US 2176380 A
Description (OCR text may contain errors)
N. SCHWARTZ Ost. 17, 1939.
RESPIRATOR Filed Nov. so, 1956 INVENTOR lluente Oct. i7, i939 UNiTED STATES Parser ic This invention relates to lter type respirators adapted to cover the nose and mouth of the wearer for the purpose of protection 'against dust -fumes and injurious gases andis a modiflcation 5 of my copending application for Letters Patent Serial No. 111,754.
The invention broadly aims to provide a respirator of minimum size and weight while affording a maximum area of iiltration and also to facili- IU tate the replacement of the lter material and also to provide increased security at the marginal attachment of thefilter material and also to provide facilities for comfort at the face engaging section. l
l5 More particularly the invention resides in providing a flanged arrangement at `the chin section for engaging the chin below the submaxillary region. manner of construction is that it permits the head 20 band to be fastened at the top ofthe head instead of at the back of the neck. Some wearers are annoyed by the head band being secured at the back/of the neck and also at times certain individuals have susceptibility for boil formations 26 at the back of the neck.
Another feature is an additional security provided at the marginal attachment of the iiiter material, namely the lter material isprovided with clasps that impinge thereat at both sides.
3i) Another feature is that the area of filtration is increased because the filter material is raised from its supporting wall directly 'at its marginal attachment thereby providing for ltration at the said part as well as at the remaining filtra- 35 tion area. The means provided for raising the lter material has an additional function which is to impinge on they said filter material and thereby tighten the clasp thereon.
Another feature is that the lter unit is convex in its lateral aspect and level in its vertical aspect which shape permits the provision of a largefilter pad.
With the above recited and other objects in view reference is had to the following description and accompanying drawing in which there is exhibited one exampleA or embodiment of the invention, while the. claims deiine the actual scope of the same.
@ in the drawing:
The advantage obtained by this (CE. 12d-3.45)
ing means attached to the inner side of the casing wall.
Figure 4 is a modified form of the lter unit, invsection, showing a spacing element attached to the marginal area. g
Figure 5 is a perspective view of the spacing element prior to its attachment at its applied position. v
Figure 6 is a section on line 6 6 of Figure 2, showing in detail the means of connection of the 10 body portion of the respirator. with the filter unit.
Referring to the drawing by character reference, A designates the face piece of the respirator, B designates the filter unit, C designates the valve 15 and D the headband.
The face piece A of the respirator is preferably constructed of `molded elastic rubber or its equivalent and has flanges provided at the chin part 5 and also at the nose part 5a. The flange 5 at go the chin part is directed at an acute angle with relation to the respirator face piece A, and it engages the chin of the wearer at its lower part, that is, at the submaxillary region. The face piece A has flaps 6 at the cheek area of the face 25 for dat contact with the face when in applied position.
The face piece has a horizontal set back below the nose line which set back has an upper horizontal wall 'i and a vertical wall'ii. There is so an opening in the horizontal wall 'i for connection with an exhalation' valve C.
The head band D has means provided at the cheek portion 5 of the face piece for attachment therewith, and is directed backward and 35 upward to fasten at the occipital area of the head. thereby securing the face piece of the respirator to the face of the wearer.
There are two forms of lter units in this improved respirator. In ythe rst form the casing 9, of the filter unit B, has an anterior convexity. The wall it, of the casing t, curves forward in the lateral position, while in its vertical position it is substantially plumb. The said wall i@ has protrusion elements li which are preferably d5 of dat or of oval wires attached at the forward or anterior side of the said wall, for the purpose of spacing the iilter material from thewall it. At the marginal portion of the wall it, there is an indent iii/which causes a protrusion ld, which t0 vprotrusioizi it is directed outwardly to impinge upon the filter material i2, at the 'edges thereof and also to raise the said material i2 and thereby space it from the said wall i@ at thel said marginal portion, d@
` The casing- 9 in the first form has a marginal ii'ange I5 directed outward and the said flange I5 is inturned at I6 to impinge upon the lter material I2. The said casing is preferably made of light aluminum material or its equivalent.
The casing 9 connects with the face piece A by means of registering holes II at the side areas and the said holes are connected by means of namely the protrusion I4 impinging thereon from' eyelets I8.
It is therefore to be noted that th iilter material I2 is removably secured at the marginal area of the casing by a clasping arrangement,
one side and the inturned flangeI I6 impinging it from the other side. Also it is to be noted that the protrusion I 4 has an added function which is to raise the filter material and space the same from the wall I and thereby cause the filtration to be free and unobstructed at such marginal area.
I Itis to be noted that the marginal formation of the casing 9, in the first form of the invention is as follows: There is an angular forwardly directed marginal rim, the edge of the rim being directed outward, thereby forming an outward extension. The periphery of the said outwardly directed extensionis curved inwardly, thereby forming the inturned flange I and I6. Thus an inwardly directed groove is formed between the said outward extension and the said inturned flange. Filter material is inserted within the said inwardly directed groove. 'I'he insertion is done by finger manipulation or by a small tool, such asa penknife, small screw-driver or a letter opener. It is to be noted that the casing of the lter unit is preferably of a light metal as l aluminum and the marginal rim is substantially rigid to effectively space the filter material I2 at its marginal portion. The filter material is secured rmly but removably in the said groove. The easiest way to -remove the said filter is to place a finger in the eyelet hole and press the material outward and the material readily snaps out of its mounting.
In the second form of this invention the spacing means at the marginal area is a wire Il. The said wire is adjusted to the said marginal area of the casing 9 preferably by soldering the said wire to the casing wall Il at the said marginal area. The said wire I8 functions as the protrusion I4 functioned in the first form. Namely, it spaces the filter material I2 from the wall III and also impinges the filter I2 at one side. 'I'he alvasso equipped to make the first form and other manufacturing plants are equipped to make the seclond form. The Ishape of the filter unit in the second form is the same as in the first form.'
It is to be understood that the clasping arrangements herein described are practical for use in circular, oval or any shaped iilter units also any contoured shapes, such as convex, concave or other horizontal or vertical designs. The edges of the lter material are inserted between the inturned flange and the rear protrusion by meansv a of a flat instrument, such'as a letter opener or a small screw driver. The filter material is secured'thereat and held tightly between the flange and the protrusion, but it may be removed upon pressure, namely, by pushing the finger or a dull vinstrument through the eyelet opening and pressing'on the filter material from within outwards. This pressure causes a dislocation of the insertion and the removal of the lter pad.
Hiaving thus described my invention, I claim as new and desire to'secure by Letters Patent:
1. A respirator, a body portion connected to a filter unit having filter material and a wall with, 'an inwardly directed peripheral groove and a circumferential wire attached to the rear side l of the said groove, the edges of the said filter` material being inserted in the said groove and removably secured thereat by the said wire im.- pinging upon the marginal portion of the said material. .y
2. In a respirator, a body portion connected to a filter unit having a filter pad and a wall with an inwardly directed peripheral groove and a v circumferential wire located in the said groove, the said pad being removably mounted in the said groove in a confronting and a spaced relation to the said wall and the said wire arranged in' the saidgroove in a manner whereby it impinges upon the edges of the said pad to removably secure the said edges in the said groove and 'also to maintain a leak proof joint thereat.