EP0511593B1
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EP
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Panoramic protection mask for operating interventions in polluted environments
Assignee: DISPOSITIVI PROTEZIONE INDIVIDUALE - D.P.I. S.R.L.
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Filing: 1992-04-23
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Granted: 1996-10-16
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Expires: 2012-04-23
Abstract
No abstract record available.
Inventors
- 👤 Andrea Cristiani
- 👤 Baldassare Genova
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 03:14
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/02
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
263 words
A panoramic protection mask (1) for operating interventions in polluted environments, of the type comprising: - an annular sealing lip (2) arranged to exercise a tight seal around the user(3)'s face; - a connecting sleeve (5) exhibiting an inspiration opening (5b) designed to bring an air supply into communication with the inside of the mask (1), and an expiration opening (5a); - a transparent screen (4) sealingly connected to said annular lip (2) by its outer perimeter, realized with a substantially toroidal shape defined by an arc of a circle rotating through an angle of predetermined amplitude about a substantially vertical axis of rotation (10), said screen (4) extending by its upper edge (4a) as far as the top of the user's forehead while the lower edge (4b) thereof extends as far as under the user's chin, characterized in that the distance of said upper edge (4a) from said axis of rotation (10) is greater than the distance therefrom of the lower edge (4b), the angle of inclination (α) of said axis of rotation (10) is included between 5 degrees in anticlockwise rotation and 25 degrees in clockwise rotation relative to a vertical direction (V), said rotation direction being referred to a left side view of an user that wears the mask (1), and said axis of rotation (10) is in a rear position relative to the user's eyes by an amount included between 20 and 40 millimetres, said screen (4) exhibiting a middle portion (4c) designed to sealingly engage the connecting sleeve (5) and substantially positioned in register with the user's mouth.
Claim 2
Dependent Claim
19 words
A mask according to claim 1, characterized in that said middle portion (4c) of the connecting sleeve projects outwardly.
Claim 3
Dependent Claim
35 words
A mask according to claim 1, characterized in that when the mask (1) is worn by the user (3) the axis of rotation (10) of said transparent screen (4) of toroidal form is substantially upright.
Claim 4
Dependent Claim
34 words
A mask according to claim 1, characterized in that said toroidal transparent screen (4) is generated by an arc of a circle the bending radius (R) of which ranges between 100 and 200 millimetres.
Claim 5
Dependent Claim
34 words
A mask according to claim 1, characterized in that the centre (C) of said arc of a circle is located under the user's eyes by an amount (h) included between 0 and 50 millimetres.
Claim 6
Dependent Claim
44 words
A mask according to claim 1, characterized in that said transparent screen (4) of toroidal form is generated by the rotation of said arc of a circle about the rotational axis (10) through an angle of rotation (β) included between 160 and 200 degrees.
Claim 7
Dependent Claim
38 words
A mask according to claim 1, characterized in that the maximum bending radius (r) of the toroidal transparent screen (4) defined in a plane perpendicular to said axis of rotation (10) is included between 75 and 108 millimetres.
Claim 8
Dependent Claim
46 words
A mask according to claim 7, characterized in that the ratio between the bending radius (R) of said arc of a circle and the maximum bending radius (r) defined in the plane perpendicular to said rotational axis (10) is greater than 1 and less than 2.5.
Claim 9
Dependent Claim
43 words
A mask according to claim 1, characterized in that the upper edge (4a) of the toroidal transparent screen (4) in a plane perpendicular to said rotational axis (10) exhibits a bending of radius (a) greater than 60 millimetres and smaller than 120 millimetres.
Claim 10
Dependent Claim
45 words
A mask according to claim 1 characterized in that the lower edge (4b) of the toroidal transparent screen (4) in a plane perpendicular to said rotational axis (10) exhibits a bending of radius (b) greater than or equal to 0 and lower than 30 millimetres.
Claim 11
Dependent Claim
40 words
A mask according to claim 1, characterized in that the distance (c) existing between the upper edge (4a) of the transparent screen (4) and the section thereof having said maximum bending radius (r) is included between 0 and 80 millimetres.
Claim 12
Dependent Claim
34 words
A mask according to claim 1, characterized in that the distance (d) existing between the upper (4a) and lower (4b) edges of the toroidal transparent screen (4) is included between 130 and 220 millimetres.
Claim 13
Dependent Claim
36 words
A mask according to claim 1, characterized in that the thickness of said transparent screen (4) is the greatest (s') in the middle of the toroidal surface and gradually decreases towards the side portions (s'') thereof.
Claim 14
Dependent Claim
60 words
A mask according to claim 1, characterized in that said transparent screen (4) is in the form of an isosceles triangle in which the base side defining the upper edge (4a) of the screen (4) is of substantially rectilinear configuration, whereas the oblique sides have a curvilinear extension, the three sides being joined to each other by wide-radius rounded portions.
Claim 15
Dependent Claim
39 words
A mask according to claim 1, characterized in that said transparent screen (4) has one hole (9c) formed in the vicinity of an upper portion of said projecting middle region (4c) and designed to sealingly receive a transmitter (9).
Claim 16
Dependent Claim
59 words
A mask according to claim 1, characterized in that said projecting middle portion (4c) has a second hole (4d) designed to be coupled to the inspiration opening (5b) through fastening means (11) carrying out the removable engagement of said connecting sleeve (5), and a third hole (4e) designed to be coupled to the expiration opening (5a) of the sleeve.
Claim 17
Dependent Claim
35 words
A mask according to claims 15 and 16, characterized in that the axes of the first, second and third holes (9c, 4d and 4e) lie in the plane of symmetry of the transparent screen (4).
Claim 18
Dependent Claim
19 words
A mask according to claim 16, characterized in that said fastening means (11) essentially consists of a bayonet coupling.
Claim 19
Dependent Claim
93 words
A mask according to claim 18, characterized in that said bayonet coupling comprises a ring nut (12) carried by the connecting sleeve (5) coaxially with said inspiration opening (5b) and provided with at least a radially-extending engaging lug (12a) defining an undercut, said lug (12a) being designed to engage, through axial fitting, into a corresponding access housing (12b) formed on the perimetrical edge of said second hole (4d) and to be locked against said perimetrical edge following an angular rotation of the connecting sleeve (5) about the axis of the inspiration opening (5b).
Claim 20
Dependent Claim
30 words
A mask according to claim 19, characterized in that said ring nut (12) has four radially-extending engaging lugs (12a) which are circumferentially distributed thereon according to angles of 90 degrees.
Claim 21
Dependent Claim
36 words
A mask according to claim 16, characterized in that operatively engaged in said expiration opening (5a) is a single-acting valve (8) previously fitted in said third hole (4e) of the transparent screen from the inside thereof.
Claim 22
Dependent Claim
25 words
A mask according to claim 21, characterized in that said single-acting valve (8) is operatively engaged in said expiration opening (5e) through a threaded coupling.
Claim 23
Dependent Claim
38 words
A mask according to claim 16, characterized in that seal rings of elastomeric material (5c, 5d) are interposed between the inspiration opening (5b) and corresponding second hole (4d) and the expiration opening (5a) and corresponding third hole (4e).
Claim 24
Dependent Claim
76 words
A mask according to claim 16, characterized in that a filtering element (13) is detachably mounted to said inspiration opening (5b), which filtering element enables the air to pass from the surrounding atmosphere to the inside of the mask (1) as a result of the vacuum produced in said mask, a single-acting valve (8) being associated with said expiration opening for enabling the air expired by the user (3) from the mask inside to be ejected.
Claim 25
Dependent Claim
62 words
A mask according to claim 16, characterized in that an air duct for delivering air under pressure to the mask inside is mounted to said inspiration opening (5b), a single-acting valve being associated with said expiration opening (5a) and being such adjusted that the ejection of air from the mask (1) is allowed when pressure within the mask exceeds a predetermined value.
Claim 26
Dependent Claim
45 words
A mask according to claim 16, characterized in that a connecting duct having a closed-circuit oxygen breathing apparatus is associated with said inspiration opening (5b), said expiration opening (5a) being hermetically isolated from the surrounding atmosphere and in fluid communication with the inspiration opening (5b).
Claim 27
Dependent Claim
37 words
A mask according to claim 1, characterized in that the ratio between the overall surface of the transparent screen (4) and the surface thereof taken up by said projecting middle portion (4c) is between 4 and 8.
References Cited (Backward Citations)
No citation records indexed.
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