US 1288856 A
Description (OCR text may contain errors)
APPLICATION HLED MAY a. 1918A Patented Dec. 24, 1918 Y l ,19 lNvENToR WITNESSES ATTO Fl N EY ETE@ grail PAEN `@Fhlil LEWIS FAHR, 0F EL PRTAL, CALIFORNIA.
To all who/1t it may Concern:
Be it known that l, Lnwrs FAHR, a citizen ot" the United States, residing at El Portal, in the county ot Mariposa and State of California, have invented certain new and uset'nl Improvements in Respirators, of which the following is a specification.
The primary purpose ot this invention is the provision of a respirator which insures a supply of pure air at all times and which will not t'oul by exhalation due to the passage otl the breath through the iltering ducts or passages.
One oiE the main features of the invention is the provision of a. quick escape for the eX- halatious and the provision whereby the incoming pure air is prevented from commingling withl the escaping air when expelled from the lungs during the process of respiration.
A further purpose ot' the invention is the provision of a mask having separate and independent inlets and outlets each being valve controlled so that when pure and tiltered air is taken into the lungs, the outlet is closed and when the air is expelled from the lungs, the inlet is closed and the outlet opened to provide a ready escape for the used air.
The invention consists of a` mask or face frame provided with valve controlled air inlets and outlets. A filtering appliance is conected with the air inlets of the mask and serves also vas means for securing the respirator when in position and novel connecting means between the several parts whereby they may be quickly assembled, disconnected or dismembercd.
The drawing illustrates a preferred embodiment of the invention, however, it is to be understood that in adapting the same to meet different conditions, various changes in the form, proportion, and minor details of construction may be resorted to Without departing` from the nature of the invention as claimed hereinafter.
Figure 1 is a perspective view of a respirator embodying the invention.
Fig. 2 is a sectional detail of the mask or face vframe on the line 2-2 of Fig. 1.
Fig. 3 is a central longitudinalsection of the connecting means between the mask and air lilter showing the valve for controlling the air inlet.
Fig. Ltis a detall View of the tube which 1s Specification of Letters Patent.
Application led May 8, 1918. Serial No. 233,315.
-tittcd to the nask or face frame and to which the air filtering device is coupled. Y,
Fig. 5 is a detail view of the valve for controlling` the air inlet.
Fig. is a modified form of ail' filter.
Fig. i' is a sectional detail on thc line 7 7 oi" Fig. 6.
Fig. 8 is a detail perspective view of the frame and valve for controlling the outlet of the respirator.
Correspondingr and like parts are referred to in all the views by like reference characters. n
The mask or face frame l may be of the usual form. such as generally provided in respirators and may be of any material or construction so asto secure a close fit against the facc. In the preferred constructiomthe mask or face frame is of such proportions as to cover a portion of the face only, such as the nose and mouth, the space being. of such proportions as to admit of free and unobstructed respiration. The mask is formed at opposite sides with projecting portions 2 which are chambered so as to receive tubes The chambers or openings formed in the projectingr portions Q open at their inner ends into the mask as indicated at 4 whereb The tubes 3 are secured in the openings or` chambers of the parts Q in any manner and, l
as shown, the inner ends of the tubes are formed with annular shoulders 5 which be' come embedded in the material of the mask and particularly is this the case when the mask is formed of soft rubberI which is the preferable material. Theinner ends of the tubes 3 are cut away upon one'side as indicated at 6 to register with the openings 4. A1 pin 7 is supported at its ends in the sides of the tube 3 and constitutes one element of the connectin means between the mask and the filtering eviee. f
A valve 8 is disposed within the inner end of the tube 3 and opens toward the mask so as to admit pure air when the same is drawn into the lungs. A cage 9 is secured Within the tube 8 and constitutes a seat for thevalve 8, the latter being normally held on its scat by means of a light spring 10. The valve 8 opens when air is drawn into` the lungs and automatically closes when the used vided with a chamber 11 which is formed vlbetween an outer portion of the mask and a partition 12, the latter having an opening ,in its upper portion in which is fitted a frame 13, said frame having an opening which is normally closed by a valve 14 which Aopens outwardly and closes inwardly. The
valve 14 is Aof the flap variety and is hinged ootherwise connected at its upper end to admit of its lower end swinging outwardly and inwardly. The valve 14 is normally closed and opens outwardly to provide an escape for the air` when. the latter 1s ex.-
.pelled from the lungs. The frame 13 and valve 14 are removable 'to admit of the parts 'v being cleaned and otherwise maintained in a perfectly sanitary condition.l
' The air filtering device comprises a casing 15 and a coill spring 16 within the casing andserves the dual purpose of holding the casing expanded and as a yieldable connection for holding the mask in position against the face. The 'casing 15 is of suitable fabric of a nature` tovpermit air vto pass therethrough and' which will arrest pai'- ticles of dust and other matter floatingin the air, thereby insuring pure air free from all dust and other particles being supplied for respiration. Tubes 'are provided at the ends of the filtering device and are adapted to make detachable connection with the tubes 3. The tubes 17 are connected -to the ends of the spring 16 and'casing 15 in y packingwasher 19 is mounted upon the tube any manner ,and are adapted to telescope within the tube 3 and make connection therewith. As shown most Clearly in Fig. 3,
' the end of each of the tubes 17 is provided [with opposed L-shaped slots 18 which co5/ operate with the pin' 7 to form the .weil
known bayonet connection whereby the tube 17 is held securely within the tube 3 when the filtering device is coupled to the mask. A.
17 and comes between the outerv end of the tube 3 and the fer-rule 20 which secures the end of the casing 15 to the enlarged portion of the tube 17. 4
In the modification shown' in Figs. 6 and assente with a pocket 21 which may -be of fabric of a nature to arrest dust orparticles iloatving in the airv By having the casing formed with a pocket as 21, the ilteringsurface is i', the casing l is provided in its length i enlarged, thereby insuring a free passage and a full supply of air under all conditions.
vrThe respirator is applied by fitting the mask to the lower portion of the face so as to cover the nose and mouth, the filtering glevice being passed over and around the head so as to hold the mask in position.v When airis drawn into the lungs, the valves 8 Open A and when the used air is expelled from the lungs, the Valves 8 close and the valve. l opens, thereby providing ready and quick escape for the exhalation. As the air is drawn into the lungs, the casing 15 receives a supply 0i air from the surrounding atmosphere, and air passing through the walls of 4the casing` into theinterior thereof and all dust and oating particles separated by the casing, hence onlypure is supplied for breathing. t is noted furthermore, that the used air exhaled from the lungs does not enter the supply, hence the supply chambers and passages are prevented from fabric easing inclosing the helical spring.
ln testimony whereof l alix my signature 1n presence of two witnesses.
A. B. BAKER, n F. H. GLADDEN.