lter 39 is used 40 and its insertion into the ring ?lter B takes place through the opening i4. breathing and therefore the improvement is still The attachment of the ?lter material is usually made 35 at the edge circumference of the foraminous . In my copending patent application Serial Number 44,694 the face piece A is separate from the ring ?lter unit B and the two are joined at 45 the opening in the set back horizontal wall II. The need in some instance for a separate ring ?lter unit is that more and thicker ?lter mate rials may be used and conveniently so used. Therefore in the dry ?lter type respirators this unit, has a decided value for use as protection against dangerous dust or fumes where the re quirement for separation is very high. That is where it is required to ?lter almost 100% of the foreign substance. However, the said type res pirators, namely those having separate ring ?lter units, are not practical for moist ?ltration, that is, a sponge ?lter cannot be accommodated. But, with the present modi?ed invention such a 60 sponge ?lter can be accommodated. Sponge ?l ters are often needed in case a neutralizing solu tion is desired. The present modi?cation is less costly clue to labor saving. Time is required to Join the face piece and the ring ?lter unit. The present modi?cation and improvement may be used in three different forms. One form is clearly shown in Figure 4, which is a cross section. The air intake in this form is at the opening I4 which opening is in the 70 vertical wall i3 of the mouth covering portion ii. The air is ?ltered by means of ?lter ele ment 3?, thence the air passes to the air cham ber 35, then it is again ?ltered by'the ?lter ele ment 36, then it passes through the foraminous 75 support 34, then into the ‘zrooved air space 29 ' In Figure 6, it is clearly shown that the in 35 terrupted elevated ribs 28 form an- uninterrupted groove 29 which groove is continuous to the open ing H. The need of this arrangement is present .in the first and third forms of this type of im proved respirators and the reason therefore is that it provides a greater ?ltering area. In Fig— ure 4 and in Figure 7, arrows indicate air ?ow in the said grooves. The horizontal set back below the nose line of the respirator is a distinct feature in this im proved respirator as well as in my improved 50 type, namely the type with the joined ring ?lter 65 apparent. respirator described in my copending applica tion for United oStates Letters Patent, Serial Number 44,694, ?ling date, October 12, 1935. The said horizontal set back H is clearly shown,in 50 Figures 2, 3, 4, 5, and '7 and this set back is made with the object in view, that the vision of the wearer of the respirator shall have no down ward obstruction. Because frequently on ?oors of workrooms where respirators are worn there are tools and other materials and if these become unseen due to a respirator obstruction they may cause tripping and falling. What is claimed is: 1. A ?lter type respirator including a face part 00 having a hollow nose covering portion formed with a lower wall and a set back mouth and chin covering portion and a ?lter unit located under said nose covering portion and in front of the mouth and chin covering portion, and the ?lter unit comprising a casing and the said casing being an integral part of the face piece of the respirator at the horizontal nose covering por tion and at the vertical chin and mouth covering portion, and the ?lter unit having communica 70 tion with the ‘face part of the respirator by means of an opening in the mouth and chin covering portion. .2. A ?lter type respirator having means pro vided for engaging theface of the wearer and_ 2,112,213 having a hollow mask face portion, including a noge covering portion, formed with a lower wall an a set back mouth and chin coveringv portion, a circumferential wall being a part of the lower Wail of the nose covering portion and extending downward therefrom and forming a ring, the said circumferential wall having a rear wall which in part is the set back mouth and chin covering portion, thesaid ,rear wall having an opening provided at the set back mouth and chin covering part, the said circumferential wall hav ing at its anterior, annular inwardly directed ?angesand internal'grooves de?ned in part by said ?anges, ?lter elements and foraminous sup 15 port therefor located within said groove and the ?lter element retained in place by the said in wardly directed ?anges. 3. A ?lter type respirator having means pro vided for engaging the face of the wearer and 20 having a hollow mask face portion, including a nose covering portion, formed with a lower wall and a set back chin and mouth covering portion, a circumferential wall being a, part of the lower wall of the nose covering portion and extending down therefrom and forming a ring, the said 3 ring having av rear wall which in part is the set back chin and mouth covering portion, the said casing being provided with suitable ?lter element which ?lter element is properly located within the said casing and the said casing having an opening connection with the hollow mask por tion. 5. A ?lter type respirator having a hollow mask face body, the said hollow mask face body having a set back below the nose line and an 10 opening for air intake located in said set back and having direct connection at the said open ing with a ?ltering device which includes a cas ing, part of which casing is an in gral part of the face body and which casing is provided at 15 its intake with a circumferential groove for con taining a supporting foraminous element and a ?lter: material removably placed anteriorly to said foraminous-support and held in place by means of inwardly directed ?anges. 20 6. A ?lter type respirator having a hollow mask face portion wherein is provided a set back below the nose line, a ?ltering device partly lo cated within the outer portion of said set back and also parts of the walls of the ?ltering device 25 circumferential .wall having a rear wall which in ' are simultaneously parts of the walls of the set part is the set back chin and mouth covering back portion, and the said ?ltering device hav portion, the said rear wall containing at its in-_ ing a circumferential wall and the circumfer terior side interrupted elevations for the forma 30 tion of uninterrupted air ?ow grooves, the said ential wall having grooves located internally at the edges and the forward groove is de?ned by circumferential wall having at its internal rear anterior inwardly directed ?anges, ‘at its anterior end a circumferential groove formation, the said part and the rear groove is defined by the rear groove formation is de?ned in part by the rear wall of the ?ltering device,'which rear wall forms .wall of the circumferential wall, the said circum the ‘posterior part of the groove, and the said ferential wall having at its anterior, annular in rear wall being provided with interrupted ele 35 wardly directed ?anges, ?lter elements and fo vated ribs and between said ribs are formed raminous support therefor located within said groove formations, and said rear wall having groove and the ?lter element retained in place by holes provided at its lower section for air intake the said ?anges and an opening provided between purposes, foraminous supports." having attached “the ring ?lter and the hollow mask body. ?lter materials closely held by the grooves lo 4. A ?lter type respirator having means pro cated at the edges of the circumferential wall, 40 vided for engaging the face of the wearer and an opening provided for air intake located in" the having a hollow mask face portion, including a horizontal portion, of the set back and the said nose covering portion and a set back chin and opening connecting with the air chamber formed 45 mouth covering portion, a'circumfere'ntial wall between the two foraminous support elements being a part of - the lower wall of the nose cov which'support elements have ?lter materials at 45 ering portion and extending therefrom down tached. v ward and forming a casing and the said casing NATHAN SCHWARTZ.