Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS521939 A
Publication typeGrant
Publication dateJun 26, 1894
Filing dateOct 23, 1893
Publication numberUS 521939 A, US 521939A, US-A-521939, US521939 A, US521939A
InventorsGustave Pozdena
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 521939 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

2 N A R U H C v & A N B D Z 0 P G (No Model.)


No. 521,939. Pafented June 26, 1894.

a W a h THE NATIONAL umomumma COMPANY.

(No mam. 2 sham-sheet 2.



No. 521,939. Patented June-26, 1894.

To all whom it may concern:




SPECIFICATION forming part of Letters Patent No. 521,939, dated June 26, 1894.

Application filed October 23, 1893. Serial No. 488,969. (No specimens.)

Be it known that we, GUSTAVE POZDENA and FRANK GHURAN, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certaln new and useful Improvements in Respirators, of which the following is a full, clear, and exact description, that will enable others to make and use the same, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to improvements in that class of devices set forth in United States .Letters Patent, No. 476,486, dated June 7, 1892.

The object of, the present invention is to provide an improved attachment for respirators in the form of a hood-covering toprotect the head and neck of the wearer when exposed to fire, and is especially intended for the use of firemen. A valve attachment also provides for the admission of an additional volume of air.

Figure 1 is a front elevation of adevice embodying our improved features. Fig. 2 is a broken-away inverted perspective bottom View; and Fig. 3, a rear elevation.

The interior construction of the respirator proper is the same as that set forth in the patent herein referred to; a detail description will therefore be omitted.

In the drawings, A is a casing or chambered body, inclosing air-passages, which will ordi- ,narily be of the form or contour shown. This casingmay be constructed of any suitable material, metallic or otherwise, and is provided in its respective ends with perforated doors B, hinged as at a, through which the air is admitted and expelled in the process of respiration. The hood or head-covering C will ordinarily be manufactured of asbestos cloth, however, any other fire-proof fabric, suitable for the purpose, may be used. The respirator and hood are neatly joined together,

' as shown in Fig.1. The opposite inner side (Fig. 3.) is provided with the mouth and noseopening or recess D. This opening is bordered by an elastic cushion b. The contour of this border corresponds to the form of the face so as to be close-fitting and air-tight, and at the same time to present a soft, yielding surface that will be comfortable to the wearer.

The device is secured to the head by means of two loop-straps d d, having their respective ends secured to the upper and under side of the respirator, as at (1', (Figs. 1 and 2) and the neck-band E, connected at their front ends to the loop-straps, as at 01*, and the rear ends joined by a buckle. d The goggles F are socured to the hood in such a manner as to be a permanent part thereof, so that When the hood is placed on the head the goggles are in proper position without additional attention. The transparent parts 9 are ordinarily composed of mica. The air-valve G is inserted in the vunder side (Fig. 2) of the respirator and opens into the respiratory chamber, as shown at h, Fig. 3. This valve is manipulated by hand, and is an auxiliary attachment, to be.

used as circumstances may require, for the purpose of inhaling a greater volume of air than that supplied through the ends of the respirator. By this arrangement a device 1s provided that is easily and quickly adjusted to the head, and will enable the wearer to remain in a heated and smoke-charged atmosphere for some considerable time without injury or inconvenience.

Having thus described our invention, what we claim, and desire to secure by Letters Patent, is-

The combination with a respirator, having air-passages therethrough from each end and provided in the rear side with a respiratory chamber, of an air-valve, inserted in said respirator and communicating with said chamber, and a hood-attachment, as described, inclosing the respiratory-chamber, but havlng the air-valve exterior thereto, substantially

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3789839 *Jun 27, 1972Feb 5, 1974CivilforsvarsstyrelsenCovering for protecting head and face from dangerous aerosols and gases
US4625721 *Nov 7, 1983Dec 2, 1986Lockheed CorporationSmoke mask
Cooperative ClassificationA62B9/02