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 Title: |
US4961420:
Gas mask for operation in contaminated areas
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Cappa, Giulio; Milan, Italy
Moscatelli, Romano; Rome, Italy
La Torre, Paolo; Genzano di Roma, Italy
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| Assignee: |
Industrie Pirelli S.p.A., both of, Italy
Minestero Della Difesa Direzione Generale A.M.A.T., both of, Italy
other patents from INDUSTRIE PIRELLI, S.P.A. (271415) (approx. 115)
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| Published / Filed: |
1990-10-09
/ 1989-02-24
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| Application Number: |
US1989000315469
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| IPC Code: |
Advanced:
A62B 18/02;
IPC-7:
A62B 7/10;
A62B 18/04;
A62B 18/08;
A62B 18/10;
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| ECLA Code: |
A62B18/02;
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| U.S. Class: |
Current:
128/207.12;
128/201.19;
128/206.12;
128/206.15;
128/206.17;
128/206.22;
128/206.24;
128/206.28;
Original:
128/207.12;
128/206.24;
128/206.28;
128/206.22;
128/206.12;
128/206.15;
128/206.17;
128/201.19;
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| Field of Search: |
128/201.21,201.22,201.23,201.24,201.25,201.28,201.29,202.15,206.12,206.15,206.17,206.22,206.24,206.27,206.28,207.12,201.13,201.15,201.19
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| Priority Number: |
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| Abstract: |
A gas mask is provided which includes a facepiece including a front portion of semi-rigid rubber highly resistant to chemical agents and a sealing skirting of soft rubber having a high mechanical resistance, co-vulcanized with the front portion of the facepiece. A nozzle, connected to a half mask situated inside the facepiece, is tightly fastened to the front portion of the facepiece. An inflow opening and an outflow opening are provided which are substantially coaxial and are located in the lower portion of the nozzle. The inflow opening places the interior of the facepiece into communication with the external atmosphere and the outflow opening places the interior of the half mask into communication with the external atmosphere through an inflow chamber and an outflow chamber which are separated by a partition. The inflow chamber communicates bilaterally with a space located between the half mask and the facepiece. The outflow chamber communicates with the external atmosphere, over the inflow opening, and in front of the phonic cap assembled in the upper part of the nozzle.
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| Attorney, Agent or Firm: |
Stevens, Davis, Miller & Mosher ;
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| Primary / Asst. Examiners: |
Burr, Edgar S.; Asher, Kimberly L.
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| Maintenance Status: |
E1 Expired Check current status
CC Certificate of Correction issued
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
AT BE CH DE ES FR GB GR LI LU NL SE
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| Family: |
Show 16 known family members
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First Claim:
Show all 13 claims |
We claim:
1. A gas mask for operation in contaminated areas, comprising:
- a facepiece;
- a nozzle tightly engaged in a lower portion of said facepiece and having a front portion facing toward an outer environment and a rear portion joined together with said front portion and having a width smaller than the width of said front portion, said nozzle including an inflow opening having a fitting adapted to hold a filter, said inflow opening being located in a lower portion of said nozzle;
- a half mask situated at an interior region of said facepiece, tightly engaged with said rear portion of said nozzle and provided with a terminal edge adapted to provide a seal around the user's nose and mouth, said inflow opening communicating with said interior region of said facepiece;
- connection means for enabling passage of air from said interior region of said facepiece to an interior region of said half mask;
- closing valve means for opening and closing said inflow opening;
- an outflow opening placing said interior region of said half mask into communication with the outer environment, said outflow opening being located in a lower part of said rear portion substantially at the level of and behind said inflow opening;
- a single-acting outflow valve for opening and closing said outflow opening;
- a phonic cap housed in said nozzle and situated above said inflow opening and said outflow opening;
- a communication chamber positioned within said nozzle at the level of said phonic cap and including communication holes to the outer environment;
- an inflow chamber which opens bilaterally in said lower portion of said facepiece near opposite sides of said rear portion and is positioned between said inflow opening and said interior region of said facepiece to enable said inflow opening to be in communication with said interior region of said facepiece;
- an outflow chamber positioned between said outflow opening and said communication chamber to enable said outflow opening to be in communication with the outer environment through said communication chamber, said communication chamber being located above said inflow opening and said outflow opening; and
- a partition located inside said nozzle and mutually separating said inflow chamber and said outflow chamber from each other, said partition being tightly connected with the peripheral extent of said rear partition and having a width smaller than said width of said front portion of said nozzle.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 32 U.S. patent(s) that reference this one
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