Protection and respiratory equipment for aircraft pilot and individual user
A protection equipment including a base member with a deformable membrane which includes a central orifice with an adaptive size, configured to selectively circumvent in a substantially airtight manner the neck of the user, a hood coupled in a substantially airtight manner the base member, whereby a substantially closed volume is provided, the closed volume being delimited by the deformable membrane, the base member, the neck and the hood, and an aperture control device to change the central orifice of the deformable membrane from a large aperture state to a small aperture state.
1. A protection equipment comprising:
a base member with a deformable membrane which comprises a central orifice with an adaptive size, the adaptive size defining a large aperture state in which an adult human head is capable of passing therethrough and a small aperture state configured to selectively circumvent in a substantially airtight manner a neck of a user,
a hood coupled in a substantially airtight manner to the base member, whereby a substantially closed volume is provided, the closed volume being delimited by the deformable membrane, the base member, the neck and the hood,
an aperture control device to change the central orifice of the deformable membrane from the large aperture state to the small aperture state in which the deformable membrane circumvents in the substantially airtight manner the neck of the user,
wherein the aperture control device comprises a stationary ring, a movable ring, and at least three extensible cords, wherein the deformable membrane is formed as a sleeve, wherein a first border and a second border of the deformable membrane are attached to the stationary ring, and wherein, for each cord, a first end is attached to the stationary ring and a second end is attached to the movable ring.
2. The protection equipment according to claim 1 , wherein the central orifice of the deformable membrane in the large aperture state comprises an opened cross section of at least 300 cm 2 .
3. The protection equipment according to claim 2 , wherein there is defined a surfacic ratio L/S defined by an area of the large aperture state divided by an area of the small aperture state, where L/S is at least 4.
4. The protection equipment according to claim 1 wherein there is provided additionally a fabric collar configurable to come into contact with the neck of the user.
5. The protection equipment according to claim 4 , wherein fabric collar is detachably coupled to a radial middle portion of the deformable membrane.
6. The protection equipment according to claim 1 , wherein the at least three extensible cords are resilient and provide an elastic return to the large aperture state.
7. The protection equipment according to claim 1 , wherein the movable ring comprises a control lever, actuable manually and/or by a cable.
8. The protection equipment according to claim 1 , further comprising a rigid visor and a base frame, the rigid visor movably mounted on the base frame, between a retracted position and a use position wherein the rigid visor contacts in an airtight manner the base frame.
9. The protection equipment according to claim 8 , wherein the hood comprises an extendible canopy with one or more arches and a flexible wall, coupled in an airtight manner to an upper border of the rigid visor.
10. The protection equipment according to claim 1 , further comprising a rigid visor, wherein the aperture control device is driven by a cable link driven by the rigid visor.
11. The protection equipment according to claim 10 , further comprising a microphone and one or two loudspeakers.
12. The protection equipment according to claim 1 , further comprising a gaseous exchange through one or two gas conduits fluidly coupling the closed volume with an external or remote respirable gas supply.