Surgery – Respiratory method or device – Including body or head supported means covering user's scalp
Patent
1994-07-06
1995-07-11
Burr, Edgar S.
Surgery
Respiratory method or device
Including body or head supported means covering user's scalp
2 9, 12820125, A62B 1800
Patent
active
054311560
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a protective respiratory device in the form of a half-mask designed to cover the nose and the mouth of the wearer and combined with a hood designed to enclose the head of the wearer and provided with a visor in front.
It is essential to the function of such protective respiratory devices, as well as devices without a hood, that the mask, whether a full-face mask or a half-mask, is applied in a tight-fitting fashion to the face of the wearer. To this end, protective respiratory devices are usually equipped with elastic and length-adjustable bands, more specifically a first band extending from the two sides of the mask round the nape of the neck of the wearer, a second band extending from the two sides of the mask round the back of the head, and, in the case of a full-face mask, a third band extending from an upper portion of the mask rearwards over the crown of the head to be connected to at least one of the other two bands.
It is true that the elasticity and the adjustability in length of the bands make it possible to adapt a protective respiratory device to fit each particular wearer. However, such adaptation is time-consuming and should preferably be done well in time before use, i.e. not when an emergency arises, which may make people panic, yet necessitating quick application of the device. Especially, this goes for so-called escape hoods, which are intended to be used in the event of a gas emission or a fire and which are a combination of a half-mask covering the nose and the mouth of the wearer, and a hood enclosing the head of the wearer, since the bands for keeping the half-mask in place are often so arranged under the hood as to be difficult of access. Also, prior-art protective respiratory devices often require some readjustment of the length of the bands or their position round the head to be completely tight.
SUMMARY OF THE INVENTION
In view of the deficiencies of prior-art protective respiratory devices, an object of the present invention is to provide a protective respiratory device of the type mentioned by way of introduction, which does not require any adjustment of the band length, neither before nor after application of the mask, and which further does not require any readjustment of the position of the bands round the head by virtue of an ingenious arrangement of the bands.
This object is achieved by a protective respiratory device which is characterised by a first elastic band provided inside the hood and extending between the two sides of the half-mask to be applied round the back of the head or the nape of the neck of the wearer, and a second elastic band which is provided inside the hood and fixed therein in front and at the back and which extends rearwards from a portion of the hood corresponding to the forehead of the wearer and is connected to the first band, the second band being made of a soft elastic ribbon material and intended to be placed over the crown of the head of the wearer and having such a width as then to surround the head of the wearer to a large extent also laterally, the hood being, round the bag opening, provided with an elastic sleeve designed to surround the neck of the wearer in a tight-fitting fashion.
Thanks to the combination of a first elastic band extending preferably round the nape of the neck, and an exceptionally broad second elastic band extending straight back over the crown of the head, the protective respiratory device according to the invention is extremely easy to put on. Thus, after pressing the mask against the face, one merely has to pull the junction of the two bands back over the head to position the bands. The length of the bands need not be adjusted, primarily because the large width of the second band makes it possible to choose a very soft elastic ribbon material for this band and still achieve the forces required for fixing the mask in place, both vertically and laterally.
BRIEF DESCRIPTION OF THE DRAWING
A preferred embodiment of the invention will be described in more
REFERENCES:
patent: H1316 (1994-06-01), McGuinness
patent: 2821192 (1958-06-01), Monro
patent: 4506667 (1985-03-01), Ansite
patent: 4595003 (1986-06-01), Shoemaker et al.
Burr Edgar S.
Srivastava V.
Sundstrom Safety AB
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