Respirators
First Claim
1. A generally cup-shaped filtering facepiece (100) formed of flexible filtering material adapted to cover the nose and mouth of a user, said facepiece comprising(a) convergent generally frusto-conical side wall means (105, 106) having at its large end a peripheral free edge (104);
- (b) end wall means (108) closing the smaller end of said side wall portion, thereby to define a pocket for receiving the nose and mouth of the user with said peripheral edge extending over the nose and under the chin of the user, said end wall means including(1) a plurality of end wall panels (108a, 108b) foldably connected with said side wall means by four first fold lines (107a, 107b) that are interconnected by four apices (X, Y, Z), respectively, said end wall panels being connected with each other by central fold line means (109a, 109b) that extend between a pair of opposite apices (X, Z), thereby to define between said four interconnected fold lines a generally pyramidical quadrilateral region (108) having four triangular panels;
(2) said end wall panels being folded inwardly about said four interconnected fold lines to cause said generally pyramidical quadrilateral region to extend reversely within said pocket at the closed end of the facepiece; and
(c) means (114) for attaching said facepiece to the wearer'"'"'s head.
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a filtering facepiece made from flexible filtering sheet material.
The facepiece is made from a flat pocket 100 of filtering sheet material having opposed side walls 105 and 106, a generally tapering shape with an open end 104 at the larger end and a closed end 101 at the smaller end. The edge of the pocket at the closed end is outwardly bowed, e.g. defined by intersecting straight lines and/or curved lines, and the closed end is provided with fold lines 107 defining a surface which is folded inwardly of the closed end of the pocket to define a generally conical inwardly extending recess 108 for rigidifying the pocket against collapse against the face of the wearer on inhalation.
141 Citations
18 Claims
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1. A generally cup-shaped filtering facepiece (100) formed of flexible filtering material adapted to cover the nose and mouth of a user, said facepiece comprising
(a) convergent generally frusto-conical side wall means (105, 106) having at its large end a peripheral free edge (104); -
(b) end wall means (108) closing the smaller end of said side wall portion, thereby to define a pocket for receiving the nose and mouth of the user with said peripheral edge extending over the nose and under the chin of the user, said end wall means including (1) a plurality of end wall panels (108a, 108b) foldably connected with said side wall means by four first fold lines (107a, 107b) that are interconnected by four apices (X, Y, Z), respectively, said end wall panels being connected with each other by central fold line means (109a, 109b) that extend between a pair of opposite apices (X, Z), thereby to define between said four interconnected fold lines a generally pyramidical quadrilateral region (108) having four triangular panels; (2) said end wall panels being folded inwardly about said four interconnected fold lines to cause said generally pyramidical quadrilateral region to extend reversely within said pocket at the closed end of the facepiece; and (c) means (114) for attaching said facepiece to the wearer'"'"'s head. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification