US1127612A - Respiratory mask. - Google Patents

Description

.1: ES A. FURTAW, OF PHILADELPHIA, PENE'SYLVANIA.

'RESPIRATORY MASK.

anemia.

Application lerl January 21, 1914. Serial No. 813,352.

tion being to provide a mask which may be comfortably worn, and which will insure a' supply of pure dust filtered air, so that Work may b'e readily done'under trying conditions which now prove dangerous to workmen.

A. further object is to provide'a maskv of the character stated in which an improved arrangement of valves is provided, allowing free respiration and insuring an escape of air exhaled from the lungs, supplying fresh air for inhalation.

A. further object is to provide improved means for supplying air in a filtered condition either under normal atmospheric conditions or under pressure as desired.

With these and other objects in view, the invention consists in certainnovel `features of construction and combinations and arrangements ,of parts as will'be more-fully hereinafter described and pointed out in the claims.

'In the accompanying drawings: Figure 1 is a view in side elevation illustrating my improvements. Fig.,2 is a view in vertical longitudinal section through the mask. Fig.

3 is a fragmentary view in horizontal nsection on the line 3-3of Fig. 2. Fig. 4 1s a similar view in section on the line Ll-4 of lTig. 2, and Fig. 5 is a view in longitudinal section through the center of the'air filtering chamber taken on the line 5- 5 of Fig. 1, but omitting the hose connection.

' My improved mask- 1 is composed in the main of leather having a transparent sec*v tion 2, through which the user may readily observe the surroundings.V The mask l, or at least the face portion thereof, is outlined throughout its edge on its inner surface with relatively heavy felt 3 so as to snugly fit the face and render the mask substantially air tight.

Canvas sections Llare secured to the mask and are connected by suitable straps 5 at the back of the head to hold the mask in place'. The mask at its front is provided with a screenedroutlet 6 which is located at the outer Specification of Letters Patent.

pend of an inwardly projecting? tube 7, the

latter having its inner end located at en angle and provided with a flap valve 9 preferably of leather. This valve 9 is secured at Patentes reas, as

its upper edge, and isl free to swing in@ wardly, the inward movement of the 'valve limited by an internal flange 10 on the inner end of the tube 7 which serves to seat the valve y and prevent any entrance of air through the tube.

The tube. 7 and the screen 6 are secured to metal plates-11 and-12, and the latter are secu'red'to the leather oil' the mask by rivets 13,

the mask being cut out to accormnodate the parts, whisk iso course to be understood.

The llower er chin portion of the mask is' provided with an inlet nipple 14; having a flap valve 15 at its upper end, scanned to the bottoml portion of. thel mask as shown at i6 and free toy swing' upwardly to allinvl an entrace of air through the nipple.

17 represents an air filtering tank which is: preferably secured around the waist of the user by means of a strap-18. This air ltering tank is elongated and comprises,

telescopic sections 19 and 2O which clamp between them a sheet 21 of woven material. This sheet may be readily replaced by separating the sections.

The bottom of the lower telescoping section 2O is closed by a wire screen 22, and a nipple 23 is provided in the top of upper section 19 which is connected by a hose 24 withnipple 14, so that air which is drawn into the mask is drawn through the wire mesh screen 22, and through thesheet 21.

The screen 22 excludes the larger particles ofdust, while the sheet 21 holds back the smaller particles, and hence the air passing to the mask is thoroughly filtered.

At one end of the upper section 19 ot' tank 17, I provide an inlet 25 Vnormally closed by a plug 26. This inlet is adapted to be connected by a hose with-any air supply device, so that if desired, air under pressure may be supplied to the mask. 'i

By the arrangement of parts above described, if the pressure of air is excessive, and more than desired, it will escape past the valves 15 and 9, and through the screened outlet 6 and also will pass downward iy through the screened bottom 22 of tank 17.

In-operation, the air inhaled is drawn upwardly through the filtering tank 17 and hose. 24 ast valve 15. Air exhaled is forced outwar y past valve 9 through screened eieeeee e inhalation causes valve 9 to close and valve l5 @to lopen, and exhalaeion causes Valve l5 eociose ami vaive 9 to open. The valves therefore operate automaticay and eompei oui air Whieh has been exhaled eo escape and eiways permit, and in feet compei, ehe operator to oreath' fresh air coninuously 7 Ey reason 'of the arrangement o' parte above described, the user may breathe through the mouth or nose, or both, and the deviee wil operate, Withequal facility,

v Various -siight changes might be made in *ehe geneiai form and erianvement of parte desei'ibedwithout departing from my in'- venzion, and hence do not lmi myse to she precise details set orh, but consider myself at iberty o make sueh changes and altera'zioiis es fairly fail Within ehe spirii and, scope of the appended chime.

Having thus described my inventiomwhat daim es new and desire to seeuie by Letters Potent; is: y

l. A respiratory mask constructed to t the face and having a screened outlet in its opening 6.

A from, an inwardympojeeting tube comunm-y iiieeting Wich the outlet and having its inner end ein an angie te its longitudinal axis, e veve ai; the muet emi of ehe tube permitting the 'ow of ein outwercy through fe'ftu'be, Seidl mask having en iigle in iis lewe? emi, end e a@ valve permitting ehe Eme' ef aie into' the mask throiigh seid net, eeeeutieliy as cie/scribed.

, 2 A zfespiracory mask of e shape @o the ieeey and having elineg of soit meteriei' 1550 bear againstthe face, .means oe ehe mask for clamping the same efmmd the heed o the user, said mask having openings in ies from v and lower end, meia'l piaes secured te the inner and outer surfaces o the mask emi having a. screen therein located ever the opening in the :from of the mask, e'uoe se cured to the inner metal pieta and heaving its imieif end et en angle to 'its longitudinal exis, a Hap valve in the tube :normally eiosing the inner end of the tube, :m a, ep valve normay closing the opening in the heiem of the mask, substenizieiiy es described. l a

n testimony whereofl have sgiie my name to this specification in the presence o 4 two subscribing Witnesses,

CHARLES e.. ieeeiew.

Witnesses:

CHAS. E. Powe, M, E. Dimes.

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