Passenger oxygen mask and breathing bag for an oxygen mask

Abstract

The invention relates to a passenger oxygen mask for the emergency supply of oxygen in an aircraft, with a breathing bag which is provided on the entry side with a tube for the oxygen supply, wherein the tube and the breathing bag consist of polyurethane. The invention further relates to a breathing bag, with which a flow indicator is integrated into the connection piece.

Claims

1. An aircraft passenger oxygen mask, comprising: a polyurethane breathing bag having an oxygen inlet and an oxygen outlet; a polyurethane spiral oxygen feed tube; a mask; and a hollow, frusto-conical connection piece attached to an exterior surface of the polyurethane breathing bag at the oxygen inlet and coupling the polyurethane spiral oxygen feed tube to an interior of the polyurethane breathing bag, the hollow, frusto-conical connection piece includes a channel having a flow indicator therein extending substantially from the polyurethane spiral oxygen feed tube to the polyurethane breathing bag and disposed external to the polyurethane breathing bag, an annular peripheral groove into which a sealing disk resides, the annular peripheral groove extending radially inward from a portion of the frusto-conical connection piece having an outer wall radius greater than an inner tube radius of the polyurethane spiral oxygen feed tube, the flow indicator extending through the portion of the frusto-conical connection piece, the frusto-conical connection piece spaces the polyurethane spiral oxygen feed tube from the portion of the frusto-conical connection piece and the polyurethane breathing bag, the sealing disk having an inner radius, a first circumferential shoulder disposed substantially within an outer surface of the frusto-conical connection piece for receiving an annular locking ring, the first circumferential shoulder defining an outer shoulder radius less than the outer wall radius of the portion of the frusto-conical connection piece, and a radially projecting surface for receiving a sealed surface of the breathing bag.

2. The aircraft passenger oxygen mask of claim 1, wherein the polyurethane breathing bag is welded to the sealing disk.

3. The aircraft passenger oxygen mask of claim 1, wherein the mask is connected to the polyurethane breathing bag via a connector.

4. The aircraft passenger oxygen mask of claim 1, wherein the polyurethane spiral oxygen feed tube is bonded to the frusto-conical connection piece.

5. The aircraft passenger oxygen mask of claim 1, comprising: the annular locking ring arranged on the first circumferential shoulder of the sealing disk and radially outward from the first circumferential shoulder of the sealing disk to press the sealing disk radially inward into the annular peripheral groove, the sealing disk spaces the annular locking ring from the polyurethane breathing bag.

6. The aircraft passenger oxygen mask of claim 1, comprising: the oxygen inlet defines an opening having an opening radius greater than the outer wall radius of the portion of the frusto-conical connection piece.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention is hereinafter explained by way of one embodiment example represented in the drawing. There are shown in:

(2) FIG. 1 is a plan view of an oxygen mask according to the state of the art,

(3) FIG. 2A is a plan view of an oxygen mask according to one embodiment of the invention,

(4) FIG. 2B is a view of the oxygen mask according to FIG. 2A, which is rotated by 90 with respect to FIG. 2A, and

(5) FIG. 3A and FIG. 3B are respective detail views of a connection piece of the oxygen mask shown in FIGS. 2A and 2B.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(6) FIG. 1 is an oxygen mask 1 which can be applied for passengers of an aircraft, according to the state of the art. The oxygen mask 1 comprises a breathing bag 2 which is manufactured of PVC and in which a pull-relief lanyard 3 for reinforcement purposes is arranged. An oxygen inlet 4 is provided on the breathing mask 2, on which inlet a sealing disk (not shown) welded to the breathing bag 2 and having a connection piece 5 for receiving a tube 6 is arranged. The tube 6 is also manufactured of PVC. A flow indicator 7 is introduced in the tube 7 and interrupts the course of the tube, by which means two further connection points or interfaces of the tube 6 arise. An outlet 8, on which a sealing disk (not represented) is likewise welded to the breathing bag 2 is located on the side of the breathing bag 2 which lies opposite the inlet 4, and this sealing disk is fastened with the connection element 9 on the mask. The connection element 9 is located in the breathing bag 2, and on connection of the breathing bag 2 to the mask body, pushes the sealing disk of the breathing bag 2 onto an envisaged sealing edge of the mask.

(7) FIGS. 2A and 2B are respective views of an oxygen mask 1 according to one embodiment of the invention, which can be applied for passengers in an aircraft, wherein FIG. 2A is a plan view of the oxygen mask 1 and FIG. 2B a lateral view of the oxygen mask 1. As also the case with the oxygen mask 1 represented in FIG. 1, the oxygen mask 1 shown here likewise comprises a breathing bag 2 with an oxygen inlet 4 and an outlet 8. The tube 6 is connected to the oxygen inlet 4 via a connection piece 5. A mask 10 is connected to the outlet via the connection element 9. In contrast to the oxygen mask 1 represented in FIG. 1, here however the breathing bag 2 and the tube 6 are manufactured of polyurethane, so that one can make do without the provision of a pull-relief lanyard 3. Furthermore, it can be recognised particularly well in FIG. 2B, that the tube 6 is designed as a spiral tube which entails the already mentioned advantages with regard to the handling of the tube 6 on packing this into the mask 10 and on ejection of the mask 10. A flow indicator 7 is integrated into the connection piece 5, so that the tube 6 is designed in a single-part manner without interruption and additional interfaces.

(8) FIG. 3A and FIG. 3B are respective detail views of a connection piece 5 of the oxygen mask 1 shown in FIG. 2A and FIG. 2B, wherein FIG. 3A is a sectioned view through the connection piece 5 and FIG. 3B is an enlarged sectioned view of a detail in the sealing region of the connection piece 5. As can be recognised in FIG. 3B, a sealing disk 11 is provided between the breathing bag 2 and the connection piece 5. The sealing disk 11 is welded to the breathing bag 2. A peripheral, groove-like recess 12 is provided in the connection piece 5, in which recess the sealing disk 11 is received. Moreover, a clamping ring 14 is arranged on a projection 15 of the sealing disk 11, in order to press the sealing disk 11 on a sealing edge 13 into the recess 12 in a fixed manner or to fix it therein. The clamping ring 14 exerts a radial clamping force on the sealing disk 11, characterised in FIG. 3B by the arrow and the letter F. The flow indicator 7 on the entry side is designed as a connection piece 5, onto which the tube 6 is stuck, as is recognisable in FIG. 3A, which permits a simplified assembly of the oxygen mask 1 and minimises the interfaces of the tube 6.

LIST OF REFERENCE NUMERALS

(9) 1oxygen mask

(10) 2breathing bag

(11) 3pull-relief lanyard

(12) 4oxygen inlet

(13) 5connection piece

(14) 6tube

(15) 7flow indicator

(16) 8outlet

(17) 9connection element

(18) 10mask

(19) 11sealing disk

(20) 12recess

(21) 13sealing edge

(22) 14clamping ring