ioofgrandlodgeofohio.org buy cialis online Suiter Swantz IP takes a look back at past inventions and inventors with our Patent Of The Day.
On this day in 1954, Paul Charbonnel was granted U.S. Patent No. 2,671,445 for a GAS MASK AND HELMET.
The present invention has for its object the embodiment of a system adapted to protect against gases and noxious dust and it comprises, on the one hand, a mask enabling the easy breathing and a good visibility for the attendant and, on the other hand, a helmet designed so as to allow the easy wearing of said mask together with its accessories.
This application is a continuation of Serial No. 692,050, filed jointly by Paul Charbonnel and Robert Raymond Jegou on August 21, 1946.
The invention further refers to the embodiment of a system of the aforesaid type in which the user is handicapped neither by the wearing of the filtering means-or the respirable air container—nor by the duct connecting these filtering means—or this container—with the protecting mask.
The invention has also for object the execution of a mask that may be applied in an air-tight manner on the face of the wearer, without on this account calling for means liable to compress the neck and the carotid.
A further object of the invention is to execute a helmet allowing, on one hand, the wearing of the filtering means either on the back or above the head of the user and, on the other hand, the yielding ducts which connect the mask to the filtering means or the breathable air container, to pass through the very helmet.
Still another object of the invention is executing a mask which enables the wearer to use optical instruments like correcting glasses, without being embarrassed by said mask.
Still a further object of the invention is the execution of an exhaust valve enabling to breathe out easily, that insures a perfect tightness during inhaling, and allows easy transmitting of speech for instance by the use of a telephone.
The different objects mentioned above are covered in accordance with the invention:
By the fact that the mask is formed by a yielding peripheral part connected in a tight manner to a rigid face member shaped according to the form of the face, to which it comes very near, and said face member—made preferably of molded material—is adapted to come into contact with the face of the wearer at three points. only, namely: the forehead and both cheek-bones;
By the fact that the valve provided for the exhaust of used air has a great diameter (superior to half the distance separating the nose from the chin), is of great suppleness and is arranged so as to form a diaphragm for transmitting sounds;
By the fact that the helmet adapted to be worn with the mask is provided with a recess for the yielding duct connecting the mask with the filtering capsule and the latter may in an advantageous form of execution be located above the head of the wearer where it is fixed in a detachable way, for instance by means of a bayonet joint, to the securing straps of the mask and fits freely in a recess of said helmet; the wearer may thus remove the helmet while keeping on to use the actual breathing device.
The system moreover includes a box for carrying the mask and its auxiliaries, and said box is shaped so as to be easily adapted on the upper part of the back of the wearer.
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