Protective cover for breathing apparatus

Application filed November 30, 1925, Serial No. 72,144, and in Germany December 1, 1924.

\ This invention relates. to. breathing apparatus, and more particularly to a. protective cover.for such apparatus or parts thereof.

A protective cover or shield for breathing 5 apparatus or parts thereof has the dual function of not only protecting the apparatus covered but also ventilating and cooling such apparatus by permitting atmospheric or external air to pass through the 19 said cover and to flow around said apparatus.

It has been proposed to use protective covers or shields which are either perforated or punched, i. e. provided with slits or op15 enings as in grids or lattice-work. The disadvantage of these covers is that they permit cooling and ventilation of the apparatus at the expense of the protective effect against external injuries. This loss of pro29 tective effect means that parts of the apparatus are exposed to . external agents.. For instance, in the case of a nail protruding from timber work, or a sharp point of a stone projecting from a mine wall, it is possible 25 that the sharp end of either the nail or the stone may pass through one of the apertures of the protective cover, and injure or puncture parts of the apparatus adjacent to said cover.

The object of this invention is not only to eliminate the disadvantages of known types of protective covers, but also to provide advantages which will be pointed out hereinafter.

Generally speaking, the improved protective cover or shield embodying my invention provides an arrangement of ventilating or cooling apertures such that a, sharp pointed object cannot penetrate into the interior of .40 the apparatus. This protection is effected by disposing the metal or material forming the said cover so that the cooling apertures are transverse to said cover, and that a substantially blank wall protects the said apparatus 45 or parts thereof. Consequently, sharp objects merely strike this blank protecting wall without penetrating the apertures and causing any injury to the internal apparatus.

The invention will be best understood from so the following description of several illustrative examples thereof taken in conjunction with the accompanying drawings forming a part of this specification, and, in which:—

Fig. 1 shows a rear elevation of an embodies ment of this invention in the form of a hinged , cover adapted: to protect the: car-. . fridge or filter , of' a breathing apparatus;

_: Fig. 2 is a sectional view taken on the line , 2—2 of Fig. 1;

Fig. 3 is an enlarged .view of a! part of the GO cover.shown in Fig.1;

. . Fig. .4 shows a vertical section taken on line 4--.4 of Fig. 3; ..

Fig. 5 shows a horizontal section taken on . line 5—5 of Fig. 3; _: 65

Fig. 6 is a view similar to that of Fig. 3 showing a modified form;

Fig. 7 is a vertical section .taken on the line 7-—7 of Fig. 6;

Fig. 8 is a horizontal section taken on the 70 : line 8—8 of Fig. 6.

Similar, characters. of reference designate similar parts in each of the several views.

The reference character c, as shown in Figs. 1 and 2, designates a hinged-cover 75 which is made from a piece of suitable sheet material, such as sheet metal, and is adapted : to be fastened to a breathing apparatus to protect the cartridge filter. The main body a of said cover is provided with a pair of ⁸⁰hinges or fastening means H and a plurality of parallel cuts <3/ arranged in rows a⁴ and a⁵. In the drawing seven of these rows are shown, but obviously any suitable . number of rows with any desirable distance therebe- ⁸⁵tween may be employed depending upon: the . particular conditions. The alternate portions of metal between adjacent cuts are bulged into projections, a² which form, with : the rest of the sheet, apertures or openings 90 a^s transverse to. said cover. These projections may have: any desirable shape such as an arched section or a rectangular section, the arched section being shown in Figure 4... The strip or portion, of metal a^e between 95 said projections remains in the plane of the metal sheet a. In the illustration in Fig. 1, the projections in alternate rows are staggered, i. e. the projections «² in rows, a⁵, are in line with strips a⁵ in rows a⁴, and si mi- 100 larly the projections a² in rows a⁴ are in line with strips ®⁶ in rows a⁴. . .

If a sharp object strikes the aforesaid protective cover, the point of said object striking either the projections a² or the rest of 105 the metal cover will be prevented from penetrating to the apparatus and injuring the part to be protected. It is apparent that my improved protective cover provides a plurality of transverse apertures which serve HO

CT 1,68 as cooling or ventilatiiig openings, and a substantially blank wall which protects the parts covered thereby. In case it is desired ' to increase the ventilating or cooling effect, 5 the transverse openings may be enlarged by further vaulting or arching the edges a of the projections a?.

In the form shown in Fig. 6, the transverse apertures have been made still greater 10 by bulging the intermediate strips a^s inwardly to form projections :®³. The transverse apertures a⁸ formed by the said projections a² and a³ may be clearly seen in Fig. 7. By this arrangement, the area of the ¹⁵ transverse apertures is practically doubled, and the ventilation afforded thereby greatly improved. It is to be noted that this type of cover’ provides increased ventilation to the covered part of the apparatus without di

5,545 minishing or detracting from the protective 20 effect to said apparatus.

While I have illustrated and described preferred forms of construction for carrying my invention into effect, it is understood that variations in embodiments may be made 25 without departing from the scope and spirit of the invention.