Respirator filter

• US 5,619,989 A
• Filed: 03/07/1995
• Issued: 04/15/1997
• Est. Priority Date: 03/26/1994
• Status: Expired due to Fees

• Current Assignee: Dragerwerk AG
• Original Assignee: Dragerwerk AG
• Inventors: Kruger, Jens
• Primary Examiner(s): Millin, V.
• Assistant Examiner(s): Deane, Jr., William J.
• Application Number:
  US08/399,856
• Time in Patent Office: 770 Days
• Field of Search: 128/205.27, 128/205.28, 128/205.29, 128/206.18, 128/206.17, 55/521, 55/497, 55/499, 55/501, 55/475
• US Class Current: 128/206.17
• CPC Class Codes: A62B 23/02 for respirators
• CPC Class Codes: B01D 46/10 Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
• CPC Class Codes: B01D 46/521 using folded, pleated material

Abstract

A respirator filter with a pot-shaped filter housing, with a flange at the edge of the filter housing, with a flow channel passing through the filter housing with a sealing surface, with a housing cover and with a filter element located in the filter housing is to be optimized in terms of simpler manufacture. To accomplish this task, with the housing cover located at a spaced location from and in parallel to the filter housing, a distance a between the sealing surface and the corresponding part of the housing cover, on the one hand, and a distance (b) between the flange and an outer edge of the housing cover, on the other hand, are dimensioned such that distance (a) is smaller than distance (b), so that when the housing cover is being placed on the filter housing, it comes into contact first with the sealing surface and then with the flange, while the housing cover warps.

Claims

1. A respirator filter comprising:

a substantially pot-shaped filter housing including an outer wall with a flange at an outer edge thereof and an inner wall defining a flow channel passing through the filter housing, said inner wall having an outer edge defining a sealing surface;

a filter element disposed in said filter housing; and

an elastic housing cover for closing the filter housing, said housing cover having a sealing surface engaging portion and a flange engaging portion, when said housing cover is located at a spaced location from said housing parallel to said sealing surface, a distance (a) is defined between said sealing surface and said sealing surface engaging part of said housing cover and a distance (b) is defined between said flange and said flange engaging part of said housing cover, said distance (a) being smaller than said distance (b), said housing cover being placed on to said filter housing with said sealing surface engaging part engaging said sealing surface and said flange engaging part engaging said flange, to warp said housing cover, said housing cover pressing said filter element against said flange and said sealing surface, said housing having a spacer section defining an air distribution space between said filter element and said housing cover.

2. A respirator filter according to claim 1, wherein said filter element is formed as a folded ring filter, said filter element being fastened in a fold formed by pressing an outer edge of said flange engaging part of said housing cover onto said flange.

3. A respirator filter according to claim 2, wherein said fold is formed as a double fold, substantially in parallel to said outer wall of said filter, said double fold being formed in a manner to reduce said spacer section between said filter element and said housing cover.

4. A respirator filter according to claim 1, wherein said sealing surface has a semi-circular contour and said housing cover sealing surface engaging part has a shape adapted to said semi-circular contour in an area of said sealing surface.

5. A respirator filter according to claim 2, wherein said sealing surface has a semi-circular contour and said housing cover sealing surface engaging part has a shape adapted to said semi-circular contour in an area of said sealing surface.

6. A respirator filter according to claim 3, wherein said sealing surface has a semi-circular contour and said housing cover sealing surface engaging part has a shape adapted to said semi-circular contour in an area of said sealing surface.