Inflatable head harness with hearing device placement
First Claim
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1. Fast donning breathing apparatus, comprising:
- a mask provided with a regulator arranged for connection to a source of pressurized breathable gas; and
a harness having at least one stretchable strap whose ends are attached on the mask and including an inflatable element, andmeans connectable to a source of pressurized breathable gas and manually controllable to admit a pressurized breathable gas to the inflatable element to extend said stretchable strap up to a large size and to discharge said pressurized breathable gas from said inflatable element to decrease the size of said stretchable strap and to enable the strap to tighten and to bias the mask onto a face of wearer; and
at least one ear piece secured to the harness or to the mask by means arranged for applying it against the auditory track or around the ear with a sufficient pressure for correct hearing, when the harness straps are deflated.
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Abstract
A respiratory protection apparatus has a breathing mask with a regulator and a fast donning harness having at least a pair of extensible strap whose ends are connected to the mask. Each strap has an element which is inflatable by the pressurized breathable gas for extending the strap until it has a sufficient size for enabling the user to quickly don the harness over the head and deflatable to permit the strap to tighten, to urge the mask against the face and to maintain the mask on the face. An ear piece is connected to the harness or mask and is applied against the ear when the harness straps are deflated.
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Citations
8 Claims
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1. Fast donning breathing apparatus, comprising:
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a mask provided with a regulator arranged for connection to a source of pressurized breathable gas; and a harness having at least one stretchable strap whose ends are attached on the mask and including an inflatable element, and means connectable to a source of pressurized breathable gas and manually controllable to admit a pressurized breathable gas to the inflatable element to extend said stretchable strap up to a large size and to discharge said pressurized breathable gas from said inflatable element to decrease the size of said stretchable strap and to enable the strap to tighten and to bias the mask onto a face of wearer; and at least one ear piece secured to the harness or to the mask by means arranged for applying it against the auditory track or around the ear with a sufficient pressure for correct hearing, when the harness straps are deflated. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. Respiratory protection apparatus comprising:
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(a) a breathing mask with a regulator arranged for connection to a source of pressurized breathable gas; (b) a fast donning harness having a pair of extensible straps whose ends are connected to the mask and which each have an element which is inflatable by the pressurized gas for extending the harness until it has a sufficient size for enabling the user to quickly don the harness over the head and deflatable to permit the strap to tighten, to urge the mask against the face and to maintain the mask on the face and having a plurality of cords connecting the straps to limit the spacing thereof; and (c) at least one ear piece secured to one of said cords by means enabling said ear piece to be applied to the mask by means arranged for applying it against the auditory track or around the ear with a sufficient pressure for correct hearing, by the harness when said straps are deflated.
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Specification