Respirators
First Claim
1. A generally cup-shaped filtering facepiece 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 having at its larger end a peripheral free edge (4);
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12) that are interconnected by four apices (e, f, g, h), respectively, said end wall panels being connected with each other by central fold line means (8) that extend between a pair of opposite apices (g, h), thereby to define between said four interconnected fold lines a quadrilateral region having two triangular panels(2) said end wall panels being folded inwardly about said four interconnected fold lines to cause said quadrilateral region to extend reversely within said pocket at the closed end of the facepiece; and
(c) means (13,14) for attaching said facepiece to the wearer'"'"'s head.
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a respirator of the type called a filtering facepiece which is made from a flat pocket of flexible filtering sheet material having a generally tapering shape with an open edge at the larger end of the pocket and a closed end at the smaller end of the pocket. The closed end of the pocket is formed with fold lines defining a generally quadrilateral surface comprising triangular surfaces which are folded to extend inwardly of the pocket, the triangular surfaces facing each other and being, in use, relatively inclined to each other.
113 Citations
13 Claims
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1. A generally cup-shaped filtering facepiece 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 having at its larger end a peripheral free edge (4); - and
(b) end wall means (2) closing the smaller end of said side wall portion, thereby to define a pocket (1) 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 (7) foldably connected with said side wall means by four first fold lines (11,
12) that are interconnected by four apices (e, f, g, h), respectively, said end wall panels being connected with each other by central fold line means (8) that extend between a pair of opposite apices (g, h), thereby to define between said four interconnected fold lines a quadrilateral region having two triangular panels(2) said end wall panels being folded inwardly about said four interconnected fold lines to cause said quadrilateral region to extend reversely within said pocket at the closed end of the facepiece; and (c) means (13,14) for attaching said facepiece to the wearer'"'"'s head. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification