US 1410928 A
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APPL!C/\T!0N FILED MAY22L1920.
Patented Mar. 28, 1922.
2 SHEETS-SHEET I.
J. w. KNOBLOCK.
APPLICAHON FILED MAY 22. 1920.
Patented Mar. 28, 1922.
2 SHEETSSHEET 2.
UNITED STATES rivrlazu'r OFFICE.
JAMES w. KNOBLOOK, or ELMIRA, NEW YORK, .essmuon. 'ro Amman- LA rmmm rmn ENGINE (10., mm, oF ELMmA, NEW YORK, A CORPORATION OF NEW YORK.
T all whom it may concern Be it known that I, JAMES KNOBLOCK, a citizen of the United States, residing at Elmira, county of Chemung, and State of New York, have invented certain new and useful Improvements in Respirators, of which the following is a specification.
The present invention relates to'improvements in the type of respirators for filtering dustsand li ht fumes from air of the type in which the filtering medium .is a dampened sponge or a filtering paper. The maln purpose of the present inventionis to produce a more efficient respirator of the type refront wall of the respirator body.
ferred to, by providing an extra-large filter area that will produce eflicient filtration with the least breathing resistance, and a device in which the dead air or rebreathing space inside the respirator is reduced to the least possible percentage of a normal breath.
In accomplishingthese results the respirator of the present application comprises a cup shaped metal body, carefully designed to conform to the contour of the human face and having a soft rubber air cushion, which assures a tight fit with least possible pressure on the face, and a relatively large filter box,
containing either a sponge .or paper filter material, and freely communicating with the respirator body through a large opening. The filter box is formed preferably by a flattened cylindrical container having a circular opening formed in its rear wall and the 'metal surrounding this opening turned over or flanged into a similar openin in tlhe t is means the respirator body and filter bo x are permanently secured together. The attachment of thes two parts ismade more rigid by means of rivets passing through their adjacent walls near said communicating opening. The filter box is so arranged with reference to the respirator body that a pocket or trap is formed in the filter box below the opening communicating with the respirator body, so that any excess moisture collecting upon the filter sponge or paper from the breath of the wearer will gravitate to the bottom of the filter box and be kept out of the respirator body and away from the face of the wearer.
with reference to the accompanying draw:
' Specification of Letters Patent. Pa tgnfl ed Ma 28. 1922 Application filed May 22,
1920. serial no. 383,549.
ings and afterward pointed out more 'particularly in the annexed claim.
- In said drawings: a
Fig. 1 is a side elevation of the improved respirator, indicating by dotted lines the position of the wearers head in the respirator, and also showing in dotted lines a flexible respirator hood that can be worn with the respirator.
2 is an external front view of the respirator.
Fig. 3 is a vertical longitudinal sectional view of the same taken on the line 3-3 of Fig. 4.
Fig. 4 is a'transverse sectional on the line 4.4 of Fig. 3.
Fig. 5 is a view similar to Fig} 3 of a slightly modified form showing the use of the paper filter.
Fig. 6- is a view similar to Fig. 2 of the paper filter form of respirator. I
The improved respirator is formed-with a respirator body 1 of metal, preferably such as aluminum, carefully designed to fit over the mouth and nose of the wearer. This cup 'shaped'metal body 1 is conformed as closely as \possible to the contour of the face so as to reduce to a minimum the free space between the respirator body'and the wearer when it is in use.
The shaped edge of the body 1 has mounted upon it, in the usual manner, an inflatable soft rubber cushion 5, which fits tightly against the face of the wearer Withview taken out undue pressure. The air cushion can be.
inflated more or less to accurately adjust itself to different profiles. An elastic band indicated at 10 is riveted at 11 to the respirator bod in position to be passed around the head 0 the wearer, and rovided with a fastening buckle or a simi ar device for adjustably securing it in place.
In Figures 1, 2, 3 and 4, 15 is a circular cup. or, box formed with a' central opening 16, having the metal of its. ack wall passed through a similar 0 ening formed in front of the respirator body 1 and turned over or upset therein for permanently securing the box 15 to the body portion 1. This attachment is made 'more secure by means of a -rivet 17 passed through the adjacent walls of respirator body 1 and filter box 15, said motion. A felt washer or ring of packing material 19 is cor-fined between the filter box and respirator body. The box is designed to support a filter sponge 20 which is en aged upon its outersurface by a circular s eet of'metal gauze 21, held in place by a flanged cover; ring 22, which is attached to the filter box by any suitable means.
It will be observed that the filter box presents a relatively large filtering area, and that the opening from the filter box to the respirator body is a large unrestricted assage for the free movement of air caused y the breathing of the wearer. The lower portion ofthe box presents a trap to collect any excess moisture from the moistened filtering sponge, particularly from the accumulation of moisture from the breathof the wearer. This arrangement prevents of filter paper indicated at 31.
moisture from entering the respirator body pro r and keeps it away from the face oft ewearer As shown in rator may be combined with any of the well known forms of cloth respirator hoods,
' and cover the mouthvand nose, said body such as indicated bydotted lines 25.
InFigs. 5 and 6, the improved respirator is shown with a slightly modified form of filter box. The mam difference in this form from the sponge type of respirator just described, isthe provision of a somewhat flatterfilter box 30 of relatively larger diameter, arranged to receive several layers- A strip of Wire gauze 32 is slightly arched over the opening 33 leading to the respirator body 1, to hold the filter paper awa from said opening to increase the availa le filtering surface and improve the freedom of the cir' culation of air. The filter box 30 is secured to the respirator body 1 in the same manner as above explained, excepting there ance.
Fig. 1, the improved respiare two rivets 34 passing through the walls of the respirator body and filter box. The layers of filter paper are retained in. the filter box 30 by means of a sheet of wire gauze 35, a flanged retaining rin 36 and some form of securing device, sue for example as the detachable spring clasp indicated at 37.
With the improved respirator above described, whether of the sponge or paper filter type, the dead air or rebreathing space inside the respirator bod contains less than 4% of a normal breath andthe extra large filterarea assures efiicient filtration with the least possible breathing resist- No valves are necessary and there are no working parts to get out of order because of these two important features. The moisture trap in the filter box adds, to the efii- .ciency and comfort of the respirator.
bein formed with an air inlet opening in its ront wall, a circular filterbox having an air opening centrally of its rear wall, a
flange formed integrally with the rear wall of said filter box and surrounding the air opening therein, said flange being adapted to be projected through the air inlet opening of the respirator body and bent back against said respirator body for securing said filter box thereto, said air openings being'in free communication, thereby forming a bafile and tra to exclude moisture from the respirator body, a filter material in said filter box and means for attaching to the wearer.