Respirator with a breathing filter

• US 5,515,846 A
• Filed: 06/01/1995
• Issued: 05/14/1996
• Est. Priority Date: 12/06/1994
• Status: Expired due to Term

• Current Assignee: Dragerwerk AG
• Original Assignee: Dragerwerk AG
• Inventors: Drews, Ralf
• Primary Examiner(s): Burr, Edgar S.
• Assistant Examiner(s): COLILLA, DANIEL JAMES
• Application Number:
  US08/456,505
• Time in Patent Office: 348 Days
• Field of Search: 128/201.22-201.25, 128/205.27-205.29, 128/206.12, 128/206.16, 128/206.17, 128/206.28
• US Class Current: 128/206.28
• CPC Class Codes: A62B 18/02 Masks gas-masks for animals A62B18/06; masks for welders A61F9/06

Abstract

A respirator including a mask body with a breathing filter at a breathing connection of the mask body, with a cuff accommodating the breathing filter and with a bellows, which seals the mask interior against the environment. The bellows is connected to the cuff and to the mask body. The breathing filter is locked in the position of use based on the bellows being made in one piece with the breathing connection, as a continuation of the mask body. The bellows surrounds the cuff in the manner of a truncated cone, in at least one partial section of the extent of the breathing filter.

Claims

1. A respirator, comprising:

a mask body with a mask body breathing connection, said mask body defining a mask interior;

a breathing filter, the breathing filter being disposed at the mask body breathing connection and having an axis extending centrally of said filter in the direction of air passing through said filter;

a cuff accommodating said breathing filter; and

a bellows connected to said cuff and connected to said mask body, defining a seal for sealing said mask interior against the environment, said bellows being dimensioned to extend over the entire extent of said breathing filter up to a filter inlet of said breathing filter, said bellows continuing from said filter inlet as said cuff, said bellows being folded over in a direction substantially parallel to said axis, and being formed of an elastomeric material, said bellows being made in one piece with said breathing connection, the one piece forming a continuation of said mask body, said bellows surrounding said cuff in a truncated cone-shaped manner.

2. A respirator in accordance with claim 1 wherein said breathing connection has a connection external dimension and said cuff has a cuff external dimension, said connection external dimension and said cuff external dimension being provided to define an annular gap-shaped intermediate space, whereby said bellows is accommodatable in a loop-shaped position, within said intermediate space with said breathing filter pushed into said mask interior.

3. Respirator in accordance with claim 2 wherein a protective hood is fastened to said breathing connection to provide jacketing over said bellows.

4. A respirator in accordance with claim 1 wherein a protective hood is fastened to said breathing connection to provide jacketing over said bellows.

5. Respirator in accordance with claim 4 including a filter cover, wherein said protective hood is fixed on said bellows by means of said filter cover pushed onto said bellows in an area of a filter inlet of said breathing filter.

6. A respirator in accordance with claim 1, wherein:

said bellows means has a truncated cone shape.

7. A respirator in accordance with claim 1, wherein:

said bellows means biases said filter in a position out of said mask interior.

8. A respirator in accordance with claim 1, wherein:

said filter has a filter inlet side;

said bellows means is connected to said filter at said filter inlet side, and said bellows means folds back on itself when said filter is moved into said mask interior.

9. A respirator in accordance with claim 1, wherein:

said breathing connection has an internal diameter and said filter has an external diameter to define a gap;

said bellows means folds back on itself and is positioned in said gap when said filter is moved into said mask interior.