US2264829A - Respirator - Google Patents

Description

2 Sheets-Sheet 1 H. S. COVER RESPIRATOR Filed May 27, 1936 174/' mfg Q2-fel; i??

, Dec. 2, 1941.

Dec. 2, 1941. H. s. covER 2,264,829

RESPIRATOR l l Filed May 27, 195e 2 sheets-sheet 2 Patented Dec. 2, 1941 UNiTED STATES PATENT OFFICE aEsPmAToa Harvey S. Cover, South Bend, Ind. Application May 27,1936, serial No. 81,988v

8 Claims.

This invention relates to improvements in respirators. It has for an object the production of an improved device to be used for protecting the user from impure air of various kinds.

One of the objects of the invention is to provide a simple, practical, and efficient respirator of the character described, having a large area for filtering and adapted for easy breathing and adapted also to dispense with the use of any special exhalation valve.

There has long been need of a respiration which is efficient yet inexpensive for ltering out silica, asbestos, and other minute dusts. For example, there has long been need of such a respirator by farmers for use in putting up hay, fanning out oats, plowing and cultivating, and dragging in dusty weather, and by coal dealers in handling coal, dairy men in cleaning stables, painters in spraying paint, by the populations of dust storm areas, and by persons of other areas and occupations.

The respirator of the present invention was particularly designed to provide an inexpensive, eflicient respirator to meet such problems as these and has been found by actual test to be completely successful.

I have eliminated the special exhaust valve completely, and by the design of the large area for filtering exhalation is successfully handled through the large area inhalation pads. By the construction which I have arranged there is very little air spaceonly enough to allow the air to collect for one or two breaths, and very little air is breathed over. There is just enough space to let the air flow in from all parts of the lter.

Another of the objects of the present invention is to provide a simple, practical and erlicient respirator with a new and novel method of holding the filter element in proper spaced relation with the lter plate or filter holder and to properly position the pad, and also to prevent the pads from slipping upon each other where a number of pads are used.

Another object is to provide a light weight respirator adapted to permit good vision.

A further object is to provide a device of the character described which is comfortable and posseses high eiciency in accomplishing the objects stated.

A still further object is to provide a respirator having a more readily removable lter pad and a device which is simple and which may be cleaned easily.

An additional object is to provide a respirator wherein there is increased area of the filter pad available for filtering purposes.

Other objects and advantages will become apparent and be brought out more fully in the following specification, reference being had Vto the accompanying drawings, wherein:

Fig. 1 is a side view of the preferred form of the device of the present invention, partly broken away;

Fig. 2 is a plan section taken on the line 2-2 of Fig. 1;

Fig. 3 is an elevational sectional view taken on the line 3-3 of Fig. 2;

Fig. 4 is an exploded View in section of one of the filtering elements and its connecting means to the body of the respirator; and

Fig. 5 is a plan View of a modified form of respirator, partly broken away.

Referring more particularly to the drawings and especially to Figs. 1 4, in which I have shown the preferred form of my invention selected for purposes of illustrating the principle thereof, I show a respirator having the body portion vII! provided with cut-outs II at the top Yandbottom to accommodate the nose and lower part of the face of a wearer. The body I0 has a right wall I2 and a left wall I3 as seen by an observer on the face of a wearer, and each of the walls I2 and I3 has a circular aperture I4 clearly shown in Figs. 2 and 4. Cemented to the body portion I0 is a pair ofy strap sections I5 and I6. These strap sections are adapted to be adjustably and frictionally locked together by a locking plate I'I clearly shown in Fig. 2, as will be manifest without further description. These straps may be made of any suitable material and in the formV shown they are made of the same kind of rubber as the body. Y

Each of the side walls I2'and I3 of the body portion I0 is adapted to be united to a lter holder I8, there being one lter holder for each wall. Each lter holder I8, clearly shown in all the gures, is provided with an aperture I9, as clearly illustrated in Figs. 2 and 4. A descriptionof the application of one of the filter holders I8 to the right wall I2 will serve to illustrate how a lter holder I8 is applied to each of the walls I2 and I3, the same manner being used in each.

For example, a filter holder I 8 is secured to the right wall I2 by a flanged tubular locking member 20, as clearly shown in Fig. 2 especially, Fig. 4 showing the flanged tubular locking member 20 Ybefore it is given its nal bending operation for locking, that is, before assembly. The

member 20 has a circularly corrugated ange 2I and a flange 22 as shown in Fig. 2, and these iianges 2| and 22 which are substantially parallel serve to lock between them a circular spacing member 23 and the filter holder and the right wall I2, as clearly shown in Fig. 2 and in the exploded view, Fig. 4. The circular spacing member 23 is provided with an aperture 24 and spacing legs 25 with angularly bent portions 26, the legs 25 leaving pockets for the transmission of air and being so spaced as not to interfere with the positioning of the filter pad as will be more evident hereinafter. This spacing member 23 is clearly shown in Figs. 2 and 4.

As will be seen clearly in Fig. 4, in assembling the device the aperture I4 of the right wall I2. is positioned so as to register with the aperture I9 of the filter holder I8, and both` of these `apertures I4 and I9 register in turn with the aperture 24 of the spacing member 23. When these three apertures I4, I9, and 24 are in registry, the flanged tubular locking member 20 may have its tubular portion inserted through the three apertures I4, I9, and 24, after which the tubular portion of the member 2l] may be bent to form the fiange 22, as clearly shown in Fig. 2, to lock the right wall I2, filter holder I8, and the circular spacing member 23 properly together.

The filter holder I8 has a fiat base 21 and a web 28, shown in Fig. 2, which is concave'as seen looking at Fig. 1, and also has a right angled flange 29, clearly shown in Figs. 2 and 4, the base 21 and the web 28 and the fiange 29 combining to form a pocket 30. The filter holder I8 also has an aperture 3I in which is adapted to be inserted, in the form shown in Figs. 1-4, a pair of disks or pads of filter material 32 and 33. The pad of filter material 32 may consist of any fibrous or other well-known material which serves to filter air. In the form shown, two pads are used, the pad 32 being of a relatively coarse fibrous filtering material and the padl 33 being of a relatively fine fibrous material, and the pad 33 will give an even better filtering action, sifting out any fine dust that might have been admitted through the pad 32. The pads substantially fill the pocket 30. Each of the pads 32 and 33 in the form shown is provided with an aperture 34 located centrally thereof, and extending through the apertures which register with each other is a fillistei head screw 35 having a nut 36. The screw extends through the apertures 34 of the pads 32 and 33 and sufiiciently beyond the pads and the nut 36 on the other side to space the pads from the base 21 so as to create an air chamber only sufficiently large enough to permit the air fiow. The screw 35 and the nut 3S also function to position the pads 32 and 33 so that there will be no slipping action between the pads and so that they will be exactly in registry with each other and alsoin order that the peripheral edges of the pads will be properly positioned in relation to the pocket 39 of the filter holder IB.

It will be seen that the circular spacing member 23 by means of the spacing legs 25 with the angularly bent portions 26 servesv to space the pad 33 from the flat base 21 so as to create an air chamber sufficient to allow the air to collect and flow and also the legs, in the form shown, being three in number, are positioned so as to allow substantial spaces between the legs to a1- low the air to fiow with the desired freedom.

It will be understood that the left wall is similaily provided with a filter holder and pads, spacing member and locking element, and it will be seen that air may be drawn in through the outer pad 32 and then through the relatively finer filtering pad 33 and thence between the spacing legs 25, through the aperture 24 of the spacing member 23, and thence through the aperture I9 of the lter holder I 8 and thence through the aperture I4 of the right wall I2 into the nostrils. It will be manifest that the angularly turned portions or shelves 26 function to effectively space the filter pad, whereas if such portions were not provided, the material of the filter pad might crowd or work down about the leg 25 and not be properly spaced. It will also be manifest that I have in the form shown so arranged the legs 25, as clearly seen in Fig. 1, that there is no leg immediately adjacent the pocket 30. In this way there is nothing to invterfere with the proper positioning of the pads 32 and 33 in the pocket 3D.

In Fig. 5 I have shown another modification and concrete exempliiication to illustrate the principle of my invention, and this form is the same as the form shown in Figs. 1-4, excepting that only one pad 38 is shown instead of the two pads 32 and 33 shown in the other form. Either one pad or a plurality of pads may be used. It will be seen that the pad or pads may be tucked into the pocket 30 of the holder 28 and because of the right angle flange 29 and the insurance against slipping between pads where a plurality of pads is used air will not be able to work around the peripheral edges of the pads adjacent the web of the filter holder.

While I have illustrated and described the preferred form of construction for carrying my invention intoeffect, this is capable of variation and modication without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a respirator, a filter holder, a plurality of filtering pads located in said filter holder, a spacing and positioning member whose point of support is located in said pads and adapted to properly positionv said pads in said filter holder both with respect to each other and with respect to the filter holder, and adapted also to space pads from said filter holder.

2. In a respirator, a lter holder, a plurality 1 of filtering pads located in said filter holder, a

screw element located in said pads and adapted to properly position said pads in said filter holder both with respect to each other and respect to the filter holder, and adapted also to space pads from said filter holder.

3. In a respirator, a body portion having an inlet port and a filter comprising a plate provided with an aperture registering with said port and a filter pad over said aperture, said plate being imperforate except for said aperture, means for securing the edge of said filter pad to said plate and means on the filter pad at a distance from the periphery thereof for spacing said pad from the imperforate portion of the plate, substantially as described.

4. In a respirator, a body portion having an inlet port and a filter comprising a plate provided with an aperture registering with said port and a filter pad over said aperture, said plate being imperforate except for said' aperture, means for securing the edge of said lter pad to said plate, the surfaces of said lter pad being unobstructed except at the peripheral connecting edge and means on the filter pad at a distance from the periphery thereof for spacing said pad from the imperforate portion of the plate, substantially as described.

5. In a respirator, a body portion having an inlet port and a lter comprising a substantially plane base portion eccentrically mounted about said port, an outer filter element connected at the periphery to said base portion, and having its entire surface unobstructed, a spacing member carried by said lter element and impinging against said base to maintain the entire filter surface unobstructed by contact of the base and lter elements and to prevent restriction of the passageway from all portions of the filter surface to said port.

6. In a respirator, a body portion having an inlet port and a filter comprising a base portion having an eccentrically positioned port, a cylindrical tubular member extending through said ports and flanged at its ends to connect said body and filter base, a lter element connected at the periphery to said base portion, substantially centrally disposed means xed to said filter element and impinging against said base element to space the same from each other, a ring interposed between said base portion and the adjacent flange of the tubular member, and members struck up from said ring to prevent the filter element from contacting the base adjacent the port, substantially as described.

'1. In a respirator a body portion having an inlet port and a lter comprising a base portion provided with an aperture registering with said port, a lter pad arched over said base portion and attached thereto at the peripheral edge, and a spacing leg arranged adjacent said port and having an angularly bent portion to prevent the filter pad from collapsing over said port.

8. In a respirator a body portion having an inlet port and a lter comprising a base portion provided with an aperture registering with said port, a filter pad arched over said base portion and attached thereto at the peripheral edge, and a plurality of legs spaced about said inlet port and projecting toward the filter pad, the outer ends of said legs being bent inwardly to engage the pad to prevent the same collapsing over said port.

HARVEY S. COVER.

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