US2272001A - Protective face shield for masks - Google Patents

Description

Feb. 3, 1942.

IH. GooDE, sR

PROTECTIVE FACE SHIELD FOR MASKS Filed Dec. 19, 1939 o o/. o

Patented Feb.v 1942 k i UNITED `STATE PRoTEcTIvE FACE SHIELD Fon MASKs Hendrik Goode, Sr., Rotterdam,'Netherlands Application December. 19,.v1939,-Seral No.` 310,090 In the Netherlands'January 19, 1939 1 1 Claim.

This invention relates to a mask or shield for protecting the face and eyes of workmen engaged in dangerous operations, vas for instance electric Welding- It has heretofore been proposedtoprovide such o protecting masks with a'peep hole or inspection aperture adapted fto be closed by a protective pane 4which ishinged infront of the said aperture and is turned in forward and upwarddirection by a pair of bellows through the intermediary of a lever system, when the workman blows `into an air duct connected to the pair of bellows,

in order to uncover they sight aperture. Under some circumstances the hinged protective pane,` which. projects from the front wall of the,` mask,

'may be of great inconvenience during' welding;

Moreover the known devices presenty the disadvantage that the air pressure effects the movements of the protective pane with the faid' of levers, which not only involves a more complicated construction, but-'also' causes a considerableretardation in'theclosing movement of the protective pane. This means a great drawback, when the mask is used in electric welding opera-I tions, since it isA ofthe utmost importance to watch the parts to be welded together with unprotected eyes as long as possible, i. e. until forj v mation of the electricvarc. j

One of the primary objects of thisinvention is to obviate the above mentioned drawbacks of the known devices and to obtain a protecting mask of very simple construction and easy in use.

A further object of this invention is to obtain. a vvery fast and sudden displacement ofany vde-i sired stroke-length of the protective pane only with a small'diierence .in pressure. Astill further object is to avoidthefnecessity .to Akeep the air duct of the blowing device closed, either by the tongue ofthe Workman.k or by a special nonreturn valve, when the protective paneis" in its uppermost-or normal position, in order to prevent the lowering of said pane.

In the drawing: v

Thefigure represents a front view, partially in section, of my improved mask.v

Referring to the drawing, VI 'indicates a'guide frame fixed to a vmask (not shown) and 3 apane operatively mounted in the frame and supported on the upper end of a tube 9, the lower end of which ts in the upper endV of a chamber I0, the

lower end of said section is; reduced andopen to communicate with a` exible tube I6. 1The5 `vent openings I'I.

uppersection Irisprovided atits lower end I with an outwardly extended ilange'- I2' to cooperate with the flange IIa, on the upper end of section I I, for a purpose to= bedescrbed. j The upper end of section I0a 'is reducedandiis open` for the reception .of vthe tube 9` and is also', provided; with Within the chamber` It]V and secured to the tube 9` is adiaphragm I4. The edge of the diaphragm is reinforced as at I5 and fits around` the flange l I Ia of lower chamber section VI I. The flange I2 of the upper chamber section '|09 fits' over the edge of the diaphragm andv clamps the diaphragm over the ange I2. `Suitable means are v provided to secure the twoI sections I0?L andy II f andthe diaphragm in clampingrelation.`

. The-diaphragm vis of elongated form when inY normal position and is of such thickness to sustain the weight of the 'pane' andsupporting tube in the extended upward'positio'n, f

Whenit is desiredto lower theprotective pane Vto its active: lowermost position, the `workmany 'sucks at Ythefree end of `the exible tube I6.`

Consequentlythe air pressure ingthe lower section II of the'diaphragm chamber is reduced and pulls the kdiaphragm down. The flatter lisV passed beyond'its centre position and quickly reaches reduction'of `air pressure `ingthe space above they y ydiaphragm. III,y which would counteract the movementy -of the diaphragm, lthe apertures I'I fare the upper vpart lIII of the providedi in the walls of chamber. i y

y 'To return. thexprotective. pane to its inactive' position, the workman'k blows into the tube I6.

The diaphragm 4is then forced inits uppermost latter being formed of two sections I 0a and II.

position. The wearer vof the maskl need notnec- `essarilyclose f the end, of the tube I6 with his tongue, since the diaphragm I4 Ais so made to y carry the yweight of the tube 9, andthe glass 3.

, The device v'justdescribe'd is ofA very simple construction. No pressure losses canjarise.V Opening-and shutting'lo'f the `sight aperture ,2 are ef-V fected immediately, which is of great importance s in .electric welding. The shape'of the diaphragm assures.: aI largef stroke-length. n, Since the diaphragm chamber is made; in twopartspthediaphragm, if necessary,` mayv be''easi1y removed and j replaced b y. another'one. r f

What` I claim is:

A protecting face shield for kmasks, includingav protective pane slidably arranged along an apen, 4

ture in the mask proper and directly coupled to protective pane in the said extreme positions an elastic diaphragm mounted Within a chamber which define the stroke-length of the movements and taking in unstrained condition a position on of the protective pane, one side of the diaphragm the one side or the other of a centre position and chamber being adapted to be coupled to a blowthereby presenting in section an oblong bell 5 ing duct.

shape, said diaphragm being able to carry the HENDRIK GOODE, SR.

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