|Publication number||US2435721 A|
|Publication date||Feb 10, 1948|
|Filing date||Aug 3, 1943|
|Priority date||Aug 3, 1943|
|Publication number||US 2435721 A, US 2435721A, US-A-2435721, US2435721 A, US2435721A|
|Original Assignee||Werner Lehmann|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (17), Referenced by (19), Classifications (7)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Feb. 10, 1948. w, ANN 2,435,721
' SPRAY MASK Fild Aug. :5, 1945 INVENTOR 7b 5 wernerlebmann Patented Feb. 10, 1948 UN I TED PATENT FF .1 CE.
SPRAY MASK We ner Lehmann, Fresno, Calif- .Application August 3, 1943, Serial No. 497,175
7 6 Claims.
.As to all common subject matter this applica tion is a continuation of abandoned application Serial N 0.. $2 ,439, filed January 2, .l;94i:2, and the invention relates :in general to an improved respirator .ofxthe type commonly known as spray or dust masks which are employed by spray pa nters, tractor operators and persons engaged in occupations where the air carries .Ior i n mat .ter; the inventi n relatin in particular to movements :in that t pe of respi at r whi h nludes a -.,face.-.eneas ug oi a size and com fi urati n :to cover th nose and mouth of t weare and a replaceab e fi ter disc or red disposed over an air entry open ng in said c i One ob ec or this i vent on t p ovide a espi a of the de ribed whi h i c ud s a f ce nga in cup h ing about its rear ed e a soft, porous face-engaging cushion band or bead, preferably a roll of knit-cloth, such cushion bead being sufiiciently soft that the bead deforms readily when engaged with the wearers face and cl s ly iol ows he con our th of; t porosity of said cushion bead permitting the same to function as an air filter.
Additional objects of the invention are to provide .a respirator designed so that air entry is not subject to any substantial restriction other than that resulting from passage through the filter disc and filter bead; and '00 provide a respirator in which the filter pad, as well as the filter bead, can be very readily removed replaced.
A further object is to provide a respirator of the type described having .a perforate guard plate mounted to protect the filter pad and the backins screen irom damage While the deyioe is in use.
An additional o j t is to provide a respirato which includes a face engaging cup having a moisture absorbing sponge removably mounted therein in a novel manner.
A further object is to provide a simple and inexpensive device and yetone which will be exceedingly effective for the purpose for which it is designed.
These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.
In the drawings similar characters of reference indicate corresponding parts in the several views. a Figure 1 is a front elevation of the improved respirator.
Figure 2 is a cross section on line 22 of Fig. 1.
Figure 3 is a rear elevation of the device.
Figure 4 is a fragmentary sectional view showing the deformation of the cushion filter bead whenengaged with the wearers face.
Referring now more particularly to the char-- actors of reference on the drawings, the respirator comprises the usual resilient rubber body or cup I of a configuration and size to "enclose the wearers nose and mouth when the rear edge of said cup is in engagement with the face; such body at its rear end being substantially pearshaped and tapering iorwardly to the Iront end which is formed with an air entry ort 2- The respirator is secured in place on the face by m ans .of a conventional elastic head strap 3 which connects from si e to side of b dy .L
About its rear edge the body I is fitted w th a face-engaging cushion filter head .4 which extends unbroken thereabout and whi h is pref rably an endless roll of porous knit-cloth or the like; such cushion bead 4 be ng sufiiciently so that with placement of the respirator n the wearerfs race the t nsion of head strap .3 ca ses the bead to deform, as shown in Fig. 4, and closely follow the irregular contour of the face, the latte being indicated diagrammaticall at *TIlhe hea 4 is secu-redto the ody I y' tional-ly enga n a l din l portion 6 of bead 4 in the channel 1 formed ,in and open to the rear edge of the body I. The channel 1 is defined by opposed, continuous, resilient lips 1a and 1b; said lips initially being in relatively close ly adjacent relation and sprung apart for insertion of bead portion '6 so as to firmly hold said bead in place, In addition, the lip 'l'b projects rearwardly a greater distance than lip Ta whereby to assure of outward displacement of the head when the device is in use.
As the bead .4 is of a porous material, such as knit cloth, air can flow therethrough, as shown by the arrows in Fig. 4, and the bead provides a filter in supplement to a filter can which the device includes, and as nowdescribed.
The filter can ,is mounted on the forward end of the body in overlying relation to port 2 and. is constructed i i-the following manner:
The filter can comprises a cylindrical relative-- ly shallow screen holder .8 of substantially greater diameter than port 2 disposed in adjacent ync.- metrical overlying relation .to the latter; this screen h lde in ludin a radial back flange 9 which engages the ioremost end or body I and includes circumferentially spaced fingers Ii] which extend through port 2 at the periphery thereof and are bent radially outward into clamping engagement with the portion of body I immediately surrounding said port. A circular screen H is mounted in the front of holder 8, being of substantially the same diameter as the latter and secured therein by an inwardly extending radial flange l2 behind the screen and spaced from fiange 9.
A cylindrical filter holder l3 cooperates with the screen holder and normally laps the latter, as clearly shown in Fig. 2. The filter holder I3 is adapted to have a filter disc or pad l4 removably seated therein, and when said holder is in cooperating position with screen holder 8, the filter disc [4 is disposed in face to face engagement with screen I l and holds the latter in place. The filter holder includes an outwardly convex cover or guard plate [5 mainly spaced from the filter and having a multiplicity of relatively large perforations or openings therethrough.
The filter holder I3 is hinged in connection with the screen holder 8 at the bottom by hinge means indicated at [6, whereby the filter holder may swing forwardly or open relative to screen holder 8 to permit of removal and replacement of the filter disc l4. Finger elements ll depend in divere'ent relation from the holders 8 and I3 respectively, whereby it is only necessary to grasp said elements and pinch the same together to effect opening of'filter' holder l3. A torsion spring 18 extends about the pin of hinge l5, and the legs of the spring engage the inner faces of elements ll, normally urging said elements apart and maintaining holders 8 and I3 in closed relation.
A small sponge or similar absorbent body l9, adapted to absorb excess moisture within the device, is disposed in the body I at the bottom between the filter can and the bead 4; such obsorbent body being removably held in place by a cross wire 20.
From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention set forth herein.
While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.
Having thus described my invention, what I claim as new and useful and desire to secure by Letters Patent is:
1. In a respirator which includes a cup-like body open at one end for engagement with a wearers face'to enclose the nose and mouth, said body having an air intake port in the other end, a filter can mounted on the body at said other end in communication with said port. and means to support the respirator On a persons face; a face engaging cushion bead extending about the body in unbroken relation to said one end thereof, and means securing said bead on the body, said cushion bead being a soft, deformable, filter forming roll of porous woven cloth.
2. In a respirator which includes a cup-like body open at one end for engagement with a wearers face to enclose the nose and month, said body having an air intake port in the other end, a filter can mounted on the body at said other endin communication with said port, and means to support the respirator on a person's face; a
face engaging cushion .bead comprising a soft deformable roll of porous, filter forming woven cloth extending unbrokn about said one end of the body, said end of the body having an endless channel formed therein, and a continuous portion of the roll being engaged in said channel.
3. A respirator as in claim 2 in which said endless channel of the body is defined by opposed, continuous lips; said lips being resilient and engaging said continuous portion of the roll in frictional holding relation.
4. A respirator as in claim 2 in which said endless channel on the body is defined by opposed, continuous lips; said lips being resilient and engaging said continuous portion of the roll in frictional holding relation, the outermost lip extending rearwardly a greater distance than the other lip.
5. In a respirator which includes a cup-like body open at one end for engagement with a wearers face to enclose the nose and mouth, and a face engaging cushion bead secured in connection with and extending about said one end of the body; said cushion bead being a soft, deformable endless roll of porous woven cloth, said roll forming a filter between the body and the wearers face.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 314,485 Spencer Mar. 24, 1885 652,400 Moore June 26, 1900 958,569 Venner May 17, 1910 1,079,251 Macrini Nov. 18, 1913 1,313,745 Schwartz Aug. 19, 1919 1,398,685 Gordon Nov. 29, 1921 1,453,365 Malcom May 1, 1923 1,890,857 Loftin Dec. 13, 1932 1,926.500 Sackner Sept. 12, 1933 2035,097 Schwartz Mar. 24, 1921 2,055,853 Schwartz Sept. 29, 1936 2,367,367 Olson Jan. 16, 1945 FOREIGN PATENTS Number Country Date 45,332 Netherlands Mar. 15, 1939 117,262 Australia July 13, 1943 245,909 Great Britain Jan. 21, 1926 379,381 Great Britain Sept. 1, 1932 444,962 Great Britain Mar. 25, 1936 OTHER REFERENCES Bureau of Mines Technical Paper #82 (1917), pp. 64, 65.
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|US20070175479 *||Jan 27, 2006||Aug 2, 2007||David Groll||Apparatus to provide continuous positive airway pressure|
|US20080142015 *||Feb 19, 2008||Jun 19, 2008||David Groll||Apparatus to provide continuous positive airway pressure|
|US20100319105 *||Jun 23, 2009||Dec 23, 2010||Cody Fairbanks||Facial Spacer Device and Associated Methods|
|USD746437 *||May 22, 2014||Dec 29, 2015||3M Innovative Properties Company||Respirator mask having a communication grille|
|USRE39493 *||Feb 25, 1998||Feb 27, 2007||3M Innovative Properties Company||Respirator having snap-fit filter cartridge|
|U.S. Classification||128/206.17, 128/206.22, 128/206.24|
|International Classification||A62B18/00, A62B18/02|