Title:
Spray mask
United States Patent 2435721


Abstract:
As to all common subject matter this application is a continuation of abandoned application Serial No. 425,439, filed January 2, 1942, and the invention relates in general to an improved respirator of the type commonly known as .spray or dust masks which are employed by spray painters, tractor...



Inventors:
Werner, Lehmann
Application Number:
US49717543A
Publication Date:
02/10/1948
Filing Date:
08/03/1943
Assignee:
Werner, Lehmann
Primary Class:
Other Classes:
128/206.22, 128/206.24
International Classes:
A62B18/02
View Patent Images:
US Patent References:
2367367Method of making weather strip1945-01-16
2055853Separator for filter type respirators1936-09-29
2035097Separator for filter type respirators or the like1936-03-24
1926500Cord or edge roll for upholstering furniture1933-09-12
1890857Mothproof receptacle1932-12-13
1453265Tractor1923-05-01
1398685Air-filter1921-11-29
1313745N/A1919-08-19
1079251N/A1913-11-18
0958569N/A1910-05-17
0652400N/A1900-06-26
0314485N/A1885-03-24



Foreign References:
NL45332C
AU117262B
GB245909A1926-01-21
GB379381A1932-09-01
GB444962A1936-03-25
Description:

As to all common subject matter this application is a continuation of abandoned application Serial No. 425,439, filed January 2, 1942, and the invention relates in general to an improved respirator of the type commonly known as .spray or dust masks which are employed by spray painters, tractor operators and persons engaged in occupations where the air carries foreign matter; the invention relating jn -particular to improvements in that type of respirator which includes a face-engaging unit f a size and configuration to cover -the nose and moutih of the wearer, and a replaceable Vlter disp or pad disposed over an air entry opening in said pup.

One object of this inventin is to provide a respirator of the type described which includes a face engaging cup having about its rear edge a soft, porous face-engaging cushion band or bead, preferably a roll of knit-cloth, such cushion bead being sufficiently soft that the bead deforms readily when engaged with the wearer's face and closely follows the contour thereof; the 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 to prpvide a respirator in which the filter pad, as well as the filter bead, can be very readily removed and 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 backing screen from damage while the device is in use.

An additional object is to provide a respirator 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 yet one 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 r-eference indicate corresponding parts in the several views.

Figure 1 is a front elevation of the improved respirator.

Figure 2 is a cross section on line 2-2 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 when engaged with the wearer's face.

Referring now more particularly to the characters of reference on the drawings, the respirator comprises the usual resilient rubber body or cup I of a configuration and size to enclose the wearer's 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 forwardly to the front end which is formed with an air entry -port 2. The respirator is secured in place on the face by means of a conventional elastic head strap 3 which .connects from side to side of body I About its Year edge the body I is fitted with a face-engaging cushion filter bead 4 which extends unbroken thereabout and which is preferably an endless roll of porous knit-cloth or the like; such cushion bead 4 being sufficiently soft that with placement of the respirator on the wearer's face the tension of head strap 3 causes the bead to deform, as shown in Fig. 4, and closely follow the irregular contour of the face, the latter being indicated diagrammatically at 5. The bead 4 is secured to the body I by frictionally engaging a longitudinal portion 6 of bead 4 in the channel 7 formed in and open to the rear edge of the body 1. The channel 7 is defined by opposed, continuous, resilient lips la and 7b; 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 7b projects rearwardly a greater distance than lip 7a whereby to assure of outward displacement of the bead 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 now described.

The filter can is mounted on the forward end of the body in overlying relation to port 2 and is constructed in the following manner: The filter can comprises a cylindrical relatively shallow screen holder 8 of substantially greater diameter than port 2 disposed in adjacent symmetrical overlying relation to the latter; this screen holder including a radial back flange 9 which engages the foremost end of body I and includes circumferentially spaced fingers 10 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 II 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 12 behind the screen and spaced from flange 9.

A cylindrical filter holder 13 cooperates with the screen holder and normally laps the latter, as clearly shown in Fig. 2. The filter holder 13 is adapted to have a filter disc or pad 14 removably seated therein, and when said holder is in cooperating position with screen holder 8, the filter disc 14 is disposed in face to face engagement with screen II and holds the latter in place.

The filter holder includes an outwardly convex cover or guard plate 15 mainly spaced from the filter and having a multiplicity of relatively large perforations or openings therethrough.

The filter holder 13 is hinged in connection with the screen holder 8 at the bottom by hinge means indicated at 16, whereby the filter holder may swing forwardly or open relative to screen holder 8 to permit of removal and replacement of the filter disc 14. Finger elements 11 depend in divergent relation from the holders 8 and 13 respectively, whereby it is only necessary to grasp said elements and pinch the same together to effeet opening of filter holder 13. A torsion spring 18 extends about the pin of hinge IS, and the legs of the spring engage the inner faces of elements 17, normally urging said elements apart and maintaining holders 8 and 13 in closed relation.

A small sponge or similar absorbent body 19, 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 wearer's 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 ireans to support the respirator on a person's face; a face engaging cushion bead extending about the body in unbroken relation to said one end there- 60REIGN PA of, 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 wearer's 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 person's face; a 70 pp. 64, 65.

face engaging cushion bead comprising a soi 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 wearer's 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 wearer's face.

6. A respirator comprising a hollow body shaped to provide an enclosure for the nose and mouth of a wearer of the respirator, the inner edge of the body being resilient and formed with a channel. the defining walls of which channel tend to close together under the contractive action of the resilient material, a filter secured to the front end of the body and a second filter, such second filter being of soft porous material having a surface portion thereof removably pinched between the resilient walls of the channel.

WERNER LEHMANN.

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 2.035,097 Schwartz ----------Mar. 24, 1921 2,055,853 Schwartz ---------- Sept. 29, 1936 2,367,367 Olson ----------- Jan. 16, 1945 F N 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),