US 7,320,722 B2
Respiratory protection device that has rapid threaded clean air source attachment
William A. Mittelstadt, Woodbury, Minn. (US); and John M. Pilgrim, Woodbury, Minn. (US)
Assigned to 3M Innovative Properties Company, St. Paul, Minn. (US)
Filed on Oct. 29, 2004, as Appl. No. 10/977,076.
Prior Publication US 2006/0090754 A1, May 04, 2006
Int. Cl. B01D 46/00 (2006.01); A62B 9/04 (2006.01)
U.S. Cl. 55—505  [55/502; 55/DIG. 33; 55/DIG. 35; 128/202.27; 128/206.17] 16 Claims
OG exemplary drawing
 
1. A personal respiratory protection device that comprises:
(a) a mask body that has a first threaded portion;
(b) a clean air supply source that has a second threaded portion, the second threaded portion being adapted to mate with the first threaded portion on the mask body, wherein
(i) the first and second threaded portions engage each other at a high thread pitch;
(ii) the first and second threaded portions comprise an integral détente; and
(iii) the first and second threaded portions have a stop associated therewith, which stop prevents over-rotation of the clean air supply source relative to the mask body during securement of the clean air supply source to the mask body.